-
Notifications
You must be signed in to change notification settings - Fork 11
/
Copy pathxxhash.h
2076 lines (1790 loc) · 73 KB
/
xxhash.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* xxHash - Extremely Fast Hash algorithm
* Header File
* Copyright (C) 2012-2020 Yann Collet
*
* BSD 2-Clause License (https://www.opensource.org/licenses/bsd-license.php)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You can contact the author at:
* - xxHash homepage: https://www.xxhash.com
* - xxHash source repository: https://github.com/Cyan4973/xxHash
*/
/* TODO: update */
/* Notice extracted from xxHash homepage:
xxHash is an extremely fast hash algorithm, running at RAM speed limits.
It also successfully passes all tests from the SMHasher suite.
Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2 Duo @3GHz)
Name Speed Q.Score Author
xxHash 5.4 GB/s 10
CrapWow 3.2 GB/s 2 Andrew
MumurHash 3a 2.7 GB/s 10 Austin Appleby
SpookyHash 2.0 GB/s 10 Bob Jenkins
SBox 1.4 GB/s 9 Bret Mulvey
Lookup3 1.2 GB/s 9 Bob Jenkins
SuperFastHash 1.2 GB/s 1 Paul Hsieh
CityHash64 1.05 GB/s 10 Pike & Alakuijala
FNV 0.55 GB/s 5 Fowler, Noll, Vo
CRC32 0.43 GB/s 9
MD5-32 0.33 GB/s 10 Ronald L. Rivest
SHA1-32 0.28 GB/s 10
Q.Score is a measure of quality of the hash function.
It depends on successfully passing SMHasher test set.
10 is a perfect score.
Note: SMHasher's CRC32 implementation is not the fastest one.
Other speed-oriented implementations can be faster,
especially in combination with PCLMUL instruction:
https://fastcompression.blogspot.com/2019/03/presenting-xxh3.html?showComment=1552696407071#c3490092340461170735
A 64-bit version, named XXH64, is available since r35.
It offers much better speed, but for 64-bit applications only.
Name Speed on 64 bits Speed on 32 bits
XXH64 13.8 GB/s 1.9 GB/s
XXH32 6.8 GB/s 6.0 GB/s
*/
#if defined (__cplusplus)
extern "C" {
#endif
/* ****************************
* INLINE mode
******************************/
/*!
* XXH_INLINE_ALL (and XXH_PRIVATE_API)
* Use these build macros to inline xxhash into the target unit.
* Inlining improves performance on small inputs, especially when the length is
* expressed as a compile-time constant:
*
* https://fastcompression.blogspot.com/2018/03/xxhash-for-small-keys-impressive-power.html
*
* It also keeps xxHash symbols private to the unit, so they are not exported.
*
* Usage:
* #define XXH_INLINE_ALL
* #include "xxhash.h"
*
* Do not compile and link xxhash.o as a separate object, as it is not useful.
*/
#if (defined(XXH_INLINE_ALL) || defined(XXH_PRIVATE_API)) \
&& !defined(XXH_INLINE_ALL_31684351384)
/* this section should be traversed only once */
# define XXH_INLINE_ALL_31684351384
/* give access to the advanced API, required to compile implementations */
# undef XXH_STATIC_LINKING_ONLY /* avoid macro redef */
# define XXH_STATIC_LINKING_ONLY
/* make all functions private */
# undef XXH_PUBLIC_API
# if defined(__GNUC__)
# define XXH_PUBLIC_API static __inline __attribute__((unused))
# elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
# define XXH_PUBLIC_API static inline
# elif defined(_MSC_VER)
# define XXH_PUBLIC_API static __inline
# else
/* note: this version may generate warnings for unused static functions */
# define XXH_PUBLIC_API static
# endif
/*
* This part deals with the special case where a unit wants to inline xxHash,
* but "xxhash.h" has previously been included without XXH_INLINE_ALL, such
* as part of some previously included *.h header file.
* Without further action, the new include would just be ignored,
* and functions would effectively _not_ be inlined (silent failure).
* The following macros solve this situation by prefixing all inlined names,
* avoiding naming collision with previous inclusions.
*/
# ifdef XXH_NAMESPACE
# error "XXH_INLINE_ALL with XXH_NAMESPACE is not supported"
/*
* Note: Alternative: #undef all symbols (it's a pretty large list).
* Without #error: it compiles, but functions are actually not inlined.
*/
# endif
# define XXH_NAMESPACE XXH_INLINE_
/*
* Some identifiers (enums, type names) are not symbols, but they must
* still be renamed to avoid redeclaration.
* Alternative solution: do not redeclare them.
* However, this requires some #ifdefs, and is a more dispersed action.
* Meanwhile, renaming can be achieved in a single block
*/
# define XXH_IPREF(Id) XXH_INLINE_ ## Id
# define XXH_OK XXH_IPREF(XXH_OK)
# define XXH_ERROR XXH_IPREF(XXH_ERROR)
# define XXH_errorcode XXH_IPREF(XXH_errorcode)
# define XXH32_canonical_t XXH_IPREF(XXH32_canonical_t)
# define XXH64_canonical_t XXH_IPREF(XXH64_canonical_t)
# define XXH128_canonical_t XXH_IPREF(XXH128_canonical_t)
# define XXH32_state_s XXH_IPREF(XXH32_state_s)
# define XXH32_state_t XXH_IPREF(XXH32_state_t)
# define XXH64_state_s XXH_IPREF(XXH64_state_s)
# define XXH64_state_t XXH_IPREF(XXH64_state_t)
# define XXH3_state_s XXH_IPREF(XXH3_state_s)
# define XXH3_state_t XXH_IPREF(XXH3_state_t)
# define XXH128_hash_t XXH_IPREF(XXH128_hash_t)
/* Ensure the header is parsed again, even if it was previously included */
# undef XXHASH_H_5627135585666179
# undef XXHASH_H_STATIC_13879238742
#endif /* XXH_INLINE_ALL || XXH_PRIVATE_API */
/* ****************************************************************
* Stable API
*****************************************************************/
#ifndef XXHASH_H_5627135585666179
#define XXHASH_H_5627135585666179 1
/* specific declaration modes for Windows */
#if !defined(XXH_INLINE_ALL) && !defined(XXH_PRIVATE_API)
# if defined(WIN32) && defined(_MSC_VER) && (defined(XXH_IMPORT) || defined(XXH_EXPORT))
# ifdef XXH_EXPORT
# define XXH_PUBLIC_API __declspec(dllexport)
# elif XXH_IMPORT
# define XXH_PUBLIC_API __declspec(dllimport)
# endif
# else
# define XXH_PUBLIC_API /* do nothing */
# endif
#endif
/*!
* XXH_NAMESPACE, aka Namespace Emulation:
*
* If you want to include _and expose_ xxHash functions from within your own
* library, but also want to avoid symbol collisions with other libraries which
* may also include xxHash, you can use XXH_NAMESPACE to automatically prefix
* any public symbol from xxhash library with the value of XXH_NAMESPACE
* (therefore, avoid empty or numeric values).
*
* Note that no change is required within the calling program as long as it
* includes `xxhash.h`: Regular symbol names will be automatically translated
* by this header.
*/
#ifdef XXH_NAMESPACE
# define XXH_CAT(A,B) A##B
# define XXH_NAME2(A,B) XXH_CAT(A,B)
# define XXH_versionNumber XXH_NAME2(XXH_NAMESPACE, XXH_versionNumber)
# define XXH32 XXH_NAME2(XXH_NAMESPACE, XXH32)
# define XXH32_createState XXH_NAME2(XXH_NAMESPACE, XXH32_createState)
# define XXH32_freeState XXH_NAME2(XXH_NAMESPACE, XXH32_freeState)
# define XXH32_reset XXH_NAME2(XXH_NAMESPACE, XXH32_reset)
# define XXH32_update XXH_NAME2(XXH_NAMESPACE, XXH32_update)
# define XXH32_digest XXH_NAME2(XXH_NAMESPACE, XXH32_digest)
# define XXH32_copyState XXH_NAME2(XXH_NAMESPACE, XXH32_copyState)
# define XXH32_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH32_canonicalFromHash)
# define XXH32_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH32_hashFromCanonical)
# define XXH64 XXH_NAME2(XXH_NAMESPACE, XXH64)
# define XXH64_createState XXH_NAME2(XXH_NAMESPACE, XXH64_createState)
# define XXH64_freeState XXH_NAME2(XXH_NAMESPACE, XXH64_freeState)
# define XXH64_reset XXH_NAME2(XXH_NAMESPACE, XXH64_reset)
# define XXH64_update XXH_NAME2(XXH_NAMESPACE, XXH64_update)
# define XXH64_digest XXH_NAME2(XXH_NAMESPACE, XXH64_digest)
# define XXH64_copyState XXH_NAME2(XXH_NAMESPACE, XXH64_copyState)
# define XXH64_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH64_canonicalFromHash)
# define XXH64_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH64_hashFromCanonical)
#endif
/* *************************************
* Version
***************************************/
#define XXH_VERSION_MAJOR 0
#define XXH_VERSION_MINOR 7
#define XXH_VERSION_RELEASE 4
#define XXH_VERSION_NUMBER (XXH_VERSION_MAJOR *100*100 + XXH_VERSION_MINOR *100 + XXH_VERSION_RELEASE)
XXH_PUBLIC_API unsigned XXH_versionNumber (void);
/* ****************************
* Definitions
******************************/
#include <stddef.h> /* size_t */
typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode;
/*-**********************************************************************
* 32-bit hash
************************************************************************/
#if !defined (__VMS) \
&& (defined (__cplusplus) \
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
# include <stdint.h>
typedef uint32_t XXH32_hash_t;
#else
# include <limits.h>
# if UINT_MAX == 0xFFFFFFFFUL
typedef unsigned int XXH32_hash_t;
# else
# if ULONG_MAX == 0xFFFFFFFFUL
typedef unsigned long XXH32_hash_t;
# else
# error "unsupported platform: need a 32-bit type"
# endif
# endif
#endif
/*!
* XXH32():
* Calculate the 32-bit hash of sequence "length" bytes stored at memory address "input".
* The memory between input & input+length must be valid (allocated and read-accessible).
* "seed" can be used to alter the result predictably.
* Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark): 5.4 GB/s
*
* Note: XXH3 provides competitive speed for both 32-bit and 64-bit systems,
* and offers true 64/128 bit hash results. It provides a superior level of
* dispersion, and greatly reduces the risks of collisions.
*/
XXH_PUBLIC_API XXH32_hash_t XXH32 (const void* input, size_t length, XXH32_hash_t seed);
/******* Streaming *******/
/*
* Streaming functions generate the xxHash value from an incrememtal input.
* This method is slower than single-call functions, due to state management.
* For small inputs, prefer `XXH32()` and `XXH64()`, which are better optimized.
*
* An XXH state must first be allocated using `XXH*_createState()`.
*
* Start a new hash by initializing the state with a seed using `XXH*_reset()`.
*
* Then, feed the hash state by calling `XXH*_update()` as many times as necessary.
*
* The function returns an error code, with 0 meaning OK, and any other value
* meaning there is an error.
*
* Finally, a hash value can be produced anytime, by using `XXH*_digest()`.
* This function returns the nn-bits hash as an int or long long.
*
* It's still possible to continue inserting input into the hash state after a
* digest, and generate new hash values later on by invoking `XXH*_digest()`.
*
* When done, release the state using `XXH*_freeState()`.
*/
typedef struct XXH32_state_s XXH32_state_t; /* incomplete type */
XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void);
XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr);
XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* dst_state, const XXH32_state_t* src_state);
XXH_PUBLIC_API XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, XXH32_hash_t seed);
XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length);
XXH_PUBLIC_API XXH32_hash_t XXH32_digest (const XXH32_state_t* statePtr);
/******* Canonical representation *******/
/*
* The default return values from XXH functions are unsigned 32 and 64 bit
* integers.
* This the simplest and fastest format for further post-processing.
*
* However, this leaves open the question of what is the order on the byte level,
* since little and big endian conventions will store the same number differently.
*
* The canonical representation settles this issue by mandating big-endian
* convention, the same convention as human-readable numbers (large digits first).
*
* When writing hash values to storage, sending them over a network, or printing
* them, it's highly recommended to use the canonical representation to ensure
* portability across a wider range of systems, present and future.
*
* The following functions allow transformation of hash values to and from
* canonical format.
*/
typedef struct { unsigned char digest[4]; } XXH32_canonical_t;
XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash);
XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src);
#ifndef XXH_NO_LONG_LONG
/*-**********************************************************************
* 64-bit hash
************************************************************************/
#if !defined (__VMS) \
&& (defined (__cplusplus) \
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
# include <stdint.h>
typedef uint64_t XXH64_hash_t;
#else
/* the following type must have a width of 64-bit */
typedef unsigned long long XXH64_hash_t;
#endif
/*!
* XXH64():
* Returns the 64-bit hash of sequence of length @length stored at memory
* address @input.
* @seed can be used to alter the result predictably.
*
* This function usually runs faster on 64-bit systems, but slower on 32-bit
* systems (see benchmark).
*
* Note: XXH3 provides competitive speed for both 32-bit and 64-bit systems,
* and offers true 64/128 bit hash results. It provides a superior level of
* dispersion, and greatly reduces the risks of collisions.
*/
XXH_PUBLIC_API XXH64_hash_t XXH64 (const void* input, size_t length, XXH64_hash_t seed);
/******* Streaming *******/
typedef struct XXH64_state_s XXH64_state_t; /* incomplete type */
XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void);
XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* dst_state, const XXH64_state_t* src_state);
XXH_PUBLIC_API XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, XXH64_hash_t seed);
XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length);
XXH_PUBLIC_API XXH64_hash_t XXH64_digest (const XXH64_state_t* statePtr);
/******* Canonical representation *******/
typedef struct { unsigned char digest[sizeof(XXH64_hash_t)]; } XXH64_canonical_t;
XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash);
XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src);
#endif /* XXH_NO_LONG_LONG */
#endif /* XXHASH_H_5627135585666179 */
#if defined(XXH_STATIC_LINKING_ONLY) && !defined(XXHASH_H_STATIC_13879238742)
#define XXHASH_H_STATIC_13879238742
/* ****************************************************************************
* This section contains declarations which are not guaranteed to remain stable.
* They may change in future versions, becoming incompatible with a different
* version of the library.
* These declarations should only be used with static linking.
* Never use them in association with dynamic linking!
***************************************************************************** */
/*
* These definitions are only present to allow static allocation of an XXH
* state, for example, on the stack or in a struct.
* Never **ever** access members directly.
*/
struct XXH32_state_s {
XXH32_hash_t total_len_32;
XXH32_hash_t large_len;
XXH32_hash_t v1;
XXH32_hash_t v2;
XXH32_hash_t v3;
XXH32_hash_t v4;
XXH32_hash_t mem32[4];
XXH32_hash_t memsize;
XXH32_hash_t reserved; /* never read nor write, might be removed in a future version */
}; /* typedef'd to XXH32_state_t */
#ifndef XXH_NO_LONG_LONG /* defined when there is no 64-bit support */
struct XXH64_state_s {
XXH64_hash_t total_len;
XXH64_hash_t v1;
XXH64_hash_t v2;
XXH64_hash_t v3;
XXH64_hash_t v4;
XXH64_hash_t mem64[4];
XXH32_hash_t memsize;
XXH32_hash_t reserved32; /* required for padding anyway */
XXH64_hash_t reserved64; /* never read nor write, might be removed in a future version */
}; /* typedef'd to XXH64_state_t */
/*-**********************************************************************
* XXH3
* New experimental hash
************************************************************************/
/* ************************************************************************
* XXH3 is a new hash algorithm featuring:
* - Improved speed for both small and large inputs
* - True 64-bit and 128-bit outputs
* - SIMD acceleration
* - Improved 32-bit viability
*
* Speed analysis methodology is explained here:
*
* https://fastcompression.blogspot.com/2019/03/presenting-xxh3.html
*
* In general, expect XXH3 to run about ~2x faster on large inputs and >3x
* faster on small ones compared to XXH64, though exact differences depend on
* the platform.
*
* The algorithm is portable: Like XXH32 and XXH64, it generates the same hash
* on all platforms.
*
* It benefits greatly from SIMD and 64-bit arithmetic, but does not require it.
*
* Almost all 32-bit and 64-bit targets that can run XXH32 smoothly can run
* XXH3 at competitive speeds, even if XXH64 runs slowly. Further details are
* explained in the implementation.
*
* Optimized implementations are provided for AVX512, AVX2, SSE2, NEON, POWER8,
* ZVector and scalar targets. This can be controlled with the XXH_VECTOR macro.
*
* XXH3 offers 2 variants, _64bits and _128bits.
* When only 64 bits are needed, prefer calling the _64bits variant, as it
* reduces the amount of mixing, resulting in faster speed on small inputs.
*
* It's also generally simpler to manipulate a scalar return type than a struct.
*
* The 128-bit version adds additional strength, but it is slightly slower.
*
* The XXH3 algorithm is still in development.
* The results it produces may still change in future versions.
*
* Results produced by v0.7.x are not comparable with results from v0.7.y.
* However, the API is completely stable, and it can safely be used for
* ephemeral data (local sessions).
*
* Avoid storing values in long-term storage until the algorithm is finalized.
* XXH3's return values will be officially finalized upon reaching v0.8.0.
*
* After which, return values of XXH3 and XXH128 will no longer change in
* future versions.
*
* The API supports one-shot hashing, streaming mode, and custom secrets.
*/
#ifdef XXH_NAMESPACE
# define XXH3_64bits XXH_NAME2(XXH_NAMESPACE, XXH3_64bits)
# define XXH3_64bits_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_withSecret)
# define XXH3_64bits_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_withSeed)
# define XXH3_createState XXH_NAME2(XXH_NAMESPACE, XXH3_createState)
# define XXH3_freeState XXH_NAME2(XXH_NAMESPACE, XXH3_freeState)
# define XXH3_copyState XXH_NAME2(XXH_NAMESPACE, XXH3_copyState)
# define XXH3_64bits_reset XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset)
# define XXH3_64bits_reset_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset_withSeed)
# define XXH3_64bits_reset_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset_withSecret)
# define XXH3_64bits_update XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_update)
# define XXH3_64bits_digest XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_digest)
# define XXH3_generateSecret XXH_NAME2(XXH_NAMESPACE, XXH3_generateSecret)
#endif
/* XXH3_64bits():
* default 64-bit variant, using default secret and default seed of 0.
* It's the fastest variant. */
XXH_PUBLIC_API XXH64_hash_t XXH3_64bits(const void* data, size_t len);
/*
* XXH3_64bits_withSeed():
* This variant generates a custom secret on the fly based on the default
* secret, altered using the `seed` value.
* While this operation is decently fast, note that it's not completely free.
* Note: seed==0 produces the same results as XXH3_64bits().
*/
XXH_PUBLIC_API XXH64_hash_t XXH3_64bits_withSeed(const void* data, size_t len, XXH64_hash_t seed);
/*
* XXH3_64bits_withSecret():
* It's possible to provide any blob of bytes as a "secret" to generate the hash.
* This makes it more difficult for an external actor to prepare an intentional collision.
* The main condition is that secretSize *must* be large enough (>= XXH3_SECRET_SIZE_MIN).
* However, the quality of the hash highly depends on the secret's entropy.
* Technically, the secret must look like a bunch of random bytes.
* Avoid "trivial" or structured data such as repeated sequences or a text document.
* Whenever unsure about the "randonmess" of the blob of bytes,
* consider relabelling it as a "custom seed" instead,
* and employ "XXH3_generateSecret()" (see below)
* to generate a high quality secret derived from this custom seed.
*/
#define XXH3_SECRET_SIZE_MIN 136
XXH_PUBLIC_API XXH64_hash_t XXH3_64bits_withSecret(const void* data, size_t len, const void* secret, size_t secretSize);
/* streaming 64-bit */
#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11+ */
# include <stdalign.h>
# define XXH_ALIGN(n) alignas(n)
#elif defined(__GNUC__)
# define XXH_ALIGN(n) __attribute__ ((aligned(n)))
#elif defined(_MSC_VER)
# define XXH_ALIGN(n) __declspec(align(n))
#else
# define XXH_ALIGN(n) /* disabled */
#endif
/* Old GCC versions only accept the attribute after the type in structures. */
#if !(defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)) /* C11+ */ \
&& defined(__GNUC__)
# define XXH_ALIGN_MEMBER(align, type) type XXH_ALIGN(align)
#else
# define XXH_ALIGN_MEMBER(align, type) XXH_ALIGN(align) type
#endif
typedef struct XXH3_state_s XXH3_state_t;
#define XXH3_INTERNALBUFFER_SIZE 256
#define XXH3_SECRET_DEFAULT_SIZE 192
struct XXH3_state_s {
XXH_ALIGN_MEMBER(64, XXH64_hash_t acc[8]);
/* used to store a custom secret generated from a seed */
XXH_ALIGN_MEMBER(64, unsigned char customSecret[XXH3_SECRET_DEFAULT_SIZE]);
XXH_ALIGN_MEMBER(64, unsigned char buffer[XXH3_INTERNALBUFFER_SIZE]);
XXH32_hash_t bufferedSize;
XXH32_hash_t reserved32;
size_t nbStripesPerBlock;
size_t nbStripesSoFar;
size_t secretLimit;
XXH64_hash_t totalLen;
XXH64_hash_t seed;
XXH64_hash_t reserved64;
const unsigned char* extSecret; /* reference to external secret;
* if == NULL, use .customSecret instead */
/* note: there may be some padding at the end due to alignment on 64 bytes */
}; /* typedef'd to XXH3_state_t */
#undef XXH_ALIGN_MEMBER
/*
* Streaming requires state maintenance.
* This operation costs memory and CPU.
* As a consequence, streaming is slower than one-shot hashing.
* For better performance, prefer one-shot functions whenever possible.
*/
XXH_PUBLIC_API XXH3_state_t* XXH3_createState(void);
XXH_PUBLIC_API XXH_errorcode XXH3_freeState(XXH3_state_t* statePtr);
XXH_PUBLIC_API void XXH3_copyState(XXH3_state_t* dst_state, const XXH3_state_t* src_state);
/*
* XXH3_64bits_reset():
* Initialize with the default parameters.
* The result will be equivalent to `XXH3_64bits()`.
*/
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_reset(XXH3_state_t* statePtr);
/*
* XXH3_64bits_reset_withSeed():
* Generate a custom secret from `seed`, and store it into `statePtr`.
* digest will be equivalent to `XXH3_64bits_withSeed()`.
*/
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_reset_withSeed(XXH3_state_t* statePtr, XXH64_hash_t seed);
/*
* XXH3_64bits_reset_withSecret():
* `secret` is referenced, it _must outlive_ the hash streaming session.
* Similar to one-shot API, `secretSize` must be >= `XXH3_SECRET_SIZE_MIN`,
* and the quality of the hash depends on secret's entropy,
* meaning that the secret should look like a bunch of random bytes.
* When in doubt about the randomness of a candidate `secret`,
* consider employing `XXH3_generateSecret()` instead (see below).
*/
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_reset_withSecret(XXH3_state_t* statePtr, const void* secret, size_t secretSize);
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_update (XXH3_state_t* statePtr, const void* input, size_t length);
XXH_PUBLIC_API XXH64_hash_t XXH3_64bits_digest (const XXH3_state_t* statePtr);
/* 128-bit */
#ifdef XXH_NAMESPACE
# define XXH128 XXH_NAME2(XXH_NAMESPACE, XXH128)
# define XXH3_128bits XXH_NAME2(XXH_NAMESPACE, XXH3_128bits)
# define XXH3_128bits_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_withSeed)
# define XXH3_128bits_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_withSecret)
# define XXH3_128bits_reset XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset)
# define XXH3_128bits_reset_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset_withSeed)
# define XXH3_128bits_reset_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset_withSecret)
# define XXH3_128bits_update XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_update)
# define XXH3_128bits_digest XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_digest)
# define XXH128_isEqual XXH_NAME2(XXH_NAMESPACE, XXH128_isEqual)
# define XXH128_cmp XXH_NAME2(XXH_NAMESPACE, XXH128_cmp)
# define XXH128_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH128_canonicalFromHash)
# define XXH128_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH128_hashFromCanonical)
#endif
typedef struct {
XXH64_hash_t low64;
XXH64_hash_t high64;
} XXH128_hash_t;
XXH_PUBLIC_API XXH128_hash_t XXH128(const void* data, size_t len, XXH64_hash_t seed);
XXH_PUBLIC_API XXH128_hash_t XXH3_128bits(const void* data, size_t len);
XXH_PUBLIC_API XXH128_hash_t XXH3_128bits_withSeed(const void* data, size_t len, XXH64_hash_t seed); /* == XXH128() */
XXH_PUBLIC_API XXH128_hash_t XXH3_128bits_withSecret(const void* data, size_t len, const void* secret, size_t secretSize);
XXH_PUBLIC_API XXH_errorcode XXH3_128bits_reset(XXH3_state_t* statePtr);
XXH_PUBLIC_API XXH_errorcode XXH3_128bits_reset_withSeed(XXH3_state_t* statePtr, XXH64_hash_t seed);
XXH_PUBLIC_API XXH_errorcode XXH3_128bits_reset_withSecret(XXH3_state_t* statePtr, const void* secret, size_t secretSize);
XXH_PUBLIC_API XXH_errorcode XXH3_128bits_update (XXH3_state_t* statePtr, const void* input, size_t length);
XXH_PUBLIC_API XXH128_hash_t XXH3_128bits_digest (const XXH3_state_t* statePtr);
/* Note: For better performance, these functions can be inlined using XXH_INLINE_ALL */
/*!
* XXH128_isEqual():
* Return: 1 if `h1` and `h2` are equal, 0 if they are not.
*/
XXH_PUBLIC_API int XXH128_isEqual(XXH128_hash_t h1, XXH128_hash_t h2);
/*!
* XXH128_cmp():
*
* This comparator is compatible with stdlib's `qsort()`/`bsearch()`.
*
* return: >0 if *h128_1 > *h128_2
* =0 if *h128_1 == *h128_2
* <0 if *h128_1 < *h128_2
*/
XXH_PUBLIC_API int XXH128_cmp(const void* h128_1, const void* h128_2);
/******* Canonical representation *******/
typedef struct { unsigned char digest[sizeof(XXH128_hash_t)]; } XXH128_canonical_t;
XXH_PUBLIC_API void XXH128_canonicalFromHash(XXH128_canonical_t* dst, XXH128_hash_t hash);
XXH_PUBLIC_API XXH128_hash_t XXH128_hashFromCanonical(const XXH128_canonical_t* src);
/* === Experimental API === */
/* Symbols defined below must be considered tied to a specific library version. */
/*
* XXH3_generateSecret():
*
* Derive a high-entropy secret from any user-defined content, named customSeed.
* The generated secret can be used in combination with `*_withSecret()` functions.
* The `_withSecret()` variants are useful to provide a higher level of protection than 64-bit seed,
* as it becomes much more difficult for an external actor to guess how to impact the calculation logic.
*
* The function accepts as input a custom seed of any length and any content,
* and derives from it a high-entropy secret of length XXH3_SECRET_DEFAULT_SIZE
* into an already allocated buffer secretBuffer.
* The generated secret is _always_ XXH_SECRET_DEFAULT_SIZE bytes long.
*
* The generated secret can then be used with any `*_withSecret()` variant.
* Functions `XXH3_128bits_withSecret()`, `XXH3_64bits_withSecret()`,
* `XXH3_128bits_reset_withSecret()` and `XXH3_64bits_reset_withSecret()`
* are part of this list. They all accept a `secret` parameter
* which must be very long for implementation reasons (>= XXH3_SECRET_SIZE_MIN)
* _and_ feature very high entropy (consist of random-looking bytes).
* These conditions can be a high bar to meet, so
* this function can be used to generate a secret of proper quality.
*
* customSeed can be anything. It can have any size, even small ones,
* and its content can be anything, even stupidly "low entropy" source such as a bunch of zeroes.
* The resulting `secret` will nonetheless provide all expected qualities.
*
* Supplying NULL as the customSeed copies the default secret into `secretBuffer`.
* When customSeedSize > 0, supplying NULL as customSeed is undefined behavior.
*/
XXH_PUBLIC_API void XXH3_generateSecret(void* secretBuffer, const void* customSeed, size_t customSeedSize);
#endif /* XXH_NO_LONG_LONG */
#if defined(XXH_INLINE_ALL) || defined(XXH_PRIVATE_API)
# define XXH_IMPLEMENTATION
#endif
#endif /* defined(XXH_STATIC_LINKING_ONLY) && !defined(XXHASH_H_STATIC_13879238742) */
/* ======================================================================== */
/* ======================================================================== */
/* ======================================================================== */
/*-**********************************************************************
* xxHash implementation
*-**********************************************************************
* xxHash's implementation used to be found in xxhash.c.
*
* However, code inlining requires the implementation to be visible to the
* compiler, usually within the header.
*
* As a workaround, xxhash.c used to be included within xxhash.h. This caused
* some issues with some build systems, especially ones which treat .c files
* as source files.
*
* Therefore, the implementation is now directly integrated within xxhash.h.
* Another small advantage is that xxhash.c is no longer needed in /include.
************************************************************************/
#if ( defined(XXH_INLINE_ALL) || defined(XXH_PRIVATE_API) \
|| defined(XXH_IMPLEMENTATION) ) && !defined(XXH_IMPLEM_13a8737387)
# define XXH_IMPLEM_13a8737387
/* *************************************
* Tuning parameters
***************************************/
/*!
* XXH_FORCE_MEMORY_ACCESS:
* By default, access to unaligned memory is controlled by `memcpy()`, which is
* safe and portable.
*
* Unfortunately, on some target/compiler combinations, the generated assembly
* is sub-optimal.
*
* The below switch allow to select a different access method for improved
* performance.
* Method 0 (default):
* Use `memcpy()`. Safe and portable.
* Method 1:
* `__attribute__((packed))` statement. It depends on compiler extensions
* and is therefore not portable.
* This method is safe if your compiler supports it, and *generally* as
* fast or faster than `memcpy`.
* Method 2:
* Direct access via cast. This method doesn't depend on the compiler but
* violates the C standard.
* It can generate buggy code on targets which do not support unaligned
* memory accesses.
* But in some circumstances, it's the only known way to get the most
* performance (ie GCC + ARMv6)
* Method 3:
* Byteshift. This can generate the best code on old compilers which don't
* inline small `memcpy()` calls, and it might also be faster on big-endian
* systems which lack a native byteswap instruction.
* See https://stackoverflow.com/a/32095106/646947 for details.
* Prefer these methods in priority order (0 > 1 > 2 > 3)
*/
#ifndef XXH_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */
# if !defined(__clang__) && defined(__GNUC__) && defined(__ARM_FEATURE_UNALIGNED) && defined(__ARM_ARCH) && (__ARM_ARCH == 6)
# define XXH_FORCE_MEMORY_ACCESS 2
# elif !defined(__clang__) && ((defined(__INTEL_COMPILER) && !defined(_WIN32)) || \
(defined(__GNUC__) && (defined(__ARM_ARCH) && __ARM_ARCH >= 7)))
# define XXH_FORCE_MEMORY_ACCESS 1
# endif
#endif
/*!
* XXH_ACCEPT_NULL_INPUT_POINTER:
* If the input pointer is NULL, xxHash's default behavior is to dereference it,
* triggering a segfault.
* When this macro is enabled, xxHash actively checks the input for a null pointer.
* If it is, the result for null input pointers is the same as a zero-length input.
*/
#ifndef XXH_ACCEPT_NULL_INPUT_POINTER /* can be defined externally */
# define XXH_ACCEPT_NULL_INPUT_POINTER 0
#endif
/*!
* XXH_FORCE_ALIGN_CHECK:
* This is an important performance trick
* for architectures without decent unaligned memory access performance.
* It checks for input alignment, and when conditions are met,
* uses a "fast path" employing direct 32-bit/64-bit read,
* resulting in _dramatically faster_ read speed.
*
* The check costs one initial branch per hash, which is generally negligible, but not zero.
* Moreover, it's not useful to generate binary for an additional code path
* if memory access uses same instruction for both aligned and unaligned adresses.
*
* In these cases, the alignment check can be removed by setting this macro to 0.
* Then the code will always use unaligned memory access.
* Align check is automatically disabled on x86, x64 & arm64,
* which are platforms known to offer good unaligned memory accesses performance.
*
* This option does not affect XXH3 (only XXH32 and XXH64).
*/
#ifndef XXH_FORCE_ALIGN_CHECK /* can be defined externally */
# if defined(__i386) || defined(__x86_64__) || defined(__aarch64__) \
|| defined(_M_IX86) || defined(_M_X64) || defined(_M_ARM64) /* visual */
# define XXH_FORCE_ALIGN_CHECK 0
# else
# define XXH_FORCE_ALIGN_CHECK 1
# endif
#endif
/*!
* XXH_NO_INLINE_HINTS:
*
* By default, xxHash tries to force the compiler to inline almost all internal
* functions.
*
* This can usually improve performance due to reduced jumping and improved
* constant folding, but significantly increases the size of the binary which
* might not be favorable.
*
* Additionally, sometimes the forced inlining can be detrimental to performance,
* depending on the architecture.
*
* XXH_NO_INLINE_HINTS marks all internal functions as static, giving the
* compiler full control on whether to inline or not.
*
* When not optimizing (-O0), optimizing for size (-Os, -Oz), or using
* -fno-inline with GCC or Clang, this will automatically be defined.
*/
#ifndef XXH_NO_INLINE_HINTS
# if defined(__OPTIMIZE_SIZE__) /* -Os, -Oz */ \
|| defined(__NO_INLINE__) /* -O0, -fno-inline */
# define XXH_NO_INLINE_HINTS 1
# else
# define XXH_NO_INLINE_HINTS 0
# endif
#endif
/*!
* XXH_REROLL:
* Whether to reroll XXH32_finalize, and XXH64_finalize,
* instead of using an unrolled jump table/if statement loop.
*
* This is automatically defined on -Os/-Oz on GCC and Clang.
*/
#ifndef XXH_REROLL
# if defined(__OPTIMIZE_SIZE__)
# define XXH_REROLL 1
# else
# define XXH_REROLL 0
# endif
#endif
/* *************************************
* Includes & Memory related functions
***************************************/
/*!
* Modify the local functions below should you wish to use some other memory
* routines for malloc() and free()
*/
#include <stdlib.h>
static void* XXH_malloc(size_t s) { return malloc(s); }
static void XXH_free(void* p) { free(p); }
/*! and for memcpy() */
#include <string.h>
static void* XXH_memcpy(void* dest, const void* src, size_t size)
{
return memcpy(dest,src,size);
}
#include <limits.h> /* ULLONG_MAX */
/* *************************************
* Compiler Specific Options
***************************************/
#ifdef _MSC_VER /* Visual Studio warning fix */
# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
#endif
#if XXH_NO_INLINE_HINTS /* disable inlining hints */
# if defined(__GNUC__)
# define XXH_FORCE_INLINE static __attribute__((unused))
# else
# define XXH_FORCE_INLINE static
# endif
# define XXH_NO_INLINE static
/* enable inlining hints */
#elif defined(_MSC_VER) /* Visual Studio */
# define XXH_FORCE_INLINE static __forceinline
# define XXH_NO_INLINE static __declspec(noinline)
#elif defined(__GNUC__)
# define XXH_FORCE_INLINE static __inline__ __attribute__((always_inline, unused))
# define XXH_NO_INLINE static __attribute__((noinline))
#elif defined (__cplusplus) \
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) /* C99 */
# define XXH_FORCE_INLINE static inline
# define XXH_NO_INLINE static
#else
# define XXH_FORCE_INLINE static
# define XXH_NO_INLINE static
#endif
/* *************************************
* Debug
***************************************/
/*
* XXH_DEBUGLEVEL is expected to be defined externally, typically via the
* compiler's command line options. The value must be a number.
*/
#ifndef XXH_DEBUGLEVEL
# ifdef DEBUGLEVEL /* backwards compat */
# define XXH_DEBUGLEVEL DEBUGLEVEL
# else
# define XXH_DEBUGLEVEL 0
# endif
#endif
#if (XXH_DEBUGLEVEL>=1)
# include <assert.h> /* note: can still be disabled with NDEBUG */
# define XXH_ASSERT(c) assert(c)
#else
# define XXH_ASSERT(c) ((void)0)
#endif
/* note: use after variable declarations */
#define XXH_STATIC_ASSERT(c) do { enum { XXH_sa = 1/(int)(!!(c)) }; } while (0)
/* *************************************
* Basic Types
***************************************/
#if !defined (__VMS) \
&& (defined (__cplusplus) \
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
# include <stdint.h>
typedef uint8_t xxh_u8;
#else
typedef unsigned char xxh_u8;
#endif
typedef XXH32_hash_t xxh_u32;
#ifdef XXH_OLD_NAMES
# define BYTE xxh_u8
# define U8 xxh_u8
# define U32 xxh_u32
#endif
/* *** Memory access *** */
#if (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==3))
/*
* Manual byteshift. Best for old compilers which don't inline memcpy.
* We actually directly use XXH_readLE32 and XXH_readBE32.
*/
#elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==2))
/*
* Force direct memory access. Only works on CPU which support unaligned memory
* access in hardware.
*/
static xxh_u32 XXH_read32(const void* memPtr) { return *(const xxh_u32*) memPtr; }
#elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==1))
/*
* __pack instructions are safer but compiler specific, hence potentially
* problematic for some compilers.
*
* Currently only defined for GCC and ICC.
*/
#ifdef XXH_OLD_NAMES
typedef union { xxh_u32 u32; } __attribute__((packed)) unalign;
#endif
static xxh_u32 XXH_read32(const void* ptr)
{
typedef union { xxh_u32 u32; } __attribute__((packed)) xxh_unalign;