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/*
* Copyright (C) 2007-2023 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/deflate.h"
#include "bu/trace.h"
#include <zlib.h>
#define pState ((z_stream *)prState)
using namespace Bu;
Bu::Deflate::Deflate( Bu::Stream &rNext, int nCompression, Format eFmt ) :
Bu::Filter( rNext ),
prState( NULL ),
nCompression( nCompression ),
sTotalOut( 0 ),
eFmt( eFmt ),
bEos( false )
{
TRACE( nCompression );
start();
}
Bu::Deflate::~Deflate()
{
TRACE();
stop();
}
void Bu::Deflate::start()
{
TRACE();
prState = new z_stream;
pState->zalloc = NULL;
pState->zfree = NULL;
pState->opaque = NULL;
pState->state = NULL;
nBufSize = 64*1024;
pBuf = new char[nBufSize];
}
Bu::size Bu::Deflate::stop()
{
TRACE();
if( pState && pState->state )
{
if( bReading )
{
inflateEnd( pState );
delete[] pBuf;
pBuf = NULL;
delete pState;
prState = NULL;
return 0;
}
else
{
for(;;)
{
pState->next_in = NULL;
pState->avail_in = 0;
pState->avail_out = nBufSize;
pState->next_out = (Bytef *)pBuf;
int res = deflate( pState, Z_FINISH );
if( pState->avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-pState->avail_out );
}
if( res == Z_STREAM_END )
break;
}
deflateEnd( pState );
delete[] pBuf;
pBuf = NULL;
delete pState;
prState = NULL;
return sTotalOut;
}
}
return 0;
}
void Bu::Deflate::zError( int code )
{
TRACE( code );
switch( code )
{
case Z_OK:
case Z_STREAM_END:
case Z_NEED_DICT:
return;
case Z_ERRNO:
throw ExceptionBase("Deflate: Errno - %s", pState->msg );
case Z_STREAM_ERROR:
throw ExceptionBase("Deflate: Stream Error - %s", pState->msg );
case Z_DATA_ERROR:
throw ExceptionBase("Deflate: Data Error - %s", pState->msg );
case Z_MEM_ERROR:
throw ExceptionBase("Deflate: Mem Error - %s", pState->msg );
case Z_BUF_ERROR:
throw ExceptionBase("Deflate: Buf Error - %s", pState->msg );
case Z_VERSION_ERROR:
throw ExceptionBase("Deflate: Version Error - %s", pState->msg );
default:
throw ExceptionBase("Deflate: Unknown error encountered - %s.", pState->msg );
}
}
Bu::size Bu::Deflate::read( void *pData, Bu::size nBytes )
{
TRACE( pData, nBytes );
if( nBytes <= 0 )
return 0;
if( !pState->state )
{
bReading = true;
if( eFmt&AutoDetect )
inflateInit2( pState, 32+15 ); // Auto-detect, large window
else if( eFmt == Raw )
inflateInit2( pState, -15 ); // Raw
else if( eFmt == Zlib )
inflateInit2( pState, 15 ); // Zlib
else if( eFmt == Gzip )
inflateInit2( pState, 16+15 ); // GZip
else
throw Bu::ExceptionBase("Format mode for deflate read.");
pState->next_in = (Bytef *)pBuf;
pState->avail_in = 0;
}
if( bReading == false )
throw ExceptionBase("This deflate filter is in writing mode, you can't read.");
int nRead = 0;
int nReadTotal = pState->total_out;
pState->next_out = (Bytef *)pData;
pState->avail_out = nBytes;
for(;;)
{
int ret = inflate( pState, Z_NO_FLUSH );
nReadTotal += nRead-pState->avail_out;
if( ret == Z_STREAM_END )
{
bEos = true;
if( pState->avail_in > 0 )
{
if( rNext.isSeekable() )
{
rNext.seek( -pState->avail_in );
}
}
return nBytes-pState->avail_out;
}
if( ret != Z_BUF_ERROR )
zError( ret );
if( pState->avail_out )
{
if( pState->avail_in == 0 )
{
nRead = rNext.read( pBuf, nBufSize );
if( nRead == 0 && rNext.isEos() )
{
throw Bu::ExceptionBase("Premature end of underlying "
"stream found reading deflate stream.");
}
pState->next_in = (Bytef *)pBuf;
pState->avail_in = nRead;
}
}
else
{
return nBytes-pState->avail_out;
}
}
return 0;
}
Bu::size Bu::Deflate::write( const void *pData, Bu::size nBytes )
{
TRACE( pData, nBytes );
if( nBytes <= 0 )
return 0;
if( !pState->state )
{
bReading = false;
int iFmt = eFmt&Gzip;
if( iFmt == Raw )
deflateInit2( pState, nCompression, Z_DEFLATED, -15, 9,
Z_DEFAULT_STRATEGY );
else if( iFmt == Zlib )
deflateInit2( pState, nCompression, Z_DEFLATED, 15, 9,
Z_DEFAULT_STRATEGY );
else if( iFmt == Gzip )
deflateInit2( pState, nCompression, Z_DEFLATED, 16+15, 9,
Z_DEFAULT_STRATEGY );
else
throw Bu::ExceptionBase("Invalid format for deflate.");
}
if( bReading == true )
throw ExceptionBase("This deflate filter is in reading mode, you can't write.");
pState->next_in = (Bytef *)pData;
pState->avail_in = nBytes;
for(;;)
{
pState->avail_out = nBufSize;
pState->next_out = (Bytef *)pBuf;
zError( deflate( pState, Z_NO_FLUSH ) );
if( pState->avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-pState->avail_out );
}
if( pState->avail_in == 0 )
break;
}
return nBytes;
}
bool Bu::Deflate::isOpen()
{
TRACE();
return (pState != NULL && pState->state != NULL);
}
bool Bu::Deflate::isEos()
{
TRACE();
return bEos;
}
Bu::size Bu::Deflate::getCompressedSize()
{
return sTotalOut;
}
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