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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2003 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef CHUNK_H
#define CHUNK_H
#include "common/scummsys.h"
namespace Scumm {
class Chunk {
public:
virtual ~Chunk() {};
enum seek_type { seek_start, seek_end, seek_cur };
typedef uint32 type;
static const char *ChunkString(type t);
virtual type getType() const = 0;
virtual uint32 getSize() const = 0;
virtual Chunk *subBlock() = 0;
virtual bool eof() const = 0;
virtual uint32 tell() const = 0;
virtual bool seek(int32 delta, seek_type dir = seek_cur) = 0;
virtual bool read(void *buffer, uint32 size) = 0;
virtual int8 getChar() = 0;
virtual byte getByte() = 0;
virtual int16 getShort() = 0;
virtual uint16 getWord() = 0;
virtual uint32 getDword()= 0;
};
class FilePtr;
// Common functionality for concrete chunks (FileChunk, MemoryChunk)
class BaseChunk : public Chunk {
protected:
Chunk::type _type;
uint32 _size;
uint32 _curPos;
BaseChunk();
public:
Chunk::type getType() const;
uint32 getSize() const;
bool eof() const;
uint32 tell() const;
bool seek(int32 delta, seek_type dir = seek_cur);
};
class FileChunk : public BaseChunk {
private:
FilePtr *_data;
uint32 _offset;
protected:
FileChunk();
public:
FileChunk(const char *fname, const char *directory);
virtual ~FileChunk();
Chunk *subBlock();
bool read(void *buffer, uint32 size);
int8 getChar();
byte getByte();
short getShort();
uint16 getWord();
uint32 getDword();
void reinit();
};
class MemoryChunk : public BaseChunk {
private:
byte *_data;
public:
MemoryChunk(byte *data);
Chunk *subBlock();
bool read(void *buffer, uint32 size);
int8 getChar();
byte getByte();
int16 getShort();
uint16 getWord();
uint32 getDword();
};
} // End of namespace Scumm
#endif
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