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/*
File: file_ape.c
Copyright (C) 2008 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_ape)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_ape(file_stat_t *file_stat);
const file_hint_t file_hint_ape= {
.extension="ape",
.description="Monkey's Audio compressed format",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_ape
};
/* cf https://github.com/fernandotcl/monkeys-audio/blob/master/src/MACLib/APEHeader.h */
struct APE_COMMON_HEADER
{
char cID[4]; /* should equal 'MAC ' */
uint16_t nVersion; /* version number * 1000 (3.81 = 3810) */
};
/*****************************************************************************************
* APE header structure for old APE files (3.97 and earlier)
* *****************************************************************************************/
struct APE_HEADER_OLD
{
char cID[4]; // should equal 'MAC '
uint16_t nVersion; // version number * 1000 (3.81 = 3810)
uint16_t nCompressionLevel; // the compression level
uint16_t nFormatFlags; // any format flags (for future use)
uint16_t nChannels; // the number of channels (1 or 2)
uint32_t nSampleRate; // the sample rate (typically 44100)
uint32_t nHeaderBytes; // the bytes after the MAC header that compose the WAV header
uint32_t nTerminatingBytes; // the bytes after that raw data (for extended info)
uint32_t nTotalFrames; // the number of frames in the file
uint32_t nFinalFrameBlocks; // the number of samples in the final frame
};
/*****************************************************************************************
* APE_DESCRIPTOR structure (file header that describes lengths, offsets, etc.)
* *****************************************************************************************/
struct APE_DESCRIPTOR
{
char cID[4]; // should equal 'MAC '
uint16_t nVersion; // version number * 1000 (3.81 = 3810)
uint16_t pack1;
uint32_t nDescriptorBytes; // the number of descriptor bytes (allows later expansion of this header)
uint32_t nHeaderBytes; // the number of header APE_HEADER bytes
uint32_t nSeekTableBytes; // the number of bytes of the seek table
uint32_t nHeaderDataBytes; // the number of header data bytes (from original file)
uint64_t nAPEFrameDataBytes; // the number of bytes of APE frame data
uint32_t nTerminatingDataBytes; // the terminating data of the file (not including tag data)
uint8_t cFileMD5[16]; // the MD5 hash of the file (see notes for usage... it's a littly tricky)
} __attribute__ ((gcc_struct, __packed__));
/*****************************************************************************************
* APE_HEADER structure (describes the format, duration, etc. of the APE file)
* *****************************************************************************************/
struct APE_HEADER
{
uint16_t nCompressionLevel; // the compression level (see defines I.E. COMPRESSION_LEVEL_FAST)
uint16_t nFormatFlags; // any format flags (for future use)
uint32_t nBlocksPerFrame; // the number of audio blocks in one frame
uint32_t nFinalFrameBlocks; // the number of audio blocks in the final frame
uint32_t nTotalFrames; // the total number of frames
uint16_t nBitsPerSample; // the bits per sample (typically 16)
uint16_t nChannels; // the number of channels (1 or 2)
uint32_t nSampleRate; // the sample rate (typically 44100)
};
/*@
@ requires buffer_size >= sizeof(struct APE_HEADER_OLD);
@ requires separation: \separated(&file_hint_ape, buffer, file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_ape(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
const struct APE_HEADER_OLD *ape=(const struct APE_HEADER_OLD*)buffer;
/* Version 3.96 released April 7, 2002, Version 4.06 March 17, 2009 */
if(le16(ape->nVersion)>=3980)
{
const struct APE_DESCRIPTOR *descr=(const struct APE_DESCRIPTOR*)buffer;
const unsigned int nDescriptorBytes=le32(descr->nDescriptorBytes);
if(nDescriptorBytes < sizeof(struct APE_DESCRIPTOR))
return 0;
if(le32(descr->nHeaderDataBytes) > 0 && le32(descr->nHeaderDataBytes) < sizeof(struct APE_HEADER))
return 0;
if(nDescriptorBytes >= buffer_size)
return 0;
if(nDescriptorBytes + sizeof(struct APE_HEADER) >= buffer_size)
return 0;
{
const struct APE_HEADER *apeh=(const struct APE_HEADER*)&buffer[nDescriptorBytes];
/*@ assert \valid_read(apeh); */
if(le16(apeh->nChannels)<1 || le16(apeh->nChannels)>2)
return 0;
}
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_ape.extension;
return 1;
}
if(le16(ape->nChannels)<1 || le16(ape->nChannels)>2)
return 0;
if(le32(ape->nSampleRate)==0)
return 0;
if(le32(ape->nTotalFrames)==0)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_ape.extension;
/* 4 + le32(ape->nHeaderBytes) + le32(ape->nTerminatingDataBytes) ? */
return 1;
}
static void register_header_check_ape(file_stat_t *file_stat)
{
static const unsigned char ape_header[4]= { 'M', 'A', 'C', ' '};
register_header_check(0, ape_header,sizeof(ape_header), &header_check_ape, file_stat);
}
#endif
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