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/Inflater.hxx>
      21             : #include <zlib.h>
      22             : #include <string.h>
      23             : 
      24             : using namespace com::sun::star::uno;
      25             : using namespace ZipUtils;
      26             : 
      27             : /** Provides general purpose decompression using the ZLIB library */
      28             : 
      29       43241 : Inflater::Inflater(bool bNoWrap)
      30             : : bFinished(false),
      31             :   bSetParams(false),
      32             :   bNeedDict(false),
      33             :   nOffset(0),
      34             :   nLength(0),
      35             :   nLastInflateError(0),
      36       43241 :   pStream(NULL)
      37             : {
      38       43241 :     pStream = new z_stream;
      39             :     /* memset to 0 to set zalloc/opaque etc */
      40       43241 :     memset (pStream, 0, sizeof(*pStream));
      41             :     sal_Int32 nRes;
      42       43241 :     nRes = inflateInit2(pStream, bNoWrap ? -MAX_WBITS : MAX_WBITS);
      43       43241 :     switch (nRes)
      44             :     {
      45             :         case Z_OK:
      46       43241 :             break;
      47             :         case Z_MEM_ERROR:
      48           0 :             delete pStream;
      49           0 :             break;
      50             :         case Z_STREAM_ERROR:
      51           0 :             delete pStream;
      52           0 :             break;
      53             :         default:
      54           0 :             break;
      55             :     }
      56       43241 : }
      57             : 
      58       86452 : Inflater::~Inflater()
      59             : {
      60       43226 :     end();
      61       43226 : }
      62             : 
      63       23527 : void SAL_CALL Inflater::setInput( const Sequence< sal_Int8 >& rBuffer )
      64             : {
      65       23527 :     sInBuffer = rBuffer;
      66       23527 :     nOffset = 0;
      67       23527 :     nLength = rBuffer.getLength();
      68       23527 : }
      69             : 
      70       23527 : bool SAL_CALL Inflater::needsDictionary(  )
      71             : {
      72       23527 :     return bNeedDict;
      73             : }
      74             : 
      75       23528 : bool SAL_CALL Inflater::finished(  )
      76             : {
      77       23528 :     return bFinished;
      78             : }
      79             : 
      80       50375 : sal_Int32 SAL_CALL Inflater::doInflateSegment( Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
      81             : {
      82       50375 :     if (nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength())
      83             :     {
      84             :         // do error handling
      85             :     }
      86       50375 :     return doInflateBytes(rBuffer, nNewOffset, nNewLength);
      87             : }
      88             : 
      89       43226 : void SAL_CALL Inflater::end(  )
      90             : {
      91       43226 :     if (pStream != NULL)
      92             :     {
      93             : #if !defined Z_PREFIX
      94       43226 :         inflateEnd(pStream);
      95             : #else
      96             :         z_inflateEnd(pStream);
      97             : #endif
      98       43226 :         delete pStream;
      99             :     }
     100       43226 :     pStream = NULL;
     101       43226 : }
     102             : 
     103       50375 : sal_Int32 Inflater::doInflateBytes (Sequence < sal_Int8 >  &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
     104             : {
     105       50375 :     if ( !pStream )
     106             :     {
     107           0 :         nLastInflateError = Z_STREAM_ERROR;
     108           0 :         return 0;
     109             :     }
     110             : 
     111       50375 :     nLastInflateError = 0;
     112             : 
     113       50375 :     pStream->next_in   = ( unsigned char* ) ( sInBuffer.getConstArray() + nOffset );
     114       50375 :     pStream->avail_in  = nLength;
     115       50375 :     pStream->next_out  = reinterpret_cast < unsigned char* > ( rBuffer.getArray() + nNewOffset );
     116       50375 :     pStream->avail_out = nNewLength;
     117             : 
     118             : #if !defined Z_PREFIX
     119       50375 :     sal_Int32 nResult = ::inflate(pStream, Z_PARTIAL_FLUSH);
     120             : #else
     121             :     sal_Int32 nResult = ::z_inflate(pStream, Z_PARTIAL_FLUSH);
     122             : #endif
     123             : 
     124       50375 :     switch (nResult)
     125             :     {
     126             :         case Z_STREAM_END:
     127       23351 :             bFinished = true;
     128             :         case Z_OK:
     129       27021 :             nOffset += nLength - pStream->avail_in;
     130       27021 :             nLength = pStream->avail_in;
     131       27021 :             return nNewLength - pStream->avail_out;
     132             : 
     133             :         case Z_NEED_DICT:
     134           0 :             bNeedDict = true;
     135           0 :             nOffset += nLength - pStream->avail_in;
     136           0 :             nLength = pStream->avail_in;
     137           0 :             return 0;
     138             : 
     139             :         default:
     140             :             // it is no error, if there is no input or no output
     141       23354 :             if ( nLength && nNewLength )
     142           1 :                 nLastInflateError = nResult;
     143             :     }
     144             : 
     145       23354 :     return 0;
     146             : }
     147             : 
     148             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */