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digest.h

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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 // 
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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.
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00026 // 
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00028 // the executable file might be covered by the GNU General Public License.
00029 // 
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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
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00034 // anyone as to the status of such modified files, you must delete
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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 <fstream.h>
00053 #include <strstream.h>
00054 
00062 class Digest : public streambuf, public ostream
00063 {
00064 protected:
00065         Digest();
00066 
00070         virtual void initDigest(void) = 0;
00071 
00077         virtual unsigned getSize(void) = 0;
00078 
00085         virtual unsigned getDigest(unsigned char *buffer) = 0;
00086 
00093         virtual void putDigest(unsigned char *buffer, unsigned length) = 0;
00094 
00100         virtual ostream &strDigest(ostream &os) = 0;
00101 
00102         friend ostream &operator<<(ostream &os, Digest &ia)
00103                 {return ia.strDigest(os);};
00104 };
00105 
00112 class ChecksumDigest : public Digest
00113 {
00114 protected:
00115         unsigned char csum;
00116 
00117         int overflow(int c);
00118 
00119         ostream &strDigest(ostream &os);
00120 
00121 public:
00122         ChecksumDigest();
00123 
00124         void initDigest(void)
00125                 {csum = 0;};
00126 
00127         unsigned getSize(void)
00128                 {return 1;};
00129 
00130         unsigned getDigest(unsigned char *buffer);
00131 
00132         void putDigest(unsigned char *buffer, unsigned length);
00133 };
00134 
00141 class CRC16Digest : public Digest
00142 {
00143 protected:
00144         unsigned short crc16;
00145 
00146         int overflow(int c);
00147 
00148         ostream &strDigest(ostream &os);
00149 
00150 public:
00151         CRC16Digest();
00152 
00153         void initDigest(void)
00154                 {crc16 = 0;};
00155 
00156         unsigned getSize(void)
00157                 {return 2;};
00158 
00159         unsigned getDigest(unsigned char *buffer);
00160 
00161         void putDigest(unsigned char *buffer, unsigned length);
00162 };
00163 
00164 #ifdef  __CCXX_NAMESPACE_H__
00165 #undef  __CCXX_NAMESPACE_H__
00166 #include <cc++/namespace.h>
00167 #endif
00168 
00169 #endif
00170 

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