68 lines
1.4 KiB
Rust
68 lines
1.4 KiB
Rust
use byteorder::{BigEndian, ByteOrder};
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use std::u32;
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#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
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pub struct StreamId(u32);
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const STREAM_ID_MASK: u32 = 1 << 31;
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impl StreamId {
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/// Parse the stream ID
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#[inline]
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pub fn parse(buf: &[u8]) -> (StreamId, bool) {
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let unpacked = BigEndian::read_u32(buf);
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let flag = unpacked & STREAM_ID_MASK == STREAM_ID_MASK;
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// Now clear the most significant bit, as that is reserved and MUST be
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// ignored when received.
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(StreamId(unpacked & !STREAM_ID_MASK), flag)
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}
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pub fn is_client_initiated(&self) -> bool {
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let id = self.0;
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id != 0 && id % 2 == 1
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}
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pub fn is_server_initiated(&self) -> bool {
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let id = self.0;
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id != 0 && id % 2 == 0
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}
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#[inline]
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pub fn zero() -> StreamId {
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StreamId(0)
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}
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#[inline]
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pub fn max() -> StreamId {
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StreamId(u32::MAX >> 1)
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}
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pub fn is_zero(&self) -> bool {
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self.0 == 0
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}
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pub fn increment(&mut self) {
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self.0 += 2;
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}
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}
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impl From<u32> for StreamId {
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fn from(src: u32) -> Self {
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assert_eq!(src & STREAM_ID_MASK, 0, "invalid stream ID -- MSB is set");
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StreamId(src)
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}
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}
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impl From<StreamId> for u32 {
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fn from(src: StreamId) -> Self {
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src.0
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}
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}
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impl PartialEq<u32> for StreamId {
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fn eq(&self, other: &u32) -> bool {
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self.0 == *other
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}
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}
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