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|
//! Common handling for types backed by byte allocation with enforcement of a
//! library-level length limitation i.e. `Length::max()`.
use crate::{
referenced::OwnedToRef, BytesRef, DecodeValue, DerOrd, EncodeValue, Error, Header, Length,
Reader, Result, StrRef, Writer,
};
use alloc::{boxed::Box, vec::Vec};
use core::cmp::Ordering;
/// Byte slice newtype which respects the `Length::max()` limit.
#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
pub(crate) struct BytesOwned {
/// Precomputed `Length` (avoids possible panicking conversions)
length: Length,
/// Inner value
inner: Box<[u8]>,
}
impl BytesOwned {
/// Create a new [`BytesOwned`], ensuring that the provided `slice` value
/// is shorter than `Length::max()`.
pub fn new(data: impl Into<Box<[u8]>>) -> Result<Self> {
let inner: Box<[u8]> = data.into();
Ok(Self {
length: Length::try_from(inner.len())?,
inner,
})
}
/// Borrow the inner byte slice
pub fn as_slice(&self) -> &[u8] {
&self.inner
}
/// Get the [`Length`] of this [`BytesRef`]
pub fn len(&self) -> Length {
self.length
}
/// Is this [`BytesOwned`] empty?
pub fn is_empty(&self) -> bool {
self.len() == Length::ZERO
}
}
impl AsRef<[u8]> for BytesOwned {
fn as_ref(&self) -> &[u8] {
self.as_slice()
}
}
impl<'a> DecodeValue<'a> for BytesOwned {
fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
reader.read_vec(header.length).and_then(Self::new)
}
}
impl EncodeValue for BytesOwned {
fn value_len(&self) -> Result<Length> {
Ok(self.length)
}
fn encode_value(&self, writer: &mut impl Writer) -> Result<()> {
writer.write(self.as_ref())
}
}
impl Default for BytesOwned {
fn default() -> Self {
Self {
length: Length::ZERO,
inner: Box::new([]),
}
}
}
impl DerOrd for BytesOwned {
fn der_cmp(&self, other: &Self) -> Result<Ordering> {
Ok(self.as_slice().cmp(other.as_slice()))
}
}
impl From<BytesOwned> for Box<[u8]> {
fn from(bytes: BytesOwned) -> Box<[u8]> {
bytes.inner
}
}
impl From<StrRef<'_>> for BytesOwned {
fn from(s: StrRef<'_>) -> BytesOwned {
let bytes = s.as_bytes();
debug_assert_eq!(bytes.len(), usize::try_from(s.length).expect("overflow"));
BytesOwned {
inner: Box::from(bytes),
length: s.length,
}
}
}
impl OwnedToRef for BytesOwned {
type Borrowed<'a> = BytesRef<'a>;
fn owned_to_ref(&self) -> Self::Borrowed<'_> {
BytesRef {
length: self.length,
inner: self.inner.as_ref(),
}
}
}
impl From<BytesRef<'_>> for BytesOwned {
fn from(s: BytesRef<'_>) -> BytesOwned {
BytesOwned {
length: s.length,
inner: Box::from(s.inner),
}
}
}
impl TryFrom<&[u8]> for BytesOwned {
type Error = Error;
fn try_from(bytes: &[u8]) -> Result<Self> {
Self::new(bytes)
}
}
impl TryFrom<Box<[u8]>> for BytesOwned {
type Error = Error;
fn try_from(bytes: Box<[u8]>) -> Result<Self> {
Self::new(bytes)
}
}
impl TryFrom<Vec<u8>> for BytesOwned {
type Error = Error;
fn try_from(bytes: Vec<u8>) -> Result<Self> {
Self::new(bytes)
}
}
// Implement by hand because the derive would create invalid values.
// Make sure the length and the inner.len matches.
#[cfg(feature = "arbitrary")]
impl<'a> arbitrary::Arbitrary<'a> for BytesOwned {
fn arbitrary(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
let length = u.arbitrary()?;
Ok(Self {
length,
inner: Box::from(u.bytes(u32::from(length) as usize)?),
})
}
fn size_hint(depth: usize) -> (usize, Option<usize>) {
arbitrary::size_hint::and(Length::size_hint(depth), (0, None))
}
}
|
