109 lines
3.9 KiB
Rust
109 lines
3.9 KiB
Rust
// This file is part of the NRGrip project.
|
|
//
|
|
// Copyright (c) 2016 Matteo Cypriani <mcy@lm7.fr>
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to
|
|
// deal in the Software without restriction, including without limitation the
|
|
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
// sell copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
// IN THE SOFTWARE.
|
|
|
|
//! Module to extract the raw audio data from an NRG image file.
|
|
|
|
use std::fs::File;
|
|
use std::io::{Seek, SeekFrom, Read, Write};
|
|
use std::path::PathBuf;
|
|
|
|
use ::error::NrgError;
|
|
use ::metadata::metadata::NrgMetadata;
|
|
|
|
|
|
/// Extracts the raw audio data from an NRG image.
|
|
///
|
|
/// - `in_fd` is the handler to the NRG image file.
|
|
/// - `img_path` is the name of the input NRG file.
|
|
/// - `metadata` is the metadata extracted from `img_path` by nrgrip::metadata.
|
|
///
|
|
/// The output file's name is derived from `img_path`.
|
|
pub fn extract_nrg_raw_audio(in_fd: &mut File,
|
|
img_path: &String,
|
|
metadata: &NrgMetadata)
|
|
-> Result<(), NrgError> {
|
|
const BUF_SIZE: usize = 1024 * 1024 * 4; // 4 MiB
|
|
|
|
// Seek to the first audio byte
|
|
let first_audio_byte = metadata.first_audio_byte();
|
|
try!(in_fd.seek(SeekFrom::Start(first_audio_byte)));
|
|
|
|
// Get the last audio byte
|
|
let last_audio_byte = metadata.last_audio_byte();
|
|
|
|
// Open output file
|
|
let audio_name = try!(make_output_file_name(img_path));
|
|
let mut out_fd = try!(File::create(audio_name));
|
|
|
|
// Read/write audio data
|
|
let mut cur_offset = first_audio_byte;
|
|
while cur_offset + BUF_SIZE as u64 <= last_audio_byte {
|
|
let mut audio_buf = [0u8; BUF_SIZE];
|
|
|
|
let mut nbytes = try!(in_fd.read(&mut audio_buf));
|
|
if nbytes != BUF_SIZE {
|
|
return Err(NrgError::AudioReadError);
|
|
}
|
|
cur_offset += nbytes as u64;
|
|
|
|
nbytes = try!(out_fd.write(&audio_buf));
|
|
if nbytes != BUF_SIZE {
|
|
return Err(NrgError::AudioWriteError);
|
|
}
|
|
}
|
|
|
|
// Read/write the last bytes
|
|
let remaining: usize = (last_audio_byte - cur_offset) as usize;
|
|
let mut audio_buf = vec![0u8; remaining];
|
|
let mut nbytes = try!(in_fd.read(&mut audio_buf));
|
|
if nbytes != remaining {
|
|
return Err(NrgError::AudioReadError);
|
|
}
|
|
cur_offset += nbytes as u64;
|
|
nbytes = try!(out_fd.write(&audio_buf));
|
|
if nbytes != remaining {
|
|
return Err(NrgError::AudioWriteError);
|
|
}
|
|
|
|
assert_eq!(cur_offset, last_audio_byte);
|
|
Ok(())
|
|
}
|
|
|
|
|
|
/// Generates the output file's name from the NRG image's name.
|
|
///
|
|
/// The output file's name will be `img_path`'s base name stripped for its
|
|
/// extension (if any), with a ".raw" extension.
|
|
fn make_output_file_name(img_path: &String) -> Result<String, NrgError> {
|
|
let mut name = PathBuf::from(img_path);
|
|
name.set_extension("raw");
|
|
let name = PathBuf::from(name);
|
|
let name = try!(name.file_name().ok_or(NrgError::FileName));
|
|
|
|
// Make sure the new name and the original name are different
|
|
if name == img_path.as_str() {
|
|
return Err(NrgError::FileName);
|
|
}
|
|
|
|
Ok(name.to_string_lossy().into_owned())
|
|
}
|