vcl/source/filter/igif/decode.hxx

   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 #pragma once
  21
  22 #include <tools/solar.h>
  23 #include <vcl/Scanline.hxx>
  24 #include <array>
  25 #include <memory>
  26
  27 struct GIFLZWTableEntry;
  28
  29 class GIFLZWDecompressor
  30 {
  31     std::unique_ptr<GIFLZWTableEntry[]>
  32                             pTable;
  33     std::array<sal_uInt8, 4096>
  34                             pOutBuf;
  35     sal_uInt8*              pOutBufData;
  36     sal_uInt8*              pBlockBuf;
  37     sal_uLong               nInputBitsBuf;
  38     bool                    bEOIFound;
  39     sal_uInt8               nDataSize;
  40     sal_uInt8               nBlockBufSize;
  41     sal_uInt8               nBlockBufPos;
  42     sal_uInt16              nClearCode;
  43     sal_uInt16              nEOICode;
  44     sal_uInt16              nTableSize;
  45     sal_uInt16              nCodeSize;
  46     sal_uInt16              nOldCode;
  47     sal_uInt16              nOutBufDataLen;
  48     sal_uInt16              nInputBitsBufSize;
  49
  50     bool                AddToTable(sal_uInt16 nPrevCode, sal_uInt16 nCodeFirstData);
  51     bool                ProcessOneCode();
  52
  53     GIFLZWDecompressor(const GIFLZWDecompressor&) = delete;
  54     GIFLZWDecompressor& operator=(const GIFLZWDecompressor&) = delete;
  55 public:
  56
  57     explicit GIFLZWDecompressor( sal_uInt8 cDataSize );
  58                         ~GIFLZWDecompressor();
  59
  60     Scanline            DecompressBlock( sal_uInt8* pSrc, sal_uInt8 cBufSize, sal_uLong& rCount, bool& rEOI );
  61 };
  62
  63 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */