wip encoding
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2 changed files with 87 additions and 0 deletions
85
src/fragments/encoding.rs
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85
src/fragments/encoding.rs
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@ -0,0 +1,85 @@
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use std::borrow::Cow;
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use nom::{
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IResult,
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branch::alt,
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bytes::complete::{tag, take_while1},
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character::complete::{hex_digit1, one_of},
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combinator::map,
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sequence::{preceded, tuple},
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multi::many0,
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};
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use crate::fragments::mime;
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pub fn encoded_word(input: &str) -> IResult<&str, Cow<str>> {
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let (rest, (_, charset, _, enc, _, txt, _)) = tuple((
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tag("=?"), mime::token, tag("?"), one_of("QBqb"), tag("?"), encoded_text, tag("?=")
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))(input)?;
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match enc {
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// quoted printable
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'q'|'Q' => todo!(),
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// base64
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'b'|'B' => todo!(),
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_ => unreachable!(),
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}
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}
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fn encoded_text(input: &str) -> IResult<&str, &str> {
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take_while1(is_encoded_text)(input)
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}
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fn is_encoded_text(c: char) -> bool {
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c.is_ascii() && !c.is_ascii_control() && !c.is_ascii_whitespace()
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}
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pub enum QuotedChunk<'a> {
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Safe(&'a str),
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Encoded(u8),
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}
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//quoted_printable
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pub fn ptext(input: &str) -> IResult<&str, Vec<QuotedChunk>> {
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many0(alt((safe_char, hex_octet)))(input)
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}
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fn safe_char(input: &str) -> IResult<&str, QuotedChunk> {
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map(take_while1(is_safe_char), |v| QuotedChunk::Safe(v))(input)
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}
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fn is_safe_char(c: char) -> bool {
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(c >= '\x21' && c <= '\x3c') ||
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(c >= '\x3e' && c <= '\x7e')
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}
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fn hex_octet(input: &str) -> IResult<&str, QuotedChunk> {
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use nom;
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use nom::error::*;
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let (rest, hstr) = preceded(tag("="), hex_digit1)(input)?;
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let parsed = u8::from_str_radix(hstr, 16)
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.map_err(|_| nom::Err::Error(Error::new(input, ErrorKind::Verify)))?;
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Ok((rest, QuotedChunk::Encoded(parsed)))
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}
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//base64 (maybe use a crate)
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#[cfg(test)]
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mod tests {
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use super::*;
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// =?iso8859-1?Q?Accus=E9_de_r=E9ception_(affich=E9)?=
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#[test]
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fn test_ptext() {
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assert_eq!(
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ptext("Accus=E9_de_r=E9ception_(affich=E9)"),
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vec![
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QuotedChunk::Safe("Accus"),
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]
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);
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}
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}
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@ -17,4 +17,6 @@ mod mailbox;
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pub mod section;
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pub mod trace;
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// MIME related
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pub mod mime;
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pub mod encoding;
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