Import serde_bytes 0.11.9upstream/0.11.9upstream

16 files changed, 1479 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..555ba05
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "c3c83935d3943224c17ab11a7796db8e2810b7dc"
+  },
+  "path_in_vcs": ""
+}
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..66b119c
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule: [cron: "40 1 * * *"]
+
+permissions:
+  contents: read
+
+env:
+  RUSTFLAGS: -Dwarnings
+
+jobs:
+  test:
+    name: Rust ${{matrix.rust}}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [nightly, beta, stable, 1.36.0, 1.34.0, 1.31.0]
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{matrix.rust}}
+      - run: cargo test
+        if: matrix.rust != '1.31.0' && matrix.rust != '1.34.0'
+      - run: cargo check --no-default-features
+      - run: cargo check --no-default-features --features alloc
+        if: matrix.rust != '1.31.0' && matrix.rust != '1.34.0'
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request'
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@clippy
+      - run: cargo clippy --tests -- -Dclippy::all -Dclippy::pedantic
+
+  outdated:
+    name: Outdated
+    runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request'
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/install@cargo-outdated
+      - run: cargo outdated --workspace --exit-code 1
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4308d82
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+target/
+**/*.rs.bk
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2e75f8a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,56 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.31"
+name = "serde_bytes"
+version = "0.11.9"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+description = "Optimized handling of `&[u8]` and `Vec<u8>` for Serde"
+documentation = "https://docs.rs/serde_bytes"
+readme = "README.md"
+keywords = [
+    "serde",
+    "serialization",
+    "no_std",
+    "bytes",
+]
+categories = [
+    "encoding",
+    "no-std",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/serde-rs/bytes"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[lib]
+doc-scrape-examples = false
+
+[dependencies.serde]
+version = "1.0"
+default-features = false
+
+[dev-dependencies.bincode]
+version = "1.0"
+
+[dev-dependencies.serde_derive]
+version = "1.0"
+
+[dev-dependencies.serde_test]
+version = "1.0"
+
+[features]
+alloc = ["serde/alloc"]
+default = ["std"]
+std = ["serde/std"]
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..241a337
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,31 @@
+[package]
+name = "serde_bytes"
+version = "0.11.9" # remember to update html_root_url
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+categories = ["encoding", "no-std"]
+description = "Optimized handling of `&[u8]` and `Vec<u8>` for Serde"
+documentation = "https://docs.rs/serde_bytes"
+edition = "2018"
+keywords = ["serde", "serialization", "no_std", "bytes"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/serde-rs/bytes"
+rust-version = "1.31"
+
+[features]
+default = ["std"]
+std = ["serde/std"]
+alloc = ["serde/alloc"]
+
+[dependencies]
+serde = { version = "1.0", default-features = false }
+
+[dev-dependencies]
+bincode = "1.0"
+serde_derive = "1.0"
+serde_test = "1.0"
+
+[lib]
+doc-scrape-examples = false
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..1b5ec8b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,176 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
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+   and distribution as defined by Sections 1 through 9 of this document.
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+   (a) You must give any other recipients of the Work or
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+       of the NOTICE file are for informational purposes only and
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+       notices within Derivative Works that You distribute, alongside
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+
+   You may add Your own copyright statement to Your modifications and
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+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
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+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
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+   Work (including but not limited to damages for loss of goodwill,
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+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..31aa793
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e0a0e9f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,54 @@
+# serde\_bytes [![Build Status](https://img.shields.io/github/actions/workflow/status/serde-rs/bytes/ci.yml?branch=master)](https://github.com/serde-rs/bytes/actions?query=branch%3Amaster) [![Latest Version](https://img.shields.io/crates/v/serde_bytes.svg)](https://crates.io/crates/serde_bytes)
+
+Wrapper types to enable optimized handling of `&[u8]` and `Vec<u8>`.
+
+```toml
+[dependencies]
+serde_bytes = "0.11"
+```
+
+## Explanation
+
+Without specialization, Rust forces Serde to treat `&[u8]` just like any
+other slice and `Vec<u8>` just like any other vector. In reality this
+particular slice and vector can often be serialized and deserialized in a
+more efficient, compact representation in many formats.
+
+When working with such a format, you can opt into specialized handling of
+`&[u8]` by wrapping it in `serde_bytes::Bytes` and `Vec<u8>` by wrapping it
+in `serde_bytes::ByteBuf`.
+
+Additionally this crate supports the Serde `with` attribute to enable efficient
+handling of `&[u8]` and `Vec<u8>` in structs without needing a wrapper type.
+
+## Example
+
+```rust
+use serde::{Deserialize, Serialize};
+
+#[derive(Deserialize, Serialize)]
+struct Efficient<'a> {
+    #[serde(with = "serde_bytes")]
+    bytes: &'a [u8],
+
+    #[serde(with = "serde_bytes")]
+    byte_buf: Vec<u8>,
+}
+```
+
+<br>
+
+#### License
+
+<sup>
+Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
+2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
+</sup>
+
+<br>
+
+<sub>
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
+</sub>
diff --git a/src/bytebuf.rs b/src/bytebuf.rs
new file mode 100644
index 0000000..0c2daa6
--- /dev/null
+++ b/src/bytebuf.rs
@@ -0,0 +1,253 @@
+use core::borrow::{Borrow, BorrowMut};
+use core::cmp::{self, Ordering};
+use core::fmt::{self, Debug};
+use core::hash::{Hash, Hasher};
+use core::ops::{Deref, DerefMut};
+
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+#[cfg(feature = "alloc")]
+use alloc::string::String;
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+
+use serde::de::{Deserialize, Deserializer, Error, SeqAccess, Visitor};
+use serde::ser::{Serialize, Serializer};
+
+use crate::Bytes;
+
+/// Wrapper around `Vec<u8>` to serialize and deserialize efficiently.
+///
+/// ```
+/// use std::collections::HashMap;
+/// use std::io;
+///
+/// use serde_bytes::ByteBuf;
+///
+/// fn deserialize_bytebufs() -> bincode::Result<()> {
+///     let example_data = [
+///         2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 116,
+///         119, 111, 1, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 111, 110, 101];
+///
+///     let map: HashMap<u32, ByteBuf> = bincode::deserialize(&example_data[..])?;
+///
+///     println!("{:?}", map);
+///
+///     Ok(())
+/// }
+/// #
+/// # fn main() {
+/// #     deserialize_bytebufs().unwrap();
+/// # }
+/// ```
+#[derive(Clone, Default, Eq, Ord)]
+pub struct ByteBuf {
+    bytes: Vec<u8>,
+}
+
+impl ByteBuf {
+    /// Construct a new, empty `ByteBuf`.
+    pub fn new() -> Self {
+        ByteBuf::from(Vec::new())
+    }
+
+    /// Construct a new, empty `ByteBuf` with the specified capacity.
+    pub fn with_capacity(cap: usize) -> Self {
+        ByteBuf::from(Vec::with_capacity(cap))
+    }
+
+    /// Wrap existing bytes in a `ByteBuf`.
+    pub fn from<T: Into<Vec<u8>>>(bytes: T) -> Self {
+        ByteBuf {
+            bytes: bytes.into(),
+        }
+    }
+
+    /// Unwrap the vector of byte underlying this `ByteBuf`.
+    pub fn into_vec(self) -> Vec<u8> {
+        self.bytes
+    }
+
+    #[allow(missing_docs)]
+    pub fn into_boxed_bytes(self) -> Box<Bytes> {
+        self.bytes.into_boxed_slice().into()
+    }
+
+    // This would hit "cannot move out of borrowed content" if invoked through
+    // the Deref impl; make it just work.
+    #[doc(hidden)]
+    pub fn into_boxed_slice(self) -> Box<[u8]> {
+        self.bytes.into_boxed_slice()
+    }
+
+    #[doc(hidden)]
+    #[allow(clippy::should_implement_trait)]
+    pub fn into_iter(self) -> <Vec<u8> as IntoIterator>::IntoIter {
+        self.bytes.into_iter()
+    }
+}
+
+impl Debug for ByteBuf {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        Debug::fmt(&self.bytes, f)
+    }
+}
+
+impl AsRef<[u8]> for ByteBuf {
+    fn as_ref(&self) -> &[u8] {
+        &self.bytes
+    }
+}
+
+impl AsMut<[u8]> for ByteBuf {
+    fn as_mut(&mut self) -> &mut [u8] {
+        &mut self.bytes
+    }
+}
+
+impl Deref for ByteBuf {
+    type Target = Vec<u8>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.bytes
+    }
+}
+
+impl DerefMut for ByteBuf {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.bytes
+    }
+}
+
+impl Borrow<Bytes> for ByteBuf {
+    fn borrow(&self) -> &Bytes {
+        Bytes::new(&self.bytes)
+    }
+}
+
+impl BorrowMut<Bytes> for ByteBuf {
+    fn borrow_mut(&mut self) -> &mut Bytes {
+        unsafe { &mut *(&mut self.bytes as &mut [u8] as *mut [u8] as *mut Bytes) }
+    }
+}
+
+impl<Rhs> PartialEq<Rhs> for ByteBuf
+where
+    Rhs: ?Sized + AsRef<[u8]>,
+{
+    fn eq(&self, other: &Rhs) -> bool {
+        self.as_ref().eq(other.as_ref())
+    }
+}
+
+impl<Rhs> PartialOrd<Rhs> for ByteBuf
+where
+    Rhs: ?Sized + AsRef<[u8]>,
+{
+    fn partial_cmp(&self, other: &Rhs) -> Option<Ordering> {
+        self.as_ref().partial_cmp(other.as_ref())
+    }
+}
+
+impl Hash for ByteBuf {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.bytes.hash(state);
+    }
+}
+
+impl IntoIterator for ByteBuf {
+    type Item = u8;
+    type IntoIter = <Vec<u8> as IntoIterator>::IntoIter;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.bytes.into_iter()
+    }
+}
+
+impl<'a> IntoIterator for &'a ByteBuf {
+    type Item = &'a u8;
+    type IntoIter = <&'a [u8] as IntoIterator>::IntoIter;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.bytes.iter()
+    }
+}
+
+impl<'a> IntoIterator for &'a mut ByteBuf {
+    type Item = &'a mut u8;
+    type IntoIter = <&'a mut [u8] as IntoIterator>::IntoIter;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.bytes.iter_mut()
+    }
+}
+
+impl Serialize for ByteBuf {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(&self.bytes)
+    }
+}
+
+struct ByteBufVisitor;
+
+impl<'de> Visitor<'de> for ByteBufVisitor {
+    type Value = ByteBuf;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("byte array")
+    }
+
+    fn visit_seq<V>(self, mut visitor: V) -> Result<ByteBuf, V::Error>
+    where
+        V: SeqAccess<'de>,
+    {
+        let len = cmp::min(visitor.size_hint().unwrap_or(0), 4096);
+        let mut bytes = Vec::with_capacity(len);
+
+        while let Some(b) = visitor.next_element()? {
+            bytes.push(b);
+        }
+
+        Ok(ByteBuf::from(bytes))
+    }
+
+    fn visit_bytes<E>(self, v: &[u8]) -> Result<ByteBuf, E>
+    where
+        E: Error,
+    {
+        Ok(ByteBuf::from(v))
+    }
+
+    fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<ByteBuf, E>
+    where
+        E: Error,
+    {
+        Ok(ByteBuf::from(v))
+    }
+
+    fn visit_str<E>(self, v: &str) -> Result<ByteBuf, E>
+    where
+        E: Error,
+    {
+        Ok(ByteBuf::from(v))
+    }
+
+    fn visit_string<E>(self, v: String) -> Result<ByteBuf, E>
+    where
+        E: Error,
+    {
+        Ok(ByteBuf::from(v))
+    }
+}
+
+impl<'de> Deserialize<'de> for ByteBuf {
+    fn deserialize<D>(deserializer: D) -> Result<ByteBuf, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_byte_buf(ByteBufVisitor)
+    }
+}
diff --git a/src/bytes.rs b/src/bytes.rs
new file mode 100644
index 0000000..ad0902b
--- /dev/null
+++ b/src/bytes.rs
@@ -0,0 +1,172 @@
+use core::cmp::Ordering;
+use core::fmt::{self, Debug};
+use core::hash::{Hash, Hasher};
+use core::ops::{Deref, DerefMut};
+
+#[cfg(feature = "alloc")]
+use alloc::borrow::ToOwned;
+
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use crate::ByteBuf;
+
+use serde::de::{Deserialize, Deserializer};
+use serde::ser::{Serialize, Serializer};
+
+/// Wrapper around `[u8]` to serialize and deserialize efficiently.
+///
+/// ```
+/// use std::collections::HashMap;
+/// use std::io;
+///
+/// use serde_bytes::Bytes;
+///
+/// fn print_encoded_cache() -> bincode::Result<()> {
+///     let mut cache = HashMap::new();
+///     cache.insert(3, Bytes::new(b"three"));
+///     cache.insert(2, Bytes::new(b"two"));
+///     cache.insert(1, Bytes::new(b"one"));
+///
+///     bincode::serialize_into(&mut io::stdout(), &cache)
+/// }
+/// #
+/// # fn main() {
+/// #     print_encoded_cache().unwrap();
+/// # }
+/// ```
+#[derive(Eq, Ord)]
+#[cfg_attr(not(doc), repr(transparent))]
+pub struct Bytes {
+    bytes: [u8],
+}
+
+impl Bytes {
+    /// Wrap an existing `&[u8]`.
+    pub fn new(bytes: &[u8]) -> &Self {
+        unsafe { &*(bytes as *const [u8] as *const Bytes) }
+    }
+}
+
+impl Debug for Bytes {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        Debug::fmt(&self.bytes, f)
+    }
+}
+
+impl AsRef<[u8]> for Bytes {
+    fn as_ref(&self) -> &[u8] {
+        &self.bytes
+    }
+}
+
+impl AsMut<[u8]> for Bytes {
+    fn as_mut(&mut self) -> &mut [u8] {
+        &mut self.bytes
+    }
+}
+
+impl Deref for Bytes {
+    type Target = [u8];
+
+    fn deref(&self) -> &Self::Target {
+        &self.bytes
+    }
+}
+
+impl DerefMut for Bytes {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.bytes
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl ToOwned for Bytes {
+    type Owned = ByteBuf;
+
+    fn to_owned(&self) -> Self::Owned {
+        ByteBuf::from(&self.bytes)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl From<Box<[u8]>> for Box<Bytes> {
+    fn from(bytes: Box<[u8]>) -> Self {
+        unsafe { Box::from_raw(Box::into_raw(bytes) as *mut Bytes) }
+    }
+}
+
+impl<'a> Default for &'a Bytes {
+    fn default() -> Self {
+        Bytes::new(&[])
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl Default for Box<Bytes> {
+    fn default() -> Self {
+        ByteBuf::new().into_boxed_bytes()
+    }
+}
+
+impl<Rhs> PartialEq<Rhs> for Bytes
+where
+    Rhs: ?Sized + AsRef<[u8]>,
+{
+    fn eq(&self, other: &Rhs) -> bool {
+        self.as_ref().eq(other.as_ref())
+    }
+}
+
+impl<Rhs> PartialOrd<Rhs> for Bytes
+where
+    Rhs: ?Sized + AsRef<[u8]>,
+{
+    fn partial_cmp(&self, other: &Rhs) -> Option<Ordering> {
+        self.as_ref().partial_cmp(other.as_ref())
+    }
+}
+
+impl Hash for Bytes {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.bytes.hash(state);
+    }
+}
+
+impl<'a> IntoIterator for &'a Bytes {
+    type Item = &'a u8;
+    type IntoIter = <&'a [u8] as IntoIterator>::IntoIter;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.bytes.iter()
+    }
+}
+
+impl<'a> IntoIterator for &'a mut Bytes {
+    type Item = &'a mut u8;
+    type IntoIter = <&'a mut [u8] as IntoIterator>::IntoIter;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.bytes.iter_mut()
+    }
+}
+
+impl Serialize for Bytes {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(&self.bytes)
+    }
+}
+
+impl<'a, 'de: 'a> Deserialize<'de> for &'a Bytes {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // serde::Deserialize for &[u8] is already optimized, so simply forward to that.
+        Deserialize::deserialize(deserializer).map(Bytes::new)
+    }
+}
diff --git a/src/de.rs b/src/de.rs
new file mode 100644
index 0000000..e4a4732
--- /dev/null
+++ b/src/de.rs
@@ -0,0 +1,229 @@
+use crate::Bytes;
+use core::fmt;
+use core::marker::PhantomData;
+use serde::de::{Error, Visitor};
+use serde::Deserializer;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use crate::ByteBuf;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use core::cmp;
+
+#[cfg(feature = "alloc")]
+use alloc::borrow::Cow;
+#[cfg(all(feature = "std", not(feature = "alloc")))]
+use std::borrow::Cow;
+
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+#[cfg(feature = "alloc")]
+use alloc::string::String;
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use serde::de::SeqAccess;
+
+/// Types that can be deserialized via `#[serde(with = "serde_bytes")]`.
+pub trait Deserialize<'de>: Sized {
+    #[allow(missing_docs)]
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>;
+}
+
+impl<'de: 'a, 'a> Deserialize<'de> for &'a [u8] {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // serde::Deserialize for &[u8] is already optimized, so simply forward to that.
+        serde::Deserialize::deserialize(deserializer)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de> Deserialize<'de> for Vec<u8> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Deserialize::deserialize(deserializer).map(ByteBuf::into_vec)
+    }
+}
+
+impl<'de: 'a, 'a> Deserialize<'de> for &'a Bytes {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // serde::Deserialize for &[u8] is already optimized, so simply forward to that.
+        serde::Deserialize::deserialize(deserializer).map(Bytes::new)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de> Deserialize<'de> for ByteBuf {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // Via the serde::Deserialize impl for ByteBuf.
+        serde::Deserialize::deserialize(deserializer)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, [u8]> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct CowVisitor;
+
+        impl<'de> Visitor<'de> for CowVisitor {
+            type Value = Cow<'de, [u8]>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("a byte array")
+            }
+
+            fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(v))
+            }
+
+            fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(v.as_bytes()))
+            }
+
+            fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.to_vec()))
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.as_bytes().to_vec()))
+            }
+
+            fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v))
+            }
+
+            fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.into_bytes()))
+            }
+
+            fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
+            where
+                V: SeqAccess<'de>,
+            {
+                let len = cmp::min(visitor.size_hint().unwrap_or(0), 4096);
+                let mut bytes = Vec::with_capacity(len);
+
+                while let Some(b) = visitor.next_element()? {
+                    bytes.push(b);
+                }
+
+                Ok(Cow::Owned(bytes))
+            }
+        }
+
+        deserializer.deserialize_bytes(CowVisitor)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, Bytes> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let cow: Cow<[u8]> = Deserialize::deserialize(deserializer)?;
+        match cow {
+            Cow::Borrowed(bytes) => Ok(Cow::Borrowed(Bytes::new(bytes))),
+            Cow::Owned(bytes) => Ok(Cow::Owned(ByteBuf::from(bytes))),
+        }
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de> Deserialize<'de> for Box<[u8]> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Deserialize::deserialize(deserializer).map(Vec::into_boxed_slice)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de> Deserialize<'de> for Box<Bytes> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let bytes: Box<[u8]> = Deserialize::deserialize(deserializer)?;
+        Ok(bytes.into())
+    }
+}
+
+impl<'de, T> Deserialize<'de> for Option<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct BytesVisitor<T> {
+            out: PhantomData<T>,
+        }
+
+        impl<'de, T> Visitor<'de> for BytesVisitor<T>
+        where
+            T: Deserialize<'de>,
+        {
+            type Value = Option<T>;
+
+            fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                f.write_str("optional byte array")
+            }
+
+            fn visit_unit<E: Error>(self) -> Result<Self::Value, E> {
+                Ok(None)
+            }
+
+            fn visit_none<E: Error>(self) -> Result<Self::Value, E> {
+                Ok(None)
+            }
+
+            fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                T::deserialize(deserializer).map(Some)
+            }
+        }
+
+        let visitor = BytesVisitor { out: PhantomData };
+        deserializer.deserialize_option(visitor)
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..871d6cb
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,113 @@
+//! Wrapper types to enable optimized handling of `&[u8]` and `Vec<u8>`.
+//!
+//! Without specialization, Rust forces Serde to treat `&[u8]` just like any
+//! other slice and `Vec<u8>` just like any other vector. In reality this
+//! particular slice and vector can often be serialized and deserialized in a
+//! more efficient, compact representation in many formats.
+//!
+//! When working with such a format, you can opt into specialized handling of
+//! `&[u8]` by wrapping it in `serde_bytes::Bytes` and `Vec<u8>` by wrapping it
+//! in `serde_bytes::ByteBuf`.
+//!
+//! Additionally this crate supports the Serde `with` attribute to enable
+//! efficient handling of `&[u8]` and `Vec<u8>` in structs without needing a
+//! wrapper type.
+//!
+//! ```
+//! # use serde_derive::{Deserialize, Serialize};
+//! use serde::{Deserialize, Serialize};
+//!
+//! #[derive(Deserialize, Serialize)]
+//! struct Efficient<'a> {
+//!     #[serde(with = "serde_bytes")]
+//!     bytes: &'a [u8],
+//!
+//!     #[serde(with = "serde_bytes")]
+//!     byte_buf: Vec<u8>,
+//! }
+//! ```
+
+#![doc(html_root_url = "https://docs.rs/serde_bytes/0.11.9")]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![deny(missing_docs)]
+#![allow(
+    clippy::missing_errors_doc,
+    clippy::must_use_candidate,
+    clippy::needless_doctest_main
+)]
+
+mod bytes;
+mod de;
+mod ser;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+mod bytebuf;
+
+#[cfg(feature = "alloc")]
+extern crate alloc;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use serde::Deserializer;
+
+use serde::Serializer;
+
+pub use crate::bytes::Bytes;
+pub use crate::de::Deserialize;
+pub use crate::ser::Serialize;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+pub use crate::bytebuf::ByteBuf;
+
+/// Serde `serialize_with` function to serialize bytes efficiently.
+///
+/// This function can be used with either of the following Serde attributes:
+///
+/// - `#[serde(with = "serde_bytes")]`
+/// - `#[serde(serialize_with = "serde_bytes::serialize")]`
+///
+/// ```
+/// # use serde_derive::Serialize;
+/// use serde::Serialize;
+///
+/// #[derive(Serialize)]
+/// struct Efficient<'a> {
+///     #[serde(with = "serde_bytes")]
+///     bytes: &'a [u8],
+///
+///     #[serde(with = "serde_bytes")]
+///     byte_buf: Vec<u8>,
+/// }
+/// ```
+pub fn serialize<T, S>(bytes: &T, serializer: S) -> Result<S::Ok, S::Error>
+where
+    T: ?Sized + Serialize,
+    S: Serializer,
+{
+    Serialize::serialize(bytes, serializer)
+}
+
+/// Serde `deserialize_with` function to deserialize bytes efficiently.
+///
+/// This function can be used with either of the following Serde attributes:
+///
+/// - `#[serde(with = "serde_bytes")]`
+/// - `#[serde(deserialize_with = "serde_bytes::deserialize")]`
+///
+/// ```
+/// # use serde_derive::Deserialize;
+/// use serde::Deserialize;
+///
+/// #[derive(Deserialize)]
+/// struct Packet {
+///     #[serde(with = "serde_bytes")]
+///     payload: Vec<u8>,
+/// }
+/// ```
+#[cfg(any(feature = "std", feature = "alloc"))]
+pub fn deserialize<'de, T, D>(deserializer: D) -> Result<T, D::Error>
+where
+    T: Deserialize<'de>,
+    D: Deserializer<'de>,
+{
+    Deserialize::deserialize(deserializer)
+}
diff --git a/src/ser.rs b/src/ser.rs
new file mode 100644
index 0000000..1cbed9f
--- /dev/null
+++ b/src/ser.rs
@@ -0,0 +1,136 @@
+use crate::Bytes;
+use serde::Serializer;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use crate::ByteBuf;
+
+#[cfg(feature = "alloc")]
+use alloc::borrow::Cow;
+#[cfg(all(feature = "std", not(feature = "alloc")))]
+use std::borrow::Cow;
+
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+
+/// Types that can be serialized via `#[serde(with = "serde_bytes")]`.
+pub trait Serialize {
+    #[allow(missing_docs)]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer;
+}
+
+impl Serialize for [u8] {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(self)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl Serialize for Vec<u8> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(self)
+    }
+}
+
+impl Serialize for Bytes {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(self)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl Serialize for ByteBuf {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(self)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'a> Serialize for Cow<'a, [u8]> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(self)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'a> Serialize for Cow<'a, Bytes> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(self)
+    }
+}
+
+impl<'a, T> Serialize for &'a T
+where
+    T: ?Sized + Serialize,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        (**self).serialize(serializer)
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<T> Serialize for Box<T>
+where
+    T: ?Sized + Serialize,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        (**self).serialize(serializer)
+    }
+}
+
+impl<T> Serialize for Option<T>
+where
+    T: Serialize,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        struct AsBytes<T>(T);
+
+        impl<T> serde::Serialize for AsBytes<T>
+        where
+            T: Serialize,
+        {
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                self.0.serialize(serializer)
+            }
+        }
+
+        match self {
+            Some(b) => serializer.serialize_some(&AsBytes(b)),
+            None => serializer.serialize_none(),
+        }
+    }
+}
diff --git a/tests/test_derive.rs b/tests/test_derive.rs
new file mode 100644
index 0000000..c7e97f1
--- /dev/null
+++ b/tests/test_derive.rs
@@ -0,0 +1,101 @@
+#![allow(clippy::derive_partial_eq_without_eq, clippy::ref_option_ref)]
+
+use serde_bytes::{ByteBuf, Bytes};
+use serde_derive::{Deserialize, Serialize};
+use serde_test::{assert_tokens, Token};
+use std::borrow::Cow;
+
+#[derive(Serialize, Deserialize, PartialEq, Debug)]
+struct Test<'a> {
+    #[serde(with = "serde_bytes")]
+    slice: &'a [u8],
+
+    #[serde(with = "serde_bytes")]
+    vec: Vec<u8>,
+
+    #[serde(with = "serde_bytes")]
+    bytes: &'a Bytes,
+
+    #[serde(with = "serde_bytes")]
+    byte_buf: ByteBuf,
+
+    #[serde(with = "serde_bytes")]
+    cow_slice: Cow<'a, [u8]>,
+
+    #[serde(with = "serde_bytes")]
+    cow_bytes: Cow<'a, Bytes>,
+
+    #[serde(with = "serde_bytes")]
+    boxed_slice: Box<[u8]>,
+
+    #[serde(with = "serde_bytes")]
+    boxed_bytes: Box<Bytes>,
+
+    #[serde(with = "serde_bytes")]
+    opt_slice: Option<&'a [u8]>,
+
+    #[serde(with = "serde_bytes")]
+    opt_vec: Option<Vec<u8>>,
+
+    #[serde(with = "serde_bytes")]
+    opt_cow_slice: Option<Cow<'a, [u8]>>,
+}
+
+#[derive(Serialize)]
+struct Dst {
+    #[serde(with = "serde_bytes")]
+    bytes: [u8],
+}
+
+#[test]
+fn test() {
+    let test = Test {
+        slice: b"...",
+        vec: b"...".to_vec(),
+        bytes: Bytes::new(b"..."),
+        byte_buf: ByteBuf::from(b"...".as_ref()),
+        cow_slice: Cow::Borrowed(b"..."),
+        cow_bytes: Cow::Borrowed(Bytes::new(b"...")),
+        boxed_slice: b"...".to_vec().into_boxed_slice(),
+        boxed_bytes: ByteBuf::from(b"...".as_ref()).into_boxed_bytes(),
+        opt_slice: Some(b"..."),
+        opt_vec: Some(b"...".to_vec()),
+        opt_cow_slice: Some(Cow::Borrowed(b"...")),
+    };
+
+    assert_tokens(
+        &test,
+        &[
+            Token::Struct {
+                name: "Test",
+                len: 11,
+            },
+            Token::Str("slice"),
+            Token::BorrowedBytes(b"..."),
+            Token::Str("vec"),
+            Token::Bytes(b"..."),
+            Token::Str("bytes"),
+            Token::BorrowedBytes(b"..."),
+            Token::Str("byte_buf"),
+            Token::Bytes(b"..."),
+            Token::Str("cow_slice"),
+            Token::BorrowedBytes(b"..."),
+            Token::Str("cow_bytes"),
+            Token::BorrowedBytes(b"..."),
+            Token::Str("boxed_slice"),
+            Token::Bytes(b"..."),
+            Token::Str("boxed_bytes"),
+            Token::Bytes(b"..."),
+            Token::Str("opt_slice"),
+            Token::Some,
+            Token::BorrowedBytes(b"..."),
+            Token::Str("opt_vec"),
+            Token::Some,
+            Token::Bytes(b"..."),
+            Token::Str("opt_cow_slice"),
+            Token::Some,
+            Token::BorrowedBytes(b"..."),
+            Token::StructEnd,
+        ],
+    );
+}
diff --git a/tests/test_partialeq.rs b/tests/test_partialeq.rs
new file mode 100644
index 0000000..a57d194
--- /dev/null
+++ b/tests/test_partialeq.rs
@@ -0,0 +1,15 @@
+#![allow(clippy::needless_pass_by_value)]
+
+use serde_bytes::{ByteBuf, Bytes};
+
+fn _bytes_eq_slice(bytes: &Bytes, slice: &[u8]) -> bool {
+    bytes == slice
+}
+
+fn _bytebuf_eq_vec(bytebuf: ByteBuf, vec: Vec<u8>) -> bool {
+    bytebuf == vec
+}
+
+fn _bytes_eq_bytestring(bytes: &Bytes) -> bool {
+    bytes == b"..."
+}
diff --git a/tests/test_serde.rs b/tests/test_serde.rs
new file mode 100644
index 0000000..d48e3fd
--- /dev/null
+++ b/tests/test_serde.rs
@@ -0,0 +1,59 @@
+use serde_bytes::{ByteBuf, Bytes};
+use serde_test::{assert_de_tokens, assert_ser_tokens, assert_tokens, Token};
+
+#[test]
+fn test_bytes() {
+    let empty = Bytes::new(&[]);
+    assert_tokens(&empty, &[Token::BorrowedBytes(b"")]);
+    assert_ser_tokens(&empty, &[Token::Bytes(b"")]);
+    assert_ser_tokens(&empty, &[Token::ByteBuf(b"")]);
+    assert_de_tokens(&empty, &[Token::BorrowedStr("")]);
+
+    let buf = vec![65, 66, 67];
+    let bytes = Bytes::new(&buf);
+    assert_tokens(&bytes, &[Token::BorrowedBytes(b"ABC")]);
+    assert_ser_tokens(&bytes, &[Token::Bytes(b"ABC")]);
+    assert_ser_tokens(&bytes, &[Token::ByteBuf(b"ABC")]);
+    assert_de_tokens(&bytes, &[Token::BorrowedStr("ABC")]);
+}
+
+#[test]
+fn test_byte_buf() {
+    let empty = ByteBuf::new();
+    assert_tokens(&empty, &[Token::BorrowedBytes(b"")]);
+    assert_tokens(&empty, &[Token::Bytes(b"")]);
+    assert_tokens(&empty, &[Token::ByteBuf(b"")]);
+    assert_de_tokens(&empty, &[Token::BorrowedStr("")]);
+    assert_de_tokens(&empty, &[Token::Str("")]);
+    assert_de_tokens(&empty, &[Token::String("")]);
+    assert_de_tokens(&empty, &[Token::Seq { len: None }, Token::SeqEnd]);
+    assert_de_tokens(&empty, &[Token::Seq { len: Some(0) }, Token::SeqEnd]);
+
+    let buf = ByteBuf::from(vec![65, 66, 67]);
+    assert_tokens(&buf, &[Token::BorrowedBytes(b"ABC")]);
+    assert_tokens(&buf, &[Token::Bytes(b"ABC")]);
+    assert_tokens(&buf, &[Token::ByteBuf(b"ABC")]);
+    assert_de_tokens(&buf, &[Token::BorrowedStr("ABC")]);
+    assert_de_tokens(&buf, &[Token::Str("ABC")]);
+    assert_de_tokens(&buf, &[Token::String("ABC")]);
+    assert_de_tokens(
+        &buf,
+        &[
+            Token::Seq { len: None },
+            Token::U8(65),
+            Token::U8(66),
+            Token::U8(67),
+            Token::SeqEnd,
+        ],
+    );
+    assert_de_tokens(
+        &buf,
+        &[
+            Token::Seq { len: Some(3) },
+            Token::U8(65),
+            Token::U8(66),
+            Token::U8(67),
+            Token::SeqEnd,
+        ],
+    );
+}