text: /*
   * expire - Product expiration (for pre-release versions only)
   */
  
  #include "tweakui.h"
  
  #ifdef	PRERELEASE
  
  #pragma BEGIN_CONST_DATA
  
  /*****************************************************************************
   *
   * Beta passwords
   *
   *  The beta password is simply a CRC32 of the beta ID, using the expiration
   *  date as the seed.
   *
   *****************************************************************************/
  
  ConstString(c_tszBetaID, "BetaID");
  ConstString(c_tszBetaPwd, "BetaPassword");
  ConstString(c_tszBetaExpire, "BetaExpire");
  
  KL const c_klBetaID = { &g_hkLMSMWCV, c_tszAppletTweakUI, c_tszBetaID };
  KL const c_klBetaPwd = { &g_hkLMSMWCV, c_tszAppletTweakUI, c_tszBetaPwd };
  KL const c_klBetaExpire = { &g_hkLMSMWCV, c_tszAppletTweakUI, c_tszBetaExpire };
  
  /*****************************************************************************
   *
   * CRC32 table
   *
   *****************************************************************************/
  
  typedef unsigned long HASH;
  
  HASH const crctab[] = {
    0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL,
    0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L,
    0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L,
    0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L,
  
    0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
    0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L,
    0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL,
    0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L,
  
    0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L,
    0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
    0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L,
    0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L,
  
    0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L,
    0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL,
    0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
    0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL,
  
    0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL,
    0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L,
    0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L,
    0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  
    0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL,
    0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L,
    0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL,
    0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L,
  
    0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
    0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL,
    0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L,
    0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L,
  
    0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L,
    0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
    0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L,
    0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL,
  
    0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL,
    0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L,
    0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
    0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
  
    0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL,
    0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L,
    0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL,
    0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  
    0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L,
    0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL,
    0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L,
    0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L,
  
    0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
    0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL,
    0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L,
    0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL,
  
    0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL,
    0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
    0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L,
    0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L,
  
    0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL,
    0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L,
    0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
    0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L,
  
    0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L,
    0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL,
    0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L,
    0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  
    0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L,
    0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL,
    0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L,
    0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL
  
  };
  
  #pragma END_CONST_DATA
  
  /*****************************************************************************
   *
   *  hashFromHashPtsz
   *
   *  Take a seed and a string and hash them.
   *
   *****************************************************************************/
  
  HASH PASCAL
  hashFromHashPtsz(HASH hash, LPCTSTR ptsz)
  {
      for (; *ptsz; ptsz++) {
  	hash = (hash>>8) ^ crctab[(hash^*ptsz)&0xFF];
      }
      return hash;
  }
  
  /*****************************************************************************
   *
   *  hashFromEncodedPtsz
   *
   *  Take an encoded string and convert it to a hash.  The encoded string
   *  is just a base-26 encoding, with A = 0, ..., Z = 25.
   *
   *****************************************************************************/
  
  HASH PASCAL
  hashFromEncodedPtsz(LPCTSTR ptsz)
  {
      HASH hash = 0;
      for (; *ptsz; ptsz++) {
  	hash = (hash * 26) + (*ptsz - 'A');
      }
      return hash;
  }
  
  /*****************************************************************************
   *
   *  Expire_IsExpiredPwd
   *
   *  Returns nonzero if the password is expired.
   *
   *  The password changes each calendar month.  The seed is the PRERELEASE'th
   *  day of the month.  This ensures that people can't carry beta passwords
   *  across builds.
   *
   *****************************************************************************/
  
  BOOL PASCAL
  Expire_IsExpiredPwd(void)
  {
      TCHAR tszBetaID[256];
      TCHAR tszBetaPwd[256];
      GetStrPkl(tszBetaID, cbX(tszBetaID), &c_klBetaID);
      GetStrPkl(tszBetaPwd, cbX(tszBetaPwd), &c_klBetaPwd);
      if (tszBetaID[0] && tszBetaPwd[0]) {
  	SYSTEMTIME st;
  	GetSystemTime(&st);
  	return hashFromHashPtsz((st.wYear << 16) +
  				    (st.wMonth << 8) + PRERELEASE, tszBetaID) -
  						hashFromEncodedPtsz(tszBetaPwd);
      } else {
  	return 1;
      }
  }
  
  /*****************************************************************************
   *
   *  Expire_OnInitDialog
   *
   *****************************************************************************/
  
  BOOL NEAR PASCAL
  Expire_OnInitDialog(HWND hdlg)
  {
      TCHAR tszBetaID[256];
      DWORD cb = cA(tszBetaID);
      if (GetStrPkl(tszBetaID, cbX(tszBetaID), &c_klBetaID)||
  	GetUserName(tszBetaID, &cb)) {
  	AnsiLower(tszBetaID);
  	SetDlgItemText(hdlg, 32, tszBetaID);
  	SendDlgItemMessage(hdlg, 32, EM_SETREADONLY, 1, 0);
  	SetFocus(GetDlgItem(hdlg, 33));
  	return 0;
      } else {
      }
      return 1;
  }
  
  /*****************************************************************************
   *
   *  Expire_OnCommand
   *
   *****************************************************************************/
  
  void PASCAL
  Expire_OnCommand(HWND hdlg, int id, UINT codeNotify)
  {
      TCHAR tszBetaID[256];
      TCHAR tszBetaPwd[256];
      switch (id) {
      case IDOK:
  	GetDlgItemText(hdlg, 32, tszBetaID, cA(tszBetaID));
  	GetDlgItemText(hdlg, 33, tszBetaPwd, cA(tszBetaPwd));
  	SetStrPkl(&c_klBetaID, tszBetaID);
  	SetStrPkl(&c_klBetaPwd, tszBetaPwd);
  	EndDialog(hdlg, Expire_IsExpiredPwd()); break;
  
      case IDCANCEL:
  	EndDialog(hdlg, 1); break;
  
      }
  }
  
  /*****************************************************************************
   *
   *  Expire_DlgProc
   *
   *****************************************************************************/
  
  BOOL EXPORT
  Expire_DlgProc(HWND hdlg, UINT wm, WPARAM wParam, LPARAM lParam)
  {
      switch (wm) {
      case WM_INITDIALOG: return Expire_OnInitDialog(hdlg);
  
      case WM_COMMAND:
  	Expire_OnCommand(hdlg, (int)GET_WM_COMMAND_ID(wParam, lParam),
  			        (UINT)GET_WM_COMMAND_CMD(wParam, lParam));
  	break;
  
      default: return 0;	/* Unhandled */
      }
      return 1;		/* Handled */
  }
  
  
  /*****************************************************************************
   *
   *  IsExpired
   *
   *  Returns nonzero if this instance has expired.
   *
   *****************************************************************************/
  
  #pragma BEGIN_CONST_DATA
  /*
   *  Simple caesar cipher.  Off-by-one.  We encode the URL so that a casual
   *  reader won't find them.
   *
   *  http://157.55.96.156/tweakrun.html?
   *  http://157.55.96.156/tweakexp.html?
   */
  ConstString(c_tszTweakrun, "iuuq;00268/66/:7/2670uxfblsvo/iunm@");
  ConstString(c_tszTweakexp, "iuuq;00268/66/:7/2670uxfblfyq/iunm@");
  
  #pragma END_CONST_DATA
  
  BOOL PASCAL
  IsExpired(HWND hwnd)
  {
      DWORD dw;
      SYSTEMTIME st;
      FILETIME ft;
      PCTSTR ptszExecMe;
  
      if (Expire_IsExpiredPwd()) {
  	if (DialogBox(hinstCur, MAKEINTRESOURCE(IDD_BETAPASSWORD), hwnd,
  			        Expire_DlgProc)) {
  	    return 1;			/* Expired */
  	}
      }
  
      /*
       *	Not expired.  See if it's time for feedback.
       */
      GetSystemTime(&st);
      SystemTimeToFileTime(&st, &ft);
      dw = GetDwordPkl(&c_klBetaExpire, 0);
      if (dw == 0) {			/* First time */
  	ptszExecMe = c_tszTweakrun;
      } else if (dw < ft.dwHighDateTime) {
  	ptszExecMe = c_tszTweakexp;
      } else {
  	ptszExecMe = 0;
      }
      if (ptszExecMe) {
  	PTSTR ptsz;
  	TCHAR tszURL[cA(c_tszTweakrun) + MAX_PATH + 1 +
  		     MAX_COMPUTERNAME_LENGTH + 1];
  	SetDwordPkl(&c_klBetaExpire, ft.dwHighDateTime + 1408);	/* One week */
  	lstrcpy(tszURL, ptszExecMe);
  	for (ptsz = tszURL; ptsz[0]; ptsz++) {
  	    ptsz[0]--;
  	}
  	GetStrPkl(ptsz, cbCtch(MAX_PATH), &c_klBetaID);
  	lstrcat(ptsz, TEXT("?"));
  	dw = MAX_COMPUTERNAME_LENGTH + 1;
  	GetComputerName(ptsz + lstrlen(ptsz), &dw);
  	ShellExecute(0, 0, tszURL, 0, 0, SW_NORMAL);
      }
      return 0;
  }
  
  #endif	/* PRERELEASE */
  