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Move metadata-related modules into metadata

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master
Matteo Cypriani 7 years ago
parent 1a029d44a4
commit e2a41e6282
10 changed files with 283 additions and 258 deletions
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2
src/error.rs
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@ -1,3 +1,5 @@
//! Error type for NRGrip.
use std::error::Error;
use std::fmt;
use std::io;

254
src/lib.rs
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@ -1,252 +1,2 @@
use std::fs::File;
use std::io::{Seek, SeekFrom};
mod error;
use error::NrgError;
mod metadata;
use metadata::NrgMetadata;
mod cuex;
use cuex::{NrgCuex, NrgCuexTrack};
mod daox;
use daox::{NrgDaox, NrgDaoxTrack};
mod sinf;
use sinf::{NrgSinf};
mod mtyp;
use mtyp::{NrgMtyp};
mod readers;
use readers::*;
pub fn parse_nrg_metadata(img_name: String) -> Result<NrgMetadata, NrgError> {
let mut nm = NrgMetadata::new();
// Open the image file
let mut fd = try!(File::open(img_name));
// Get the file size
nm.file_size = try!(fd.seek(SeekFrom::End(0)));
// Get the NRG format from the footer
nm.nrg_version = try!(read_nrg_version(&mut fd, nm.file_size));
if nm.nrg_version != 2 {
// We handle only NRG v2
return Err(NrgError::NrgFormatV1);
}
// Read the first chunk offset
nm.chunk_offset = try!(read_u64(&mut fd));
// Read all the chunks
try!(fd.seek(SeekFrom::Start(nm.chunk_offset)));
try!(read_nrg_chunks(&mut fd, &mut nm));
Ok(nm)
}
/// Determines the NRG format of an open NRG image `fd` of file `file_size`.
///
/// The offset is left after the main chunk ID, therefore the calling function
/// can read the first data chunk's offset (32 bits for NRG v1 or 64 bits for
/// NRG v2) directly without seeking.
fn read_nrg_version(fd: &mut File, file_size: u64) -> Result<u8, NrgError> {
if file_size < 12 {
// Input file too small
return Err(NrgError::NrgFormat);
}
// In NRG v2, the main footer is on the last 12 bytes
try!(fd.seek(SeekFrom::End(-12)));
let chunk_id = try!(read_nrg_chunk_id(fd));
if chunk_id == "NER5" {
return Ok(2); // NRG v2
}
// In NRG v1, the main footer is on the last 8 bytes; since we just read 4
// bytes after seeking 12 bytes before the end, the offset is right
let chunk_id = try!(read_nrg_chunk_id(fd));
if chunk_id == "NERO" {
return Ok(1); // NRG v1
}
Err(NrgError::NrgFormat) // Unknown format
}
/// Reads all the available NRG chunks.
///
/// Returns the number of chunks read.
fn read_nrg_chunks(fd: &mut File, nm: &mut NrgMetadata) -> Result<u16, NrgError> {
let mut nread = 0u16;
loop {
let chunk_id = try!(read_nrg_chunk_id(fd));
nread += 1;
match chunk_id.as_ref() {
"END!" => break,
"CUEX" => { nm.cuex_chunk = Some(try!(read_nrg_cuex(fd))); },
"DAOX" => { nm.daox_chunk = Some(try!(read_nrg_daox(fd))); },
"CDTX" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"ETN2" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"SINF" => { nm.sinf_chunk = Some(try!(read_nrg_sinf(fd))); },
"MTYP" => { nm.mtyp_chunk = Some(try!(read_nrg_mtyp(fd))); },
"DINF" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"TOCT" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"RELO" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
_ => { println!("{}", chunk_id); return Err(NrgError::NrgChunkId); }, //fixme
}
}
Ok(nread)
}
/// Reads an NRG chunk ID (i.e. a 4-byte string) from `fd`.
fn read_nrg_chunk_id(fd: &File) -> Result<String, NrgError> {
read_sized_string(fd, 4)
}
fn skip_unhandled_chunk(fd: &mut File, chunk_id: &str) -> Result<(), NrgError> {
let chunk_size = try!(read_u32(fd));
try!(fd.seek(SeekFrom::Current(chunk_size as i64)));
// fixme: lib should'nt print!
println!("Skipping unhandled chunk: {} ({} bytes)", chunk_id, chunk_size);
Ok(())
}
/// Reads the NRG Cue Sheet chunk (CUEX).
///
/// The CUEX is constituted of the following data:
///
/// - 4 B: Chunk size (in bytes): size to be read *after* this chunk size
/// (should be a multiple of 8)
///
/// - one or more pairs of 8-byte blocks composed of:
/// + 1 B: Mode (values found: 0x01 for audio; 0x21 for non
/// copyright-protected audio; 0x41 for data)
/// + 1 B: Track number (BCD coded; 0xAA for the lead-out area)
/// + 1 B: Index number (probably BCD coded): 0 or 1
/// + 1 B: Unknown (padding?), always 0
/// + 4 B: Position in sectors (signed integer value)
///
/// - one last block like the ones above, for the lead-out area (optional?)
fn read_nrg_cuex(fd: &mut File) -> Result<NrgCuex, NrgError> {
let mut chunk = NrgCuex::new();
chunk.size = try!(read_u32(fd));
let mut bytes_read = 0;
// Read all the 8-byte track info
while bytes_read < chunk.size {
chunk.tracks.push(try!(read_nrg_cuex_track(fd)));
bytes_read += 8;
}
assert_eq!(bytes_read, chunk.size);
Ok(chunk)
}
/// Reads a track from the NRG cue sheet.
fn read_nrg_cuex_track(fd: &mut File) -> Result<NrgCuexTrack, NrgError> {
let mut track = NrgCuexTrack::new();
track.mode = try!(read_u8(fd));
track.track_number = try!(read_u8(fd));
track.index_number = try!(read_u8(fd));
track.padding = try!(read_u8(fd));
track.position_sectors = try!(read_u32(fd)) as i32;
Ok(track)
}
/// Reads the NRG Disc-At-Once Information chunk (DAOX).
///
/// The DAOX is constituted of the following data:
///
/// - 4 B: Chunk size (in bytes)
/// - 4 B: Chunk size again, sometimes little endian
/// - 13 B: UPC (text) or null bytes
/// - 1 B: Unknown (padding?), always 0
/// - 2 B: TOC type
/// - 1 B: First track in the session
/// - 1 B: Last track in the session
///
/// Followed by one or more groups of 42-byte blocks composed of:
/// - 12 B: ISRC (text) or null bytes
/// - 2 B: Sector size in the image file (bytes)
/// - 2 B: Mode of the data in the image file
/// - 2 B: Unknown (should always be 0x0001)
/// - 8 B: Index0 (Pre-gap) (bytes)
/// - 8 B: Index1 (Start of track) (bytes)
/// - 8 B: End of track + 1 (bytes)
fn read_nrg_daox(fd: &mut File) -> Result<NrgDaox, NrgError> {
let mut chunk = NrgDaox::new();
chunk.size = try!(read_u32(fd));
let mut bytes_read = 0;
chunk.size2 = try!(read_u32(fd));
bytes_read += 4; // 32 bits
chunk.upc = try!(read_sized_string(fd, 13));
bytes_read += 13;
chunk.padding = try!(read_u8(fd));
bytes_read += 1;
chunk.toc_type = try!(read_u16(fd));
bytes_read += 2;
chunk.first_track = try!(read_u8(fd));
chunk.last_track = try!(read_u8(fd));
bytes_read += 2;
// Read all the 42-byte track info
while bytes_read < chunk.size {
chunk.tracks.push(try!(read_nrg_daox_track(fd)));
bytes_read += 42;
}
assert_eq!(bytes_read, chunk.size);
Ok(chunk)
}
/// Reads a track from the NRG DAO Information.
fn read_nrg_daox_track(fd: &mut File) -> Result<NrgDaoxTrack, NrgError> {
let mut track = NrgDaoxTrack::new();
track.isrc = try!(read_sized_string(fd, 12));
track.sector_size = try!(read_u16(fd));
track.data_mode = try!(read_u16(fd));
track.unknown = try!(read_u16(fd));
track.index0 = try!(read_u64(fd));
track.index1 = try!(read_u64(fd));
track.track_end = try!(read_u64(fd));
Ok(track)
}
/// Reads the NRG Session Information chunk (SINF).
fn read_nrg_sinf(fd: &mut File) -> Result<NrgSinf, NrgError> {
let mut chunk = NrgSinf::new();
chunk.size = try!(read_u32(fd));
chunk.nb_tracks = try!(read_u32(fd));
Ok(chunk)
}
/// Reads the Media Type (?) chunk (MTYP).
fn read_nrg_mtyp(fd: &mut File) -> Result<NrgMtyp, NrgError> {
let mut chunk = NrgMtyp::new();
chunk.size = try!(read_u32(fd));
chunk.unknown = try!(read_u32(fd));
Ok(chunk)
}
pub mod metadata;
pub mod error;

2
src/main.rs
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@ -27,7 +27,7 @@ fn main() {
exit_usage(&prog_name);
}
match nrgrip::parse_nrg_metadata(img_name) {
match nrgrip::metadata::parse_nrg_metadata(img_name) {
Err(err) => println!("{}", err.to_string()),
Ok(metadata) => println!("\n\
*** Metadata ***\n\

51
src/cuex.rs → src/metadata/cuex.rs
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@ -1,4 +1,10 @@
//! NRG CUEX chunk data structure and associated functions.
use std::fmt;
use std::fs::File;
use ::error::NrgError;
use super::readers::*;
#[derive(Debug)]
@ -82,3 +88,48 @@ impl fmt::Display for NrgCuexTrack {
self.position_sectors, position_seconds)
}
}
/// Reads the NRG Cue Sheet chunk (CUEX) from `fd`.
///
/// The CUEX is constituted of the following data:
///
/// - 4 B: Chunk size (in bytes): size to be read *after* this chunk size
/// (should be a multiple of 8)
///
/// - one or more pairs of 8-byte blocks composed of:
/// + 1 B: Mode (values found: 0x01 for audio; 0x21 for non
/// copyright-protected audio; 0x41 for data)
/// + 1 B: Track number (BCD coded; 0xAA for the lead-out area)
/// + 1 B: Index number (probably BCD coded): 0 or 1
/// + 1 B: Unknown (padding?), always 0
/// + 4 B: Position in sectors (signed integer value)
///
/// - one last block like the ones above, for the lead-out area (optional?)
pub fn read_nrg_cuex(fd: &mut File) -> Result<NrgCuex, NrgError> {
let mut chunk = NrgCuex::new();
chunk.size = try!(read_u32(fd));
let mut bytes_read = 0;
// Read all the 8-byte track info
while bytes_read < chunk.size {
chunk.tracks.push(try!(read_nrg_cuex_track(fd)));
bytes_read += 8;
}
assert_eq!(bytes_read, chunk.size);
Ok(chunk)
}
/// Reads a track from the NRG cue sheet.
fn read_nrg_cuex_track(fd: &mut File) -> Result<NrgCuexTrack, NrgError> {
let mut track = NrgCuexTrack::new();
track.mode = try!(read_u8(fd));
track.track_number = try!(read_u8(fd));
track.index_number = try!(read_u8(fd));
track.padding = try!(read_u8(fd));
track.position_sectors = try!(read_u32(fd)) as i32;
Ok(track)
}

73
src/daox.rs → src/metadata/daox.rs
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@ -1,4 +1,10 @@
//! NRG DAOX chunk data structure and associated functions.
use std::fmt;
use std::fs::File;
use ::error::NrgError;
use super::readers::*;
#[derive(Debug)]
@ -116,3 +122,70 @@ impl fmt::Display for NrgDaoxTrack {
self.track_end)
}
}
/// Reads the NRG Disc-At-Once Information chunk (DAOX).
///
/// The DAOX is constituted of the following data:
///
/// - 4 B: Chunk size (in bytes)
/// - 4 B: Chunk size again, sometimes little endian
/// - 13 B: UPC (text) or null bytes
/// - 1 B: Unknown (padding?), always 0
/// - 2 B: TOC type
/// - 1 B: First track in the session
/// - 1 B: Last track in the session
///
/// Followed by one or more groups of 42-byte blocks composed of:
/// - 12 B: ISRC (text) or null bytes
/// - 2 B: Sector size in the image file (bytes)
/// - 2 B: Mode of the data in the image file
/// - 2 B: Unknown (should always be 0x0001)
/// - 8 B: Index0 (Pre-gap) (bytes)
/// - 8 B: Index1 (Start of track) (bytes)
/// - 8 B: End of track + 1 (bytes)
pub fn read_nrg_daox(fd: &mut File) -> Result<NrgDaox, NrgError> {
let mut chunk = NrgDaox::new();
chunk.size = try!(read_u32(fd));
let mut bytes_read = 0;
chunk.size2 = try!(read_u32(fd));
bytes_read += 4; // 32 bits
chunk.upc = try!(read_sized_string(fd, 13));
bytes_read += 13;
chunk.padding = try!(read_u8(fd));
bytes_read += 1;
chunk.toc_type = try!(read_u16(fd));
bytes_read += 2;
chunk.first_track = try!(read_u8(fd));
chunk.last_track = try!(read_u8(fd));
bytes_read += 2;
// Read all the 42-byte track info
while bytes_read < chunk.size {
chunk.tracks.push(try!(read_nrg_daox_track(fd)));
bytes_read += 42;
}
assert_eq!(bytes_read, chunk.size);
Ok(chunk)
}
/// Reads a track from the NRG DAO Information.
fn read_nrg_daox_track(fd: &mut File) -> Result<NrgDaoxTrack, NrgError> {
let mut track = NrgDaoxTrack::new();
track.isrc = try!(read_sized_string(fd, 12));
track.sector_size = try!(read_u16(fd));
track.data_mode = try!(read_u16(fd));
track.unknown = try!(read_u16(fd));
track.index0 = try!(read_u64(fd));
track.index1 = try!(read_u64(fd));
track.track_end = try!(read_u64(fd));
Ok(track)
}

10
src/metadata.rs → src/metadata/metadata.rs
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@ -1,9 +1,11 @@
//! NRG metadata structure, storing the contents of all of the NRG chunks.
use std::fmt;
use cuex::NrgCuex;
use daox::NrgDaox;
use sinf::NrgSinf;
use mtyp::NrgMtyp;
use super::cuex::NrgCuex;
use super::daox::NrgDaox;
use super::sinf::NrgSinf;
use super::mtyp::NrgMtyp;
#[derive(Debug)]

115
src/metadata/mod.rs
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@ -0,0 +1,115 @@
//! Module to read and store the metadata from an NRG image file.
use std::fs::File;
use std::io::{Seek, SeekFrom};
use ::error::NrgError;
mod metadata;
mod cuex;
mod daox;
mod sinf;
mod mtyp;
mod readers;
use self::metadata::NrgMetadata;
use self::readers::*;
pub fn parse_nrg_metadata(img_name: String) -> Result<NrgMetadata, NrgError> {
let mut nm = NrgMetadata::new();
// Open the image file
let mut fd = try!(File::open(img_name));
// Get the file size
nm.file_size = try!(fd.seek(SeekFrom::End(0)));
// Get the NRG format from the footer
nm.nrg_version = try!(read_nrg_version(&mut fd, nm.file_size));
if nm.nrg_version != 2 {
// We handle only NRG v2
return Err(NrgError::NrgFormatV1);
}
// Read the first chunk offset
nm.chunk_offset = try!(read_u64(&mut fd));
// Read all the chunks
try!(fd.seek(SeekFrom::Start(nm.chunk_offset)));
try!(read_nrg_chunks(&mut fd, &mut nm));
Ok(nm)
}
/// Determines the NRG format of an open NRG image `fd` of file `file_size`.
///
/// The offset is left after the main chunk ID, therefore the calling function
/// can read the first data chunk's offset (32 bits for NRG v1 or 64 bits for
/// NRG v2) directly without seeking.
fn read_nrg_version(fd: &mut File, file_size: u64) -> Result<u8, NrgError> {
if file_size < 12 {
// Input file too small
return Err(NrgError::NrgFormat);
}
// In NRG v2, the main footer is on the last 12 bytes
try!(fd.seek(SeekFrom::End(-12)));
let chunk_id = try!(read_nrg_chunk_id(fd));
if chunk_id == "NER5" {
return Ok(2); // NRG v2
}
// In NRG v1, the main footer is on the last 8 bytes; since we just read 4
// bytes after seeking 12 bytes before the end, the offset is right
let chunk_id = try!(read_nrg_chunk_id(fd));
if chunk_id == "NERO" {
return Ok(1); // NRG v1
}
Err(NrgError::NrgFormat) // Unknown format
}
/// Reads all the available NRG chunks.
///
/// Returns the number of chunks read.
fn read_nrg_chunks(fd: &mut File, nm: &mut NrgMetadata) -> Result<u16, NrgError> {
let mut nread = 0u16;
loop {
let chunk_id = try!(read_nrg_chunk_id(fd));
nread += 1;
match chunk_id.as_ref() {
"END!" => break,
"CUEX" => { nm.cuex_chunk = Some(try!(cuex::read_nrg_cuex(fd))); },
"DAOX" => { nm.daox_chunk = Some(try!(daox::read_nrg_daox(fd))); },
"CDTX" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"ETN2" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"SINF" => { nm.sinf_chunk = Some(try!(sinf::read_nrg_sinf(fd))); },
"MTYP" => { nm.mtyp_chunk = Some(try!(mtyp::read_nrg_mtyp(fd))); },
"DINF" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"TOCT" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
"RELO" => { try!(skip_unhandled_chunk(fd, &chunk_id)); },
_ => { println!("{}", chunk_id); return Err(NrgError::NrgChunkId); }, //fixme
}
}
Ok(nread)
}
/// Reads an NRG chunk ID (i.e. a 4-byte string) from `fd`.
fn read_nrg_chunk_id(fd: &File) -> Result<String, NrgError> {
read_sized_string(fd, 4)
}
fn skip_unhandled_chunk(fd: &mut File, chunk_id: &str) -> Result<(), NrgError> {
let chunk_size = try!(read_u32(fd));
try!(fd.seek(SeekFrom::Current(chunk_size as i64)));
// fixme: lib should'nt print!
println!("Skipping unhandled chunk: {} ({} bytes)", chunk_id, chunk_size);
Ok(())
}

15
src/mtyp.rs → src/metadata/mtyp.rs
Unescape Escape View File

@ -1,4 +1,10 @@
//! NRG MTYP chunk data structure and associated functions.
use std::fmt;
use std::fs::File;
use ::error::NrgError;
use super::readers::read_u32;
#[derive(Debug)]
@ -26,3 +32,12 @@ impl fmt::Display for NrgMtyp {
self.unknown)
}
}
/// Reads the Media Type (?) chunk (MTYP).
pub fn read_nrg_mtyp(fd: &mut File) -> Result<NrgMtyp, NrgError> {
let mut chunk = NrgMtyp::new();
chunk.size = try!(read_u32(fd));
chunk.unknown = try!(read_u32(fd));
Ok(chunk)
}

4
src/readers.rs → src/metadata/readers.rs
Unescape Escape View File

@ -1,8 +1,10 @@
//! Miscellaneous functions to read fixed-size data from a file.
use std::fs::File;
use std::io::Read;
use std::mem;
use error::NrgError;
use ::error::NrgError;
/// Reads a String of size `size` from `fd`.

15
src/sinf.rs → src/metadata/sinf.rs
Unescape Escape View File

@ -1,4 +1,10 @@
//! NRG SINF chunk data structure and associated functions.
use std::fmt;
use std::fs::File;
use ::error::NrgError;
use super::readers::read_u32;
#[derive(Debug)]
@ -26,3 +32,12 @@ impl fmt::Display for NrgSinf {
self.nb_tracks)
}
}
/// Reads the NRG Session Information chunk (SINF).
pub fn read_nrg_sinf(fd: &mut File) -> Result<NrgSinf, NrgError> {
let mut chunk = NrgSinf::new();
chunk.size = try!(read_u32(fd));
chunk.nb_tracks = try!(read_u32(fd));
Ok(chunk)
}
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