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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.
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00037 // If you write modifications of your own for Common C++, it is your choice
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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>
00053 #include <fstream>
00054 #include <strstream>
00055 
00056 
00064 #if defined(STLPORT) || defined(__KCC)
00065 #define std::ostream std::ostream_withassign
00066 #endif
00067 class Digest : public std::streambuf, public std::ostream
00068 {
00069 protected:
00070         Digest();
00071 
00075         virtual void initDigest(void) = 0;
00076 
00082         virtual unsigned getSize(void) = 0;
00083 
00090         virtual unsigned getDigest(unsigned char *buffer) = 0;
00091 
00098         virtual void putDigest(unsigned char *buffer, unsigned length) = 0;
00099 
00105         virtual std::ostream &strDigest(std::ostream &os) = 0;
00106 
00107         friend std::ostream &operator<<(std::ostream &os, Digest &ia)
00108                 {return ia.strDigest(os);};
00109 };
00110 
00117 class ChecksumDigest : public Digest
00118 {
00119 protected:
00120         unsigned char csum;
00121 
00122         int overflow(int c);
00123 
00124         std::ostream &strDigest(std::ostream &os);
00125 
00126 public:
00127         ChecksumDigest();
00128 
00129         void initDigest(void)
00130                 {csum = 0;};
00131 
00132         unsigned getSize(void)
00133                 {return 1;};
00134 
00135         unsigned getDigest(unsigned char *buffer);
00136 
00137         void putDigest(unsigned char *buffer, unsigned length);
00138 };
00139 
00146 class CRC16Digest : public Digest
00147 {
00148 protected:
00149         unsigned short crc16;
00150 
00151         int overflow(int c);
00152 
00153         std::ostream &strDigest(std::ostream &os);
00154 
00155 public:
00156         CRC16Digest();
00157 
00158         void initDigest(void)
00159                 {crc16 = 0;};
00160 
00161         unsigned getSize(void)
00162                 {return 2;};
00163 
00164         unsigned getDigest(unsigned char *buffer);
00165 
00166         void putDigest(unsigned char *buffer, unsigned length);
00167 };
00168 
00169 #ifdef  __CCXX_NAMESPACE_H__
00170 #undef  __CCXX_NAMESPACE_H__
00171 #include <cc++/namespace.h>
00172 #endif
00173 
00174 #endif
00175 

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