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 _LZWDECOM_HXX 25 #define _LZWDECOM_HXX 26 27 #include <tools/stream.hxx> 28 29 struct LZWTableEntry { 30 sal_uInt16 nPrevCode; 31 sal_uInt16 nDataCount; 32 sal_uInt8 nData; 33 }; 34 35 class LZWDecompressor { 36 37 public: 38 39 LZWDecompressor(); 40 ~LZWDecompressor(); 41 42 void StartDecompression(SvStream & rIStream); 43 44 sal_uLong Decompress(sal_uInt8 * pTarget, sal_uLong nMaxCount); 45 // Liefert die Anzahl der geschriebenen Bytes, wenn < nMaxCount, 46 // sind keine weiteren Daten zu entpacken, oder es ist ein 47 // Fehler aufgetreten. 48 49 private: 50 51 sal_uInt16 GetNextCode(); 52 void AddToTable(sal_uInt16 nPrevCode, sal_uInt16 nCodeFirstData); 53 void DecompressSome(); 54 55 SvStream * pIStream; 56 57 LZWTableEntry * pTable; 58 sal_uInt16 nTableSize; 59 60 sal_Bool bEOIFound, bInvert, bFirst; 61 62 sal_uInt16 nOldCode; 63 64 sal_uInt8 * pOutBuf; 65 sal_uInt8 * pOutBufData; 66 sal_uInt16 nOutBufDataLen; 67 68 sal_uInt8 nInputBitsBuf; 69 sal_uInt16 nInputBitsBufSize; 70 }; 71 72 73 #endif 74 75 76