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Comparing libecb/ecb.h (file contents):
Revision 1.37 by root, Sat Jun 11 13:47:47 2011 UTC vs.
Revision 1.58 by root, Wed Aug 3 15:40:18 2011 UTC

28 */ 28 */
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33#ifdef _WIN32
34 typedef signed char int8_t;
35 typedef unsigned char uint8_t;
36 typedef signed short int16_t;
37 typedef unsigned short uint16_t;
38 typedef signed int int32_t;
39 typedef unsigned int uint32_t;
40 #if __GNUC__
41 typedef signed long long int64_t;
42 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t;
46 #endif
47#else
33#include <inttypes.h> 48 #include <inttypes.h>
49#endif
34 50
35/* many compilers define _GNUC_ to some versions but then only implement 51/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions, 52 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers. 53 * causing enourmous grief in return for some better fake benchmark numbers.
38 * or so. 54 * or so.
39 * we try to detect these and simply assume they are not gcc - if they have 55 * we try to detect these and simply assume they are not gcc - if they have
40 * an issue with that they should have done it right in the first place. 56 * an issue with that they should have done it right in the first place.
41 */ 57 */
42#ifndef ECB_GCC_VERSION 58#ifndef ECB_GCC_VERSION
43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
44 #define ECB_GCC_VERSION(major,minor) 0 60 #define ECB_GCC_VERSION(major,minor) 0
45 #else 61 #else
46 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
47 #endif 63 #endif
48#endif 64#endif
49 65
50#ifndef __cplusplus 66/*****************************************************************************/
51 #if __STDC_VERSION__ >= 199901L 67
52 #define ECB_INLINE static inline 68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
53 typedef _Bool ecb_bool; 69/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
54 #else 70
55 #define ECB_INLINE static inline /* we assume the extension is ubiquituous, please tell us when we are wrong, or upgrade to the GCC */ 71#if ECB_NO_THREADS || ECB_NO_SMP
56 typedef int ecb_bool; 72 #define ECB_MEMORY_FENCE do { } while (0)
73 #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0)
74 #define ECB_MEMORY_FENCE_RELEASE do { } while (0)
75#endif
76
77#ifndef ECB_MEMORY_FENCE
78 #if ECB_GCC_VERSION(2,5)
79 #if __x86
80 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
81 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
82 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
83 #elif __amd64
84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
85 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
86 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
87 #endif
57 #endif 88 #endif
58#else 89#endif
59 #define ECB_INLINE static inline 90
60 typedef bool ecb_bool; 91#ifndef ECB_MEMORY_FENCE
92 #if ECB_GCC_VERSION(4,4)
93 #define ECB_MEMORY_FENCE __sync_synchronize ()
94 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); })
95 #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); })
96 #elif _MSC_VER >= 1400 /* VC++ 2005 */
97 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
98 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
99 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
100 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
101 #elif defined(_WIN32)
102 #include <WinNT.h>
103 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
104 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
105 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
61#endif 106 #endif
107#endif
108
109#ifndef ECB_MEMORY_FENCE
110 /*
111 * if you get undefined symbol references to pthread_mutex_lock,
112 * or failure to find pthread.h, then you should implement
113 * the ECB_MEMORY_FENCE operations for your cpu/compiler
114 * OR proide pthread.h and link against the posix thread library
115 * of your system.
116 */
117 #include <pthread.h>
118
119 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
120 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
121 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
122 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
123#endif
124
125/*****************************************************************************/
126
127#define ECB_C99 (__STDC_VERSION__ >= 199901L)
128
129#if __cplusplus
130 #define ecb_inline static inline
131#elif ECB_GCC_VERSION(2,5)
132 #define ecb_inline static __inline__
133#elif ECB_C99
134 #define ecb_inline static inline
135#else
136 #define ecb_inline static
137#endif
138
139#if ECB_GCC_VERSION(3,3)
140 #define ecb_restrict __restrict__
141#elif ECB_C99
142 #define ecb_restrict restrict
143#else
144 #define ecb_restrict
145#endif
146
147typedef int ecb_bool;
62 148
63#define ECB_CONCAT_(a, b) a ## b 149#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 150#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a 151#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 152#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67 153
68#define ECB_HEADER_INLINE ECB_INLINE 154#define ecb_function_ ecb_inline
69 155
70#if ECB_GCC_VERSION(3,1) 156#if ECB_GCC_VERSION(3,1)
71 #define ecb_attribute(attrlist) __attribute__(attrlist) 157 #define ecb_attribute(attrlist) __attribute__(attrlist)
72 #define ecb_is_constant(expr) __builtin_constant_p (expr) 158 #define ecb_is_constant(expr) __builtin_constant_p (expr)
73 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 159 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
81 167
82/* no emulation for ecb_decltype */ 168/* no emulation for ecb_decltype */
83#if ECB_GCC_VERSION(4,5) 169#if ECB_GCC_VERSION(4,5)
84 #define ecb_decltype(x) __decltype(x) 170 #define ecb_decltype(x) __decltype(x)
85#elif ECB_GCC_VERSION(3,0) 171#elif ECB_GCC_VERSION(3,0)
86 #define ecb_decltype(x) typeof(x) 172 #define ecb_decltype(x) __typeof(x)
87#endif 173#endif
88 174
89#define ecb_noinline ecb_attribute ((__noinline__)) 175#define ecb_noinline ecb_attribute ((__noinline__))
90#define ecb_noreturn ecb_attribute ((__noreturn__)) 176#define ecb_noreturn ecb_attribute ((__noreturn__))
91#define ecb_unused ecb_attribute ((__unused__)) 177#define ecb_unused ecb_attribute ((__unused__))
92#define ecb_const ecb_attribute ((__const__)) 178#define ecb_const ecb_attribute ((__const__))
93#define ecb_pure ecb_attribute ((__pure__)) 179#define ecb_pure ecb_attribute ((__pure__))
94 180
95#if ECB_GCC_VERSION(4,3) 181#if ECB_GCC_VERSION(4,3)
96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ 182 #define ecb_artificial ecb_attribute ((__artificial__))
97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 183 #define ecb_hot ecb_attribute ((__hot__))
98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 184 #define ecb_cold ecb_attribute ((__cold__))
99#else 185#else
100 #define ecb_artificial 186 #define ecb_artificial
101 #define ecb_hot 187 #define ecb_hot
102 #define ecb_cold 188 #define ecb_cold
103#endif 189#endif
104 190
105/* put into if's if you are very sure that the expression */ 191/* put around conditional expressions if you are very sure that the */
106/* is mostly true or mostly false. note that these return */ 192/* expression is mostly true or mostly false. note that these return */
107/* booleans, not the expression. */ 193/* booleans, not the expression. */
108#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 194#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
109#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 195#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
110/* for compatibility to the rest of the world */ 196/* for compatibility to the rest of the world */
111#define ecb_likely(expr) ecb_expect_true (expr) 197#define ecb_likely(expr) ecb_expect_true (expr)
112#define ecb_unlikely(expr) ecb_expect_false (expr) 198#define ecb_unlikely(expr) ecb_expect_false (expr)
113 199
114/* try to tell the compiler that some condition is definitely true */
115#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
116
117/* count trailing zero bits and count # of one bits */ 200/* count trailing zero bits and count # of one bits */
118#if ECB_GCC_VERSION(3,4) 201#if ECB_GCC_VERSION(3,4)
202 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
203 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
204 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
119 #define ecb_ctz32(x) __builtin_ctz (x) 205 #define ecb_ctz32(x) __builtin_ctz (x)
206 #define ecb_ctz64(x) __builtin_ctzll (x)
120 #define ecb_popcount32(x) __builtin_popcount (x) 207 #define ecb_popcount32(x) __builtin_popcount (x)
208 /* no popcountll */
121#else 209#else
122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 210 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
123 ECB_HEADER_INLINE int 211 ecb_function_ int
124 ecb_ctz32 (uint32_t x) 212 ecb_ctz32 (uint32_t x)
125 { 213 {
126 int r = 0; 214 int r = 0;
127 215
128 x &= -x; /* this isolates the lowest bit */ 216 x &= ~x + 1; /* this isolates the lowest bit */
129 217
218#if ECB_branchless_on_i386
219 r += !!(x & 0xaaaaaaaa) << 0;
220 r += !!(x & 0xcccccccc) << 1;
221 r += !!(x & 0xf0f0f0f0) << 2;
222 r += !!(x & 0xff00ff00) << 3;
223 r += !!(x & 0xffff0000) << 4;
224#else
130 if (x & 0xaaaaaaaa) r += 1; 225 if (x & 0xaaaaaaaa) r += 1;
131 if (x & 0xcccccccc) r += 2; 226 if (x & 0xcccccccc) r += 2;
132 if (x & 0xf0f0f0f0) r += 4; 227 if (x & 0xf0f0f0f0) r += 4;
133 if (x & 0xff00ff00) r += 8; 228 if (x & 0xff00ff00) r += 8;
134 if (x & 0xffff0000) r += 16; 229 if (x & 0xffff0000) r += 16;
230#endif
135 231
136 return r; 232 return r;
137 } 233 }
138 234
235 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
236 ecb_function_ int
237 ecb_ctz64 (uint64_t x)
238 {
239 int shift = x & 0xffffffffU ? 0 : 32;
240 return ecb_ctz32 (x >> shift) + shift;
241 }
242
139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 243 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
140 ECB_HEADER_INLINE int 244 ecb_function_ int
141 ecb_popcount32 (uint32_t x) 245 ecb_popcount32 (uint32_t x)
142 { 246 {
143 x -= (x >> 1) & 0x55555555; 247 x -= (x >> 1) & 0x55555555;
144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 248 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
145 x = ((x >> 4) + x) & 0x0f0f0f0f; 249 x = ((x >> 4) + x) & 0x0f0f0f0f;
146 x *= 0x01010101; 250 x *= 0x01010101;
147 251
148 return x >> 24; 252 return x >> 24;
149 } 253 }
254
255 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
256 ecb_function_ int ecb_ld32 (uint32_t x)
257 {
258 int r = 0;
259
260 if (x >> 16) { x >>= 16; r += 16; }
261 if (x >> 8) { x >>= 8; r += 8; }
262 if (x >> 4) { x >>= 4; r += 4; }
263 if (x >> 2) { x >>= 2; r += 2; }
264 if (x >> 1) { r += 1; }
265
266 return r;
267 }
268
269 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
270 ecb_function_ int ecb_ld64 (uint64_t x)
271 {
272 int r = 0;
273
274 if (x >> 32) { x >>= 32; r += 32; }
275
276 return r + ecb_ld32 (x);
277 }
150#endif 278#endif
279
280/* popcount64 is only available on 64 bit cpus as gcc builtin */
281/* so for this version we are lazy */
282ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
283ecb_function_ int
284ecb_popcount64 (uint64_t x)
285{
286 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
287}
288
289ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
290ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
291ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
292ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
293ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
294ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
295ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
296ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
297
298ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
299ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
300ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
301ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
302ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
303ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
304ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
305ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
151 306
152#if ECB_GCC_VERSION(4,3) 307#if ECB_GCC_VERSION(4,3)
153 #define ecb_bswap32(x) __builtin_bswap32 (x)
154 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) 308 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
309 #define ecb_bswap32(x) __builtin_bswap32 (x)
310 #define ecb_bswap64(x) __builtin_bswap64 (x)
155#else 311#else
312 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
313 ecb_function_ uint16_t
314 ecb_bswap16 (uint16_t x)
315 {
316 return ecb_rotl16 (x, 8);
317 }
318
156 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 319 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
157 ECB_HEADER_INLINE uint32_t 320 ecb_function_ uint32_t
158 ecb_bswap32 (uint32_t x) 321 ecb_bswap32 (uint32_t x)
159 { 322 {
160 return (x >> 24) 323 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
161 | ((x >> 8) & 0x0000ff00)
162 | ((x << 8) & 0x00ff0000)
163 | (x << 24);
164 } 324 }
165 325
166 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; 326 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
167 ECB_HEADER_INLINE uint32_t 327 ecb_function_ uint64_t
168 ecb_bswap16 (uint32_t x) 328 ecb_bswap64 (uint64_t x)
169 { 329 {
170 return ((x >> 8) & 0xff) 330 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
171 | ((x << 8) & 0x00ff0000)
172 | (x << 24);
173 } 331 }
174#endif 332#endif
175 333
176#if ECB_GCC_VERSION(4,5) 334#if ECB_GCC_VERSION(4,5)
177 #define ecb_unreachable() __builtin_unreachable () 335 #define ecb_unreachable() __builtin_unreachable ()
178#else 336#else
179 /* this seems to work fine, but gcc always emits a warning for it :/ */ 337 /* this seems to work fine, but gcc always emits a warning for it :/ */
180 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; 338 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
181 ECB_HEADER_INLINE void ecb_unreachable (void) { } 339 ecb_function_ void ecb_unreachable (void) { }
182#endif 340#endif
183 341
342/* try to tell the compiler that some condition is definitely true */
343#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
344
184ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; 345ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
185ECB_HEADER_INLINE unsigned char 346ecb_function_ unsigned char
186ecb_byteorder_helper (void) 347ecb_byteorder_helper (void)
187{ 348{
188 const uint32_t u = 0x11223344; 349 const uint32_t u = 0x11223344;
189 return *(unsigned char *)&u; 350 return *(unsigned char *)&u;
190} 351}
191 352
192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 353ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
193ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 354ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 355ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
195ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 356ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
196 357
197#if ECB_GCC_VERSION(3,0) 358#if ECB_GCC_VERSION(3,0) || ECB_C99
198 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 359 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
199#else 360#else
200 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 361 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
201#endif 362#endif
202 363
203#if ecb_cplusplus_does_not_suck 364#if ecb_cplusplus_does_not_suck
204 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 365 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
205 template<typename T, int N> 366 template<typename T, int N>
206 static inline int ecb_array_length (const T (&arr)[N]) 367 static inline int ecb_array_length (const T (&arr)[N])
207 { 368 {
208 return N; 369 return N;
209 } 370 }
210#else 371#else
211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 372 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
212#endif 373#endif
213 374
214ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
215ECB_INLINE uint32_t
216ecb_rotr32 (uint32_t x, unsigned int count)
217{
218 return (x << (32 - count)) | (x >> count);
219}
220
221ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
222ECB_INLINE uint32_t
223ecb_rotl32 (uint32_t x, unsigned int count)
224{
225 return (x >> (32 - count)) | (x << count);
226}
227
228#endif 375#endif
229 376

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