/******************************************************************************
  ZDisasm.c		: Z0MBiE DISASM ENGINE


   Z0MBiE's HomePage

			/\\|///
			| ~_  |
		   (- 0o -)
	_oOOo_ |/ (_) \| _oOOo_
	  ||    \ ==- /    ||
	   \\   /~~~~\    //
	http://z0mbie.cjb.net
	  z0mbie@i.am (PGP)


  ******************************************************************************/


#include <windows.h>
#include "ZDisasm.h"



void GetInstLenght(DWORD* myiptr0, DWORD* osizeptr)
{
BYTE* iptr0 = (BYTE*)myiptr0;
DWORD table_1[256] =
{
  /* 00 */   C_MODRM
  /* 01 */,  C_MODRM
  /* 02 */,  C_MODRM
  /* 03 */,  C_MODRM
  /* 04 */,  C_DATAW0
  /* 05 */,  C_DATAW0
  /* 06 */,  0
  /* 07 */,  0
  /* 08 */,  C_MODRM
  /* 09 */,  C_MODRM
  /* 0A */,  C_MODRM
  /* 0B */,  C_MODRM
  /* 0C */,  C_DATAW0
  /* 0D */,  C_DATAW0
  /* 0E */,  0
  /* 0F */,  C_TABLE_0F
  /* 10 */,  C_MODRM
  /* 11 */,  C_MODRM
  /* 12 */,  C_MODRM
  /* 13 */,  C_MODRM
  /* 14 */,  C_DATAW0
  /* 15 */,  C_DATAW0
  /* 16 */,  0
  /* 17 */,  0
  /* 18 */,  C_MODRM
  /* 19 */,  C_MODRM
  /* 1A */,  C_MODRM
  /* 1B */,  C_MODRM
  /* 1C */,  C_DATAW0
  /* 1D */,  C_DATAW0
  /* 1E */,  0
  /* 1F */,  0
  /* 20 */,  C_MODRM
  /* 21 */,  C_MODRM
  /* 22 */,  C_MODRM
  /* 23 */,  C_MODRM
  /* 24 */,  C_DATAW0
  /* 25 */,  C_DATAW0
  /* 26 */,  C_PREFIX
  /* 27 */,  0
  /* 28 */,  C_MODRM
  /* 29 */,  C_MODRM
  /* 2A */,  C_MODRM
  /* 2B */,  C_MODRM
  /* 2C */,  C_DATAW0
  /* 2D */,  C_DATAW0
  /* 2E */,  C_PREFIX
  /* 2F */,  0
  /* 30 */,  C_MODRM
  /* 31 */,  C_MODRM
  /* 32 */,  C_MODRM
  /* 33 */,  C_MODRM
  /* 34 */,  C_DATAW0
  /* 35 */,  C_DATAW0
  /* 36 */,  C_PREFIX
  /* 37 */,  0
  /* 38 */,  C_MODRM
  /* 39 */,  C_MODRM
  /* 3A */,  C_MODRM
  /* 3B */,  C_MODRM
  /* 3C */,  C_DATAW0
  /* 3D */,  C_DATAW0
  /* 3E */,  C_PREFIX
  /* 3F */,  0
  /* 40 */,  0
  /* 41 */,  0
  /* 42 */,  0
  /* 43 */,  0
  /* 44 */,  0
  /* 45 */,  0
  /* 46 */,  0
  /* 47 */,  0
  /* 48 */,  0
  /* 49 */,  0
  /* 4A */,  0
  /* 4B */,  0
  /* 4C */,  0
  /* 4D */,  0
  /* 4E */,  0
  /* 4F */,  0
  /* 50 */,  0
  /* 51 */,  0
  /* 52 */,  0
  /* 53 */,  0
  /* 54 */,  0
  /* 55 */,  0
  /* 56 */,  0
  /* 57 */,  0
  /* 58 */,  0
  /* 59 */,  0
  /* 5A */,  0
  /* 5B */,  0
  /* 5C */,  0
  /* 5D */,  0
  /* 5E */,  0
  /* 5F */,  0
  /* 60 */,  0
  /* 61 */,  0
  /* 62 */,  C_MODRM
  /* 63 */,  C_MODRM
  /* 64 */,  C_PREFIX
  /* 65 */,  C_PREFIX
  /* 66 */,  C_PREFIX+C_66
  /* 67 */,  C_PREFIX+C_67
  /* 68 */,  C_DATA66
  /* 69 */,  C_MODRM+C_DATA66
  /* 6A */,  C_DATA1
  /* 6B */,  C_MODRM+C_DATA1
  /* 6C */,  0
  /* 6D */,  0
  /* 6E */,  0
  /* 6F */,  0
  /* 70 */,  C_DATA1
  /* 71 */,  C_DATA1
  /* 72 */,  C_DATA1
  /* 73 */,  C_DATA1
  /* 74 */,  C_DATA1
  /* 75 */,  C_DATA1
  /* 76 */,  C_DATA1
  /* 77 */,  C_DATA1
  /* 78 */,  C_DATA1
  /* 79 */,  C_DATA1
  /* 7A */,  C_DATA1
  /* 7B */,  C_DATA1
  /* 7C */,  C_DATA1
  /* 7D */,  C_DATA1
  /* 7E */,  C_DATA1
  /* 7F */,  C_DATA1
  /* 80 */,  C_MODRM+C_DATA1
  /* 81 */,  C_MODRM+C_DATA66
  /* 82 */,  C_MODRM+C_DATA1
  /* 83 */,  C_MODRM+C_DATA1
  /* 84 */,  C_MODRM
  /* 85 */,  C_MODRM
  /* 86 */,  C_MODRM
  /* 87 */,  C_MODRM
  /* 88 */,  C_MODRM
  /* 89 */,  C_MODRM
  /* 8A */,  C_MODRM
  /* 8B */,  C_MODRM
  /* 8C */,  C_MODRM
  /* 8D */,  C_MODRM
  /* 8E */,  C_MODRM
  /* 8F */,  C_MODRM
  /* 90 */,  0
  /* 91 */,  0
  /* 92 */,  0
  /* 93 */,  0
  /* 94 */,  0
  /* 95 */,  0
  /* 96 */,  0
  /* 97 */,  0
  /* 98 */,  0
  /* 99 */,  0
  /* 9A */,  C_DATA66+C_MEM2
  /* 9B */,  0
  /* 9C */,  0
  /* 9D */,  0
  /* 9E */,  0
  /* 9F */,  0
  /* A0 */,  C_MEM67
  /* A1 */,  C_MEM67
  /* A2 */,  C_MEM67
  /* A3 */,  C_MEM67
  /* A4 */,  0
  /* A5 */,  0
  /* A6 */,  0
  /* A7 */,  0
  /* A8 */,  C_DATA1
  /* A9 */,  C_DATA66
  /* AA */,  0
  /* AB */,  0
  /* AC */,  0
  /* AD */,  0
  /* AE */,  0
  /* AF */,  0
  /* B0 */,  C_DATA1
  /* B1 */,  C_DATA1
  /* B2 */,  C_DATA1
  /* B3 */,  C_DATA1
  /* B4 */,  C_DATA1
  /* B5 */,  C_DATA1
  /* B6 */,  C_DATA1
  /* B7 */,  C_DATA1
  /* B8 */,  C_DATA66
  /* B9 */,  C_DATA66
  /* BA */,  C_DATA66
  /* BB */,  C_DATA66
  /* BC */,  C_DATA66
  /* BD */,  C_DATA66
  /* BE */,  C_DATA66
  /* BF */,  C_DATA66
  /* C0 */,  C_MODRM+C_DATA1
  /* C1 */,  C_MODRM+C_DATA1
  /* C2 */,  C_DATA2
  /* C3 */,  0
  /* C4 */,  C_MODRM
  /* C5 */,  C_MODRM
  /* C6 */,  C_MODRM+C_DATA66
  /* C7 */,  C_MODRM+C_DATA66
  /* C8 */,  C_DATA2+C_DATA1
  /* C9 */,  0
  /* CA */,  C_DATA2
  /* CB */,  0
  /* CC */,  0
  /* CD */,  C_DATA1+C_DATA4
  /* CE */,  0
  /* CF */,  0
  /* D0 */,  C_MODRM
  /* D1 */,  C_MODRM
  /* D2 */,  C_MODRM
  /* D3 */,  C_MODRM
  /* D4 */,  0
  /* D5 */,  0
  /* D6 */,  0
  /* D7 */,  0
  /* D8 */,  C_MODRM
  /* D9 */,  C_MODRM
  /* DA */,  C_MODRM
  /* DB */,  C_MODRM
  /* DC */,  C_MODRM
  /* DD */,  C_MODRM
  /* DE */,  C_MODRM
  /* DF */,  C_MODRM
  /* E0 */,  C_DATA1
  /* E1 */,  C_DATA1
  /* E2 */,  C_DATA1
  /* E3 */,  C_DATA1
  /* E4 */,  C_DATA1
  /* E5 */,  C_DATA1
  /* E6 */,  C_DATA1
  /* E7 */,  C_DATA1
  /* E8 */,  C_DATA66
  /* E9 */,  C_DATA66
  /* EA */,  C_DATA66+C_MEM2
  /* EB */,  C_DATA1
  /* EC */,  0
  /* ED */,  0
  /* EE */,  0
  /* EF */,  0
  /* F0 */,  C_PREFIX
  /* F1 */,  0                       // 0xF1
  /* F2 */,  C_PREFIX
  /* F3 */,  C_PREFIX
  /* F4 */,  0
  /* F5 */,  0
  /* F6 */,  C_FUCKINGTEST
  /* F7 */,  C_FUCKINGTEST
  /* F8 */,  0
  /* F9 */,  0
  /* FA */,  0
  /* FB */,  0
  /* FC */,  0
  /* FD */,  0
  /* FE */,  C_MODRM
  /* FF */,  C_MODRM
}; // table_1

DWORD table_0F[256] =
{
  /* 00 */   C_MODRM
  /* 01 */,  C_MODRM
  /* 02 */,  C_MODRM
  /* 03 */,  C_MODRM
  /* 04 */,  -1
  /* 05 */,  -1
  /* 06 */,  0
  /* 07 */,  -1
  /* 08 */,  0
  /* 09 */,  0
  /* 0A */,  0
  /* 0B */,  0
  /* 0C */,  -1
  /* 0D */,  -1
  /* 0E */,  -1
  /* 0F */,  -1
  /* 10 */,  -1
  /* 11 */,  -1
  /* 12 */,  -1
  /* 13 */,  -1
  /* 14 */,  -1
  /* 15 */,  -1
  /* 16 */,  -1
  /* 17 */,  -1
  /* 18 */,  -1
  /* 19 */,  -1
  /* 1A */,  -1
  /* 1B */,  -1
  /* 1C */,  -1
  /* 1D */,  -1
  /* 1E */,  -1
  /* 1F */,  -1
  /* 20 */,  -1
  /* 21 */,  -1
  /* 22 */,  -1
  /* 23 */,  -1
  /* 24 */,  -1
  /* 25 */,  -1
  /* 26 */,  -1
  /* 27 */,  -1
  /* 28 */,  -1
  /* 29 */,  -1
  /* 2A */,  -1
  /* 2B */,  -1
  /* 2C */,  -1
  /* 2D */,  -1
  /* 2E */,  -1
  /* 2F */,  -1
  /* 30 */,  -1
  /* 31 */,  -1
  /* 32 */,  -1
  /* 33 */,  -1
  /* 34 */,  -1
  /* 35 */,  -1
  /* 36 */,  -1
  /* 37 */,  -1
  /* 38 */,  -1
  /* 39 */,  -1
  /* 3A */,  -1
  /* 3B */,  -1
  /* 3C */,  -1
  /* 3D */,  -1
  /* 3E */,  -1
  /* 3F */,  -1
  /* 40 */,  -1
  /* 41 */,  -1
  /* 42 */,  -1
  /* 43 */,  -1
  /* 44 */,  -1
  /* 45 */,  -1
  /* 46 */,  -1
  /* 47 */,  -1
  /* 48 */,  -1
  /* 49 */,  -1
  /* 4A */,  -1
  /* 4B */,  -1
  /* 4C */,  -1
  /* 4D */,  -1
  /* 4E */,  -1
  /* 4F */,  -1
  /* 50 */,  -1
  /* 51 */,  -1
  /* 52 */,  -1
  /* 53 */,  -1
  /* 54 */,  -1
  /* 55 */,  -1
  /* 56 */,  -1
  /* 57 */,  -1
  /* 58 */,  -1
  /* 59 */,  -1
  /* 5A */,  -1
  /* 5B */,  -1
  /* 5C */,  -1
  /* 5D */,  -1
  /* 5E */,  -1
  /* 5F */,  -1
  /* 60 */,  -1
  /* 61 */,  -1
  /* 62 */,  -1
  /* 63 */,  -1
  /* 64 */,  -1
  /* 65 */,  -1
  /* 66 */,  -1
  /* 67 */,  -1
  /* 68 */,  -1
  /* 69 */,  -1
  /* 6A */,  -1
  /* 6B */,  -1
  /* 6C */,  -1
  /* 6D */,  -1
  /* 6E */,  -1
  /* 6F */,  -1
  /* 70 */,  -1
  /* 71 */,  -1
  /* 72 */,  -1
  /* 73 */,  -1
  /* 74 */,  -1
  /* 75 */,  -1
  /* 76 */,  -1
  /* 77 */,  -1
  /* 78 */,  -1
  /* 79 */,  -1
  /* 7A */,  -1
  /* 7B */,  -1
  /* 7C */,  -1
  /* 7D */,  -1
  /* 7E */,  -1
  /* 7F */,  -1
  /* 80 */,  C_DATA66
  /* 81 */,  C_DATA66
  /* 82 */,  C_DATA66
  /* 83 */,  C_DATA66
  /* 84 */,  C_DATA66
  /* 85 */,  C_DATA66
  /* 86 */,  C_DATA66
  /* 87 */,  C_DATA66
  /* 88 */,  C_DATA66
  /* 89 */,  C_DATA66
  /* 8A */,  C_DATA66
  /* 8B */,  C_DATA66
  /* 8C */,  C_DATA66
  /* 8D */,  C_DATA66
  /* 8E */,  C_DATA66
  /* 8F */,  C_DATA66
  /* 90 */,  C_MODRM
  /* 91 */,  C_MODRM
  /* 92 */,  C_MODRM
  /* 93 */,  C_MODRM
  /* 94 */,  C_MODRM
  /* 95 */,  C_MODRM
  /* 96 */,  C_MODRM
  /* 97 */,  C_MODRM
  /* 98 */,  C_MODRM
  /* 99 */,  C_MODRM
  /* 9A */,  C_MODRM
  /* 9B */,  C_MODRM
  /* 9C */,  C_MODRM
  /* 9D */,  C_MODRM
  /* 9E */,  C_MODRM
  /* 9F */,  C_MODRM
  /* A0 */,  0
  /* A1 */,  0
  /* A2 */,  0
  /* A3 */,  C_MODRM
  /* A4 */,  C_MODRM+C_DATA1
  /* A5 */,  C_MODRM
  /* A6 */,  -1
  /* A7 */,  -1
  /* A8 */,  0
  /* A9 */,  0
  /* AA */,  0
  /* AB */,  C_MODRM
  /* AC */,  C_MODRM+C_DATA1
  /* AD */,  C_MODRM
  /* AE */,  -1
  /* AF */,  C_MODRM
  /* B0 */,  C_MODRM
  /* B1 */,  C_MODRM
  /* B2 */,  C_MODRM
  /* B3 */,  C_MODRM
  /* B4 */,  C_MODRM
  /* B5 */,  C_MODRM
  /* B6 */,  C_MODRM
  /* B7 */,  C_MODRM
  /* B8 */,  -1
  /* B9 */,  -1
  /* BA */,  C_MODRM+C_DATA1
  /* BB */,  C_MODRM
  /* BC */,  C_MODRM
  /* BD */,  C_MODRM
  /* BE */,  C_MODRM
  /* BF */,  C_MODRM
  /* C0 */,  C_MODRM
  /* C1 */,  C_MODRM
  /* C2 */,  -1
  /* C3 */,  -1
  /* C4 */,  -1
  /* C5 */,  -1
  /* C6 */,  -1
  /* C7 */,  -1
  /* C8 */,  0
  /* C9 */,  0
  /* CA */,  0
  /* CB */,  0
  /* CC */,  0
  /* CD */,  0
  /* CE */,  0
  /* CF */,  0
  /* D0 */,  -1
  /* D1 */,  -1
  /* D2 */,  -1
  /* D3 */,  -1
  /* D4 */,  -1
  /* D5 */,  -1
  /* D6 */,  -1
  /* D7 */,  -1
  /* D8 */,  -1
  /* D9 */,  -1
  /* DA */,  -1
  /* DB */,  -1
  /* DC */,  -1
  /* DD */,  -1
  /* DE */,  -1
  /* DF */,  -1
  /* E0 */,  -1
  /* E1 */,  -1
  /* E2 */,  -1
  /* E3 */,  -1
  /* E4 */,  -1
  /* E5 */,  -1
  /* E6 */,  -1
  /* E7 */,  -1
  /* E8 */,  -1
  /* E9 */,  -1
  /* EA */,  -1
  /* EB */,  -1
  /* EC */,  -1
  /* ED */,  -1
  /* EE */,  -1
  /* EF */,  -1
  /* F0 */,  -1
  /* F1 */,  -1
  /* F2 */,  -1
  /* F3 */,  -1
  /* F4 */,  -1
  /* F5 */,  -1
  /* F6 */,  -1
  /* F7 */,  -1
  /* F8 */,  -1
  /* F9 */,  -1
  /* FA */,  -1
  /* FB */,  -1
  /* FC */,  -1
  /* FD */,  -1
  /* FE */,  -1
  /* FF */,  -1
}; // table_0F

  BYTE* iptr = iptr0;
  BYTE b, mod, rm;
  DWORD f = 0;

prefix:
  b = *iptr++;

  f |= table_1[b];

  if (f&C_FUCKINGTEST)
    if (((*iptr)&0x38)==0x00)   // ttt
      f=C_MODRM+C_DATAW0;       // TEST
    else
      f=C_MODRM;                // NOT,NEG,MUL,IMUL,DIV,IDIV

  if (f&C_TABLE_0F)
  {
    b = *iptr++;
    f = table_0F[b];
  }

  if (f==C_ERROR)
  {
    *osizeptr=C_ERROR;
    return;
  }

  if (f&C_PREFIX)
  {
    f&=~C_PREFIX;
    goto prefix;
  }

  if (f&C_DATAW0) if (b&0x01) f|=C_DATA66; else f|=C_DATA1;

  if (f&C_MODRM)
  {
    b = *iptr++;
    mod = b & 0xC0;
    rm  = b & 0x07;
    if (mod!=0xC0)
    {
      if (f&C_67)         // modrm16
      {
        if ((mod==0x00)&&(rm==0x06)) f|=C_MEM2;
        if (mod==0x40) f|=C_MEM1;
        if (mod==0x80) f|=C_MEM2;
      }
      else                // modrm32
      {
        if (mod==0x40) f|=C_MEM1;
        if (mod==0x80) f|=C_MEM4;
        if (rm==0x04) rm = (*iptr++) & 0x07;    // rm<-sib.base
        if ((rm==0x05)&&(mod==0x00)) f|=C_MEM4;
      }
    }
  } // C_MODRM

  if (f&C_MEM67)  if (f&C_67) f|=C_MEM2;  else f|=C_MEM4;
  if (f&C_DATA66) if (f&C_66) f|=C_DATA2; else f|=C_DATA4;

  if (f&C_MEM1)  iptr++;
  if (f&C_MEM2)  iptr+=2;
  if (f&C_MEM4)  iptr+=4;

  if (f&C_DATA1) iptr++;
  if (f&C_DATA2) iptr+=2;
  if (f&C_DATA4) iptr+=4;

  *osizeptr = iptr - iptr0;
}