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EmbData.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_EMBDATA_H
00022 #define SH_EMBDATA_H
00023 
00024 #include <string>
00025 #include <vector>
00026 
00027 #include "common.h"
00028 
00029 #include "BitString.h"
00030 #include "EncryptionAlgorithm.h"
00031 #include "EncryptionMode.h"
00032 
00033 class EmbData {
00034         public:
00035         enum MODE { EMBED, EXTRACT } ;
00036         enum STATE { READ_MAGIC, READ_VERSION, READ_ENCINFO, READ_NPLAINBITS, READ_ENCRYPTED, END } ;
00037 
00044         EmbData (MODE m, std::string pp, std::string fn = "") ;
00045 
00046         BitString getBitString (void) ;
00047 
00048         bool finished (void) ;
00049 
00053         unsigned long getNumBitsRequested (void) ;
00054 
00055         void addBits (BitString addbits) ;
00056 
00057         void setEncAlgo (EncryptionAlgorithm a) ;
00058         EncryptionAlgorithm getEncAlgo (void) const ;
00059         
00060         void setEncMode (EncryptionMode m) ;
00061         EncryptionMode getEncMode (void) const ;
00062 
00063         void setCompression (int c) ;
00064         int getCompression (void) const ;
00065 
00066         void setChecksum (bool c) ;
00067         bool getChecksum (void) const ;
00068 
00073         bool checksumOK (void) const ;
00074 
00075         void setData (const std::vector<BYTE> data)
00076                 { Data = data ; } ;
00077 
00078         std::vector<BYTE> getData (void) const
00079                 { return Data ; } ;
00080 
00081         std::string getFileName (void) const
00082                 { return FileName ; } ;
00083 
00085         static const unsigned int MinStegoHeaderSize = 50 ;
00086 
00087         protected:
00088         std::string stripDir (std::string s) ;
00089 
00090         private:
00092         static const unsigned int NBitsNPlainBits = 32 ;
00094         static const unsigned int NBitsNUncompressedBits = 32 ;
00096         static const unsigned int NBitsCrc32 = 32 ;
00098         static const unsigned short CodeVersion = 0 ;
00100         static const UWORD32 Magic = 0x73688DUL ;
00102         static const unsigned int NBitsMagic = 24 ;
00103 
00104         MODE Mode ;
00105         STATE State ;
00106         
00107         unsigned long NPlainBits ;
00108 
00110         unsigned long NumBitsRequested ;
00112         unsigned long NumBitsNeeded ;
00113 
00114         BitString Reservoir ;
00115 
00116         std::string Passphrase ;
00117 
00119         unsigned short Version ;
00120 
00121         EncryptionAlgorithm EncAlgo ;
00122         EncryptionMode EncMode ;
00124         int Compression ;
00126         bool Checksum ;
00128         unsigned long CRC32 ;
00129         std::string FileName ;
00131         std::vector<BYTE> Data ;
00132 } ;
00133 
00134 #endif // ndef SH_EMBDATA_H

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