JpegFile.h

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00001 /*
00002  * steghide 0.5.1 - a steganography program
00003  * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
00004  *
00005  * This program is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU General Public License
00007  * as published by the Free Software Foundation; either version 2
00008  * of the License, or (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00018  *
00019  */
00020 
00021 #ifndef SH_JPEGFILE_H
00022 #define SH_JPEGFILE_H
00023 
00024 #include "common.h"
00025 
00026 #ifdef USE_LIBJPEG
00027 
00028 #include <vector>
00029 
00030 extern "C" {
00031 #include <stdio.h>
00032 #include <jpeglib.h>
00033 }
00034 
00035 class BinaryIO ;
00036 #include "CvrStgFile.h"
00037 class SampleValue ;
00038 
00045 class JpegFile : public CvrStgFile {
00046         public:
00047         JpegFile (BinaryIO* io) ;
00048         ~JpegFile (void) ;
00049 
00050         void read (BinaryIO* io) ;
00051         void write (void) ;
00052 
00053         std::list<CvrStgFile::Property> getProperties (void) const ;
00054         std::vector<MatchingAlgorithm*> getMatchingAlgorithms (Graph* g, Matching* m) const ;
00055         
00056         unsigned long getNumSamples (void) const ;
00057         void replaceSample (const SamplePos pos, const SampleValue* s) ;
00058         SampleValue* getSampleValue (const SamplePos pos) const ;
00059         EmbValue getEmbeddedValue (const SamplePos pos) const ;
00060 
00061 #ifdef DEBUG
00062         std::map<SampleKey,unsigned long>* getFrequencies (void) ;
00069         void printFrequencies (const std::map<SampleKey,unsigned long>& freqs) ;
00070 #endif
00071 
00072         private:
00074         static const unsigned int CoeffPerBlock = 64 ;
00075 
00076         static const unsigned short SamplesPerVertex = 3 ;
00077         static const UWORD32 Radius = 1 ;
00078         static const EmbValue EmbValueModulus = 2 ;
00079 
00080         struct jpeg_compress_struct CInfo ;
00081         struct jpeg_decompress_struct DeCInfo ;
00082         unsigned int* HeightInBlocks ;
00083         unsigned int* WidthInBlocks ;
00084         jvirt_barray_ptr* DctCoeffs ;
00085 
00086         std::vector<SWORD16> LinDctCoeffs ;
00087         std::vector<UWORD32> StegoIndices ;
00088 } ;
00089 
00090 #endif // def USE_LIBJPEG
00091 
00092 #endif // ndef SH_JPEGFILE_H

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