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91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
/* ResidualVM - A 3D game interpreter
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*
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* ResidualVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the AUTHORS
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* file distributed with this source distribution.
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*
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* Additional copyright for this file:
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* Copyright (C) 1999-2000 Revolution Software Ltd.
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* This code is based on source code created by Revolution Software,
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* used with permission.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef ICB_DATAPACKER_HH
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#define ICB_DATAPACKER_HH
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#include "common/stream.h"
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namespace ICB {
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// Pack: 4 values into 4*14 bits = 56-bits = 7 bytes
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#define BUFFER_BYTE_SIZE (7)
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#define PACK_BIT_SIZE (14)
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#define PACK_CHUNK_SIZE (4)
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class DataPacker {
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public:
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DataPacker();
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~DataPacker();
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// Copy constructor
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DataPacker(DataPacker &src);
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// Assignment operator
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DataPacker &operator=(DataPacker &b);
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enum ModeEnum { NO_MODE, READ, WRITE };
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enum PackModeEnum { NO_PACKMODE, PACK, DONT_PACK };
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enum ReturnCodes { OK, BAD_POS, BAD_MODE, BAD_PACKMODE, READ_ERROR, WRITE_ERROR, BAD_READFUNC, BAD_WRITEFUNC, BAD_VALUE };
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// Start the bit-packing process : say if we are in READ or WRITE mode
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ReturnCodes open(const ModeEnum mode, const PackModeEnum packMode);
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// Put a value into the bit-stream
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ReturnCodes put(const int value, Common::WriteStream *fh);
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// Get a value from the bit-stream
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ReturnCodes Get(int &value, Common::SeekableReadStream *stream);
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// Stop the bit-packing process : will output any remaining data
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ReturnCodes close(Common::WriteStream *stream);
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ReturnCodes close(Common::SeekableReadStream *stream);
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// Simple inspectors
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int Pos() const { return pos; }
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int PackMin() const { return packMin; }
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int PackMax() const { return packMax; }
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private:
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void ClearBuffer();
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bool readMode;
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ModeEnum iMode;
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PackModeEnum iPackMode;
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int pos;
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int packMin;
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int packMax;
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unsigned char buffer[BUFFER_BYTE_SIZE];
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};
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} // End of namespace ICB
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#endif // #ifndef DATAPACKER_HH
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