1 files changed, 248 insertions, 0 deletions

diff --git a/src/lzma.cpp b/src/lzma.cpp
new file mode 100644
index 0000000..6ed0806
--- /dev/null
+++ b/src/lzma.cpp
@@ -0,0 +1,248 @@
+/*
+ * Copyright (C) 2007-2011 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;
+}
+