exehdr.h

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/*
 *      Interactive disassembler (IDA).
 *      Copyright (c) 1990-2025 Hex-Rays
 *      ALL RIGHTS RESERVED.
 *
 *              EXE-file header layout
 *
 */
 
#ifndef __EXEHDR_H
#define __EXEHDR_H
#pragma pack(push, 1)
 
struct exehdr
{
  uint16 exe_ident;
#define EXE_ID  0x5A4D          // 'MZ'
#define EXE_ID2 0x4D5A          // 'ZM' (DOS works with this also)
  uint16 PartPag;
  uint16 PageCnt;
  uint16 ReloCnt;
  uint16 HdrSize;
  uint16 MinMem;
  uint16 MaxMem;
  uint16 ReloSS;
  uint16 ExeSP;
  uint16 ChkSum;
  uint16 ExeIP;
  uint16 ReloCS;
  uint16 TablOff;
  uint16 Overlay;
/*
  uint16 res[4];                    // Reserved words
  uint16 oemid;                     // OEM identifier (for e_oeminfo)
  uint16 oeminfo;                   // OEM information; e_oemid specific
  uint16 res2[10];                  // Reserved words
  uint32 lfanew;                    // File address of new exe header
*/
  int32 CalcEXE_Length(void)
  {
    int32 len = PageCnt * 512 - HdrSize * 16;
    if ( PartPag != 0 )
      len -= 512 - PartPag;
    return len;
  }
  void CalcEXE_Pages(int32 len)
  {
    PartPag = uint16(len % 512);
    PageCnt = uint16(len / 512);
    if ( PartPag != 0 )
      PageCnt++;
  }
};
 
struct exehdr_full: exehdr
{
  uint16 res[4];                    // Reserved words
  uint16 oemid;                     // OEM identifier (for e_oeminfo)
  uint16 oeminfo;                   // OEM information; e_oemid specific
  uint16 res2[10];                  // Reserved words
  uint32 lfanew;                    // File address of new exe header
};
 
#define PSPsize 0x100
#define PE_PTROFF 0x3C
#pragma pack(pop)
#endif