1 /* CC0 (Public domain) - see LICENSE file for details */
8 * BSWAP_16 - reverse bytes in a constant uint16_t value.
9 * @val: constant value whose bytes to swap.
11 * Designed to be usable in constant-requiring initializers.
15 * char buf[BSWAP_16(0x1234)];
18 #define BSWAP_16(val) \
19 ((((uint16_t)val & 0x00ff) << 8) \
20 | (((uint16_t)val & 0xff00) >> 8))
23 * BSWAP_32 - reverse bytes in a constant uint32_t value.
24 * @val: constant value whose bytes to swap.
26 * Designed to be usable in constant-requiring initializers.
30 * char buf[BSWAP_32(0xff000000)];
33 #define BSWAP_32(val) \
34 ((((uint32_t)val & 0x000000ff) << 24) \
35 | (((uint32_t)val & 0x0000ff00) << 8) \
36 | (((uint32_t)val & 0x00ff0000) >> 8) \
37 | (((uint32_t)val & 0xff000000) >> 24))
40 * BSWAP_64 - reverse bytes in a constant uint64_t value.
41 * @val: constantvalue whose bytes to swap.
43 * Designed to be usable in constant-requiring initializers.
47 * char buf[BSWAP_64(0xff00000000000000ULL)];
50 #define BSWAP_64(val) \
51 ((((uint64_t)val & 0x00000000000000ffULL) << 56) \
52 | (((uint64_t)val & 0x000000000000ff00ULL) << 40) \
53 | (((uint64_t)val & 0x0000000000ff0000ULL) << 24) \
54 | (((uint64_t)val & 0x00000000ff000000ULL) << 8) \
55 | (((uint64_t)val & 0x000000ff00000000ULL) >> 8) \
56 | (((uint64_t)val & 0x0000ff0000000000ULL) >> 24) \
57 | (((uint64_t)val & 0x00ff000000000000ULL) >> 40) \
58 | (((uint64_t)val & 0xff00000000000000ULL) >> 56))
64 * bswap_16 - reverse bytes in a uint16_t value.
65 * @val: value whose bytes to swap.
68 * // Output contains "1024 is 4 as two bytes reversed"
69 * printf("1024 is %u as two bytes reversed\n", bswap_16(1024));
71 static inline uint16_t bswap_16(uint16_t val)
77 * bswap_32 - reverse bytes in a uint32_t value.
78 * @val: value whose bytes to swap.
81 * // Output contains "1024 is 262144 as four bytes reversed"
82 * printf("1024 is %u as four bytes reversed\n", bswap_32(1024));
84 static inline uint32_t bswap_32(uint32_t val)
88 #endif /* !HAVE_BYTESWAP_H */
92 * bswap_64 - reverse bytes in a uint64_t value.
93 * @val: value whose bytes to swap.
96 * // Output contains "1024 is 1125899906842624 as eight bytes reversed"
97 * printf("1024 is %llu as eight bytes reversed\n",
98 * (unsigned long long)bswap_64(1024));
100 static inline uint64_t bswap_64(uint64_t val)
102 return BSWAP_64(val);
106 /* Sanity check the defines. We don't handle weird endianness. */
107 #if !HAVE_LITTLE_ENDIAN && !HAVE_BIG_ENDIAN
108 #error "Unknown endian"
109 #elif HAVE_LITTLE_ENDIAN && HAVE_BIG_ENDIAN
110 #error "Can't compile for both big and little endian."
114 /* sparse needs forcing to remove bitwise attribute from ccan/short_types */
115 #define ENDIAN_CAST __attribute__((force))
116 #define ENDIAN_TYPE __attribute__((bitwise))
122 typedef uint64_t ENDIAN_TYPE leint64_t;
123 typedef uint64_t ENDIAN_TYPE beint64_t;
124 typedef uint32_t ENDIAN_TYPE leint32_t;
125 typedef uint32_t ENDIAN_TYPE beint32_t;
126 typedef uint16_t ENDIAN_TYPE leint16_t;
127 typedef uint16_t ENDIAN_TYPE beint16_t;
129 #if HAVE_LITTLE_ENDIAN
131 * CPU_TO_LE64 - convert a constant uint64_t value to little-endian
132 * @native: constant to convert
134 #define CPU_TO_LE64(native) ((ENDIAN_CAST leint64_t)(native))
137 * CPU_TO_LE32 - convert a constant uint32_t value to little-endian
138 * @native: constant to convert
140 #define CPU_TO_LE32(native) ((ENDIAN_CAST leint32_t)(native))
143 * CPU_TO_LE16 - convert a constant uint16_t value to little-endian
144 * @native: constant to convert
146 #define CPU_TO_LE16(native) ((ENDIAN_CAST leint16_t)(native))
149 * LE64_TO_CPU - convert a little-endian uint64_t constant
150 * @le_val: little-endian constant to convert
152 #define LE64_TO_CPU(le_val) ((ENDIAN_CAST uint64_t)(le_val))
155 * LE32_TO_CPU - convert a little-endian uint32_t constant
156 * @le_val: little-endian constant to convert
158 #define LE32_TO_CPU(le_val) ((ENDIAN_CAST uint32_t)(le_val))
161 * LE16_TO_CPU - convert a little-endian uint16_t constant
162 * @le_val: little-endian constant to convert
164 #define LE16_TO_CPU(le_val) ((ENDIAN_CAST uint16_t)(le_val))
166 #else /* ... HAVE_BIG_ENDIAN */
167 #define CPU_TO_LE64(native) ((ENDIAN_CAST leint64_t)BSWAP_64(native))
168 #define CPU_TO_LE32(native) ((ENDIAN_CAST leint32_t)BSWAP_32(native))
169 #define CPU_TO_LE16(native) ((ENDIAN_CAST leint16_t)BSWAP_16(native))
170 #define LE64_TO_CPU(le_val) BSWAP_64((ENDIAN_CAST uint64_t)le_val)
171 #define LE32_TO_CPU(le_val) BSWAP_32((ENDIAN_CAST uint32_t)le_val)
172 #define LE16_TO_CPU(le_val) BSWAP_16((ENDIAN_CAST uint16_t)le_val)
173 #endif /* HAVE_BIG_ENDIAN */
177 * CPU_TO_BE64 - convert a constant uint64_t value to big-endian
178 * @native: constant to convert
180 #define CPU_TO_BE64(native) ((ENDIAN_CAST beint64_t)(native))
183 * CPU_TO_BE32 - convert a constant uint32_t value to big-endian
184 * @native: constant to convert
186 #define CPU_TO_BE32(native) ((ENDIAN_CAST beint32_t)(native))
189 * CPU_TO_BE16 - convert a constant uint16_t value to big-endian
190 * @native: constant to convert
192 #define CPU_TO_BE16(native) ((ENDIAN_CAST beint16_t)(native))
195 * BE64_TO_CPU - convert a big-endian uint64_t constant
196 * @le_val: big-endian constant to convert
198 #define BE64_TO_CPU(le_val) ((ENDIAN_CAST uint64_t)(le_val))
201 * BE32_TO_CPU - convert a big-endian uint32_t constant
202 * @le_val: big-endian constant to convert
204 #define BE32_TO_CPU(le_val) ((ENDIAN_CAST uint32_t)(le_val))
207 * BE16_TO_CPU - convert a big-endian uint16_t constant
208 * @le_val: big-endian constant to convert
210 #define BE16_TO_CPU(le_val) ((ENDIAN_CAST uint16_t)(le_val))
212 #else /* ... HAVE_LITTLE_ENDIAN */
213 #define CPU_TO_BE64(native) ((ENDIAN_CAST beint64_t)BSWAP_64(native))
214 #define CPU_TO_BE32(native) ((ENDIAN_CAST beint32_t)BSWAP_32(native))
215 #define CPU_TO_BE16(native) ((ENDIAN_CAST beint16_t)BSWAP_16(native))
216 #define BE64_TO_CPU(le_val) BSWAP_64((ENDIAN_CAST uint64_t)le_val)
217 #define BE32_TO_CPU(le_val) BSWAP_32((ENDIAN_CAST uint32_t)le_val)
218 #define BE16_TO_CPU(le_val) BSWAP_16((ENDIAN_CAST uint16_t)le_val)
219 #endif /* HAVE_LITTE_ENDIAN */
223 * cpu_to_le64 - convert a uint64_t value to little-endian
224 * @native: value to convert
226 static inline leint64_t cpu_to_le64(uint64_t native)
228 return CPU_TO_LE64(native);
232 * cpu_to_le32 - convert a uint32_t value to little-endian
233 * @native: value to convert
235 static inline leint32_t cpu_to_le32(uint32_t native)
237 return CPU_TO_LE32(native);
241 * cpu_to_le16 - convert a uint16_t value to little-endian
242 * @native: value to convert
244 static inline leint16_t cpu_to_le16(uint16_t native)
246 return CPU_TO_LE16(native);
250 * le64_to_cpu - convert a little-endian uint64_t value
251 * @le_val: little-endian value to convert
253 static inline uint64_t le64_to_cpu(leint64_t le_val)
255 return LE64_TO_CPU(le_val);
259 * le32_to_cpu - convert a little-endian uint32_t value
260 * @le_val: little-endian value to convert
262 static inline uint32_t le32_to_cpu(leint32_t le_val)
264 return LE32_TO_CPU(le_val);
268 * le16_to_cpu - convert a little-endian uint16_t value
269 * @le_val: little-endian value to convert
271 static inline uint16_t le16_to_cpu(leint16_t le_val)
273 return LE16_TO_CPU(le_val);
277 * cpu_to_be64 - convert a uint64_t value to big endian.
278 * @native: value to convert
280 static inline beint64_t cpu_to_be64(uint64_t native)
282 return ((ENDIAN_CAST beint64_t)BSWAP_64(native));
283 return CPU_TO_BE64(native);
287 * cpu_to_be32 - convert a uint32_t value to big endian.
288 * @native: value to convert
290 static inline beint32_t cpu_to_be32(uint32_t native)
292 return CPU_TO_BE32(native);
296 * cpu_to_be16 - convert a uint16_t value to big endian.
297 * @native: value to convert
299 static inline beint16_t cpu_to_be16(uint16_t native)
301 return CPU_TO_BE16(native);
305 * be64_to_cpu - convert a big-endian uint64_t value
306 * @be_val: big-endian value to convert
308 static inline uint64_t be64_to_cpu(beint64_t be_val)
310 return BE64_TO_CPU(be_val);
314 * be32_to_cpu - convert a big-endian uint32_t value
315 * @be_val: big-endian value to convert
317 static inline uint32_t be32_to_cpu(beint32_t be_val)
319 return BE32_TO_CPU(be_val);
323 * be16_to_cpu - convert a big-endian uint16_t value
324 * @be_val: big-endian value to convert
326 static inline uint16_t be16_to_cpu(beint16_t be_val)
328 return BE16_TO_CPU(be_val);
331 /* Whichever they include first, they get these definitions. */
332 #ifdef CCAN_SHORT_TYPES_H
334 * be64/be32/be16 - 64/32/16 bit big-endian representation.
336 typedef beint64_t be64;
337 typedef beint32_t be32;
338 typedef beint16_t be16;
341 * le64/le32/le16 - 64/32/16 bit little-endian representation.
343 typedef leint64_t le64;
344 typedef leint32_t le32;
345 typedef leint16_t le16;
347 #endif /* CCAN_ENDIAN_H */