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chunk.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2004 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: /cvsroot/scummvm/scummvm/scumm/smush/chunk.h,v 1.16 2004/07/26 23:15:01 fingolfin Exp $
 *
 */

#ifndef CHUNK_H
#define CHUNK_H

#include "common/scummsys.h"

namespace Scumm {

class ScummFile;

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;
};

// 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:
      ScummFile *_data;
      uint32 _offset;

protected:
      FileChunk();

public:
      FileChunk(const char *fname);
      virtual ~FileChunk();
      Chunk *subBlock();
      bool read(void *buffer, uint32 size);
      int8 getChar();
      byte getByte();
      short getShort();
      uint16 getWord();
      uint32 getDword();
      void reinit(uint32 offset);
};

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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