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use std::io;
use std::mem;
use bytes::Bytes;
use solicit::StreamId;
use solicit::frame::flags::*;
#[macro_escape]
macro_rules! unpack_octets_4 {
($buf:expr, $offset:expr, $tip:ty) => (
(($buf[$offset + 0] as $tip) << 24) |
(($buf[$offset + 1] as $tip) << 16) |
(($buf[$offset + 2] as $tip) << 8) |
(($buf[$offset + 3] as $tip) << 0)
);
}
#[inline]
fn parse_stream_id(buf: &[u8]) -> u32 {
let unpacked = unpack_octets_4!(buf, 0, u32);
unpacked & !0x80000000
}
pub const FRAME_HEADER_LEN: usize = 9;
pub mod builder;
pub mod data;
pub mod headers;
pub mod rst_stream;
pub mod settings;
pub mod goaway;
pub mod ping;
pub mod window_update;
mod flags;
pub use self::builder::FrameBuilder;
pub use self::data::{DataFlag, DataFrame};
pub use self::headers::{HeadersFlag, HeadersFrame};
pub use self::rst_stream::RstStreamFrame;
pub use self::settings::{SettingsFlag, SettingsFrame, HttpSetting};
pub use self::goaway::GoawayFrame;
pub use self::ping::PingFrame;
pub use self::window_update::WindowUpdateFrame;
pub type FrameHeaderBuffer = [u8; 9];
pub type FrameHeader = (u32, u8, u8, u32);
pub fn unpack_header(header: &FrameHeaderBuffer) -> FrameHeader {
let length: u32 = ((header[0] as u32) << 16) | ((header[1] as u32) << 8) |
(header[2] as u32);
let frame_type = header[3];
let flags = header[4];
let stream_id = parse_stream_id(&header[5..]);
(length, frame_type, flags, stream_id)
}
pub fn pack_header(header: &FrameHeader) -> FrameHeaderBuffer {
let &(length, frame_type, flags, stream_id) = header;
[(((length >> 16) & 0x000000FF) as u8),
(((length >> 8) & 0x000000FF) as u8),
(((length ) & 0x000000FF) as u8),
frame_type,
flags,
(((stream_id >> 24) & 0x000000FF) as u8),
(((stream_id >> 16) & 0x000000FF) as u8),
(((stream_id >> 8) & 0x000000FF) as u8),
(((stream_id ) & 0x000000FF) as u8)]
}
fn parse_padded_payload(payload: Bytes) -> Option<(Bytes, u8)> {
if payload.len() == 0 {
return None;
}
let pad_len = payload[0] as usize;
if pad_len >= payload.len() {
return None;
}
Some((payload.slice(1, payload.len() - pad_len), pad_len as u8))
}
pub trait FrameIR {
fn serialize_into<B: FrameBuilder>(self, builder: &mut B) -> io::Result<()>;
fn serialize_into_vec(self) -> Vec<u8>
where Self : Sized
{
let mut buf = io::Cursor::new(Vec::with_capacity(16));
self.serialize_into(&mut buf).expect("serialize_into");
buf.into_inner()
}
}
pub trait Frame: Sized {
type FlagType: Flag;
fn from_raw(raw_frame: &RawFrame) -> Option<Self>;
fn is_set(&self, flag: Self::FlagType) -> bool;
fn get_stream_id(&self) -> StreamId;
fn get_header(&self) -> FrameHeader;
}
#[derive(PartialEq)]
#[derive(Debug)]
#[derive(Clone)]
pub struct RawFrame {
pub raw_content: Bytes,
}
pub struct RawFrameRef<'a> {
pub raw_content: &'a [u8],
}
impl RawFrame {
pub fn parse<B : Into<Bytes>>(into_buf: B) -> Option<RawFrame> {
let buf = into_buf.into();
if buf.len() < 9 {
return None;
}
let header = unpack_header(unsafe {
assert!(buf.len() >= 9);
mem::transmute(buf.as_ptr())
});
let payload_len = header.0 as usize;
if buf[9..].len() < payload_len {
return None;
}
let raw = &buf[..9 + payload_len];
Some(raw.into())
}
pub fn as_frame_ref(&self) -> RawFrameRef {
RawFrameRef {
raw_content: &self.raw_content,
}
}
pub fn frame_type(&self) -> u8 {
self.as_frame_ref().frame_type()
}
#[inline]
pub fn len(&self) -> usize {
self.raw_content.len()
}
pub fn serialize(&self) -> &Bytes {
&self.raw_content
}
pub fn header(&self) -> FrameHeader {
unpack_header(unsafe {
assert!(self.raw_content.len() >= 9);
mem::transmute(self.raw_content.as_ptr())
})
}
pub fn get_stream_id(&self) -> StreamId {
self.header().3
}
pub fn payload(&self) -> Bytes {
self.raw_content.slice_from(9)
}
}
impl<'a> RawFrameRef<'a> {
pub fn frame_type(&self) -> u8 {
self.raw_content[3]
}
}
impl AsRef<[u8]> for RawFrame {
fn as_ref(&self) -> &[u8] {
self.raw_content.as_ref()
}
}
impl From<Vec<u8>> for RawFrame {
fn from(raw: Vec<u8>) -> RawFrame {
RawFrame { raw_content: Bytes::from(raw) }
}
}
impl<'a> From<&'a [u8]> for RawFrame {
fn from(raw: &'a [u8]) -> RawFrame {
RawFrame { raw_content: Bytes::from(raw) }
}
}
impl FrameIR for RawFrame {
fn serialize_into<B: FrameBuilder>(self, b: &mut B) -> io::Result<()> {
b.write_header(self.header())?;
b.write_all(&self.payload())
}
}
#[cfg(test)]
mod tests {
use super::{unpack_header, pack_header, RawFrame, FrameIR};
use std::io;
#[test]
fn test_unpack_header() {
{
let header = [0; 9];
assert_eq!((0, 0, 0, 0), unpack_header(&header));
}
{
let header = [0, 0, 1, 2, 3, 0, 0, 0, 4];
assert_eq!((1, 2, 3, 4), unpack_header(&header));
}
{
let header = [0, 0, 1, 200, 100, 0, 0, 0, 4];
assert_eq!((1, 200, 100, 4), unpack_header(&header));
}
{
let header = [0, 0, 1, 0, 0, 0, 0, 0, 0];
assert_eq!((1, 0, 0, 0), unpack_header(&header));
}
{
let header = [0, 1, 0, 0, 0, 0, 0, 0, 0];
assert_eq!((256, 0, 0, 0), unpack_header(&header));
}
{
let header = [1, 0, 0, 0, 0, 0, 0, 0, 0];
assert_eq!((256 * 256, 0, 0, 0), unpack_header(&header));
}
{
let header = [0, 0, 0, 0, 0, 0, 0, 0, 1];
assert_eq!((0, 0, 0, 1), unpack_header(&header));
}
{
let header = [0xFF, 0xFF, 0xFF, 0, 0, 0, 0, 0, 1];
assert_eq!(((1 << 24) - 1, 0, 0, 1), unpack_header(&header));
}
{
let header = [0xFF, 0xFF, 0xFF, 0, 0, 1, 1, 1, 1];
assert_eq!(((1 << 24) - 1, 0, 0, 1 + (1 << 8) + (1 << 16) + (1 << 24)),
unpack_header(&header));
}
{
let header = [0, 0, 1, 0, 0, 0x80, 0, 0, 1];
assert_eq!((1, 0, 0, 1), unpack_header(&header));
}
}
#[test]
fn test_pack_header() {
{
let header = [0; 9];
assert_eq!(pack_header(&(0, 0, 0, 0)), header);
}
{
let header = [0, 0, 1, 2, 3, 0, 0, 0, 4];
assert_eq!(pack_header(&(1, 2, 3, 4)), header);
}
{
let header = [0, 0, 1, 200, 100, 0, 0, 0, 4];
assert_eq!(pack_header(&(1, 200, 100, 4)), header);
}
{
let header = [0, 0, 1, 0, 0, 0, 0, 0, 0];
assert_eq!(pack_header(&(1, 0, 0, 0)), header);
}
{
let header = [0, 1, 0, 0, 0, 0, 0, 0, 0];
assert_eq!(pack_header(&(256, 0, 0, 0)), header);
}
{
let header = [1, 0, 0, 0, 0, 0, 0, 0, 0];
assert_eq!(pack_header(&(256 * 256, 0, 0, 0)), header);
}
{
let header = [0, 0, 0, 0, 0, 0, 0, 0, 1];
assert_eq!(pack_header(&(0, 0, 0, 1)), header);
}
{
let header = [0xFF, 0xFF, 0xFF, 0, 0, 0, 0, 0, 1];
assert_eq!(pack_header(&((1 << 24) - 1, 0, 0, 1)), header);
}
{
let header = [0xFF, 0xFF, 0xFF, 0, 0, 1, 1, 1, 1];
let header_components = ((1 << 24) - 1, 0, 0, 1 + (1 << 8) + (1 << 16) + (1 << 24));
assert_eq!(pack_header(&header_components), header);
}
}
pub fn build_padded_frame_payload(data: &[u8], pad_len: u8) -> Vec<u8> {
let sz = 1 + data.len() + pad_len as usize;
let mut payload: Vec<u8> = Vec::with_capacity(sz);
payload.push(pad_len);
payload.extend(data.to_vec().into_iter());
for _ in 0..pad_len {
payload.push(0);
}
payload
}
#[test]
fn test_from_slice() {
let buf = &b""[..];
let frame = RawFrame::from(buf);
assert_eq!(frame.as_ref(), buf);
}
#[test]
fn test_raw_frame_serialize() {
let data = b"123";
let header = (data.len() as u32, 0x1, 0, 1);
let buf = {
let mut buf = Vec::new();
buf.extend(pack_header(&header).to_vec().into_iter());
buf.extend(data.to_vec().into_iter());
buf
};
let raw: RawFrame = buf.clone().into();
assert_eq!(raw.serialize().as_ref(), &buf[..]);
}
#[test]
fn test_raw_frame_as_frame_ir() {
let data = b"123";
let header = (data.len() as u32, 0x1, 0, 1);
let buf = {
let mut buf = Vec::new();
buf.extend(pack_header(&header).to_vec().into_iter());
buf.extend(data.to_vec().into_iter());
buf
};
let raw: RawFrame = buf.clone().into();
let mut serialized = io::Cursor::new(Vec::new());
raw.serialize_into(&mut serialized).unwrap();
assert_eq!(serialized.into_inner(), buf);
}
#[test]
fn test_raw_frame_len() {
{
let buf = b"123";
let frame = RawFrame::from(&buf[..]);
assert_eq!(buf.len(), frame.len());
}
{
let buf = vec![0, 0, 1, 0, 0, 0, 0, 0, 0];
let frame = RawFrame::from(&buf[..]);
assert_eq!(buf.len(), frame.len());
}
{
let buf = vec![0, 0, 1, 0, 0, 0, 0, 0, 0, 1];
let frame = RawFrame::from(&buf[..]);
assert_eq!(buf.len(), frame.len());
}
}
}