3 Endianness stuff. exFAT uses little-endian byte order.
5 Copyright (C) 2010-2012 Andrew Nayenko
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #ifndef BYTEORDER_H_INCLUDED
22 #define BYTEORDER_H_INCLUDED
26 #if defined(__GLIBC__)
31 #elif defined(__APPLE__)
33 #include <machine/endian.h>
34 #include <libkern/OSByteOrder.h>
35 #define bswap_16(x) OSSwapInt16(x)
36 #define bswap_32(x) OSSwapInt32(x)
37 #define bswap_64(x) OSSwapInt64(x)
38 #define __BYTE_ORDER BYTE_ORDER
39 #define __LITTLE_ENDIAN LITTLE_ENDIAN
40 #define __BIG_ENDIAN BIG_ENDIAN
42 #elif defined(__FreeBSD__) || defined(__DragonFlyBSD__) || defined(__NetBSD__)
44 #include <sys/endian.h>
45 #define bswap_16(x) bswap16(x)
46 #define bswap_32(x) bswap32(x)
47 #define bswap_64(x) bswap64(x)
48 #define __BYTE_ORDER _BYTE_ORDER
49 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
50 #define __BIG_ENDIAN _BIG_ENDIAN
52 #elif defined(__OpenBSD__)
54 #include <machine/endian.h>
55 #define bswap_16(x) swap16(x)
56 #define bswap_32(x) swap32(x)
57 #define bswap_64(x) swap64(x)
58 #define __BYTE_ORDER _BYTE_ORDER
59 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
60 #define __BIG_ENDIAN _BIG_ENDIAN
64 #include <sys/byteorder.h>
65 #define bswap_16(x) BSWAP_16(x)
66 #define bswap_32(x) BSWAP_32(x)
67 #define bswap_64(x) BSWAP_64(x)
68 #define __LITTLE_ENDIAN 1234
69 #define __BIG_ENDIAN 4321
71 #define __BYTE_ORDER __LITTLE_ENDIAN
73 #define __BYTE_ORDER __BIG_ENDIAN
77 #error No byte order macros available for your platform
80 typedef struct { uint16_t __u16; } le16_t;
81 typedef struct { uint32_t __u32; } le32_t;
82 typedef struct { uint64_t __u64; } le64_t;
84 #if __BYTE_ORDER == __LITTLE_ENDIAN
85 static inline uint16_t le16_to_cpu(le16_t v) { return v.__u16; }
86 static inline uint32_t le32_to_cpu(le32_t v) { return v.__u32; }
87 static inline uint64_t le64_to_cpu(le64_t v) { return v.__u64; }
89 static inline le16_t cpu_to_le16(uint16_t v) { le16_t t = {v}; return t; }
90 static inline le32_t cpu_to_le32(uint32_t v) { le32_t t = {v}; return t; }
91 static inline le64_t cpu_to_le64(uint64_t v) { le64_t t = {v}; return t; }
92 #elif __BYTE_ORDER == __BIG_ENDIAN
93 static inline uint16_t le16_to_cpu(le16_t v) { return bswap_16(v.__u16); }
94 static inline uint32_t le32_to_cpu(le32_t v) { return bswap_32(v.__u32); }
95 static inline uint64_t le64_to_cpu(le64_t v) { return bswap_64(v.__u64); }
97 static inline le16_t cpu_to_le16(uint16_t v)
98 { le16_t t = {bswap_16(v)}; return t; }
99 static inline le32_t cpu_to_le32(uint32_t v)
100 { le32_t t = {bswap_32(v)}; return t; }
101 static inline le64_t cpu_to_le64(uint64_t v)
102 { le64_t t = {bswap_64(v)}; return t; }
104 #error Wow! You have a PDP machine?!
107 #endif /* ifndef BYTEORDER_H_INCLUDED */