Use BytesMut instead of Vec<u8> in bytes_buf (extend is probably faster)

src/bytes_buf.rs

@@ -1,5 +1,7 @@
 use std::collections::VecDeque;
 
+use bytes::BytesMut;
+
 pub use bytes::Bytes;
 
 /// A circular buffer of bytes, internally represented as a list of Bytes
@@ -48,13 +50,13 @@ impl BytesBuf {
 			self.buf_len = 0;
 			self.buf.pop_back().unwrap()
 		} else {
-			let mut ret = Vec::with_capacity(self.buf_len);
+			let mut ret = BytesMut::with_capacity(self.buf_len);
 			for b in self.buf.iter() {
-				ret.extend(&b[..]);
+				ret.extend_from_slice(&b[..]);
 			}
 			self.buf.clear();
 			self.buf_len = 0;
-			Bytes::from(ret)
+			ret.freeze()
 		}
 	}
 
@@ -88,23 +90,23 @@ impl BytesBuf {
 			self.buf_len -= len;
 			front
 		} else {
-			let mut ret = Vec::with_capacity(len);
+			let mut ret = BytesMut::with_capacity(len);
-			ret.extend(&front[..]);
+			ret.extend_from_slice(&front[..]);
 			self.buf_len -= front.len();
 			while ret.len() < len {
 				let front = self.buf.pop_front().unwrap();
 				if front.len() > len - ret.len() {
 					let take = len - ret.len();
-					ret.extend(front.slice(..take));
+					ret.extend_from_slice(&front[..take]);
 					self.buf.push_front(front.slice(take..));
 					self.buf_len -= take;
 					break;
 				} else {
-					ret.extend(&front[..]);
+					ret.extend_from_slice(&front[..]);
 					self.buf_len -= front.len();
 				}
 			}
-			Bytes::from(ret)
+			ret.freeze()
 		}
 	}
 

src/message.rs

@@ -52,7 +52,6 @@ pub struct OrderTag(pub(crate) u64, pub(crate) u64);
 #[derive(Clone, Copy)]
 pub struct OrderTagStream(u64);
 
-
 impl OrderTag {
 	/// Create a new stream from which to generate order tags. Example:
 	///	```