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>
  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(bool bNoWrap)
  30 : bFinished(false),
  31   bSetParams(false),
  32   bNeedDict(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
  71
  72 sal_Int32 SAL_CALL Inflater::doInflateSegment( Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
  73 {
  74     if (nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength())
  75     {
  76         // do error handling
  77     }
  78     return doInflateBytes(rBuffer, nNewOffset, nNewLength);
  79 }
  80
  81 void SAL_CALL Inflater::end(  )
  82 {
  83     if (pStream != NULL)
  84     {
  85 #if !defined Z_PREFIX
  86         inflateEnd(pStream);
  87 #else
  88         z_inflateEnd(pStream);
  89 #endif
  90         delete pStream;
  91     }
  92     pStream = NULL;
  93 }
  94
  95 sal_Int32 Inflater::doInflateBytes (Sequence < sal_Int8 >  &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
  96 {
  97     if ( !pStream )
  98     {
  99         nLastInflateError = Z_STREAM_ERROR;
 100         return 0;
 101     }
 102
 103     nLastInflateError = 0;
 104
 105     pStream->next_in   = reinterpret_cast<unsigned char*>( sInBuffer.getArray() + nOffset );
 106     pStream->avail_in  = nLength;
 107     pStream->next_out  = reinterpret_cast < unsigned char* > ( rBuffer.getArray() + nNewOffset );
 108     pStream->avail_out = nNewLength;
 109
 110 #if !defined Z_PREFIX
 111     sal_Int32 nResult = ::inflate(pStream, Z_PARTIAL_FLUSH);
 112 #else
 113     sal_Int32 nResult = ::z_inflate(pStream, Z_PARTIAL_FLUSH);
 114 #endif
 115
 116     switch (nResult)
 117     {
 118         case Z_STREAM_END:
 119             bFinished = true;
 120         case Z_OK:
 121             nOffset += nLength - pStream->avail_in;
 122             nLength = pStream->avail_in;
 123             return nNewLength - pStream->avail_out;
 124
 125         case Z_NEED_DICT:
 126             bNeedDict = true;
 127             nOffset += nLength - pStream->avail_in;
 128             nLength = pStream->avail_in;
 129             return 0;
 130
 131         default:
 132             // it is no error, if there is no input or no output
 133             if ( nLength && nNewLength )
 134                 nLastInflateError = nResult;
 135     }
 136
 137     return 0;
 138 }
 139
 140 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */