mirror of
https://github.com/sile/hls_m3u8.git
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73 lines
1.7 KiB
Rust
73 lines
1.7 KiB
Rust
use std::fmt;
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use std::ops::Deref;
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use std::str::FromStr;
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use crate::Error;
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/// Hexadecimal sequence.
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///
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/// See: [4.2. Attribute Lists]
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///
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/// [4.2. Attribute Lists]: https://tools.ietf.org/html/rfc8216#section-4.2
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#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct HexadecimalSequence(Vec<u8>);
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impl HexadecimalSequence {
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/// Makes a new `HexadecimalSequence` instance.
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pub fn new<T: Into<Vec<u8>>>(v: T) -> Self {
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HexadecimalSequence(v.into())
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}
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/// Converts into the underlying byte sequence.
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pub fn into_bytes(self) -> Vec<u8> {
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self.0
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}
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}
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impl Deref for HexadecimalSequence {
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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 HexadecimalSequence {
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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 HexadecimalSequence {
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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 HexadecimalSequence {
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type Err = Error;
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fn from_str(input: &str) -> Result<Self, Self::Err> {
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if !(input.starts_with("0x") || input.starts_with("0X")) {
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return Err(Error::invalid_input());
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}
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if input.len() % 2 != 0 {
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return Err(Error::invalid_input());
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}
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let mut result = Vec::with_capacity(input.len() / 2 - 1);
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for c in input.as_bytes().chunks(2).skip(1) {
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let d = String::from_utf8(c.to_vec()).map_err(|e| Error::custom(e))?;
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let b = u8::from_str_radix(d.as_str(), 16)?;
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result.push(b);
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}
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Ok(HexadecimalSequence(result))
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}
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}
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