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digest.h

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// Copyright (C) 1999-2001 Open Source Telecom Corporation.
//  
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software 
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// As a special exception to the GNU General Public License, permission is 
// granted for additional uses of the text contained in its release 
// of Common C++.
// 
// The exception is that, if you link the Common C++ library with other
// files to produce an executable, this does not by itself cause the
// resulting executable to be covered by the GNU General Public License.
// Your use of that executable is in no way restricted on account of
// linking the Common C++ library code into it.
// 
// This exception does not however invalidate any other reasons why
// the executable file might be covered by the GNU General Public License.
// 
// This exception applies only to the code released under the 
// name Common C++.  If you copy code from other releases into a copy of
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
// 
// If you write modifications of your own for Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.  

#ifndef __CCXX_DIGEST_H__
#define __CCXX_DIGEST_H__

#ifndef __CCXX_CONFIG_H__
#include <cc++/config.h>
#endif

#ifndef __CCXX_THREAD_H__
#include <cc++/thread.h>
#endif

#include <iostream>
#include <fstream>
#include <strstream>

#ifdef  __NAMESPACES__
namespace ost {
#endif

#ifdef WIN32
class CCXX_CLASS_EXPORT Digest;
class CCXX_CLASS_EXPORT ChecksumDigest;
class CCXX_CLASS_EXPORT CRC16Digest;
#endif

#if defined(STLPORT) || defined(__KCC)
#define std::ostream std::ostream_withassign
#endif
class Digest : public std::streambuf, public std::ostream
{
protected:
        Digest();

        virtual void initDigest(void) = 0;

        virtual unsigned getSize(void) = 0;

        virtual unsigned getDigest(unsigned char *buffer) = 0;

        virtual void putDigest(unsigned char *buffer, unsigned length) = 0;

        virtual std::ostream &strDigest(std::ostream &os) = 0;

        friend std::ostream &operator<<(std::ostream &os, Digest &ia)
                {return ia.strDigest(os);};
};

class ChecksumDigest : public Digest
{
protected:
        unsigned char csum;

        int overflow(int c);

        std::ostream &strDigest(std::ostream &os);

public:
        ChecksumDigest();

        void initDigest(void)
                {csum = 0;};

        unsigned getSize(void)
                {return 1;};

        unsigned getDigest(unsigned char *buffer);

        void putDigest(unsigned char *buffer, unsigned length);
};

class CRC16Digest : public Digest
{
protected:
        unsigned short crc16;

        int overflow(int c);

        std::ostream &strDigest(std::ostream &os);

public:
        CRC16Digest();

        void initDigest(void)
                {crc16 = 0;};

        unsigned getSize(void)
                {return 2;};

        unsigned getDigest(unsigned char *buffer);

        void putDigest(unsigned char *buffer, unsigned length);
};

#ifdef  __NAMESPACES__
};
#endif

#endif

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