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