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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef GLK_FROTZ_MEM
#define GLK_FROTZ_MEM
#include "glk/frotz/frotz_types.h"
#include "glk/frotz/config.h"
namespace Glk {
namespace Frotz {
#define SET_WORD(addr,v) zmp[addr] = hi(v); zmp[addr+1] = lo(v)
#define LOW_WORD(addr,v) v = READ_BE_UINT16(&zmp[addr])
#define HIGH_WORD(addr,v) v = READ_BE_UINT16(&zmp[addr])
#define HIGH_LONG(addr,v) v = READ_BE_UINT32(&zmp[addr])
#define SET_BYTE(addr,v) zmp[addr] = v
#define LOW_BYTE(addr,v) v = zmp[addr]
typedef uint offset_t;
/**
* Stores undo information
*/
struct undo_struct {
undo_struct *next;
undo_struct *prev;
offset_t pc;
long diff_size;
zword frame_count;
zword stack_size;
zword frame_offset;
// undo diff and stack data follow
};
typedef undo_struct undo_t;
/**
* Handles the memory, header, and user options
*/
class Mem : public Header, public virtual UserOptions {
protected:
Common::SeekableReadStream *story_fp;
uint story_size;
byte *pcp;
byte *zmp;
undo_t *first_undo, *last_undo, *curr_undo;
zbyte *undo_mem, *prev_zmp, *undo_diff;
int undo_count;
int reserve_mem;
private:
/**
* Handles setting the story file, parsing it if it's a Blorb file
*/
void initializeStoryFile();
/**
* Handles loading the game header
*/
void loadGameHeader();
/**
* Initializes memory and loads the story data
*/
void loadMemory();
/**
* Setup undo data
*/
void initializeUndo();
protected:
/**
* Read a value from the header extension (former mouse table).
*/
zword get_header_extension(int entry);
/**
* Set an entry in the header extension (former mouse table).
*/
void set_header_extension(int entry, zword val);
/**
* Set all header fields which hold information about the interpreter.
*/
void restart_header();
/**
* Write a byte value to the dynamic Z-machine memory.
*/
void storeb(zword addr, zbyte value);
/**
* Write a word value to the dynamic Z-machine memory.
*/
void storew(zword addr, zword value);
/**
* Free count undo blocks from the beginning of the undo list
*/
void free_undo(int count);
/**
* Generates a runtime error
*/
virtual void runtimeError(ErrorCode errNum) = 0;
/**
* Called when the flags are changed
*/
virtual void flagsChanged(zbyte value) = 0;
/**
* Close the story file and deallocate memory.
*/
void reset_memory();
/**
* Set diff to a Quetzal-like difference between a and b,
* copying a to b as we go. It is assumed that diff points to a
* buffer which is large enough to hold the diff.
* mem_size is the number of bytes to compare.
* Returns the number of bytes copied to diff.
*
*/
long mem_diff(zbyte *a, zbyte *b, zword mem_size, zbyte *diff);
/**
* Applies a quetzal-like diff to dest
*/
void mem_undiff(zbyte *diff, long diff_length, zbyte *dest);
public:
/**
* Constructor
*/
Mem();
/**
* Destructor
*/
virtual ~Mem() {}
/**
* Initialize
*/
void initialize();
};
} // End of namespace Frotz
} // End of namespace Glk
#endif
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