endian.h revision 3d61d207
1/*
2 * Copyright 2017 Haiku, Inc. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 */
5#ifndef _BSD_ENDIAN_H_
6#define _BSD_ENDIAN_H_
7
8
9#include_next <endian.h>
10
11
12#ifdef _BSD_SOURCE
13
14#include <config/HaikuConfig.h>
15#include <support/ByteOrder.h>
16#include <support/SupportDefs.h>
17
18#ifdef __cplusplus
19extern "C" {
20#endif
21
22/*
23 * General byte order swapping functions.
24 */
25#define	bswap16(x)	__swap_int16(x)
26#define	bswap32(x)	__swap_int32(x)
27#define	bswap64(x)	__swap_int64(x)
28
29/*
30 * Host to big endian, host to little endian, big endian to host, and little
31 * endian to host byte order functions as detailed in byteorder(9).
32 */
33#if BYTE_ORDER == LITTLE_ENDIAN
34#define	htobe16(x)	bswap16((x))
35#define	htobe32(x)	bswap32((x))
36#define	htobe64(x)	bswap64((x))
37#define	htole16(x)	((uint16_t)(x))
38#define	htole32(x)	((uint32_t)(x))
39#define	htole64(x)	((uint64_t)(x))
40
41#define	be16toh(x)	bswap16((x))
42#define	be32toh(x)	bswap32((x))
43#define	be64toh(x)	bswap64((x))
44#define	le16toh(x)	((uint16_t)(x))
45#define	le32toh(x)	((uint32_t)(x))
46#define	le64toh(x)	((uint64_t)(x))
47#else /* BYTE_ORDER != LITTLE_ENDIAN */
48#define	htobe16(x)	((uint16_t)(x))
49#define	htobe32(x)	((uint32_t)(x))
50#define	htobe64(x)	((uint64_t)(x))
51#define	htole16(x)	bswap16((x))
52#define	htole32(x)	bswap32((x))
53#define	htole64(x)	bswap64((x))
54
55#define	be16toh(x)	((uint16_t)(x))
56#define	be32toh(x)	((uint32_t)(x))
57#define	be64toh(x)	((uint64_t)(x))
58#define	le16toh(x)	bswap16((x))
59#define	le32toh(x)	bswap32((x))
60#define	le64toh(x)	bswap64((x))
61#endif /* BYTE_ORDER == LITTLE_ENDIAN */
62
63/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
64
65static __inline uint32_t
66be32dec(const void *pp)
67{
68	uint8_t const *p = (uint8_t const *)pp;
69
70	return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
71}
72
73static __inline uint64_t
74be64dec(const void *pp)
75{
76	uint8_t const *p = (uint8_t const *)pp;
77
78	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
79}
80
81static __inline void
82be32enc(void *pp, uint32_t u)
83{
84	uint8_t *p = (uint8_t *)pp;
85
86	p[0] = (u >> 24) & 0xff;
87	p[1] = (u >> 16) & 0xff;
88	p[2] = (u >> 8) & 0xff;
89	p[3] = u & 0xff;
90}
91
92static __inline void
93be64enc(void *pp, uint64_t u)
94{
95	uint8_t *p = (uint8_t *)pp;
96
97	be32enc(p, (uint32_t)(u >> 32));
98	be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
99}
100
101#ifdef __cplusplus
102}
103#endif
104
105
106#endif
107
108
109#endif	/* _BSD_ENDIAN_H_ */
110