73 lines
1.8 KiB
Rust
73 lines
1.8 KiB
Rust
use crate::frame::*;
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#[derive(Debug, Eq, PartialEq)]
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pub struct Priority {
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stream_id: StreamId,
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dependency: StreamDependency,
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}
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#[derive(Debug, Eq, PartialEq)]
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pub struct StreamDependency {
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/// The ID of the stream dependency target
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dependency_id: StreamId,
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/// The weight for the stream. The value exposed (and set) here is always in
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/// the range [0, 255], instead of [1, 256] (as defined in section 5.3.2.)
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/// so that the value fits into a `u8`.
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weight: u8,
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/// True if the stream dependency is exclusive.
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is_exclusive: bool,
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}
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impl Priority {
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pub fn load(head: Head, payload: &[u8]) -> Result<Self, Error> {
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let dependency = StreamDependency::load(payload)?;
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if dependency.dependency_id() == head.stream_id() {
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return Err(Error::InvalidDependencyId);
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}
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Ok(Priority {
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stream_id: head.stream_id(),
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dependency,
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})
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}
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}
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impl<B> From<Priority> for Frame<B> {
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fn from(src: Priority) -> Self {
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Frame::Priority(src)
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}
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}
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// ===== impl StreamDependency =====
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impl StreamDependency {
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pub fn new(dependency_id: StreamId, weight: u8, is_exclusive: bool) -> Self {
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StreamDependency {
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dependency_id,
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weight,
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is_exclusive,
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}
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}
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pub fn load(src: &[u8]) -> Result<Self, Error> {
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if src.len() != 5 {
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return Err(Error::InvalidPayloadLength);
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}
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// Parse the stream ID and exclusive flag
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let (dependency_id, is_exclusive) = StreamId::parse(&src[..4]);
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// Read the weight
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let weight = src[4];
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Ok(StreamDependency::new(dependency_id, weight, is_exclusive))
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}
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pub fn dependency_id(&self) -> StreamId {
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self.dependency_id
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}
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}
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