1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 #ifndef _DECODE_HXX 25 #define _DECODE_HXX 26 27 #ifndef _BMPACC_HXX 28 #include <vcl/bmpacc.hxx> 29 #endif 30 31 struct GIFLZWTableEntry; 32 33 class GIFLZWDecompressor 34 { 35 GIFLZWTableEntry* pTable; 36 HPBYTE pOutBuf; 37 HPBYTE pOutBufData; 38 HPBYTE pBlockBuf; 39 sal_uLong nInputBitsBuf; 40 sal_uInt16 nTableSize; 41 sal_uInt16 nClearCode; 42 sal_uInt16 nEOICode; 43 sal_uInt16 nCodeSize; 44 sal_uInt16 nOldCode; 45 sal_uInt16 nOutBufDataLen; 46 sal_uInt16 nInputBitsBufSize; 47 sal_Bool bEOIFound; 48 sal_uInt8 nDataSize; 49 sal_uInt8 nBlockBufSize; 50 sal_uInt8 nBlockBufPos; 51 52 void AddToTable(sal_uInt16 nPrevCode, sal_uInt16 nCodeFirstData); 53 sal_Bool ProcessOneCode(); 54 55 56 public: 57 58 GIFLZWDecompressor( sal_uInt8 cDataSize ); 59 ~GIFLZWDecompressor(); 60 61 HPBYTE DecompressBlock( HPBYTE pSrc, sal_uInt8 cBufSize, sal_uLong& rCount, sal_Bool& rEOI ); 62 }; 63 64 #endif 65