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33aa579a JK |
1 | #ifndef COMPAT_BSWAP_H |
2 | #define COMPAT_BSWAP_H | |
3 | ||
51ea5519 NP |
4 | /* |
5 | * Let's make sure we always have a sane definition for ntohl()/htonl(). | |
6 | * Some libraries define those as a function call, just to perform byte | |
7 | * shifting, bringing significant overhead to what should be a simple | |
8 | * operation. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * Default version that the compiler ought to optimize properly with | |
13 | * constant values. | |
14 | */ | |
5322ef20 | 15 | static inline uint32_t default_swab32(uint32_t val) |
51ea5519 NP |
16 | { |
17 | return (((val & 0xff000000) >> 24) | | |
18 | ((val & 0x00ff0000) >> 8) | | |
19 | ((val & 0x0000ff00) << 8) | | |
20 | ((val & 0x000000ff) << 24)); | |
21 | } | |
22 | ||
7e3dae49 VM |
23 | static inline uint64_t default_bswap64(uint64_t val) |
24 | { | |
25 | return (((val & (uint64_t)0x00000000000000ffULL) << 56) | | |
26 | ((val & (uint64_t)0x000000000000ff00ULL) << 40) | | |
27 | ((val & (uint64_t)0x0000000000ff0000ULL) << 24) | | |
28 | ((val & (uint64_t)0x00000000ff000000ULL) << 8) | | |
29 | ((val & (uint64_t)0x000000ff00000000ULL) >> 8) | | |
30 | ((val & (uint64_t)0x0000ff0000000000ULL) >> 24) | | |
31 | ((val & (uint64_t)0x00ff000000000000ULL) >> 40) | | |
32 | ((val & (uint64_t)0xff00000000000000ULL) >> 56)); | |
33 | } | |
34 | ||
21e403a7 | 35 | #undef bswap32 |
7e3dae49 | 36 | #undef bswap64 |
21e403a7 | 37 | |
51ea5519 NP |
38 | #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) |
39 | ||
c6c8d0b7 JN |
40 | #define bswap32 git_bswap32 |
41 | static inline uint32_t git_bswap32(uint32_t x) | |
42 | { | |
43 | uint32_t result; | |
44 | if (__builtin_constant_p(x)) | |
45 | result = default_swab32(x); | |
46 | else | |
47 | __asm__("bswap %0" : "=r" (result) : "0" (x)); | |
48 | return result; | |
49 | } | |
51ea5519 | 50 | |
7e3dae49 VM |
51 | #define bswap64 git_bswap64 |
52 | #if defined(__x86_64__) | |
53 | static inline uint64_t git_bswap64(uint64_t x) | |
54 | { | |
55 | uint64_t result; | |
56 | if (__builtin_constant_p(x)) | |
57 | result = default_bswap64(x); | |
58 | else | |
59 | __asm__("bswap %q0" : "=r" (result) : "0" (x)); | |
60 | return result; | |
61 | } | |
62 | #else | |
63 | static inline uint64_t git_bswap64(uint64_t x) | |
64 | { | |
65 | union { uint64_t i64; uint32_t i32[2]; } tmp, result; | |
66 | if (__builtin_constant_p(x)) | |
67 | result.i64 = default_bswap64(x); | |
68 | else { | |
69 | tmp.i64 = x; | |
70 | result.i32[0] = git_bswap32(tmp.i32[1]); | |
71 | result.i32[1] = git_bswap32(tmp.i32[0]); | |
72 | } | |
73 | return result.i64; | |
74 | } | |
75 | #endif | |
76 | ||
0fcabdeb SS |
77 | #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) |
78 | ||
79 | #include <stdlib.h> | |
80 | ||
81 | #define bswap32(x) _byteswap_ulong(x) | |
7e3dae49 | 82 | #define bswap64(x) _byteswap_uint64(x) |
0fcabdeb SS |
83 | |
84 | #endif | |
85 | ||
7e3dae49 | 86 | #if defined(bswap32) |
0fcabdeb | 87 | |
51ea5519 NP |
88 | #undef ntohl |
89 | #undef htonl | |
90 | #define ntohl(x) bswap32(x) | |
91 | #define htonl(x) bswap32(x) | |
92 | ||
93 | #endif | |
7e3dae49 VM |
94 | |
95 | #if defined(bswap64) | |
96 | ||
97 | #undef ntohll | |
98 | #undef htonll | |
99 | #define ntohll(x) bswap64(x) | |
100 | #define htonll(x) bswap64(x) | |
101 | ||
102 | #else | |
103 | ||
104 | #undef ntohll | |
105 | #undef htonll | |
106 | ||
839fa9c5 | 107 | #if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN) |
3cf6bb34 CB |
108 | |
109 | # define GIT_BYTE_ORDER __BYTE_ORDER | |
110 | # define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN | |
111 | # define GIT_BIG_ENDIAN __BIG_ENDIAN | |
112 | ||
839fa9c5 JH |
113 | #elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) |
114 | ||
115 | # define GIT_BYTE_ORDER BYTE_ORDER | |
116 | # define GIT_LITTLE_ENDIAN LITTLE_ENDIAN | |
117 | # define GIT_BIG_ENDIAN BIG_ENDIAN | |
118 | ||
3cf6bb34 CB |
119 | #else |
120 | ||
121 | # define GIT_BIG_ENDIAN 4321 | |
122 | # define GIT_LITTLE_ENDIAN 1234 | |
123 | ||
124 | # if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) | |
125 | # define GIT_BYTE_ORDER GIT_BIG_ENDIAN | |
9c65ee15 | 126 | # elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) |
3cf6bb34 | 127 | # define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN |
bfb0e6fc DM |
128 | # elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__) |
129 | # define GIT_BYTE_ORDER GIT_BIG_ENDIAN | |
130 | # elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__) | |
131 | # define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN | |
3cf6bb34 CB |
132 | # else |
133 | # error "Cannot determine endianness" | |
7e3dae49 | 134 | # endif |
7e3dae49 | 135 | |
7e3dae49 VM |
136 | #endif |
137 | ||
3cf6bb34 | 138 | #if GIT_BYTE_ORDER == GIT_BIG_ENDIAN |
7e3dae49 VM |
139 | # define ntohll(n) (n) |
140 | # define htonll(n) (n) | |
141 | #else | |
142 | # define ntohll(n) default_bswap64(n) | |
143 | # define htonll(n) default_bswap64(n) | |
144 | #endif | |
145 | ||
146 | #endif | |
802b1233 | 147 | |
5b114f3b RS |
148 | static inline uint16_t get_be16(const void *ptr) |
149 | { | |
150 | const unsigned char *p = ptr; | |
151 | return (uint16_t)p[0] << 8 | | |
152 | (uint16_t)p[1] << 0; | |
153 | } | |
154 | ||
155 | static inline uint32_t get_be32(const void *ptr) | |
156 | { | |
157 | const unsigned char *p = ptr; | |
158 | return (uint32_t)p[0] << 24 | | |
159 | (uint32_t)p[1] << 16 | | |
160 | (uint32_t)p[2] << 8 | | |
161 | (uint32_t)p[3] << 0; | |
162 | } | |
163 | ||
b2e39d00 BP |
164 | static inline uint64_t get_be64(const void *ptr) |
165 | { | |
166 | const unsigned char *p = ptr; | |
167 | return (uint64_t)get_be32(&p[0]) << 32 | | |
168 | (uint64_t)get_be32(&p[4]) << 0; | |
169 | } | |
170 | ||
5b114f3b RS |
171 | static inline void put_be32(void *ptr, uint32_t value) |
172 | { | |
173 | unsigned char *p = ptr; | |
174 | p[0] = value >> 24; | |
175 | p[1] = value >> 16; | |
176 | p[2] = value >> 8; | |
177 | p[3] = value >> 0; | |
178 | } | |
802b1233 | 179 | |
b2e39d00 BP |
180 | static inline void put_be64(void *ptr, uint64_t value) |
181 | { | |
182 | unsigned char *p = ptr; | |
183 | p[0] = value >> 56; | |
184 | p[1] = value >> 48; | |
185 | p[2] = value >> 40; | |
186 | p[3] = value >> 32; | |
187 | p[4] = value >> 24; | |
188 | p[5] = value >> 16; | |
189 | p[6] = value >> 8; | |
190 | p[7] = value >> 0; | |
191 | } | |
192 | ||
33aa579a | 193 | #endif /* COMPAT_BSWAP_H */ |