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Cue sheet display working

Initial commit with only cue sheet reading and display.
master
Matteo Cypriani 4 years ago
commit
f22f7fdbc3
4 changed files with 431 additions and 0 deletions
  1. +4
    -0
      Cargo.lock
  2. +6
    -0
      Cargo.toml
  3. +385
    -0
      src/lib.rs
  4. +36
    -0
      src/main.rs

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- 0
Cargo.lock View File

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[root]
name = "nrgrip"
version = "0.1.0"

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- 0
Cargo.toml View File

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[package]
name = "nrgrip"
version = "0.1.0"
authors = ["Matteo Cypriani <mcy@lm7.fr>"]
[dependencies]

+ 385
- 0
src/lib.rs View File

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use std::error::Error;
use std::fmt;
use std::fs::File;
use std::io::{self, Read, Seek, SeekFrom};
use std::mem;
#[derive(Debug)]
pub enum NrgError {
Io(io::Error),
NrgFormat,
NrgFormatV1,
NrgChunkId,
}
impl fmt::Display for NrgError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
NrgError::Io(ref err) => err.fmt(f),
NrgError::NrgFormat => write!(f, "NRG format unknown."),
NrgError::NrgFormatV1 => write!(f, "NRG v1 format is not handled."),
NrgError::NrgChunkId => write!(f, "NRG chunk ID unknown."),
}
}
}
impl Error for NrgError {
fn description(&self) -> &str {
match *self {
NrgError::Io(ref err) => err.description(),
NrgError::NrgFormat => "NRG format",
NrgError::NrgFormatV1 => "NRG format v1",
NrgError::NrgChunkId => "NRG chunk ID",
}
}
fn cause(&self) -> Option<&Error> {
match *self {
NrgError::Io(ref err) => Some(err),
NrgError::NrgFormat => None,
NrgError::NrgFormatV1 => None,
NrgError::NrgChunkId => None,
}
}
}
impl From<io::Error> for NrgError {
fn from(err: io::Error) -> NrgError {
NrgError::Io(err)
}
}
#[derive(Debug)]
pub struct NrgMetadata {
pub file_size: u64,
pub nrg_version: u8,
pub chunk_offset: u64,
pub cuex_chunk: Option<NrgCuex>,
}
impl NrgMetadata {
fn new() -> NrgMetadata {
NrgMetadata {
file_size: 0,
nrg_version: 0,
chunk_offset: 0,
cuex_chunk: None,
}
}
}
impl fmt::Display for NrgMetadata {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
try!(write!(f, "Image size: {}\n\
NRG format version: {}\n\
First chunk offset: {}",
self.file_size,
self.nrg_version,
self.chunk_offset,
));
match self.cuex_chunk {
None => {},
Some(ref chunk) => try!(write!(f, "\n\
{}", chunk)),
}
Ok(())
}
}
#[derive(Debug)]
pub struct NrgCuex {
pub size: u32,
pub tracks: Vec<NrgCuexTrack>,
}
impl NrgCuex {
fn new() -> NrgCuex {
NrgCuex {
size: 0,
tracks: Vec::new(),
}
}
}
impl fmt::Display for NrgCuex {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
try!(write!(f, "Chunk ID: CUEX\n\
Chunk description: Cue Sheet\n\
Chunk size: {}", self.size));
if self.tracks.is_empty() {
try!(write!(f, "\nNo CUEX tracks!"));
} else {
for track in &self.tracks {
try!(write!(f, "\n\
Track:\n\
{}", track));
}
}
Ok(())
}
}
#[derive(Debug)]
pub struct NrgCuexTrack {
mode: u8,
track_number: u8,
index_number: u8,
padding: u8,
position_sectors: i32,
}
impl NrgCuexTrack {
fn new() -> NrgCuexTrack {
NrgCuexTrack {
mode: 0,
track_number: 0,
index_number: 0,
padding: 0,
position_sectors: 0,
}
}
}
impl fmt::Display for NrgCuexTrack {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
try!(writeln!(f, "\tMode: 0x{:02X}", self.mode));
try!(write!(f, "\tTrack number: "));
if self.track_number == 0 {
try!(writeln!(f, "0 (lead-in area)"));
} else if self.track_number == 0xAA {
try!(writeln!(f, "0xAA (lead-out area)"));
} else {
try!(writeln!(f, "{}", self.track_number));
}
try!(writeln!(f, "\tIndex number: {}", self.index_number));
if self.padding != 0 {
try!(writeln!(f, "\tPadding: {} (Warning: should be 0!)",
self.padding));
}
// Audio CDs are played at a 75 sectors per second rate:
let position_seconds: f64 = (self.position_sectors as f64) / 75.0;
write!(f, "\tPosition: {} sectors ({:.2} seconds)",
self.position_sectors, position_seconds)
}
}
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(mut 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(&mut fd))); },
"DAOX" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
//"DAOX" => { try!(read_nrg_daox(&mut fd)); },
"CDTX" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
"ETN2" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
"SINF" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
"MTYP" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
// "SINF" => { try!(read_nrg_sinf(&mut fd)); },
// "MTYP" => { try!(read_nrg_mytp(&mut fd)); },
"DINF" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
"TOCT" => { try!(skip_unhandled_chunk(&mut fd, &chunk_id)); },
"RELO" => { try!(skip_unhandled_chunk(&mut 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> {
let mut handle = fd.take(4);
let mut chunk_id = String::new();
try!(handle.read_to_string(&mut chunk_id));
Ok(chunk_id)
}
/// Reads a 64-bit unsigned integer from `fd`.
fn read_u64(fd: &mut File) -> Result<u64, NrgError> {
let mut buf = [0u8; 8];
try!(fd.read_exact(&mut buf));
let i: u64;
unsafe {
i = mem::transmute(buf);
}
Ok(u64::from_be(i))
}
/// Reads a 32-bit unsigned integer from `fd`.
fn read_u32(fd: &mut File) -> Result<u32, NrgError> {
let mut buf = [0u8; 4];
try!(fd.read_exact(&mut buf));
let i: u32;
unsafe {
i = mem::transmute(buf);
}
Ok(u32::from_be(i))
}
/// Reads a 16-bit unsigned integer from `fd`.
#[cfg(dead_code)]
fn read_u16(fd: &mut File) -> Result<u16, NrgError> {
let mut buf = [0u8; 2];
try!(fd.read_exact(&mut buf));
let i: u16;
unsafe {
i = mem::transmute(buf);
}
Ok(u16::from_be(i))
}
/// Reads an unsigned byte from `fd`.
fn read_u8(fd: &mut File) -> Result<u8, NrgError> {
let mut buf = [0u8; 1];
try!(fd.read_exact(&mut buf));
Ok(buf[0])
}
fn skip_unhandled_chunk(mut fd: &mut File, chunk_id: &str) -> Result<(), NrgError> {
let chunk_size = try!(read_u32(&mut 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 (bytes): size to be read *after* this (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(mut fd: &mut File) -> Result<NrgCuex, NrgError> {
let mut chunk = NrgCuex::new();
chunk.size = try!(read_u32(&mut 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(&mut 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(mut fd: &mut File) -> Result<NrgCuexTrack, NrgError> {
let mut track = NrgCuexTrack::new();
track.mode = try!(read_u8(&mut fd));
track.track_number = try!(read_u8(&mut fd));
track.index_number = try!(read_u8(&mut fd));
track.padding = try!(read_u8(&mut fd));
track.position_sectors = try!(read_u32(&mut fd)) as i32;
Ok(track)
}
#[cfg(dead_code)]
fn read_nrg_daox(fd: &mut File) -> Result<i32, NrgError> {
unimplemented!();
}
#[cfg(dead_code)]
fn read_nrg_sinf(fd: &mut File) -> Result<i32, NrgError> {
unimplemented!();
}
#[cfg(dead_code)]
fn read_nrg_mytp(fd: &mut File) -> Result<i32, NrgError> {
unimplemented!();
}

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src/main.rs View File

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use std::env;
use std::process;
extern crate nrgrip;
fn exit_usage(prog_name: &String) {
println!("Usage:\n\t{} <image.nrg>", prog_name);
process::exit(1);
}
fn main() {
let mut argv = env::args();
let prog_name = argv.next().unwrap_or("nrgrip".to_string());
let img_name = argv.next().unwrap_or("".to_string());
if img_name == "" {
exit_usage(&prog_name);
}
println!("NRG image name: {}", img_name);
// We don't support more than one input file
if argv.next().is_some() {
exit_usage(&prog_name);
}
match nrgrip::parse_nrg_metadata(img_name) {
Err(err) => println!("{}", err.to_string()),
Ok(metadata) => println!("\n\
*** Metadata ***\n\
{}", metadata),
};
}

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