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      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 
     86