2 * Copyright (c) 2008, 2010, 2011, 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #define BYTE_ORDER_H 1
19 #include <arpa/inet.h>
20 #include <sys/types.h>
22 #include "openvswitch/types.h"
26 static inline ovs_be64
29 return htonl(1) == 1 ? n : ((uint64_t) htonl(n) << 32) | htonl(n >> 32);
32 static inline uint64_t
35 return htonl(1) == 1 ? n : ((uint64_t) ntohl(n) << 32) | ntohl(n >> 32);
39 /* Making sparse happy with these functions also makes them unreadable, so
40 * don't bother to show it their implementations. */
41 ovs_be64 htonll(uint64_t);
42 uint64_t ntohll(ovs_be64);
46 hton128(const ovs_u128 *src, ovs_be128 *dst)
48 dst->be64.hi = htonll(src->u64.hi);
49 dst->be64.lo = htonll(src->u64.lo);
53 ntoh128(const ovs_be128 *src, ovs_u128 *dst)
55 dst->u64.hi = ntohll(src->be64.hi);
56 dst->u64.lo = ntohll(src->be64.lo);
59 static inline uint32_t
60 uint32_byteswap(uint32_t crc) {
61 return (((crc & 0x000000ff) << 24) |
62 ((crc & 0x0000ff00) << 8) |
63 ((crc & 0x00ff0000) >> 8) |
64 ((crc & 0xff000000) >> 24));
67 /* These macros may substitute for htons(), htonl(), and htonll() in contexts
68 * where function calls are not allowed, such as case labels. They should not
69 * be used elsewhere because all of them evaluate their argument many times. */
70 #if defined(WORDS_BIGENDIAN) || __CHECKER__
71 #define CONSTANT_HTONS(VALUE) ((OVS_FORCE ovs_be16) ((VALUE) & 0xffff))
72 #define CONSTANT_HTONL(VALUE) ((OVS_FORCE ovs_be32) ((VALUE) & 0xffffffff))
73 #define CONSTANT_HTONLL(VALUE) \
74 ((OVS_FORCE ovs_be64) ((VALUE) & UINT64_C(0xffffffffffffffff)))
76 #define CONSTANT_HTONS(VALUE) \
77 (((((ovs_be16) (VALUE)) & 0xff00) >> 8) | \
78 ((((ovs_be16) (VALUE)) & 0x00ff) << 8))
79 #define CONSTANT_HTONL(VALUE) \
80 (((((ovs_be32) (VALUE)) & 0x000000ff) << 24) | \
81 ((((ovs_be32) (VALUE)) & 0x0000ff00) << 8) | \
82 ((((ovs_be32) (VALUE)) & 0x00ff0000) >> 8) | \
83 ((((ovs_be32) (VALUE)) & 0xff000000) >> 24))
84 #define CONSTANT_HTONLL(VALUE) \
85 (((((ovs_be64) (VALUE)) & UINT64_C(0x00000000000000ff)) << 56) | \
86 ((((ovs_be64) (VALUE)) & UINT64_C(0x000000000000ff00)) << 40) | \
87 ((((ovs_be64) (VALUE)) & UINT64_C(0x0000000000ff0000)) << 24) | \
88 ((((ovs_be64) (VALUE)) & UINT64_C(0x00000000ff000000)) << 8) | \
89 ((((ovs_be64) (VALUE)) & UINT64_C(0x000000ff00000000)) >> 8) | \
90 ((((ovs_be64) (VALUE)) & UINT64_C(0x0000ff0000000000)) >> 24) | \
91 ((((ovs_be64) (VALUE)) & UINT64_C(0x00ff000000000000)) >> 40) | \
92 ((((ovs_be64) (VALUE)) & UINT64_C(0xff00000000000000)) >> 56))
96 #define BYTES_TO_BE32(B1, B2, B3, B4) \
97 (OVS_FORCE ovs_be32)((uint32_t)(B1) << 24 | (B2) << 16 | (B3) << 8 | (B4))
98 #define BE16S_TO_BE32(B1, B2) \
99 (OVS_FORCE ovs_be32)((uint32_t)(B1) << 16 | (B2))
101 #define BYTES_TO_BE32(B1, B2, B3, B4) \
102 (OVS_FORCE ovs_be32)((uint32_t)(B1) | (B2) << 8 | (B3) << 16 | (B4) << 24)
103 #define BE16S_TO_BE32(B1, B2) \
104 (OVS_FORCE ovs_be32)((uint32_t)(B1) | (B2) << 16)
107 #endif /* byte-order.h */