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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <package/Deflater.hxx>
#ifdef SYSTEM_ZLIB
#include <zlib.h>
#else
#include <external/zlib/zlib.h>
#endif
#include <com/sun/star/packages/zip/ZipConstants.hpp>
#include <string.h> // for memset
using namespace com::sun::star::packages::zip::ZipConstants;
using namespace com::sun::star;
using namespace ZipUtils;
/** Provides general purpose compression using the ZLIB compression
* library.
*/
Deflater::~Deflater(void)
{
end();
}
void Deflater::init (sal_Int32 nLevelArg, sal_Int32 nStrategyArg, sal_Bool bNowrap)
{
pStream = new z_stream;
/* Memset it to 0...sets zalloc/zfree/opaque to NULL */
memset (pStream, 0, sizeof(*pStream));
switch (deflateInit2(pStream, nLevelArg, Z_DEFLATED, bNowrap? -MAX_WBITS : MAX_WBITS,
DEF_MEM_LEVEL, nStrategyArg))
{
case Z_OK:
break;
case Z_MEM_ERROR:
delete pStream;
break;
case Z_STREAM_ERROR:
delete pStream;
break;
default:
break;
}
}
Deflater::Deflater(sal_Int32 nSetLevel, sal_Bool bNowrap)
: bFinish(sal_False)
, bFinished(sal_False)
, bSetParams(sal_False)
, nLevel(nSetLevel)
, nStrategy(DEFAULT_STRATEGY)
, nOffset(0)
, nLength(0)
{
init(nSetLevel, DEFAULT_STRATEGY, bNowrap);
}
sal_Int32 Deflater::doDeflateBytes (uno::Sequence < sal_Int8 > &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
{
sal_Int32 nResult;
if (bSetParams)
{
pStream->next_in = (unsigned char*) sInBuffer.getConstArray() + nOffset;
pStream->next_out = (unsigned char*) rBuffer.getArray()+nNewOffset;
pStream->avail_in = nLength;
pStream->avail_out = nNewLength;
#if !defined Z_PREFIX
nResult = deflateParams(pStream, nLevel, nStrategy);
#else
nResult = z_deflateParams(pStream, nLevel, nStrategy);
#endif
switch (nResult)
{
case Z_OK:
bSetParams = sal_False;
nOffset += nLength - pStream->avail_in;
nLength = pStream->avail_in;
return nNewLength - pStream->avail_out;
case Z_BUF_ERROR:
bSetParams = sal_False;
return 0;
default:
return 0;
}
}
else
{
pStream->next_in = (unsigned char*) sInBuffer.getConstArray() + nOffset;
pStream->next_out = (unsigned char*) rBuffer.getArray()+nNewOffset;
pStream->avail_in = nLength;
pStream->avail_out = nNewLength;
#if !defined Z_PREFIX
nResult = deflate(pStream, bFinish ? Z_FINISH : Z_NO_FLUSH);
#else
nResult = z_deflate(pStream, bFinish ? Z_FINISH : Z_NO_FLUSH);
#endif
switch (nResult)
{
case Z_STREAM_END:
bFinished = sal_True;
case Z_OK:
nOffset += nLength - pStream->avail_in;
nLength = pStream->avail_in;
return nNewLength - pStream->avail_out;
case Z_BUF_ERROR:
bSetParams = sal_False;
return 0;
default:
return 0;
}
}
}
void SAL_CALL Deflater::setInputSegment( const uno::Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
{
OSL_ASSERT( !(nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength()));
sInBuffer = rBuffer;
nOffset = nNewOffset;
nLength = nNewLength;
}
void SAL_CALL Deflater::setLevel( sal_Int32 nNewLevel )
{
if ((nNewLevel < 0 || nNewLevel > 9) && nNewLevel != DEFAULT_COMPRESSION)
{
// do error handling
}
if (nNewLevel != nLevel)
{
nLevel = nNewLevel;
bSetParams = sal_True;
}
}
sal_Bool SAL_CALL Deflater::needsInput( )
{
return nLength <=0;
}
void SAL_CALL Deflater::finish( )
{
bFinish = sal_True;
}
sal_Bool SAL_CALL Deflater::finished( )
{
return bFinished;
}
sal_Int32 SAL_CALL Deflater::doDeflateSegment( uno::Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
{
OSL_ASSERT( !(nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength()));
return doDeflateBytes(rBuffer, nNewOffset, nNewLength);
}
sal_Int32 SAL_CALL Deflater::getTotalIn( )
{
return pStream->total_in;
}
sal_Int32 SAL_CALL Deflater::getTotalOut( )
{
return pStream->total_out;
}
void SAL_CALL Deflater::reset( )
{
#if !defined Z_PREFIX
deflateReset(pStream);
#else
z_deflateReset(pStream);
#endif
bFinish = sal_False;
bFinished = sal_False;
nOffset = nLength = 0;
}
void SAL_CALL Deflater::end( )
{
if (pStream != NULL)
{
#if !defined Z_PREFIX
deflateEnd(pStream);
#else
z_deflateEnd(pStream);
#endif
delete pStream;
}
pStream = NULL;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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