crypto/openssl/include/internal/numbers.h

   1 /*
   2  * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef OSSL_INTERNAL_NUMBERS_H
  11 # define OSSL_INTERNAL_NUMBERS_H
  12 # pragma once
  13
  14 # include <limits.h>
  15
  16 # if (-1 & 3) == 0x03           /* Two's complement */
  17
  18 #  define __MAXUINT__(T) ((T) -1)
  19 #  define __MAXINT__(T) ((T) ((((T) 1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
  20 #  define __MININT__(T) (-__MAXINT__(T) - 1)
  21
  22 # elif (-1 & 3) == 0x02         /* One's complement */
  23
  24 #  define __MAXUINT__(T) (((T) -1) + 1)
  25 #  define __MAXINT__(T) ((T) ((((T) 1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
  26 #  define __MININT__(T) (-__MAXINT__(T))
  27
  28 # elif (-1 & 3) == 0x01         /* Sign/magnitude */
  29
  30 #  define __MAXINT__(T) ((T) (((((T) 1) << ((sizeof(T) * CHAR_BIT) - 2)) - 1) | (((T) 1) << ((sizeof(T) * CHAR_BIT) - 2))))
  31 #  define __MAXUINT__(T) ((T) (__MAXINT__(T) | (((T) 1) << ((sizeof(T) * CHAR_BIT) - 1))))
  32 #  define __MININT__(T) (-__MAXINT__(T))
  33
  34 # else
  35
  36 #  error "do not know the integer encoding on this architecture"
  37
  38 # endif
  39
  40 # ifndef INT8_MAX
  41 #  define INT8_MIN __MININT__(int8_t)
  42 #  define INT8_MAX __MAXINT__(int8_t)
  43 #  define UINT8_MAX __MAXUINT__(uint8_t)
  44 # endif
  45
  46 # ifndef INT16_MAX
  47 #  define INT16_MIN __MININT__(int16_t)
  48 #  define INT16_MAX __MAXINT__(int16_t)
  49 #  define UINT16_MAX __MAXUINT__(uint16_t)
  50 # endif
  51
  52 # ifndef INT32_MAX
  53 #  define INT32_MIN __MININT__(int32_t)
  54 #  define INT32_MAX __MAXINT__(int32_t)
  55 #  define UINT32_MAX __MAXUINT__(uint32_t)
  56 # endif
  57
  58 # ifndef INT64_MAX
  59 #  define INT64_MIN __MININT__(int64_t)
  60 #  define INT64_MAX __MAXINT__(int64_t)
  61 #  define UINT64_MAX __MAXUINT__(uint64_t)
  62 # endif
  63
  64 # ifndef INT128_MAX
  65 #  if defined(__SIZEOF_INT128__) && __SIZEOF_INT128__ == 16
  66 typedef __int128_t int128_t;
  67 typedef __uint128_t uint128_t;
  68 #   define INT128_MIN __MININT__(int128_t)
  69 #   define INT128_MAX __MAXINT__(int128_t)
  70 #   define UINT128_MAX __MAXUINT__(uint128_t)
  71 #  endif
  72 # endif
  73
  74 # ifndef SIZE_MAX
  75 #  define SIZE_MAX __MAXUINT__(size_t)
  76 # endif
  77
  78 # ifndef OSSL_INTMAX_MAX
  79 #  define OSSL_INTMAX_MIN __MININT__(ossl_intmax_t)
  80 #  define OSSL_INTMAX_MAX __MAXINT__(ossl_intmax_t)
  81 #  define OSSL_UINTMAX_MAX __MAXUINT__(ossl_uintmax_t)
  82 # endif
  83
  84 #endif
  85