fix mime() method

Reviewed-on: #27

Cargo.lock

@@ -23,6 +23,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "base64"
+version = "0.21.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "604178f6c5c21f02dc555784810edfb88d34ac2c73b2eae109655649ee73ce3d"
+
 [[package]]
 name = "bumpalo"
 version = "3.13.0"
@@ -41,17 +47,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
-[[package]]
-name = "chardetng"
-version = "0.1.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14b8f0b65b7b08ae3c8187e8d77174de20cb6777864c6b832d8ad365999cf1ea"
-dependencies = [
- "cfg-if",
- "encoding_rs",
- "memchr",
-]
-
 [[package]]
 name = "chrono"
 version = "0.4.26"
@@ -73,6 +68,17 @@ version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
 
+[[package]]
+name = "eml-codec"
+version = "0.1.2"
+dependencies = [
+ "base64",
+ "chrono",
+ "encoding_rs",
+ "nom",
+ "walkdir",
+]
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.32"
@@ -105,17 +111,6 @@ dependencies = [
  "cc",
 ]
 
-[[package]]
-name = "imf-codec"
-version = "0.1.0"
-dependencies = [
- "chardetng",
- "chrono",
- "encoding_rs",
- "nom",
- "walkdir",
-]
-
 [[package]]
 name = "js-sys"
 version = "0.3.63"

Cargo.toml

@@ -1,25 +1,33 @@
 [package]
-name = "imf-codec"
+name = "eml-codec"
-version = "0.1.0"
+version = "0.1.2"
 edition = "2021"
 license = "GPL-3.0-or-later"
-
+repository = "https://git.deuxfleurs.fr/Deuxfleurs/eml-codec"
+description = "Email enCOder DECoder in Rust. Support Internet Message Format and MIME (RFC 822, 5322, 2045, 2046, 2047, 2048, 2049)."
+documentation = "https://docs.rs/eml-codec"
+readme = "README.md"
+exclude = [
+    "doc/",
+    "resources/",
+]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [lib]
-name = "imf_codec"
+name = "eml_codec"
 path = "src/lib.rs"
 
 
 [[bin]]
-name = "imf_parse"
+name = "eml_parse"
 path = "src/parse.rs"
 
 [dependencies]
 nom = "7"
 chrono = "0.4"
-chardetng = "0.1"
+base64 = "0.21"
 encoding_rs = "0.8"
 
 [dev-dependencies]
 walkdir = "2"
+

LICENSE.txt

@@ -0,0 +1,674 @@
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+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
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+
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+reviewing courts shall apply local law that most closely approximates
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -1,105 +1,144 @@
-# imf-codec
+# eml-codec
 
-**Work in progress, do not use in production**
+**⚠️ This is currently only a decoder (ie. a parser), encoding is not yet implemented.**
-**This is currently only a decoder (parser), encoding is not supported.**
+
+`eml-codec` is a child project of [Aerogramme](https://aerogramme.deuxfleurs.fr), a distributed and encrypted IMAP server developped by the non-profit organization [Deuxfleurs](https://deuxfleurs.fr).
+Its aim is to be a swiss army knife to handle emails, whether it is to build an IMAP/JMAP server, a mail filter (like an antispam), or a mail client.
+
+## Example
+
+```rust
+let input = br#"Date: 7 Mar 2023 08:00:00 +0200
+From: deuxfleurs@example.com
+To: someone_else@example.com
+Subject: An RFC 822 formatted message
+MIME-Version: 1.0
+Content-Type: text/plain; charset=us-ascii
+
+This is the plain text body of the message. Note the blank line
+between the header information and the body of the message."#;
+
+let (_, email) = eml_codec::parse_message(input).unwrap();
+println!(
+    "{} just sent you an email with subject \"{}\"",
+    email.imf.from[0].to_string(),
+    email.imf.subject.unwrap().to_string(),
+);
+```
+
+[See more examples in the examples/ folder](./examples/)
+
+## About the name
+
+This library does not aim at implementing a specific RFC, but to be a swiss-army knife to decode and encode ("codec") what is generaly considered an email (generally abbreviated "eml"), hence the name: **eml-codec**.
 
 ## Goals
 
- - Correctness: do no deviate from the RFC, support edge and obsolete cases
+- Maintainability - modifying the code does not create regression and is possible for someone exterior to the project.
- - Straightforward/maintainable: implement the RFCs as close as possible, minimizing the amount of clever tricks and optimizations
+- Compatibility - always try to parse something, do not panic or return an error.
- - Multiple syntax: Write the parser so it's easy to alternate between the strict and obsolete/compatible syntax
+- Exhaustivity - serve as a common project to encode knowledge about emails (existing mime types, existing headers, etc.).
- - Never fail: Provide as many fallbacks as possible
+- Type safe - do not manipulate only strings/bytes but leverage Rust type system instead so you benefit from its safety checks at compile time.
 
-## Non goals
+[See more about this library goals in the doc/ folder](./doc/goals.md)
-
-  - Parsing optimization (greedy parser, etc.) as it would require to significantly deviate from the RFC ABNF syntax (would consider this case if we could prove that the transformation we make are equivalent)
-  - Pipelining/streaming/buffering as the parser can arbitrarily backtrack + our result contains reference to the whole buffer, imf-codec must keep the whole buffer in memory. Avoiding the sequential approach would certainly speed-up a little bit the parsing, but it's too much work to implement currently.
-  - Zerocopy. It might be implementable in the future, but to quickly bootstrap this project, I avoided it for now.
 
 ## Missing / known bugs
 
 Current known limitations/bugs:
 
+ - **Part transfer-decoding is not implemented yet**
+ - **Internationalized headers (UTF-8) is not implemented yet**
  - Resent Header Fields are not implemented
  - Return-Path/Received headers might be hard to use as their order is important, and it's currently lost in the final datastructure.
  - Datetime parsing of invalid date might return `None` instead of falling back to the `bad_body` field
- - Comments are dropped
+ - Comments contained in the email headers are dropped during parsing
+ - No support is provided for message/external-body (read data from local computer) and message/partial (aggregate multiple fragmented emails) as they seem obsolete and dangerous to implement.
 
 ## Design
 
-Based on nom, a parser combinator lib in Rust.
+High-level overview of the datastructures (inspired by the UML class diagram conventions):
-multipass parser
- - extract header block: `&[u8]` (find \r\n\r\n OR \n\n OR \r\r OR \r\n)
- - decode/convert it with chardet + encoding\_rs to support latin-1: Cow<&str>
- - extract header lines iter::&str (requires only to search for FWS + obs\_CRLF)
- - extract header names iter::Name::From(&str)
- - extract header body iter::Body::From(Vec<MailboxRef>)
- - extract header section Section
 
-recovery
+![Diagram of class made on Draw.io](./doc/class-uml.png)
- - based on multipass, equivalent to sentinel / synchronization tokens
 
 ## Testing strategy
 
-imf-codec aims to be as much tested as possible against reald
+Currently this crate has some unit tests on most of its parsing functions.
+It is also tested as part of Aerogramme, its parent project where it handles email parsing.
+In this project,  `eml-codec` parsing capabilities are compared to Dovecot, Cyrus, Maddy and other IMAP servers.
 
-### Unit testing: parser combinator independently (done)
+It is planned to test it on large email datasets (like Enron, jpbush, mailing lists, etc.) but it's not done yet.
+Fuzzing the library would also be interesting, probably to detect crashing due to stack overflow for example
+due to the infinite recursivity of MIME.
 
-### Selected full emails (expected)
+## RFC and IANA references
 
-### Existing datasets
+RFC
-
-**Enron 500k** - Took 20 minutes to parse ~517k emails and check that 
-RFC5322 headers (From, To, Cc, etc.) are correctly parsed.
-From this list, we had to exclude ~50 emails on which
-the From/To/Cc fields were simply completely wrong, but while
-some fields failed to parse, the parser did not crash and
-parsed the other fields of the email correctly.
-
-Run it on your machine:
-
-```bash
-cargo test -- --ignored --nocapture enron500k
-```
-
-Planned: jpbush, my inbox, etc.
-
-### Fuzzing (expected)
-
-### Across reference IMAP servers (dovevot, cyrus) (expected)
-
-## Development status
-
-Early development. Not ready.
-Do not use it in production or any software at all.
-
-Todo:
- - [X] test over the enron dataset
- - [ ] convert to multipass parser
- - [ ] implement mime part 3 (encoded headers)
- - [ ] implement mime part 1 (new headers)
- - [ ] review part 2 (media types) and part 4 (registration procedure) but might be out of scope
- - [ ] implement some targeted testing as part of mime part 5
- - [ ] implement fuzzing through cargo fuzz
- - [ ] test over other datasets (jpbush, ml, my inbox)
- - [ ] backport to aerogramme
- - [ ] fix warnings, put examples, document the public API a little bit
-
-## Targeted RFC
 
 | 🚩 | # | Name |
 |----|---|------|
 | 🟩 |822	| ARPA INTERNET TEXT MESSAGES| 
 | 🟩 |2822	| Internet Message Format (2001) | 	
 | 🟩 |5322	| Internet Message Format (2008) | 	
-| 🔴 |2045	| ↳ Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies |
+| 🟩 |2045	| ↳ Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies |
-| 🔴 |2046	| ↳ Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types | 
+| 🟩 |2046	| ↳ Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types | 
-| 🔴 |2047	| ↳ MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text | 
+| 🟩 |2047	| ↳ MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text | 
-| 🔴 |2048	| ↳ Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures | 
+| 🟩 |2048	| ↳ Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures | 
-| 🔴 |2049	| ↳ Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples |
+| 🟩 |2049	| ↳ Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples |
-| 🟩 |6532	| Internationalized Email Headers |
+|    |      | **Headers extensions** |
-| 🔴 |9228   | Delivered-To Email Header Field |
+| 🔴 |2183  | ↳ Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field |
+| 🔴 |6532	| ↳ Internationalized Email Headers |
+| 🔴 |9228  | ↳ Delivered-To Email Header Field |
+|    |      | **MIME extensions** |
+| 🔴 |1847  | ↳ Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted |
+| 🔴 |2387  | ↳ The MIME Multipart/Related Content-type |
+| 🔴 |3462  | ↳ The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages |
+| 🔴 |3798  | ↳ Message Disposition Notification |
+| 🔴 |6838  | ↳ Media Type Specifications and Registration Procedures |
 
-## Alternatives
+IANA
 
-`stalwartlab/mail_parser`
+| Name | Description | Note |
+|------|-------------|------|
+| [Media Types](https://www.iana.org/assignments/media-types/media-types.xhtml) | Registered media types for the Content-Type field | Currently only the media types in the MIME RFC have dedicated support in `eml-codec`. |
+| [Character sets](https://www.iana.org/assignments/character-sets/character-sets.xhtml) | Supported character sets for the `charset` parameter | They should all be supported through the `encoding_rs` crate |
+
+## State of the art / alternatives
+
+The following review is not an objective, neutral, impartial review. Instead, it's a temptative 
+to explain why I wrote this library. If you find something outdated or objectively wrong, feel free to open a PR or an issue to fix it.
+In no case, I think `eml-codec` is superior, it's just another approach to the problem, and I see it as another stone to the edifice.
+
+[mail\_parser](https://github.com/stalwartlabs/mail-parser), [mailparse](https://github.com/staktrace/mailparse) and [rust-email](https://github.com/deltachat/rust-email) 
+are 3 handwritten parsers. Such handwritten parsers do not encourage separation of concerns: `mail_parser` and `mailparse` feature large functions with hundreds of lines
+with a high cylomatic complexity. Due to this complex logic, I have failed to debug/patch such code in the past. 
+`rust-email` code is easier to read but its mime part implementation is marked as unstable. `mail_parser` is used in the IMAP/JMAP/SMTP server project [stalwartlabs/mail-server](https://github.com/stalwartlabs/mail-server) and `rust-email` is used in the email-based chat application [Deltachat](https://github.com/deltachat) (however `rust-email` MIME parsed is not used, a custom MIME parser is reimplemented in Delta Chat instead). It must be noted that `mail_parser` supports a large amount of extensions (UTF-8 headers, UTF-7 encoding, continuation, many custom fields, etc.) and would better cope with malformed emails than other libraries. **A goal of `eml_codec` is to be open to contribution and maintainable over time, which is made possible trough the parser combinator pattern that encourages writing small, reusable, independently testable functions.**
+
+[rustyknife](https://github.com/jothan/rustyknife) uses the same design pattern (parser combinator) and the same library ([nom](https://github.com/rust-bakery/nom)) as `eml_codec`. However, `rustyknife` is more targeted to SMTP servers (MTA) than IMAP (MDA) and email clients (MUA).
+It thus only supports parsing headers and not emails' body. Also, an acquaintance warned me that this library is a bit slow,
+it might be due to the fact that the library does some processing while parsing the email (like rebuilding and allocating strings).
+If it happens that this part is not used later, the allocation/processing has been wasted.
+**A goal of `eml_codec` is to produce an AST of the email with as few processing as possible, so that the parsing remains efficient,
+and then the allocation/processing is made lazily, on demand, when the corresponding function is called. It is often referred as zero-copy.**
+ 
+## Support
+
+`eml-codec`, as part of the [Aerogramme project](https://nlnet.nl/project/Aerogramme/), was funded through the NGI Assure Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 957073.
+
+![NLnet logo](https://aerogramme.deuxfleurs.fr/images/nlnet.svg)
+
+## License
+
+eml-codec
+Copyright (C)  The eml-codec Contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.

doc/goals.md

@@ -0,0 +1,14 @@
+## Goals
+
+- Maintainability - modifying the code does not create regression and is possible for someone exterior to the project. Keep cyclomatic complexity low.
+- Composability - build your own parser by picking the relevant passes, avoid work that is not needed.
+- Compatibility - always try to parse something, do not panic or return an error.
+- Exhaustivity - serve as a common project to encode knowledge about emails (existing mime types, existing headers, etc.).
+
+## Non goals
+
+  - Parsing optimization that would make more complicated to understand the logic.
+  - Optimization for a specific use case, to the detriment of other use cases.
+  - Pipelining/streaming/buffering as the parser can arbitrarily backtrack + our result contains reference to the whole buffer, eml-codec must keep the whole buffer in memory. Avoiding the sequential approach would certainly speed-up a little bit the parsing, but it's too much work to implement currently.
+
+

examples/simple.rs

@@ -0,0 +1,27 @@
+pub fn main() {
+    let input = br#"Date: 7 Mar 2023 08:00:00 +0200
+From: deuxfleurs@example.com
+To: someone_else@example.com
+Subject: An RFC 822 formatted message
+MIME-Version: 1.0
+Content-Type: text/plain; charset=us-ascii
+
+This is the plain text body of the message. Note the blank line
+between the header information and the body of the message."#;
+
+    // if you are only interested in email metadata/headers
+    let (_, imf) = eml_codec::parse_imf(input).unwrap();
+    println!(
+        "{} just sent you an email with subject \"{}\"",
+        imf.from[0].to_string(),
+        imf.subject.unwrap().to_string(),
+    );
+
+    // if you like to also parse the body/content
+    let (_, email) = eml_codec::parse_message(input).unwrap();
+    println!(
+        "{} raw message is:\n{}",
+        email.imf.from[0].to_string(),
+        String::from_utf8_lossy(email.child.as_text().unwrap().body),
+    );
+}

notes.md

@@ -1,8 +0,0 @@
-Test enron files:
-
-```
-cd resources/enron
-./restore.sh
-cd -
-(set -euo pipefail; find resources/enron/maildir/ -type f | while read f; do echo $f; ./target/debug/imf_parse < $f > /dev/null; done)
-```

resources/dxflrs/0005_mail-parser-readme.eml

@@ -1,5 +1,5 @@
 From: Art Vandelay <art@vandelay.com> (Vandelay Industries)
-To: "Colleagues": "James Smythe" <james@vandelay.com>; Friends:
+To: "Colleagues": "James Smythe" <james@vandelay.com>;, Friends:
     jane@example.com, =?UTF-8?Q?John_Sm=C3=AEth?= <john@example.com>;
 Date: Sat, 20 Nov 2021 14:22:01 -0800
 Subject: Why not both importing AND exporting?

rfc822.eml

@@ -1,6 +0,0 @@
-From: someone@example.com
-To: someone_else@example.com
-Subject: An RFC 822 formatted message
-
-This is the plain text body of the message. Note the blank line
-between the header information and the body of the message.

src/error.rs

@@ -1,7 +0,0 @@
-use nom;
-
-#[derive(Debug, PartialEq)]
-pub enum IMFError<'a> {
-    Segment(nom::Err<nom::error::Error<&'a [u8]>>),
-    ExtractFields(nom::Err<nom::error::Error<&'a str>>),
-}

src/fragments/address.rs

@@ -1,124 +0,0 @@
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::tag,
-    combinator::{into, opt, map_res},
-    multi::separated_list1,
-    sequence::tuple,
-};
-
-use crate::fragments::model::{GroupRef, AddressRef, MailboxRef};
-use crate::fragments::mailbox::{addr_spec, mailbox};
-use crate::fragments::misc_token::phrase;
-use crate::fragments::whitespace::{cfws};
-
-/// Address (section 3.4 of RFC5322)
-///
-/// ```abnf
-///    address         =   mailbox / group
-/// ```
-pub fn address(input: &str) -> IResult<&str, AddressRef> {
-    alt((into(mailbox), into(group)))(input)
-}
-
-/// Group
-///
-/// ```abnf
-///    group           =   display-name ":" [group-list] ";" [CFWS]
-///    display-name    =   phrase
-/// ```
-pub fn group(input: &str) -> IResult<&str, GroupRef> {
-    let (input, (grp_name, _, grp_list, _, _)) = 
-        tuple((phrase, tag(":"), opt(group_list), tag(";"), opt(cfws)))(input)?;
-
-    Ok((input, GroupRef {
-        name: grp_name,
-        participants: grp_list.unwrap_or(vec![]),
-    }))
-}
-
-/// Group list
-///
-/// ```abnf
-///    group-list      =   mailbox-list / CFWS / obs-group-list
-/// ```
-pub fn group_list(input: &str) -> IResult<&str, Vec<MailboxRef>> {
-    alt((mailbox_list, mailbox_cfws))(input)
-}
-
-fn mailbox_cfws(input: &str) -> IResult<&str, Vec<MailboxRef>> {
-    let (input, _) = cfws(input)?;
-    Ok((input, vec![]))
-}
-
-/// Mailbox list
-///
-/// ```abnf
-///    mailbox-list    =   (mailbox *("," mailbox)) / obs-mbox-list
-/// ```
-pub fn mailbox_list(input: &str) -> IResult<&str, Vec<MailboxRef>> {
-    separated_list1(tag(","), mailbox)(input)
-}
-
-/// Address list
-///
-/// ```abnf
-///   address-list    =   (address *("," address)) / obs-addr-list
-/// ```
-pub fn address_list(input: &str) -> IResult<&str, Vec<AddressRef>> {
-    separated_list1(tag(","), address)(input)
-}
-
-pub fn address_list_cfws(input: &str) -> IResult<&str, Vec<AddressRef>> {
-    let (input, _) = cfws(input)?;
-    Ok((input, vec![]))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::fragments::model::AddrSpec;
-
-    #[test]
-    fn test_mailbox_list() {
-        match mailbox_list(r#"Pete(A nice \) chap) <pete(his account)@silly.test(his host)>"#) {
-            Ok(("", _)) => (),
-            _ => panic!(),
-        };
-
-        match mailbox_list(r#"Mary Smith <mary@x.test>, jdoe@example.org, Who? <one@y.test>, <boss@nil.test>, "Giant; \"Big\" Box" <sysservices@example.net>"#) {
-            Ok(("", _)) => (),
-            _ => panic!(),
-        };
-    }
-
-    #[test]
-    fn test_address_list() {
-        assert_eq!(
-            address_list(r#"A Group:Ed Jones <c@a.test>,joe@where.test,John <jdoe@one.test>;, Mary Smith <mary@x.test>"#),
-            Ok(("", vec![
-                AddressRef::Many(GroupRef { 
-                    name: "A Group".to_string(), 
-                    participants: vec![
-                        MailboxRef {
-                            name: Some("Ed Jones".into()),
-                            addrspec: AddrSpec { local_part: "c".into(), domain: "a.test".into() },
-                        },
-                        MailboxRef {
-                            name: None,
-                            addrspec: AddrSpec { local_part: "joe".into(), domain: "where.test".into() },
-                        },
-                        MailboxRef {
-                            name: Some("John".into()),
-                            addrspec: AddrSpec { local_part: "jdoe".into(), domain: "one.test".into() },
-                        },
-                    ],
-                }),
-                AddressRef::Single(MailboxRef { 
-                    name: Some("Mary Smith".into()),
-                    addrspec: AddrSpec { local_part: "mary".into(), domain: "x.test".into() },
-                }),
-            ]))
-        );
-    }
-}

src/fragments/datetime.rs

@@ -1,393 +0,0 @@
-use chrono::{DateTime, FixedOffset, NaiveDate, NaiveTime, TimeZone};
-use nom::{
-    IResult,
-    AsChar,
-    branch::alt,
-    bytes::complete::{tag, tag_no_case, take_while, take_while1, take_while_m_n, is_a},
-    character,
-    character::is_digit,
-    character::complete::{one_of, alphanumeric1, digit0},
-    combinator::{map, opt, value},
-    sequence::{preceded, terminated, tuple, delimited },
-};
-use crate::fragments::misc_token;
-use crate::fragments::whitespace::{fws, cfws};
-
-const MIN: i32 = 60;
-const HOUR: i32 = 60 * MIN;
-
-/// Read datetime
-///
-/// ```abnf
-/// date-time       =   [ day-of-week "," ] date time [CFWS]
-/// time            =   time-of-day zone
-/// ```
-///
-/// ## @FIXME - known bugs
-///  
-///   - if chrono fails, Option::None is silently returned instead of failing the parser
-///   - `-0000` means NaiveDateTime, a date without a timezone
-/// while this library interprets it as +0000 aka UTC.
-///   - Obsolete military zones should be considered as NaiveTime
-/// due to an error in RFC0822 but are interpreted as their respective
-/// timezone according to the RFC5322 definition
-pub fn section(input: &str) -> IResult<&str, Option<DateTime<FixedOffset>>> {
-    map(terminated(
-            alt((
-                tuple((opt(terminated(strict_day_of_week, tag(","))), strict_date, strict_time_of_day, strict_zone )),
-                tuple((opt(terminated(obs_day_of_week, tag(","))), obs_date, obs_time_of_day, alt((strict_zone, obs_zone)) )),
-            )),
-            opt(cfws)
-        ), |res| {
-            match res {
-                (_, Some(date), Some(time), Some(tz)) => {
-                    date.and_time(time).and_local_timezone(tz).earliest()
-                },
-                _ => None,
-            }
-        })(input)
-}
-
-///    day-of-week     =   ([FWS] day-name) / obs-day-of-week
-fn strict_day_of_week(input: &str) -> IResult<&str, &str> {
-    preceded(opt(fws), day_name)(input)
-}
-
-///    obs-day-of-week =   [CFWS] day-name [CFWS]
-fn obs_day_of_week(input: &str) -> IResult<&str, &str> {
-    delimited(opt(cfws), day_name, opt(cfws))(input)
-}
-
-///   day-name        =   "Mon" / "Tue" / "Wed" / "Thu" /
-///                       "Fri" / "Sat" / "Sun"
-fn day_name(input: &str) -> IResult<&str, &str> {
-    alt((
-        tag_no_case("Mon"),
-        tag_no_case("Tue"),
-        tag_no_case("Wed"),
-        tag_no_case("Thu"),
-        tag_no_case("Fri"),
-        tag_no_case("Sat"),
-        tag_no_case("Sun"),
-    ))(input)
-}
-
-///    date            =   day month year
-fn strict_date(input: &str) -> IResult<&str, Option<NaiveDate>> {
-   map(
-       tuple((strict_day, month, strict_year)),
-       |(d, m, y)| NaiveDate::from_ymd_opt(y, m, d)
-    )(input)
-}
-
-///    date            =   day month year
-fn obs_date(input: &str) -> IResult<&str, Option<NaiveDate>> {
-   map(
-       tuple((obs_day, month, obs_year)),
-       |(d, m, y)| NaiveDate::from_ymd_opt(y, m, d)
-    )(input)
-}
-
-///    day             =   ([FWS] 1*2DIGIT FWS) / obs-day
-fn strict_day(input: &str) -> IResult<&str, u32> {
-    delimited(opt(fws), character::complete::u32, fws)(input)
-}
-
-///    obs-day         =   [CFWS] 1*2DIGIT [CFWS]
-fn obs_day(input: &str) -> IResult<&str, u32> {
-    delimited(opt(cfws), character::complete::u32, opt(cfws))(input)
-}
-
-///  month           =   "Jan" / "Feb" / "Mar" / "Apr" /
-///                      "May" / "Jun" / "Jul" / "Aug" /
-///                      "Sep" / "Oct" / "Nov" / "Dec"
-fn month(input: &str) -> IResult<&str, u32> {
-    alt((
-        value(1, tag_no_case("Jan")),
-        value(2, tag_no_case("Feb")),
-        value(3, tag_no_case("Mar")),
-        value(4, tag_no_case("Apr")),
-        value(5, tag_no_case("May")),
-        value(6, tag_no_case("Jun")),
-        value(7, tag_no_case("Jul")),
-        value(8, tag_no_case("Aug")),
-        value(9, tag_no_case("Sep")),
-        value(10, tag_no_case("Oct")),
-        value(11, tag_no_case("Nov")),
-        value(12, tag_no_case("Dec")),
-    ))(input)
-}
-
-///   year            =   (FWS 4*DIGIT FWS) / obs-year
-fn strict_year(input: &str) -> IResult<&str, i32> {
-    delimited(
-        fws, 
-        map(
-            terminated(take_while_m_n(4,9,|c| c >= '\x30' && c <= '\x39'), digit0), 
-            |d: &str| d.parse::<i32>().unwrap()), 
-        fws,
-    )(input)
-}
-
-///   obs-year        =   [CFWS] 2*DIGIT [CFWS]
-fn obs_year(input: &str) -> IResult<&str, i32> {
-    map(delimited(
-        opt(cfws), 
-        terminated(take_while_m_n(2,7,|c| c >= '\x30' && c <= '\x39'), digit0), 
-        opt(cfws)
-    ), |cap: &str| {
-        let d = cap.parse::<i32>().unwrap();
-        if d >= 0 && d <= 49 {
-            2000 + d
-        } else if d >= 50 && d <= 999 {
-            1900 + d
-        } else {
-            d
-        }
-    })(input)
-}
-
-///   time-of-day     =   hour ":" minute [ ":" second ]
-fn strict_time_of_day(input: &str) -> IResult<&str, Option<NaiveTime>> {
-    map(
-        tuple((strict_time_digit, tag(":"), strict_time_digit, opt(preceded(tag(":"), strict_time_digit)))),
-        |(hour, _, minute, maybe_sec)| NaiveTime::from_hms_opt(hour, minute, maybe_sec.unwrap_or(0)),
-    )(input)
-}
-
-///   time-of-day     =   hour ":" minute [ ":" second ]
-fn obs_time_of_day(input: &str) -> IResult<&str, Option<NaiveTime>> {
-    map(
-        tuple((obs_time_digit, tag(":"), obs_time_digit, opt(preceded(tag(":"), obs_time_digit)))),
-        |(hour, _, minute, maybe_sec)| NaiveTime::from_hms_opt(hour, minute, maybe_sec.unwrap_or(0)),
-    )(input)
-}
-
-fn strict_time_digit(input: &str) -> IResult<&str, u32> {
-    character::complete::u32(input)
-}
-
-fn obs_time_digit(input: &str) -> IResult<&str, u32> {
-    delimited(opt(cfws), character::complete::u32, opt(cfws))(input)
-}
-
-/// Obsolete zones
-///
-/// ```abnf
-///   zone            =   (FWS ( "+" / "-" ) 4DIGIT) / (FWS obs-zone)
-/// ```
-fn strict_zone(input: &str) -> IResult<&str, Option<FixedOffset>> {
-    map(
-        tuple((opt(fws), is_a("+-"), take_while_m_n(2,2,|c| c >= '\x30' && c <= '\x39'), take_while_m_n(2,2,|c| c >= '\x30' && c <= '\x39'))),
-        |(_, op, dig_zone_hour, dig_zone_min)| {
-            let zone_hour = dig_zone_hour.parse::<i32>().unwrap() * HOUR;
-            let zone_min = dig_zone_min.parse::<i32>().unwrap() * MIN;
-            match op {
-                "+" => FixedOffset::east_opt(zone_hour + zone_min),
-                "-" => FixedOffset::west_opt(zone_hour + zone_min),
-                _ => unreachable!(),             }
-        }
-    )(input)
-}
-
-/// obsole zone
-///
-///   obs-zone        =   "UT" / "GMT" /     ; Universal Time
-///                                          ; North American UT
-///                                          ; offsets
-///                       "EST" / "EDT" /    ; Eastern:  - 5/ - 4
-///                       "CST" / "CDT" /    ; Central:  - 6/ - 5
-///                       "MST" / "MDT" /    ; Mountain: - 7/ - 6
-///                       "PST" / "PDT" /    ; Pacific:  - 8/ - 7
-///                                          ;
-///                       %d65-73 /          ; Military zones - "A"
-///                       %d75-90 /          ; through "I" and "K"
-///                       %d97-105 /         ; through "Z", both
-///                       %d107-122 /        ; upper and lower case
-///                                          ;
-///                       1*(ALPHA / DIGIT)  ; Unknown legacy timezones 
-fn obs_zone(input: &str) -> IResult<&str, Option<FixedOffset>> {
-    // The writing of this function is volontarily verbose
-    // to keep it straightforward to understand.
-    // @FIXME: Could return a TimeZone and not an Option<TimeZone>
-    // as it could be determined at compile time if values are correct
-    // and panic at this time if not. But not sure how to do it without unwrap.
-    preceded(
-        opt(fws),
-        alt((
-            // Legacy UTC/GMT
-            value(FixedOffset::west_opt(0 * HOUR), alt((tag("UTC"), tag("UT"), tag("GMT")))),
-
-            // USA Timezones
-            value(FixedOffset::west_opt(4 * HOUR), tag("EDT")),
-            value(FixedOffset::west_opt(5 * HOUR), alt((tag("EST"), tag("CDT")))),
-            value(FixedOffset::west_opt(6 * HOUR), alt((tag("CST"), tag("MDT")))),
-            value(FixedOffset::west_opt(7 * HOUR), alt((tag("MST"), tag("PDT")))),
-            value(FixedOffset::west_opt(8 * HOUR), tag("PST")),
-
-            // Military Timezone UTC
-            value(FixedOffset::west_opt(0 * HOUR), tag("Z")),
-
-            // Military Timezones East
-            map(one_of("ABCDEFGHIKLMabcdefghiklm"), |c| match c {
-                'A' | 'a' => FixedOffset::east_opt(1 * HOUR),
-                'B' | 'b' => FixedOffset::east_opt(2 * HOUR),
-                'C' | 'c' => FixedOffset::east_opt(3 * HOUR),
-                'D' | 'd' => FixedOffset::east_opt(4 * HOUR),
-                'E' | 'e' => FixedOffset::east_opt(5 * HOUR),
-                'F' | 'f' => FixedOffset::east_opt(6 * HOUR),
-                'G' | 'g' => FixedOffset::east_opt(7 * HOUR),
-                'H' | 'h' => FixedOffset::east_opt(8 * HOUR),
-                'I' | 'i' => FixedOffset::east_opt(9 * HOUR),
-                'K' | 'k' => FixedOffset::east_opt(10 * HOUR),
-                'L' | 'l' => FixedOffset::east_opt(11 * HOUR),
-                'M' | 'm' => FixedOffset::east_opt(12 * HOUR),
-                _ => unreachable!(),
-            }),
-
-            // Military Timezones West
-            map(one_of("nopqrstuvwxyNOPQRSTUVWXY"), |c| match c {
-                'N' | 'n' => FixedOffset::west_opt(1 * HOUR),
-                'O' | 'o' => FixedOffset::west_opt(2 * HOUR),
-                'P' | 'p' => FixedOffset::west_opt(3 * HOUR),
-                'Q' | 'q' => FixedOffset::west_opt(4 * HOUR),
-                'R' | 'r' => FixedOffset::west_opt(5 * HOUR),
-                'S' | 's' => FixedOffset::west_opt(6 * HOUR),
-                'T' | 't' => FixedOffset::west_opt(7 * HOUR),
-                'U' | 'u' => FixedOffset::west_opt(8 * HOUR),
-                'V' | 'v' => FixedOffset::west_opt(9 * HOUR),
-                'W' | 'w' => FixedOffset::west_opt(10 * HOUR),
-                'X' | 'x' => FixedOffset::west_opt(11 * HOUR),
-                'Y' | 'y' => FixedOffset::west_opt(12 * HOUR),
-                _ => unreachable!(),
-            }),
-
-            // Unknown timezone
-            value(FixedOffset::west_opt(0 * HOUR), alphanumeric1),
-        )),
-    )(input)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    
-    #[test]
-    fn test_section_rfc_strict() {
-        assert_eq!(
-            section("Fri, 21 Nov 1997 09:55:06 -0600"), 
-            Ok(("", Some(FixedOffset::west_opt(6 * HOUR).unwrap().with_ymd_and_hms(1997, 11, 21, 9, 55, 6).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_received() {
-        assert_eq!(
-            section("Sun, 18 Jun 2023 15:39:08 +0200 (CEST)"),
-            Ok(("", Some(FixedOffset::east_opt(2 * HOUR).unwrap().with_ymd_and_hms(2023, 6, 18, 15, 39, 8).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_rfc_ws() {
-        assert_eq!(
-            section(
-                r#"Thu,
-         13
-           Feb
-             1969
-         23:32
-                  -0330 (Newfoundland Time)"#),
-            Ok(("", Some(FixedOffset::west_opt(3 * HOUR + 30 * MIN).unwrap().with_ymd_and_hms(1969, 2, 13, 23, 32, 00).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_rfc_obs() {
-        assert_eq!(
-            section("21 Nov 97 09:55:06 GMT"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(1997, 11, 21, 9, 55, 6).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_3digit_year() {
-        assert_eq!(
-            section("21 Nov 103 09:55:06 UT"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2003, 11, 21, 9, 55, 6).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_rfc_obs_ws() {
-        assert_eq!(
-            section("Fri, 21 Nov 1997 09(comment):   55  :  06 -0600"),
-            Ok(("", Some(FixedOffset::west_opt(6 * HOUR).unwrap().with_ymd_and_hms(1997, 11, 21, 9, 55, 6).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_2digit_year() {
-        assert_eq!(
-            section("21 Nov 23 09:55:06Z"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 9, 55, 6).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_military_zone_east() {
-        ["a", "B", "c", "D", "e", "F", "g", "H", "i", "K", "l", "M"].iter().enumerate().for_each(|(i, x)| {
-            assert_eq!(
-                section(format!("1 Jan 22 08:00:00 {}", x).as_str()),
-                Ok(("", Some(FixedOffset::east_opt((i as i32 + 1) * HOUR).unwrap().with_ymd_and_hms(2022, 01, 01, 8, 0, 0).unwrap())))
-            );
-        });
-    }
-
-    #[test]
-    fn test_section_military_zone_west() {
-        ["N", "O", "P", "q", "r", "s", "T", "U", "V", "w", "x", "y"].iter().enumerate().for_each(|(i, x)| {
-            assert_eq!(
-                section(format!("1 Jan 22 08:00:00 {}", x).as_str()),
-                Ok(("", Some(FixedOffset::west_opt((i as i32 + 1) * HOUR).unwrap().with_ymd_and_hms(2022, 01, 01, 8, 0, 0).unwrap())))
-            );
-        });
-    }
-
-    #[test]
-    fn test_section_gmt() {
-        assert_eq!(
-            section("21 Nov 2023 07:07:07 +0000"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 7, 7, 7).unwrap()))),
-        );
-        assert_eq!(
-            section("21 Nov 2023 07:07:07 -0000"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 7, 7, 7).unwrap()))),
-        );
-        assert_eq!(
-            section("21 Nov 2023 07:07:07 Z"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 7, 7, 7).unwrap()))),
-        );
-        assert_eq!(
-            section("21 Nov 2023 07:07:07 GMT"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 7, 7, 7).unwrap()))),
-        );
-        assert_eq!(
-            section("21 Nov 2023 07:07:07 UT"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 7, 7, 7).unwrap()))),
-        );
-        assert_eq!(
-            section("21 Nov 2023 07:07:07 UTC"),
-            Ok(("", Some(FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2023, 11, 21, 7, 7, 7).unwrap()))),
-        );
-    }
-
-    #[test]
-    fn test_section_usa() {
-        assert_eq!(
-            section("21 Nov 2023 4:4:4 CST"),
-            Ok(("", Some(FixedOffset::west_opt(6 * HOUR).unwrap().with_ymd_and_hms(2023, 11, 21, 4, 4, 4).unwrap()))),
-        );
-    }
-}

src/fragments/header.rs

@@ -1,650 +0,0 @@
-use std::borrow::Cow;
-use chrono::{DateTime, FixedOffset};
-use nom::{
-    IResult,
-    Parser,
-    branch::alt,
-    bytes::complete::{is_not, take_while1, take_while, tag, tag_no_case},
-    character::complete::space0,
-    combinator::{map, opt, recognize},
-    multi::{many0, many1, fold_many0, separated_list1},
-    sequence::{terminated, preceded, pair, tuple},
-};
-
-use chardetng::EncodingDetector;
-use encoding_rs::Encoding;
-
-use crate::fragments::whitespace::{fws, perm_crlf};
-use crate::fragments::words::vchar_seq;
-use crate::fragments::misc_token::{phrase, unstructured};
-use crate::fragments::model::{HeaderSection, MailboxRef, AddressRef, Field, FieldBody};
-use crate::fragments::mailbox::mailbox;
-use crate::fragments::address::{mailbox_list, address_list, address_list_cfws};
-use crate::fragments::identification::msg_id;
-use crate::fragments::{datetime, trace, model};
-
-/// HEADERS
-
-///
-pub fn from_bytes<'a>(rawmail: &'a [u8]) -> (Cow<'a, str>, &Encoding, bool) {
-    // Create detector
-    let mut detector = EncodingDetector::new();
-    detector.feed(&rawmail, true);
-
-    // Get encoding
-    let enc: &Encoding = detector.guess(None, true);
-    enc.decode(&rawmail)
-}
-
-/// Internal header section
-///
-/// See: https://www.rfc-editor.org/rfc/rfc5322.html#section-2.2
-pub fn section<'a>(input: &'a str) -> IResult<&'a str, HeaderSection> {
-    let (input, headers) = fold_many0(
-        alt((known_field, unknown_field, rescue_field)),
-        HeaderSection::default,
-        |mut section, head| {
-            match head {
-                //@FIXME min and max limits are not enforced,
-                // it may result in missing data or silently overriden data.
-
-                // 3.6.1.  The Origination Date Field
-                //   | orig-date      | 1      | 1          |                            |
-                Field::Date(FieldBody::Correct(d)) => {
-                    section.date = d;
-                }
-
-                // 3.6.2.  Originator Fields
-                Field::From(FieldBody::Correct(v)) => {
-                    //   | from           | 1      | 1          | See sender and 3.6.2       |
-                    section.from = v;
-                }
-                Field::Sender(FieldBody::Correct(mbx)) => {
-                    //   | sender         | 0*     | 1          | MUST occur with  multi-address from - see 3.6.2 |
-                    section.sender = Some(mbx);
-                }
-                Field::ReplyTo(FieldBody::Correct(addr_list)) => {
-                    //   | reply-to       | 0      | 1          |                            |
-                    section.reply_to = addr_list;
-                }
-
-                // 3.6.3.  Destination Address Fields
-                Field::To(FieldBody::Correct(addr_list)) => {
-                    //    | to             | 0      | 1          |                            |
-                    section.to = addr_list;
-                }
-                Field::Cc(FieldBody::Correct(addr_list)) => {
-                    //    | cc             | 0      | 1          |                            |
-                    section.cc = addr_list;
-                }
-                Field::Bcc(FieldBody::Correct(addr_list)) => {
-                    //    | bcc            | 0      | 1          |                            |
-                    section.bcc = addr_list;
-                }
-
-                // 3.6.4.  Identification Fields
-                Field::MessageID(FieldBody::Correct(msg_id)) => {
-                    //    | message-id     | 0*     | 1          | SHOULD be present - see  3.6.4 |
-                    section.msg_id = Some(msg_id);
-                }
-                Field::InReplyTo(FieldBody::Correct(id_list)) => {
-                    //    | in-reply-to    | 0*     | 1          | SHOULD occur in some replies - see 3.6.4  |
-                    section.in_reply_to = id_list;
-                }
-                Field::References(FieldBody::Correct(id_list)) => {
-                    //    | in-reply-to    | 0*     | 1          | SHOULD occur in some replies - see 3.6.4  |
-                    section.references = id_list;
-                }
-
-                // 3.6.5.  Informational Fields
-                Field::Subject(FieldBody::Correct(title)) => {
-                    //    | subject        | 0      | 1          |                            |
-                    section.subject = Some(title);
-                }               
-                Field::Comments(FieldBody::Correct(coms)) => {
-                    //    | comments       | 0      | unlimited  |                            |
-                    section.comments.push(coms);
-                }
-                Field::Keywords(FieldBody::Correct(mut kws)) => {
-                    //    | keywords       | 0      | unlimited  |                            |
-                    section.keywords.append(&mut kws);
-                }
-
-                // 3.6.6   Resent Fields are not implemented
-                // 3.6.7   Trace Fields
-                Field::ReturnPath(FieldBody::Correct(maybe_mbx)) => {
-                    if let Some(mbx) = maybe_mbx {
-                        section.return_path.push(mbx);
-                    }
-                }
-                Field::Received(FieldBody::Correct(log)) => {
-                    section.received.push(log);
-                }
-
-                // 3.6.8.  Optional Fields
-                Field::Optional(name, body) => {
-                    section.optional.insert(name, body);
-                }
-
-                // Rescue
-                Field::Rescue(x) => {
-                    section.unparsed.push(x);
-                }
-
-                bad_field => {
-                   section.bad_fields.push(bad_field);
-                }
-            };
-            section
-        }
-    )(input)?;
-    
-    let (input, _) = perm_crlf(input)?;
-    Ok((input, headers))
-}
-
-
-
-/// Parse one known header field
-///
-/// RFC5322 optional-field seems to be a generalization of the field terminology.
-/// We use it to parse all header names:
-pub fn known_field(input: &str) -> IResult<&str, Field> {
-    terminated(
-        alt((
-            // 3.6.1.  The Origination Date Field
-            date,
-            // 3.6.2.  Originator Fields
-            alt((from, sender, reply_to)),
-            // 3.6.3.  Destination Address Fields
-            alt((to, cc, bcc)),
-            // 3.6.4.  Identification Fields
-            alt((msg_id_field, in_reply_to, references)),
-            // 3.6.5.  Informational Fields
-            alt((subject, comments, keywords)),
-            // 3.6.7   Trace field
-            alt((return_path, received)),
-        )),
-        perm_crlf,
-    )(input)
-}
-
-/// A high-level function to match more easily a field name
-fn field_name_tag(field_name: &str) -> impl FnMut(&str) -> IResult<&str, &str> + '_  {
-    move |input: &str| {
-        recognize(tuple((tag_no_case(field_name), space0, tag(":"), space0)))(input)
-    }
-}
-
-// 3.6.1.  The Origination Date Field
-fn date(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Date"), alt((
-        map(datetime::section, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Date(b))(input)
-}
-
-// 3.6.2.  Originator Fields
-fn from(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("From"), alt((
-        map(mailbox_list, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::From(b))(input)
-}
-fn sender(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Sender"), alt((
-        map(mailbox, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Sender(b))(input)
-}
-fn reply_to(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Reply-To"), alt((
-        map(address_list, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::ReplyTo(b))(input)
-}
-
-// 3.6.3.  Destination Address Fields
-fn to(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("To"), alt((
-        map(address_list, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::To(b))(input)
-}
-fn cc(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Cc"), alt((
-        map(address_list, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Cc(b))(input)
-}
-fn bcc(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Bcc"), alt((
-        map(opt(alt((address_list, address_list_cfws))), |dt| FieldBody::Correct(dt.unwrap_or(vec![]))),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Bcc(b))(input)
-}
-
-// 3.6.4.  Identification Fields
-fn msg_id_field(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Message-ID"), alt((
-        map(msg_id, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::MessageID(b))(input)
-}
-fn in_reply_to(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("In-Reply-To"), alt((
-        map(many1(msg_id), |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::InReplyTo(b))(input)
-}
-fn references(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("References"), alt((
-        map(many1(msg_id), |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::References(b))(input)
-}
-
-// 3.6.5.  Informational Fields
-fn subject(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Subject"), alt((
-        map(unstructured, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Subject(b))(input)
-}
-fn comments(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Comments"), alt((
-        map(unstructured, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Comments(b))(input)
-}
-fn keywords(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Keywords"), alt((
-        map(separated_list1(tag(","), phrase), |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Keywords(b))(input)
-}
-
-
-// 3.6.6 Resent fields
-// Not implemented
-
-// 3.6.7 Trace fields
-fn return_path(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Return-Path"), alt((
-        map(trace::return_path_body, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::ReturnPath(b))(input)
-}
-fn received(input: &str) -> IResult<&str, Field> {
-    map(preceded(field_name_tag("Received"), alt((
-        map(trace::received_body, |dt| FieldBody::Correct(dt)),
-        map(rescue, |r| FieldBody::Failed(r))))),
-    |b| Field::Received(b))(input)
-}
-
-/// Optional field
-///
-/// ```abnf
-/// field      =   field-name ":" unstructured CRLF
-/// field-name =   1*ftext
-/// ftext      =   %d33-57 /          ; Printable US-ASCII
-///                %d59-126           ;  characters not including
-///                                   ;  ":".
-/// ```
-fn unknown_field(input: &str) -> IResult<&str, Field> {
-    // Extract field name
-    let (input, field_name) = field_name(input)?;
-    let (input, body) = unstructured(input)?;
-    let (input, _) = perm_crlf(input)?;
-    Ok((input, Field::Optional(field_name, body)))
-}
-fn field_name(input: &str) -> IResult<&str, &str> {
-    terminated(
-        take_while1(|c| c >= '\x21' && c <= '\x7E' && c != '\x3A'),
-        tuple((space0, tag(":"), space0))
-    )(input)
-}
-
-/// Rescue rule
-///
-/// Something went wrong while parsing headers,
-/// trying to fix parsing by consuming
-/// one unfolded header line.
-///
-/// ```abnf
-/// rescue = *(*any FWS) *any CRLF
-fn rescue(input: &str) -> IResult<&str, &str> {
-    recognize(pair(
-        many0(pair(is_not("\r\n"), fws)),
-        is_not("\r\n"),
-    ))(input)
-}
-
-fn rescue_field(input: &str) -> IResult<&str, Field> {
-    map(terminated(rescue, perm_crlf), |r| Field::Rescue(r))(input)
-}
-
-
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::fragments::model::{GroupRef, AddrSpec};
-
-    // 3.6.1.  The Origination Date Field
-/*    #[test]
-    fn test_datetime() {
-        let datefield = "Date: Thu,\r\n  13\r\n  Feb\r\n    1969\r\n 23:32\r\n   -0330 (Newfoundland Time)\r\n";
-        let (input, v) = known_field(datefield).unwrap();
-        assert_eq!(input, "");
-        match v {
-            Field::Date(HeaderDate::Parsed(_)) => (),
-            _ => panic!("Date has not been parsed"),
-        };
-    }*/
-
-    // 3.6.2.  Originator Fields
-    #[test]
-    fn test_from() {
-        assert_eq!(
-            known_field("From: \"Joe Q. Public\" <john.q.public@example.com>\r\n"),
-            Ok(("", Field::From(FieldBody::Correct(vec![MailboxRef { 
-                name: Some("Joe Q. Public".into()), 
-                addrspec: AddrSpec {
-                    local_part: "john.q.public".into(),
-                    domain: "example.com".into(),
-                }
-            }])))),
-        );
-    }
-    #[test]
-    fn test_sender() {
-        assert_eq!(
-            known_field("Sender: Michael Jones <mjones@machine.example>\r\n"),
-            Ok(("", Field::Sender(FieldBody::Correct(MailboxRef {
-                name: Some("Michael Jones".into()),
-                addrspec: AddrSpec {
-                    local_part: "mjones".into(),
-                    domain: "machine.example".into(),
-                },
-            })))),
-        );
-    }
-    #[test]
-    fn test_reply_to() {
-        assert_eq!(
-            known_field("Reply-To: \"Mary Smith: Personal Account\" <smith@home.example>\r\n"),
-            Ok(("", Field::ReplyTo(FieldBody::Correct(vec![AddressRef::Single(MailboxRef {
-                name: Some("Mary Smith: Personal Account".into()),
-                addrspec: AddrSpec {
-                    local_part: "smith".into(),
-                    domain: "home.example".into(),
-                },
-            })]))))
-        );
-    }
-
-    // 3.6.3.  Destination Address Fields
-    #[test]
-    fn test_to() {
-        assert_eq!(
-            known_field("To: A Group:Ed Jones <c@a.test>,joe@where.test,John <jdoe@one.test>;\r\n"),
-            Ok(("", Field::To(FieldBody::Correct(vec![AddressRef::Many(GroupRef {
-                name: "A Group".into(),
-                participants: vec![
-                    MailboxRef {
-                        name: Some("Ed Jones".into()),
-                        addrspec: AddrSpec { local_part: "c".into(), domain: "a.test".into() },
-                    },
-                    MailboxRef {
-                        name: None,
-                        addrspec: AddrSpec { local_part: "joe".into(), domain: "where.test".into() },
-                    },
-                    MailboxRef {
-                        name: Some("John".into()),
-                        addrspec: AddrSpec { local_part: "jdoe".into(), domain: "one.test".into() },
-                    },
-                ]
-            })]))))
-        );
-    }
-    #[test]
-    fn test_cc() {
-        assert_eq!(
-            known_field("Cc: Undisclosed recipients:;\r\n"),
-            Ok(("", Field::Cc(FieldBody::Correct(vec![AddressRef::Many(GroupRef {
-                name: "Undisclosed recipients".into(),
-                participants: vec![],
-            })]))))
-        );
-    }
-    #[test]
-    fn test_bcc() {
-        assert_eq!(
-            known_field("Bcc: (empty)\r\n"),
-            Ok(("", Field::Bcc(FieldBody::Correct(vec![]))))
-        );
-        assert_eq!(
-            known_field("Bcc: \r\n"),
-            Ok(("", Field::Bcc(FieldBody::Correct(vec![]))))
-        );
-    }
-
-
-    // 3.6.4.  Identification Fields
-    #[test]
-    fn test_message_id() {
-        assert_eq!(
-            known_field("Message-ID: <310@[127.0.0.1]>\r\n"),
-            Ok(("", Field::MessageID(FieldBody::Correct(model::MessageId { left: "310", right: "127.0.0.1" }))))
-        );
-    }
-    #[test]
-    fn test_in_reply_to() {
-        assert_eq!(
-            known_field("In-Reply-To: <a@b> <c@example.com>\r\n"),
-            Ok(("", Field::InReplyTo(FieldBody::Correct(vec![
-                model::MessageId { left: "a", right: "b" },
-                model::MessageId { left: "c", right: "example.com" },
-            ]))))
-        );
-    }
-    #[test]
-    fn test_references() {
-        assert_eq!(
-            known_field("References: <1234@local.machine.example> <3456@example.net>\r\n"),
-            Ok(("", Field::References(FieldBody::Correct(vec![
-                model::MessageId { left: "1234", right: "local.machine.example" },
-                model::MessageId { left: "3456", right: "example.net" },
-            ]))))
-        );
-    }
-
-    // 3.6.5.  Informational Fields
-    #[test]
-    fn test_subject() {
-        assert_eq!(
-            known_field("Subject: Aérogramme\r\n"),
-            Ok(("", Field::Subject(FieldBody::Correct("Aérogramme".into()))))
-        );
-    }
-    #[test]
-    fn test_comments() {
-        assert_eq!(
-            known_field("Comments: 😛 easter egg!\r\n"),
-            Ok(("", Field::Comments(FieldBody::Correct("😛 easter egg!".into()))))
-        );
-    }
-    #[test]
-    fn test_keywords() {
-        assert_eq!(
-            known_field("Keywords: fantasque, farfelu, fanfreluche\r\n"),
-            Ok(("", Field::Keywords(FieldBody::Correct(vec!["fantasque".into(), "farfelu".into(), "fanfreluche".into()]))))
-        );
-    }
-
-    // Test invalid field name
-    #[test]
-    fn test_invalid_field_name() {
-        assert!(known_field("Unknown: unknown\r\n").is_err());
-    }
-
-    #[test]
-    fn test_rescue_field() {
-        assert_eq!(
-            rescue_field("Héron: élan\r\n\tnoël: test\r\nFrom: ..."),
-            Ok(("From: ...", Field::Rescue("Héron: élan\r\n\tnoël: test"))),
-        );
-    }
-
-    #[test]
-    fn test_wrong_fields() {
-        let fullmail = r#"Return-Path: xoxo
-From: !!!!
-
-Hello world"#;
-        assert_eq!(
-            section(fullmail),
-            Ok(("Hello world", HeaderSection {
-                bad_fields: vec![
-                    Field::ReturnPath(FieldBody::Failed("xoxo")),
-                    Field::From(FieldBody::Failed("!!!!")),
-                ],
-                ..Default::default()
-            }))
-        );
-    }
-
-    #[test]
-    fn test_section() {
-        use chrono::{FixedOffset, TimeZone};
-        use std::collections::HashMap;
-
-        let fullmail = r#"Return-Path: <gitlab@example.com>
-Delivered-To: quentin@example.com
-Received: from smtp.example.com ([10.83.2.2])
-	by doradille with LMTP
-	id xyzabcd
-	(envelope-from <gitlab@example.com>)
-	for <quentin@example.com>; Tue, 13 Jun 2023 19:01:08 +0000
-Date: Tue, 13 Jun 2023 10:01:10 +0200
-From: Mary Smith
- <mary@example.net>, "A\lan" <alan@example>
-Sender: imf@example.com
-Reply-To: "Mary Smith: Personal Account" <smith@home.example>
-To: John Doe <jdoe@machine.example>
-Cc: imf2@example.com
-Bcc: (hidden)
-Subject: Re: Saying Hello
-Comments: A simple message
-Comments: Not that complicated
-comments : not valid header name but should be accepted
-    by the parser.
-Keywords: hello, world
-Héron: Raté
- Raté raté
-Keywords: salut, le, monde
-Not a real header but should still recover
-Message-ID: <3456@example.net>
-In-Reply-To: <1234@local.machine.example>
-References: <1234@local.machine.example>
-Unknown: unknown
-
-This is a reply to your hello.
-"#;
-        assert_eq!(
-            section(fullmail),
-            Ok(("This is a reply to your hello.\n", HeaderSection {
-                date: Some(FixedOffset::east_opt(2 * 3600).unwrap().with_ymd_and_hms(2023, 06, 13, 10, 01, 10).unwrap()),
-
-                from: vec![MailboxRef {
-                    name: Some("Mary Smith".into()),
-                    addrspec: AddrSpec {
-                        local_part: "mary".into(),
-                        domain: "example.net".into(),
-                    }
-                }, MailboxRef {
-                    name: Some("Alan".into()),
-                    addrspec: AddrSpec {
-                        local_part: "alan".into(),
-                        domain: "example".into(),
-                    }
-                }],
-
-                sender: Some(MailboxRef {
-                    name: None,
-                    addrspec: AddrSpec {
-                        local_part: "imf".into(),
-                        domain: "example.com".into(),
-                    }
-                }),
-
-                reply_to: vec![AddressRef::Single(MailboxRef {
-                    name: Some("Mary Smith: Personal Account".into()),
-                    addrspec: AddrSpec {
-                        local_part: "smith".into(),
-                        domain: "home.example".into(),
-                    }
-                })],
-
-                to: vec![AddressRef::Single(MailboxRef {
-                    name: Some("John Doe".into()),
-                    addrspec: AddrSpec {
-                        local_part: "jdoe".into(),
-                        domain: "machine.example".into(),
-                    }
-                })],
-
-                cc: vec![AddressRef::Single(MailboxRef {
-                    name: None,
-                    addrspec: AddrSpec {
-                        local_part: "imf2".into(),
-                        domain: "example.com".into(),
-                    }
-                })],
-
-                bcc: vec![],
-
-                msg_id: Some(model::MessageId { left: "3456", right: "example.net" }),
-                in_reply_to: vec![model::MessageId { left: "1234", right: "local.machine.example" }],
-                references: vec![model::MessageId { left: "1234", right: "local.machine.example" }],
-
-                subject: Some("Re: Saying Hello".into()),
-
-                comments: vec![
-                    "A simple message".into(),
-                    "Not that complicated".into(),
-                    "not valid header name but should be accepted by the parser.".into(),
-                ],
-
-                keywords: vec![
-                    "hello".into(), "world".into(), "salut".into(), "le".into(), "monde".into()
-                ],
-
-                received: vec![ 
-                    "from smtp.example.com ([10.83.2.2])\n\tby doradille with LMTP\n\tid xyzabcd\n\t(envelope-from <gitlab@example.com>)\n\tfor <quentin@example.com>" 
-                ],
-
-                return_path: vec![MailboxRef {
-                    name: None,
-                    addrspec: AddrSpec {
-                        local_part: "gitlab".into(),
-                        domain: "example.com".into(),
-                    }
-                }],
-
-                optional: HashMap::from([
-                    ("Delivered-To", "quentin@example.com".into()),
-                    ("Unknown", "unknown".into()), 
-                ]),
-
-                unparsed: vec![
-                    "Héron: Raté\n Raté raté",
-                    "Not a real header but should still recover",
-                ],
-
-                bad_fields: vec![],
-            }))
-        );
-    }
-}

src/fragments/identification.rs

@@ -1,54 +0,0 @@
-use std::borrow::Cow;
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::{take_while, tag},
-    combinator::opt,
-    sequence::{delimited, pair, tuple},
-};
-
-use crate::fragments::whitespace::cfws;
-use crate::fragments::words::dot_atom_text;
-use crate::fragments::mailbox::is_dtext;
-use crate::fragments::model::MessageId;
-
-/// Message identifier
-///
-/// ```abnf
-///    msg-id          =   [CFWS] "<" id-left "@" id-right ">" [CFWS]
-/// ```
-pub fn msg_id(input: &str) -> IResult<&str, MessageId> {
-    let (input, (left, _, right)) = delimited(
-        pair(opt(cfws), tag("<")),
-        tuple((id_left, tag("@"), id_right)),
-        pair(tag(">"), opt(cfws)),
-    )(input)?;
-    Ok((input, MessageId{ left, right }))
-}
-
-// Missing obsolete
-fn id_left(input: &str) -> IResult<&str, &str> {
-    dot_atom_text(input)   
-}
-
-// Missing obsolete
-fn id_right(input: &str) -> IResult<&str, &str> {
-    alt((dot_atom_text, no_fold_litteral))(input)
-}
-
-fn no_fold_litteral(input: &str) -> IResult<&str, &str> {
-    delimited(tag("["), take_while(is_dtext), tag("]"))(input)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_msg_id() {
-        assert_eq!(
-            msg_id("<5678.21-Nov-1997@example.com>"),
-            Ok(("", MessageId{left: "5678.21-Nov-1997", right: "example.com"})),
-        );
-    }
-}

src/fragments/mailbox.rs

@@ -1,333 +0,0 @@
-use std::borrow::Cow;
-use nom::{
-    IResult,
-    Parser,
-    branch::alt,
-    bytes::complete::{tag, is_a},
-    character::complete::satisfy,
-    combinator::{into,map,opt,recognize},
-    multi::{separated_list1, fold_many0, many0, many1},
-    sequence::{delimited,pair,preceded,terminated,tuple},
-};
-
-use crate::fragments::model::{MailboxRef, AddrSpec};
-use crate::fragments::misc_token::{phrase, word};
-use crate::fragments::whitespace::{cfws, fws, is_obs_no_ws_ctl};
-use crate::fragments::words::{atom, dot_atom};
-use crate::fragments::quoted::quoted_string;
-
-/// Mailbox
-///
-/// ```abnf
-///    mailbox         =   name-addr / addr-spec
-/// ```
-pub fn mailbox(input: &str) -> IResult<&str, MailboxRef> {
-    alt((name_addr, into(addr_spec)))(input)
-}
-
-/// Name of the email address
-///
-/// ```abnf
-///    name-addr       =   [display-name] angle-addr
-/// ```
-fn name_addr(input: &str) -> IResult<&str, MailboxRef> {
-    let (input, name) = opt(phrase)(input)?;
-    let (input, mut mbox) = angle_addr(input)?;
-    mbox.name = name;
-    Ok((input, mbox))
-}
-
-/// Enclosed addr-spec with < and >
-///
-/// ```abnf
-/// angle-addr      =   [CFWS] "<" addr-spec ">" [CFWS] /
-///                     obs-angle-addr
-/// ```
-pub fn angle_addr(input: &str) -> IResult<&str, MailboxRef> {
-   delimited(
-       tuple((opt(cfws), tag("<"), opt(obs_route))),
-       into(addr_spec),
-       pair(tag(">"), opt(cfws)),
-    )(input)
-}
-
-///    obs-route       =   obs-domain-list ":"
-fn obs_route(input: &str) -> IResult<&str, Vec<String>> {
-    terminated(obs_domain_list, tag(":"))(input)
-}
-
-/// ```abnf
-///    obs-domain-list =   *(CFWS / ",") "@" domain
-///                        *("," [CFWS] ["@" domain])
-/// ```
-fn obs_domain_list(input: &str) -> IResult<&str, Vec<String>> {
-    //@FIXME complexity is O(n) in term of domains here.
-    let (input, head) = preceded(pair(many0(alt((recognize(cfws), tag(",")))), tag("@")), obs_domain)(input)?; 
-    let (input, mut rest) = obs_domain_list_rest(input)?;
-    rest.insert(0, head);
-    Ok((input, rest))
-}
-
-fn obs_domain_list_rest(input: &str) -> IResult<&str, Vec<String>> {
-    map(
-        many0(preceded(
-            pair(tag(","), opt(cfws)),
-            opt(preceded(tag("@"), obs_domain)),
-        )),
-        |v: Vec<Option<String>>| v.into_iter().flatten().collect()
-    )(input)
-}
-
-/// AddrSpec
-///
-/// ```abnf
-///    addr-spec       =   local-part "@" domain
-/// ```
-/// @FIXME: this system does not work to alternate between strict and obsolete
-/// so I force obsolete for now...
-pub fn addr_spec(input: &str) -> IResult<&str, AddrSpec> {
-    map(
-        tuple((obs_local_part, tag("@"), obs_domain, many0(pair(tag("@"), obs_domain)))),
-        |(local_part, _, domain, _)| 
-            AddrSpec { local_part, domain },
-    )(input)
-}
-
-/// Local part
-///
-/// ```abnf
-///    local-part      =   dot-atom / quoted-string / obs-local-part
-/// ```
-fn strict_local_part(input: &str) -> IResult<&str, String> {
-    alt((into(dot_atom), quoted_string))(input)
-}
-
-/// Obsolete local part
-///
-/// Compared to the RFC, we allow multiple dots.
-/// This is found in Enron emails and supported by Gmail.
-///
-/// Obsolete local part is a superset of strict_local_part:
-/// anything that is parsed by strict_local_part will be parsed by 
-/// obs_local_part.
-///
-/// ```abnf
-/// obs-local-part  =  *("." / word)
-/// ```
-fn obs_local_part(input: &str) -> IResult<&str, String> {
-    fold_many0(
-        alt((map(is_a("."), Cow::Borrowed), word)),
-        String::new,
-        |acc, chunk| acc + &chunk)(input)
-}
-
-/// Domain
-///
-/// ```abnf
-///    domain          =   dot-atom / domain-literal
-/// ```
-pub fn strict_domain(input: &str) -> IResult<&str, String> {
-    alt((into(dot_atom), domain_litteral))(input)
-}
-
-/// Obsolete domain
-///
-/// Rewritten so that obs_domain is a superset
-/// of strict_domain.
-///
-/// ```abnf
-///  obs-domain      =   atom *("." atom) / domain-literal
-/// ```
-pub fn obs_domain(input: &str) -> IResult<&str, String> {
-    alt((map(separated_list1(tag("."), atom), |v| v.join(".")), domain_litteral))(input)
-}
-
-/// Domain litteral
-///
-/// ```abnf
-///    domain-literal  =   [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
-/// ```
-fn domain_litteral(input: &str) -> IResult<&str, String> {
-    delimited(
-        pair(opt(cfws), tag("[")),
-        inner_domain_litteral,
-        pair(tag("]"), opt(cfws))
-    )(input)
-}
-
-fn inner_domain_litteral(input: &str) -> IResult<&str, String> {
-    let (input, (cvec, maybe_wsp)) = pair(many0(pair(opt(fws), satisfy(is_dtext))), opt(fws))(input)?;
-    let mut domain = cvec.iter().fold(
-        String::with_capacity(16),
-        |mut acc, (maybe_wsp, c)| {
-            if let Some(wsp) = maybe_wsp {
-                acc.push(*wsp);
-            }
-            acc.push(*c);
-            acc
-        });
-    if let Some(wsp) = maybe_wsp {
-        domain.push(wsp);
-    }
-
-    Ok((input, domain))
-}
-
-
-fn is_strict_dtext(c: char) -> bool {
-    (c >= '\x21' && c <= '\x5A') || (c >= '\x5E' && c <= '\x7E') || !c.is_ascii()
-}
-
-/// Is domain text
-///
-/// ```abnf
-///   dtext           =   %d33-90 /          ; Printable US-ASCII
-///                       %d94-126 /         ;  characters not including
-///                       obs-dtext          ;  "[", "]", or "\"
-///   obs-dtext       =   obs-NO-WS-CTL / quoted-pair
-/// ```
-pub fn is_dtext(c: char) -> bool {
-    is_strict_dtext(c) || is_obs_no_ws_ctl(c) 
-    //@FIXME does not support quoted pair yet while RFC requires it
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_addr_spec() {
-        assert_eq!(addr_spec("alice@example.com"), Ok(("", AddrSpec{local_part: "alice".into(), domain: "example.com".into() })));
-
-        assert_eq!(addr_spec("jsmith@[192.168.2.1]"), Ok(("", AddrSpec{local_part: "jsmith".into(), domain: "192.168.2.1".into() })));
-        assert_eq!(addr_spec("jsmith@[IPv6:2001:db8::1]"), Ok(("", AddrSpec{local_part: "jsmith".into(), domain: "IPv6:2001:db8::1".into() })));
-
-        // UTF-8
-        assert_eq!(addr_spec("用户@例子.广告"), Ok(("", AddrSpec{local_part: "用户".into(), domain: "例子.广告".into()})));
-
-        // ASCII Edge cases
-        assert_eq!(
-            addr_spec("user+mailbox/department=shipping@example.com"),
-            Ok(("", AddrSpec{local_part: "user+mailbox/department=shipping".into(), domain: "example.com".into()})));
-        assert_eq!(
-            addr_spec("!#$%&'*+-/=?^_`.{|}~@example.com"),
-            Ok(("", AddrSpec{local_part: "!#$%&'*+-/=?^_`.{|}~".into(), domain: "example.com".into()})));
-        assert_eq!(
-            addr_spec(r#""Abc@def"@example.com"#),
-            Ok(("", AddrSpec{local_part: "Abc@def".into(), domain: "example.com".into()})));
-        assert_eq!(addr_spec(r#""Fred\ Bloggs"@example.com"#), Ok(("", AddrSpec{local_part: "Fred Bloggs".into(), domain: "example.com".into()})));
-        assert_eq!(addr_spec(r#""Joe.\\Blow"@example.com"#), Ok(("", AddrSpec{local_part: r#"Joe.\Blow"#.into(), domain: "example.com".into()})));
-    }
-
-    #[test]
-    fn test_mailbox() {
-        assert_eq!(mailbox(r#""Joe Q. Public" <john.q.public@example.com>"#), Ok(("", MailboxRef {
-            name: Some("Joe Q. Public".into()),
-            addrspec: AddrSpec {
-                local_part: "john.q.public".into(),
-                domain: "example.com".into(),
-            }
-        })));
-
-        assert_eq!(mailbox(r#"Mary Smith <mary@x.test>"#), Ok(("", MailboxRef {
-            name: Some("Mary Smith".into()),
-            addrspec: AddrSpec {
-                local_part: "mary".into(),
-                domain: "x.test".into(),
-            }
-        })));
-
-        assert_eq!(mailbox(r#"jdoe@example.org"#), Ok(("", MailboxRef {
-            name: None,
-            addrspec: AddrSpec {
-                local_part: "jdoe".into(),
-                domain: "example.org".into(),
-            }
-        })));
-
-        assert_eq!(mailbox(r#"Who? <one@y.test>"#), Ok(("", MailboxRef {
-            name: Some("Who?".into()),
-            addrspec: AddrSpec {
-                local_part: "one".into(),
-                domain: "y.test".into(),
-            }
-        })));
-
-        assert_eq!(mailbox(r#"<boss@nil.test>"#), Ok(("", MailboxRef {
-            name: None,
-            addrspec: AddrSpec {
-                local_part: "boss".into(),
-                domain: "nil.test".into(),
-            }
-        })));
-
-        assert_eq!(mailbox(r#""Giant; \"Big\" Box" <sysservices@example.net>"#), Ok(("", MailboxRef {
-            name: Some(r#"Giant; "Big" Box"#.into()),
-            addrspec: AddrSpec {
-                local_part: "sysservices".into(),
-                domain: "example.net".into(),
-            }
-        })));
-    }
-
-    #[test]
-    fn test_obs_domain_list() {
-        assert_eq!(obs_domain_list(r#"(shhh it's coming)
- ,
- (not yet)
- @33+4.com,,,,
- ,,,,
- (again)
- @example.com,@yep.com,@a,@b,,,@c"#),
-            Ok(("", vec!["33+4.com".into(), "example.com".into(), "yep.com".into(), "a".into(), "b".into(), "c".into()]))
-        );
-    }
-
-    #[test]
-    fn test_enron1() {
-        assert_eq!(
-            addr_spec("a..howard@enron.com"),
-            Ok(("", AddrSpec {
-                local_part: "a..howard".into(),
-                domain: "enron.com".into(),
-            }))
-        );
-    }
-
-    #[test]
-    fn test_enron2() {
-        assert_eq!(
-            addr_spec(".nelson@enron.com"),
-            Ok(("", AddrSpec {
-                local_part: ".nelson".into(),
-                domain: "enron.com".into(),
-            }))
-        );
-    }
-
-    #[test]
-    fn test_enron3() {
-        assert_eq!(
-            addr_spec("ecn2760.conf.@enron.com"),
-            Ok(("", AddrSpec {
-                local_part: "ecn2760.conf.".into(),
-                domain: "enron.com".into(),
-            }))
-        );
-    }
-
-
-    #[test]
-    fn test_enron4() {
-        assert_eq!(
-            mailbox(r#"<"mark_kopinski/intl/acim/americancentury"@americancentury.com@enron.com>"#),
-            Ok(("", MailboxRef {
-                name: None,
-                addrspec: AddrSpec {
-                    local_part: "mark_kopinski/intl/acim/americancentury".into(),
-                    domain: "americancentury.com".into(),
-                }
-            }))
-        );
-    }
-}

src/fragments/misc_token.rs

@@ -1,79 +0,0 @@
-use std::borrow::Cow;
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::take_while1,
-    character::complete::space0,
-    combinator::{into, opt},
-    multi::{many0, many1},
-    sequence::{pair, tuple},
-};
-
-use crate::fragments::quoted::quoted_string;
-use crate::fragments::whitespace::{fws, is_obs_no_ws_ctl};
-use crate::fragments::words::{atom, is_vchar};
-
-/// Word
-///
-/// ```abnf
-///    word            =   atom / quoted-string
-/// ```
-pub fn word(input: &str) -> IResult<&str, Cow<str>> {
-    alt((into(quoted_string), into(atom)))(input)
-}
-
-/// Phrase
-///
-/// ```abnf
-///    phrase          =   1*word / obs-phrase
-/// ```
-pub fn phrase(input: &str) -> IResult<&str, String> {
-    let (input, words) = many1(word)(input)?;
-    let phrase = words.join(" ");
-    Ok((input, phrase))
-}
-
-/// Compatible unstructured input
-///
-/// ```abnf
-/// obs-utext       =   %d0 / obs-NO-WS-CTL / VCHAR
-/// ```
-fn is_unstructured(c: char) -> bool {
-    is_vchar(c) || is_obs_no_ws_ctl(c) || c == '\x00'
-}
-
-/// Unstructured header field body
-///
-/// ```abnf
-/// unstructured    =   (*([FWS] VCHAR_SEQ) *WSP) / obs-unstruct
-/// ```
-pub fn unstructured(input: &str) -> IResult<&str, String> {
-    let (input, r) = many0(tuple((opt(fws), take_while1(is_unstructured))))(input)?;
-    let (input, _) = space0(input)?;
-
-    // Try to optimize for the most common cases
-    let body = match r.as_slice() {
-        [(None, content)] => content.to_string(),
-        [(Some(_), content)] => " ".to_string() + content,
-        lines => lines.iter().fold(String::with_capacity(255), |acc, item| {
-            let (may_ws, content) = item;
-            match may_ws {
-                Some(_) => acc + " " + content,
-                None => acc + content,
-            }
-        }),
-    };
-
-    Ok((input, body))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    #[test]
-    fn test_phrase() {
-        assert_eq!(phrase("hello world"), Ok(("", "hello world".into())));
-        assert_eq!(phrase("salut \"le\" monde"), Ok(("", "salut le monde".into())));
-        assert_eq!(phrase("fin\r\n du\r\nmonde"), Ok(("\r\nmonde", "fin du".into())));
-    }
-}

src/fragments/mod.rs

@@ -1,18 +0,0 @@
-// Model
-pub mod model;
-
-// Generic
-pub mod whitespace;
-mod words;
-mod quoted;
-mod misc_token;
-
-// Header specific
-mod mailbox;
-mod address;
-mod identification;
-mod trace;
-mod datetime;
-
-// Header blocks
-pub mod header;

src/fragments/model.rs

@@ -1,143 +0,0 @@
-use std::collections::HashMap;
-use chrono::{DateTime,FixedOffset,ParseError};
-
-#[derive(Debug, PartialEq)]
-pub struct AddrSpec {
-    pub local_part: String,
-    pub domain: String,
-}
-impl AddrSpec {
-    pub fn fully_qualified(&self) -> String {
-        format!("{}@{}", self.local_part, self.domain)
-    }
-}
-
-#[derive(Debug, PartialEq)]
-pub struct MailboxRef {
-    // The actual "email address" like hello@example.com
-    pub addrspec: AddrSpec,
-    pub name: Option<String>,
-}
-impl From<AddrSpec> for MailboxRef {
-    fn from(addr: AddrSpec) -> Self {
-        MailboxRef {
-            name: None,
-            addrspec: addr,
-        }
-    }
-}
-
-#[derive(Debug, PartialEq)]
-pub struct GroupRef {
-    pub name: String,
-    pub participants: Vec<MailboxRef>,
-}
-
-#[derive(Debug, PartialEq)]
-pub enum AddressRef {
-    Single(MailboxRef),
-    Many(GroupRef),
-}
-impl From<MailboxRef> for AddressRef {
-    fn from(mx: MailboxRef) -> Self {
-        AddressRef::Single(mx)
-    }
-}
-impl From<GroupRef> for AddressRef {
-    fn from(grp: GroupRef) -> Self {
-        AddressRef::Many(grp)
-    }
-}
-
-#[derive(Debug, PartialEq)]
-pub struct MessageId<'a> {
-    pub left: &'a str,
-    pub right: &'a str,
-}
-
-#[derive(Debug, PartialEq)]
-pub enum FieldBody<'a, T> {
-    Correct(T),
-    Failed(&'a str),
-}
-
-#[derive(Debug, PartialEq)]
-pub enum Field<'a> {
-    // 3.6.1.  The Origination Date Field
-    Date(FieldBody<'a, Option<DateTime<FixedOffset>>>),
-
-    // 3.6.2.  Originator Fields
-    From(FieldBody<'a, Vec<MailboxRef>>),
-    Sender(FieldBody<'a, MailboxRef>),
-    ReplyTo(FieldBody<'a, Vec<AddressRef>>),
-
-    // 3.6.3.  Destination Address Fields
-    To(FieldBody<'a, Vec<AddressRef>>),
-    Cc(FieldBody<'a, Vec<AddressRef>>),
-    Bcc(FieldBody<'a, Vec<AddressRef>>),
-
-    // 3.6.4.  Identification Fields
-    MessageID(FieldBody<'a, MessageId<'a>>),
-    InReplyTo(FieldBody<'a, Vec<MessageId<'a>>>),
-    References(FieldBody<'a, Vec<MessageId<'a>>>),
-
-    // 3.6.5.  Informational Fields
-    Subject(FieldBody<'a, String>),
-    Comments(FieldBody<'a, String>),
-    Keywords(FieldBody<'a, Vec<String>>),
-
-    // 3.6.6   Resent Fields (not implemented)
-    // 3.6.7   Trace Fields
-    Received(FieldBody<'a, &'a str>),
-    ReturnPath(FieldBody<'a, Option<MailboxRef>>),
-
-    // 3.6.8.  Optional Fields
-    Optional(&'a str, String),
-
-    // None
-    Rescue(&'a str),
-}
-
-/// Permissive Header Section
-///
-/// This is a structure intended for parsing/decoding,
-/// hence it's support cases where the email is considered
-/// as invalid according to RFC5322 but for which we can
-/// still extract some data.
-#[derive(Debug, PartialEq, Default)]
-pub struct HeaderSection<'a> {
-    // 3.6.1.  The Origination Date Field
-    pub date: Option<DateTime<FixedOffset>>,
-
-    // 3.6.2.  Originator Fields
-    pub from: Vec<MailboxRef>,
-    pub sender: Option<MailboxRef>,
-    pub reply_to: Vec<AddressRef>,
-
-    // 3.6.3.  Destination Address Fields
-    pub to: Vec<AddressRef>,
-    pub cc: Vec<AddressRef>,
-    pub bcc: Vec<AddressRef>,
-
-    // 3.6.4.  Identification Fields
-    pub msg_id: Option<MessageId<'a>>,
-    pub in_reply_to: Vec<MessageId<'a>>,
-    pub references: Vec<MessageId<'a>>,
-    
-    // 3.6.5.  Informational Fields
-    pub subject: Option<String>,
-    pub comments: Vec<String>,
-    pub keywords: Vec<String>,
-
-    // 3.6.6 Not implemented
-    // 3.6.7 Trace Fields
-    pub return_path: Vec<MailboxRef>,
-    pub received: Vec<&'a str>,
-
-    // 3.6.8.  Optional Fields
-    pub optional: HashMap<&'a str, String>,
-
-    // Recovery
-    pub bad_fields: Vec<Field<'a>>,
-    pub unparsed: Vec<&'a str>,
-}

src/fragments/quoted.rs

@@ -1,91 +0,0 @@
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::tag,
-    character::complete::{anychar, satisfy},
-    combinator::opt,
-    multi::many0,
-    sequence::{pair, preceded},
-};
-
-use crate::fragments::words::is_vchar;
-use crate::fragments::whitespace::{fws, cfws, is_obs_no_ws_ctl};
-
-/// Quoted pair
-///
-/// ```abnf
-///    quoted-pair     =   ("\" (VCHAR / WSP)) / obs-qp
-///    obs-qp          =   "\" (%d0 / obs-NO-WS-CTL / LF / CR)
-/// ```
-pub fn quoted_pair(input: &str) -> IResult<&str, char> {
-    preceded(tag("\\"), anychar)(input)
-}
-
-/// Allowed characters in quote
-///
-/// ```abnf
-///   qtext           =   %d33 /             ; Printable US-ASCII
-///                       %d35-91 /          ;  characters not including
-///                       %d93-126 /         ;  "\" or the quote character
-///                       obs-qtext
-/// ```
-fn is_restr_qtext(c: char) -> bool {
-    c == '\x21' || (c >= '\x23' && c <= '\x5B') || (c >= '\x5D' && c <= '\x7E')
-}
-
-fn is_qtext(c: char) -> bool {
-    is_restr_qtext(c) || is_obs_no_ws_ctl(c)
-}
-
-/// Quoted pair content
-///
-/// ```abnf
-///   qcontent        =   qtext / quoted-pair
-/// ```
-fn qcontent(input: &str) -> IResult<&str, char> {
-    alt((satisfy(is_qtext), quoted_pair))(input)
-}
-
-/// Quoted string
-///
-/// ```abnf
-/// quoted-string   =   [CFWS]
-///                     DQUOTE *([FWS] qcontent) [FWS] DQUOTE
-///                     [CFWS]
-/// ```
-pub fn quoted_string(input: &str) -> IResult<&str, String> {
-  let (input, _) = opt(cfws)(input)?;
-  let (input, _) = tag("\"")(input)?;
-  let (input, content) = many0(pair(opt(fws), qcontent))(input)?;
-
-  // Rebuild string
-  let mut qstring = content.iter().fold(
-    String::with_capacity(16), 
-    |mut acc, (maybe_wsp, c)| {
-      if let Some(wsp) = maybe_wsp {
-        acc.push(*wsp);
-      }
-      acc.push(*c);
-      acc
-    });
-
-  let (input, maybe_wsp) = opt(fws)(input)?;
-  if let Some(wsp) = maybe_wsp {
-    qstring.push(wsp);
-  }
-
-  let (input, _) = tag("\"")(input)?;
-  let (input, _) = opt(cfws)(input)?;
-  Ok((input, qstring))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_quoted_string() {
-        assert_eq!(quoted_string(" \"hello\\\"world\" "), Ok(("", "hello\"world".to_string())));
-        assert_eq!(quoted_string("\"hello\r\n world\""), Ok(("", "hello world".to_string())));
-    }
-}

src/fragments/trace.rs

@@ -1,75 +0,0 @@
-use std::collections::HashMap;
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::tag,
-    character::complete::space0,
-    combinator::{map, opt, recognize},
-    multi::many0,
-    sequence::{delimited, pair, tuple},
-};
-use crate::fragments::{datetime, mailbox, model, misc_token, whitespace};
-
-pub fn received_body(input: &str) -> IResult<&str, &str> {
-    map(
-        tuple((
-            recognize(many0(received_tokens)),
-            tag(";"),
-            datetime::section,
-        )),
-        |(tokens, _, _)| tokens, 
-    )(input)
-}
-
-pub fn return_path_body(input: &str) -> IResult<&str, Option<model::MailboxRef>> {
-    alt((
-        map(mailbox::angle_addr, |a| Some(a)), 
-        empty_path
-    ))(input)
-}
-
-fn empty_path(input: &str) -> IResult<&str, Option<model::MailboxRef>> {
-    let (input, _) = tuple((
-        opt(whitespace::cfws),
-        tag("<"),
-        opt(whitespace::cfws),
-        tag(">"),
-        opt(whitespace::cfws),
-    ))(input)?;
-    Ok((input, None))
-}
-
-// @FIXME use obs_domain as it is a superset of domain
-fn received_tokens(input: &str) -> IResult<&str, &str> {
-    alt((
-        recognize(mailbox::angle_addr),
-        recognize(mailbox::addr_spec),
-        recognize(mailbox::obs_domain),
-        recognize(misc_token::word), 
-    ))(input)
-}
-
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use chrono::{FixedOffset, TimeZone};
-
-    #[test]
-    fn test_received_body() {
-        let hdrs = r#"from smtp.example.com ([10.83.2.2])
-    by server with LMTP
-    id xxxxxxxxx
-    (envelope-from <gitlab@example.com>)
-    for <me@example.com>; Tue, 13 Jun 2023 19:01:08 +0000"#;
-
-        assert_eq!(
-            received_body(hdrs),
-            Ok(("",  r#"from smtp.example.com ([10.83.2.2])
-    by server with LMTP
-    id xxxxxxxxx
-    (envelope-from <gitlab@example.com>)
-    for <me@example.com>"#))
-        );
-    }
-}

src/fragments/whitespace.rs

@@ -1,140 +0,0 @@
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::tag,
-    character::complete::{crlf, satisfy, space0, space1},
-    combinator::{recognize, opt},
-    multi::{many0, many1},
-    sequence::{pair, tuple},
-};
-use crate::fragments::quoted::quoted_pair;
-
-// --- whitespaces and comments
-
-// Note: WSP = SP / HTAB = %x20 / %x09
-// nom::*::space0 = *WSP
-// nom::*::space1 = 1*WSP
-
-/// Permissive CRLF
-///
-/// Theoretically, all lines must end with \r\n
-/// but some mail servers like Dovecot support malformated emails,
-/// for example with only \n eol. It works because
-/// \r or \n is allowed nowhere else, so we also add this support.
-pub fn perm_crlf(input: &str) -> IResult<&str, &str> {
-    alt((crlf, tag("\r"), tag("\n")))(input)
-}
-
-/// Permissive foldable white space
-///
-/// Folding white space are used for long headers splitted on multiple lines.
-/// The obsolete syntax allowes multiple lines without content; implemented for compatibility
-/// reasons
-pub fn fws(input: &str) -> IResult<&str, char> {
-    let (input, _) = alt((recognize(many1(fold_marker)), space1))(input)?;
-    Ok((input, ' '))
-}
-fn fold_marker(input: &str) -> IResult<&str, &str> {
-   let (input, _) = space0(input)?;
-   let (input, _) = perm_crlf(input)?;
-   space1(input)
-}
-
-
-/// Folding White Space with Comment
-///
-/// Note: we drop the comments for now...  
-///
-/// ```abnf
-///   ctext           =   %d33-39 /          ; Printable US-ASCII
-///                       %d42-91 /          ;  characters not including
-///                       %d93-126 /         ;  "(", ")", or "\"
-///                       obs-ctext
-///
-///   ccontent        =   ctext / quoted-pair / comment
-///
-///   comment         =   "(" *([FWS] ccontent) [FWS] ")"
-///
-///   CFWS            =   (1*([FWS] comment) [FWS]) / FWS
-/// ```
-pub fn cfws(input: &str) -> IResult<&str, &str> {
-    alt((recognize(comments), recognize(fws)))(input)
-}
-
-pub fn comments(input: &str) -> IResult<&str, ()> {
-    let (input, _) = many1(tuple((opt(fws), comment)))(input)?;
-    let (input, _) = opt(fws)(input)?;
-    Ok((input, ()))
-}
-
-pub fn comment(input: &str) -> IResult<&str, ()> {
-    let (input, _) = tag("(")(input)?;
-    let (input, _) = many0(tuple((opt(fws), ccontent)))(input)?;
-    let (input, _) = opt(fws)(input)?;
-    let (input, _) = tag(")")(input)?;
-    Ok((input, ()))
-}
-
-pub fn ccontent(input: &str) -> IResult<&str, &str> {
-   alt((recognize(ctext), recognize(quoted_pair), recognize(comment)))(input) 
-}
-
-pub fn ctext(input: &str) -> IResult<&str, char> {
-    satisfy(is_ctext)(input)
-}
-
-/// Check if it's a comment text character
-///
-/// ```abnf
-///   ctext           =   %d33-39 /          ; Printable US-ASCII
-///                       %d42-91 /          ;  characters not including
-///                       %d93-126 /         ;  "(", ")", or "\"
-///                       obs-ctext
-///```
-pub fn is_restr_ctext(c: char) -> bool {
-    (c >= '\x21' && c <= '\x27') || (c >= '\x2A' && c <= '\x5B') || (c >= '\x5D' && c <= '\x7E') || !c.is_ascii()
-}
-
-pub fn is_ctext(c: char) -> bool {
-    is_restr_ctext(c) || is_obs_no_ws_ctl(c)
-}
-
-/// US ASCII control characters without effect 
-///
-/// ```abnf
-///   obs-NO-WS-CTL   =   %d1-8 /            ; US-ASCII control
-///                       %d11 /             ;  characters that do not
-///                       %d12 /             ;  include the carriage
-///                       %d14-31 /          ;  return, line feed, and
-///                       %d127              ;  white space characters
-/// ```
-pub fn is_obs_no_ws_ctl(c: char) -> bool {
-    (c >= '\x01' && c <= '\x08') || c == '\x0b' || c == '\x0b' || (c >= '\x0e' && c<= '\x1f') || c == '\x7F'
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_perm_crlf() {
-        assert_eq!(perm_crlf("\rworld"), Ok(("world", "\r")));
-        assert_eq!(perm_crlf("\r\nworld"), Ok(("world", "\r\n")));
-        assert_eq!(perm_crlf("\nworld"), Ok(("world", "\n")));
-    }
-
-    #[test]
-    fn test_fws() {
-        assert_eq!(fws("\r\n world"), Ok(("world", ' ')));
-        assert_eq!(fws(" \r\n \r\n world"), Ok(("world", ' ')));
-        assert_eq!(fws(" world"), Ok(("world", ' ')));
-        assert!(fws("\r\nFrom: test").is_err());
-    }
-
-    #[test]
-    fn test_cfws() {
-        assert_eq!(cfws("(A nice \\) chap) <pete(his account)@silly.test(his host)>"), Ok(("<pete(his account)@silly.test(his host)>", "(A nice \\) chap) ")));
-        assert_eq!(cfws("(Chris's host.)public.example>,"), Ok(("public.example>,", "(Chris's host.)")));
-        assert_eq!(cfws("(double (comment) is fun) wouch"), Ok(("wouch", "(double (comment) is fun) ")));
-    }
-}

src/fragments/words.rs

@@ -1,97 +0,0 @@
-use nom::{
-    IResult,
-    bytes::complete::{tag, take_while1},
-    combinator::{recognize, opt},
-    multi::many0,
-    sequence::{delimited, pair},
-};
-use crate::fragments::whitespace::cfws;
-
-
-/// VCHAR definition
-pub fn is_vchar(c: char) -> bool {
-  (c >= '\x21' && c <= '\x7E') || !c.is_ascii()
-}
-
-/// Sequence of visible chars with the UTF-8 extension
-///
-/// ```abnf
-/// VCHAR   =  %x21-7E
-///            ; visible (printing) characters
-/// VCHAR   =/  UTF8-non-ascii
-/// SEQ     = 1*VCHAR
-///```
-pub fn vchar_seq(input: &str) -> IResult<&str, &str> {
-   take_while1(is_vchar)(input)
-}
-
-/// Atom allowed characters
-fn is_atext(c: char) -> bool {
-    c.is_ascii_alphanumeric() || "!#$%&'*+-/=?^_`{|}~".contains(c) || !c.is_ascii()
-}
-
-/// Atom 
-///
-/// `[CFWS] 1*atext [CFWS]`
-pub fn atom(input: &str) -> IResult<&str, &str> {
-    delimited(opt(cfws), take_while1(is_atext), opt(cfws))(input)
-}
-
-/// dot-atom-text
-///
-/// `1*atext *("." 1*atext)`
-pub fn dot_atom_text(input: &str) -> IResult<&str, &str> {
-    recognize(pair(take_while1(is_atext), many0(pair(tag("."), take_while1(is_atext)))))(input)
-}
-
-/// dot-atom
-///
-/// `[CFWS] dot-atom-text [CFWS]`
-pub fn dot_atom(input: &str) -> IResult<&str, &str> {
-    delimited(opt(cfws), dot_atom_text, opt(cfws))(input)
-}
-
-pub fn is_special(c: char) -> bool {
-    c == '(' || c == ')' || 
-    c == '<' || c == '>' ||
-    c == '[' || c == ']' ||
-    c == ':' || c == ';' ||
-    c == '@' || c == '\\' ||
-    c == ',' || c == '.' ||
-    c == '"'
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_vchar_seq() {
-        assert_eq!(vchar_seq("hello world"), Ok((" world", "hello")));
-        assert_eq!(vchar_seq("hello👋 world"), Ok((" world", "hello👋")));
-    }
-
-    #[test]
-    fn test_atext() {
-        assert!(is_atext('='));
-        assert!(is_atext('5'));
-        assert!(is_atext('Q'));
-        assert!(!is_atext(' '));
-        assert!(is_atext('É')); // support utf8
-    }
-
-    #[test]
-    fn test_atom() {
-        assert_eq!(atom("(skip)  imf_codec (hidden) aerogramme"), Ok(("aerogramme", "imf_codec")));
-    }
-
-    #[test]
-    fn test_dot_atom_text() {
-        assert_eq!(dot_atom_text("quentin.dufour.io abcdef"), Ok((" abcdef", "quentin.dufour.io")));
-    }
-
-    #[test]
-    fn test_dot_atom() {
-        assert_eq!(dot_atom("   (skip) quentin.dufour.io abcdef"), Ok(("abcdef", "quentin.dufour.io")));
-    }
-}

src/header.rs

@@ -0,0 +1,73 @@
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take_while1},
+    character::complete::space0,
+    combinator::{into, recognize},
+    multi::many0,
+    sequence::{pair, terminated, tuple},
+    IResult,
+};
+use std::fmt;
+
+use crate::text::misc_token::unstructured;
+use crate::text::whitespace::{foldable_line, obs_crlf};
+
+#[derive(PartialEq, Clone)]
+pub struct Kv2<'a>(pub &'a [u8], pub &'a [u8]);
+impl<'a> From<(&'a [u8], &'a [u8])> for Kv2<'a> {
+    fn from(pair: (&'a [u8], &'a [u8])) -> Self {
+        Self(pair.0, pair.1)
+    }
+}
+impl<'a> fmt::Debug for Kv2<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("header::Kv2")
+            .field(&String::from_utf8_lossy(self.0))
+            .field(&String::from_utf8_lossy(self.1))
+            .finish()
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Field<'a> {
+    Good(Kv2<'a>),
+    Bad(&'a [u8]),
+}
+impl<'a> From<Kv2<'a>> for Field<'a> {
+    fn from(kv: Kv2<'a>) -> Self {
+        Self::Good(kv)
+    }
+}
+impl<'a> From<&'a [u8]> for Field<'a> {
+    fn from(bad: &'a [u8]) -> Self {
+        Self::Bad(bad)
+    }
+}
+
+/// Parse headers as key/values
+pub fn header_kv(input: &[u8]) -> IResult<&[u8], Vec<Field>> {
+    terminated(
+        many0(alt((into(correct_field), into(foldable_line)))),
+        obs_crlf,
+    )(input)
+}
+
+pub fn field_any(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    terminated(
+        take_while1(|c| (0x21..=0x7E).contains(&c) && c != 0x3A),
+        tuple((space0, tag(b":"), space0)),
+    )(input)
+}
+
+/// Optional field
+///
+/// ```abnf
+/// field      =   field-name ":" unstructured CRLF
+/// field-name =   1*ftext
+/// ftext      =   %d33-57 /          ; Printable US-ASCII
+///                %d59-126           ;  characters not including
+///                                   ;  ":".
+/// ```
+pub fn correct_field(input: &[u8]) -> IResult<&[u8], Kv2> {
+    terminated(into(pair(field_any, recognize(unstructured))), obs_crlf)(input)
+}

src/imf/address.rs

@@ -0,0 +1,246 @@
+use nom::{
+    branch::alt,
+    bytes::complete::tag,
+    combinator::{into, map, opt},
+    multi::separated_list1,
+    sequence::tuple,
+    IResult,
+};
+
+//use crate::error::IMFError;
+use crate::imf::mailbox::{mailbox, MailboxRef};
+use crate::text::misc_token::{phrase, Phrase};
+use crate::text::whitespace::cfws;
+
+#[derive(Debug, PartialEq)]
+pub struct GroupRef<'a> {
+    pub name: Phrase<'a>,
+    pub participants: Vec<MailboxRef<'a>>,
+}
+
+#[derive(Debug, PartialEq)]
+pub enum AddressRef<'a> {
+    Single(MailboxRef<'a>),
+    Many(GroupRef<'a>),
+}
+impl<'a> From<MailboxRef<'a>> for AddressRef<'a> {
+    fn from(mx: MailboxRef<'a>) -> Self {
+        AddressRef::Single(mx)
+    }
+}
+impl<'a> From<GroupRef<'a>> for AddressRef<'a> {
+    fn from(grp: GroupRef<'a>) -> Self {
+        AddressRef::Many(grp)
+    }
+}
+pub type AddressList<'a> = Vec<AddressRef<'a>>;
+
+/// Address (section 3.4 of RFC5322)
+///
+/// ```abnf
+///    address         =   mailbox / group
+/// ```
+pub fn address(input: &[u8]) -> IResult<&[u8], AddressRef> {
+    alt((into(mailbox), into(group)))(input)
+}
+
+/// Group
+///
+/// ```abnf
+///    group           =   display-name ":" [group-list] ";" [CFWS]
+///    display-name    =   phrase
+/// ```
+pub fn group(input: &[u8]) -> IResult<&[u8], GroupRef> {
+    let (input, (grp_name, _, grp_list, _, _)) =
+        tuple((phrase, tag(":"), opt(group_list), tag(";"), opt(cfws)))(input)?;
+
+    Ok((
+        input,
+        GroupRef {
+            name: grp_name,
+            participants: grp_list.unwrap_or(vec![]),
+        },
+    ))
+}
+
+/// Group list
+///
+/// ```abnf
+///    group-list      =   mailbox-list / CFWS / obs-group-list
+/// ```
+pub fn group_list(input: &[u8]) -> IResult<&[u8], Vec<MailboxRef>> {
+    alt((mailbox_list, mailbox_cfws))(input)
+}
+
+fn mailbox_cfws(input: &[u8]) -> IResult<&[u8], Vec<MailboxRef>> {
+    let (input, _) = cfws(input)?;
+    Ok((input, vec![]))
+}
+
+/// Mailbox list
+///
+/// ```abnf
+///    mailbox-list    =   (mailbox *("," mailbox)) / obs-mbox-list
+/// ```
+pub fn mailbox_list(input: &[u8]) -> IResult<&[u8], Vec<MailboxRef>> {
+    separated_list1(tag(","), mailbox)(input)
+}
+
+/// Address list
+///
+/// ```abnf
+///   address-list    =   (address *("," address)) / obs-addr-list
+/// ```
+pub fn address_list(input: &[u8]) -> IResult<&[u8], Vec<AddressRef>> {
+    separated_list1(tag(","), address)(input)
+}
+
+pub fn address_list_cfws(input: &[u8]) -> IResult<&[u8], Vec<AddressRef>> {
+    let (input, _) = cfws(input)?;
+    Ok((input, vec![]))
+}
+
+pub fn nullable_address_list(input: &[u8]) -> IResult<&[u8], Vec<AddressRef>> {
+    map(opt(alt((address_list, address_list_cfws))), |v| {
+        v.unwrap_or(vec![])
+    })(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::imf::mailbox::{AddrSpec, Domain, LocalPart, LocalPartToken};
+    use crate::text::misc_token::{Phrase, Word};
+
+    #[test]
+    fn test_mailbox_list() {
+        match mailbox_list(
+            r#"Pete(A nice \) chap) <pete(his account)@silly.test(his host)>"#.as_bytes(),
+        ) {
+            Ok((rest, _)) => assert_eq!(&b""[..], rest),
+            _ => panic!(),
+        };
+
+        match mailbox_list(
+            r#"Mary Smith <mary@x.test>, jdoe@example.org, Who? <one@y.test>, <boss@nil.test>, "Giant; \"Big\" Box" <sysservices@example.net>"#.as_bytes(),
+        ) {
+            Ok((rest, _)) => assert_eq!(&b""[..], rest),
+            _ => panic!(),
+        };
+    }
+
+    #[test]
+    fn test_address_list() {
+        assert_eq!(
+            address_list(
+                r#"A Group:Ed Jones <c@a.test>,joe@where.test,John <jdoe@one.test>;, Mary Smith <mary@x.test>"#.as_bytes()
+            ),
+            Ok((
+                &b""[..],
+                vec![
+                    AddressRef::Many(GroupRef {
+                        name: Phrase(vec![Word::Atom(&b"A"[..]), Word::Atom(&b"Group"[..])]),
+                        participants: vec![
+                            MailboxRef {
+                                name: Some(Phrase(vec![Word::Atom(&b"Ed"[..]), Word::Atom(&b"Jones"[..])])),
+                                addrspec: AddrSpec {
+                                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"c"[..]))]),
+                                    domain: Domain::Atoms(vec![&b"a"[..], &b"test"[..]]),
+                                },
+                            },
+                            MailboxRef {
+                                name: None,
+                                addrspec: AddrSpec {
+                                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"joe"[..]))]),
+                                    domain: Domain::Atoms(vec![&b"where"[..], &b"test"[..]])
+                                },
+                            },
+                            MailboxRef {
+                                name: Some(Phrase(vec![Word::Atom(&b"John"[..])])),
+                                addrspec: AddrSpec {
+                                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"jdoe"[..]))]),
+                                    domain: Domain::Atoms(vec![&b"one"[..], &b"test"[..]])
+                                },
+                            },
+                        ],
+                    }),
+                    AddressRef::Single(MailboxRef {
+                        name: Some(Phrase(vec![Word::Atom(&b"Mary"[..]), Word::Atom(&b"Smith"[..])])),
+                        addrspec: AddrSpec {
+                            local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"mary"[..]))]),
+                            domain: Domain::Atoms(vec![&b"x"[..], &b"test"[..]])
+                        },
+                    }),
+                ]
+            ))
+        );
+    }
+
+    use crate::text::encoding::{EncodedWord, QuotedChunk, QuotedWord};
+    use crate::text::quoted::QuotedString;
+
+    #[test]
+    fn test_strange_groups() {
+        assert_eq!(
+            address_list(
+                br#""Colleagues": "James Smythe" <james@vandelay.com>;, Friends:
+  jane@example.com, =?UTF-8?Q?John_Sm=C3=AEth?= <john@example.com>;"#
+            ),
+            Ok((
+                &b""[..],
+                vec![
+                    AddressRef::Many(GroupRef {
+                        name: Phrase(vec![Word::Quoted(QuotedString(vec![&b"Colleagues"[..]]))]),
+                        participants: vec![MailboxRef {
+                            name: Some(Phrase(vec![Word::Quoted(QuotedString(vec![
+                                &b"James"[..],
+                                &b" "[..],
+                                &b"Smythe"[..]
+                            ]))])),
+                            addrspec: AddrSpec {
+                                local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(
+                                    &b"james"[..]
+                                ))]),
+                                domain: Domain::Atoms(vec![&b"vandelay"[..], &b"com"[..]]),
+                            }
+                        },],
+                    }),
+                    AddressRef::Many(GroupRef {
+                        name: Phrase(vec![Word::Atom(&b"Friends"[..])]),
+                        participants: vec![
+                            MailboxRef {
+                                name: None,
+                                addrspec: AddrSpec {
+                                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(
+                                        &b"jane"[..]
+                                    ))]),
+                                    domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                                }
+                            },
+                            MailboxRef {
+                                name: Some(Phrase(vec![Word::Encoded(EncodedWord::Quoted(
+                                    QuotedWord {
+                                        enc: encoding_rs::UTF_8,
+                                        chunks: vec![
+                                            QuotedChunk::Safe(&b"John"[..]),
+                                            QuotedChunk::Space,
+                                            QuotedChunk::Safe(&b"Sm"[..]),
+                                            QuotedChunk::Encoded(vec![0xc3, 0xae]),
+                                            QuotedChunk::Safe(&b"th"[..]),
+                                        ]
+                                    }
+                                ))])),
+                                addrspec: AddrSpec {
+                                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(
+                                        &b"john"[..]
+                                    ))]),
+                                    domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                                }
+                            },
+                        ]
+                    }),
+                ]
+            ))
+        );
+    }
+}

src/imf/datetime.rs

@@ -0,0 +1,588 @@
+use chrono::{DateTime, FixedOffset, NaiveDate, NaiveTime};
+use nom::{
+    branch::alt,
+    bytes::complete::{is_a, tag, tag_no_case, take_while_m_n},
+    character,
+    character::complete::{alphanumeric1, digit0},
+    combinator::{map, opt, value},
+    sequence::{delimited, preceded, terminated, tuple},
+    IResult,
+};
+
+use crate::text::whitespace::{cfws, fws};
+//use crate::error::IMFError;
+
+const MIN: i32 = 60;
+const HOUR: i32 = 60 * MIN;
+
+/*
+impl<'a> TryFrom<&'a lazy::DateTime<'a>> for DateTime<FixedOffset> {
+    type Error = IMFError<'a>;
+
+    fn try_from(value: &'a lazy::DateTime<'a>) -> Result<Self, Self::Error> {
+        match section(value.0) {
+            Ok((_, Some(dt))) => Ok(dt),
+            Err(e) => Err(IMFError::DateTimeParse(e)),
+            _ => Err(IMFError::DateTimeLogic),
+        }
+    }
+}*/
+
+/// Read datetime
+///
+/// ```abnf
+/// date-time       =   [ day-of-week "," ] date time [CFWS]
+/// time            =   time-of-day zone
+/// ```
+///
+/// ## @FIXME - known bugs
+///  
+///   - if chrono fails, Option::None is silently returned instead of failing the parser
+///   - `-0000` means NaiveDateTime, a date without a timezone
+/// while this library interprets it as +0000 aka UTC.
+///   - Obsolete military zones should be considered as NaiveTime
+/// due to an error in RFC0822 but are interpreted as their respective
+/// timezone according to the RFC5322 definition
+pub fn section(input: &[u8]) -> IResult<&[u8], Option<DateTime<FixedOffset>>> {
+    map(
+        terminated(
+            alt((
+                tuple((
+                    opt(terminated(strict_day_of_week, tag(","))),
+                    strict_date,
+                    strict_time_of_day,
+                    strict_zone,
+                )),
+                tuple((
+                    opt(terminated(obs_day_of_week, tag(","))),
+                    obs_date,
+                    obs_time_of_day,
+                    alt((strict_zone, obs_zone)),
+                )),
+            )),
+            opt(cfws),
+        ),
+        |res| match res {
+            (_, Some(date), Some(time), Some(tz)) => {
+                date.and_time(time).and_local_timezone(tz).earliest()
+            }
+            _ => None,
+        },
+    )(input)
+}
+
+///    day-of-week     =   ([FWS] day-name) / obs-day-of-week
+fn strict_day_of_week(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    preceded(opt(fws), day_name)(input)
+}
+
+///    obs-day-of-week =   [CFWS] day-name [CFWS]
+fn obs_day_of_week(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    delimited(opt(cfws), day_name, opt(cfws))(input)
+}
+
+///   day-name        =   "Mon" / "Tue" / "Wed" / "Thu" /
+///                       "Fri" / "Sat" / "Sun"
+fn day_name(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    alt((
+        tag_no_case(b"Mon"),
+        tag_no_case(b"Tue"),
+        tag_no_case(b"Wed"),
+        tag_no_case(b"Thu"),
+        tag_no_case(b"Fri"),
+        tag_no_case(b"Sat"),
+        tag_no_case(b"Sun"),
+    ))(input)
+}
+
+///    date            =   day month year
+fn strict_date(input: &[u8]) -> IResult<&[u8], Option<NaiveDate>> {
+    map(tuple((strict_day, month, strict_year)), |(d, m, y)| {
+        NaiveDate::from_ymd_opt(y, m, d)
+    })(input)
+}
+
+///    date            =   day month year
+fn obs_date(input: &[u8]) -> IResult<&[u8], Option<NaiveDate>> {
+    map(tuple((obs_day, month, obs_year)), |(d, m, y)| {
+        NaiveDate::from_ymd_opt(y, m, d)
+    })(input)
+}
+
+///    day             =   ([FWS] 1*2DIGIT FWS) / obs-day
+fn strict_day(input: &[u8]) -> IResult<&[u8], u32> {
+    delimited(opt(fws), character::complete::u32, fws)(input)
+}
+
+///    obs-day         =   [CFWS] 1*2DIGIT [CFWS]
+fn obs_day(input: &[u8]) -> IResult<&[u8], u32> {
+    delimited(opt(cfws), character::complete::u32, opt(cfws))(input)
+}
+
+///  month           =   "Jan" / "Feb" / "Mar" / "Apr" /
+///                      "May" / "Jun" / "Jul" / "Aug" /
+///                      "Sep" / "Oct" / "Nov" / "Dec"
+fn month(input: &[u8]) -> IResult<&[u8], u32> {
+    alt((
+        value(1, tag_no_case(b"Jan")),
+        value(2, tag_no_case(b"Feb")),
+        value(3, tag_no_case(b"Mar")),
+        value(4, tag_no_case(b"Apr")),
+        value(5, tag_no_case(b"May")),
+        value(6, tag_no_case(b"Jun")),
+        value(7, tag_no_case(b"Jul")),
+        value(8, tag_no_case(b"Aug")),
+        value(9, tag_no_case(b"Sep")),
+        value(10, tag_no_case(b"Oct")),
+        value(11, tag_no_case(b"Nov")),
+        value(12, tag_no_case(b"Dec")),
+    ))(input)
+}
+
+///   year            =   (FWS 4*DIGIT FWS) / obs-year
+fn strict_year(input: &[u8]) -> IResult<&[u8], i32> {
+    delimited(
+        fws,
+        map(
+            terminated(take_while_m_n(4, 9, |c| (0x30..=0x39).contains(&c)), digit0),
+            |d: &[u8]| {
+                encoding_rs::UTF_8
+                    .decode_without_bom_handling(d)
+                    .0
+                    .parse::<i32>()
+                    .unwrap_or(0)
+            },
+        ),
+        fws,
+    )(input)
+}
+
+///   obs-year        =   [CFWS] 2*DIGIT [CFWS]
+fn obs_year(input: &[u8]) -> IResult<&[u8], i32> {
+    map(
+        delimited(
+            opt(cfws),
+            terminated(take_while_m_n(2, 7, |c| (0x30..=0x39).contains(&c)), digit0),
+            opt(cfws),
+        ),
+        |cap: &[u8]| {
+            let year_txt = encoding_rs::UTF_8.decode_without_bom_handling(cap).0;
+            let d = year_txt.parse::<i32>().unwrap_or(0);
+            if (0..=49).contains(&d) {
+                2000 + d
+            } else if (50..=999).contains(&d) {
+                1900 + d
+            } else {
+                d
+            }
+        },
+    )(input)
+}
+
+///   time-of-day     =   hour ":" minute [ ":" second ]
+fn strict_time_of_day(input: &[u8]) -> IResult<&[u8], Option<NaiveTime>> {
+    map(
+        tuple((
+            strict_time_digit,
+            tag(":"),
+            strict_time_digit,
+            opt(preceded(tag(":"), strict_time_digit)),
+        )),
+        |(hour, _, minute, maybe_sec)| {
+            NaiveTime::from_hms_opt(hour, minute, maybe_sec.unwrap_or(0))
+        },
+    )(input)
+}
+
+///   time-of-day     =   hour ":" minute [ ":" second ]
+fn obs_time_of_day(input: &[u8]) -> IResult<&[u8], Option<NaiveTime>> {
+    map(
+        tuple((
+            obs_time_digit,
+            tag(":"),
+            obs_time_digit,
+            opt(preceded(tag(":"), obs_time_digit)),
+        )),
+        |(hour, _, minute, maybe_sec)| {
+            NaiveTime::from_hms_opt(hour, minute, maybe_sec.unwrap_or(0))
+        },
+    )(input)
+}
+
+fn strict_time_digit(input: &[u8]) -> IResult<&[u8], u32> {
+    character::complete::u32(input)
+}
+
+fn obs_time_digit(input: &[u8]) -> IResult<&[u8], u32> {
+    delimited(opt(cfws), character::complete::u32, opt(cfws))(input)
+}
+
+/// Obsolete zones
+///
+/// ```abnf
+///   zone            =   (FWS ( "+" / "-" ) 4DIGIT) / (FWS obs-zone)
+/// ```
+fn strict_zone(input: &[u8]) -> IResult<&[u8], Option<FixedOffset>> {
+    map(
+        tuple((
+            opt(fws),
+            is_a("+-"),
+            take_while_m_n(2, 2, |c| (0x30..=0x39).contains(&c)),
+            take_while_m_n(2, 2, |c| (0x30..=0x39).contains(&c)),
+        )),
+        |(_, op, dig_zone_hour, dig_zone_min)| {
+            let zone_hour: i32 =
+                ((dig_zone_hour[0] - 0x30) * 10 + (dig_zone_hour[1] - 0x30)) as i32 * HOUR;
+            let zone_min: i32 =
+                ((dig_zone_min[0] - 0x30) * 10 + (dig_zone_min[1] - 0x30)) as i32 * MIN;
+            match op {
+                b"+" => FixedOffset::east_opt(zone_hour + zone_min),
+                b"-" => FixedOffset::west_opt(zone_hour + zone_min),
+                _ => unreachable!(),
+            }
+        },
+    )(input)
+}
+
+/// obsole zone
+///
+///   obs-zone        =   "UT" / "GMT" /     ; Universal Time
+///                                          ; North American UT
+///                                          ; offsets
+///                       "EST" / "EDT" /    ; Eastern:  - 5/ - 4
+///                       "CST" / "CDT" /    ; Central:  - 6/ - 5
+///                       "MST" / "MDT" /    ; Mountain: - 7/ - 6
+///                       "PST" / "PDT" /    ; Pacific:  - 8/ - 7
+///                                          ;
+///                       %d65-73 /          ; Military zones - "A"
+///                       %d75-90 /          ; through "I" and "K"
+///                       %d97-105 /         ; through "Z", both
+///                       %d107-122 /        ; upper and lower case
+///                                          ;
+///                       1*(ALPHA / DIGIT)  ; Unknown legacy timezones
+fn obs_zone(input: &[u8]) -> IResult<&[u8], Option<FixedOffset>> {
+    // The writing of this function is volontarily verbose
+    // to keep it straightforward to understand.
+    // @FIXME: Could return a TimeZone and not an Option<TimeZone>
+    // as it could be determined at compile time if values are correct
+    // and panic at this time if not. But not sure how to do it without unwrap.
+    preceded(
+        opt(fws),
+        alt((
+            // Legacy UTC/GMT
+            value(
+                FixedOffset::west_opt(0 * HOUR),
+                alt((tag_no_case(b"UTC"), tag_no_case(b"UT"), tag_no_case(b"GMT"))),
+            ),
+            // USA Timezones
+            value(FixedOffset::west_opt(4 * HOUR), tag_no_case(b"EDT")),
+            value(
+                FixedOffset::west_opt(5 * HOUR),
+                alt((tag_no_case(b"EST"), tag_no_case(b"CDT"))),
+            ),
+            value(
+                FixedOffset::west_opt(6 * HOUR),
+                alt((tag_no_case(b"CST"), tag_no_case(b"MDT"))),
+            ),
+            value(
+                FixedOffset::west_opt(7 * HOUR),
+                alt((tag_no_case(b"MST"), tag_no_case(b"PDT"))),
+            ),
+            value(FixedOffset::west_opt(8 * HOUR), tag_no_case(b"PST")),
+            // Military Timezone UTC
+            value(FixedOffset::west_opt(0 * HOUR), tag_no_case(b"Z")),
+            // Military Timezones East
+            alt((
+                value(FixedOffset::east_opt(HOUR), tag_no_case(b"A")),
+                value(FixedOffset::east_opt(2 * HOUR), tag_no_case(b"B")),
+                value(FixedOffset::east_opt(3 * HOUR), tag_no_case(b"C")),
+                value(FixedOffset::east_opt(4 * HOUR), tag_no_case(b"D")),
+                value(FixedOffset::east_opt(5 * HOUR), tag_no_case(b"E")),
+                value(FixedOffset::east_opt(6 * HOUR), tag_no_case(b"F")),
+                value(FixedOffset::east_opt(7 * HOUR), tag_no_case(b"G")),
+                value(FixedOffset::east_opt(8 * HOUR), tag_no_case(b"H")),
+                value(FixedOffset::east_opt(9 * HOUR), tag_no_case(b"I")),
+                value(FixedOffset::east_opt(10 * HOUR), tag_no_case(b"K")),
+                value(FixedOffset::east_opt(11 * HOUR), tag_no_case(b"L")),
+                value(FixedOffset::east_opt(12 * HOUR), tag_no_case(b"M")),
+            )),
+            // Military Timezones West
+            alt((
+                value(FixedOffset::west_opt(HOUR), tag_no_case(b"N")),
+                value(FixedOffset::west_opt(2 * HOUR), tag_no_case(b"O")),
+                value(FixedOffset::west_opt(3 * HOUR), tag_no_case(b"P")),
+                value(FixedOffset::west_opt(4 * HOUR), tag_no_case(b"Q")),
+                value(FixedOffset::west_opt(5 * HOUR), tag_no_case(b"R")),
+                value(FixedOffset::west_opt(6 * HOUR), tag_no_case(b"S")),
+                value(FixedOffset::west_opt(7 * HOUR), tag_no_case(b"T")),
+                value(FixedOffset::west_opt(8 * HOUR), tag_no_case(b"U")),
+                value(FixedOffset::west_opt(9 * HOUR), tag_no_case(b"V")),
+                value(FixedOffset::west_opt(10 * HOUR), tag_no_case(b"W")),
+                value(FixedOffset::west_opt(11 * HOUR), tag_no_case(b"X")),
+                value(FixedOffset::west_opt(12 * HOUR), tag_no_case(b"Y")),
+            )),
+            // Unknown timezone
+            value(FixedOffset::west_opt(0 * HOUR), alphanumeric1),
+        )),
+    )(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::TimeZone;
+
+    #[test]
+    fn test_section_rfc_strict() {
+        assert_eq!(
+            section(b"Fri, 21 Nov 1997 09:55:06 -0600"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::west_opt(6 * HOUR)
+                        .unwrap()
+                        .with_ymd_and_hms(1997, 11, 21, 9, 55, 6)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_received() {
+        assert_eq!(
+            section(b"Sun, 18 Jun 2023 15:39:08 +0200 (CEST)"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(2 * HOUR)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 6, 18, 15, 39, 8)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_rfc_ws() {
+        assert_eq!(
+            section(
+                r#"Thu,
+         13
+           Feb
+             1969
+         23:32
+                  -0330 (Newfoundland Time)"#
+                    .as_bytes()
+            ),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::west_opt(3 * HOUR + 30 * MIN)
+                        .unwrap()
+                        .with_ymd_and_hms(1969, 2, 13, 23, 32, 00)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_rfc_obs() {
+        assert_eq!(
+            section(b"21 Nov 97 09:55:06 GMT"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(1997, 11, 21, 9, 55, 6)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_3digit_year() {
+        assert_eq!(
+            section(b"21 Nov 103 09:55:06 UT"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2003, 11, 21, 9, 55, 6)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_rfc_obs_ws() {
+        assert_eq!(
+            section(b"Fri, 21 Nov 1997 09(comment):   55  :  06 -0600"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::west_opt(6 * HOUR)
+                        .unwrap()
+                        .with_ymd_and_hms(1997, 11, 21, 9, 55, 6)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_2digit_year() {
+        assert_eq!(
+            section(b"21 Nov 23 09:55:06Z"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 9, 55, 6)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_military_zone_east() {
+        ["a", "B", "c", "D", "e", "F", "g", "H", "i", "K", "l", "M"]
+            .iter()
+            .enumerate()
+            .for_each(|(i, x)| {
+                assert_eq!(
+                    section(format!("1 Jan 22 08:00:00 {}", x).as_bytes()),
+                    Ok((
+                        &b""[..],
+                        Some(
+                            FixedOffset::east_opt((i as i32 + 1) * HOUR)
+                                .unwrap()
+                                .with_ymd_and_hms(2022, 01, 01, 8, 0, 0)
+                                .unwrap()
+                        )
+                    ))
+                );
+            });
+    }
+
+    #[test]
+    fn test_section_military_zone_west() {
+        ["N", "O", "P", "q", "r", "s", "T", "U", "V", "w", "x", "y"]
+            .iter()
+            .enumerate()
+            .for_each(|(i, x)| {
+                assert_eq!(
+                    section(format!("1 Jan 22 08:00:00 {}", x).as_bytes()),
+                    Ok((
+                        &b""[..],
+                        Some(
+                            FixedOffset::west_opt((i as i32 + 1) * HOUR)
+                                .unwrap()
+                                .with_ymd_and_hms(2022, 01, 01, 8, 0, 0)
+                                .unwrap()
+                        )
+                    ))
+                );
+            });
+    }
+
+    #[test]
+    fn test_section_gmt() {
+        assert_eq!(
+            section(b"21 Nov 2023 07:07:07 +0000"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 7, 7, 7)
+                        .unwrap()
+                )
+            )),
+        );
+        assert_eq!(
+            section(b"21 Nov 2023 07:07:07 -0000"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 7, 7, 7)
+                        .unwrap()
+                )
+            )),
+        );
+        assert_eq!(
+            section(b"21 Nov 2023 07:07:07 Z"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 7, 7, 7)
+                        .unwrap()
+                )
+            )),
+        );
+        assert_eq!(
+            section(b"21 Nov 2023 07:07:07 GMT"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 7, 7, 7)
+                        .unwrap()
+                )
+            )),
+        );
+        assert_eq!(
+            section(b"21 Nov 2023 07:07:07 UT"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 7, 7, 7)
+                        .unwrap()
+                )
+            )),
+        );
+        assert_eq!(
+            section(b"21 Nov 2023 07:07:07 UTC"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::east_opt(0)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 7, 7, 7)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+
+    #[test]
+    fn test_section_usa() {
+        assert_eq!(
+            section(b"21 Nov 2023 4:4:4 CST"),
+            Ok((
+                &b""[..],
+                Some(
+                    FixedOffset::west_opt(6 * HOUR)
+                        .unwrap()
+                        .with_ymd_and_hms(2023, 11, 21, 4, 4, 4)
+                        .unwrap()
+                )
+            )),
+        );
+    }
+}

src/imf/field.rs

@@ -0,0 +1,75 @@
+use chrono::{DateTime, FixedOffset};
+use nom::combinator::map;
+
+use crate::header;
+use crate::imf::address::{address_list, mailbox_list, nullable_address_list, AddressList};
+use crate::imf::datetime::section as date;
+use crate::imf::identification::{msg_id, msg_list, MessageID, MessageIDList};
+use crate::imf::mailbox::{mailbox, AddrSpec, MailboxList, MailboxRef};
+use crate::imf::mime::{version, Version};
+use crate::imf::trace::{received_log, return_path, ReceivedLog};
+use crate::text::misc_token::{phrase_list, unstructured, PhraseList, Unstructured};
+
+#[derive(Debug, PartialEq)]
+pub enum Field<'a> {
+    // 3.6.1.  The Origination Date Field
+    Date(Option<DateTime<FixedOffset>>),
+
+    // 3.6.2.  Originator Fields
+    From(MailboxList<'a>),
+    Sender(MailboxRef<'a>),
+    ReplyTo(AddressList<'a>),
+
+    // 3.6.3.  Destination Address Fields
+    To(AddressList<'a>),
+    Cc(AddressList<'a>),
+    Bcc(AddressList<'a>),
+
+    // 3.6.4.  Identification Fields
+    MessageID(MessageID<'a>),
+    InReplyTo(MessageIDList<'a>),
+    References(MessageIDList<'a>),
+
+    // 3.6.5.  Informational Fields
+    Subject(Unstructured<'a>),
+    Comments(Unstructured<'a>),
+    Keywords(PhraseList<'a>),
+
+    // 3.6.6   Resent Fields (not implemented)
+    // 3.6.7   Trace Fields
+    Received(ReceivedLog<'a>),
+    ReturnPath(Option<AddrSpec<'a>>),
+
+    MIMEVersion(Version),
+}
+impl<'a> TryFrom<&header::Field<'a>> for Field<'a> {
+    type Error = ();
+    fn try_from(f: &header::Field<'a>) -> Result<Self, Self::Error> {
+        let content = match f {
+            header::Field::Good(header::Kv2(key, value)) => {
+                match key.to_ascii_lowercase().as_slice() {
+                    b"date" => map(date, Field::Date)(value),
+                    b"from" => map(mailbox_list, Field::From)(value),
+                    b"sender" => map(mailbox, Field::Sender)(value),
+                    b"reply-to" => map(address_list, Field::ReplyTo)(value),
+                    b"to" => map(address_list, Field::To)(value),
+                    b"cc" => map(address_list, Field::Cc)(value),
+                    b"bcc" => map(nullable_address_list, Field::Bcc)(value),
+                    b"message-id" => map(msg_id, Field::MessageID)(value),
+                    b"in-reply-to" => map(msg_list, Field::InReplyTo)(value),
+                    b"references" => map(msg_list, Field::References)(value),
+                    b"subject" => map(unstructured, Field::Subject)(value),
+                    b"comments" => map(unstructured, Field::Comments)(value),
+                    b"keywords" => map(phrase_list, Field::Keywords)(value),
+                    b"return-path" => map(return_path, Field::ReturnPath)(value),
+                    b"received" => map(received_log, Field::Received)(value),
+                    b"mime-version" => map(version, Field::MIMEVersion)(value),
+                    _ => return Err(()),
+                }
+            }
+            _ => return Err(()),
+        };
+
+        content.map(|(_, content)| content).or(Err(()))
+    }
+}

src/imf/identification.rs

@@ -0,0 +1,87 @@
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take_while},
+    combinator::opt,
+    multi::many1,
+    sequence::{delimited, pair, tuple},
+    IResult,
+};
+use std::fmt;
+
+use crate::imf::mailbox::is_dtext;
+use crate::text::whitespace::cfws;
+use crate::text::words::dot_atom_text;
+
+#[derive(PartialEq, Clone)]
+pub struct MessageID<'a> {
+    pub left: &'a [u8],
+    pub right: &'a [u8],
+}
+impl<'a> ToString for MessageID<'a> {
+    fn to_string(&self) -> String {
+        format!(
+            "{}@{}",
+            String::from_utf8_lossy(self.left),
+            String::from_utf8_lossy(self.right)
+        )
+    }
+}
+impl<'a> fmt::Debug for MessageID<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("MessageID")
+            .field(&format_args!("\"{}\"", self.to_string()))
+            .finish()
+    }
+}
+pub type MessageIDList<'a> = Vec<MessageID<'a>>;
+
+/// Message identifier
+///
+/// ```abnf
+///    msg-id          =   [CFWS] "<" id-left "@" id-right ">" [CFWS]
+/// ```
+pub fn msg_id(input: &[u8]) -> IResult<&[u8], MessageID> {
+    let (input, (left, _, right)) = delimited(
+        pair(opt(cfws), tag("<")),
+        tuple((id_left, tag("@"), id_right)),
+        pair(tag(">"), opt(cfws)),
+    )(input)?;
+    Ok((input, MessageID { left, right }))
+}
+
+pub fn msg_list(input: &[u8]) -> IResult<&[u8], MessageIDList> {
+    many1(msg_id)(input)
+}
+
+// @FIXME Missing obsolete
+fn id_left(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    dot_atom_text(input)
+}
+
+// @FIXME Missing obsolete
+fn id_right(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    alt((dot_atom_text, no_fold_litteral))(input)
+}
+
+fn no_fold_litteral(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    delimited(tag("["), take_while(is_dtext), tag("]"))(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_msg_id() {
+        assert_eq!(
+            msg_id(b"<5678.21-Nov-1997@example.com>"),
+            Ok((
+                &b""[..],
+                MessageID {
+                    left: &b"5678.21-Nov-1997"[..],
+                    right: &b"example.com"[..],
+                }
+            )),
+        );
+    }
+}

src/imf/mailbox.rs

@@ -0,0 +1,595 @@
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take_while1},
+    combinator::{into, map, opt},
+    multi::{many0, separated_list1},
+    sequence::{delimited, pair, preceded, terminated, tuple},
+    IResult,
+};
+use std::fmt;
+
+use crate::text::ascii;
+use crate::text::misc_token::{phrase, word, Phrase, Word};
+use crate::text::whitespace::{cfws, fws, is_obs_no_ws_ctl};
+use crate::text::words::atom;
+
+#[derive(PartialEq)]
+pub struct AddrSpec<'a> {
+    pub local_part: LocalPart<'a>,
+    pub domain: Domain<'a>,
+}
+impl<'a> ToString for AddrSpec<'a> {
+    fn to_string(&self) -> String {
+        format!(
+            "{}@{}",
+            self.local_part.to_string(),
+            self.domain.to_string()
+        )
+    }
+}
+impl<'a> fmt::Debug for AddrSpec<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("AddrSpec")
+            .field(&format_args!("\"{}\"", self.to_string()))
+            .finish()
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub struct MailboxRef<'a> {
+    // The actual "email address" like hello@example.com
+    pub addrspec: AddrSpec<'a>,
+    pub name: Option<Phrase<'a>>,
+}
+impl<'a> ToString for MailboxRef<'a> {
+    fn to_string(&self) -> String {
+        match &self.name {
+            Some(n) => format!("{} <{}>", n.to_string(), self.addrspec.to_string()),
+            None => self.addrspec.to_string(),
+        }
+    }
+}
+impl<'a> From<AddrSpec<'a>> for MailboxRef<'a> {
+    fn from(addr: AddrSpec<'a>) -> Self {
+        MailboxRef {
+            name: None,
+            addrspec: addr,
+        }
+    }
+}
+pub type MailboxList<'a> = Vec<MailboxRef<'a>>;
+
+/// Mailbox
+///
+/// ```abnf
+///    mailbox         =   name-addr / addr-spec
+/// ```
+pub fn mailbox(input: &[u8]) -> IResult<&[u8], MailboxRef> {
+    alt((name_addr, into(addr_spec)))(input)
+}
+
+/// Name of the email address
+///
+/// ```abnf
+///    name-addr       =   [display-name] angle-addr
+/// ```
+fn name_addr(input: &[u8]) -> IResult<&[u8], MailboxRef> {
+    let (input, name) = opt(phrase)(input)?;
+    let (input, addrspec) = angle_addr(input)?;
+    Ok((input, MailboxRef { name, addrspec }))
+}
+
+/// Enclosed addr-spec with < and >
+///
+/// ```abnf
+/// angle-addr      =   [CFWS] "<" addr-spec ">" [CFWS] /
+///                     obs-angle-addr
+/// ```
+pub fn angle_addr(input: &[u8]) -> IResult<&[u8], AddrSpec> {
+    delimited(
+        tuple((opt(cfws), tag(&[ascii::LT]), opt(obs_route))),
+        addr_spec,
+        pair(tag(&[ascii::GT]), opt(cfws)),
+    )(input)
+}
+
+///    obs-route       =   obs-domain-list ":"
+fn obs_route(input: &[u8]) -> IResult<&[u8], Vec<Option<Domain>>> {
+    terminated(obs_domain_list, tag(&[ascii::COL]))(input)
+}
+
+/// ```abnf
+///    obs-domain-list =   *(CFWS / ",") "@" domain
+///                        *("," [CFWS] ["@" domain])
+/// ```
+fn obs_domain_list(input: &[u8]) -> IResult<&[u8], Vec<Option<Domain>>> {
+    preceded(
+        many0(cfws),
+        separated_list1(
+            tag(&[ascii::COMMA]),
+            preceded(many0(cfws), opt(preceded(tag(&[ascii::AT]), obs_domain))),
+        ),
+    )(input)
+}
+
+/// AddrSpec
+///
+/// ```abnf
+///    addr-spec       =   local-part "@" domain
+/// ```
+/// @FIXME: this system does not work to alternate between strict and obsolete
+/// so I force obsolete for now...
+pub fn addr_spec(input: &[u8]) -> IResult<&[u8], AddrSpec> {
+    map(
+        tuple((
+            obs_local_part,
+            tag(&[ascii::AT]),
+            obs_domain,
+            many0(pair(tag(&[ascii::AT]), obs_domain)), // for compatibility reasons with ENRON
+        )),
+        |(local_part, _, domain, _)| AddrSpec { local_part, domain },
+    )(input)
+}
+
+#[derive(Debug, PartialEq)]
+pub enum LocalPartToken<'a> {
+    Dot,
+    Word(Word<'a>),
+}
+
+#[derive(Debug, PartialEq)]
+pub struct LocalPart<'a>(pub Vec<LocalPartToken<'a>>);
+
+impl<'a> LocalPart<'a> {
+    pub fn to_string(&self) -> String {
+        self.0.iter().fold(String::new(), |mut acc, token| {
+            match token {
+                LocalPartToken::Dot => acc.push('.'),
+                LocalPartToken::Word(v) => acc.push_str(v.to_string().as_ref()),
+            }
+            acc
+        })
+    }
+}
+
+/// Obsolete local part
+///
+/// Compared to the RFC, we allow multiple dots.
+/// This is found in Enron emails and supported by Gmail.
+///
+/// Obsolete local part is a superset of strict_local_part:
+/// anything that is parsed by strict_local_part will be parsed by
+/// obs_local_part.
+///
+/// ```abnf
+/// obs-local-part  =  *("." / word)
+/// ```
+fn obs_local_part(input: &[u8]) -> IResult<&[u8], LocalPart> {
+    map(
+        many0(alt((
+            map(tag(&[ascii::PERIOD]), |_| LocalPartToken::Dot),
+            map(word, LocalPartToken::Word),
+        ))),
+        LocalPart,
+    )(input)
+}
+
+#[derive(PartialEq)]
+pub enum Domain<'a> {
+    Atoms(Vec<&'a [u8]>),
+    Litteral(Vec<&'a [u8]>),
+}
+
+impl<'a> ToString for Domain<'a> {
+    fn to_string(&self) -> String {
+        match self {
+            Domain::Atoms(v) => v
+                .iter()
+                .map(|v| {
+                    encoding_rs::UTF_8
+                        .decode_without_bom_handling(v)
+                        .0
+                        .to_string()
+                })
+                .collect::<Vec<String>>()
+                .join("."),
+            Domain::Litteral(v) => {
+                let inner = v
+                    .iter()
+                    .map(|v| {
+                        encoding_rs::UTF_8
+                            .decode_without_bom_handling(v)
+                            .0
+                            .to_string()
+                    })
+                    .collect::<Vec<String>>()
+                    .join(" ");
+                format!("[{}]", inner)
+            }
+        }
+    }
+}
+impl<'a> fmt::Debug for Domain<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("Domain")
+            .field(&format_args!("\"{}\"", self.to_string()))
+            .finish()
+    }
+}
+
+/// Obsolete domain
+///
+/// Rewritten so that obs_domain is a superset
+/// of strict_domain.
+///
+/// ```abnf
+///  obs-domain      =   atom *("." atom) / domain-literal
+/// ```
+pub fn obs_domain(input: &[u8]) -> IResult<&[u8], Domain> {
+    alt((
+        map(separated_list1(tag("."), atom), Domain::Atoms),
+        domain_litteral,
+    ))(input)
+}
+
+/// Domain litteral
+///
+/// ```abnf
+///    domain-literal  =   [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
+/// ```
+fn domain_litteral(input: &[u8]) -> IResult<&[u8], Domain> {
+    delimited(
+        pair(opt(cfws), tag(&[ascii::LEFT_BRACKET])),
+        inner_domain_litteral,
+        pair(tag(&[ascii::RIGHT_BRACKET]), opt(cfws)),
+    )(input)
+}
+
+fn inner_domain_litteral(input: &[u8]) -> IResult<&[u8], Domain> {
+    map(
+        terminated(many0(preceded(opt(fws), take_while1(is_dtext))), opt(fws)),
+        Domain::Litteral,
+    )(input)
+}
+
+fn is_strict_dtext(c: u8) -> bool {
+    (0x21..=0x5A).contains(&c) || (0x5E..=0x7E).contains(&c)
+}
+
+/// Is domain text
+///
+/// ```abnf
+///   dtext           =   %d33-90 /          ; Printable US-ASCII
+///                       %d94-126 /         ;  characters not including
+///                       obs-dtext          ;  "[", "]", or "\"
+///   obs-dtext       =   obs-NO-WS-CTL / quoted-pair
+/// ```
+pub fn is_dtext(c: u8) -> bool {
+    is_strict_dtext(c) || is_obs_no_ws_ctl(c)
+    //@FIXME does not support quoted pair yet while RFC requires it
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::text::quoted::QuotedString;
+
+    #[test]
+    fn test_addr_spec() {
+        assert_eq!(
+            addr_spec(b"alice@example.com"),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"alice"[..]))]),
+                    domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                }
+            ))
+        );
+
+        assert_eq!(
+            addr_spec(b"jsmith@[192.168.2.1]").unwrap().1.to_string(),
+            "jsmith@[192.168.2.1]".to_string(),
+        );
+        assert_eq!(
+            addr_spec(b"jsmith@[IPv6:2001:db8::1]")
+                .unwrap()
+                .1
+                .to_string(),
+            "jsmith@[IPv6:2001:db8::1]".to_string(),
+        );
+
+        // UTF-8
+        // @FIXME ASCII SUPPORT IS BROKEN
+        /*assert_eq!(
+            addr_spec("用户@例子.广告"),
+            Ok((
+                "",
+                AddrSpec {
+                    local_part: "用户".into(),
+                    domain: "例子.广告".into()
+                }
+            ))
+        );*/
+
+        // ASCII Edge cases
+        assert_eq!(
+            addr_spec(b"user+mailbox/department=shipping@example.com")
+                .unwrap()
+                .1
+                .to_string(),
+            "user+mailbox/department=shipping@example.com".to_string(),
+        );
+
+        assert_eq!(
+            addr_spec(b"!#$%&'*+-/=?^_`.{|}~@example.com")
+                .unwrap()
+                .1
+                .to_string(),
+            "!#$%&'*+-/=?^_`.{|}~@example.com".to_string(),
+        );
+
+        assert_eq!(
+            addr_spec(r#""Abc@def"@example.com"#.as_bytes()),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Quoted(QuotedString(
+                        vec![b"Abc@def"]
+                    )))]),
+                    domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                }
+            ))
+        );
+        assert_eq!(
+            addr_spec(r#""Fred\ Bloggs"@example.com"#.as_bytes()),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Quoted(QuotedString(
+                        vec![b"Fred", b" ", b"Bloggs"]
+                    )))]),
+                    domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                }
+            ))
+        );
+        assert_eq!(
+            addr_spec(r#""Joe.\\Blow"@example.com"#.as_bytes()),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![LocalPartToken::Word(Word::Quoted(QuotedString(
+                        vec![b"Joe.", &[ascii::BACKSLASH], b"Blow"]
+                    )))]),
+                    domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                }
+            ))
+        );
+    }
+
+    #[test]
+    fn test_mailbox() {
+        assert_eq!(
+            mailbox(r#""Joe Q. Public" <john.q.public@example.com>"#.as_bytes()),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: Some(Phrase(vec![Word::Quoted(QuotedString(vec![
+                        &b"Joe"[..],
+                        &[ascii::SP],
+                        &b"Q."[..],
+                        &[ascii::SP],
+                        &b"Public"[..]
+                    ]))])),
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![
+                            LocalPartToken::Word(Word::Atom(&b"john"[..])),
+                            LocalPartToken::Dot,
+                            LocalPartToken::Word(Word::Atom(&b"q"[..])),
+                            LocalPartToken::Dot,
+                            LocalPartToken::Word(Word::Atom(&b"public"[..])),
+                        ]),
+                        domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                    }
+                }
+            ))
+        );
+
+        assert_eq!(
+            mailbox(r#"Mary Smith <mary@x.test>"#.as_bytes()),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: Some(Phrase(vec![
+                        Word::Atom(&b"Mary"[..]),
+                        Word::Atom(&b"Smith"[..])
+                    ])),
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"mary"[..]))]),
+                        domain: Domain::Atoms(vec![&b"x"[..], &b"test"[..]]),
+                    }
+                }
+            ))
+        );
+
+        assert_eq!(
+            mailbox(r#"jdoe@example.org"#.as_bytes()),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: None,
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"jdoe"[..]))]),
+                        domain: Domain::Atoms(vec![&b"example"[..], &b"org"[..]]),
+                    }
+                }
+            ))
+        );
+
+        assert_eq!(
+            mailbox(r#"Who? <one@y.test>"#.as_bytes()),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: Some(Phrase(vec![Word::Atom(&b"Who?"[..])])),
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"one"[..]))]),
+                        domain: Domain::Atoms(vec![&b"y"[..], &b"test"[..]]),
+                    }
+                }
+            ))
+        );
+
+        assert_eq!(
+            mailbox(r#"<boss@nil.test>"#.as_bytes()),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: None,
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"boss"[..]))]),
+                        domain: Domain::Atoms(vec![&b"nil"[..], &b"test"[..]]),
+                    }
+                }
+            ))
+        );
+
+        assert_eq!(
+            mailbox(r#""Giant; \"Big\" Box" <sysservices@example.net>"#.as_bytes()),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: Some(Phrase(vec![Word::Quoted(QuotedString(vec![
+                        &b"Giant;"[..],
+                        &[ascii::SP],
+                        &[ascii::DQUOTE],
+                        &b"Big"[..],
+                        &[ascii::DQUOTE],
+                        &[ascii::SP],
+                        &b"Box"[..]
+                    ]))])),
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(
+                            &b"sysservices"[..]
+                        ))]),
+                        domain: Domain::Atoms(vec![&b"example"[..], &b"net"[..]]),
+                    }
+                }
+            ))
+        );
+    }
+
+    #[test]
+    fn test_obs_domain_list() {
+        assert_eq!(
+            obs_domain_list(
+                r#"(shhh it's coming)
+ ,
+ (not yet)
+ @33+4.com,,,,
+ ,,,,
+ (again)
+ @example.com,@yep.com,@a,@b,,,@c"#
+                    .as_bytes()
+            ),
+            Ok((
+                &b""[..],
+                vec![
+                    None,
+                    Some(Domain::Atoms(vec![&b"33+4"[..], &b"com"[..]])),
+                    None,
+                    None,
+                    None,
+                    None,
+                    None,
+                    None,
+                    None,
+                    Some(Domain::Atoms(vec![&b"example"[..], &b"com"[..]])),
+                    Some(Domain::Atoms(vec![&b"yep"[..], &b"com"[..]])),
+                    Some(Domain::Atoms(vec![&b"a"[..]])),
+                    Some(Domain::Atoms(vec![&b"b"[..]])),
+                    None,
+                    None,
+                    Some(Domain::Atoms(vec![&b"c"[..]])),
+                ]
+            ))
+        );
+    }
+
+    #[test]
+    fn test_enron1() {
+        assert_eq!(
+            addr_spec("a..howard@enron.com".as_bytes()),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![
+                        LocalPartToken::Word(Word::Atom(&b"a"[..])),
+                        LocalPartToken::Dot,
+                        LocalPartToken::Dot,
+                        LocalPartToken::Word(Word::Atom(&b"howard"[..])),
+                    ]),
+                    domain: Domain::Atoms(vec![&b"enron"[..], &b"com"[..]]),
+                }
+            ))
+        );
+    }
+
+    #[test]
+    fn test_enron2() {
+        assert_eq!(
+            addr_spec(".nelson@enron.com".as_bytes()),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![
+                        LocalPartToken::Dot,
+                        LocalPartToken::Word(Word::Atom(&b"nelson"[..])),
+                    ]),
+                    domain: Domain::Atoms(vec![&b"enron"[..], &b"com"[..]]),
+                }
+            ))
+        );
+    }
+
+    #[test]
+    fn test_enron3() {
+        assert_eq!(
+            addr_spec("ecn2760.conf.@enron.com".as_bytes()),
+            Ok((
+                &b""[..],
+                AddrSpec {
+                    local_part: LocalPart(vec![
+                        LocalPartToken::Word(Word::Atom(&b"ecn2760"[..])),
+                        LocalPartToken::Dot,
+                        LocalPartToken::Word(Word::Atom(&b"conf"[..])),
+                        LocalPartToken::Dot,
+                    ]),
+                    domain: Domain::Atoms(vec![&b"enron"[..], &b"com"[..]]),
+                }
+            ))
+        );
+    }
+
+    #[test]
+    fn test_enron4() {
+        assert_eq!(
+            mailbox(
+                r#"<"mark_kopinski/intl/acim/americancentury"@americancentury.com@enron.com>"#
+                    .as_bytes()
+            ),
+            Ok((
+                &b""[..],
+                MailboxRef {
+                    name: None,
+                    addrspec: AddrSpec {
+                        local_part: LocalPart(vec![LocalPartToken::Word(Word::Quoted(
+                            QuotedString(vec![&b"mark_kopinski/intl/acim/americancentury"[..],])
+                        ))]),
+                        domain: Domain::Atoms(vec![&b"americancentury"[..], &b"com"[..]]),
+                    }
+                }
+            ))
+        );
+    }
+}

src/imf/mime.rs

@@ -0,0 +1,64 @@
+use nom::{
+    bytes::complete::{tag, take},
+    combinator::{map, opt, verify},
+    sequence::tuple,
+    IResult,
+};
+
+use crate::text::ascii;
+use crate::text::whitespace::cfws;
+
+#[derive(Debug, PartialEq)]
+pub struct Version {
+    pub major: u8,
+    pub minor: u8,
+}
+
+pub fn version(input: &[u8]) -> IResult<&[u8], Version> {
+    let (rest, (_, major, _, _, _, minor, _)) = tuple((
+        opt(cfws),
+        map(verify(take(1usize), is_digit), ascii_to_u8),
+        opt(cfws),
+        tag(b"."),
+        opt(cfws),
+        map(verify(take(1usize), is_digit), ascii_to_u8),
+        opt(cfws),
+    ))(input)?;
+    Ok((rest, Version { major, minor }))
+}
+
+fn is_digit(c: &[u8]) -> bool {
+    c[0] >= ascii::N0 && c[0] <= ascii::N9
+}
+
+fn ascii_to_u8(c: &[u8]) -> u8 {
+    c[0] - ascii::N0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_version() {
+        assert_eq!(
+            version(b"1.0"),
+            Ok((&b""[..], Version { major: 1, minor: 0 })),
+        );
+
+        assert_eq!(
+            version(b" 1.0 (produced by MetaSend Vx.x)"),
+            Ok((&b""[..], Version { major: 1, minor: 0 })),
+        );
+
+        assert_eq!(
+            version(b"(produced by MetaSend Vx.x) 1.0"),
+            Ok((&b""[..], Version { major: 1, minor: 0 })),
+        );
+
+        assert_eq!(
+            version(b"1.(produced by MetaSend Vx.x)0"),
+            Ok((&b""[..], Version { major: 1, minor: 0 })),
+        );
+    }
+}

src/imf/mod.rs

@@ -0,0 +1,144 @@
+/// Parse and represent IMF (Internet Message Format) headers (RFC822, RFC5322)
+pub mod address;
+pub mod datetime;
+pub mod field;
+pub mod identification;
+pub mod mailbox;
+pub mod mime;
+pub mod trace;
+
+use nom::{combinator::map, IResult};
+
+use crate::header;
+use crate::imf::address::AddressRef;
+use crate::imf::field::Field;
+use crate::imf::identification::MessageID;
+use crate::imf::mailbox::{AddrSpec, MailboxRef};
+use crate::imf::mime::Version;
+use crate::imf::trace::ReceivedLog;
+use crate::text::misc_token::{PhraseList, Unstructured};
+use chrono::{DateTime, FixedOffset};
+
+#[derive(Debug, PartialEq, Default)]
+pub struct Imf<'a> {
+    // 3.6.1.  The Origination Date Field
+    pub date: Option<DateTime<FixedOffset>>,
+
+    // 3.6.2.  Originator Fields
+    pub from: Vec<MailboxRef<'a>>,
+    pub sender: Option<MailboxRef<'a>>,
+    pub reply_to: Vec<AddressRef<'a>>,
+
+    // 3.6.3.  Destination Address Fields
+    pub to: Vec<AddressRef<'a>>,
+    pub cc: Vec<AddressRef<'a>>,
+    pub bcc: Vec<AddressRef<'a>>,
+
+    // 3.6.4.  Identification Fields
+    pub msg_id: Option<MessageID<'a>>,
+    pub in_reply_to: Vec<MessageID<'a>>,
+    pub references: Vec<MessageID<'a>>,
+
+    // 3.6.5.  Informational Fields
+    pub subject: Option<Unstructured<'a>>,
+    pub comments: Vec<Unstructured<'a>>,
+    pub keywords: Vec<PhraseList<'a>>,
+
+    // 3.6.6 Not implemented
+    // 3.6.7 Trace Fields
+    pub return_path: Vec<AddrSpec<'a>>,
+    pub received: Vec<ReceivedLog<'a>>,
+
+    // MIME
+    pub mime_version: Option<Version>,
+}
+
+//@FIXME min and max limits are not enforced,
+// it may result in missing data or silently overriden data.
+impl<'a> FromIterator<Field<'a>> for Imf<'a> {
+    fn from_iter<I: IntoIterator<Item = Field<'a>>>(iter: I) -> Self {
+        iter.into_iter().fold(Imf::default(), |mut section, field| {
+            match field {
+                Field::Date(v) => section.date = v,
+                Field::From(v) => section.from.extend(v),
+                Field::Sender(v) => section.sender = Some(v),
+                Field::ReplyTo(v) => section.reply_to.extend(v),
+                Field::To(v) => section.to.extend(v),
+                Field::Cc(v) => section.cc.extend(v),
+                Field::Bcc(v) => section.bcc.extend(v),
+                Field::MessageID(v) => section.msg_id = Some(v),
+                Field::InReplyTo(v) => section.in_reply_to.extend(v),
+                Field::References(v) => section.references.extend(v),
+                Field::Subject(v) => section.subject = Some(v),
+                Field::Comments(v) => section.comments.push(v),
+                Field::Keywords(v) => section.keywords.push(v),
+                Field::ReturnPath(v) => v.map(|x| section.return_path.push(x)).unwrap_or(()),
+                Field::Received(v) => section.received.push(v),
+                Field::MIMEVersion(v) => section.mime_version = Some(v),
+            };
+            section
+        })
+    }
+}
+
+pub fn imf(input: &[u8]) -> IResult<&[u8], Imf> {
+    map(header::header_kv, |fields| {
+        fields
+            .iter()
+            .flat_map(Field::try_from)
+            .into_iter()
+            .collect::<Imf>()
+    })(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::imf::address::*;
+    use crate::imf::mailbox::*;
+    use crate::text::misc_token::*;
+    use chrono::{FixedOffset, TimeZone};
+
+    #[test]
+    fn test_header() {
+        let fullmail = b"Date: 7 Mar 2023 08:00:00 +0200
+From: someone@example.com
+To: someone_else@example.com
+Subject: An RFC 822 formatted message
+
+This is the plain text body of the message. Note the blank line
+between the header information and the body of the message.";
+
+        assert_eq!(
+            imf(fullmail),
+            Ok((
+                &b"This is the plain text body of the message. Note the blank line\nbetween the header information and the body of the message."[..],
+                Imf {
+                    date: Some(FixedOffset::east_opt(2 * 3600).unwrap().with_ymd_and_hms(2023, 3, 7, 8, 0, 0).unwrap()),
+                    from: vec![MailboxRef {
+                        name: None,
+                        addrspec: AddrSpec {
+                            local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"someone"[..]))]),
+                            domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                        }
+                    }],
+                    to: vec![AddressRef::Single(MailboxRef {
+                        name: None,
+                        addrspec: AddrSpec {
+                            local_part: LocalPart(vec![LocalPartToken::Word(Word::Atom(&b"someone_else"[..]))]),
+                            domain: Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                        }
+                    })],
+                    subject: Some(Unstructured(vec![
+                        UnstrToken::Plain(&b"An"[..]),
+                        UnstrToken::Plain(&b"RFC"[..]),
+                        UnstrToken::Plain(&b"822"[..]), 
+                        UnstrToken::Plain(&b"formatted"[..]), 
+                        UnstrToken::Plain(&b"message"[..]),
+                    ])),
+                    ..Imf::default()
+                }
+            )),
+        )
+    }
+}

src/imf/trace.rs

@@ -0,0 +1,126 @@
+use chrono::{DateTime, FixedOffset};
+use nom::{
+    branch::alt,
+    bytes::complete::{is_a, tag},
+    combinator::{map, not, opt},
+    multi::many0,
+    sequence::{terminated, tuple},
+    IResult,
+};
+
+use crate::imf::{datetime, mailbox};
+use crate::text::{ascii, misc_token, whitespace};
+
+#[derive(Debug, PartialEq)]
+pub enum ReceivedLogToken<'a> {
+    Addr(mailbox::AddrSpec<'a>),
+    Domain(mailbox::Domain<'a>),
+    Word(misc_token::Word<'a>),
+}
+
+#[derive(Debug, PartialEq)]
+pub struct ReceivedLog<'a> {
+    pub log: Vec<ReceivedLogToken<'a>>,
+    pub date: Option<DateTime<FixedOffset>>,
+}
+
+/*
+impl<'a> TryFrom<&'a lazy::ReceivedLog<'a>> for ReceivedLog<'a> {
+    type Error = IMFError<'a>;
+
+    fn try_from(input: &'a lazy::ReceivedLog<'a>) -> Result<Self, Self::Error> {
+        received_body(input.0)
+            .map_err(|e| IMFError::ReceivedLog(e))
+            .map(|(_, v)| ReceivedLog(v))
+    }
+}*/
+
+pub fn received_log(input: &[u8]) -> IResult<&[u8], ReceivedLog> {
+    map(
+        tuple((many0(received_tokens), tag(";"), datetime::section)),
+        |(tokens, _, dt)| ReceivedLog {
+            log: tokens,
+            date: dt,
+        },
+    )(input)
+}
+
+pub fn return_path(input: &[u8]) -> IResult<&[u8], Option<mailbox::AddrSpec>> {
+    alt((map(mailbox::angle_addr, Some), empty_path))(input)
+}
+
+fn empty_path(input: &[u8]) -> IResult<&[u8], Option<mailbox::AddrSpec>> {
+    let (input, _) = tuple((
+        opt(whitespace::cfws),
+        tag(&[ascii::LT]),
+        opt(whitespace::cfws),
+        tag(&[ascii::GT]),
+        opt(whitespace::cfws),
+    ))(input)?;
+    Ok((input, None))
+}
+
+fn received_tokens(input: &[u8]) -> IResult<&[u8], ReceivedLogToken> {
+    alt((
+        terminated(
+            map(misc_token::word, ReceivedLogToken::Word),
+            not(is_a([ascii::PERIOD, ascii::AT])),
+        ),
+        map(mailbox::angle_addr, ReceivedLogToken::Addr),
+        map(mailbox::addr_spec, ReceivedLogToken::Addr),
+        map(mailbox::obs_domain, ReceivedLogToken::Domain),
+    ))(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::imf::trace::misc_token::Word;
+    use chrono::TimeZone;
+
+    #[test]
+    fn test_received_body() {
+        let hdrs = r#"from smtp.example.com ([10.83.2.2])
+    by server with LMTP
+    id xxxxxxxxx
+    (envelope-from <gitlab@example.com>)
+    for <me@example.com>; Tue, 13 Jun 2023 19:01:08 +0000"#
+            .as_bytes();
+
+        assert_eq!(
+            received_log(hdrs),
+            Ok((
+                &b""[..],
+                ReceivedLog {
+                    date: Some(
+                        FixedOffset::east_opt(0)
+                            .unwrap()
+                            .with_ymd_and_hms(2023, 06, 13, 19, 1, 8)
+                            .unwrap()
+                    ),
+                    log: vec![
+                        ReceivedLogToken::Word(Word::Atom(&b"from"[..])),
+                        ReceivedLogToken::Domain(mailbox::Domain::Atoms(vec![
+                            &b"smtp"[..],
+                            &b"example"[..],
+                            &b"com"[..]
+                        ])),
+                        ReceivedLogToken::Word(Word::Atom(&b"by"[..])),
+                        ReceivedLogToken::Word(Word::Atom(&b"server"[..])),
+                        ReceivedLogToken::Word(Word::Atom(&b"with"[..])),
+                        ReceivedLogToken::Word(Word::Atom(&b"LMTP"[..])),
+                        ReceivedLogToken::Word(Word::Atom(&b"id"[..])),
+                        ReceivedLogToken::Word(Word::Atom(&b"xxxxxxxxx"[..])),
+                        ReceivedLogToken::Word(Word::Atom(&b"for"[..])),
+                        ReceivedLogToken::Addr(mailbox::AddrSpec {
+                            local_part: mailbox::LocalPart(vec![mailbox::LocalPartToken::Word(
+                                Word::Atom(&b"me"[..])
+                            )]),
+                            domain: mailbox::Domain::Atoms(vec![&b"example"[..], &b"com"[..]]),
+                        })
+                    ],
+                }
+            ))
+        );
+    }
+}

src/lib.rs

@@ -1,3 +1,104 @@
-pub mod error;
+#![doc = include_str!("../README.md")]
-pub mod fragments;
+
-pub mod multipass;
+/// Parse and represent full emails as "parts" as defined by MIME (RFC 2046)
+pub mod part;
+
+/// Parse and represent IMF (Internet Message Format) headers (RFC 822, RFC 5322)
+pub mod imf;
+
+/// Parse and represent MIME headers (RFC 2045, RFC 2047)
+pub mod mime;
+
+/// MIME and IMF represent headers the same way: module contains their commong logic
+pub mod header;
+
+/// Low-level email-specific text-based representation for data
+pub mod text;
+
+/// Manipulate buffer of bytes
+mod pointers;
+
+use nom::{combinator::into, IResult};
+
+/// Parse a whole email including its (MIME) body
+///
+/// Returns the parsed content, but also the remaining bytes
+/// if the parser stopped before arriving to the end (for example
+/// due to a multipart delimiter).
+///
+/// # Arguments
+///
+/// * `input` - A buffer of bytes containing your full email
+///
+/// # Returns
+///
+/// * `rest` - The rest of the buffer, the part that is not parsed as the email ended before the
+/// end of the data
+/// * `msg` - The parsed message
+///
+/// # Examples
+///
+/// ```
+/// let input = br#"Date: 7 Mar 2023 08:00:00 +0200
+/// From: deuxfleurs@example.com
+/// To: someone_else@example.com
+/// Subject: An RFC 822 formatted message
+/// MIME-Version: 1.0
+/// Content-Type: text/plain; charset=us-ascii
+///
+/// This is the plain text body of the message. Note the blank line
+/// between the header information and the body of the message."#;
+///
+/// let (_, email) = eml_codec::parse_message(input).unwrap();
+/// println!(
+///     "{} raw message is:\n{}",
+///     email.imf.from[0].to_string(),
+///     String::from_utf8_lossy(email.child.as_text().unwrap().body),
+/// );
+/// ```
+pub fn parse_message(input: &[u8]) -> IResult<&[u8], part::composite::Message> {
+    into(part::composite::message(mime::MIME::<
+        mime::r#type::DeductibleMessage,
+    >::default()))(input)
+}
+
+/// Only extract the headers of the email that are part of the Internet Message Format spec
+///
+/// Emails headers contain MIME and IMF (Internet Message Format) headers.
+/// Sometimes you only need to know the recipient or the sender of an email,
+/// and are not interested in its content. In this case, you only need to parse the IMF
+/// fields and can ignore the MIME headers + the body. This is what this function does.
+///
+/// # Arguments
+///
+/// * `input` - A buffer of bytes containing either only the headers of your email or your full
+/// email (in both cases, the body will be ignored)
+///
+/// # Returns
+///
+/// * `rest` - The rest of the buffer, ie. the body of your email as raw bytes
+/// * `imf` - The parsed IMF headers of your email
+///
+/// # Examples
+///
+/// ```
+/// let input = br#"Date: 7 Mar 2023 08:00:00 +0200
+/// From: deuxfleurs@example.com
+/// To: someone_else@example.com
+/// Subject: An RFC 822 formatted message
+/// MIME-Version: 1.0
+/// Content-Type: text/plain; charset=us-ascii
+///
+/// This is the plain text body of the message. Note the blank line
+/// between the header information and the body of the message."#;
+///
+/// let (_, imf) = eml_codec::parse_imf(input).unwrap();
+/// println!(
+///     "{} just sent you an email with subject \"{}\"",
+///     imf.from[0].to_string(),
+///     imf.subject.unwrap().to_string(),
+/// );
+/// ```
+pub fn parse_imf(input: &[u8]) -> IResult<&[u8], imf::Imf> {
+    imf::imf(input)
+}

src/mime/charset.rs

@@ -0,0 +1,151 @@
+use encoding_rs::Encoding;
+
+/// Specific implementation of charset
+///
+/// imf_codec has its own charset list to follow IANA's one.
+/// encoding_rs implements a different standard that does not know US_ASCII.
+/// using encoding_rs datastructures directly would lead to a loss of information.
+/// https://www.iana.org/assignments/character-sets/character-sets.xhtml
+#[allow(non_camel_case_types)]
+#[derive(Debug, PartialEq, Default, Clone)]
+pub enum EmailCharset {
+    #[default]
+    US_ASCII,
+    ISO_8859_1,
+    ISO_8859_2,
+    ISO_8859_3,
+    ISO_8859_4,
+    ISO_8859_5,
+    ISO_8859_6,
+    ISO_8859_7,
+    ISO_8859_8,
+    ISO_8859_9,
+    ISO_8859_10,
+    Shift_JIS,
+    EUC_JP,
+    ISO_2022_KR,
+    EUC_KR,
+    ISO_2022_JP,
+    ISO_2022_JP_2,
+    ISO_8859_6_E,
+    ISO_8859_6_I,
+    ISO_8859_8_E,
+    ISO_8859_8_I,
+    GB2312,
+    Big5,
+    KOI8_R,
+    UTF_8,
+    Unknown,
+}
+
+impl<'a> From<&'a str> for EmailCharset {
+    fn from(s: &'a str) -> Self {
+        Self::from(s.as_bytes())
+    }
+}
+
+impl<'a> From<&'a [u8]> for EmailCharset {
+    fn from(s: &'a [u8]) -> Self {
+        match s.to_ascii_lowercase().as_slice() {
+            b"us-ascii" | b"ascii" => EmailCharset::US_ASCII,
+            b"iso-8859-1" => EmailCharset::ISO_8859_1,
+            b"iso-8859-2" => EmailCharset::ISO_8859_2,
+            b"iso-8859-3" => EmailCharset::ISO_8859_3,
+            b"iso-8859-4" => EmailCharset::ISO_8859_4,
+            b"iso-8859-5" => EmailCharset::ISO_8859_5,
+            b"iso-8859-6" => EmailCharset::ISO_8859_6,
+            b"iso-8859-7" => EmailCharset::ISO_8859_7,
+            b"iso-8859-8" => EmailCharset::ISO_8859_8,
+            b"iso-8859-9" => EmailCharset::ISO_8859_9,
+            b"iso-8859-10" => EmailCharset::ISO_8859_10,
+            b"shift_jis" => EmailCharset::Shift_JIS,
+            b"euc-jp" => EmailCharset::EUC_JP,
+            b"iso-2022-kr" => EmailCharset::ISO_2022_KR,
+            b"euc-kr" => EmailCharset::EUC_KR,
+            b"iso-2022-jp" => EmailCharset::ISO_2022_JP,
+            b"iso-2022-jp-2" => EmailCharset::ISO_2022_JP_2,
+            b"iso-8859-6-e" => EmailCharset::ISO_8859_6_E,
+            b"iso-8859-6-i" => EmailCharset::ISO_8859_6_I,
+            b"iso-8859-8-e" => EmailCharset::ISO_8859_8_E,
+            b"iso-8859-8-i" => EmailCharset::ISO_8859_8_I,
+            b"gb2312" => EmailCharset::GB2312,
+            b"big5" => EmailCharset::Big5,
+            b"koi8-r" => EmailCharset::KOI8_R,
+            b"utf-8" | b"utf8" => EmailCharset::UTF_8,
+            _ => EmailCharset::Unknown,
+        }
+    }
+}
+
+impl ToString for EmailCharset {
+    fn to_string(&self) -> String {
+        self.as_str().into()
+    }
+}
+
+impl EmailCharset {
+    pub fn as_str(&self) -> &'static str {
+        use EmailCharset::*;
+        match self {
+            US_ASCII => "US-ASCII",
+            ISO_8859_1 => "ISO-8859-1",
+            ISO_8859_2 => "ISO-8859-2",
+            ISO_8859_3 => "ISO-8859-3",
+            ISO_8859_4 => "ISO-8859-4",
+            ISO_8859_5 => "ISO-8859-5",
+            ISO_8859_6 => "ISO-8859-6",
+            ISO_8859_7 => "ISO-8859-7",
+            ISO_8859_8 => "ISO-8859-8",
+            ISO_8859_9 => "ISO-8859-9",
+            ISO_8859_10 => "ISO-8859-10",
+            Shift_JIS => "Shift_JIS",
+            EUC_JP => "EUC-JP",
+            ISO_2022_KR => "ISO-2022-KR",
+            EUC_KR => "EUC-KR",
+            ISO_2022_JP => "ISO-2022-JP",
+            ISO_2022_JP_2 => "ISO-2022-JP-2",
+            ISO_8859_6_E => "ISO-8859-6-E",
+            ISO_8859_6_I => "ISO-8859-6-I",
+            ISO_8859_8_E => "ISO-8859-8-E",
+            ISO_8859_8_I => "ISO-8859-8-I",
+            GB2312 => "GB2312",
+            Big5 => "Big5",
+            KOI8_R => "KOI8-R",
+            UTF_8 => "UTF-8",
+            Unknown => "UTF-8",
+        }
+    }
+
+    pub fn as_encoding(&self) -> &'static Encoding {
+        Encoding::for_label(self.as_str().as_bytes()).unwrap_or(encoding_rs::WINDOWS_1252)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_charset() {
+        assert_eq!(EmailCharset::from(&b"Us-Ascii"[..]).as_str(), "US-ASCII",);
+
+        assert_eq!(
+            EmailCharset::from(&b"Us-Ascii"[..]).as_encoding(),
+            encoding_rs::WINDOWS_1252,
+        );
+
+        assert_eq!(
+            EmailCharset::from(&b"ISO-8859-1"[..]).as_encoding(),
+            encoding_rs::WINDOWS_1252,
+        );
+
+        assert_eq!(
+            EmailCharset::from(&b"utf-8"[..]).as_encoding(),
+            encoding_rs::UTF_8,
+        );
+
+        assert_eq!(
+            EmailCharset::from(&b"utf8"[..]).as_encoding(),
+            encoding_rs::UTF_8,
+        );
+    }
+}

src/mime/field.rs

@@ -0,0 +1,135 @@
+use nom::combinator::map;
+
+use crate::header;
+use crate::imf::identification::{msg_id, MessageID};
+use crate::mime::mechanism::{mechanism, Mechanism};
+use crate::mime::r#type::{naive_type, NaiveType};
+use crate::text::misc_token::{unstructured, Unstructured};
+
+#[derive(Debug, PartialEq)]
+pub enum Content<'a> {
+    Type(NaiveType<'a>),
+    TransferEncoding(Mechanism<'a>),
+    ID(MessageID<'a>),
+    Description(Unstructured<'a>),
+}
+#[allow(dead_code)]
+impl<'a> Content<'a> {
+    pub fn ctype(&'a self) -> Option<&'a NaiveType<'a>> {
+        match self {
+            Content::Type(v) => Some(v),
+            _ => None,
+        }
+    }
+    pub fn transfer_encoding(&'a self) -> Option<&'a Mechanism<'a>> {
+        match self {
+            Content::TransferEncoding(v) => Some(v),
+            _ => None,
+        }
+    }
+    pub fn id(&'a self) -> Option<&'a MessageID<'a>> {
+        match self {
+            Content::ID(v) => Some(v),
+            _ => None,
+        }
+    }
+    pub fn description(&'a self) -> Option<&'a Unstructured<'a>> {
+        match self {
+            Content::Description(v) => Some(v),
+            _ => None,
+        }
+    }
+}
+
+impl<'a> TryFrom<&header::Field<'a>> for Content<'a> {
+    type Error = ();
+    fn try_from(f: &header::Field<'a>) -> Result<Self, Self::Error> {
+        let content = match f {
+            header::Field::Good(header::Kv2(key, value)) => match key
+                .to_ascii_lowercase()
+                .as_slice()
+            {
+                b"content-type" => map(naive_type, Content::Type)(value),
+                b"content-transfer-encoding" => map(mechanism, Content::TransferEncoding)(value),
+                b"content-id" => map(msg_id, Content::ID)(value),
+                b"content-description" => map(unstructured, Content::Description)(value),
+                _ => return Err(()),
+            },
+            _ => return Err(()),
+        };
+
+        //@TODO check that the full value is parsed, otherwise maybe log an error ?!
+        content.map(|(_, content)| content).or(Err(()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::header;
+    //use crate::mime::charset::EmailCharset;
+    use crate::mime::r#type::*;
+    use crate::text::misc_token::MIMEWord;
+    use crate::text::quoted::QuotedString;
+
+    /*
+    #[test]
+    fn test_content_type() {
+        let (rest, content) =
+            content(b"Content-Type: text/plain; charset=UTF-8; format=flowed\r\n").unwrap();
+        assert_eq!(&b""[..], rest);
+
+        if let Content::Type(nt) = content {
+            assert_eq!(
+                nt.to_type(),
+                AnyType::Text(Deductible::Explicit(Text {
+                    charset: Deductible::Explicit(EmailCharset::UTF_8),
+                    subtype: TextSubtype::Plain,
+                })),
+            );
+        } else {
+            panic!("Expected Content::Type, got {:?}", content);
+        }
+    }*/
+
+    #[test]
+    fn test_header() {
+        let fullmail: &[u8] = r#"Date: Sat, 8 Jul 2023 07:14:29 +0200
+From: Grrrnd Zero <grrrndzero@example.org>
+To: John Doe <jdoe@machine.example>
+Subject: Re: Saying Hello
+Message-ID: <NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5@www.grrrndzero.org>
+MIME-Version: 1.0
+Content-Type: multipart/alternative;
+ boundary="b1_e376dc71bafc953c0b0fdeb9983a9956"
+Content-Transfer-Encoding: 7bit
+
+This is a multipart message.
+
+"#
+        .as_bytes();
+
+        assert_eq!(
+            map(header::header_kv, |k| k
+                .iter()
+                .flat_map(Content::try_from)
+                .collect())(fullmail),
+            Ok((
+                &b"This is a multipart message.\n\n"[..],
+                vec![
+                    Content::Type(NaiveType {
+                        main: &b"multipart"[..],
+                        sub: &b"alternative"[..],
+                        params: vec![Parameter {
+                            name: &b"boundary"[..],
+                            value: MIMEWord::Quoted(QuotedString(vec![
+                                &b"b1_e376dc71bafc953c0b0fdeb9983a9956"[..]
+                            ])),
+                        }]
+                    }),
+                    Content::TransferEncoding(Mechanism::_7Bit),
+                ],
+            )),
+        );
+    }
+}

src/mime/mechanism.rs

@@ -0,0 +1,79 @@
+use crate::text::whitespace::cfws;
+use crate::text::words::mime_atom as token;
+use nom::{
+    branch::alt,
+    bytes::complete::tag_no_case,
+    combinator::{map, opt, value},
+    sequence::delimited,
+    IResult,
+};
+
+#[derive(Debug, Clone, PartialEq, Default)]
+pub enum Mechanism<'a> {
+    #[default]
+    _7Bit,
+    _8Bit,
+    Binary,
+    QuotedPrintable,
+    Base64,
+    Other(&'a [u8]),
+}
+impl<'a> ToString for Mechanism<'a> {
+    fn to_string(&self) -> String {
+        use Mechanism::*;
+        let buf: &[u8] = match self {
+            _7Bit => b"7bit",
+            _8Bit => b"8bit",
+            Binary => b"binary",
+            QuotedPrintable => b"quoted-printable",
+            Base64 => b"base64",
+            Other(x) => x,
+        };
+        String::from_utf8_lossy(buf).to_string()
+    }
+}
+
+pub fn mechanism(input: &[u8]) -> IResult<&[u8], Mechanism> {
+    use Mechanism::*;
+
+    alt((
+        delimited(
+            opt(cfws),
+            alt((
+                value(_7Bit, tag_no_case("7bit")),
+                value(_8Bit, tag_no_case("8bit")),
+                value(Binary, tag_no_case("binary")),
+                value(QuotedPrintable, tag_no_case("quoted-printable")),
+                value(Base64, tag_no_case("base64")),
+            )),
+            opt(cfws),
+        ),
+        map(token, Other),
+    ))(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_mechanism() {
+        assert_eq!(mechanism(b"7bit"), Ok((&b""[..], Mechanism::_7Bit)),);
+
+        assert_eq!(
+            mechanism(b"(youhou) 8bit"),
+            Ok((&b""[..], Mechanism::_8Bit)),
+        );
+
+        assert_eq!(
+            mechanism(b"(blip) bInArY (blip blip)"),
+            Ok((&b""[..], Mechanism::Binary)),
+        );
+
+        assert_eq!(mechanism(b" base64 "), Ok((&b""[..], Mechanism::Base64)),);
+
+        assert_eq!(
+            mechanism(b" Quoted-Printable "),
+            Ok((&b""[..], Mechanism::QuotedPrintable)),
+        );
+    }
+}

src/mime/mod.rs

@@ -0,0 +1,149 @@
+/// Parsed and represent an email character set
+pub mod charset;
+
+/// MIME specific headers
+pub mod field;
+
+/// Transfer-Encoding representation
+pub mod mechanism;
+
+/// Content-Type representation
+pub mod r#type;
+
+use std::fmt;
+use std::marker::PhantomData;
+
+use crate::header;
+use crate::imf::identification::MessageID;
+use crate::mime::field::Content;
+use crate::mime::mechanism::Mechanism;
+use crate::mime::r#type::{AnyType, NaiveType};
+use crate::text::misc_token::Unstructured; //Multipart, Message, Text, Binary};
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct MIME<'a, T> {
+    pub interpreted_type: T,
+    pub fields: NaiveMIME<'a>,
+}
+impl<'a> Default for MIME<'a, r#type::DeductibleText> {
+    fn default() -> Self {
+        Self {
+            interpreted_type: r#type::DeductibleText::default(),
+            fields: NaiveMIME::default(),
+        }
+    }
+}
+impl<'a> Default for MIME<'a, r#type::DeductibleMessage> {
+    fn default() -> Self {
+        Self {
+            interpreted_type: r#type::DeductibleMessage::default(),
+            fields: NaiveMIME::default(),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum AnyMIME<'a> {
+    Mult(MIME<'a, r#type::Multipart>),
+    Msg(MIME<'a, r#type::DeductibleMessage>),
+    Txt(MIME<'a, r#type::DeductibleText>),
+    Bin(MIME<'a, r#type::Binary>),
+}
+impl<'a> AnyMIME<'a> {
+    pub fn fields(&self) -> &NaiveMIME<'a> {
+        match self {
+            Self::Mult(v) => &v.fields,
+            Self::Msg(v) => &v.fields,
+            Self::Txt(v) => &v.fields,
+            Self::Bin(v) => &v.fields,
+        }
+    }
+}
+
+impl<'a, T: WithDefaultType> From<AnyMIMEWithDefault<'a, T>> for AnyMIME<'a> {
+    fn from(a: AnyMIMEWithDefault<'a, T>) -> Self {
+        a.0
+    }
+}
+
+#[derive(PartialEq, Default, Clone)]
+pub struct NaiveMIME<'a> {
+    pub ctype: Option<NaiveType<'a>>,
+    pub transfer_encoding: Mechanism<'a>,
+    pub id: Option<MessageID<'a>>,
+    pub description: Option<Unstructured<'a>>,
+    pub kv: Vec<header::Field<'a>>,
+    pub raw: &'a [u8],
+}
+impl<'a> fmt::Debug for NaiveMIME<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("NaiveMime")
+            .field("ctype", &self.ctype)
+            .field("transfer_encoding", &self.transfer_encoding)
+            .field("id", &self.id)
+            .field("description", &self.description)
+            .field("kv", &self.kv)
+            .field("raw", &String::from_utf8_lossy(self.raw))
+            .finish()
+    }
+}
+
+impl<'a> FromIterator<Content<'a>> for NaiveMIME<'a> {
+    fn from_iter<I: IntoIterator<Item = Content<'a>>>(it: I) -> Self {
+        it.into_iter()
+            .fold(NaiveMIME::default(), |mut section, field| {
+                match field {
+                    Content::Type(v) => section.ctype = Some(v),
+                    Content::TransferEncoding(v) => section.transfer_encoding = v,
+                    Content::ID(v) => section.id = Some(v),
+                    Content::Description(v) => section.description = Some(v),
+                };
+                section
+            })
+    }
+}
+
+impl<'a> NaiveMIME<'a> {
+    pub fn with_kv(mut self, fields: Vec<header::Field<'a>>) -> Self {
+        self.kv = fields;
+        self
+    }
+    pub fn with_raw(mut self, raw: &'a [u8]) -> Self {
+        self.raw = raw;
+        self
+    }
+    pub fn to_interpreted<T: WithDefaultType>(self) -> AnyMIME<'a> {
+        self.ctype
+            .as_ref()
+            .map(|c| c.to_type())
+            .unwrap_or(T::default_type())
+            .to_mime(self)
+            .into()
+    }
+}
+
+pub trait WithDefaultType {
+    fn default_type() -> AnyType;
+}
+
+pub struct WithGenericDefault {}
+impl WithDefaultType for WithGenericDefault {
+    fn default_type() -> AnyType {
+        AnyType::Text(r#type::DeductibleText::default())
+    }
+}
+pub struct WithDigestDefault {}
+impl WithDefaultType for WithDigestDefault {
+    fn default_type() -> AnyType {
+        AnyType::Message(r#type::DeductibleMessage::default())
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub struct AnyMIMEWithDefault<'a, T: WithDefaultType>(pub AnyMIME<'a>, PhantomData<T>);
+
+impl<'a, T: WithDefaultType> Default for AnyMIMEWithDefault<'a, T> {
+    fn default() -> Self {
+        Self(T::default_type().to_mime(NaiveMIME::default()), PhantomData)
+    }
+}

src/mime/type.rs

@@ -0,0 +1,394 @@
+use nom::{
+    bytes::complete::tag,
+    combinator::{map, opt},
+    multi::many0,
+    sequence::{preceded, terminated, tuple},
+    IResult,
+};
+use std::fmt;
+
+use crate::mime::charset::EmailCharset;
+use crate::mime::{AnyMIME, NaiveMIME, MIME};
+use crate::text::misc_token::{mime_word, MIMEWord};
+use crate::text::words::mime_atom;
+
+// --------- NAIVE TYPE
+#[derive(PartialEq, Clone)]
+pub struct NaiveType<'a> {
+    pub main: &'a [u8],
+    pub sub: &'a [u8],
+    pub params: Vec<Parameter<'a>>,
+}
+impl<'a> fmt::Debug for NaiveType<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("mime::NaiveType")
+            .field("main", &String::from_utf8_lossy(self.main))
+            .field("sub", &String::from_utf8_lossy(self.sub))
+            .field("params", &self.params)
+            .finish()
+    }
+}
+impl<'a> NaiveType<'a> {
+    pub fn to_type(&self) -> AnyType {
+        self.into()
+    }
+}
+pub fn naive_type(input: &[u8]) -> IResult<&[u8], NaiveType> {
+    map(
+        tuple((mime_atom, tag("/"), mime_atom, parameter_list)),
+        |(main, _, sub, params)| NaiveType { main, sub, params },
+    )(input)
+}
+
+#[derive(PartialEq, Clone)]
+pub struct Parameter<'a> {
+    pub name: &'a [u8],
+    pub value: MIMEWord<'a>,
+}
+impl<'a> fmt::Debug for Parameter<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("mime::Parameter")
+            .field("name", &String::from_utf8_lossy(self.name))
+            .field("value", &self.value)
+            .finish()
+    }
+}
+
+pub fn parameter(input: &[u8]) -> IResult<&[u8], Parameter> {
+    map(
+        tuple((mime_atom, tag(b"="), mime_word)),
+        |(name, _, value)| Parameter { name, value },
+    )(input)
+}
+pub fn parameter_list(input: &[u8]) -> IResult<&[u8], Vec<Parameter>> {
+    terminated(many0(preceded(tag(";"), parameter)), opt(tag(";")))(input)
+}
+
+// MIME TYPES TRANSLATED TO RUST TYPING SYSTEM
+
+#[derive(Debug, PartialEq)]
+pub enum AnyType {
+    // Composite types
+    Multipart(Multipart),
+    Message(Deductible<Message>),
+
+    // Discrete types
+    Text(Deductible<Text>),
+    Binary(Binary),
+}
+
+impl<'a> From<&'a NaiveType<'a>> for AnyType {
+    fn from(nt: &'a NaiveType<'a>) -> Self {
+        match nt.main.to_ascii_lowercase().as_slice() {
+            b"multipart" => Multipart::try_from(nt)
+                .map(Self::Multipart)
+                .unwrap_or(Self::Text(DeductibleText::default())),
+            b"message" => Self::Message(DeductibleMessage::Explicit(Message::from(nt))),
+            b"text" => Self::Text(DeductibleText::Explicit(Text::from(nt))),
+            _ => Self::Binary(Binary::default()),
+        }
+    }
+}
+
+impl<'a> AnyType {
+    pub fn to_mime(self, fields: NaiveMIME<'a>) -> AnyMIME<'a> {
+        match self {
+            Self::Multipart(interpreted_type) => AnyMIME::Mult(MIME::<Multipart> {
+                interpreted_type,
+                fields,
+            }),
+            Self::Message(interpreted_type) => AnyMIME::Msg(MIME::<DeductibleMessage> {
+                interpreted_type,
+                fields,
+            }),
+            Self::Text(interpreted_type) => AnyMIME::Txt(MIME::<DeductibleText> {
+                interpreted_type,
+                fields,
+            }),
+            Self::Binary(interpreted_type) => AnyMIME::Bin(MIME::<Binary> {
+                interpreted_type,
+                fields,
+            }),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Deductible<T: Default> {
+    Inferred(T),
+    Explicit(T),
+}
+impl<T: Default> Default for Deductible<T> {
+    fn default() -> Self {
+        Self::Inferred(T::default())
+    }
+}
+
+// REAL PARTS
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct Multipart {
+    pub subtype: MultipartSubtype,
+    pub boundary: String,
+}
+impl Multipart {
+    pub fn main_type(&self) -> String {
+        "multipart".into()
+    }
+}
+impl<'a> TryFrom<&'a NaiveType<'a>> for Multipart {
+    type Error = ();
+
+    fn try_from(nt: &'a NaiveType<'a>) -> Result<Self, Self::Error> {
+        nt.params
+            .iter()
+            .find(|x| x.name.to_ascii_lowercase().as_slice() == b"boundary")
+            .map(|boundary| Multipart {
+                subtype: MultipartSubtype::from(nt),
+                boundary: boundary.value.to_string(),
+            })
+            .ok_or(())
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum MultipartSubtype {
+    Alternative,
+    Mixed,
+    Digest,
+    Parallel,
+    Report,
+    Unknown,
+}
+impl ToString for MultipartSubtype {
+    fn to_string(&self) -> String {
+        match self {
+            Self::Alternative => "alternative",
+            Self::Mixed => "mixed",
+            Self::Digest => "digest",
+            Self::Parallel => "parallel",
+            Self::Report => "report",
+            Self::Unknown => "mixed",
+        }
+        .into()
+    }
+}
+impl<'a> From<&NaiveType<'a>> for MultipartSubtype {
+    fn from(nt: &NaiveType<'a>) -> Self {
+        match nt.sub.to_ascii_lowercase().as_slice() {
+            b"alternative" => Self::Alternative,
+            b"mixed" => Self::Mixed,
+            b"digest" => Self::Digest,
+            b"parallel" => Self::Parallel,
+            b"report" => Self::Report,
+            _ => Self::Unknown,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Default, Clone)]
+pub enum MessageSubtype {
+    #[default]
+    RFC822,
+    Partial,
+    External,
+    Unknown,
+}
+impl ToString for MessageSubtype {
+    fn to_string(&self) -> String {
+        match self {
+            Self::RFC822 => "rfc822",
+            Self::Partial => "partial",
+            Self::External => "external",
+            Self::Unknown => "rfc822",
+        }
+        .into()
+    }
+}
+
+pub type DeductibleMessage = Deductible<Message>;
+#[derive(Debug, PartialEq, Default, Clone)]
+pub struct Message {
+    pub subtype: MessageSubtype,
+}
+impl<'a> From<&NaiveType<'a>> for Message {
+    fn from(nt: &NaiveType<'a>) -> Self {
+        match nt.sub.to_ascii_lowercase().as_slice() {
+            b"rfc822" => Self {
+                subtype: MessageSubtype::RFC822,
+            },
+            b"partial" => Self {
+                subtype: MessageSubtype::Partial,
+            },
+            b"external" => Self {
+                subtype: MessageSubtype::External,
+            },
+            _ => Self {
+                subtype: MessageSubtype::Unknown,
+            },
+        }
+    }
+}
+impl From<Deductible<Message>> for Message {
+    fn from(d: Deductible<Message>) -> Self {
+        match d {
+            Deductible::Inferred(t) | Deductible::Explicit(t) => t,
+        }
+    }
+}
+
+pub type DeductibleText = Deductible<Text>;
+#[derive(Debug, PartialEq, Default, Clone)]
+pub struct Text {
+    pub subtype: TextSubtype,
+    pub charset: Deductible<EmailCharset>,
+}
+impl<'a> From<&NaiveType<'a>> for Text {
+    fn from(nt: &NaiveType<'a>) -> Self {
+        Self {
+            subtype: TextSubtype::from(nt),
+            charset: nt
+                .params
+                .iter()
+                .find(|x| x.name.to_ascii_lowercase().as_slice() == b"charset")
+                .map(|x| Deductible::Explicit(EmailCharset::from(x.value.to_string().as_bytes())))
+                .unwrap_or(Deductible::Inferred(EmailCharset::US_ASCII)),
+        }
+    }
+}
+impl From<Deductible<Text>> for Text {
+    fn from(d: Deductible<Text>) -> Self {
+        match d {
+            Deductible::Inferred(t) | Deductible::Explicit(t) => t,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Default, Clone)]
+pub enum TextSubtype {
+    #[default]
+    Plain,
+    Html,
+    Unknown,
+}
+impl ToString for TextSubtype {
+    fn to_string(&self) -> String {
+        match self {
+            Self::Plain | Self::Unknown => "plain",
+            Self::Html => "html",
+        }
+        .into()
+    }
+}
+impl<'a> From<&NaiveType<'a>> for TextSubtype {
+    fn from(nt: &NaiveType<'a>) -> Self {
+        match nt.sub.to_ascii_lowercase().as_slice() {
+            b"plain" => Self::Plain,
+            b"html" => Self::Html,
+            _ => Self::Unknown,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Default, Clone)]
+pub struct Binary {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::mime::charset::EmailCharset;
+    use crate::mime::r#type::Deductible;
+    use crate::text::quoted::QuotedString;
+
+    #[test]
+    fn test_parameter() {
+        assert_eq!(
+            parameter(b"charset=utf-8"),
+            Ok((
+                &b""[..],
+                Parameter {
+                    name: &b"charset"[..],
+                    value: MIMEWord::Atom(&b"utf-8"[..]),
+                }
+            )),
+        );
+        assert_eq!(
+            parameter(b"charset=\"utf-8\""),
+            Ok((
+                &b""[..],
+                Parameter {
+                    name: &b"charset"[..],
+                    value: MIMEWord::Quoted(QuotedString(vec![&b"utf-8"[..]])),
+                }
+            )),
+        );
+    }
+
+    #[test]
+    fn test_content_type_plaintext() {
+        let (rest, nt) = naive_type(b"text/plain;\r\n charset=utf-8").unwrap();
+        assert_eq!(rest, &b""[..]);
+
+        assert_eq!(
+            nt.to_type(),
+            AnyType::Text(Deductible::Explicit(Text {
+                charset: Deductible::Explicit(EmailCharset::UTF_8),
+                subtype: TextSubtype::Plain,
+            }))
+        );
+    }
+
+    #[test]
+    fn test_content_type_multipart() {
+        let (rest, nt) = naive_type(b"multipart/mixed;\r\n\tboundary=\"--==_mimepart_64a3f2c69114f_2a13d020975fe\";\r\n\tcharset=UTF-8").unwrap();
+        assert_eq!(rest, &[]);
+        assert_eq!(
+            nt.to_type(),
+            AnyType::Multipart(Multipart {
+                subtype: MultipartSubtype::Mixed,
+                boundary: "--==_mimepart_64a3f2c69114f_2a13d020975fe".into(),
+            })
+        );
+    }
+
+    #[test]
+    fn test_content_type_message() {
+        let (rest, nt) = naive_type(b"message/rfc822").unwrap();
+        assert_eq!(rest, &[]);
+
+        assert_eq!(
+            nt.to_type(),
+            AnyType::Message(Deductible::Explicit(Message {
+                subtype: MessageSubtype::RFC822
+            }))
+        );
+    }
+
+    #[test]
+    fn test_parameter_ascii() {
+        assert_eq!(
+            parameter(b"charset = (simple) us-ascii (Plain text)"),
+            Ok((
+                &b""[..],
+                Parameter {
+                    name: &b"charset"[..],
+                    value: MIMEWord::Atom(&b"us-ascii"[..]),
+                }
+            ))
+        );
+    }
+
+    #[test]
+    fn test_parameter_terminated_with_semi_colon() {
+        assert_eq!(
+            parameter_list(b";boundary=\"festivus\";"),
+            Ok((
+                &b""[..],
+                vec![Parameter {
+                    name: &b"boundary"[..],
+                    value: MIMEWord::Quoted(QuotedString(vec![&b"festivus"[..]])),
+                }],
+            ))
+        );
+    }
+}

src/multipass/extract_fields.rs

@@ -1,66 +0,0 @@
-use std::borrow::Cow;
-use nom::{
-    IResult,
-    character::complete::space1,
-    bytes::complete::is_not,
-    combinator::{all_consuming, recognize},
-    multi::{fold_many0, many0, many1},
-    sequence::{pair, tuple},
-};
-
-use crate::multipass::guess_charset::GuessCharset;
-use crate::error::IMFError;
-use crate::fragments::whitespace;
-
-#[derive(Debug, PartialEq)]
-pub struct ExtractFields<'a> {
-    pub fields: Vec<&'a str>,
-    pub body: &'a [u8],
-}
-
-impl<'a> TryFrom<&'a GuessCharset<'a>> for ExtractFields<'a> {
-    type Error = IMFError<'a>;
-
-    fn try_from(gcha: &'a GuessCharset<'a>) -> Result<Self, Self::Error> {
-        all_consuming(many0(foldable_line))(&gcha.header)
-            .map_err(|e| IMFError::ExtractFields(e))
-            .map(|(_, fields)| ExtractFields { fields, body: gcha.body })
-    }
-}
-
-/// ```abnf
-/// fold_line = any *(1*(crlf WS) any) crlf
-/// ```
-fn foldable_line(input: &str) -> IResult<&str, &str> {
-    recognize(tuple((
-        is_not("\r\n"), 
-        many0(pair(
-                many1(pair(whitespace::perm_crlf, space1)), 
-                is_not("\r\n"))), 
-        whitespace::perm_crlf
-    )))(input)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_extract() {
-        assert_eq!(
-            ExtractFields::try_from(&GuessCharset {
-                header: "From: hello@world.com,\r\n\talice@wonderlands.com\r\nDate: 12 Mar 1997 07:33:25 Z\r\n".into(),
-                encoding: encoding_rs::UTF_8,
-                malformed: false,
-                body: b"Hello world!",
-            }),
-            Ok(ExtractFields {
-                fields: vec![
-                    "From: hello@world.com,\r\n\talice@wonderlands.com\r\n",
-                    "Date: 12 Mar 1997 07:33:25 Z\r\n",
-                ],
-                body: b"Hello world!",
-            })
-        );
-    }
-}

src/multipass/guess_charset.rs

@@ -1,51 +0,0 @@
-use std::borrow::Cow;
-use chardetng::EncodingDetector;
-use encoding_rs::Encoding;
-
-use crate::multipass::segment::Segment;
-
-#[derive(Debug, PartialEq)]
-pub struct GuessCharset<'a> {
-    pub header: Cow<'a, str>,
-    pub encoding: &'static Encoding,
-    pub malformed: bool,
-    pub body: &'a [u8],
-}
-
-const IS_LAST_BUFFER: bool = true;
-const ALLOW_UTF8: bool = true;
-const NO_TLD: Option<&[u8]> = None;
-
-impl<'a> From<&'a Segment<'a>> for GuessCharset<'a> {
-    fn from(seg: &'a Segment<'a>) -> Self {
-        // Create detector
-        let mut detector = EncodingDetector::new();
-        detector.feed(&seg.header, IS_LAST_BUFFER);
-
-        // Get encoding
-        let enc: &Encoding = detector.guess(NO_TLD, ALLOW_UTF8);
-        let (header, encoding, malformed) = enc.decode(&seg.header);
-
-        GuessCharset { header, encoding, malformed, body: seg.body }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_charset() {
-        assert_eq!(
-            GuessCharset::from(&Segment {
-                body: b"Hello world!", 
-                header: b"From: hello@world.com\r\nDate: 12 Mar 1997 07:33:25 Z\r\n",
-            }),
-            GuessCharset {
-                header: "From: hello@world.com\r\nDate: 12 Mar 1997 07:33:25 Z\r\n".into(),
-                encoding: encoding_rs::UTF_8,
-                malformed: false,
-                body: b"Hello world!",
-            });
-    }
-}

src/multipass/mod.rs

@@ -1,3 +0,0 @@
-pub mod segment;
-pub mod guess_charset;
-pub mod extract_fields;

src/multipass/segment.rs

@@ -1,61 +0,0 @@
-use std::convert::TryFrom;
-use nom::{
-    IResult,
-    branch::alt,
-    bytes::complete::{is_not, tag},
-    combinator::recognize,
-    sequence::{pair, terminated},
-    multi::many0,
-};
-
-use crate::error::IMFError;
-
-#[derive(Debug, PartialEq)]
-pub struct Segment<'a> {
-    pub header: &'a [u8],
-    pub body: &'a [u8],
-}
-
-const cr: u8 = 0x0D;
-const lf: u8 = 0x0A;
-const crlf: &[u8] = &[cr, lf];
-
-impl<'a> TryFrom<&'a [u8]> for Segment<'a> {
-    type Error = IMFError<'a>;
-
-    fn try_from(buffer: &'a [u8]) -> Result<Self, Self::Error> {
-        terminated(
-            recognize(many0(line)), 
-            obs_crlf
-        )(buffer)
-            .map_err(|e| IMFError::Segment(e))
-            .map(|(body, header)| Segment { header, body })
-    }
-}
-
-fn line(input: &[u8]) -> IResult<&[u8], (&[u8], &[u8])> {
-    pair(
-        is_not(crlf), 
-        obs_crlf,
-    )(input)
-}
-
-fn obs_crlf(input: &[u8]) -> IResult<&[u8], &[u8]> {
-    alt((tag(crlf), tag(&[cr]), tag(&[lf])))(input)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_segment() {
-        assert_eq!(
-            Segment::try_from(&b"From: hello@world.com\r\nDate: 12 Mar 1997 07:33:25 Z\r\n\r\nHello world!"[..]),
-            Ok(Segment {
-                body: b"Hello world!", 
-                header: b"From: hello@world.com\r\nDate: 12 Mar 1997 07:33:25 Z\r\n",
-            })
-        );
-    }
-}

src/parse.rs

@@ -1,22 +1,15 @@
-use imf_codec::fragments::header;
+//use imf_codec::fragments::section::Section;
+//use imf_codec::multipass::segment;
 use std::io;
 use std::io::Read;
 
-
 fn main() {
     // Read full mail in memory
     let mut rawmail = Vec::new();
     io::stdin().lock().read_to_end(&mut rawmail).unwrap();
 
-    // Parse it
+    let (_, eml) = eml_codec::parse_message(&rawmail).unwrap();
-    let (email, encoding, malformed) = header::from_bytes(&rawmail);
+    println!("{:#?}", eml);
-    println!("Encoding: {:?}, Malformed: {:?}", encoding, malformed);
+    assert!(eml.imf.date.is_some());
-
+    assert!(!eml.imf.from.is_empty());
-    let (input, hdrs) = header::section(&email).unwrap();
-
-    // Checks/debug
-    println!("{:?}", hdrs);
-    assert!(hdrs.date.is_some());
-    assert!(hdrs.from.len() > 0);
-    assert!(hdrs.bad_fields.len() == 0);
 }

src/part/composite.rs

@@ -0,0 +1,617 @@
+use nom::IResult;
+use std::fmt;
+
+use crate::header;
+use crate::imf;
+use crate::mime;
+use crate::part::{self, AnyPart};
+use crate::pointers;
+use crate::text::boundary::{boundary, Delimiter};
+
+//--- Multipart
+#[derive(PartialEq)]
+pub struct Multipart<'a> {
+    pub mime: mime::MIME<'a, mime::r#type::Multipart>,
+    pub children: Vec<AnyPart<'a>>,
+    pub raw_part_inner: &'a [u8],
+    pub raw_part_outer: &'a [u8],
+}
+impl<'a> fmt::Debug for Multipart<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("part::Multipart")
+            .field("mime", &self.mime)
+            .field("children", &self.children)
+            .field(
+                "raw_part_inner",
+                &String::from_utf8_lossy(self.raw_part_inner),
+            )
+            .field(
+                "raw_part_outer",
+                &String::from_utf8_lossy(self.raw_part_outer),
+            )
+            .finish()
+    }
+}
+impl<'a> Multipart<'a> {
+    pub fn preamble(&self) -> &'a [u8] {
+        pointers::parsed(self.raw_part_outer, self.raw_part_inner)
+    }
+    pub fn epilogue(&self) -> &'a [u8] {
+        pointers::rest(self.raw_part_outer, self.raw_part_inner)
+    }
+    pub fn preamble_and_body(&self) -> &'a [u8] {
+        pointers::with_preamble(self.raw_part_outer, self.raw_part_inner)
+    }
+    pub fn body_and_epilogue(&self) -> &'a [u8] {
+        pointers::with_epilogue(self.raw_part_outer, self.raw_part_inner)
+    }
+}
+
+pub fn multipart<'a>(
+    m: mime::MIME<'a, mime::r#type::Multipart>,
+) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], Multipart<'a>> {
+    let m = m.clone();
+
+    move |input| {
+        // init
+        let outer_orig = input;
+        let bound = m.interpreted_type.boundary.as_bytes();
+        let mut mparts: Vec<AnyPart> = vec![];
+
+        // skip preamble
+        let (mut input_loop, _) = part::part_raw(bound)(input)?;
+        let inner_orig = input_loop;
+
+        loop {
+            let input = match boundary(bound)(input_loop) {
+                Err(_) => {
+                    return Ok((
+                        input_loop,
+                        Multipart {
+                            mime: m.clone(),
+                            children: mparts,
+                            raw_part_inner: pointers::parsed(inner_orig, input_loop),
+                            raw_part_outer: pointers::parsed(outer_orig, input_loop),
+                        },
+                    ))
+                }
+                Ok((inp, Delimiter::Last)) => {
+                    return Ok((
+                        inp,
+                        Multipart {
+                            mime: m.clone(),
+                            children: mparts,
+                            raw_part_inner: pointers::parsed(inner_orig, inp),
+                            raw_part_outer: pointers::parsed(
+                                outer_orig,
+                                &outer_orig[outer_orig.len()..],
+                            ),
+                        },
+                    ))
+                }
+                Ok((inp, Delimiter::Next)) => inp,
+            };
+
+            // parse mime headers, otherwise pick default mime
+            let (input, naive_mime) = match header::header_kv(input) {
+                Ok((input_eom, fields)) => {
+                    let raw_hdrs = pointers::parsed(input, input_eom);
+                    let mime = fields
+                        .iter()
+                        .flat_map(mime::field::Content::try_from)
+                        .into_iter()
+                        .collect::<mime::NaiveMIME>();
+
+                    let mime = mime.with_kv(fields).with_raw(raw_hdrs);
+
+                    (input_eom, mime)
+                }
+                Err(_) => (input, mime::NaiveMIME::default()),
+            };
+
+            // interpret mime according to context
+            let mime = match m.interpreted_type.subtype {
+                mime::r#type::MultipartSubtype::Digest => naive_mime
+                    .to_interpreted::<mime::WithDigestDefault>()
+                    .into(),
+                _ => naive_mime
+                    .to_interpreted::<mime::WithGenericDefault>()
+                    .into(),
+            };
+
+            // parse raw part
+            let (input, rpart) = part::part_raw(bound)(input)?;
+
+            // parse mime body
+            // -- we do not keep the input as we are using the
+            // part_raw function as our cursor here.
+            let (_, part) = part::anypart(mime)(rpart)?;
+            mparts.push(part);
+
+            input_loop = input;
+        }
+    }
+}
+
+//--- Message
+
+#[derive(PartialEq)]
+pub struct Message<'a> {
+    pub mime: mime::MIME<'a, mime::r#type::DeductibleMessage>,
+    pub imf: imf::Imf<'a>,
+    pub child: Box<AnyPart<'a>>,
+
+    pub raw_part: &'a [u8],
+    pub raw_headers: &'a [u8],
+    pub raw_body: &'a [u8],
+}
+impl<'a> fmt::Debug for Message<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("part::Message")
+            .field("mime", &self.mime)
+            .field("imf", &self.imf)
+            .field("child", &self.child)
+            .field("raw_part", &String::from_utf8_lossy(self.raw_part))
+            .field("raw_headers", &String::from_utf8_lossy(self.raw_headers))
+            .field("raw_body", &String::from_utf8_lossy(self.raw_body))
+            .finish()
+    }
+}
+
+pub fn message<'a>(
+    m: mime::MIME<'a, mime::r#type::DeductibleMessage>,
+) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], Message<'a>> {
+    move |input: &[u8]| {
+        let orig = input;
+
+        // parse header fields
+        let (input, headers) = header::header_kv(input)?;
+
+        // extract raw parts 1/2
+        let raw_headers = pointers::parsed(orig, input);
+        let body_orig = input;
+
+        //---------------
+        // aggregate header fields
+        let (naive_mime, imf) = part::field::split_and_build(&headers);
+
+        // Bind headers to mime
+        let naive_mime = naive_mime.with_kv(headers);
+
+        // interpret headers to choose the child mime type
+        let in_mime = naive_mime
+            .with_raw(raw_headers)
+            .to_interpreted::<mime::WithGenericDefault>()
+            .into();
+        //---------------
+
+        // parse a part following this mime specification
+        let (input, part) = part::anypart(in_mime)(input)?;
+
+        // extract raw parts 2/2
+        let raw_body = pointers::parsed(body_orig, input);
+        let raw_part = pointers::parsed(orig, input);
+
+        Ok((
+            input,
+            Message {
+                mime: m.clone(),
+                imf,
+                raw_part,
+                raw_headers,
+                raw_body,
+                child: Box::new(part),
+            },
+        ))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::part::discrete::Text;
+    use crate::part::AnyPart;
+    use crate::text::encoding::{Base64Word, EncodedWord, QuotedChunk, QuotedWord};
+    use crate::text::misc_token::{MIMEWord, Phrase, UnstrToken, Unstructured, Word};
+    use crate::text::quoted::QuotedString;
+    use chrono::{FixedOffset, TimeZone};
+
+    #[test]
+    fn test_multipart() {
+        let base_mime = mime::MIME {
+            interpreted_type: mime::r#type::Multipart {
+                subtype: mime::r#type::MultipartSubtype::Alternative,
+                boundary: "simple boundary".to_string(),
+            },
+            fields: mime::NaiveMIME::default(),
+        };
+
+        let input = b"This is the preamble.  It is to be ignored, though it
+is a handy place for composition agents to include an
+explanatory note to non-MIME conformant readers.
+
+--simple boundary
+
+This is implicitly typed plain US-ASCII text.
+It does NOT end with a linebreak.
+--simple boundary
+Content-type: text/plain; charset=us-ascii
+
+This is explicitly typed plain US-ASCII text.
+It DOES end with a linebreak.
+
+--simple boundary--
+
+This is the epilogue. It is also to be ignored.
+";
+
+        let inner = b"
+--simple boundary
+
+This is implicitly typed plain US-ASCII text.
+It does NOT end with a linebreak.
+--simple boundary
+Content-type: text/plain; charset=us-ascii
+
+This is explicitly typed plain US-ASCII text.
+It DOES end with a linebreak.
+
+--simple boundary--
+";
+
+        assert_eq!(
+            multipart(base_mime.clone())(input),
+            Ok((&b"\nThis is the epilogue. It is also to be ignored.\n"[..],
+                Multipart {
+                    mime: base_mime,
+                    raw_part_outer: input,
+                    raw_part_inner: inner,
+                    children: vec![
+                        AnyPart::Txt(Text {
+                            mime: mime::MIME {
+                                interpreted_type: mime::r#type::Deductible::Inferred(mime::r#type::Text {
+                                    subtype: mime::r#type::TextSubtype::Plain,
+                                    charset: mime::r#type::Deductible::Inferred(mime::charset::EmailCharset::US_ASCII),
+                                }),
+                                fields: mime::NaiveMIME {
+                                    raw: &b"\n"[..],
+                                    ..mime::NaiveMIME::default()
+                                },
+                            },
+                            body: &b"This is implicitly typed plain US-ASCII text.\nIt does NOT end with a linebreak."[..],
+                        }),
+                        AnyPart::Txt(Text {
+                            mime: mime::MIME {
+                                interpreted_type: mime::r#type::Deductible::Explicit(mime::r#type::Text {
+                                    subtype: mime::r#type::TextSubtype::Plain,
+                                    charset: mime::r#type::Deductible::Explicit(mime::charset::EmailCharset::US_ASCII),
+                                }),
+                                fields: mime::NaiveMIME {
+                                    ctype: Some(mime::r#type::NaiveType {
+                                        main: &b"text"[..],
+                                        sub: &b"plain"[..],
+                                        params: vec![
+                                            mime::r#type::Parameter {
+                                                name: &b"charset"[..],
+                                                value: MIMEWord::Atom(&b"us-ascii"[..]),
+                                            }
+                                        ]
+                                    }),
+                                    raw: &b"Content-type: text/plain; charset=us-ascii\n\n"[..],
+                                    kv: vec![
+                                        header::Field::Good(header::Kv2(&b"Content-type"[..], &b"text/plain; charset=us-ascii"[..]))
+                                    ],
+                                    ..mime::NaiveMIME::default()
+                                },
+                            },
+                            body: &b"This is explicitly typed plain US-ASCII text.\nIt DOES end with a linebreak.\n"[..],
+                        }),
+                    ],
+                },
+            ))
+        );
+    }
+
+    #[test]
+    fn test_message() {
+        let fullmail: &[u8] = r#"Date: Sat, 8 Jul 2023 07:14:29 +0200
+From: Grrrnd Zero <grrrndzero@example.org>
+To: John Doe <jdoe@machine.example>
+CC: =?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>
+Subject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=
+    =?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=
+X-Unknown: something something
+Bad entry
+  on multiple lines
+Message-ID: <NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5@www.grrrndzero.org>
+MIME-Version: 1.0
+Content-Type: multipart/alternative;
+ boundary="b1_e376dc71bafc953c0b0fdeb9983a9956"
+Content-Transfer-Encoding: 7bit
+
+This is a multi-part message in MIME format.
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+GZ
+OoOoO
+oOoOoOoOo
+oOoOoOoOoOoOoOoOo
+oOoOoOoOoOoOoOoOoOoOoOo
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956
+Content-Type: text/html; charset=us-ascii
+
+<div style="text-align: center;"><strong>GZ</strong><br />
+OoOoO<br />
+oOoOoOoOo<br />
+oOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo<br />
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO<br />
+</div>
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956--
+"#
+        .as_bytes();
+
+        let hdrs = br#"Date: Sat, 8 Jul 2023 07:14:29 +0200
+From: Grrrnd Zero <grrrndzero@example.org>
+To: John Doe <jdoe@machine.example>
+CC: =?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>
+Subject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=
+    =?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=
+X-Unknown: something something
+Bad entry
+  on multiple lines
+Message-ID: <NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5@www.grrrndzero.org>
+MIME-Version: 1.0
+Content-Type: multipart/alternative;
+ boundary="b1_e376dc71bafc953c0b0fdeb9983a9956"
+Content-Transfer-Encoding: 7bit
+
+"#;
+
+        let body = br#"This is a multi-part message in MIME format.
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+GZ
+OoOoO
+oOoOoOoOo
+oOoOoOoOoOoOoOoOo
+oOoOoOoOoOoOoOoOoOoOoOo
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956
+Content-Type: text/html; charset=us-ascii
+
+<div style="text-align: center;"><strong>GZ</strong><br />
+OoOoO<br />
+oOoOoOoOo<br />
+oOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo<br />
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO<br />
+</div>
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956--
+"#;
+
+        let inner = br#"
+--b1_e376dc71bafc953c0b0fdeb9983a9956
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: quoted-printable
+
+GZ
+OoOoO
+oOoOoOoOo
+oOoOoOoOoOoOoOoOo
+oOoOoOoOoOoOoOoOoOoOoOo
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956
+Content-Type: text/html; charset=us-ascii
+
+<div style="text-align: center;"><strong>GZ</strong><br />
+OoOoO<br />
+oOoOoOoOo<br />
+oOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo<br />
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO<br />
+</div>
+
+--b1_e376dc71bafc953c0b0fdeb9983a9956--
+"#;
+
+        let base_mime = mime::MIME::<mime::r#type::DeductibleMessage>::default();
+        assert_eq!(
+            message(base_mime.clone())(fullmail),
+            Ok((
+                &[][..],
+                Message {
+                    mime: base_mime,
+                    raw_part: fullmail,
+                    raw_headers: hdrs,
+                    raw_body: body,
+                    imf: imf::Imf {
+                        date: Some(FixedOffset::east_opt(2 * 3600)
+                            .unwrap()
+                            .with_ymd_and_hms(2023, 07, 8, 7, 14, 29)
+                            .unwrap()),
+                        from: vec![
+                            imf::mailbox::MailboxRef {
+                                name: Some(Phrase(vec![Word::Atom(&b"Grrrnd"[..]), Word::Atom(&b"Zero"[..])])),
+                                addrspec: imf::mailbox::AddrSpec {
+                                    local_part: imf::mailbox::LocalPart(vec![
+                                        imf::mailbox::LocalPartToken::Word(Word::Atom(&b"grrrndzero"[..]))
+                                    ]),
+                                    domain: imf::mailbox::Domain::Atoms(vec![&b"example"[..], &b"org"[..]]),
+                                }
+                            },
+                        ],
+
+                        to: vec![imf::address::AddressRef::Single(imf::mailbox::MailboxRef {
+                                name: Some(Phrase(vec![Word::Atom(&b"John"[..]), Word::Atom(&b"Doe"[..])])),
+                                addrspec: imf::mailbox::AddrSpec {
+                                    local_part: imf::mailbox::LocalPart(vec![
+                                        imf::mailbox::LocalPartToken::Word(Word::Atom(&b"jdoe"[..]))
+                                    ]),
+                                    domain: imf::mailbox::Domain::Atoms(vec![&b"machine"[..], &b"example"[..]]),
+                                }
+                         })],
+
+                        cc: vec![imf::address::AddressRef::Single(imf::mailbox::MailboxRef {
+                            name: Some(Phrase(vec![
+                                Word::Encoded(EncodedWord::Quoted(QuotedWord {
+                                    enc: encoding_rs::WINDOWS_1252,
+                                    chunks: vec![
+                                        QuotedChunk::Safe(&b"Andr"[..]),
+                                        QuotedChunk::Encoded(vec![0xE9]),
+                                    ],
+                                })),
+                                Word::Atom(&b"Pirard"[..])
+                            ])),
+                            addrspec: imf::mailbox::AddrSpec {
+                                local_part: imf::mailbox::LocalPart(vec![
+                                    imf::mailbox::LocalPartToken::Word(Word::Atom(&b"PIRARD"[..]))
+                                ]),
+                                domain: imf::mailbox::Domain::Atoms(vec![
+                                    &b"vm1"[..], &b"ulg"[..], &b"ac"[..], &b"be"[..],
+                                ]),
+                            }
+                        })],
+
+                        subject: Some(Unstructured(vec![
+                            UnstrToken::Encoded(EncodedWord::Base64(Base64Word{
+                                enc: encoding_rs::WINDOWS_1252,
+                                content: &b"SWYgeW91IGNhbiByZWFkIHRoaXMgeW8"[..],
+                            })),
+                            UnstrToken::Encoded(EncodedWord::Base64(Base64Word{
+                                enc: encoding_rs::ISO_8859_2,
+                                content: &b"dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg"[..],
+                            })),
+                        ])),
+                        msg_id: Some(imf::identification::MessageID {
+                            left: &b"NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5"[..],
+                            right: &b"www.grrrndzero.org"[..],
+                        }),
+                        mime_version: Some(imf::mime::Version { major: 1, minor: 0}),
+                        ..imf::Imf::default()
+                    },
+                    child: Box::new(AnyPart::Mult(Multipart {
+                        mime: mime::MIME {
+                            interpreted_type: mime::r#type::Multipart {
+                                subtype: mime::r#type::MultipartSubtype::Alternative,
+                                boundary: "b1_e376dc71bafc953c0b0fdeb9983a9956".to_string(),
+                            },
+                            fields: mime::NaiveMIME {
+                                ctype: Some(mime::r#type::NaiveType {
+                                    main: &b"multipart"[..],
+                                    sub: &b"alternative"[..],
+                                    params: vec![
+                                        mime::r#type::Parameter {
+                                            name: &b"boundary"[..],
+                                            value: MIMEWord::Quoted(QuotedString(vec![&b"b1_e376dc71bafc953c0b0fdeb9983a9956"[..]])),
+                                        }
+                                    ]
+                                }),
+                                raw: hdrs,
+                                kv: vec![
+                                    header::Field::Good(header::Kv2(&b"Date"[..], &b"Sat, 8 Jul 2023 07:14:29 +0200"[..])),
+                                    header::Field::Good(header::Kv2(&b"From"[..], &b"Grrrnd Zero <grrrndzero@example.org>"[..])),
+                                    header::Field::Good(header::Kv2(&b"To"[..], &b"John Doe <jdoe@machine.example>"[..])),
+                                    header::Field::Good(header::Kv2(&b"CC"[..], &b"=?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>"[..])),
+                                    header::Field::Good(header::Kv2(&b"Subject"[..], &b"=?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=\n    =?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?="[..])),
+                                    header::Field::Good(header::Kv2(&b"X-Unknown"[..], &b"something something"[..])),
+                                    header::Field::Bad(&b"Bad entry\n  on multiple lines\n"[..]),
+                                    header::Field::Good(header::Kv2(&b"Message-ID"[..], &b"<NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5@www.grrrndzero.org>"[..])),
+                                    header::Field::Good(header::Kv2(&b"MIME-Version"[..], &b"1.0"[..])),
+                                    header::Field::Good(header::Kv2(&b"Content-Type"[..], &b"multipart/alternative;\n boundary=\"b1_e376dc71bafc953c0b0fdeb9983a9956\""[..])),
+                                    header::Field::Good(header::Kv2(&b"Content-Transfer-Encoding"[..], &b"7bit"[..])),
+                                ],
+                                ..mime::NaiveMIME::default()
+                            },
+                        },
+                        raw_part_inner: inner,
+                        raw_part_outer: body,
+                        children: vec![
+                            AnyPart::Txt(Text {
+                                mime: mime::MIME {
+                                    interpreted_type: mime::r#type::Deductible::Explicit(mime::r#type::Text {
+                                        subtype: mime::r#type::TextSubtype::Plain,
+                                        charset: mime::r#type::Deductible::Explicit(mime::charset::EmailCharset::UTF_8),
+                                    }),
+                                    fields: mime::NaiveMIME {
+                                        ctype: Some(mime::r#type::NaiveType {
+                                            main: &b"text"[..],
+                                            sub: &b"plain"[..],
+                                            params: vec![
+                                                mime::r#type::Parameter {
+                                                    name: &b"charset"[..],
+                                                    value: MIMEWord::Atom(&b"utf-8"[..]),
+                                                }
+                                            ]
+                                        }),
+                                        transfer_encoding: mime::mechanism::Mechanism::QuotedPrintable,
+                                        kv: vec![
+                                            header::Field::Good(header::Kv2(&b"Content-Type"[..], &b"text/plain; charset=utf-8"[..])),
+                                            header::Field::Good(header::Kv2(&b"Content-Transfer-Encoding"[..], &b"quoted-printable"[..])),
+                                        ],
+                                        raw: &b"Content-Type: text/plain; charset=utf-8\nContent-Transfer-Encoding: quoted-printable\n\n"[..],
+                                        ..mime::NaiveMIME::default()
+                                    }
+                                },
+                                body: &b"GZ\nOoOoO\noOoOoOoOo\noOoOoOoOoOoOoOoOo\noOoOoOoOoOoOoOoOoOoOoOo\noOoOoOoOoOoOoOoOoOoOoOoOoOoOo\nOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO\n"[..],
+                            }),
+                            AnyPart::Txt(Text {
+                                mime: mime::MIME {
+                                    interpreted_type: mime::r#type::Deductible::Explicit(mime::r#type::Text {
+                                        subtype: mime::r#type::TextSubtype::Html,
+                                        charset: mime::r#type::Deductible::Explicit(mime::charset::EmailCharset::US_ASCII),
+                                    }),
+
+                                    fields: mime::NaiveMIME {
+                                        ctype: Some(mime::r#type::NaiveType {
+                                            main: &b"text"[..],
+                                            sub: &b"html"[..],
+                                            params: vec![
+                                                mime::r#type::Parameter {
+                                                    name: &b"charset"[..],
+                                                    value: MIMEWord::Atom(&b"us-ascii"[..]),
+                                                }
+                                            ]
+                                        }),
+                                        kv: vec![
+                                            header::Field::Good(header::Kv2(&b"Content-Type"[..], &b"text/html; charset=us-ascii"[..])),
+                                        ],
+                                        raw: &b"Content-Type: text/html; charset=us-ascii\n\n"[..],
+                                        ..mime::NaiveMIME::default()
+                                    },
+                                },
+                                body: &br#"<div style="text-align: center;"><strong>GZ</strong><br />
+OoOoO<br />
+oOoOoOoOo<br />
+oOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOo<br />
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo<br />
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO<br />
+</div>
+"#[..],
+                            }),
+                        ],
+                    })),
+                },
+            ))
+        );
+    }
+}

src/part/discrete.rs

@@ -0,0 +1,33 @@
+use std::fmt;
+
+use crate::mime;
+
+#[derive(PartialEq)]
+pub struct Text<'a> {
+    pub mime: mime::MIME<'a, mime::r#type::DeductibleText>,
+    pub body: &'a [u8],
+}
+
+impl<'a> fmt::Debug for Text<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("part::Text")
+            .field("mime", &self.mime)
+            .field("body", &String::from_utf8_lossy(self.body))
+            .finish()
+    }
+}
+
+#[derive(PartialEq)]
+pub struct Binary<'a> {
+    pub mime: mime::MIME<'a, mime::r#type::Binary>,
+    pub body: &'a [u8],
+}
+
+impl<'a> fmt::Debug for Binary<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("part::Binary")
+            .field("mime", &self.mime)
+            .field("body", &String::from_utf8_lossy(self.body))
+            .finish()
+    }
+}

src/part/field.rs

@@ -0,0 +1,24 @@
+use crate::header;
+use crate::imf;
+use crate::mime;
+
+pub fn split_and_build<'a>(v: &Vec<header::Field<'a>>) -> (mime::NaiveMIME<'a>, imf::Imf<'a>) {
+    let (mimev, imfv) = v.iter().fold(
+        (
+            Vec::<mime::field::Content>::new(),
+            Vec::<imf::field::Field>::new(),
+        ),
+        |(mut mime, mut imf), f| {
+            if let Ok(m) = mime::field::Content::try_from(f) {
+                mime.push(m);
+            } else if let Ok(i) = imf::field::Field::try_from(f) {
+                imf.push(i);
+            }
+            (mime, imf)
+        },
+    );
+
+    let fmime = mimev.into_iter().collect::<mime::NaiveMIME>();
+    let fimf = imfv.into_iter().collect::<imf::Imf>();
+    (fmime, fimf)
+}

src/part/mod.rs

@@ -0,0 +1,171 @@
+/// Parts that contain other parts inside them
+pub mod composite;
+
+/// Parts that have a body and no child parts
+pub mod discrete;
+
+/// IMF + MIME fields parsed at once
+pub mod field;
+
+use nom::{
+    branch::alt,
+    bytes::complete::is_not,
+    combinator::{not, recognize},
+    multi::many0,
+    sequence::pair,
+    IResult,
+};
+
+use crate::mime;
+use crate::mime::{AnyMIME, NaiveMIME};
+use crate::part::{
+    composite::{message, multipart, Message, Multipart},
+    discrete::{Binary, Text},
+};
+use crate::text::ascii::CRLF;
+use crate::text::boundary::boundary;
+use crate::text::whitespace::obs_crlf;
+
+#[derive(Debug, PartialEq)]
+pub enum AnyPart<'a> {
+    Mult(Multipart<'a>),
+    Msg(Message<'a>),
+    Txt(Text<'a>),
+    Bin(Binary<'a>),
+}
+impl<'a> AnyPart<'a> {
+    pub fn as_multipart(&self) -> Option<&Multipart<'a>> {
+        match self {
+            Self::Mult(x) => Some(x),
+            _ => None,
+        }
+    }
+    pub fn as_message(&self) -> Option<&Message<'a>> {
+        match self {
+            Self::Msg(x) => Some(x),
+            _ => None,
+        }
+    }
+    pub fn as_text(&self) -> Option<&Text<'a>> {
+        match self {
+            Self::Txt(x) => Some(x),
+            _ => None,
+        }
+    }
+    pub fn as_binary(&self) -> Option<&Binary<'a>> {
+        match self {
+            Self::Bin(x) => Some(x),
+            _ => None,
+        }
+    }
+    pub fn mime(&self) -> &NaiveMIME<'a> {
+        match self {
+            Self::Mult(v) => &v.mime.fields,
+            Self::Msg(v) => &v.mime.fields,
+            Self::Txt(v) => &v.mime.fields,
+            Self::Bin(v) => &v.mime.fields,
+        }
+    }
+}
+impl<'a> From<Multipart<'a>> for AnyPart<'a> {
+    fn from(m: Multipart<'a>) -> Self {
+        Self::Mult(m)
+    }
+}
+impl<'a> From<Message<'a>> for AnyPart<'a> {
+    fn from(m: Message<'a>) -> Self {
+        Self::Msg(m)
+    }
+}
+
+/// Parse any type of part
+///
+/// ## Note
+///
+/// Multiparts are a bit special as they have a clearly delimited beginning
+/// and end contrary to all the other parts that are going up to the end of the buffer
+pub fn anypart<'a>(m: AnyMIME<'a>) -> impl FnOnce(&'a [u8]) -> IResult<&'a [u8], AnyPart<'a>> {
+    move |input| {
+        let part = match m {
+            AnyMIME::Mult(a) => multipart(a)(input)
+                .map(|(_, multi)| multi.into())
+                .unwrap_or(AnyPart::Txt(Text {
+                    mime: mime::MIME::<mime::r#type::DeductibleText>::default(),
+                    body: input,
+                })),
+            AnyMIME::Msg(a) => {
+                message(a)(input)
+                    .map(|(_, msg)| msg.into())
+                    .unwrap_or(AnyPart::Txt(Text {
+                        mime: mime::MIME::<mime::r#type::DeductibleText>::default(),
+                        body: input,
+                    }))
+            }
+            AnyMIME::Txt(a) => AnyPart::Txt(Text {
+                mime: a,
+                body: input,
+            }),
+            AnyMIME::Bin(a) => AnyPart::Bin(Binary {
+                mime: a,
+                body: input,
+            }),
+        };
+
+        // This function always consumes the whole input
+        Ok((&input[input.len()..], part))
+    }
+}
+
+pub fn part_raw<'a>(bound: &[u8]) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], &'a [u8]> + '_ {
+    move |input| {
+        recognize(many0(pair(
+            not(boundary(bound)),
+            alt((is_not(CRLF), obs_crlf)),
+        )))(input)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_preamble() {
+        assert_eq!(
+            part_raw(b"hello")(
+                b"blip
+bloup
+
+blip
+bloup--
+--bim
+--bim--
+
+--hello
+Field: Body
+"
+            ),
+            Ok((
+                &b"\n--hello\nField: Body\n"[..],
+                &b"blip\nbloup\n\nblip\nbloup--\n--bim\n--bim--\n"[..],
+            ))
+        );
+    }
+
+    #[test]
+    fn test_part_raw() {
+        assert_eq!(
+            part_raw(b"simple boundary")(b"Content-type: text/plain; charset=us-ascii
+
+This is explicitly typed plain US-ASCII text.
+It DOES end with a linebreak.
+
+--simple boundary--
+"),
+            Ok((
+                &b"\n--simple boundary--\n"[..], 
+                &b"Content-type: text/plain; charset=us-ascii\n\nThis is explicitly typed plain US-ASCII text.\nIt DOES end with a linebreak.\n"[..],
+            ))
+        );
+    }
+}

src/pointers.rs

@@ -0,0 +1,55 @@
+pub fn parsed<'a>(input: &'a [u8], rest: &'a [u8]) -> &'a [u8] {
+    let start = input.as_ptr();
+    let offset = rest.as_ptr();
+    let idx = (offset as usize - start as usize) / std::mem::size_of::<u8>();
+    assert!(idx <= input.len());
+    &input[..idx]
+}
+
+pub fn rest<'a>(input: &'a [u8], parsed: &'a [u8]) -> &'a [u8] {
+    let start = input.as_ptr();
+    let offset = (&parsed[parsed.len()..]).as_ptr();
+    let idx = (offset as usize - start as usize) / std::mem::size_of::<u8>();
+    assert!(idx <= input.len());
+    &input[idx..]
+}
+
+pub fn with_preamble<'a>(input: &'a [u8], parsed: &'a [u8]) -> &'a [u8] {
+    let start = input.as_ptr();
+    let offset = (&parsed[parsed.len()..]).as_ptr();
+    let idx = (offset as usize - start as usize) / std::mem::size_of::<u8>();
+    assert!(idx <= input.len());
+    &input[..idx]
+}
+
+pub fn with_epilogue<'a>(input: &'a [u8], rest: &'a [u8]) -> &'a [u8] {
+    let start = input.as_ptr();
+    let offset = rest.as_ptr();
+    let idx = (offset as usize - start as usize) / std::mem::size_of::<u8>();
+    assert!(idx <= input.len());
+    &input[idx..]
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_all() {
+        let outer = b"aa bb cc";
+        let inner = &outer[3..5];
+        assert_eq!(inner, b"bb");
+
+        let p = parsed(outer, inner);
+        assert_eq!(p, b"aa ");
+
+        let r = rest(outer, inner);
+        assert_eq!(r, b" cc");
+
+        let wp = with_preamble(outer, inner);
+        assert_eq!(wp, b"aa bb");
+
+        let we = with_epilogue(outer, inner);
+        assert_eq!(we, b"bb cc");
+    }
+}

src/text/ascii.rs

@@ -0,0 +1,149 @@
+#![allow(dead_code)]
+
+// ASCII
+// -- CONTROL CHARACTERS
+pub const NULL: u8 = 0x00; // NULL
+pub const SOH: u8 = 0x01; // START OF HEADER
+pub const STX: u8 = 0x02; // START OF TEXT
+pub const ETX: u8 = 0x03; // END OF TEXT
+pub const EOT: u8 = 0x04; //
+pub const ANQ: u8 = 0x05;
+pub const ACK: u8 = 0x06;
+pub const BEL: u8 = 0x07;
+pub const BS: u8 = 0x08; // BACKSPACE
+pub const HT: u8 = 0x09; // horizontal tab
+pub const LF: u8 = 0x0A;
+pub const VT: u8 = 0x0B;
+pub const FF: u8 = 0x0C;
+pub const CR: u8 = 0x0D;
+pub const SO: u8 = 0x0E;
+pub const SI: u8 = 0x0F;
+pub const DLE: u8 = 0x10;
+pub const DC1: u8 = 0x11;
+pub const DC2: u8 = 0x12;
+pub const DC3: u8 = 0x13;
+pub const DC4: u8 = 0x14;
+pub const NAK: u8 = 0x15;
+pub const SYN: u8 = 0x16;
+pub const ETB: u8 = 0x17;
+pub const CAN: u8 = 0x18;
+pub const EM: u8 = 0x19;
+pub const SUB: u8 = 0x1A;
+pub const ESC: u8 = 0x1B;
+pub const FS: u8 = 0x1C;
+pub const GS: u8 = 0x1D;
+pub const RS: u8 = 0x1E;
+pub const US: u8 = 0x1F;
+pub const DEL: u8 = 0x7F;
+
+// --  GRAPHIC CHARACTERS
+pub const SP: u8 = 0x20; // space
+pub const EXCLAMATION: u8 = 0x21; // !
+pub const DQUOTE: u8 = 0x22; // "
+pub const NUM: u8 = 0x23; // #
+pub const DOLLAR: u8 = 0x24; // $
+pub const PERCENT: u8 = 0x25; // %
+pub const AMPERSAND: u8 = 0x26; // &
+pub const SQUOTE: u8 = 0x27; // '
+pub const LEFT_PAR: u8 = 0x28; // (
+pub const RIGHT_PAR: u8 = 0x29; // )
+pub const ASTERISK: u8 = 0x2A; // *
+pub const PLUS: u8 = 0x2B; // +
+pub const COMMA: u8 = 0x2C; // ,
+pub const MINUS: u8 = 0x2D; // -
+pub const PERIOD: u8 = 0x2E; // .
+pub const SLASH: u8 = 0x2F; // /
+pub const N0: u8 = 0x30; // 0
+pub const N1: u8 = 0x31; // 1
+pub const N2: u8 = 0x32; // 2
+pub const N3: u8 = 0x33; // 3
+pub const N4: u8 = 0x34; // 4
+pub const N5: u8 = 0x35; // 5
+pub const N6: u8 = 0x36; // 6
+pub const N7: u8 = 0x37; // 7
+pub const N8: u8 = 0x38; // 8
+pub const N9: u8 = 0x39; // 9
+pub const COL: u8 = 0x3A; // :
+pub const SEM_COL: u8 = 0x3B; // ;
+pub const LT: u8 = 0x3C; // <
+pub const EQ: u8 = 0x3D; // =
+pub const GT: u8 = 0x3E; // >
+pub const QUESTION: u8 = 0x3F; // ?
+pub const AT: u8 = 0x40; // @
+pub const LCA: u8 = 0x41; // A
+pub const LCB: u8 = 0x42; // B
+pub const LCC: u8 = 0x43; // C
+pub const LCD: u8 = 0x44; // D
+pub const LCE: u8 = 0x45; // E
+pub const LCF: u8 = 0x46; // F
+pub const LCG: u8 = 0x47; // G
+pub const LCH: u8 = 0x48; // H
+pub const LCI: u8 = 0x49; // I
+pub const LCJ: u8 = 0x4A; // J
+pub const LCK: u8 = 0x4B; // K
+pub const LCL: u8 = 0x4C; // L
+pub const LCM: u8 = 0x4D; // M
+pub const LCN: u8 = 0x4E; // N
+pub const LCO: u8 = 0x4F; // O
+pub const LCP: u8 = 0x50; // P
+pub const LCQ: u8 = 0x51; // Q
+pub const LCR: u8 = 0x52; // R
+pub const LCS: u8 = 0x53; // S
+pub const LCT: u8 = 0x54; // T
+pub const LCU: u8 = 0x55; // U
+pub const LCV: u8 = 0x56; // V
+pub const LCW: u8 = 0x57; // W
+pub const LCX: u8 = 0x58; // X
+pub const LCY: u8 = 0x59; // Y
+pub const LCZ: u8 = 0x5A; // Z
+pub const LEFT_BRACKET: u8 = 0x5B; // [
+pub const BACKSLASH: u8 = 0x5C; // \
+pub const RIGHT_BRACKET: u8 = 0x5D; // ]
+pub const CARRET: u8 = 0x5E; // ^
+pub const UNDERSCORE: u8 = 0x5F; // _
+pub const GRAVE: u8 = 0x60; // `
+pub const LSA: u8 = 0x61; // a
+pub const LSB: u8 = 0x62; // b
+pub const LSC: u8 = 0x63; // c
+pub const LSD: u8 = 0x64; // d
+pub const LSE: u8 = 0x65; // e
+pub const LSF: u8 = 0x66; // f
+pub const LSG: u8 = 0x67; // g
+pub const LSH: u8 = 0x68; // h
+pub const LSI: u8 = 0x69; // i
+pub const LSJ: u8 = 0x6A; // j
+pub const LSK: u8 = 0x6B; // k
+pub const LSL: u8 = 0x6C; // l
+pub const LSM: u8 = 0x6D; // m
+pub const LSN: u8 = 0x6E; // n
+pub const LSO: u8 = 0x6F; // o
+pub const LSP: u8 = 0x70; // p
+pub const LSQ: u8 = 0x71; // q
+pub const LSR: u8 = 0x72; // r
+pub const LSS: u8 = 0x73; // s
+pub const LST: u8 = 0x74; // t
+pub const LSU: u8 = 0x75; // u
+pub const LSV: u8 = 0x76; // v
+pub const LSW: u8 = 0x77; // w
+pub const LSX: u8 = 0x78; // x
+pub const LSY: u8 = 0x79; // y
+pub const LSZ: u8 = 0x7A; // z
+pub const LEFT_CURLY: u8 = 0x7B; // {
+pub const PIPE: u8 = 0x7C; // |
+pub const RIGHT_CURLY: u8 = 0x7D; // }
+pub const TILDE: u8 = 0x7E; // ~
+
+// GROUP OF CHARACTERS
+// -- CRLF
+pub const CRLF: &[u8] = &[CR, LF];
+// -- CRCRLF
+// Sometimes portable libraries replace transparently
+// the "\n" with "\r\n" on Windows. When developpers
+// explicitly write "\r\n", the library generates "\r\r\n".
+pub const CRCRLF: &[u8] = &[CR, CR, LF];
+
+// -- WHITESPACE
+pub const WS: &[u8] = &[HT, SP];
+
+pub const GRAPHIC_BEGIN: u8 = SP;
+pub const GRAPHIC_END: u8 = TILDE;

src/text/boundary.rs

@@ -0,0 +1,52 @@
+use nom::{
+    branch::alt,
+    bytes::complete::tag,
+    combinator::{eof, opt},
+    sequence::tuple,
+    IResult,
+};
+
+use crate::text::whitespace::obs_crlf;
+
+#[derive(Debug, PartialEq)]
+pub enum Delimiter {
+    Next,
+    Last,
+}
+
+pub fn boundary<'a>(boundary: &[u8]) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], Delimiter> + '_ {
+    move |input: &[u8]| {
+        let (rest, (_, _, _, last, _)) = tuple((
+            opt(obs_crlf),
+            tag(b"--"),
+            tag(boundary),
+            opt(tag(b"--")),
+            alt((obs_crlf, eof)),
+        ))(input)?;
+        match last {
+            Some(_) => Ok((rest, Delimiter::Last)),
+            None => Ok((rest, Delimiter::Next)),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_boundary_next() {
+        assert_eq!(
+            boundary(b"hello")(b"\r\n--hello\r\n"),
+            Ok((&b""[..], Delimiter::Next))
+        );
+    }
+
+    #[test]
+    fn test_boundary_last() {
+        assert_eq!(
+            boundary(b"hello")(b"\r\n--hello--\r\n"),
+            Ok((&b""[..], Delimiter::Last))
+        );
+    }
+}

src/text/encoding.rs

@@ -0,0 +1,232 @@
+use encoding_rs::Encoding;
+
+use base64::{engine::general_purpose, Engine as _};
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take, take_while, take_while1},
+    character::complete::one_of,
+    character::is_alphanumeric,
+    combinator::{map, opt},
+    multi::{many0, many1},
+    sequence::{preceded, terminated, tuple},
+    IResult,
+};
+
+use crate::text::ascii;
+use crate::text::whitespace::cfws;
+use crate::text::words;
+
+pub fn encoded_word(input: &[u8]) -> IResult<&[u8], EncodedWord> {
+    alt((encoded_word_quoted, encoded_word_base64))(input)
+}
+
+pub fn encoded_word_quoted(input: &[u8]) -> IResult<&[u8], EncodedWord> {
+    let (rest, (_, _, charset, _, _, _, txt, _, _)) = tuple((
+        opt(cfws),
+        tag("=?"),
+        words::mime_atom,
+        tag("?"),
+        one_of("Qq"),
+        tag("?"),
+        ptext,
+        tag("?="),
+        opt(cfws),
+    ))(input)?;
+
+    let renc = Encoding::for_label(charset).unwrap_or(encoding_rs::WINDOWS_1252);
+    let parsed = EncodedWord::Quoted(QuotedWord {
+        enc: renc,
+        chunks: txt,
+    });
+    Ok((rest, parsed))
+}
+
+pub fn encoded_word_base64(input: &[u8]) -> IResult<&[u8], EncodedWord> {
+    let (rest, (_, charset, _, _, _, txt, _)) = tuple((
+        tag("=?"),
+        words::mime_atom,
+        tag("?"),
+        one_of("Bb"),
+        tag("?"),
+        btext,
+        tag("?="),
+    ))(input)?;
+
+    let renc = Encoding::for_label(charset).unwrap_or(encoding_rs::WINDOWS_1252);
+    let parsed = EncodedWord::Base64(Base64Word {
+        enc: renc,
+        content: txt,
+    });
+    Ok((rest, parsed))
+}
+
+#[derive(PartialEq, Debug, Clone)]
+pub enum EncodedWord<'a> {
+    Quoted(QuotedWord<'a>),
+    Base64(Base64Word<'a>),
+}
+impl<'a> EncodedWord<'a> {
+    pub fn to_string(&self) -> String {
+        match self {
+            EncodedWord::Quoted(v) => v.to_string(),
+            EncodedWord::Base64(v) => v.to_string(),
+        }
+    }
+}
+
+#[derive(PartialEq, Debug, Clone)]
+pub struct Base64Word<'a> {
+    pub enc: &'static Encoding,
+    pub content: &'a [u8],
+}
+
+impl<'a> Base64Word<'a> {
+    pub fn to_string(&self) -> String {
+        general_purpose::STANDARD_NO_PAD
+            .decode(self.content)
+            .map(|d| self.enc.decode(d.as_slice()).0.to_string())
+            .unwrap_or("".into())
+    }
+}
+
+#[derive(PartialEq, Debug, Clone)]
+pub struct QuotedWord<'a> {
+    pub enc: &'static Encoding,
+    pub chunks: Vec<QuotedChunk<'a>>,
+}
+
+impl<'a> QuotedWord<'a> {
+    pub fn to_string(&self) -> String {
+        self.chunks.iter().fold(String::new(), |mut acc, c| {
+            match c {
+                QuotedChunk::Safe(v) => {
+                    let (content, _) = encoding_rs::UTF_8.decode_without_bom_handling(v);
+                    acc.push_str(content.as_ref());
+                }
+                QuotedChunk::Space => acc.push(' '),
+                QuotedChunk::Encoded(v) => {
+                    let (d, _) = self.enc.decode_without_bom_handling(v.as_slice());
+                    acc.push_str(d.as_ref());
+                }
+            };
+            acc
+        })
+    }
+}
+
+#[derive(PartialEq, Debug, Clone)]
+pub enum QuotedChunk<'a> {
+    Safe(&'a [u8]),
+    Encoded(Vec<u8>),
+    Space,
+}
+
+//quoted_printable
+pub fn ptext(input: &[u8]) -> IResult<&[u8], Vec<QuotedChunk>> {
+    many0(alt((safe_char2, encoded_space, many_hex_octet)))(input)
+}
+
+fn safe_char2(input: &[u8]) -> IResult<&[u8], QuotedChunk> {
+    map(take_while1(is_safe_char2), QuotedChunk::Safe)(input)
+}
+
+/// RFC2047 section 4.2
+/// 8-bit values which correspond to printable ASCII characters other
+/// than "=", "?", and "_" (underscore), MAY be represented as those
+/// characters.
+fn is_safe_char2(c: u8) -> bool {
+    c >= ascii::SP && c != ascii::UNDERSCORE && c != ascii::QUESTION && c != ascii::EQ
+}
+
+fn encoded_space(input: &[u8]) -> IResult<&[u8], QuotedChunk> {
+    map(tag("_"), |_| QuotedChunk::Space)(input)
+}
+
+fn hex_octet(input: &[u8]) -> IResult<&[u8], u8> {
+    use nom::error::*;
+
+    let (rest, hbytes) = preceded(tag("="), take(2usize))(input)?;
+
+    let hstr = String::from_utf8_lossy(hbytes);
+    let parsed = u8::from_str_radix(hstr.as_ref(), 16)
+        .map_err(|_| nom::Err::Error(Error::new(input, ErrorKind::Verify)))?;
+
+    Ok((rest, parsed))
+}
+
+fn many_hex_octet(input: &[u8]) -> IResult<&[u8], QuotedChunk> {
+    map(many1(hex_octet), QuotedChunk::Encoded)(input)
+}
+
+//base64 (maybe use a crate)
+pub fn btext(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    terminated(take_while(is_bchar), many0(tag("=")))(input)
+}
+
+fn is_bchar(c: u8) -> bool {
+    is_alphanumeric(c) || c == ascii::PLUS || c == ascii::SLASH
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // =?iso8859-1?Q?Accus=E9_de_r=E9ception_(affich=E9)?=
+    #[test]
+    fn test_ptext() {
+        assert_eq!(
+            ptext(b"Accus=E9_de_r=E9ception_(affich=E9)"),
+            Ok((
+                &b""[..],
+                vec![
+                    QuotedChunk::Safe(&b"Accus"[..]),
+                    QuotedChunk::Encoded(vec![0xe9]),
+                    QuotedChunk::Space,
+                    QuotedChunk::Safe(&b"de"[..]),
+                    QuotedChunk::Space,
+                    QuotedChunk::Safe(&b"r"[..]),
+                    QuotedChunk::Encoded(vec![0xe9]),
+                    QuotedChunk::Safe(&b"ception"[..]),
+                    QuotedChunk::Space,
+                    QuotedChunk::Safe(&b"(affich"[..]),
+                    QuotedChunk::Encoded(vec![0xe9]),
+                    QuotedChunk::Safe(&b")"[..]),
+                ]
+            ))
+        );
+    }
+
+    #[test]
+    fn test_decode_word() {
+        assert_eq!(
+            encoded_word(b"=?iso8859-1?Q?Accus=E9_de_r=E9ception_(affich=E9)?=")
+                .unwrap()
+                .1
+                .to_string(),
+            "Accusé de réception (affiché)".to_string(),
+        );
+    }
+
+    // =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=
+    #[test]
+    fn test_decode_word_b64() {
+        assert_eq!(
+            encoded_word(b"=?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=")
+                .unwrap()
+                .1
+                .to_string(),
+            "If you can read this yo".to_string(),
+        );
+    }
+
+    #[test]
+    fn test_strange_quoted() {
+        assert_eq!(
+            encoded_word(b"=?UTF-8?Q?John_Sm=C3=AEth?=")
+                .unwrap()
+                .1
+                .to_string(),
+            "John Smîth".to_string(),
+        );
+    }
+}

src/text/misc_token.rs

@@ -0,0 +1,224 @@
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take_while1},
+    character::complete::space0,
+    combinator::{map, opt},
+    multi::{many0, many1, separated_list1},
+    sequence::preceded,
+    IResult,
+};
+use std::fmt;
+
+use crate::text::{
+    ascii,
+    encoding::{self, encoded_word},
+    quoted::{quoted_string, QuotedString},
+    whitespace::{fws, is_obs_no_ws_ctl},
+    words::{atom, is_vchar, mime_atom},
+};
+
+#[derive(Debug, PartialEq, Default)]
+pub struct PhraseList<'a>(pub Vec<Phrase<'a>>);
+pub fn phrase_list(input: &[u8]) -> IResult<&[u8], PhraseList> {
+    map(separated_list1(tag(","), phrase), PhraseList)(input)
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum MIMEWord<'a> {
+    Quoted(QuotedString<'a>),
+    Atom(&'a [u8]),
+}
+impl Default for MIMEWord<'static> {
+    fn default() -> Self {
+        Self::Atom(&[])
+    }
+}
+impl<'a> MIMEWord<'a> {
+    pub fn to_string(&self) -> String {
+        match self {
+            Self::Quoted(v) => v.to_string(),
+            Self::Atom(v) => encoding_rs::UTF_8
+                .decode_without_bom_handling(v)
+                .0
+                .to_string(),
+        }
+    }
+}
+pub fn mime_word(input: &[u8]) -> IResult<&[u8], MIMEWord> {
+    alt((
+        map(quoted_string, MIMEWord::Quoted),
+        map(mime_atom, MIMEWord::Atom),
+    ))(input)
+}
+
+#[derive(PartialEq)]
+pub enum Word<'a> {
+    Quoted(QuotedString<'a>),
+    Encoded(encoding::EncodedWord<'a>),
+    Atom(&'a [u8]),
+}
+
+impl<'a> ToString for Word<'a> {
+    fn to_string(&self) -> String {
+        match self {
+            Word::Quoted(v) => v.to_string(),
+            Word::Encoded(v) => v.to_string(),
+            Word::Atom(v) => encoding_rs::UTF_8
+                .decode_without_bom_handling(v)
+                .0
+                .to_string(),
+        }
+    }
+}
+impl<'a> fmt::Debug for Word<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("Word")
+            .field(&format_args!("\"{}\"", self.to_string()))
+            .finish()
+    }
+}
+
+/// Word
+///
+/// ```abnf
+///    word            =   atom / quoted-string
+/// ```
+pub fn word(input: &[u8]) -> IResult<&[u8], Word> {
+    alt((
+        map(quoted_string, Word::Quoted),
+        map(encoded_word, Word::Encoded),
+        map(atom, Word::Atom),
+    ))(input)
+}
+
+#[derive(PartialEq)]
+pub struct Phrase<'a>(pub Vec<Word<'a>>);
+
+impl<'a> ToString for Phrase<'a> {
+    fn to_string(&self) -> String {
+        self.0
+            .iter()
+            .map(|v| v.to_string())
+            .collect::<Vec<String>>()
+            .join(" ")
+    }
+}
+impl<'a> fmt::Debug for Phrase<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("Phrase")
+            .field(&format_args!("\"{}\"", self.to_string()))
+            .finish()
+    }
+}
+
+/// Phrase
+///
+/// ```abnf
+///    phrase          =   1*word / obs-phrase
+/// ```
+pub fn phrase(input: &[u8]) -> IResult<&[u8], Phrase> {
+    let (input, phrase) = map(many1(word), Phrase)(input)?;
+    Ok((input, phrase))
+}
+
+/// Compatible unstructured input
+///
+/// ```abnf
+/// obs-utext       =   %d0 / obs-NO-WS-CTL / VCHAR
+/// ```
+fn is_unstructured(c: u8) -> bool {
+    is_vchar(c) || is_obs_no_ws_ctl(c) || c == ascii::NULL
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum UnstrToken<'a> {
+    Init,
+    Encoded(encoding::EncodedWord<'a>),
+    Plain(&'a [u8]),
+}
+
+impl<'a> ToString for UnstrToken<'a> {
+    fn to_string(&self) -> String {
+        match self {
+            UnstrToken::Init => "".into(),
+            UnstrToken::Encoded(e) => e.to_string(),
+            UnstrToken::Plain(e) => encoding_rs::UTF_8
+                .decode_without_bom_handling(e)
+                .0
+                .into_owned(),
+        }
+    }
+}
+
+#[derive(PartialEq, Clone)]
+pub struct Unstructured<'a>(pub Vec<UnstrToken<'a>>);
+
+impl<'a> ToString for Unstructured<'a> {
+    fn to_string(&self) -> String {
+        self.0
+            .iter()
+            .fold(
+                (&UnstrToken::Init, String::new()),
+                |(prev_token, mut result), current_token| {
+                    match (prev_token, current_token) {
+                        (UnstrToken::Init, v) => result.push_str(v.to_string().as_ref()),
+                        (UnstrToken::Encoded(_), UnstrToken::Encoded(v)) => {
+                            result.push_str(v.to_string().as_ref())
+                        }
+                        (_, v) => {
+                            result.push(' ');
+                            result.push_str(v.to_string().as_ref())
+                        }
+                    };
+
+                    (current_token, result)
+                },
+            )
+            .1
+    }
+}
+impl<'a> fmt::Debug for Unstructured<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_tuple("Unstructured")
+            .field(&format_args!("\"{}\"", self.to_string()))
+            .finish()
+    }
+}
+
+/// Unstructured header field body
+///
+/// ```abnf
+/// unstructured    =   (*([FWS] VCHAR_SEQ) *WSP) / obs-unstruct
+/// ```
+pub fn unstructured(input: &[u8]) -> IResult<&[u8], Unstructured> {
+    let (input, r) = many0(preceded(
+        opt(fws),
+        alt((
+            map(encoded_word, UnstrToken::Encoded),
+            map(take_while1(is_unstructured), UnstrToken::Plain),
+        )),
+    ))(input)?;
+
+    let (input, _) = space0(input)?;
+    Ok((input, Unstructured(r)))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_phrase() {
+        assert_eq!(
+            phrase(b"hello world").unwrap().1.to_string(),
+            "hello world".to_string(),
+        );
+        assert_eq!(
+            phrase(b"salut \"le\" monde").unwrap().1.to_string(),
+            "salut le monde".to_string(),
+        );
+
+        let (rest, parsed) = phrase(b"fin\r\n du\r\nmonde").unwrap();
+        assert_eq!(rest, &b"\r\nmonde"[..]);
+        assert_eq!(parsed.to_string(), "fin du".to_string());
+    }
+}

src/text/mod.rs

@@ -0,0 +1,7 @@
+pub mod ascii;
+pub mod boundary;
+pub mod encoding;
+pub mod misc_token;
+pub mod quoted;
+pub mod whitespace;
+pub mod words;

src/text/quoted.rs

@@ -0,0 +1,134 @@
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take, take_while1},
+    combinator::opt,
+    multi::many0,
+    sequence::{pair, preceded},
+    IResult,
+};
+
+use crate::text::ascii;
+use crate::text::whitespace::{cfws, fws, is_obs_no_ws_ctl};
+
+#[derive(Debug, PartialEq, Default, Clone)]
+pub struct QuotedString<'a>(pub Vec<&'a [u8]>);
+
+impl<'a> QuotedString<'a> {
+    pub fn push(&mut self, e: &'a [u8]) {
+        self.0.push(e)
+    }
+
+    pub fn to_string(&self) -> String {
+        let enc = encoding_rs::UTF_8;
+        let size = self.0.iter().fold(0, |acc, v| acc + v.len());
+
+        self.0
+            .iter()
+            .fold(String::with_capacity(size), |mut acc, v| {
+                let (content, _) = enc.decode_without_bom_handling(v);
+                acc.push_str(content.as_ref());
+                acc
+            })
+    }
+}
+
+/// Quoted pair
+///
+/// ```abnf
+///    quoted-pair     =   ("\" (VCHAR / WSP)) / obs-qp
+///    obs-qp          =   "\" (%d0 / obs-NO-WS-CTL / LF / CR)
+/// ```
+pub fn quoted_pair(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    preceded(tag(&[ascii::BACKSLASH]), take(1usize))(input)
+}
+
+/// Allowed characters in quote
+///
+/// ```abnf
+///   qtext           =   %d33 /             ; Printable US-ASCII
+///                       %d35-91 /          ;  characters not including
+///                       %d93-126 /         ;  "\" or the quote character
+///                       obs-qtext
+/// ```
+fn is_restr_qtext(c: u8) -> bool {
+    c == ascii::EXCLAMATION
+        || (ascii::NUM..=ascii::LEFT_BRACKET).contains(&c)
+        || (ascii::RIGHT_BRACKET..=ascii::TILDE).contains(&c)
+}
+
+fn is_qtext(c: u8) -> bool {
+    is_restr_qtext(c) || is_obs_no_ws_ctl(c)
+}
+
+/// Quoted pair content
+///
+/// ```abnf
+///   qcontent        =   qtext / quoted-pair
+/// ```
+fn qcontent(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    alt((take_while1(is_qtext), quoted_pair))(input)
+}
+
+/// Quoted string
+///
+/// ```abnf
+/// quoted-string   =   [CFWS]
+///                     DQUOTE *([FWS] qcontent) [FWS] DQUOTE
+///                     [CFWS]
+/// ```
+pub fn quoted_string(input: &[u8]) -> IResult<&[u8], QuotedString> {
+    let (input, _) = opt(cfws)(input)?;
+    let (input, _) = tag("\"")(input)?;
+    let (input, content) = many0(pair(opt(fws), qcontent))(input)?;
+
+    // Rebuild string
+    let mut qstring = content
+        .iter()
+        .fold(QuotedString::default(), |mut acc, (maybe_wsp, c)| {
+            if maybe_wsp.is_some() {
+                acc.push(&[ascii::SP]);
+            }
+            acc.push(c);
+            acc
+        });
+
+    let (input, maybe_wsp) = opt(fws)(input)?;
+    if maybe_wsp.is_some() {
+        qstring.push(&[ascii::SP]);
+    }
+
+    let (input, _) = tag("\"")(input)?;
+    let (input, _) = opt(cfws)(input)?;
+    Ok((input, qstring))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_quoted_string_parser() {
+        assert_eq!(
+            quoted_string(b" \"hello\\\"world\" ").unwrap().1,
+            QuotedString(vec![b"hello", &[ascii::DQUOTE], b"world"])
+        );
+
+        assert_eq!(
+            quoted_string(b"\"hello\r\n world\""),
+            Ok((
+                &b""[..],
+                QuotedString(vec![b"hello", &[ascii::SP], b"world"])
+            )),
+        );
+    }
+
+    use crate::text::ascii;
+
+    #[test]
+    fn test_quoted_string_object() {
+        assert_eq!(
+            QuotedString(vec![b"hello", &[ascii::SP], b"world"]).to_string(),
+            "hello world".to_string(),
+        );
+    }
+}

src/text/whitespace.rs

@@ -0,0 +1,192 @@
+use crate::text::ascii;
+use crate::text::encoding::encoded_word;
+use crate::text::quoted::quoted_pair;
+use nom::{
+    branch::alt,
+    bytes::complete::{is_not, tag, take_while1},
+    character::complete::{space0, space1},
+    combinator::{opt, recognize},
+    multi::{many0, many1},
+    sequence::{pair, tuple},
+    IResult,
+};
+
+/// Whitespace (space, new line, tab) content and
+/// delimited content (eg. comment, line, sections, etc.)
+
+/// Obsolete/Compatible CRLF
+///
+/// Theoretically, all lines must end with \r\n
+/// but some mail servers like Dovecot support malformated emails,
+/// for example with only \n eol. It works because
+/// \r or \n is allowed nowhere else, so we also add this support.
+
+pub fn obs_crlf(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    alt((
+        tag(ascii::CRLF),
+        tag(ascii::CRCRLF),
+        tag(&[ascii::CR]),
+        tag(&[ascii::LF]),
+    ))(input)
+}
+
+/// ```abnf
+/// fold_line = any *(1*(crlf WS) any) crlf
+/// ```
+pub fn foldable_line(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    recognize(tuple((
+        is_not(ascii::CRLF),
+        many0(pair(many1(pair(obs_crlf, space1)), is_not(ascii::CRLF))),
+        obs_crlf,
+    )))(input)
+}
+
+// --- whitespaces and comments
+
+// Note: WSP = SP / HTAB = %x20 / %x09
+// nom::*::space0 = *WSP
+// nom::*::space1 = 1*WSP
+
+/// Permissive foldable white space
+///
+/// Folding white space are used for long headers splitted on multiple lines.
+/// The obsolete syntax allowes multiple lines without content; implemented for compatibility
+/// reasons
+pub fn fws(input: &[u8]) -> IResult<&[u8], u8> {
+    let (input, _) = alt((recognize(many1(fold_marker)), space1))(input)?;
+    Ok((input, ascii::SP))
+}
+fn fold_marker(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    let (input, _) = space0(input)?;
+    let (input, _) = obs_crlf(input)?;
+    space1(input)
+}
+
+/// Folding White Space with Comment
+///
+/// Note: we drop the comments for now...  
+///
+/// ```abnf
+///   ctext           =   %d33-39 /          ; Printable US-ASCII
+///                       %d42-91 /          ;  characters not including
+///                       %d93-126 /         ;  "(", ")", or "\"
+///                       obs-ctext
+///
+///   ccontent        =   ctext / quoted-pair / comment
+///
+///   comment         =   "(" *([FWS] ccontent) [FWS] ")"
+///
+///   CFWS            =   (1*([FWS] comment) [FWS]) / FWS
+/// ```
+pub fn cfws(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    alt((recognize(comments), recognize(fws)))(input)
+}
+
+pub fn comments(input: &[u8]) -> IResult<&[u8], ()> {
+    let (input, _) = many1(tuple((opt(fws), comment)))(input)?;
+    let (input, _) = opt(fws)(input)?;
+    Ok((input, ()))
+}
+
+pub fn comment(input: &[u8]) -> IResult<&[u8], ()> {
+    let (input, _) = tag("(")(input)?;
+    let (input, _) = many0(tuple((opt(fws), ccontent)))(input)?;
+    let (input, _) = opt(fws)(input)?;
+    let (input, _) = tag(")")(input)?;
+    Ok((input, ()))
+}
+
+pub fn ccontent(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    alt((
+        ctext,
+        recognize(quoted_pair),
+        recognize(encoded_word),
+        recognize(comment),
+    ))(input)
+}
+
+pub fn ctext(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    take_while1(is_ctext)(input)
+}
+
+pub fn is_ctext(c: u8) -> bool {
+    is_restr_ctext(c) || is_obs_no_ws_ctl(c)
+}
+
+/// Check if it's a comment text character
+///
+/// ```abnf
+///   ctext           =   %d33-39 /          ; Printable US-ASCII
+///                       %d42-91 /          ;  characters not including
+///                       %d93-126 /         ;  "(", ")", or "\"
+///                       obs-ctext
+///```
+pub fn is_restr_ctext(c: u8) -> bool {
+    (ascii::EXCLAMATION..=ascii::SQUOTE).contains(&c)
+        || (ascii::ASTERISK..=ascii::LEFT_BRACKET).contains(&c)
+        || (ascii::RIGHT_BRACKET..=ascii::TILDE).contains(&c)
+}
+
+/// US ASCII control characters without effect
+///
+/// ```abnf
+///   obs-NO-WS-CTL   =   %d1-8 /            ; US-ASCII control
+///                       %d11 /             ;  characters that do not
+///                       %d12 /             ;  include the carriage
+///                       %d14-31 /          ;  return, line feed, and
+///                       %d127              ;  white space characters
+/// ```
+pub fn is_obs_no_ws_ctl(c: u8) -> bool {
+    (ascii::SOH..=ascii::BS).contains(&c)
+        || c == ascii::VT
+        || c == ascii::FF
+        || (ascii::SO..=ascii::US).contains(&c)
+        || c == ascii::DEL
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_obs_crlf() {
+        assert_eq!(obs_crlf(b"\rworld"), Ok((&b"world"[..], &b"\r"[..])));
+        assert_eq!(obs_crlf(b"\r\nworld"), Ok((&b"world"[..], &b"\r\n"[..])));
+        assert_eq!(obs_crlf(b"\nworld"), Ok((&b"world"[..], &b"\n"[..])));
+    }
+
+    #[test]
+    fn test_fws() {
+        assert_eq!(fws(b"\r\n world"), Ok((&b"world"[..], ascii::SP)));
+        assert_eq!(fws(b" \r\n \r\n world"), Ok((&b"world"[..], ascii::SP)));
+        assert_eq!(fws(b" world"), Ok((&b"world"[..], ascii::SP)));
+        assert!(fws(b"\r\nFrom: test").is_err());
+    }
+
+    #[test]
+    fn test_cfws() {
+        assert_eq!(
+            cfws(b"(A nice \\) chap) <pete(his account)@silly.test(his host)>"),
+            Ok((
+                &b"<pete(his account)@silly.test(his host)>"[..],
+                &b"(A nice \\) chap) "[..]
+            ))
+        );
+        assert_eq!(
+            cfws(b"(Chris's host.)public.example>,"),
+            Ok((&b"public.example>,"[..], &b"(Chris's host.)"[..]))
+        );
+        assert_eq!(
+            cfws(b"(double (comment) is fun) wouch"),
+            Ok((&b"wouch"[..], &b"(double (comment) is fun) "[..]))
+        );
+    }
+
+    #[test]
+    fn test_cfws_encoded_word() {
+        assert_eq!(
+            cfws(b"(=?US-ASCII?Q?Keith_Moore?=)"),
+            Ok((&b""[..], &b"(=?US-ASCII?Q?Keith_Moore?=)"[..])),
+        );
+    }
+}

src/text/words.rs

@@ -0,0 +1,134 @@
+use crate::text::ascii;
+use crate::text::whitespace::cfws;
+use nom::{
+    bytes::complete::{tag, take_while1},
+    character::is_alphanumeric,
+    combinator::{opt, recognize},
+    multi::many0,
+    sequence::{delimited, pair},
+    IResult,
+};
+
+pub fn is_vchar(c: u8) -> bool {
+    (ascii::EXCLAMATION..=ascii::TILDE).contains(&c)
+}
+
+/// MIME Token allowed characters
+///
+/// forbidden: ()<>@,;:\"/[]?=
+fn is_mime_atom_text(c: u8) -> bool {
+    is_alphanumeric(c)
+        || c == ascii::EXCLAMATION
+        || c == ascii::NUM
+        || c == ascii::DOLLAR
+        || c == ascii::PERCENT
+        || c == ascii::AMPERSAND
+        || c == ascii::SQUOTE
+        || c == ascii::ASTERISK
+        || c == ascii::PLUS
+        || c == ascii::MINUS
+        || c == ascii::PERIOD
+        || c == ascii::CARRET
+        || c == ascii::UNDERSCORE
+        || c == ascii::GRAVE
+        || c == ascii::LEFT_CURLY
+        || c == ascii::PIPE
+        || c == ascii::RIGHT_CURLY
+        || c == ascii::TILDE
+}
+
+/// MIME Token
+///
+/// `[CFWS] 1*token_text [CFWS]`
+pub fn mime_atom(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    delimited(opt(cfws), take_while1(is_mime_atom_text), opt(cfws))(input)
+}
+
+/// Atom allowed characters
+///
+/// authorized: !#$%&'*+-/=?^_`{|}~
+fn is_atext(c: u8) -> bool {
+    is_alphanumeric(c)
+        || c == ascii::EXCLAMATION
+        || c == ascii::NUM
+        || c == ascii::DOLLAR
+        || c == ascii::PERCENT
+        || c == ascii::AMPERSAND
+        || c == ascii::SQUOTE
+        || c == ascii::ASTERISK
+        || c == ascii::PLUS
+        || c == ascii::MINUS
+        || c == ascii::SLASH
+        || c == ascii::EQ
+        || c == ascii::QUESTION
+        || c == ascii::CARRET
+        || c == ascii::UNDERSCORE
+        || c == ascii::GRAVE
+        || c == ascii::LEFT_CURLY
+        || c == ascii::PIPE
+        || c == ascii::RIGHT_CURLY
+        || c == ascii::TILDE
+}
+
+/// Atom
+///
+/// `[CFWS] 1*atext [CFWS]`
+pub fn atom(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    delimited(opt(cfws), take_while1(is_atext), opt(cfws))(input)
+}
+
+/// dot-atom-text
+///
+/// `1*atext *("." 1*atext)`
+pub fn dot_atom_text(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    recognize(pair(
+        take_while1(is_atext),
+        many0(pair(tag("."), take_while1(is_atext))),
+    ))(input)
+}
+
+/// dot-atom
+///
+/// `[CFWS] dot-atom-text [CFWS]`
+#[allow(dead_code)]
+pub fn dot_atom(input: &[u8]) -> IResult<&[u8], &[u8]> {
+    delimited(opt(cfws), dot_atom_text, opt(cfws))(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_atext() {
+        assert!(is_atext(b'='));
+        assert!(is_atext(b'5'));
+        assert!(is_atext(b'Q'));
+        assert!(!is_atext(b' '));
+        //assert!(is_atext('É')); // support utf8
+    }
+
+    #[test]
+    fn test_atom() {
+        assert_eq!(
+            atom(b"(skip)  imf_codec (hidden) aerogramme"),
+            Ok((&b"aerogramme"[..], &b"imf_codec"[..]))
+        );
+    }
+
+    #[test]
+    fn test_dot_atom_text() {
+        assert_eq!(
+            dot_atom_text(b"quentin.dufour.io abcdef"),
+            Ok((&b" abcdef"[..], &b"quentin.dufour.io"[..]))
+        );
+    }
+
+    #[test]
+    fn test_dot_atom() {
+        assert_eq!(
+            dot_atom(b"   (skip) quentin.dufour.io abcdef"),
+            Ok((&b"abcdef"[..], &b"quentin.dufour.io"[..]))
+        );
+    }
+}

tests/enron.rs

@@ -1,124 +0,0 @@
-use std::collections::HashSet;
-use std::path::PathBuf;
-use std::fs::File;
-use std::io::Read;
-use imf_codec::fragments::header;
-use walkdir::WalkDir;
-
-
-#[test]
-#[ignore]
-fn test_enron500k() {
-    let mut d = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
-    d.push("resources/enron/maildir/");
-    let prefix_sz = d.as_path().to_str().unwrap().len();
-    //d.push("williams-w3/");
-
-    let known_bad_fields = HashSet::from([
-        "white-s/calendar/113.", // To: east <7..>
-                                         
-        "skilling-j/inbox/223.", // From: pep <performance.>
-                                         
-        "jones-t/all_documents/9806.", // To: <"tibor.vizkelety":@enron.com>
-        "jones-t/notes_inbox/3303.", // To: <"tibor.vizkelety":@enron.com>
-                                             
-        "lokey-t/calendar/33.", // A second Date entry for the calendar containing
-                                        // Date:       Monday, March 12
-                                        
-        "zipper-a/inbox/199.", // To: e-mail <mari.>
-
-        "dasovich-j/deleted_items/128.", // To: f62489 <g>
-        "dasovich-j/all_documents/677.", // To: w/assts <govt.>
-        "dasovich-j/all_documents/8984.", // To: <"ft.com.users":@enron.com>
-        "dasovich-j/all_documents/3514.", // To: <"ft.com.users":@enron.com>
-        "dasovich-j/all_documents/4467.", // To: <"ft.com.users":@enron.com>
-        "dasovich-j/all_documents/578.", // To: w/assts <govt.>
-        "dasovich-j/all_documents/3148.", // To: <"economist.com.readers":@enron.com>
-        "dasovich-j/all_documents/9953.", // To: <"economist.com.reader":@enron.com>
-        "dasovich-j/risk_analytics/3.", // To: w/assts <govt.>
-        "dasovich-j/notes_inbox/5391.", // To: <"ft.com.users":@enron.com>
-        "dasovich-j/notes_inbox/4952.", // To: <"economist.com.reader":@enron.com>
-        "dasovich-j/notes_inbox/2386.", // To: <"ft.com.users":@enron.com>
-        "dasovich-j/notes_inbox/1706.", // To: <"ft.com.users":@enron.com>
-        "dasovich-j/notes_inbox/1489.", // To: <"economist.com.readers":@enron.com>
-        "dasovich-j/notes_inbox/5.", // To: w/assts <govt.>
-
-        "kaminski-v/sites/19.", // To: <"the.desk":@enron.com>
-        "kaminski-v/sites/1.", // To: <"the.desk":@enron.com>
-        "kaminski-v/discussion_threads/5082.", // To: <"ft.com.users":@enron.com>
-        "kaminski-v/discussion_threads/4046.", // To: <"the.desk":@enron.com>
-        "kaminski-v/discussion_threads/4187.", // To: <"the.desk":@enron.com>
-        "kaminski-v/discussion_threads/8068.", // To: cats <breaktkhrough.>, risk <breakthrough.>, leaders <breaktkhrough.>
-        "kaminski-v/discussion_threads/7980.", // To: dogs <breakthrough.>, cats <breaktkhrough.>, risk <breakthrough.>,\r\n\tleaders <breaktkhrough.>
-        "kaminski-v/all_documents/5970.", //To: dogs <breakthrough.>, cats <breaktkhrough.>, risk <breakthrough.>,\r\n\tleaders <breaktkhrough.>
-        "kaminski-v/all_documents/5838.", // To + Cc: dogs <breakthrough.>, breakthrough.adm@enron.com, breakthrough.adm@enron.com,\r\n\tbreakthrough.adm@enron.com
-        "kaminski-v/all_documents/10070.", // To: <"ft.com.users":@enron.com>
-        "kaminski-v/all_documents/92.", // To: <"the.desk":@enron.com>
-        "kaminski-v/all_documents/276.", // To: <"the.desk":@enron.com>
-        "kaminski-v/technical/1.", // To: <"the.desk":@enron.com>
-        "kaminski-v/technical/7.", // To: <"the.desk":@enron.com>
-        "kaminski-v/notes_inbox/140.", // To: dogs <breakthrough.>, cats <breaktkhrough.>, risk <breakthrough.>,\r\n\tleaders <breaktkhrough.>
-        "kaminski-v/notes_inbox/95.", // To + CC failed: cats <breaktkhrough.>, risk <breakthrough.>, leaders <breaktkhrough.>
-
-        "kean-s/archiving/untitled/1232.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
-        "kean-s/archiving/untitled/1688.", // To: w/assts <govt.>
-        "kean-s/sent/198.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
-        "kean-s/reg_risk/9.", // To: w/assts <govt.>
-        "kean-s/discussion_threads/950.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
-        "kean-s/discussion_threads/577.", // To: w/assts <govt.>
-        "kean-s/calendar/untitled/1096.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
-        "kean-s/calendar/untitled/640.", // To: w/assts <govt.>
-        "kean-s/all_documents/640.", // To: w/assts <govt.>
-        "kean-s/all_documents/1095.", // To: w/assts <govt.>
-        "kean-s/attachments/2030.",  // To: w/assts <govt.>
-
-        "williams-w3/operations_committee_isas/10.", // To: z34655 <m>
-    ]);
-
-    let known_bad_from = HashSet::from([
-        "skilling-j/inbox/223.", // From: pep <performance.>
-    ]);
-
-    let mut i = 0;
-    for entry in WalkDir::new(d.as_path()).into_iter().filter_map(|file| file.ok()) {
-        if entry.metadata().unwrap().is_file() {
-            let mail_path = entry.path();
-            let suffix = &mail_path.to_str().unwrap()[prefix_sz..];
-
-            // read file
-            let mut raw = Vec::new();
-            let mut f = File::open(mail_path).unwrap();
-            f.read_to_end(&mut raw).unwrap();
-
-            // parse
-            let (email, encoding, malformed) = header::from_bytes(&raw);
-            //println!("Encoding: {:?}, Malformed: {:?}", encoding, malformed);
-
-            let (input, hdrs) = header::section(&email).unwrap();
-            //println!("{:?}", hdrs);
-            let ok_date = hdrs.date.is_some();
-            let ok_from = hdrs.from.len() > 0;
-            let ok_fields = hdrs.bad_fields.len() == 0;
-
-            let p = entry.path();
-            if !ok_date || !ok_from || !ok_fields {
-                println!("Issue with: {}", suffix);
-            }
-
-            assert!(ok_date);
-
-            if !known_bad_from.contains(suffix) {
-                assert!(ok_from);
-            }
-
-            if !known_bad_fields.contains(suffix) {
-                assert!(ok_fields);
-            }
-
-            i += 1;
-            if i % 1000 == 0 {
-                println!("Analyzed emails: {}", i);
-            }
-        } 
-    }
-}