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#include <features.h>
11#include <stdint.h>
12
13
14#ifdef _DEFAULT_SOURCE
15
16#include <config/HaikuConfig.h>
17
18#if __GNUC__ < 4
19#include <support/ByteOrder.h>
20#include <support/SupportDefs.h>
21#endif
22
23#ifdef __cplusplus
24extern "C" {
25#endif
26
27/*
28 * General byte order swapping functions.
29 */
30#if __GNUC__ >= 4
31#define bswap16(x) __builtin_bswap16(x)
32#define bswap32(x) __builtin_bswap32(x)
33#define bswap64(x) __builtin_bswap64(x)
34#else
35#define bswap16(x) __swap_int16(x)
36#define bswap32(x) __swap_int32(x)
37#define bswap64(x) __swap_int64(x)
38#endif
39
40/*
41 * Host to big endian, host to little endian, big endian to host, and little
42 * endian to host byte order functions as detailed in byteorder(9).
43 */
44#if BYTE_ORDER == LITTLE_ENDIAN
45#define	htobe16(x)	bswap16((x))
46#define	htobe32(x)	bswap32((x))
47#define	htobe64(x)	bswap64((x))
48#define	htole16(x)	((uint16_t)(x))
49#define	htole32(x)	((uint32_t)(x))
50#define	htole64(x)	((uint64_t)(x))
51
52#define	be16toh(x)	bswap16((x))
53#define	be32toh(x)	bswap32((x))
54#define	be64toh(x)	bswap64((x))
55#define	le16toh(x)	((uint16_t)(x))
56#define	le32toh(x)	((uint32_t)(x))
57#define	le64toh(x)	((uint64_t)(x))
58#else /* BYTE_ORDER != LITTLE_ENDIAN */
59#define	htobe16(x)	((uint16_t)(x))
60#define	htobe32(x)	((uint32_t)(x))
61#define	htobe64(x)	((uint64_t)(x))
62#define	htole16(x)	bswap16((x))
63#define	htole32(x)	bswap32((x))
64#define	htole64(x)	bswap64((x))
65
66#define	be16toh(x)	((uint16_t)(x))
67#define	be32toh(x)	((uint32_t)(x))
68#define	be64toh(x)	((uint64_t)(x))
69#define	le16toh(x)	bswap16((x))
70#define	le32toh(x)	bswap32((x))
71#define	le64toh(x)	bswap64((x))
72#endif /* BYTE_ORDER == LITTLE_ENDIAN */
73
74/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
75
76static __inline uint32_t
77be32dec(const void *pp)
78{
79	uint8_t const *p = (uint8_t const *)pp;
80
81	return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
82}
83
84static __inline uint64_t
85be64dec(const void *pp)
86{
87	uint8_t const *p = (uint8_t const *)pp;
88
89	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
90}
91
92static __inline void
93be32enc(void *pp, uint32_t u)
94{
95	uint8_t *p = (uint8_t *)pp;
96
97	p[0] = (u >> 24) & 0xff;
98	p[1] = (u >> 16) & 0xff;
99	p[2] = (u >> 8) & 0xff;
100	p[3] = u & 0xff;
101}
102
103static __inline void
104be64enc(void *pp, uint64_t u)
105{
106	uint8_t *p = (uint8_t *)pp;
107
108	be32enc(p, (uint32_t)(u >> 32));
109	be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
110}
111
112#ifdef __cplusplus
113}
114#endif
115
116
117#endif
118
119
120#endif	/* _BSD_ENDIAN_H_ */
121