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script.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/kyra/script.h $
 * $Id: script.h 20450 2006-02-09 22:50:59Z fingolfin $
 *
 */

#ifndef KYRASCRIPT_H
#define KYRASCRIPT_H

#include "kyra/kyra.h"

namespace Kyra {
struct ScriptData {
      byte *text;
      byte *data;
      byte *ordr;
      uint16 dataSize;
      KyraEngine::OpcodeProc *opcodes;
      int opcodeSize;
      uint16 mustBeFreed;
};

struct ScriptState {
      byte *ip;
      ScriptData *dataPtr;
      int16 retValue;
      uint16 bp;
      uint16 sp;
      int16 variables[30];
      int16 stack[61];
};

enum {
      SCRIPT_INIT = 0
};

class ScriptHelper {
public:
      ScriptHelper(KyraEngine *vm);
      virtual ~ScriptHelper();
      
      bool loadScript(const char *filename, ScriptData *data, KyraEngine::OpcodeProc *opcodes, int opcodeSize, byte *specialPtr = 0);
      void unloadScript(ScriptData *data);
      
      void initScript(ScriptState *scriptState, ScriptData *data);
      bool startScript(ScriptState *script, int function);
      
      bool validScript(ScriptState *script);
      
      bool runScript(ScriptState *script);
protected:
      uint32 getFORMBlockSize(byte *&data) const;
      uint32 getIFFBlockSize(byte *start, byte *&data, uint32 maxSize, const uint32 chunk) const;
      bool loadIFFBlock(byte *start, byte *&data, uint32 maxSize, const uint32 chunk, byte *loadTo, uint32 ptrSize) const;
      
      KyraEngine *_vm;
      int16 _parameter;
      bool _continue;

      typedef void (ScriptHelper::*CommandProc)(ScriptState*);
      struct CommandEntry {
            CommandProc proc;
            const char* desc;
      };
      
      const CommandEntry *_commands;
private:
      void c1_jmpTo(ScriptState*);
      void c1_setRetValue(ScriptState*);
      void c1_pushRetOrPos(ScriptState*);
      void c1_push(ScriptState*);
      //void c1_push(); same as 03
      void c1_pushVar(ScriptState*);
      void c1_pushBPNeg(ScriptState*);
      void c1_pushBPAdd(ScriptState*);
      void c1_popRetOrPos(ScriptState*);
      void c1_popVar(ScriptState*);
      void c1_popBPNeg(ScriptState*);
      void c1_popBPAdd(ScriptState*);
      void c1_addSP(ScriptState*);
      void c1_subSP(ScriptState*);
      void c1_execOpcode(ScriptState*);
      void c1_ifNotJmp(ScriptState*);
      void c1_negate(ScriptState*);
      void c1_eval(ScriptState*);
      void c1_setRetAndJmp(ScriptState*);
};
} // end of namespace Kyra

#endif

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