Move metadata-related modules into metadata
parent
1a029d44a4
commit
e2a41e6282
@ -1,252 +1,2 @@
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use std::fs::File;
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use std::io::{Seek, SeekFrom};
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mod error;
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use error::NrgError;
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mod metadata;
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use metadata::NrgMetadata;
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mod cuex;
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use cuex::{NrgCuex, NrgCuexTrack};
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mod daox;
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use daox::{NrgDaox, NrgDaoxTrack};
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mod sinf;
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use sinf::{NrgSinf};
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mod mtyp;
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use mtyp::{NrgMtyp};
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mod readers;
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use readers::*;
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pub fn parse_nrg_metadata(img_name: String) -> Result<NrgMetadata, NrgError> {
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let mut nm = NrgMetadata::new();
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// Open the image file
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let mut fd = try!(File::open(img_name));
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// Get the file size
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nm.file_size = try!(fd.seek(SeekFrom::End(0)));
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// Get the NRG format from the footer
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nm.nrg_version = try!(read_nrg_version(&mut fd, nm.file_size));
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if nm.nrg_version != 2 {
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// We handle only NRG v2
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return Err(NrgError::NrgFormatV1);
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}
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// Read the first chunk offset
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nm.chunk_offset = try!(read_u64(&mut fd));
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// Read all the chunks
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try!(fd.seek(SeekFrom::Start(nm.chunk_offset)));
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try!(read_nrg_chunks(&mut fd, &mut nm));
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Ok(nm)
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}
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/// Determines the NRG format of an open NRG image `fd` of file `file_size`.
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///
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/// The offset is left after the main chunk ID, therefore the calling function
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/// can read the first data chunk's offset (32 bits for NRG v1 or 64 bits for
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/// NRG v2) directly without seeking.
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fn read_nrg_version(fd: &mut File, file_size: u64) -> Result<u8, NrgError> {
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if file_size < 12 {
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// Input file too small
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return Err(NrgError::NrgFormat);
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}
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// In NRG v2, the main footer is on the last 12 bytes
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try!(fd.seek(SeekFrom::End(-12)));
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let chunk_id = try!(read_nrg_chunk_id(fd));
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if chunk_id == "NER5" {
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return Ok(2); // NRG v2
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}
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// In NRG v1, the main footer is on the last 8 bytes; since we just read 4
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// bytes after seeking 12 bytes before the end, the offset is right
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let chunk_id = try!(read_nrg_chunk_id(fd));
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if chunk_id == "NERO" {
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return Ok(1); // NRG v1
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}
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Err(NrgError::NrgFormat) // Unknown format
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}
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/// Reads all the available NRG chunks.
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///
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/// Returns the number of chunks read.
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fn read_nrg_chunks(fd: &mut File, nm: &mut NrgMetadata) -> Result<u16, NrgError> {
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let mut nread = 0u16;
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loop {
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let chunk_id = try!(read_nrg_chunk_id(fd));
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nread += 1;
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match chunk_id.as_ref() {
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"END!" => break,
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"CUEX" => { nm.cuex_chunk = Some(try!(read_nrg_cuex(fd))); },
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"DAOX" => { nm.daox_chunk = Some(try!(read_nrg_daox(fd))); },
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"CDTX" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"ETN2" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"SINF" => { nm.sinf_chunk = Some(try!(read_nrg_sinf(fd))); },
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"MTYP" => { nm.mtyp_chunk = Some(try!(read_nrg_mtyp(fd))); },
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"DINF" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"TOCT" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"RELO" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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_ => { println!("{}", chunk_id); return Err(NrgError::NrgChunkId); }, //fixme
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}
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}
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Ok(nread)
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}
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/// Reads an NRG chunk ID (i.e. a 4-byte string) from `fd`.
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fn read_nrg_chunk_id(fd: &File) -> Result<String, NrgError> {
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read_sized_string(fd, 4)
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}
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fn skip_unhandled_chunk(fd: &mut File, chunk_id: &str) -> Result<(), NrgError> {
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let chunk_size = try!(read_u32(fd));
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try!(fd.seek(SeekFrom::Current(chunk_size as i64)));
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// fixme: lib should'nt print!
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println!("Skipping unhandled chunk: {} ({} bytes)", chunk_id, chunk_size);
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Ok(())
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}
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/// Reads the NRG Cue Sheet chunk (CUEX).
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///
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/// The CUEX is constituted of the following data:
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///
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/// - 4 B: Chunk size (in bytes): size to be read *after* this chunk size
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/// (should be a multiple of 8)
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///
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/// - one or more pairs of 8-byte blocks composed of:
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/// + 1 B: Mode (values found: 0x01 for audio; 0x21 for non
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/// copyright-protected audio; 0x41 for data)
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/// + 1 B: Track number (BCD coded; 0xAA for the lead-out area)
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/// + 1 B: Index number (probably BCD coded): 0 or 1
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/// + 1 B: Unknown (padding?), always 0
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/// + 4 B: Position in sectors (signed integer value)
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///
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/// - one last block like the ones above, for the lead-out area (optional?)
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fn read_nrg_cuex(fd: &mut File) -> Result<NrgCuex, NrgError> {
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let mut chunk = NrgCuex::new();
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chunk.size = try!(read_u32(fd));
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let mut bytes_read = 0;
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// Read all the 8-byte track info
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while bytes_read < chunk.size {
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chunk.tracks.push(try!(read_nrg_cuex_track(fd)));
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bytes_read += 8;
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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 cue sheet.
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fn read_nrg_cuex_track(fd: &mut File) -> Result<NrgCuexTrack, NrgError> {
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let mut track = NrgCuexTrack::new();
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track.mode = try!(read_u8(fd));
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track.track_number = try!(read_u8(fd));
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track.index_number = try!(read_u8(fd));
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track.padding = try!(read_u8(fd));
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track.position_sectors = try!(read_u32(fd)) as i32;
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Ok(track)
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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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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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/// Reads the NRG Session Information chunk (SINF).
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fn read_nrg_sinf(fd: &mut File) -> Result<NrgSinf, NrgError> {
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let mut chunk = NrgSinf::new();
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chunk.size = try!(read_u32(fd));
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chunk.nb_tracks = try!(read_u32(fd));
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Ok(chunk)
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}
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/// Reads the Media Type (?) chunk (MTYP).
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fn read_nrg_mtyp(fd: &mut File) -> Result<NrgMtyp, NrgError> {
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let mut chunk = NrgMtyp::new();
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chunk.size = try!(read_u32(fd));
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chunk.unknown = try!(read_u32(fd));
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Ok(chunk)
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}
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pub mod metadata;
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pub mod error;
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@ -1,9 +1,11 @@
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//! NRG metadata structure, storing the contents of all of the NRG chunks.
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use std::fmt;
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use cuex::NrgCuex;
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use daox::NrgDaox;
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use sinf::NrgSinf;
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use mtyp::NrgMtyp;
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use super::cuex::NrgCuex;
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use super::daox::NrgDaox;
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use super::sinf::NrgSinf;
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use super::mtyp::NrgMtyp;
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#[derive(Debug)]
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@ -0,0 +1,115 @@
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//! Module to read and store the metadata from an NRG image file.
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use std::fs::File;
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use std::io::{Seek, SeekFrom};
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use ::error::NrgError;
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mod metadata;
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mod cuex;
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mod daox;
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mod sinf;
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mod mtyp;
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mod readers;
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use self::metadata::NrgMetadata;
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use self::readers::*;
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pub fn parse_nrg_metadata(img_name: String) -> Result<NrgMetadata, NrgError> {
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let mut nm = NrgMetadata::new();
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// Open the image file
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let mut fd = try!(File::open(img_name));
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// Get the file size
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nm.file_size = try!(fd.seek(SeekFrom::End(0)));
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// Get the NRG format from the footer
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nm.nrg_version = try!(read_nrg_version(&mut fd, nm.file_size));
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if nm.nrg_version != 2 {
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// We handle only NRG v2
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return Err(NrgError::NrgFormatV1);
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}
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// Read the first chunk offset
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nm.chunk_offset = try!(read_u64(&mut fd));
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// Read all the chunks
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try!(fd.seek(SeekFrom::Start(nm.chunk_offset)));
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try!(read_nrg_chunks(&mut fd, &mut nm));
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Ok(nm)
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}
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/// Determines the NRG format of an open NRG image `fd` of file `file_size`.
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///
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/// The offset is left after the main chunk ID, therefore the calling function
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/// can read the first data chunk's offset (32 bits for NRG v1 or 64 bits for
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/// NRG v2) directly without seeking.
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fn read_nrg_version(fd: &mut File, file_size: u64) -> Result<u8, NrgError> {
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if file_size < 12 {
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// Input file too small
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return Err(NrgError::NrgFormat);
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}
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// In NRG v2, the main footer is on the last 12 bytes
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try!(fd.seek(SeekFrom::End(-12)));
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let chunk_id = try!(read_nrg_chunk_id(fd));
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if chunk_id == "NER5" {
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return Ok(2); // NRG v2
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}
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// In NRG v1, the main footer is on the last 8 bytes; since we just read 4
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// bytes after seeking 12 bytes before the end, the offset is right
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let chunk_id = try!(read_nrg_chunk_id(fd));
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if chunk_id == "NERO" {
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return Ok(1); // NRG v1
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}
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Err(NrgError::NrgFormat) // Unknown format
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}
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/// Reads all the available NRG chunks.
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///
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/// Returns the number of chunks read.
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fn read_nrg_chunks(fd: &mut File, nm: &mut NrgMetadata) -> Result<u16, NrgError> {
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let mut nread = 0u16;
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loop {
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let chunk_id = try!(read_nrg_chunk_id(fd));
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nread += 1;
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match chunk_id.as_ref() {
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"END!" => break,
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"CUEX" => { nm.cuex_chunk = Some(try!(cuex::read_nrg_cuex(fd))); },
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"DAOX" => { nm.daox_chunk = Some(try!(daox::read_nrg_daox(fd))); },
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"CDTX" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"ETN2" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"SINF" => { nm.sinf_chunk = Some(try!(sinf::read_nrg_sinf(fd))); },
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"MTYP" => { nm.mtyp_chunk = Some(try!(mtyp::read_nrg_mtyp(fd))); },
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"DINF" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"TOCT" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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"RELO" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
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_ => { println!("{}", chunk_id); return Err(NrgError::NrgChunkId); }, //fixme
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}
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}
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Ok(nread)
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}
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/// Reads an NRG chunk ID (i.e. a 4-byte string) from `fd`.
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fn read_nrg_chunk_id(fd: &File) -> Result<String, NrgError> {
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read_sized_string(fd, 4)
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}
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fn skip_unhandled_chunk(fd: &mut File, chunk_id: &str) -> Result<(), NrgError> {
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let chunk_size = try!(read_u32(fd));
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try!(fd.seek(SeekFrom::Current(chunk_size as i64)));
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// fixme: lib should'nt print!
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println!("Skipping unhandled chunk: {} ({} bytes)", chunk_id, chunk_size);
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Ok(())
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}
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@ -1,8 +1,10 @@
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//! Miscellaneous functions to read fixed-size data from a file.
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use std::fs::File;
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use std::io::Read;
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use std::mem;
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use error::NrgError;
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use ::error::NrgError;
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/// Reads a String of size `size` from `fd`.
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