86 lines
2.2 KiB
Rust
86 lines
2.2 KiB
Rust
use bytes::Bytes;
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use std::{ops, str};
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#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
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pub(crate) struct ByteStr {
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// Invariant: bytes contains valid UTF-8
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bytes: Bytes,
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}
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impl ByteStr {
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#[inline]
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pub fn new() -> ByteStr {
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ByteStr {
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// Invariant: the empty slice is trivially valid UTF-8.
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bytes: Bytes::new(),
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}
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}
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#[inline]
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pub const fn from_static(val: &'static str) -> ByteStr {
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ByteStr {
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// Invariant: val is a str so contains vaid UTF-8.
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bytes: Bytes::from_static(val.as_bytes()),
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}
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}
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#[inline]
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/// ## Panics
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/// In a debug build this will panic if `bytes` is not valid UTF-8.
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///
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/// ## Safety
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/// `bytes` must contain valid UTF-8. In a release build it is undefined
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/// behaviour to call this with `bytes` that is not valid UTF-8.
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pub unsafe fn from_utf8_unchecked(bytes: Bytes) -> ByteStr {
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if cfg!(debug_assertions) {
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match str::from_utf8(&bytes) {
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Ok(_) => (),
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Err(err) => panic!(
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"ByteStr::from_utf8_unchecked() with invalid bytes; error = {}, bytes = {:?}",
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err, bytes
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),
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}
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}
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// Invariant: assumed by the safety requirements of this function.
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ByteStr { bytes: bytes }
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}
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}
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impl ops::Deref for ByteStr {
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type Target = str;
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#[inline]
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fn deref(&self) -> &str {
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let b: &[u8] = self.bytes.as_ref();
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// Safety: the invariant of `bytes` is that it contains valid UTF-8.
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unsafe { str::from_utf8_unchecked(b) }
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}
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}
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impl From<String> for ByteStr {
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#[inline]
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fn from(src: String) -> ByteStr {
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ByteStr {
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// Invariant: src is a String so contains valid UTF-8.
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bytes: Bytes::from(src),
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}
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}
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}
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impl<'a> From<&'a str> for ByteStr {
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#[inline]
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fn from(src: &'a str) -> ByteStr {
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ByteStr {
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// Invariant: src is a str so contains valid UTF-8.
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bytes: Bytes::copy_from_slice(src.as_bytes()),
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}
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}
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}
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impl From<ByteStr> for Bytes {
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fn from(src: ByteStr) -> Self {
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src.bytes
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}
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}
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