ByteOrder.h revision 44ec21c3
1/*
2 * Copyright 2007, Haiku, Inc. All Rights Reserved.
3 * Distributed under the terms of the MIT License.
4 */
5#ifndef _BYTEORDER_H
6#define _BYTEORDER_H
7
8
9#include <BeBuild.h>
10#include <endian.h>
11#include <SupportDefs.h>
12#include <TypeConstants.h>
13	/* for convenience */
14
15
16/* swap directions */
17typedef enum {
18	B_SWAP_HOST_TO_LENDIAN,
19	B_SWAP_HOST_TO_BENDIAN,
20	B_SWAP_LENDIAN_TO_HOST,
21	B_SWAP_BENDIAN_TO_HOST,
22	B_SWAP_ALWAYS
23} swap_action;
24
25
26/* BSD/networking macros */
27#ifndef htonl
28#	define htonl(x) B_HOST_TO_BENDIAN_INT32(x)
29#	define ntohl(x) B_BENDIAN_TO_HOST_INT32(x)
30#	define htons(x) B_HOST_TO_BENDIAN_INT16(x)
31#	define ntohs(x) B_BENDIAN_TO_HOST_INT16(x)
32#endif
33
34/* always swap macros */
35#define B_SWAP_DOUBLE(arg)   __swap_double(arg)
36#define B_SWAP_FLOAT(arg)    __swap_float(arg)
37#define B_SWAP_INT64(arg)    __swap_int64(arg)
38#define B_SWAP_INT32(arg)    __swap_int32(arg)
39#define B_SWAP_INT16(arg)    __swap_int16(arg)
40
41#if BYTE_ORDER == __LITTLE_ENDIAN
42/* Host is little endian */
43
44#define B_HOST_IS_LENDIAN 1
45#define B_HOST_IS_BENDIAN 0
46
47/* Host native to little endian */
48#define B_HOST_TO_LENDIAN_DOUBLE(arg)	(double)(arg)
49#define B_HOST_TO_LENDIAN_FLOAT(arg)	(float)(arg)
50#define B_HOST_TO_LENDIAN_INT64(arg)	(uint64)(arg)
51#define B_HOST_TO_LENDIAN_INT32(arg)	(uint32)(arg)
52#define B_HOST_TO_LENDIAN_INT16(arg)	(uint16)(arg)
53
54/* Little endian to host native */
55#define B_LENDIAN_TO_HOST_DOUBLE(arg)	(double)(arg)
56#define B_LENDIAN_TO_HOST_FLOAT(arg)	(float)(arg)
57#define B_LENDIAN_TO_HOST_INT64(arg)	(uint64)(arg)
58#define B_LENDIAN_TO_HOST_INT32(arg)	(uint32)(arg)
59#define B_LENDIAN_TO_HOST_INT16(arg)	(uint16)(arg)
60
61/* Host native to big endian */
62#define B_HOST_TO_BENDIAN_DOUBLE(arg)	__swap_double(arg)
63#define B_HOST_TO_BENDIAN_FLOAT(arg)	__swap_float(arg)
64#define B_HOST_TO_BENDIAN_INT64(arg)	__swap_int64(arg)
65#define B_HOST_TO_BENDIAN_INT32(arg)	__swap_int32(arg)
66#define B_HOST_TO_BENDIAN_INT16(arg)	__swap_int16(arg)
67
68/* Big endian to host native */
69#define B_BENDIAN_TO_HOST_DOUBLE(arg)	__swap_double(arg)
70#define B_BENDIAN_TO_HOST_FLOAT(arg)	__swap_float(arg)
71#define B_BENDIAN_TO_HOST_INT64(arg)	__swap_int64(arg)
72#define B_BENDIAN_TO_HOST_INT32(arg)	__swap_int32(arg)
73#define B_BENDIAN_TO_HOST_INT16(arg)	__swap_int16(arg)
74
75#else	/* BYTE_ORDER */
76/* Host is big endian */
77
78#define B_HOST_IS_LENDIAN 0
79#define B_HOST_IS_BENDIAN 1
80
81/* Host native to little endian */
82#define B_HOST_TO_LENDIAN_DOUBLE(arg)	__swap_double(arg)
83#define B_HOST_TO_LENDIAN_FLOAT(arg)	__swap_float(arg)
84#define B_HOST_TO_LENDIAN_INT64(arg)	__swap_int64(arg)
85#define B_HOST_TO_LENDIAN_INT32(arg)	__swap_int32(arg)
86#define B_HOST_TO_LENDIAN_INT16(arg)	__swap_int16(arg)
87
88/* Little endian to host native */
89#define B_LENDIAN_TO_HOST_DOUBLE(arg)	__swap_double(arg)
90#define B_LENDIAN_TO_HOST_FLOAT(arg)	__swap_float(arg)
91#define B_LENDIAN_TO_HOST_INT64(arg)	__swap_int64(arg)
92#define B_LENDIAN_TO_HOST_INT32(arg)	__swap_int32(arg)
93#define B_LENDIAN_TO_HOST_INT16(arg)	__swap_int16(arg)
94
95/* Host native to big endian */
96#define B_HOST_TO_BENDIAN_DOUBLE(arg)	(double)(arg)
97#define B_HOST_TO_BENDIAN_FLOAT(arg)	(float)(arg)
98#define B_HOST_TO_BENDIAN_INT64(arg)	(uint64)(arg)
99#define B_HOST_TO_BENDIAN_INT32(arg)	(uint32)(arg)
100#define B_HOST_TO_BENDIAN_INT16(arg)	(uint16)(arg)
101
102/* Big endian to host native */
103#define B_BENDIAN_TO_HOST_DOUBLE(arg)	(double)(arg)
104#define B_BENDIAN_TO_HOST_FLOAT(arg)	(float)(arg)
105#define B_BENDIAN_TO_HOST_INT64(arg)	(uint64)(arg)
106#define B_BENDIAN_TO_HOST_INT32(arg)	(uint32)(arg)
107#define B_BENDIAN_TO_HOST_INT16(arg)	(uint16)(arg)
108
109#endif	/* BYTE_ORDER */
110
111
112#ifdef __cplusplus
113extern "C" {
114#endif
115
116extern status_t swap_data(type_code type, void *data, size_t length,
117	swap_action action);
118extern bool is_type_swapped(type_code type);
119
120/* Private implementations */
121extern double __swap_double(double arg);
122extern float  __swap_float(float arg);
123#if __GNUC__ >= 4
124#define __swap_int64(arg)	__builtin_bswap64(arg)
125#define __swap_int32(arg)	__builtin_bswap32(arg)
126#define __swap_int16(arg)	__builtin_bswap16(arg)
127#else
128extern uint64 __swap_int64(uint64 arg);
129extern uint32 __swap_int32(uint32 arg);
130extern uint16 __swap_int16(uint16 arg);
131#endif
132
133#ifdef __cplusplus
134}
135#endif
136
137#endif	/* _BYTEORDER_H */
138