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       88706 : Inflater::Inflater(bool bNoWrap)
      30             : : bFinished(false),
      31             :   bSetParams(false),
      32             :   bNeedDict(false),
      33             :   nOffset(0),
      34             :   nLength(0),
      35             :   nLastInflateError(0),
      36       88706 :   pStream(NULL)
      37             : {
      38       88706 :     pStream = new z_stream;
      39             :     /* memset to 0 to set zalloc/opaque etc */
      40       88706 :     memset (pStream, 0, sizeof(*pStream));
      41             :     sal_Int32 nRes;
      42       88706 :     nRes = inflateInit2(pStream, bNoWrap ? -MAX_WBITS : MAX_WBITS);
      43       88706 :     switch (nRes)
      44             :     {
      45             :         case Z_OK:
      46       88706 :             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       88706 : }
      57             : 
      58      177372 : Inflater::~Inflater()
      59             : {
      60       88686 :     end();
      61       88686 : }
      62             : 
      63       44401 : void SAL_CALL Inflater::setInput( const Sequence< sal_Int8 >& rBuffer )
      64             : {
      65       44401 :     sInBuffer = rBuffer;
      66       44401 :     nOffset = 0;
      67       44401 :     nLength = rBuffer.getLength();
      68       44401 : }
      69             : 
      70             : 
      71             : 
      72       99366 : sal_Int32 SAL_CALL Inflater::doInflateSegment( Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
      73             : {
      74       99366 :     if (nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength())
      75             :     {
      76             :         // do error handling
      77             :     }
      78       99366 :     return doInflateBytes(rBuffer, nNewOffset, nNewLength);
      79             : }
      80             : 
      81       88686 : void SAL_CALL Inflater::end(  )
      82             : {
      83       88686 :     if (pStream != NULL)
      84             :     {
      85             : #if !defined Z_PREFIX
      86       88686 :         inflateEnd(pStream);
      87             : #else
      88             :         z_inflateEnd(pStream);
      89             : #endif
      90       88686 :         delete pStream;
      91             :     }
      92       88686 :     pStream = NULL;
      93       88686 : }
      94             : 
      95       99366 : sal_Int32 Inflater::doInflateBytes (Sequence < sal_Int8 >  &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
      96             : {
      97       99366 :     if ( !pStream )
      98             :     {
      99           0 :         nLastInflateError = Z_STREAM_ERROR;
     100           0 :         return 0;
     101             :     }
     102             : 
     103       99366 :     nLastInflateError = 0;
     104             : 
     105       99366 :     pStream->next_in   = reinterpret_cast<unsigned char*>( sInBuffer.getArray() + nOffset );
     106       99366 :     pStream->avail_in  = nLength;
     107       99366 :     pStream->next_out  = reinterpret_cast < unsigned char* > ( rBuffer.getArray() + nNewOffset );
     108       99366 :     pStream->avail_out = nNewLength;
     109             : 
     110             : #if !defined Z_PREFIX
     111       99366 :     sal_Int32 nResult = ::inflate(pStream, Z_PARTIAL_FLUSH);
     112             : #else
     113             :     sal_Int32 nResult = ::z_inflate(pStream, Z_PARTIAL_FLUSH);
     114             : #endif
     115             : 
     116       99366 :     switch (nResult)
     117             :     {
     118             :         case Z_STREAM_END:
     119       43976 :             bFinished = true;
     120             :         case Z_OK:
     121       55387 :             nOffset += nLength - pStream->avail_in;
     122       55387 :             nLength = pStream->avail_in;
     123       55387 :             return nNewLength - pStream->avail_out;
     124             : 
     125             :         case Z_NEED_DICT:
     126           0 :             bNeedDict = true;
     127           0 :             nOffset += nLength - pStream->avail_in;
     128           0 :             nLength = pStream->avail_in;
     129           0 :             return 0;
     130             : 
     131             :         default:
     132             :             // it is no error, if there is no input or no output
     133       43979 :             if ( nLength && nNewLength )
     134           1 :                 nLastInflateError = nResult;
     135             :     }
     136             : 
     137       43979 :     return 0;
     138             : }
     139             : 
     140             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */