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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/lzma.h"
#include "bu/trace.h"
#include <lzma.h>
#define pState ((lzma_stream *)prState)
using namespace Bu;
Bu::Lzma::Lzma( Bu::Stream &rNext, int nCompression, Format eFmt ) :
Bu::Filter( rNext ),
prState( NULL ),
nCompression( nCompression ),
sTotalOut( 0 ),
eFmt( eFmt ),
bEos( false )
{
TRACE( nCompression );
start();
}
Bu::Lzma::~Lzma()
{
TRACE();
stop();
}
void Bu::Lzma::start()
{
TRACE();
nBufSize = 64*1024;
pBuf = new char[nBufSize];
}
Bu::size Bu::Lzma::stop()
{
TRACE();
if( pState )
{
if( bReading )
{
lzma_end( 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 = (uint8_t *)pBuf;
int res = lzma_code( pState, LZMA_FINISH );
if( pState->avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-pState->avail_out );
}
if( res == LZMA_STREAM_END )
break;
}
lzma_end( pState );
delete[] pBuf;
pBuf = NULL;
delete pState;
prState = NULL;
return sTotalOut;
}
}
return 0;
}
void Bu::Lzma::lzmaError( int code )
{
TRACE( code );
switch( code )
{
case LZMA_OK:
case LZMA_STREAM_END:
case LZMA_NO_CHECK:
case LZMA_UNSUPPORTED_CHECK:
break;
case LZMA_MEM_ERROR:
throw ExceptionBase("Lzma: Memory allocation error.");
case LZMA_MEMLIMIT_ERROR:
throw ExceptionBase("Lzma: Memory usage limit was reached.");
case LZMA_FORMAT_ERROR:
throw ExceptionBase("Lzma: File format not recognized.");
case LZMA_OPTIONS_ERROR:
throw ExceptionBase("Lzma: Invalid or unsupported options.");
case LZMA_DATA_ERROR:
throw ExceptionBase("Lzma: Data is corrupt.");
case LZMA_BUF_ERROR:
throw ExceptionBase("Lzma: No progress is possible.");
case LZMA_PROG_ERROR:
throw ExceptionBase("Lzma: Programming error.");
default:
throw ExceptionBase("Lzma: Unknown error encountered." );
}
}
Bu::size Bu::Lzma::read( void *pData, Bu::size nBytes )
{
TRACE( pData, nBytes );
if( !pState )
{
prState = new ::lzma_stream;
lzma_stream zEmpty = LZMA_STREAM_INIT;
Bu::memcpy( prState, &zEmpty, sizeof(lzma_stream) );
bReading = true;
lzmaError( lzma_auto_decoder( pState, UINT64_MAX, 0 ) );
pState->next_in = (uint8_t *)pBuf;
pState->avail_in = 0;
}
if( bReading == false )
throw ExceptionBase("This lzma filter is in writing mode, you can't read.");
int nRead = 0;
int nReadTotal = pState->total_out;
pState->next_out = (uint8_t *)pData;
pState->avail_out = nBytes;
for(;;)
{
int ret = lzma_code( pState, LZMA_RUN );
printf("inflate returned %d; avail in=%d, out=%d\n", ret,
pState->avail_in, pState->avail_out );
nReadTotal += nRead-pState->avail_out;
if( ret == LZMA_STREAM_END )
{
bEos = true;
if( pState->avail_in > 0 )
{
if( rNext.isSeekable() )
{
rNext.seek( -pState->avail_in );
}
}
return nBytes-pState->avail_out;
}
// if( ret != LZMA_BUF_ERROR )
lzmaError( 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 = (uint8_t *)pBuf;
pState->avail_in = nRead;
}
}
else
{
return nBytes-pState->avail_out;
}
}
return 0;
}
Bu::size Bu::Lzma::write( const void *pData, Bu::size nBytes )
{
TRACE( pData, nBytes );
if( !pState )
{
prState = new ::lzma_stream;
lzma_stream zEmpty = LZMA_STREAM_INIT;
Bu::memcpy( prState, &zEmpty, sizeof(lzma_stream) );
bReading = false;
if( eFmt == Xz )
lzmaError(
lzma_easy_encoder( pState, nCompression, LZMA_CHECK_CRC64 )
);
else if( eFmt == LzmaAlone )
{
lzma_options_lzma opt;
lzma_lzma_preset( &opt, nCompression );
lzmaError( lzma_alone_encoder( pState, &opt ) );
}
else
throw Bu::ExceptionBase("Invalid format for lzma.");
}
if( bReading == true )
throw ExceptionBase("This lzma filter is in reading mode, you can't write.");
pState->next_in = (uint8_t *)pData;
pState->avail_in = nBytes;
for(;;)
{
pState->avail_out = nBufSize;
pState->next_out = (uint8_t *)pBuf;
lzmaError( lzma_code( pState, LZMA_RUN ) );
if( pState->avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-pState->avail_out );
}
if( pState->avail_in == 0 )
break;
}
return nBytes;
}
bool Bu::Lzma::isOpen()
{
TRACE();
return (pState != NULL);
}
bool Bu::Lzma::isEos()
{
TRACE();
return bEos;
}
Bu::size Bu::Lzma::getCompressedSize()
{
return sTotalOut;
}
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