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/*
File: file_wv.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_wv)
#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_wv(file_stat_t *file_stat);
const file_hint_t file_hint_wv = {
.extension = "wv",
.description = "WavPack, Hybrid Lossless Wavefile Compressor",
.max_filesize = 100 * 1024 * 1024,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_wv
};
/* See http://www.wavpack.com/file_format.txt for file format description */
static const unsigned char wv_header[4] = { 'w', 'v', 'p', 'k' };
typedef struct
{
char ckID[4]; // "wvpk"
uint32_t ckSize; // size of entire block (minus 8, of course)
uint16_t version; // 0x402 to 0x410 are currently valid for decode
unsigned char track_no; // track number (0 if not used, like now)
unsigned char index_no; // track sub-index (0 if not used, like now)
uint32_t total_samples; // total samples for entire file, but this is
// only valid if block_index == 0 and a value of
// -1 indicates unknown length
uint32_t block_index; // index of first sample in block relative to
// beginning of file (normally this would start
// at 0 for the first block)
uint32_t block_samples; // number of samples in this block (0 = no audio)
uint32_t flags; // various flags for id and decoding
uint32_t crc; // crc for actual decoded data
} WavpackHeader;
/*@
@ requires file_recovery->data_check==&data_check_wv;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_wv(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size / 2 - (file_recovery->calculated_file_size + 16);
@*/
while(file_recovery->calculated_file_size + buffer_size / 2 >= file_recovery->file_size && file_recovery->calculated_file_size + 16 <= file_recovery->file_size + buffer_size / 2)
{
const unsigned int i = file_recovery->calculated_file_size + buffer_size / 2 - file_recovery->file_size;
/*@ assert 0 <= i <= buffer_size - 16; */
const WavpackHeader *wv = (const WavpackHeader *)&buffer[i];
if(memcmp(wv, wv_header, sizeof(wv_header)) == 0)
{
file_recovery->calculated_file_size += (uint64_t)8 + le32(wv->ckSize);
}
else if(buffer[i] == 'A' && buffer[i + 1] == 'P' && buffer[i + 2] == 'E' && buffer[i + 3] == 'T' && buffer[i + 4] == 'A' && buffer[i + 5] == 'G' && buffer[i + 6] == 'E' && buffer[i + 7] == 'X')
{ /* APE Tagv2 (APE Tagv1 has no header) http://wiki.hydrogenaudio.org/index.php?title=APE_Tags_Header */
const uint64_t ape_tag_size = (buffer[i + 12] + (buffer[i + 13] << 8) + (buffer[i + 14] << 16) + ((uint64_t)buffer[i + 15] << 24)) + 32;
/*@ assert ape_tag_size > 0; */
file_recovery->calculated_file_size += ape_tag_size;
}
else if(buffer[i] == 'T' && buffer[i + 1] == 'A' && buffer[i + 2] == 'G')
{ /* http://www.id3.org/ID3v1 TAGv1 size = 128 bytes with header "TAG" */
file_recovery->calculated_file_size += 128;
}
else if(file_recovery->calculated_file_size > file_recovery->file_size)
{
return DC_CONTINUE;
}
else
{
return DC_STOP;
}
}
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= sizeof(WavpackHeader);
@ requires separation: \separated(&file_hint_wv, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_wv(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 WavpackHeader *wv = (const WavpackHeader *)buffer;
const uint32_t ckSize = le32(wv->ckSize);
if(le32(wv->block_index) != 0)
return 0;
if(sizeof(WavpackHeader) > (uint64_t)ckSize + 8)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_wv.extension;
file_recovery_new->min_filesize = (uint64_t)ckSize + 8;
if(file_recovery_new->blocksize < 8)
return 1;
file_recovery_new->data_check = &data_check_wv;
file_recovery_new->file_check = &file_check_size;
return 1;
}
static void register_header_check_wv(file_stat_t *file_stat)
{
register_header_check(0, wv_header, sizeof(wv_header), &header_check_wv, file_stat);
}
#endif
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