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Compress.hpp

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(c) AT&T Corp. All rights reserved.  AT&T is a registered trademark of AT&T Corp.

***********************************************************************

History:

      24/11/99  - initial release by Hartmut Liefke, liefke@seas.upenn.edu
                                     Dan Suciu,      suciu@research.att.com
*/

//**************************************************************************
//**************************************************************************

// This module implements 'Compressor' and 'Uncompressor' -
// the interfaces to the ZLIB (either gzip or bzip) libary


#ifndef COMPRESS_HPP
#define COMPRESS_HPP

#ifdef USE_BZIP
#include <bzlib.h>
#else
#include <zlib.h>
#endif

class Output;
class MemStreamer;
class Input;

//************************************************************************

// The Compressor

#ifdef XMILL

class Compressor
{
   // We store the state for the zlib compressor
#ifdef USE_BZIP
   bz_stream      state;
#else
   z_stream       state;
#endif
   Output         *output;
   unsigned char  isinitialized:1;

public:
   Compressor(Output *myoutput);
   ~Compressor();
   void CompressMemStream(MemStreamer *memstream);
      // Reads the data from 'memstream' and sends
      // it to the compressor

   void CompressData(unsigned char *ptr,unsigned len);
      // Compresses the data at position 'ptr' of length 'len'

   void FinishCompress(unsigned long *uncompressedsize,unsigned long *compressedsize);
      // Finishes the compression and stores the input data size and
      // the output data size in 'uncompressedsize' and 'compressedsize'
};
#endif

//************************************************************************

// The Decompressor

#ifdef XDEMILL

class Uncompressor
{
   // We store the states for the zlib compressor
#ifdef USE_BZIP
   bz_stream      state;
#else
   z_stream       state;
#endif

public:
   unsigned char     isinitialized:1;

public:

   Uncompressor() {  isinitialized=0;  }

   char Uncompress(Input *input,unsigned char *dataptr,unsigned long *len);
      // Decompresses the data from 'input' and stores
      // the result in 'dataptr'. It decompresses at most *len
      // bytes. Afterwards, '*len' is set to the actual number
      // of bytes uncompressed.
      // The function returns 1, if output buffer is full and
      // there is more data to read. Otherwise, the function returns 0.
};
#endif

#endif

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