Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <package/Deflater.hxx>
      21             : #include <zlib.h>
      22             : #include <com/sun/star/packages/zip/ZipConstants.hpp>
      23             : #include <osl/diagnose.h>
      24             : #include <string.h>
      25             : 
      26             : using namespace com::sun::star::packages::zip::ZipConstants;
      27             : using namespace com::sun::star;
      28             : using namespace ZipUtils;
      29             : 
      30             : /** Provides general purpose compression using the ZLIB compression
      31             :  * library.
      32             :  */
      33             : 
      34       21434 : Deflater::~Deflater()
      35             : {
      36       10717 :     end();
      37       10717 : }
      38       10717 : void Deflater::init (sal_Int32 nLevelArg, sal_Int32 nStrategyArg, bool bNowrap)
      39             : {
      40       10717 :     pStream = new z_stream;
      41             :     /* Memset it to 0...sets zalloc/zfree/opaque to NULL */
      42       10717 :     memset (pStream, 0, sizeof(*pStream));
      43             : 
      44       10717 :     switch (deflateInit2(pStream, nLevelArg, Z_DEFLATED, bNowrap? -MAX_WBITS : MAX_WBITS,
      45             :                 DEF_MEM_LEVEL, nStrategyArg))
      46             :     {
      47             :         case Z_OK:
      48       10717 :             break;
      49             :         case Z_MEM_ERROR:
      50           0 :             delete pStream;
      51           0 :             break;
      52             :         case Z_STREAM_ERROR:
      53           0 :             delete pStream;
      54           0 :             break;
      55             :         default:
      56           0 :              break;
      57             :     }
      58       10717 : }
      59             : 
      60       10717 : Deflater::Deflater(sal_Int32 nSetLevel, bool bNowrap)
      61             : : bFinish(false)
      62             : , bFinished(false)
      63             : , nStrategy(DEFAULT_STRATEGY)
      64             : , nOffset(0)
      65       10717 : , nLength(0)
      66             : {
      67       10717 :     init(nSetLevel, DEFAULT_STRATEGY, bNowrap);
      68       10717 : }
      69             : 
      70       21696 : sal_Int32 Deflater::doDeflateBytes (uno::Sequence < sal_Int8 > &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
      71             : {
      72             :     sal_Int32 nResult;
      73       21696 :     pStream->next_in   = reinterpret_cast<unsigned char*>(sInBuffer.getArray()) + nOffset;
      74       21696 :     pStream->next_out  = reinterpret_cast<unsigned char*>(rBuffer.getArray())+nNewOffset;
      75       21696 :     pStream->avail_in  = nLength;
      76       21696 :     pStream->avail_out = nNewLength;
      77             : 
      78             : #if !defined Z_PREFIX
      79       21696 :     nResult = deflate(pStream, bFinish ? Z_FINISH : Z_NO_FLUSH);
      80             : #else
      81             :     nResult = z_deflate(pStream, bFinish ? Z_FINISH : Z_NO_FLUSH);
      82             : #endif
      83       21696 :     switch (nResult)
      84             :     {
      85             :         case Z_STREAM_END:
      86       10717 :             bFinished = true;
      87             :         case Z_OK:
      88       21696 :             nOffset += nLength - pStream->avail_in;
      89       21696 :             nLength = pStream->avail_in;
      90       21696 :             return nNewLength - pStream->avail_out;
      91             :         default:
      92           0 :             return 0;
      93             :     }
      94             : }
      95             : 
      96       11053 : void SAL_CALL Deflater::setInputSegment( const uno::Sequence< sal_Int8 >& rBuffer )
      97             : {
      98       11053 :     sInBuffer = rBuffer;
      99       11053 :     nOffset = 0;
     100       11053 :     nLength = rBuffer.getLength();
     101       11053 : }
     102             : 
     103       22032 : bool SAL_CALL Deflater::needsInput(  )
     104             : {
     105       22032 :     return nLength <=0;
     106             : }
     107       10717 : void SAL_CALL Deflater::finish(  )
     108             : {
     109       10717 :     bFinish = true;
     110       10717 : }
     111       21696 : sal_Int32 SAL_CALL Deflater::doDeflateSegment( uno::Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
     112             : {
     113             :     OSL_ASSERT( !(nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength()));
     114       21696 :     return doDeflateBytes(rBuffer, nNewOffset, nNewLength);
     115             : }
     116       10713 : sal_Int64 SAL_CALL Deflater::getTotalIn(  )
     117             : {
     118       10713 :     return pStream->total_in; // FIXME64: zlib doesn't look 64bit clean here
     119             : }
     120       10713 : sal_Int64 SAL_CALL Deflater::getTotalOut(  )
     121             : {
     122       10713 :     return pStream->total_out; // FIXME64: zlib doesn't look 64bit clean here
     123             : }
     124       10717 : void SAL_CALL Deflater::reset(  )
     125             : {
     126             : #if !defined Z_PREFIX
     127       10717 :     deflateReset(pStream);
     128             : #else
     129             :     z_deflateReset(pStream);
     130             : #endif
     131       10717 :     bFinish = false;
     132       10717 :     bFinished = false;
     133       10717 :     nOffset = nLength = 0;
     134       10717 : }
     135       10717 : void SAL_CALL Deflater::end(  )
     136             : {
     137       10717 :     if (pStream != NULL)
     138             :     {
     139             : #if !defined Z_PREFIX
     140       10717 :         deflateEnd(pStream);
     141             : #else
     142             :         z_deflateEnd(pStream);
     143             : #endif
     144       10717 :         delete pStream;
     145             :     }
     146       10717 :     pStream = NULL;
     147       10717 : }
     148             : 
     149             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */