+/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
/***
- This file is part of systemd.
-
Copyright 2014 Tom Gundersen
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <endian.h>
/* BE */
static inline uint16_t unaligned_read_be16(const void *_u) {
- const uint8_t *u = _u;
+ const struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
- return (((uint16_t) u[0]) << 8) |
- ((uint16_t) u[1]);
+ return be16toh(u->x);
}
static inline uint32_t unaligned_read_be32(const void *_u) {
- const uint8_t *u = _u;
+ const struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
- return (((uint32_t) unaligned_read_be16(u)) << 16) |
- ((uint32_t) unaligned_read_be16(u + 2));
+ return be32toh(u->x);
}
static inline uint64_t unaligned_read_be64(const void *_u) {
- const uint8_t *u = _u;
+ const struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
- return (((uint64_t) unaligned_read_be32(u)) << 32) |
- ((uint64_t) unaligned_read_be32(u + 4));
+ return be64toh(u->x);
}
static inline void unaligned_write_be16(void *_u, uint16_t a) {
- uint8_t *u = _u;
+ struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
- u[0] = (uint8_t) (a >> 8);
- u[1] = (uint8_t) a;
+ u->x = be16toh(a);
}
static inline void unaligned_write_be32(void *_u, uint32_t a) {
- uint8_t *u = _u;
+ struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
- unaligned_write_be16(u, (uint16_t) (a >> 16));
- unaligned_write_be16(u + 2, (uint16_t) a);
+ u->x = be32toh(a);
}
static inline void unaligned_write_be64(void *_u, uint64_t a) {
- uint8_t *u = _u;
+ struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
- unaligned_write_be32(u, (uint32_t) (a >> 32));
- unaligned_write_be32(u + 4, (uint32_t) a);
+ u->x = be64toh(a);
}
/* LE */
static inline uint16_t unaligned_read_le16(const void *_u) {
- const uint8_t *u = _u;
+ const struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
- return (((uint16_t) u[1]) << 8) |
- ((uint16_t) u[0]);
+ return le16toh(u->x);
}
static inline uint32_t unaligned_read_le32(const void *_u) {
- const uint8_t *u = _u;
+ const struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
- return (((uint32_t) unaligned_read_le16(u + 2)) << 16) |
- ((uint32_t) unaligned_read_le16(u));
+ return le32toh(u->x);
}
static inline uint64_t unaligned_read_le64(const void *_u) {
- const uint8_t *u = _u;
+ const struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
- return (((uint64_t) unaligned_read_le32(u + 4)) << 32) |
- ((uint64_t) unaligned_read_le32(u));
+ return le64toh(u->x);
}
static inline void unaligned_write_le16(void *_u, uint16_t a) {
- uint8_t *u = _u;
+ struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
- u[0] = (uint8_t) a;
- u[1] = (uint8_t) (a >> 8);
+ u->x = le16toh(a);
}
static inline void unaligned_write_le32(void *_u, uint32_t a) {
- uint8_t *u = _u;
+ struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
- unaligned_write_le16(u, (uint16_t) a);
- unaligned_write_le16(u + 2, (uint16_t) (a >> 16));
+ u->x = le32toh(a);
}
static inline void unaligned_write_le64(void *_u, uint64_t a) {
- uint8_t *u = _u;
+ struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
- unaligned_write_le32(u, (uint32_t) a);
- unaligned_write_le32(u + 4, (uint32_t) (a >> 32));
+ u->x = le64toh(a);
}
#if __BYTE_ORDER == __BIG_ENDIAN