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             : #ifdef SYSTEM_ZLIB
      22             : #include <zlib.h>
      23             : #else
      24             : #include <external/zlib/zlib.h>
      25             : #endif
      26             : #include <string.h> // for memset
      27             : 
      28             : using namespace com::sun::star::uno;
      29             : using namespace ZipUtils;
      30             : 
      31             : /** Provides general purpose decompression using the ZLIB library */
      32             : 
      33        2749 : Inflater::Inflater(sal_Bool bNoWrap)
      34             : : bFinished(sal_False),
      35             :   bSetParams(sal_False),
      36             :   bNeedDict(sal_False),
      37             :   nOffset(0),
      38             :   nLength(0),
      39             :   nLastInflateError(0),
      40        2749 :   pStream(NULL)
      41             : {
      42        2749 :     pStream = new z_stream;
      43             :     /* memset to 0 to set zalloc/opaque etc */
      44        2749 :     memset (pStream, 0, sizeof(*pStream));
      45             :     sal_Int32 nRes;
      46        2749 :     nRes = inflateInit2(pStream, bNoWrap ? -MAX_WBITS : MAX_WBITS);
      47        2749 :     switch (nRes)
      48             :     {
      49             :         case Z_OK:
      50        2749 :             break;
      51             :         case Z_MEM_ERROR:
      52           0 :             delete pStream;
      53           0 :             break;
      54             :         case Z_STREAM_ERROR:
      55           0 :             delete pStream;
      56           0 :             break;
      57             :         default:
      58           0 :             break;
      59             :     }
      60        2749 : }
      61             : 
      62        5478 : Inflater::~Inflater()
      63             : {
      64        2739 :     end();
      65        2739 : }
      66             : 
      67        1734 : void SAL_CALL Inflater::setInput( const Sequence< sal_Int8 >& rBuffer )
      68             : {
      69        1734 :     sInBuffer = rBuffer;
      70        1734 :     nOffset = 0;
      71        1734 :     nLength = rBuffer.getLength();
      72        1734 : }
      73             : 
      74        1734 : sal_Bool SAL_CALL Inflater::needsDictionary(  )
      75             : {
      76        1734 :     return bNeedDict;
      77             : }
      78             : 
      79        1735 : sal_Bool SAL_CALL Inflater::finished(  )
      80             : {
      81        1735 :     return bFinished;
      82             : }
      83             : 
      84        3535 : sal_Int32 SAL_CALL Inflater::doInflateSegment( Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
      85             : {
      86        3535 :     if (nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength())
      87             :     {
      88             :         // do error handling
      89             :     }
      90        3535 :     return doInflateBytes(rBuffer, nNewOffset, nNewLength);
      91             : }
      92             : 
      93        2739 : void SAL_CALL Inflater::end(  )
      94             : {
      95        2739 :     if (pStream != NULL)
      96             :     {
      97             : #if !defined Z_PREFIX
      98        2739 :         inflateEnd(pStream);
      99             : #else
     100             :         z_inflateEnd(pStream);
     101             : #endif
     102        2739 :         delete pStream;
     103             :     }
     104        2739 :     pStream = NULL;
     105        2739 : }
     106             : 
     107        3535 : sal_Int32 Inflater::doInflateBytes (Sequence < sal_Int8 >  &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
     108             : {
     109        3535 :     if ( !pStream )
     110             :     {
     111           0 :         nLastInflateError = Z_STREAM_ERROR;
     112           0 :         return 0;
     113             :     }
     114             : 
     115        3535 :     nLastInflateError = 0;
     116             : 
     117        3535 :     pStream->next_in   = ( unsigned char* ) ( sInBuffer.getConstArray() + nOffset );
     118        3535 :     pStream->avail_in  = nLength;
     119        3535 :     pStream->next_out  = reinterpret_cast < unsigned char* > ( rBuffer.getArray() + nNewOffset );
     120        3535 :     pStream->avail_out = nNewLength;
     121             : 
     122             : #if !defined Z_PREFIX
     123        3535 :     sal_Int32 nResult = ::inflate(pStream, Z_PARTIAL_FLUSH);
     124             : #else
     125             :     sal_Int32 nResult = ::z_inflate(pStream, Z_PARTIAL_FLUSH);
     126             : #endif
     127             : 
     128        3535 :     switch (nResult)
     129             :     {
     130             :         case Z_STREAM_END:
     131        1732 :             bFinished = sal_True;
     132             :         case Z_OK:
     133        1800 :             nOffset += nLength - pStream->avail_in;
     134        1800 :             nLength = pStream->avail_in;
     135        1800 :             return nNewLength - pStream->avail_out;
     136             : 
     137             :         case Z_NEED_DICT:
     138           0 :             bNeedDict = sal_True;
     139           0 :             nOffset += nLength - pStream->avail_in;
     140           0 :             nLength = pStream->avail_in;
     141           0 :             return 0;
     142             : 
     143             :         default:
     144             :             // it is no error, if there is no input or no output
     145        1735 :             if ( nLength && nNewLength )
     146           1 :                 nLastInflateError = nResult;
     147             :     }
     148             : 
     149        1735 :     return 0;
     150             : }
     151             : 
     152             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */