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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>
#include <zlib.h>
#include <com/sun/star/packages/zip/ZipConstants.hpp>
#include <osl/diagnose.h>
#include <string.h>
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()
{
end();
}
void Deflater::init (sal_Int32 nLevelArg, bool bNowrap)
{
pStream.reset(new z_stream);
/* Memset it to 0...sets zalloc/zfree/opaque to NULL */
memset (pStream.get(), 0, sizeof(*pStream));
switch (deflateInit2(pStream.get(), nLevelArg, Z_DEFLATED, bNowrap? -MAX_WBITS : MAX_WBITS,
DEF_MEM_LEVEL, DEFAULT_STRATEGY))
{
case Z_OK:
break;
case Z_MEM_ERROR:
pStream.reset();
break;
case Z_STREAM_ERROR:
pStream.reset();
break;
default:
break;
}
}
Deflater::Deflater(sal_Int32 nSetLevel, bool bNowrap)
: bFinish(false)
, bFinished(false)
, nOffset(0)
, nLength(0)
, nTotalOut64(0)
, nTotalIn64(0)
{
init(nSetLevel, bNowrap);
}
sal_Int32 Deflater::doDeflateBytes (uno::Sequence < sal_Int8 > &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
{
sal_Int32 nResult;
pStream->next_in = reinterpret_cast<const unsigned char*>( sInBuffer.getConstArray() + nOffset );
pStream->next_out = reinterpret_cast<unsigned char*>(rBuffer.getArray())+nNewOffset;
pStream->avail_in = nLength;
pStream->avail_out = nNewLength;
auto nLastTotalIn = pStream->total_in;
auto nLastTotalOut = pStream->total_out;
#if !defined Z_PREFIX
nResult = deflate(pStream.get(), bFinish ? Z_FINISH : Z_NO_FLUSH);
#else
nResult = z_deflate(pStream.get(), bFinish ? Z_FINISH : Z_NO_FLUSH);
#endif
// total_in / total_out may stored only in 32bit, and can overflow during deflate
// 1 deflate call, uncompress only a few data, so only 1 overflow can happen at once.
if (pStream->total_in < nLastTotalIn)
{
nTotalIn64 += 0x100000000;
}
if (pStream->total_out < nLastTotalOut)
{
nTotalOut64 += 0x100000000;
}
switch (nResult)
{
case Z_STREAM_END:
bFinished = true;
[[fallthrough]];
case Z_OK:
nOffset += nLength - pStream->avail_in;
nLength = pStream->avail_in;
return nNewLength - pStream->avail_out;
default:
return 0;
}
}
void Deflater::setInputSegment( const uno::Sequence< sal_Int8 >& rBuffer )
{
sInBuffer = rBuffer;
nOffset = 0;
nLength = rBuffer.getLength();
}
bool Deflater::needsInput() const
{
return nLength <=0;
}
void Deflater::finish( )
{
bFinish = true;
}
sal_Int32 Deflater::doDeflateSegment( uno::Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewLength )
{
OSL_ASSERT( !(nNewLength < 0 || nNewLength > rBuffer.getLength()));
return doDeflateBytes(rBuffer, /*nNewOffset*/0, nNewLength);
}
sal_Int64 Deflater::getTotalIn() const
{
return pStream->total_in + nTotalIn64;
}
sal_Int64 Deflater::getTotalOut() const
{
return pStream->total_out + nTotalOut64;
}
void Deflater::reset( )
{
#if !defined Z_PREFIX
deflateReset(pStream.get());
#else
z_deflateReset(pStream.get());
#endif
bFinish = false;
bFinished = false;
nOffset = nLength = 0;
}
void Deflater::end( )
{
if (pStream)
{
#if !defined Z_PREFIX
deflateEnd(pStream.get());
#else
z_deflateEnd(pStream.get());
#endif
pStream.reset();
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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