steghide  0.5.1
WavFile.h
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1 /*
2  * steghide 0.5.1 - a steganography program
3  * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version 2
8  * of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18  *
19  */
20 
21 #ifndef SH_WAVFILE_H
22 #define SH_WAVFILE_H
23 
24 #include <vector>
25 
26 #include "CvrStgFile.h"
27 
28 class BinaryIO ;
29 class WavChunkHeader ;
30 class WavChunkUnused ;
31 class WavFormatChunk ;
32 
33 class WavFile : public CvrStgFile {
34  public:
35  WavFile (void) ;
36  WavFile (BinaryIO *io) ;
37  ~WavFile (void) ;
38 
39  void read (BinaryIO *io) ;
40  void write (void) ;
41 
42  std::list<CvrStgFile::Property> getProperties (void) const ;
43 
44  unsigned long getNumSamples (void) const ;
45  void replaceSample (const SamplePos pos, const SampleValue* s) ;
46  SampleValue* getSampleValue (SamplePos pos) const ;
47 
48  std::vector<SampleValueAdjacencyList*> calcSVAdjacencyLists (const std::vector<SampleValue*>& svs) const ;
49  std::vector<MatchingAlgorithm*> getMatchingAlgorithms (Graph* g, Matching* m) const ;
50 
51  unsigned short getBitsPerSample (void) const ;
52 
53  private:
54  static const signed short FormatPCM = 1 ;
55 
56  static const unsigned short SamplesPerVertex = 2 ;
57  static const UWORD32 Radius_small = 1 ;
58  static const UWORD32 Radius_large = 20 ;
59  static const EmbValue EmbValueModulus = 2 ;
60 
62  char id_wave[4] ;
63 
65 
68  std::vector<unsigned char> data_small ;
70  std::vector<int> data_large ; // it is assumed that an int can hold 32 bits
71 
72  std::vector<WavChunkUnused*> UnusedBeforeData ;
73  std::vector<BYTE> UnusedAfterData ;
74 
75  void readheaders (void) ;
76  void readdata (void) ;
77  void writeheaders (void) ;
78  void writedata (void) ;
79  void calcpos (SamplePos n, unsigned long *bytepos, unsigned short *firstbitpos) const ;
84  unsigned short getFirstBitPosinSample (void) ;
85  unsigned short getBytesPerSample (void) ;
86 } ;
87 
88 #endif // ndef SH_WAVFILE_H