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#include "bu/bzip2.h"
#include "bu/exceptions.h"
using namespace Bu;
Bu::BZip2::BZip2( Bu::Stream &rNext, int nCompression ) :
Bu::Filter( rNext ),
nCompression( nCompression )
{
start();
}
Bu::BZip2::~BZip2()
{
stop();
}
void Bu::BZip2::start()
{
bzState.state = NULL;
bzState.bzalloc = NULL;
bzState.bzfree = NULL;
bzState.opaque = NULL;
nBufSize = 50000;
pBuf = new char[nBufSize];
}
size_t Bu::BZip2::stop()
{
if( bzState.state )
{
if( bReading )
{
BZ2_bzDecompressEnd( &bzState );
return 0;
}
else
{
size_t sTotal = 0;
for(;;)
{
bzState.next_in = NULL;
bzState.avail_in = 0;
bzState.avail_out = nBufSize;
bzState.next_out = pBuf;
int res = BZ2_bzCompress( &bzState, BZ_FINISH );
if( bzState.avail_out < nBufSize )
{
sTotal += rNext.write( pBuf, nBufSize-bzState.avail_out );
}
if( res == BZ_STREAM_END )
break;
}
BZ2_bzCompressEnd( &bzState );
return sTotal;
}
}
return 0;
}
void Bu::BZip2::bzError( int 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.");
}
}
size_t Bu::BZip2::read( void *pData, size_t nBytes )
{
if( !bzState.state )
{
bReading = true;
BZ2_bzDecompressInit( &bzState, 0, 0 );
bzState.next_in = pBuf;
bzState.avail_in = 0;
}
if( bReading == false )
throw ExceptionBase("This bzip2 filter is in writing mode, you can't read.");
int nRead = 0;
int nReadTotal = bzState.total_out_lo32;
bzState.next_out = (char *)pData;
bzState.avail_out = nBytes;
for(;;)
{
int ret = BZ2_bzDecompress( &bzState );
nReadTotal += nRead-bzState.avail_out;
if( ret == BZ_STREAM_END )
{
if( bzState.avail_in > 0 )
{
if( rNext.isSeekable() )
{
rNext.seek( -bzState.avail_in );
}
}
return nBytes-bzState.avail_out;
}
bzError( ret );
if( bzState.avail_out )
{
if( bzState.avail_in == 0 )
{
nRead = rNext.read( pBuf, nBufSize );
bzState.next_in = pBuf;
bzState.avail_in = nRead;
}
}
else
{
return nBytes-bzState.avail_out;
}
}
return 0;
}
size_t Bu::BZip2::write( const void *pData, size_t nBytes )
{
if( !bzState.state )
{
bReading = false;
BZ2_bzCompressInit( &bzState, nCompression, 0, 30 );
}
if( bReading == true )
throw ExceptionBase("This bzip2 filter is in reading mode, you can't write.");
size_t sTotalOut = 0;
bzState.next_in = (char *)pData;
bzState.avail_in = nBytes;
for(;;)
{
bzState.avail_out = nBufSize;
bzState.next_out = pBuf;
bzError( BZ2_bzCompress( &bzState, BZ_RUN ) );
if( bzState.avail_out < nBufSize )
{
sTotalOut += rNext.write( pBuf, nBufSize-bzState.avail_out );
}
if( bzState.avail_in == 0 )
break;
}
return sTotalOut;
}
bool Bu::BZip2::isOpen()
{
return (bzState.state != NULL);
}
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