192 lines
5.1 KiB
Rust
192 lines
5.1 KiB
Rust
//! NRG DAOX chunk data structure and associated functions.
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use std::fmt;
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use std::fs::File;
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use ::error::NrgError;
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use super::readers::*;
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#[derive(Debug)]
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pub struct NrgDaox {
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pub size: u32,
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pub size2: u32,
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pub upc: String,
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pub padding: u8,
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pub toc_type: u16,
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pub first_track: u8,
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pub last_track: u8,
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pub tracks: Vec<NrgDaoxTrack>,
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}
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impl NrgDaox {
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pub fn new() -> NrgDaox {
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NrgDaox {
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size: 0,
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size2: 0,
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upc: String::new(),
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padding: 0,
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toc_type: 0,
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first_track: 0,
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last_track: 0,
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tracks: Vec::new(),
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}
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}
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}
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impl fmt::Display for NrgDaox {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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try!(writeln!(f, "Chunk ID: DAOX\n\
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Chunk description: DAO (Disc At Once) Information\n\
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Chunk size: {} Bytes\n\
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Chunk size 2: {}\n\
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UPC: \"{}\"",
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self.size,
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self.size2,
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self.upc));
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if self.padding != 0 {
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try!(writeln!(f, "Padding: {} (Warning: should be 0!)",
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self.padding));
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}
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try!(write!(f, "TOC type: 0x{:04X}\n\
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First track in the session: {}\n\
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Last track in the session: {}",
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self.toc_type,
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self.first_track,
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self.last_track));
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if self.tracks.is_empty() {
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try!(write!(f, "\nNo DAOX tracks!"));
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} else {
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let mut i = 1;
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for track in &self.tracks {
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try!(write!(f, "\n\
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Track {:02}:\n\
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{}", i, track));
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i += 1;
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}
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}
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Ok(())
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}
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}
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#[derive(Debug)]
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pub struct NrgDaoxTrack {
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pub isrc: String,
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pub sector_size: u16,
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pub data_mode: u16,
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pub unknown: u16,
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pub index0: u64,
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pub index1: u64,
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pub track_end: u64,
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}
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impl NrgDaoxTrack {
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pub fn new() -> NrgDaoxTrack {
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NrgDaoxTrack {
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isrc: String::new(),
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sector_size: 0,
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data_mode: 0,
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unknown: 0,
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index0: 0,
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index1: 0,
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track_end: 0,
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}
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}
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}
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impl fmt::Display for NrgDaoxTrack {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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try!(writeln!(f, "\tISRC: \"{}\"\n\
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\tSector size in the image file: {} Bytes\n\
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\tMode of the data in the image file: 0x{:04X}",
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self.isrc,
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self.sector_size,
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self.data_mode));
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if self.unknown != 0x0001 {
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try!(writeln!(f, "\tUnknown field: 0x{:04X} \
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(Warning: should be 0x0001!)",
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self.unknown));
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}
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write!(f, "\tIndex0 (Pre-gap): {} Bytes\n\
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\tIndex1 (Start of track): {} Bytes\n\
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\tEnd of track + 1: {} Bytes",
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self.index0,
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self.index1,
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self.track_end)
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}
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}
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/// Reads the NRG Disc-At-Once Information chunk (DAOX).
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///
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/// The DAOX is constituted of the following data:
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///
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/// - 4 B: Chunk size (in bytes)
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/// - 4 B: Chunk size again, sometimes little endian
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/// - 13 B: UPC (text) or null bytes
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/// - 1 B: Unknown (padding?), always 0
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/// - 2 B: TOC type
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/// - 1 B: First track in the session
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/// - 1 B: Last track in the session
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///
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/// Followed by one or more groups of 42-byte blocks composed of:
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/// - 12 B: ISRC (text) or null bytes
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/// - 2 B: Sector size in the image file (bytes)
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/// - 2 B: Mode of the data in the image file
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/// - 2 B: Unknown (should always be 0x0001)
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/// - 8 B: Index0 (Pre-gap) (bytes)
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/// - 8 B: Index1 (Start of track) (bytes)
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/// - 8 B: End of track + 1 (bytes)
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pub fn read_nrg_daox(fd: &mut File) -> Result<NrgDaox, NrgError> {
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let mut chunk = NrgDaox::new();
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chunk.size = try!(read_u32(fd));
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let mut bytes_read = 0;
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chunk.size2 = try!(read_u32(fd));
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bytes_read += 4; // 32 bits
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chunk.upc = try!(read_sized_string(fd, 13));
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bytes_read += 13;
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chunk.padding = try!(read_u8(fd));
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bytes_read += 1;
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chunk.toc_type = try!(read_u16(fd));
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bytes_read += 2;
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chunk.first_track = try!(read_u8(fd));
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chunk.last_track = try!(read_u8(fd));
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bytes_read += 2;
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// Read all the 42-byte track info
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while bytes_read < chunk.size {
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chunk.tracks.push(try!(read_nrg_daox_track(fd)));
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bytes_read += 42;
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}
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assert_eq!(bytes_read, chunk.size);
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Ok(chunk)
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}
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/// Reads a track from the NRG DAO Information.
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fn read_nrg_daox_track(fd: &mut File) -> Result<NrgDaoxTrack, NrgError> {
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let mut track = NrgDaoxTrack::new();
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track.isrc = try!(read_sized_string(fd, 12));
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track.sector_size = try!(read_u16(fd));
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track.data_mode = try!(read_u16(fd));
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track.unknown = try!(read_u16(fd));
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track.index0 = try!(read_u64(fd));
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track.index1 = try!(read_u64(fd));
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track.track_end = try!(read_u64(fd));
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Ok(track)
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}
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