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      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  * SPDX-License-Identifier: BSD-2-Clause
      6  */
      7 
      8 #include "openbsd-compat.h"
      9 
     10 #if defined(_WIN32) && !defined(HAVE_ENDIAN_H)
     11 
     12 /*
     13  * Hopefully, if the endianness differs from the end result, the compiler
     14  * optimizes these functions with some type of bswap instruction. Or,
     15  * otherwise, to just return the input value unmodified. GCC and clang
     16  * both does these optimization at least. This should be preferred over
     17  * relying on some BYTE_ORDER macro, which may or may not be defined.
     18  */
     19 
     20 uint32_t
     21 htole32(uint32_t in)
     22 {
     23 	uint32_t	 out = 0;
     24 	uint8_t		*b = (uint8_t *)&out;
     25 
     26 	b[0] = (uint8_t)((in >> 0)  & 0xff);
     27 	b[1] = (uint8_t)((in >> 8)  & 0xff);
     28 	b[2] = (uint8_t)((in >> 16) & 0xff);
     29 	b[3] = (uint8_t)((in >> 24) & 0xff);
     30 
     31 	return (out);
     32 }
     33 
     34 uint64_t
     35 htole64(uint64_t in)
     36 {
     37 	uint64_t	 out = 0;
     38 	uint8_t		*b = (uint8_t *)&out;
     39 
     40 	b[0] = (uint8_t)((in >> 0)  & 0xff);
     41 	b[1] = (uint8_t)((in >> 8)  & 0xff);
     42 	b[2] = (uint8_t)((in >> 16) & 0xff);
     43 	b[3] = (uint8_t)((in >> 24) & 0xff);
     44 	b[4] = (uint8_t)((in >> 32) & 0xff);
     45 	b[5] = (uint8_t)((in >> 40) & 0xff);
     46 	b[6] = (uint8_t)((in >> 48) & 0xff);
     47 	b[7] = (uint8_t)((in >> 56) & 0xff);
     48 
     49 	return (out);
     50 }
     51 
     52 #endif /* WIN32 && !HAVE_ENDIAN_H */
     53