digest.h Source File

00001 // Copyright (C) 1999-2000 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_THREAD_H__
00045 #include <cc++/thread.h>
00046 #else
00047 #ifdef  __CCXX_NAMESPACE_H__
00048 #include <cc++/macros.h>
00049 #endif
00050 #endif
00051 
00052 #include <iostream.h>
00053 #include <fstream.h>
00054 #include <strstream.h>
00055 
00063 #if defined(STLPORT) || defined(__KCC)
00064 #define ostream ostream_withassign
00065 #endif
00066 class Digest : public streambuf, public ostream
00067 {
00068 protected:
00069         Digest();
00070 
00074         virtual void initDigest(void) = 0;
00075 
00081         virtual unsigned getSize(void) = 0;
00082 
00089         virtual unsigned getDigest(unsigned char *buffer) = 0;
00090 
00097         virtual void putDigest(unsigned char *buffer, unsigned length) = 0;
00098 
00104         virtual ostream &strDigest(ostream &os) = 0;
00105 
00106         friend ostream &operator<<(ostream &os, Digest &ia)
00107                 {return ia.strDigest(os);};
00108 };
00109 
00116 class ChecksumDigest : public Digest
00117 {
00118 protected:
00119         unsigned char csum;
00120 
00121         int overflow(int c);
00122 
00123         ostream &strDigest(ostream &os);
00124 
00125 public:
00126         ChecksumDigest();
00127 
00128         void initDigest(void)
00129                 {csum = 0;};
00130 
00131         unsigned getSize(void)
00132                 {return 1;};
00133 
00134         unsigned getDigest(unsigned char *buffer);
00135 
00136         void putDigest(unsigned char *buffer, unsigned length);
00137 };
00138 
00145 class CRC16Digest : public Digest
00146 {
00147 protected:
00148         unsigned short crc16;
00149 
00150         int overflow(int c);
00151 
00152         ostream &strDigest(ostream &os);
00153 
00154 public:
00155         CRC16Digest();
00156 
00157         void initDigest(void)
00158                 {crc16 = 0;};
00159 
00160         unsigned getSize(void)
00161                 {return 2;};
00162 
00163         unsigned getDigest(unsigned char *buffer);
00164 
00165         void putDigest(unsigned char *buffer, unsigned length);
00166 };
00167 
00168 #ifdef  __CCXX_NAMESPACE_H__
00169 #undef  __CCXX_NAMESPACE_H__
00170 #include <cc++/namespace.h>
00171 #endif
00172 
00173 #endif
00174