mirror of
https://github.com/tokio-rs/bytes.git
synced 2026-08-09 00:00:15 +02:00
Sean McArthurandGitHub
43ac8e5494
Bytes is a useful tool for managing multiple slices into the same region of memory, and the other things it used to have been removed to reduce complexity. The exact strategy for managing the multiple references is no longer hard-coded, but instead backing by a customizable vtable. - Removed ability to mutate the underlying memory from the `Bytes` type. - Removed the "inline" (SBO) mechanism in `Bytes`. The reduces a large amount of complexity, and improves performance when accessing the slice of bytes, since a branch is no longer needed to check if the data is inline. - Removed `Bytes` knowledge of `BytesMut` (`BytesMut` may grow that knowledge back at a future point.)
83 lines
2.4 KiB
Rust
83 lines
2.4 KiB
Rust
use alloc::string::String;
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use alloc::vec::Vec;
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use core::{cmp, fmt};
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use serde::{Serialize, Serializer, Deserialize, Deserializer, de};
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use super::{Bytes, BytesMut};
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macro_rules! serde_impl {
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($ty:ident, $visitor_ty:ident, $from_slice:ident, $from_vec:ident) => (
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impl Serialize for $ty {
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#[inline]
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where S: Serializer
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{
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serializer.serialize_bytes(&self)
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}
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}
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struct $visitor_ty;
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impl<'de> de::Visitor<'de> for $visitor_ty {
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type Value = $ty;
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fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
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formatter.write_str("byte array")
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}
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#[inline]
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fn visit_seq<V>(self, mut seq: V) -> Result<Self::Value, V::Error>
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where V: de::SeqAccess<'de>
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{
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let len = cmp::min(seq.size_hint().unwrap_or(0), 4096);
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let mut values: Vec<u8> = Vec::with_capacity(len);
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while let Some(value) = seq.next_element()? {
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values.push(value);
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}
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Ok($ty::$from_vec(values))
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}
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#[inline]
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fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
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where E: de::Error
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{
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Ok($ty::$from_slice(v))
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}
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#[inline]
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fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
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where E: de::Error
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{
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Ok($ty::$from_vec(v))
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}
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#[inline]
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fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
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where E: de::Error
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{
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Ok($ty::$from_slice(v.as_bytes()))
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}
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#[inline]
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fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
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where E: de::Error
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{
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Ok($ty::$from_vec(v.into_bytes()))
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}
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}
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impl<'de> Deserialize<'de> for $ty {
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#[inline]
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fn deserialize<D>(deserializer: D) -> Result<$ty, D::Error>
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where D: Deserializer<'de>
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{
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deserializer.deserialize_byte_buf($visitor_ty)
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}
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}
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);
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}
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serde_impl!(Bytes, BytesVisitor, copy_from_slice, from);
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serde_impl!(BytesMut, BytesMutVisitor, from, from_vec);
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