diff options
Diffstat (limited to 'openbsd-compat/endian_win32.c')
| -rw-r--r-- | openbsd-compat/endian_win32.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/openbsd-compat/endian_win32.c b/openbsd-compat/endian_win32.c new file mode 100644 index 0000000..756c0cb --- /dev/null +++ b/openbsd-compat/endian_win32.c @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2020 Yubico AB. All rights reserved. + * Use of this source code is governed by a BSD-style + * license that can be found in the LICENSE file. + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include "openbsd-compat.h" + +#if defined(_WIN32) && !defined(HAVE_ENDIAN_H) + +/* + * Hopefully, if the endianness differs from the end result, the compiler + * optimizes these functions with some type of bswap instruction. Or, + * otherwise, to just return the input value unmodified. GCC and clang + * both does these optimization at least. This should be preferred over + * relying on some BYTE_ORDER macro, which may or may not be defined. + */ + +uint32_t +htole32(uint32_t in) +{ + uint32_t out = 0; + uint8_t *b = (uint8_t *)&out; + + b[0] = (uint8_t)((in >> 0) & 0xff); + b[1] = (uint8_t)((in >> 8) & 0xff); + b[2] = (uint8_t)((in >> 16) & 0xff); + b[3] = (uint8_t)((in >> 24) & 0xff); + + return (out); +} + +uint64_t +htole64(uint64_t in) +{ + uint64_t out = 0; + uint8_t *b = (uint8_t *)&out; + + b[0] = (uint8_t)((in >> 0) & 0xff); + b[1] = (uint8_t)((in >> 8) & 0xff); + b[2] = (uint8_t)((in >> 16) & 0xff); + b[3] = (uint8_t)((in >> 24) & 0xff); + b[4] = (uint8_t)((in >> 32) & 0xff); + b[5] = (uint8_t)((in >> 40) & 0xff); + b[6] = (uint8_t)((in >> 48) & 0xff); + b[7] = (uint8_t)((in >> 56) & 0xff); + + return (out); +} + +#endif /* WIN32 && !HAVE_ENDIAN_H */ |