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/*
* Copyright (C) 2007-2012 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/bzip2.h"
#include "bu/trace.h"
#include <bzlib.h>
#define pState ((bz_stream *)prState)
using namespace Bu;
Bu::BZip2::BZip2( Bu::Stream &rNext, int nCompression ) :
Bu::Filter( rNext ),
prState( NULL ),
nCompression( nCompression ),
sTotalOut( 0 )
{
TRACE( nCompression );
start();
}
Bu::BZip2::~BZip2()
{
TRACE();
stop();
}
void Bu::BZip2::start()
{
TRACE();
prState = new bz_stream;
pState->state = NULL;
pState->bzalloc = NULL;
pState->bzfree = NULL;
pState->opaque = NULL;
nBufSize = 64*1024;
pBuf = new char[nBufSize];
}
Bu::size Bu::BZip2::stop()
{
TRACE();
if( pState->state )
{
if( bReading )
{
BZ2_bzDecompressEnd( pState );
delete[] pBuf;
pBuf = NULL;
delete pState;
prState = NULL;
return 0;
}
else
{
// Bu::size sTotal = 0;
for(;;)
{
pState->next_in = NULL;
pState->avail_in = 0;
pState->avail_out = nBufSize;
pState->next_out = pBuf;
int res = BZ2_bzCompress( pState, BZ_FINISH );
if( pState->avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-pState->avail_out );
}
if( res == BZ_STREAM_END )
break;
}
BZ2_bzCompressEnd( pState );
delete[] pBuf;
pBuf = NULL;
delete pState;
prState = NULL;
return sTotalOut;
}
}
return 0;
}
void Bu::BZip2::bzError( int code )
{
TRACE( code );
switch( code )
{
case BZ_OK:
case BZ_RUN_OK:
case BZ_FLUSH_OK:
case BZ_FINISH_OK:
return;
case BZ_CONFIG_ERROR:
throw ExceptionBase("BZip2: Library configured improperly, reinstall.");
case BZ_SEQUENCE_ERROR:
throw ExceptionBase("BZip2: Functions were called in an invalid sequence.");
case BZ_PARAM_ERROR:
throw ExceptionBase("BZip2: Invalid parameter was passed into a function.");
case BZ_MEM_ERROR:
throw ExceptionBase("BZip2: Couldn't allocate sufficient memory.");
case BZ_DATA_ERROR:
throw ExceptionBase("BZip2: Data was corrupted before decompression.");
case BZ_DATA_ERROR_MAGIC:
throw ExceptionBase("BZip2: Stream does not appear to be bzip2 data.");
case BZ_IO_ERROR:
throw ExceptionBase("BZip2: File couldn't be read from / written to.");
case BZ_UNEXPECTED_EOF:
throw ExceptionBase("BZip2: End of file encountered before end of stream.");
case BZ_OUTBUFF_FULL:
throw ExceptionBase("BZip2: Buffer not large enough to accomidate data.");
default:
throw ExceptionBase("BZip2: Unknown error encountered.");
}
}
Bu::size Bu::BZip2::read( void *pData, Bu::size nBytes )
{
TRACE( pData, nBytes );
if( !pState->state )
{
bReading = true;
BZ2_bzDecompressInit( pState, 0, 0 );
pState->next_in = pBuf;
pState->avail_in = 0;
}
if( bReading == false )
throw ExceptionBase("This bzip2 filter is in writing mode, you can't read.");
int nRead = 0;
int nReadTotal = pState->total_out_lo32;
pState->next_out = (char *)pData;
pState->avail_out = nBytes;
for(;;)
{
int ret = BZ2_bzDecompress( pState );
nReadTotal += nRead-pState->avail_out;
if( ret == BZ_STREAM_END )
{
if( pState->avail_in > 0 )
{
if( rNext.isSeekable() )
{
rNext.seek( -pState->avail_in );
}
}
return nBytes-pState->avail_out;
}
bzError( 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 bzip2 stream.");
}
pState->next_in = pBuf;
pState->avail_in = nRead;
}
}
else
{
return nBytes-pState->avail_out;
}
}
return 0;
}
Bu::size Bu::BZip2::write( const void *pData, Bu::size nBytes )
{
TRACE( pData, nBytes );
if( !pState->state )
{
bReading = false;
BZ2_bzCompressInit( pState, nCompression, 0, 30 );
}
if( bReading == true )
throw ExceptionBase("This bzip2 filter is in reading mode, you can't write.");
// Bu::size sTotalOut = 0;
pState->next_in = (char *)pData;
pState->avail_in = nBytes;
for(;;)
{
pState->avail_out = nBufSize;
pState->next_out = pBuf;
bzError( BZ2_bzCompress( pState, BZ_RUN ) );
if( pState->avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-pState->avail_out );
}
if( pState->avail_in == 0 )
break;
}
return nBytes;
}
bool Bu::BZip2::isOpen()
{
TRACE();
return (pState->state != NULL);
}
Bu::size Bu::BZip2::getCompressedSize()
{
return sTotalOut;
}
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