src/BlockBuffer.h
00001 /* -*- C++ -*- 00002 00003 textIR - A fast text document retrieval engine 00004 00005 Copyright (C) 2005-2009 Laurence Park 00006 00007 This program is free software: you can redistribute it and/or modify 00008 it under the terms of the GNU General Public License as published by 00009 the Free Software Foundation, either version 3 of the License, or 00010 (at your option) any later version. 00011 00012 This program is distributed in the hope that it will be useful, 00013 but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 GNU General Public License for more details. 00016 00017 You should have received a copy of the GNU General Public License 00018 along with this program. If not, see <http://www.gnu.org/licenses/>. 00019 00020 File information: 00021 $Header: /home/staff/lapark/cvsroot/web_search/textIR/src/BlockBuffer.h,v 1.4 2009/10/08 06:41:29 lapark Exp $ 00022 */ 00023 00024 #ifndef BLOCKBUFFER_H 00025 #define BLOCKBUFFER_H 00026 00047 class BlockBuffer { 00048 public: 00049 00051 BlockBuffer(int bufferSize); 00052 virtual ~BlockBuffer(void); 00053 00055 char *bufferPtr(void); 00056 00058 long bufferSize(void); 00059 00061 bool bufferFull(void); 00062 00064 bool bufferOverflow(void); 00065 00067 void padBuffer(void); 00068 00069 //void zeroBuffer(void); 00070 00072 void initialise(void); 00073 00075 void truncateToNextBlock(int blockSize); 00076 00078 void encodeInt(int element); 00079 00081 int decodeInt(void); 00082 00084 long bufferByteAlign(int blockBytes); 00085 00087 virtual void flushBuffer(void) = 0; 00088 00089 // long _filePosition; 00090 protected: 00091 const int _bufferSize; 00092 // int _bufferBlockSize; 00093 char *_buffer; 00094 char *_bufferPosition; 00095 char *_endBuffer; 00096 }; 00097 00098 #endif
