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128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*-
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* Copyright (c) 2015 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SYS_DEV_RANDOM_UINT128_H_INCLUDED
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#define SYS_DEV_RANDOM_UINT128_H_INCLUDED
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#include <sys/endian.h>
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/* This whole thing is a crock :-(
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*
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* Everyone knows you always need the __uint128_t types!
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*/
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#ifdef __SIZEOF_INT128__
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#define USE_REAL_UINT128_T
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#endif
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#ifdef USE_REAL_UINT128_T
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typedef __uint128_t uint128_t;
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#define UINT128_ZERO 0ULL
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#else
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typedef struct {
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/* Ignore endianness */
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uint64_t u128t_word0;
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uint64_t u128t_word1;
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} uint128_t;
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static const uint128_t very_long_zero = {0UL,0UL};
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#define UINT128_ZERO very_long_zero
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#endif
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static __inline void
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uint128_increment(uint128_t *big_uintp)
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{
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#ifdef USE_REAL_UINT128_T
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(*big_uintp)++;
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#else
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big_uintp->u128t_word0++;
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if (big_uintp->u128t_word0 == 0UL)
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big_uintp->u128t_word1++;
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#endif
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}
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static __inline void
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uint128_add64(uint128_t *big_uintp, uint64_t add)
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{
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#ifdef USE_REAL_UINT128_T
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(*big_uintp) += add;
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#else
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uint64_t word0p;
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word0p = big_uintp->u128t_word0 + add;
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if (word0p < big_uintp->u128t_word0)
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big_uintp->u128t_word1++;
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big_uintp->u128t_word0 = word0p;
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#endif
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}
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static __inline bool
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uint128_equals(uint128_t a, uint128_t b)
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{
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#ifdef USE_REAL_UINT128_T
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return (a == b);
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#else
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return (a.u128t_word0 == b.u128t_word0 &&
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a.u128t_word1 == b.u128t_word1);
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#endif
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}
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static __inline int
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uint128_is_zero(uint128_t big_uint)
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{
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return (uint128_equals(big_uint, UINT128_ZERO));
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}
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static __inline uint128_t
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le128dec(const void *pp)
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{
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const uint8_t *p = pp;
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#ifdef USE_REAL_UINT128_T
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return (((uint128_t)le64dec(p + 8) << 64) | le64dec(p));
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#else
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return ((uint128_t){
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.u128t_word0 = le64dec(p),
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.u128t_word1 = le64dec(p + 8),
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});
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#endif
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}
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static __inline void
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le128enc(void *pp, uint128_t u)
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{
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uint8_t *p = pp;
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#ifdef USE_REAL_UINT128_T
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le64enc(p, (uint64_t)(u & UINT64_MAX));
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le64enc(p + 8, (uint64_t)(u >> 64));
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#else
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le64enc(p, u.u128t_word0);
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le64enc(p + 8, u.u128t_word1);
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#endif
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}
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#endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */
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