package/source/zipapi/Inflater.cxx

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