WPXEncryption.h
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00001 /* libwpd
00002  * Copyright (C) 2007 Jaroslav Fojtik (JaFojtik@seznam.cz)
00003  * Copyright (C) 2007 Fridrich Strba (fridrich.strba@bluewin.ch)
00004  *  
00005  * This library is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU Library General Public
00007  * License as published by the Free Software Foundation; either
00008  * version 2 of the License, or (at your option) any later version.
00009  *
00010  * This library 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 GNU
00013  * Library General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Library General Public
00016  * License along with this library; if not, write to the Free Software
00017  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
00018  *
00019  * For further information visit http://libwpd.sourceforge.net
00020  */
00021 
00022 /* "This product is not manufactured, approved, or supported by 
00023  * Corel Corporation or Corel Corporation Limited."
00024  */
00025 
00026 #ifndef WPXENCRYPTION_H
00027 #define WPXENCRYPTION_H
00028 
00029 #include "libwpd_types.h"
00030 #include "WPXString.h"
00031 
00032 class WPXInputStream;
00033 
00034 class WPXEncryption
00035 {
00036 public:
00037         WPXEncryption(const char *password, const unsigned long encryptionStartOffset = 0);
00038         ~WPXEncryption();
00039         
00040         const unsigned char *readAndDecrypt(WPXInputStream *input, unsigned long numBytes, unsigned long &numBytesRead);
00041         uint16_t getCheckSum() const;
00042         
00043         void setEncryptionStartOffset(unsigned long encryptionStartOffset) { m_encryptionStartOffset = encryptionStartOffset; }
00044         unsigned long getEncryptionStartOffset() const { return m_encryptionStartOffset; }
00045         
00046         void setEncryptionMaskBase(unsigned char encryptionMaskBase) { m_encryptionMaskBase = encryptionMaskBase; }
00047         unsigned char getEncryptionMaskBase() const { return m_encryptionMaskBase; }
00048         
00049         const WPXString& getEncryptionPassword() const { return m_password; }
00050 
00051 private:
00052         unsigned char *m_buffer;
00053         WPXString m_password;
00054         unsigned long m_encryptionStartOffset;
00055         unsigned char m_encryptionMaskBase;
00056 };
00057 
00058 #endif /* WPXENCRYPTION_H */