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Commit | Line | Data |
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51ea5519 NP |
1 | /* |
2 | * Let's make sure we always have a sane definition for ntohl()/htonl(). | |
3 | * Some libraries define those as a function call, just to perform byte | |
4 | * shifting, bringing significant overhead to what should be a simple | |
5 | * operation. | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Default version that the compiler ought to optimize properly with | |
10 | * constant values. | |
11 | */ | |
5322ef20 | 12 | static inline uint32_t default_swab32(uint32_t val) |
51ea5519 NP |
13 | { |
14 | return (((val & 0xff000000) >> 24) | | |
15 | ((val & 0x00ff0000) >> 8) | | |
16 | ((val & 0x0000ff00) << 8) | | |
17 | ((val & 0x000000ff) << 24)); | |
18 | } | |
19 | ||
7e3dae49 VM |
20 | static inline uint64_t default_bswap64(uint64_t val) |
21 | { | |
22 | return (((val & (uint64_t)0x00000000000000ffULL) << 56) | | |
23 | ((val & (uint64_t)0x000000000000ff00ULL) << 40) | | |
24 | ((val & (uint64_t)0x0000000000ff0000ULL) << 24) | | |
25 | ((val & (uint64_t)0x00000000ff000000ULL) << 8) | | |
26 | ((val & (uint64_t)0x000000ff00000000ULL) >> 8) | | |
27 | ((val & (uint64_t)0x0000ff0000000000ULL) >> 24) | | |
28 | ((val & (uint64_t)0x00ff000000000000ULL) >> 40) | | |
29 | ((val & (uint64_t)0xff00000000000000ULL) >> 56)); | |
30 | } | |
31 | ||
21e403a7 | 32 | #undef bswap32 |
7e3dae49 | 33 | #undef bswap64 |
21e403a7 | 34 | |
51ea5519 NP |
35 | #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) |
36 | ||
c6c8d0b7 JN |
37 | #define bswap32 git_bswap32 |
38 | static inline uint32_t git_bswap32(uint32_t x) | |
39 | { | |
40 | uint32_t result; | |
41 | if (__builtin_constant_p(x)) | |
42 | result = default_swab32(x); | |
43 | else | |
44 | __asm__("bswap %0" : "=r" (result) : "0" (x)); | |
45 | return result; | |
46 | } | |
51ea5519 | 47 | |
7e3dae49 VM |
48 | #define bswap64 git_bswap64 |
49 | #if defined(__x86_64__) | |
50 | static inline uint64_t git_bswap64(uint64_t x) | |
51 | { | |
52 | uint64_t result; | |
53 | if (__builtin_constant_p(x)) | |
54 | result = default_bswap64(x); | |
55 | else | |
56 | __asm__("bswap %q0" : "=r" (result) : "0" (x)); | |
57 | return result; | |
58 | } | |
59 | #else | |
60 | static inline uint64_t git_bswap64(uint64_t x) | |
61 | { | |
62 | union { uint64_t i64; uint32_t i32[2]; } tmp, result; | |
63 | if (__builtin_constant_p(x)) | |
64 | result.i64 = default_bswap64(x); | |
65 | else { | |
66 | tmp.i64 = x; | |
67 | result.i32[0] = git_bswap32(tmp.i32[1]); | |
68 | result.i32[1] = git_bswap32(tmp.i32[0]); | |
69 | } | |
70 | return result.i64; | |
71 | } | |
72 | #endif | |
73 | ||
0fcabdeb SS |
74 | #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) |
75 | ||
76 | #include <stdlib.h> | |
77 | ||
78 | #define bswap32(x) _byteswap_ulong(x) | |
7e3dae49 | 79 | #define bswap64(x) _byteswap_uint64(x) |
0fcabdeb SS |
80 | |
81 | #endif | |
82 | ||
7e3dae49 | 83 | #if defined(bswap32) |
0fcabdeb | 84 | |
51ea5519 NP |
85 | #undef ntohl |
86 | #undef htonl | |
87 | #define ntohl(x) bswap32(x) | |
88 | #define htonl(x) bswap32(x) | |
89 | ||
90 | #endif | |
7e3dae49 VM |
91 | |
92 | #if defined(bswap64) | |
93 | ||
94 | #undef ntohll | |
95 | #undef htonll | |
96 | #define ntohll(x) bswap64(x) | |
97 | #define htonll(x) bswap64(x) | |
98 | ||
99 | #else | |
100 | ||
101 | #undef ntohll | |
102 | #undef htonll | |
103 | ||
839fa9c5 | 104 | #if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN) |
3cf6bb34 CB |
105 | |
106 | # define GIT_BYTE_ORDER __BYTE_ORDER | |
107 | # define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN | |
108 | # define GIT_BIG_ENDIAN __BIG_ENDIAN | |
109 | ||
839fa9c5 JH |
110 | #elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) |
111 | ||
112 | # define GIT_BYTE_ORDER BYTE_ORDER | |
113 | # define GIT_LITTLE_ENDIAN LITTLE_ENDIAN | |
114 | # define GIT_BIG_ENDIAN BIG_ENDIAN | |
115 | ||
3cf6bb34 CB |
116 | #else |
117 | ||
118 | # define GIT_BIG_ENDIAN 4321 | |
119 | # define GIT_LITTLE_ENDIAN 1234 | |
120 | ||
121 | # if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) | |
122 | # define GIT_BYTE_ORDER GIT_BIG_ENDIAN | |
9c65ee15 | 123 | # elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) |
3cf6bb34 | 124 | # define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN |
bfb0e6fc DM |
125 | # elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__) |
126 | # define GIT_BYTE_ORDER GIT_BIG_ENDIAN | |
127 | # elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__) | |
128 | # define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN | |
3cf6bb34 CB |
129 | # else |
130 | # error "Cannot determine endianness" | |
7e3dae49 | 131 | # endif |
7e3dae49 | 132 | |
7e3dae49 VM |
133 | #endif |
134 | ||
3cf6bb34 | 135 | #if GIT_BYTE_ORDER == GIT_BIG_ENDIAN |
7e3dae49 VM |
136 | # define ntohll(n) (n) |
137 | # define htonll(n) (n) | |
138 | #else | |
139 | # define ntohll(n) default_bswap64(n) | |
140 | # define htonll(n) default_bswap64(n) | |
141 | #endif | |
142 | ||
143 | #endif | |
802b1233 JK |
144 | |
145 | /* | |
146 | * Performance might be improved if the CPU architecture is OK with | |
147 | * unaligned 32-bit loads and a fast ntohl() is available. | |
148 | * Otherwise fall back to byte loads and shifts which is portable, | |
149 | * and is faster on architectures with memory alignment issues. | |
150 | */ | |
151 | ||
a0df2e5a JK |
152 | #if !defined(NO_UNALIGNED_LOADS) && ( \ |
153 | defined(__i386__) || defined(__x86_64__) || \ | |
802b1233 JK |
154 | defined(_M_IX86) || defined(_M_X64) || \ |
155 | defined(__ppc__) || defined(__ppc64__) || \ | |
156 | defined(__powerpc__) || defined(__powerpc64__) || \ | |
a0df2e5a | 157 | defined(__s390__) || defined(__s390x__)) |
802b1233 | 158 | |
c3d8da57 | 159 | #define get_be16(p) ntohs(*(unsigned short *)(p)) |
802b1233 | 160 | #define get_be32(p) ntohl(*(unsigned int *)(p)) |
b2e39d00 | 161 | #define get_be64(p) ntohll(*(uint64_t *)(p)) |
802b1233 | 162 | #define put_be32(p, v) do { *(unsigned int *)(p) = htonl(v); } while (0) |
b2e39d00 | 163 | #define put_be64(p, v) do { *(uint64_t *)(p) = htonll(v); } while (0) |
802b1233 JK |
164 | |
165 | #else | |
166 | ||
5b114f3b RS |
167 | static inline uint16_t get_be16(const void *ptr) |
168 | { | |
169 | const unsigned char *p = ptr; | |
170 | return (uint16_t)p[0] << 8 | | |
171 | (uint16_t)p[1] << 0; | |
172 | } | |
173 | ||
174 | static inline uint32_t get_be32(const void *ptr) | |
175 | { | |
176 | const unsigned char *p = ptr; | |
177 | return (uint32_t)p[0] << 24 | | |
178 | (uint32_t)p[1] << 16 | | |
179 | (uint32_t)p[2] << 8 | | |
180 | (uint32_t)p[3] << 0; | |
181 | } | |
182 | ||
b2e39d00 BP |
183 | static inline uint64_t get_be64(const void *ptr) |
184 | { | |
185 | const unsigned char *p = ptr; | |
186 | return (uint64_t)get_be32(&p[0]) << 32 | | |
187 | (uint64_t)get_be32(&p[4]) << 0; | |
188 | } | |
189 | ||
5b114f3b RS |
190 | static inline void put_be32(void *ptr, uint32_t value) |
191 | { | |
192 | unsigned char *p = ptr; | |
193 | p[0] = value >> 24; | |
194 | p[1] = value >> 16; | |
195 | p[2] = value >> 8; | |
196 | p[3] = value >> 0; | |
197 | } | |
802b1233 | 198 | |
b2e39d00 BP |
199 | static inline void put_be64(void *ptr, uint64_t value) |
200 | { | |
201 | unsigned char *p = ptr; | |
202 | p[0] = value >> 56; | |
203 | p[1] = value >> 48; | |
204 | p[2] = value >> 40; | |
205 | p[3] = value >> 32; | |
206 | p[4] = value >> 24; | |
207 | p[5] = value >> 16; | |
208 | p[6] = value >> 8; | |
209 | p[7] = value >> 0; | |
210 | } | |
211 | ||
802b1233 | 212 | #endif |