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.gitignore
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/target
**/*.rs.bk
Cargo.lock
Cargo.toml
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[package]
name = "heapless-bytes"
version = "0.1.0-unreleased"
authors = ["Nicolas Stalder <n@stalder.io>"]
license = "Apache-2.0 OR MIT"
description = "Newtype around heapless byte Vec with efficient serde."
categories = ["embedded", "encoding", "no-std"]
keywords = ["serde", "cbor", "rust", "no-std"]
repository = "https://github.com/ycrypto/heapless-bytes"
readme = "README.md"
edition = "2018"
[dependencies.heapless]
version = "0.5.1"
default-features = false
[dependencies.serde]
version = "1.0"
default-features = false
[dependencies.serde_cbor]
version = "0.11.0"
default-features = false
optional = true
[features]
cbor = ["serde_cbor"]
LICENSE-APACHE
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LICENSE-MIT
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Copyright (c) 2019 Nicolas Stalder
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README.md
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## heapless-bytes
[![crates.io][crates-image]][crates-link]
[![Documentation][docs-image]][docs-link]
Newtype around heapless byte Vec with efficient serde.
[crates-image]: https://img.shields.io/crates/v/heapless-bytes.svg?style=flat-square
[crates-link]: https://crates.io/crates/heapless-bytes
[docs-image]: https://img.shields.io/badge/docs.rs-api-green?style=flat-square
[docs-link]: https://docs.rs/heapless-bytes
#### License
<sup>`heapless-bytes` is licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or [MIT License](LICENSE-MIT) at your option.</sup>
<br>
<sub>Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.</sub>
src/lib.rs
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//! # heapless-bytes
//!
//! Newtype around heapless byte Vec with efficient serde.
#![no_std]
use core::{
cmp::Ordering,
fmt::{self, Debug},
hash::{Hash, Hasher},
marker::PhantomData,
ops::{Deref, DerefMut},
};
pub use heapless::consts;
pub use heapless::ArrayLength;
use heapless::Vec;
use serde::{
de::{Deserialize, Deserializer, Error as _, SeqAccess, Visitor},
ser::{Serialize, Serializer},
};
#[derive(Clone, Default, Eq)]
pub struct Bytes<N: ArrayLength<u8>> {
bytes: Vec<u8, N>,
}
impl<N: ArrayLength<u8>> Bytes<N> {
/// Construct a new, empty `Bytes<N>`.
pub fn new() -> Self {
Bytes::from(Vec::new())
}
// /// Construct a new, empty `Bytes<N>` with the specified capacity.
// pub fn with_capacity(cap: usize) -> Self {
// Bytes<N>::from(Vec::with_capacity(cap))
// }
/// Wrap existing bytes in a `Bytes<N>`.
pub fn from<T: Into<Vec<u8, N>>>(bytes: T) -> Self {
Bytes {
bytes: bytes.into(),
}
}
/// Unwrap the vector of byte underlying this `Bytes<N>`.
pub fn into_vec(self) -> Vec<u8, N> {
self.bytes
}
// #[doc(hidden)]
// pub fn into_iter(self) -> <Vec<u8, N> as IntoIterator>::IntoIter {
// self.bytes.into_iter()
// }
pub fn try_from_slice(slice: &[u8]) -> core::result::Result<Self, ()> {
let mut bytes = Vec::<u8, N>::new();
bytes.extend_from_slice(slice)?;
Ok(Self::from(bytes))
}
// cf. https://internals.rust-lang.org/t/add-vec-insert-slice-at-to-insert-the-content-of-a-slice-at-an-arbitrary-index/11008/3
pub fn insert_slice_at(&mut self, slice: &[u8], at: usize) -> core::result::Result<(), ()> {
let l = slice.len();
let before = self.len();
// make space
self.bytes.resize_default(before + l)?;
// move back existing
let raw: &mut [u8] = &mut self.bytes;
raw.copy_within(at..before, at + l);
// insert slice
raw[at..][..l].copy_from_slice(slice);
Ok(())
}
// pub fn deref_mut(&mut self) -> &mut [u8] {
// self.bytes.deref_mut()
// }
#[cfg(feature = "cbor")]
pub fn from_serialized<T>(t: &T) -> Self
where
T: Serialize,
{
let mut vec = Vec::<u8, N>::new();
vec.resize_default(N::to_usize()).unwrap();
let buffer = vec.deref_mut();
let writer = serde_cbor::ser::SliceWrite::new(buffer);
let mut ser = serde_cbor::Serializer::new(writer)
.packed_format()
// .pack_starting_with(1)
// .pack_to_depth(1)
;
t.serialize(&mut ser).unwrap();
let writer = ser.into_inner();
let size = writer.bytes_written();
vec.resize_default(size).unwrap();
Self::from(vec)
}
}
impl<N: ArrayLength<u8>> Debug for Bytes<N> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// TODO: There has to be a better way :'-)
use core::ascii::escape_default;
f.write_str("b'")?;
for byte in &self.bytes {
for ch in escape_default(*byte) {
// Debug::fmt(unsafe { core::str::from_utf8_unchecked(&[ch]) }, f)?;
f.write_str(unsafe { core::str::from_utf8_unchecked(&[ch]) })?;
// f.write(&ch);
}
}
f.write_str("'")?;
Ok(())
}
}
impl<N: ArrayLength<u8>> AsRef<[u8]> for Bytes<N> {
fn as_ref(&self) -> &[u8] {
&self.bytes
}
}
impl<N: ArrayLength<u8>> AsMut<[u8]> for Bytes<N> {
fn as_mut(&mut self) -> &mut [u8] {
&mut self.bytes
}
}
impl<N: ArrayLength<u8>> Deref for Bytes<N> {
type Target = Vec<u8, N>;
fn deref(&self) -> &Self::Target {
&self.bytes
}
}
impl<N: ArrayLength<u8>> DerefMut for Bytes<N> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.bytes
}
}
// impl Borrow<Bytes> for Bytes<N> {
// fn borrow(&self) -> &Bytes {
// Bytes::new(&self.bytes)
// }
// }
// impl BorrowMut<Bytes> for Bytes<N> {
// fn borrow_mut(&mut self) -> &mut Bytes {
// unsafe { &mut *(&mut self.bytes as &mut [u8] as *mut [u8] as *mut Bytes) }
// }
// }
impl<N: ArrayLength<u8>, Rhs> PartialEq<Rhs> for Bytes<N>
where
Rhs: ?Sized + AsRef<[u8]>,
{
fn eq(&self, other: &Rhs) -> bool {
self.as_ref().eq(other.as_ref())
}
}
impl<N: ArrayLength<u8>, Rhs> PartialOrd<Rhs> for Bytes<N>
where
Rhs: ?Sized + AsRef<[u8]>,
{
fn partial_cmp(&self, other: &Rhs) -> Option<Ordering> {
self.as_ref().partial_cmp(other.as_ref())
}
}
impl<N: ArrayLength<u8>> Hash for Bytes<N> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.bytes.hash(state);
}
}
impl<N: ArrayLength<u8>> IntoIterator for Bytes<N> {
type Item = u8;
type IntoIter = <Vec<u8, N> as IntoIterator>::IntoIter;
fn into_iter(self) -> Self::IntoIter {
self.bytes.into_iter()
}
}
impl<'a, N: ArrayLength<u8>> IntoIterator for &'a Bytes<N> {
type Item = &'a u8;
type IntoIter = <&'a [u8] as IntoIterator>::IntoIter;
fn into_iter(self) -> Self::IntoIter {
self.bytes.iter()
}
}
impl<'a, N: ArrayLength<u8>> IntoIterator for &'a mut Bytes<N> {
type Item = &'a mut u8;
type IntoIter = <&'a mut [u8] as IntoIterator>::IntoIter;
fn into_iter(self) -> Self::IntoIter {
self.bytes.iter_mut()
}
}
impl<N> Serialize for Bytes<N>
where
N: ArrayLength<u8>,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_bytes(self)
}
}
// TODO: can we delegate to Vec<u8, N> deserialization instead of reimplementing?
impl<'de, N> Deserialize<'de> for Bytes<N>
where
N: ArrayLength<u8>,
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct ValueVisitor<'de, N>(PhantomData<(&'de (), N)>);
impl<'de, N> Visitor<'de> for ValueVisitor<'de, N>
where
N: ArrayLength<u8>,
{
// type Value = Vec<T, N>;
type Value = Bytes<N>;
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
formatter.write_str("a sequence")
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
let mut values: Vec<u8, N> = Vec::new();
// hprintln!("made a values: {:?} of capacity {:?}",
// &values, N::to_usize()).ok();
while let Some(value) = seq.next_element()? {
if values.push(value).is_err() {
// hprintln!("error! {}", values.capacity() + 1).ok();
// hprintln!("pushing value {:?} errored", &value).ok();
return Err(A::Error::invalid_length(values.capacity() + 1, &self))?;
}
}
Ok(Bytes::from(values))
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: serde::de::Error,
{
if v.len() > N::to_usize() {
// hprintln!("error! own size: {}, data size: {}", N::to_usize(), v.len()).ok();
// return Err(E::invalid_length(values.capacity() + 1, &self))?;
return Err(E::invalid_length(v.len(), &self))?;
}
let mut buf: Vec<u8, N> = Vec::new();
// avoid unwrapping even though redundant
match buf.extend_from_slice(v) {
Ok(()) => {}
Err(()) => {
// hprintln!("error! own size: {}, data size: {}", N::to_usize(), v.len()).ok();
// return Err(E::invalid_length(values.capacity() + 1, &self))?;
return Err(E::invalid_length(v.len(), &self))?;
}
}
Ok(Bytes::<N>::from(buf))
}
}
deserializer.deserialize_seq(ValueVisitor(PhantomData))
}
}
#[cfg(test)]
#[cfg(feature = "cbor")]
mod tests {
use super::*;
use heapless::consts;
#[test]
fn test_client_data_hash() {
let mut minimal = [
0x50u8, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x41, 0x42, 0x43,
0x44, 0x45, 0x46,
];
let client_data_hash: Bytes<consts::U32> =
serde_cbor::de::from_mut_slice(&mut minimal).unwrap();
assert_eq!(client_data_hash, b"1234567890ABCDEF");
}
}