1 /*- 2 * Copyright (c) 2015 Mark R V Murray 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef SYS_DEV_RANDOM_UINT128_H_INCLUDED 28 #define SYS_DEV_RANDOM_UINT128_H_INCLUDED 29 30 #include <sys/endian.h> 31 32 /* This whole thing is a crock :-( 33 * 34 * Everyone knows you always need the __uint128_t types! 35 */ 36 37 #ifdef __SIZEOF_INT128__ 38 #define USE_REAL_UINT128_T 39 #endif 40 41 #ifdef USE_REAL_UINT128_T 42 typedef __uint128_t uint128_t; 43 #define UINT128_ZERO 0ULL 44 #else 45 typedef struct { 46 /* Ignore endianness */ 47 uint64_t u128t_word0; 48 uint64_t u128t_word1; 49 } uint128_t; 50 static const uint128_t very_long_zero = {0UL,0UL}; 51 #define UINT128_ZERO very_long_zero 52 #endif 53 54 static __inline void 55 uint128_increment(uint128_t *big_uintp) 56 { 57 #ifdef USE_REAL_UINT128_T 58 (*big_uintp)++; 59 #else 60 big_uintp->u128t_word0++; 61 if (big_uintp->u128t_word0 == 0UL) 62 big_uintp->u128t_word1++; 63 #endif 64 } 65 66 static __inline void 67 uint128_add64(uint128_t *big_uintp, uint64_t add) 68 { 69 #ifdef USE_REAL_UINT128_T 70 (*big_uintp) += add; 71 #else 72 uint64_t word0p; 73 74 word0p = big_uintp->u128t_word0 + add; 75 if (word0p < big_uintp->u128t_word0) 76 big_uintp->u128t_word1++; 77 big_uintp->u128t_word0 = word0p; 78 #endif 79 } 80 81 static __inline bool 82 uint128_equals(uint128_t a, uint128_t b) 83 { 84 #ifdef USE_REAL_UINT128_T 85 return (a == b); 86 #else 87 return (a.u128t_word0 == b.u128t_word0 && 88 a.u128t_word1 == b.u128t_word1); 89 #endif 90 } 91 92 static __inline int 93 uint128_is_zero(uint128_t big_uint) 94 { 95 return (uint128_equals(big_uint, UINT128_ZERO)); 96 } 97 98 static __inline uint128_t 99 le128dec(const void *pp) 100 { 101 const uint8_t *p = pp; 102 103 #ifdef USE_REAL_UINT128_T 104 return (((uint128_t)le64dec(p + 8) << 64) | le64dec(p)); 105 #else 106 return ((uint128_t){ 107 .u128t_word0 = le64dec(p), 108 .u128t_word1 = le64dec(p + 8), 109 }); 110 #endif 111 } 112 113 static __inline void 114 le128enc(void *pp, uint128_t u) 115 { 116 uint8_t *p = pp; 117 118 #ifdef USE_REAL_UINT128_T 119 le64enc(p, (uint64_t)(u & UINT64_MAX)); 120 le64enc(p + 8, (uint64_t)(u >> 64)); 121 #else 122 le64enc(p, u.u128t_word0); 123 le64enc(p + 8, u.u128t_word1); 124 #endif 125 } 126 127 #endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */ 128