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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.
*
* $URL$
* $Id$
*
*/
#ifndef KYRA_SCRIPT_H
#define KYRA_SCRIPT_H
#include "common/stream.h"
#include "common/func.h"
namespace Kyra {
struct EMCState;
typedef Common::Functor1<EMCState*, int> Opcode;
struct EMCData {
byte *text;
uint16 *data;
uint16 *ordr;
uint16 dataSize;
const Common::Array<const Opcode*> *opcodes;
};
struct EMCState {
uint16 *ip;
const EMCData *dataPtr;
int16 retValue;
uint16 bp;
uint16 sp;
int16 regs[30]; // VM registers
int16 stack[61]; // VM stack
};
#define stackPos(x) (script->stack[script->sp+x])
#define stackPosString(x) ((const char*)&script->dataPtr->text[READ_BE_UINT16(&script->dataPtr->text[stackPos(x)<<1])])
#define FORM_CHUNK 0x4D524F46
#define TEXT_CHUNK 0x54584554
#define DATA_CHUNK 0x41544144
#define ORDR_CHUNK 0x5244524F
#define AVTL_CHUNK 0x4C545641
class Resource;
class KyraEngine;
class ScriptFileParser {
public:
ScriptFileParser() : _stream(0), _startOffset(0), _endOffset(0) {}
ScriptFileParser(const char *filename, Resource *res) : _stream(0), _startOffset(0), _endOffset(0) { setFile(filename, res); }
~ScriptFileParser() { destroy(); }
// 'script' must be allocated with new!
void setFile(const char *filename, Resource *res);
operator bool() const { return (_startOffset != _endOffset) && _stream; }
uint32 getFORMBlockSize();
uint32 getIFFBlockSize(const uint32 chunk);
bool loadIFFBlock(const uint32 chunk, void *loadTo, uint32 ptrSize);
private:
void destroy();
Common::SeekableReadStream *_stream;
uint32 _startOffset;
uint32 _endOffset;
};
class EMCInterpreter {
public:
EMCInterpreter(KyraEngine *vm);
bool load(const char *filename, EMCData *data, const Common::Array<const Opcode*> *opcodes);
void unload(EMCData *data);
void init(EMCState *scriptState, const EMCData *data);
bool start(EMCState *script, int function);
bool isValid(EMCState *script);
bool run(EMCState *script);
protected:
KyraEngine *_vm;
int16 _parameter;
typedef void (EMCInterpreter::*CommandProc)(EMCState*);
struct CommandEntry {
CommandProc proc;
const char *desc;
};
const CommandEntry *_commands;
private:
void cmd_jmpTo(EMCState*);
void cmd_setRetValue(EMCState*);
void cmd_pushRetOrPos(EMCState*);
void cmd_push(EMCState*);
void cmd_pushReg(EMCState*);
void cmd_pushBPNeg(EMCState*);
void cmd_pushBPAdd(EMCState*);
void cmd_popRetOrPos(EMCState*);
void cmd_popReg(EMCState*);
void cmd_popBPNeg(EMCState*);
void cmd_popBPAdd(EMCState*);
void cmd_addSP(EMCState*);
void cmd_subSP(EMCState*);
void cmd_execOpcode(EMCState*);
void cmd_ifNotJmp(EMCState*);
void cmd_negate(EMCState*);
void cmd_eval(EMCState*);
void cmd_setRetAndJmp(EMCState*);
};
} // end of namespace Kyra
#endif
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