xmlhelp/source/cxxhelp/util/Decompressor.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 <util/Decompressor.hxx>
  21 #include <util/CompressorIterator.hxx>
  22
  23 using namespace xmlsearch;
  24 using namespace xmlsearch::util;
  25
  26 const sal_Int32 Decompressor::BitsInByte = 8;
  27 const sal_Int32 Decompressor::NBits = 32;
  28
  29 inline sal_Int32 getInteger_( const sal_Int8* v )
  30 {
  31     return (((((( (v[0]&0xFF) ) << 8 )
  32                 | (v[1]&0xFF) ) << 8 )
  33                 | (v[2]&0xFF) ) << 8 )
  34                 | (v[3]&0xFF);
  35 }
  36
  37 sal_Int32 StreamDecompressor::getNextByte()
  38 {
  39   sal_Int8 a[4];
  40   a[0] = a[1] = a[2] = 0;
  41   if( in_->readBytes( &a[3],1 ) != -1 )
  42     return getInteger_( a );
  43   else
  44     return -1;
  45 }
  46
  47 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */