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122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001/2002 The ScummVM project
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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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* 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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* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#ifndef CHUNK_H
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#define CHUNK_H
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#include "config.h"
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/*! @brief Interface for Chunk handling
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This class is an interface for reading from a Chunk.
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\todo handle big endian system.
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*/
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class Chunk {
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public:
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enum seek_type { seek_start, seek_end, seek_cur };
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virtual ~Chunk() {};
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typedef uint32 type; //!< type of a Chunk (i.e. The first 4byte field of the Chunk structure).
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/*! @brief convert a type to a string
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Utility function that convert a type to a string.
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@param t the type to convert to a string
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@return the converted string
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*/
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static const char * ChunkString(type t);
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virtual type getType() const = 0; //!< return the type of the Chunk
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virtual uint32 getSize() const = 0; //!< return the size of the Chunk
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virtual Chunk * subBlock() = 0; //!< extract a subChunk from the current read position
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virtual bool eof() const = 0; //!< is the Chunk completely read ?
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virtual uint32 tell() const = 0; //!< get the Chunk current read position
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virtual bool seek(int32 delta, seek_type dir = seek_cur) = 0; //!< move the current read position inside the Chunk
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virtual bool read(void * buffer, uint32 size) = 0; //!< read some data for the current read position
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virtual int8 getChar() = 0; //!< extract the character at the current read position
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virtual byte getByte() = 0; //!< extract the byte at the current read position
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virtual int16 getShort() = 0; //!< extract the short at the current read position
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virtual uint16 getWord() = 0; //!< extract the word at the current read position
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virtual uint32 getDword()= 0; //!< extract the dword at the current read position
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};
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class FilePtr;
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/*! @brief file based ::Chunk
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This class is an implementation of ::Chunk that handles file.
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*/
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class FileChunk : public Chunk {
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private:
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FilePtr * _data;
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type _type;
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uint32 _size;
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uint32 _offset;
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uint32 _curPos;
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protected:
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FileChunk();
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public:
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FileChunk(const char * fname, const char * directory);
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virtual ~FileChunk();
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type getType() const;
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uint32 getSize() const;
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Chunk * subBlock();
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bool eof() const;
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uint32 tell() const;
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bool seek(int32 delta, seek_type dir = seek_cur);
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bool read(void * buffer, uint32 size);
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int8 getChar();
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byte getByte();
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short getShort();
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uint16 getWord();
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uint32 getDword();
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};
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/*! @brief memory based ::Chunk
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This class is an implementation of ::Chunk that handles a memory buffer.
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*/
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class ContChunk : public Chunk {
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private:
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byte * _data;
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Chunk::type _type;
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uint32 _size;
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uint32 _curPos;
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public:
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ContChunk(byte * data);
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Chunk::type getType() const;
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uint32 getSize() const;
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Chunk * subBlock();
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bool eof() const;
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uint32 tell() const;
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bool seek(int32 delta, seek_type dir = seek_cur);
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bool read(void * buffer, uint32 size);
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int8 getChar();
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byte getByte();
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int16 getShort();
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uint16 getWord();
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uint32 getDword();
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};
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#endif
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