posix/include/psx/safeobj.h

   1 /* $Id: safeobj.h,v 1.2 2002/02/20 09:17:55 hyperion Exp $
   2  */
   3 /*
   4  * psx/safeobj.h
   5  *
   6  * types and definitions for safe checking of user-provided objects
   7  *
   8  * This file is part of the ReactOS Operating System.
   9  *
  10  * Contributors:
  11  *  Created by KJK::Hyperion <noog@libero.it>
  12  *
  13  *  THIS SOFTWARE IS NOT COPYRIGHTED
  14  *
  15  *  This source code is offered for use in the public domain. You may
  16  *  use, modify or distribute it freely.
  17  *
  18  *  This code is distributed in the hope that it will be useful but
  19  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  20  *  DISCLAMED. This includes but is not limited to warranties of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  */
  24 #ifndef __PSX_SAFEOBJ_H_INCLUDED__
  25 #define __PSX_SAFEOBJ_H_INCLUDED__
  26
  27 /* INCLUDES */
  28 #include <inttypes.h>
  29
  30 /* OBJECTS */
  31
  32 /* TYPES */
  33 typedef uint32_t __magic_t;
  34
  35 /* CONSTANTS */
  36
  37 /* PROTOTYPES */
  38 int __safeobj_validate(void *, __magic_t);
  39
  40 /* MACROS */
  41 /* builds a magic number from 4 characters */
  42 #define MAGIC(a,b,c,d) ( \
  43  (((uint32_t)(uint8_t)(a)) << 24) | \
  44  (((uint32_t)(uint8_t)(b)) << 16) | \
  45  (((uint32_t)(uint8_t)(c)) <<  8) | \
  46  (((uint32_t)(uint8_t)(d)) <<  0) \
  47 )
  48
  49 /* retrieves a comma-separated list of the 4 characters in a magic number */
  50 #define MAGIC_DECOMPOSE(m) \
  51  ((uint8_t)(m >> 24)), \
  52  ((uint8_t)(m >> 16)), \
  53  ((uint8_t)(m >>  8)), \
  54  ((uint8_t)(m >>  0))
  55
  56 #endif /* __PSX_SAFEOBJ_H_INCLUDED__ */
  57
  58 /* EOF */
  59