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digest.h

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00001 // Copyright (C) 1999-2001 Open Source Telecom Corporation.
00002 //  
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 // 
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 // 
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software 
00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00016 // 
00017 // As a special exception to the GNU General Public License, permission is 
00018 // granted for additional uses of the text contained in its release 
00019 // of Common C++.
00020 // 
00021 // The exception is that, if you link the Common C++ library with other
00022 // files to produce an executable, this does not by itself cause the
00023 // resulting executable to be covered by the GNU General Public License.
00024 // Your use of that executable is in no way restricted on account of
00025 // linking the Common C++ library code into it.
00026 // 
00027 // This exception does not however invalidate any other reasons why
00028 // the executable file might be covered by the GNU General Public License.
00029 // 
00030 // This exception applies only to the code released under the 
00031 // name Common C++.  If you copy code from other releases into a copy of
00032 // Common C++, as the General Public License permits, the exception does
00033 // not apply to the code that you add in this way.  To avoid misleading
00034 // anyone as to the status of such modified files, you must delete
00035 // this exception notice from them.
00036 // 
00037 // If you write modifications of your own for Common C++, it is your choice
00038 // whether to permit this exception to apply to your modifications.
00039 // If you do not wish that, delete this exception notice.  
00040 
00041 #ifndef __CCXX_DIGEST_H__
00042 #define __CCXX_DIGEST_H__
00043 
00044 #ifndef __CCXX_CONFIG_H__
00045 #include <cc++/config.h>
00046 #endif
00047 
00048 #ifndef __CCXX_THREAD_H__
00049 #include <cc++/thread.h>
00050 #endif
00051 
00052 #include <iostream>
00053 #include <fstream>
00054 #include <strstream>
00055 
00056 #ifdef  __NAMESPACES__
00057 namespace ost {
00058 #endif
00059 
00067 #if defined(STLPORT) || defined(__KCC)
00068 #define std::ostream std::ostream_withassign
00069 #endif
00070 class Digest : public std::streambuf, public std::ostream
00071 {
00072 protected:
00073         Digest();
00074 
00078         virtual void initDigest(void) = 0;
00079 
00085         virtual unsigned getSize(void) = 0;
00086 
00093         virtual unsigned getDigest(unsigned char *buffer) = 0;
00094 
00101         virtual void putDigest(unsigned char *buffer, unsigned length) = 0;
00102 
00108         virtual std::ostream &strDigest(std::ostream &os) = 0;
00109 
00110         friend std::ostream &operator<<(std::ostream &os, Digest &ia)
00111                 {return ia.strDigest(os);};
00112 };
00113 
00120 class ChecksumDigest : public Digest
00121 {
00122 protected:
00123         unsigned char csum;
00124 
00125         int overflow(int c);
00126 
00127         std::ostream &strDigest(std::ostream &os);
00128 
00129 public:
00130         ChecksumDigest();
00131 
00132         void initDigest(void)
00133                 {csum = 0;};
00134 
00135         unsigned getSize(void)
00136                 {return 1;};
00137 
00138         unsigned getDigest(unsigned char *buffer);
00139 
00140         void putDigest(unsigned char *buffer, unsigned length);
00141 };
00142 
00149 class CRC16Digest : public Digest
00150 {
00151 protected:
00152         unsigned short crc16;
00153 
00154         int overflow(int c);
00155 
00156         std::ostream &strDigest(std::ostream &os);
00157 
00158 public:
00159         CRC16Digest();
00160 
00161         void initDigest(void)
00162                 {crc16 = 0;};
00163 
00164         unsigned getSize(void)
00165                 {return 2;};
00166 
00167         unsigned getDigest(unsigned char *buffer);
00168 
00169         void putDigest(unsigned char *buffer, unsigned length);
00170 };
00171 
00172 #ifdef  __NAMESPACES__
00173 };
00174 #endif
00175 
00176 #endif
00177 

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