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  1. // Emacs style mode select   -*- C++ -*-
  2. //-----------------------------------------------------------------------------
  3. //
  4. // $Id:$
  5. //
  6. // Copyright (C) 1993-1996 by id Software, Inc.
  7. //
  8. // This source is available for distribution and/or modification
  9. // only under the terms of the DOOM Source Code License as
  10. // published by id Software. All rights reserved.
  11. //
  12. // The source is distributed in the hope that it will be useful,
  13. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
  15. // for more details.
  16. //
  17. // $Log:$
  18. //
  19. // DESCRIPTION:
  20. //      Cheat sequence checking.
  21. //
  22. //-----------------------------------------------------------------------------
  23.  
  24.  
  25. static const char
  26. rcsid[] = "$Id: m_cheat.c,v 1.1 1997/02/03 21:24:34 b1 Exp $";
  27.  
  28. #include "m_cheat.h"
  29.  
  30. //
  31. // CHEAT SEQUENCE PACKAGE
  32. //
  33.  
  34. static int              firsttime = 1;
  35. static unsigned char    cheat_xlate_table[256];
  36.  
  37.  
  38. //
  39. // Called in st_stuff module, which handles the input.
  40. // Returns a 1 if the cheat was successful, 0 if failed.
  41. //
  42. int
  43. cht_CheckCheat
  44. ( cheatseq_t*   cht,
  45.   char          key )
  46. {
  47.     int i;
  48.     int rc = 0;
  49.  
  50.     if (firsttime)
  51.     {
  52.         firsttime = 0;
  53.         for (i=0;i<256;i++) cheat_xlate_table[i] = SCRAMBLE(i);
  54.     }
  55.  
  56.     if (!cht->p)
  57.         cht->p = cht->sequence; // initialize if first time
  58.  
  59.     if (*cht->p == 0)
  60.         *(cht->p++) = key;
  61.     else if
  62.         (cheat_xlate_table[(unsigned char)key] == *cht->p) cht->p++;
  63.     else
  64.         cht->p = cht->sequence;
  65.  
  66.     if (*cht->p == 1)
  67.         cht->p++;
  68.     else if (*cht->p == 0xff) // end of sequence character
  69.     {
  70.         cht->p = cht->sequence;
  71.         rc = 1;
  72.     }
  73.  
  74.     return rc;
  75. }
  76.  
  77. void
  78. cht_GetParam
  79. ( cheatseq_t*   cht,
  80.   char*         buffer )
  81. {
  82.  
  83.     unsigned char *p, c;
  84.  
  85.     p = cht->sequence;
  86.     while (*(p++) != 1);
  87.    
  88.     do
  89.     {
  90.         c = *p;
  91.         *(buffer++) = c;
  92.         *(p++) = 0;
  93.     }
  94.     while (c && *p!=0xff );
  95.  
  96.     if (*p==0xff)
  97.         *buffer = 0;
  98.  
  99. }
  100.  
  101.  
  102.