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packfile.h

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00001 /* ResidualVM - A 3D game interpreter
00002  *
00003  * ResidualVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the AUTHORS
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (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, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef PACKFILE_H
00024 #define PACKFILE_H
00025 
00026 namespace Common {
00027 class SeekableReadStream;
00028 }
00029 
00030 namespace Grim {
00031 
00032 class PackFile : public Common::SeekableReadStream {
00033 public:
00034     PackFile(Common::SeekableReadStream *data);
00035     ~PackFile();
00036 
00037     bool err() const;
00038     void clearErr();
00039     uint32 read(void *dataPtr, uint32 dataSize);
00040     bool eos() const;
00041     int32 pos() const;
00042     int32 size() const;
00043     bool seek(int32 offset, int whence = SEEK_SET);
00044 
00045 private:
00046     Common::SeekableReadStream *_orgStream;
00047     int32 _offset, _size;
00048 
00049     uint16 *_codeTable;
00050     const uint32 _kCodeTableSize;
00051 
00052     void createCodeTable(uint32 key);
00053     void decode(uint8 *data, uint32 size, uint32 start_point);
00054 
00055     static const uint32 _knownOffsets[5];
00056 };
00057 
00058 } // end of namespace Grim
00059 
00060 #endif


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