mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-09-27 14:10:05 +00:00
56 lines
1.5 KiB
Rust
56 lines
1.5 KiB
Rust
use crate::{Error, ErrorKind, Result};
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use std::fmt;
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use std::ops::Deref;
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use std::str::{self, FromStr};
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use trackable::error::ErrorKindExt;
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/// Initialization vector.
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///
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/// See: [4.3.2.4. EXT-X-KEY]
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///
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/// [4.3.2.4. EXT-X-KEY]: https://tools.ietf.org/html/rfc8216#section-4.3.2.4
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct InitializationVector(pub [u8; 16]);
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impl Deref for InitializationVector {
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type Target = [u8];
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl AsRef<[u8]> for InitializationVector {
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fn as_ref(&self) -> &[u8] {
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&self.0
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}
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}
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impl fmt::Display for InitializationVector {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "0x")?;
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for b in &self.0 {
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write!(f, "{:02x}", b)?;
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}
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Ok(())
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}
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}
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impl FromStr for InitializationVector {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self> {
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track_assert!(
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s.starts_with("0x") || s.starts_with("0X"),
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ErrorKind::InvalidInput
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);
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track_assert_eq!(s.len() - 2, 32, ErrorKind::InvalidInput);
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let mut v = [0; 16];
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for (i, c) in s.as_bytes().chunks(2).skip(1).enumerate() {
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let d = track!(str::from_utf8(c).map_err(|e| ErrorKind::InvalidInput.cause(e)))?;
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let b =
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track!(u8::from_str_radix(d, 16).map_err(|e| ErrorKind::InvalidInput.cause(e)))?;
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v[i] = b;
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}
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Ok(InitializationVector(v))
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}
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}
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