1 /*
2
3 File: file_wv.c
4
5 Copyright (C) 2008 Christophe GRENIER <grenier@cgsecurity.org>
6
7 This software is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write the Free Software Foundation, Inc., 51
19 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20
21 */
22
23 #ifdef HAVE_CONFIG_H
24 #include <config.h>
25 #endif
26 #ifdef HAVE_STRING_H
27 #include <string.h>
28 #endif
29 #include <stdio.h>
30 #include "types.h"
31 #include "filegen.h"
32 #include "common.h"
33
34 static void register_header_check_wv(file_stat_t *file_stat);
35 static data_check_t data_check_wv(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
36
37 const file_hint_t file_hint_wv= {
38 .extension="wv",
39 .description="WavPack, Hybrid Lossless Wavefile Compressor",
40 .max_filesize=100*1024*1024,
41 .recover=1,
42 .enable_by_default=1,
43 .register_header_check=®ister_header_check_wv
44 };
45
46 /* See http://www.wavpack.com/file_format.txt for file format description */
47
48 static const unsigned char wv_header[4]= { 'w', 'v', 'p', 'k'};
49 typedef struct {
50 char ckID [4]; // "wvpk"
51 uint32_t ckSize; // size of entire block (minus 8, of course)
52 uint16_t version; // 0x402 to 0x410 are currently valid for decode
53 unsigned char track_no; // track number (0 if not used, like now)
54 unsigned char index_no; // track sub-index (0 if not used, like now)
55 uint32_t total_samples; // total samples for entire file, but this is
56 // only valid if block_index == 0 and a value of
57 // -1 indicates unknown length
58 uint32_t block_index; // index of first sample in block relative to
59 // beginning of file (normally this would start
60 // at 0 for the first block)
61 uint32_t block_samples; // number of samples in this block (0 = no audio)
62 uint32_t flags; // various flags for id and decoding
63 uint32_t crc; // crc for actual decoded data
64 } WavpackHeader;
65
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)66 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)
67 {
68 const WavpackHeader *wv=(const WavpackHeader*)buffer;
69 if(le32(wv->block_index)!=0)
70 return 0;
71 if(sizeof(WavpackHeader) > le32(wv->ckSize)+8)
72 return 0;
73 reset_file_recovery(file_recovery_new);
74 file_recovery_new->extension=file_hint_wv.extension;
75 file_recovery_new->min_filesize=le32(wv->ckSize)+8;
76 if(file_recovery_new->blocksize < 8)
77 return 1;
78 file_recovery_new->data_check=&data_check_wv;
79 file_recovery_new->file_check=&file_check_size;
80 return 1;
81 }
82
data_check_wv(const unsigned char * buffer,const unsigned int buffer_size,file_recovery_t * file_recovery)83 static data_check_t data_check_wv(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
84 {
85 while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
86 file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
87 {
88 const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
89 const WavpackHeader *wv=(const WavpackHeader*)&buffer[i];
90 if(memcmp(wv, wv_header, sizeof(wv_header))==0)
91 {
92 file_recovery->calculated_file_size+=(uint64_t)8+le32(wv->ckSize);
93 }
94 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')
95 { /* APE Tagv2 (APE Tagv1 has no header) http://wiki.hydrogenaudio.org/index.php?title=APE_Tags_Header */
96 const unsigned int ape_tag_size = (buffer[i+12] + (buffer[i+13]<<8) + (buffer[i+14]<<16) + (buffer[i+15]<<24))+32;
97 file_recovery->calculated_file_size+=ape_tag_size;
98 }
99 else if(buffer[i]=='T' && buffer[i+1]=='A' && buffer[i+2]=='G')
100 { /* http://www.id3.org/ID3v1 TAGv1 size = 128 bytes with header "TAG" */
101 file_recovery->calculated_file_size+=128;
102 }
103 else if(file_recovery->calculated_file_size > file_recovery->file_size)
104 {
105 return DC_CONTINUE;
106 }
107 else
108 {
109 return DC_STOP;
110 }
111 }
112 return DC_CONTINUE;
113 }
114
register_header_check_wv(file_stat_t * file_stat)115 static void register_header_check_wv(file_stat_t *file_stat)
116 {
117 register_header_check(0, wv_header, sizeof(wv_header), &header_check_wv, file_stat);
118 }
119