disasm.h

Decompilation Dos Program is a technique that allows you to recover lost source code. It is also nee

/*---------------------------------------------------------------------------*/
// DisC Decompilation Wizard
// written by
// Satish Kumar S
// [e-mail]
//
// Copyright 1999-2001 Satish Kumar S
//
// Permission is granted to use this software for research purposes as
// long as this notice stays attached to this software.
/*---------------------------------------------------------------------------*/
#ifndef _DISASM_H		// Disasm.h
#define _DISASM_H

#include "Global.h"
#include "MyString.h"
#include "InstInfo.h"

extern char Regstr[2][8][3];

class Disasm
{
  int Opcode;		// Includes both actual opcode + D + W fields.
  int D,W;
  int Mod,Reg,RM;
  int Len;
  int SRegs;		// Segment registers?
  int FirstOperand;	// Only first operand?
  int SecondOperand;	// Only second operand?

  char far *Ip;		// Temporary pointer for sync between procedures.
  Byte far *CodePtr;	// Points to the code to be displayed.
  Word regIP;		// The contents of IP for the next instruction.

  String &GetOperands();
  String &Operand1(int Reg,int W,int SRegs = FALSE);
  String &Operand2(int Mod,int RM,int W = 0,int Offset = 0);
  String &Immediate(int Offset = 0);
  String &ImmediateByte(int Offset = 0);
  String &ImmediateWord(int Offset = 0);
  String &ImmediateSByte(int Offset = 0);
  String &ImmediateSWord(int Offset = 0);
  Byte    GetImmediateByte(int Offset = 0);
  Word    GetImmediateWord(int Offset = 0);
  SByte   GetImmediateSByte(int Offset = 0);
  Sword   GetImmediateSWord(int Offset = 0);
  Word    GetImmediate(int Offset = 0);

public:
  InstInfo CurInst;
  Disasm();
  String  GetAsm(Byte far *Insts,int &InstrLength);
  void TraceInst(Byte far *Insts,int &InstrLength);
  Word DispPage(int NumLines);
  void UpdateCodePtr(Byte far *Ptr);
  void SetCodePtr(Byte far *Ptr);
  void SetregIP(Word IP);
  Dword GetProcSize(Byte far *ProcBegin);
};

#endif				// Disasm.h