WPXEncryption.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
00002 /* libwpd
00003  * Copyright (C) 2007 Jaroslav Fojtik (JaFojtik@seznam.cz)
00004  * Copyright (C) 2007 Fridrich Strba (fridrich.strba@bluewin.ch)
00005  *
00006  * This library is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Library General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2 of the License, or (at your option) any later version.
00010  *
00011  * This library is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Library General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Library General Public
00017  * License along with this library; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
00019  *
00020  * For further information visit http://libwpd.sourceforge.net
00021  */
00022 
00023 /* "This product is not manufactured, approved, or supported by
00024  * Corel Corporation or Corel Corporation Limited."
00025  */
00026 
00027 #ifndef WPXENCRYPTION_H
00028 #define WPXENCRYPTION_H
00029 
00030 #include "libwpd_types.h"
00031 #include "WPXString.h"
00032 
00033 class WPXInputStream;
00034 
00035 class WPXEncryption
00036 {
00037 public:
00038         WPXEncryption(const char *password, const unsigned long encryptionStartOffset = 0);
00039         ~WPXEncryption();
00040 
00041         const unsigned char *readAndDecrypt(WPXInputStream *input, unsigned long numBytes, unsigned long &numBytesRead);
00042         uint16_t getCheckSum() const;
00043 
00044         void setEncryptionStartOffset(unsigned long encryptionStartOffset)
00045         {
00046                 m_encryptionStartOffset = encryptionStartOffset;
00047         }
00048         unsigned long getEncryptionStartOffset() const
00049         {
00050                 return m_encryptionStartOffset;
00051         }
00052 
00053         void setEncryptionMaskBase(unsigned char encryptionMaskBase)
00054         {
00055                 m_encryptionMaskBase = encryptionMaskBase;
00056         }
00057         unsigned char getEncryptionMaskBase() const
00058         {
00059                 return m_encryptionMaskBase;
00060         }
00061 
00062         const WPXString &getEncryptionPassword() const
00063         {
00064                 return m_password;
00065         }
00066 
00067 private:
00068         unsigned char *m_buffer;
00069         WPXString m_password;
00070         unsigned long m_encryptionStartOffset;
00071         unsigned char m_encryptionMaskBase;
00072         // Unimplemented to prevent compiler from creating crasher ones
00073         WPXEncryption(const WPXEncryption &);
00074         WPXEncryption &operator=(const WPXEncryption &);
00075 };
00076 
00077 #endif /* WPXENCRYPTION_H */
00078 /* vim:set shiftwidth=4 softtabstop=4 noexpandtab: */