139 lines
3.0 KiB
Rust
139 lines
3.0 KiB
Rust
use std::fmt;
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use std::mem;
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use bytes::{Bytes, BytesMut, BufMut};
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/// A piece of a message body.
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pub struct Chunk(Inner);
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enum Inner {
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Mut(BytesMut),
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Shared(Bytes),
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Swapping,
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}
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impl Inner {
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fn as_bytes_mut(&mut self, reserve: usize) -> &mut BytesMut {
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match *self {
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Inner::Mut(ref mut bytes) => return bytes,
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_ => ()
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}
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let bytes = match mem::replace(self, Inner::Swapping) {
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Inner::Shared(bytes) => bytes,
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_ => unreachable!(),
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};
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let bytes_mut = bytes.try_mut().unwrap_or_else(|bytes| {
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let mut bytes_mut = BytesMut::with_capacity(reserve + bytes.len());
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bytes_mut.put_slice(bytes.as_ref());
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bytes_mut
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});
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*self = Inner::Mut(bytes_mut);
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match *self {
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Inner::Mut(ref mut bytes) => bytes,
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_ => unreachable!(),
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}
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}
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}
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impl From<Vec<u8>> for Chunk {
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#[inline]
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fn from(v: Vec<u8>) -> Chunk {
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Chunk::from(Bytes::from(v))
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}
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}
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impl From<&'static [u8]> for Chunk {
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#[inline]
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fn from(slice: &'static [u8]) -> Chunk {
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Chunk::from(Bytes::from_static(slice))
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}
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}
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impl From<String> for Chunk {
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#[inline]
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fn from(s: String) -> Chunk {
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s.into_bytes().into()
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}
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}
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impl From<&'static str> for Chunk {
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#[inline]
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fn from(slice: &'static str) -> Chunk {
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slice.as_bytes().into()
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}
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}
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impl From<Bytes> for Chunk {
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fn from(mem: Bytes) -> Chunk {
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Chunk(Inner::Shared(mem))
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}
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}
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impl From<Chunk> for Bytes {
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fn from(chunk: Chunk) -> Bytes {
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match chunk.0 {
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Inner::Mut(bytes_mut) => bytes_mut.freeze(),
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Inner::Shared(bytes) => bytes,
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Inner::Swapping => unreachable!(),
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}
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}
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}
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impl ::std::ops::Deref for Chunk {
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type Target = [u8];
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#[inline]
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fn deref(&self) -> &Self::Target {
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self.as_ref()
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}
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}
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impl AsRef<[u8]> for Chunk {
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#[inline]
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fn as_ref(&self) -> &[u8] {
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match self.0 {
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Inner::Mut(ref slice) => slice,
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Inner::Shared(ref slice) => slice,
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Inner::Swapping => unreachable!(),
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}
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}
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}
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impl fmt::Debug for Chunk {
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#[inline]
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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fmt::Debug::fmt(self.as_ref(), f)
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}
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}
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impl Default for Chunk {
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#[inline]
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fn default() -> Chunk {
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Chunk(Inner::Shared(Bytes::new()))
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}
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}
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impl IntoIterator for Chunk {
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type Item = u8;
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type IntoIter = <Bytes as IntoIterator>::IntoIter;
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fn into_iter(self) -> Self::IntoIter {
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match self.0 {
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Inner::Mut(bytes) => bytes.freeze().into_iter(),
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Inner::Shared(bytes) => bytes.into_iter(),
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Inner::Swapping => unreachable!(),
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}
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}
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}
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impl Extend<u8> for Chunk {
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fn extend<T>(&mut self, iter: T) where T: IntoIterator<Item=u8> {
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let iter = iter.into_iter();
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self.0.as_bytes_mut(iter.size_hint().0).extend(iter);
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}
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}
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