Remove byteorder-dependency (#392)

src/frame/headers.rs

@@ -5,7 +5,6 @@ use crate::hpack;
 use http::{uri, HeaderMap, Method, StatusCode, Uri};
 use http::header::{self, HeaderName, HeaderValue};
 
-use byteorder::{BigEndian, ByteOrder};
 use bytes::{Bytes, BytesMut};
 use string::String;
 
@@ -563,7 +562,9 @@ impl EncodingHeaderBlock {
         let payload_len = (dst.len() - payload_pos) as u64;
 
         // Write the frame length
-        BigEndian::write_uint(&mut dst[head_pos..head_pos + 3], payload_len, 3);
+        let payload_len_be = payload_len.to_be_bytes();
+        assert!(payload_len_be[0..5].iter().all(|b| *b == 0));
+        (&mut dst[head_pos..head_pos + 3]).copy_from_slice(&payload_len_be[5..]);
 
         if continuation.is_some() {
             // There will be continuation frames, so the `is_end_headers` flag

src/frame/stream_id.rs

@@ -1,4 +1,3 @@
-use byteorder::{BigEndian, ByteOrder};
 use std::u32;
 
 /// A stream identifier, as described in [Section 5.1.1] of RFC 7540.
@@ -29,7 +28,9 @@ impl StreamId {
     /// Parse the stream ID
     #[inline]
     pub fn parse(buf: &[u8]) -> (StreamId, bool) {
-        let unpacked = BigEndian::read_u32(buf);
+        let mut ubuf = [0; 4];
+        ubuf.copy_from_slice(&buf[0..4]);
+        let unpacked = u32::from_be_bytes(ubuf);
         let flag = unpacked & STREAM_ID_MASK == STREAM_ID_MASK;
 
         // Now clear the most significant bit, as that is reserved and MUST be