/*!
# CDTOC: CDDB
*/
use crate::Toc;
use std::{
fmt,
hash,
};
#[cfg_attr(feature = "docsrs", doc(cfg(feature = "cddb")))]
#[derive(Debug, Clone, Copy)]
/// # CDDB ID.
///
/// This struct holds a [CDDB](https://en.wikipedia.org/wiki/CDDB) ID.
///
/// Values of this type are returned by [`Toc::cddb_id`].
///
/// ## Examples
///
/// ```
/// use cdtoc::Toc;
///
/// let toc = Toc::from_cdtoc("4+96+2D2B+6256+B327+D84A").unwrap();
/// let cddb_id = toc.cddb_id();
///
/// // Usually you'll want this value as a string:
/// assert_eq!(
/// cddb_id.to_string(),
/// "1f02e004",
/// );
///
/// // But you can also get it as a `u32`:
/// assert_eq!(
/// u32::from(cddb_id),
/// 520_282_116,
/// );
/// ```
pub struct Cddb(pub(crate) u32);
impl Eq for Cddb {}
impl fmt::Display for Cddb {
#[cfg(feature = "faster-hex")]
#[allow(unsafe_code)]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut buf = [b'0'; 8];
faster_hex::hex_encode(self.0.to_be_bytes().as_slice(), &mut buf).unwrap();
// Safety: all bytes are ASCII.
f.write_str(unsafe { std::str::from_utf8_unchecked(&buf) })
}
#[cfg(not(feature = "faster-hex"))]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:08x}", self.0)
}
}
impl hash::Hash for Cddb {
fn hash<H: hash::Hasher>(&self, state: &mut H) { state.write_u32(self.0); }
}
impl PartialEq for Cddb {
fn eq(&self, other: &Self) -> bool { self.0 == other.0 }
}
impl From<Cddb> for u32 {
#[inline]
fn from(src: Cddb) -> Self { src.0 }
}
impl From<&Toc> for Cddb {
#[allow(clippy::cast_possible_truncation)]
fn from(src: &Toc) -> Self {
let mut len = src.audio_len();
let mut a: u32 = 0;
// Add the audio positions.
let mut buf = itoa::Buffer::new();
for v in src.audio_sectors() {
for b in buf.format(v.wrapping_div(75)).bytes() {
a += u32::from(b ^ b'0');
}
}
// Add the data position.
if let Some(v) = src.data_sector() {
len += 1;
for b in buf.format(v.wrapping_div(75)).bytes() {
a += u32::from(b ^ b'0');
}
}
// The three parts we need.
let a = (a % 255) as u8;
let b = ((src.leadout().wrapping_div(75) - src.leadin().wrapping_div(75)) as u16).to_be_bytes();
let c = len as u8;
// Shove it into a single u32.
Self(u32::from_be_bytes([
a,
b[0], b[1],
c,
]))
}
}
impl Toc {
#[cfg_attr(feature = "docsrs", doc(cfg(feature = "cddb")))]
#[must_use]
/// # CDDB ID.
///
/// This returns the [CDDB](https://en.wikipedia.org/wiki/CDDB) ID
/// corresponding to the table of contents.
///
/// ## Examples
///
/// ```
/// use cdtoc::Toc;
///
/// let toc = Toc::from_cdtoc("4+96+2D2B+6256+B327+D84A").unwrap();
/// let cddb_id = toc.cddb_id();
///
/// // Usually you'll want this value as a string:
/// assert_eq!(
/// cddb_id.to_string(),
/// "1f02e004",
/// );
///
/// // But you can also get it as a `u32`:
/// assert_eq!(
/// u32::from(cddb_id),
/// 520_282_116,
/// );
/// ```
pub fn cddb_id(&self) -> Cddb { Cddb::from(self) }
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn t_cddb() {
for (t, c) in [
(
"D+96+3B5D+78E3+B441+EC83+134F4+17225+1A801+1EA5C+23B5B+27CEF+2B58B+2F974+35D56+514C8",
"b611560e",
),
(
"4+96+2D2B+6256+B327+D84A",
"1f02e004",
),
(
"10+B6+5352+62AC+99D6+E218+12AC0+135E7+142E9+178B0+19D22+1B0D0+1E7FA+22882+247DB+27074+2A1BD+2C0FB",
"d6096410",
),
(
"15+247E+2BEC+4AF4+7368+9704+B794+E271+110D0+12B7A+145C1+16CAF+195CF+1B40F+1F04A+21380+2362D+2589D+2793D+2A760+2DA32+300E1+32B46",
"100a5515",
),
(
"63+96+12D9+5546+A8A2+CAAA+128BF+17194+171DF+1722A+17275+172C0+1730B+17356+173A1+173EC+17437+17482+174CD+17518+17563+175AE+175F9+17644+1768F+176DA+17725+17770+177BB+17806+17851+1789C+178E7+17932+1797D+179C8+17A13+17A5E+17AA9+17AF4+17B3F+17B8A+17BD5+17C20+17C6B+17CB6+17D01+17D4C+17D97+17DE2+17E2D+17E78+17EC3+17F0E+17F59+17FA4+17FEF+1803A+18085+180D0+1811B+18166+181B1+181FC+18247+18292+182DD+18328+18373+183BE+18409+18454+1849F+184EA+18535+18580+185CB+18616+18661+186AC+186F7+18742+1878D+187D8+18823+1886E+188B9+18904+1894F+1899A+189E5+18A30+18A7B+18AC6+18B11+18B5C+18BA7+18BF2+18C38+1ECDC+246E9",
"cc07c363",
),
] {
let toc = Toc::from_cdtoc(t).expect("Invalid TOC");
assert_eq!(toc.cddb_id().to_string(), c);
}
}
}