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endianess.h
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1 
19 #ifndef __ENDIANESS_HANDLER__
20 
21  /* The following is based on xorg/xserver/GL/glx/glxbyteorder.h
22  * which is (c) IBM Corp. 2006,2007 and originally licensed under the following
23  * BSD-license. All modifications in navit are licensed under the GNU GPL as
24  * described in file "COPYRIGHT".
25  *
26  * Portions also from GNU C Library include/bits/byteswap.h Also licsend
27  * under the GPL.
28  *
29  * --------------------------
30  * Permission is hereby granted, free of charge, to any person obtaining a
31  * copy of this software and associated documentation files (the "Software"),
32  * to deal in the Software without restriction, including without limitation
33  * the rights to use, copy, modify, merge, publish, distribute, sub license,
34  * and/or sell copies of the Software, and to permit persons to whom the
35  * Software is furnished to do so, subject to the following conditions:
36  *
37  * The above copyright notice and this permission notice (including the next
38  * paragraph) shall be included in all copies or substantial portions of the
39  * Software.
40  *
41  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
42  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
43  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
44  * THE COPYRIGHT HOLDERS, THE AUTHORS, AND/OR THEIR SUPPLIERS BE LIABLE FOR
45  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
46  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
47  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
48  */
49 #if HAVE_BYTESWAP_H
50  /* machine dependent versions of byte swapping functions. GNU extension.*/
51  #include <byteswap.h>
52 #if HAVE_ENDIAN_H
53  #include <endian.h>
54 #endif
55 #elif defined(USE_SYS_ENDIAN_H)
56  #include <sys/endian.h>
57 #if defined(_BYTE_ORDER) && !defined(__BYTE_ORDER)
58 #define __BYTE_ORDER _BYTE_ORDER
59 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
60 #define __BIG_ENDIAN _BIG_ENDIAN
61 #endif
62 #elif defined(__APPLE__)
63  #include <libkern/OSByteOrder.h>
64  #define __bswap_16 OSSwapInt16
65  #define __bswap_32 OSSwapInt32
66  #define __bswap_64 OSSwapInt64
67 
68 #ifndef __BYTE_ORDER
69  #define __LITTLE_ENDIAN 1234
70  #define __BIG_ENDIAN 4321
71 
72  #if defined(__LITTLE_ENDIAN__)
73  #define __BYTE_ORDER __LITTLE_ENDIAN
74  #elif defined(__BIG_ENDIAN__)
75  #define __BYTE_ORDER __BIG_ENDIAN
76  #else
77  #error "No endianness defined for Mac OS!"
78  #endif
79 #endif
80 
81 #elif defined(_WIN32) || defined(__CEGCC__)
82  #define __BIG_ENDIAN 4321
83  #define __LITTLE_ENDIAN 1234
84  #define __BYTE_ORDER __LITTLE_ENDIAN
85 #else
86  #define __bswap_16(__bsx) ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8))
87  #define __bswap_32(__bsx) ((((__bsx) & 0xff000000) >> 24) | \
88  (((__bsx) & 0x00ff0000) >> 8) |\
89  (((__bsx) & 0x0000ff00) << 8) | \
90  (((__bsx) & 0x000000ff) << 24))
91 
92 
93 #endif
94 
95 #if __BYTE_ORDER == __BIG_ENDIAN
96  #define le16_to_cpu(x) __bswap_16 (x)
97  #define le32_to_cpu(x) __bswap_32 (x)
98  #define le64_to_cpu(x) __bswap_64 (x)
99  #define cpu_to_le16(x) __bswap_16 (x)
100  #define cpu_to_le32(x) __bswap_32 (x)
101  #define cpu_to_le64(x) __bswap_64 (x)
102 #elif __BYTE_ORDER == __LITTLE_ENDIAN
103  #define le16_to_cpu(x) (x)
104  #define le32_to_cpu(x) (x)
105  #define cpu_to_le16(x) (x)
106  #define cpu_to_le32(x) (x)
107 #else
108  #error "Unknown endianess"
109 #endif
110 
111 #define __ENDIANESS_HANDLER__
112 #endif
113