1 /* 2 * Copyright (c) 2020 Yubico AB. All rights reserved. 3 * Use of this source code is governed by a BSD-style 4 * license that can be found in the LICENSE file. 5 */ 6 7 #include "openbsd-compat.h" 8 9 #if defined(_WIN32) && !defined(HAVE_ENDIAN_H) 10 11 /* 12 * Hopefully, if the endianness differs from the end result, the compiler 13 * optimizes these functions with some type of bswap instruction. Or, 14 * otherwise, to just return the input value unmodified. GCC and clang 15 * both does these optimization at least. This should be preferred over 16 * relying on some BYTE_ORDER macro, which may or may not be defined. 17 */ 18 19 uint32_t 20 htole32(uint32_t in) 21 { 22 uint32_t out = 0; 23 uint8_t *b = (uint8_t *)&out; 24 25 b[0] = (uint8_t)((in >> 0) & 0xff); 26 b[1] = (uint8_t)((in >> 8) & 0xff); 27 b[2] = (uint8_t)((in >> 16) & 0xff); 28 b[3] = (uint8_t)((in >> 24) & 0xff); 29 30 return (out); 31 } 32 33 uint64_t 34 htole64(uint64_t in) 35 { 36 uint64_t out = 0; 37 uint8_t *b = (uint8_t *)&out; 38 39 b[0] = (uint8_t)((in >> 0) & 0xff); 40 b[1] = (uint8_t)((in >> 8) & 0xff); 41 b[2] = (uint8_t)((in >> 16) & 0xff); 42 b[3] = (uint8_t)((in >> 24) & 0xff); 43 b[4] = (uint8_t)((in >> 32) & 0xff); 44 b[5] = (uint8_t)((in >> 40) & 0xff); 45 b[6] = (uint8_t)((in >> 48) & 0xff); 46 b[7] = (uint8_t)((in >> 56) & 0xff); 47 48 return (out); 49 } 50 51 #endif /* WIN32 && !HAVE_ENDIAN_H */ 52