1StdLabels.Bytes(3)               OCaml library              StdLabels.Bytes(3)
2
3
4

NAME

6       StdLabels.Bytes - no description
7

Module

9       Module   StdLabels.Bytes
10

Documentation

12       Module Bytes
13        : (module BytesLabels)
14
15
16
17
18
19
20
21
22       val length : bytes -> int
23
24       Return the length (number of bytes) of the argument.
25
26
27
28       val get : bytes -> int -> char
29
30
31       get s n returns the byte at index n in argument s .
32
33
34       Raises Invalid_argument if n is not a valid index in s .
35
36
37
38       val set : bytes -> int -> char -> unit
39
40
41       set s n c modifies s in place, replacing the byte at index n with c .
42
43
44       Raises Invalid_argument if n is not a valid index in s .
45
46
47
48       val create : int -> bytes
49
50
51       create  n  returns  a  new  byte sequence of length n . The sequence is
52       uninitialized and contains arbitrary bytes.
53
54
55       Raises Invalid_argument if n < 0 or n > Sys.max_string_length .
56
57
58
59       val make : int -> char -> bytes
60
61
62       make n c returns a new byte sequence of length n , filled with the byte
63       c .
64
65
66       Raises Invalid_argument if n < 0 or n > Sys.max_string_length .
67
68
69
70       val init : int -> f:(int -> char) -> bytes
71
72
73       init  n  f returns a fresh byte sequence of length n , with character i
74       initialized to the result of f i (in increasing index order).
75
76
77       Raises Invalid_argument if n < 0 or n > Sys.max_string_length .
78
79
80
81       val empty : bytes
82
83       A byte sequence of size 0.
84
85
86
87       val copy : bytes -> bytes
88
89       Return a new byte sequence that contains the same bytes  as  the  argu‐
90       ment.
91
92
93
94       val of_string : string -> bytes
95
96       Return  a  new  byte sequence that contains the same bytes as the given
97       string.
98
99
100
101       val to_string : bytes -> string
102
103       Return a new string that contains the same bytes as the given byte  se‐
104       quence.
105
106
107
108       val sub : bytes -> pos:int -> len:int -> bytes
109
110
111       sub  s ~pos ~len returns a new byte sequence of length len , containing
112       the subsequence of s that starts at position pos and has length len .
113
114
115       Raises Invalid_argument if pos and len do not designate a  valid  range
116       of s .
117
118
119
120       val sub_string : bytes -> pos:int -> len:int -> string
121
122       Same as BytesLabels.sub but return a string instead of a byte sequence.
123
124
125
126       val extend : bytes -> left:int -> right:int -> bytes
127
128
129       extend  s  ~left  ~right  returns a new byte sequence that contains the
130       bytes of s , with left uninitialized bytes prepended and  right  unini‐
131       tialized bytes appended to it. If left or right is negative, then bytes
132       are removed (instead of appended) from the corresponding side of s .
133
134
135       Since 4.05.0 in BytesLabels
136
137
138       Raises Invalid_argument if the result length is negative or longer than
139       Sys.max_string_length bytes.
140
141
142
143       val fill : bytes -> pos:int -> len:int -> char -> unit
144
145
146       fill s ~pos ~len c modifies s in place, replacing len characters with c
147       , starting at pos .
148
149
150       Raises Invalid_argument if pos and len do not designate a  valid  range
151       of s .
152
153
154
155       val  blit  :  src:bytes  ->  src_pos:int -> dst:bytes -> dst_pos:int ->
156       len:int -> unit
157
158
159       blit ~src ~src_pos ~dst ~dst_pos ~len copies len  bytes  from  sequence
160       src  ,  starting at index src_pos , to sequence dst , starting at index
161       dst_pos . It works correctly even if src and dst are the same byte  se‐
162       quence, and the source and destination intervals overlap.
163
164
165       Raises  Invalid_argument  if  src_pos  and len do not designate a valid
166       range of src , or if dst_pos and len do not designate a valid range  of
167       dst .
168
169
170
171       val blit_string : src:string -> src_pos:int -> dst:bytes -> dst_pos:int
172       -> len:int -> unit
173
174
175       blit ~src ~src_pos ~dst ~dst_pos ~len copies len bytes from string  src
176       ,  starting at index src_pos , to byte sequence dst , starting at index
177       dst_pos .
178
179
180       Since 4.05.0 in BytesLabels
181
182
183       Raises Invalid_argument if src_pos and len do  not  designate  a  valid
184       range  of src , or if dst_pos and len do not designate a valid range of
185       dst .
186
187
188
189       val concat : sep:bytes -> bytes list -> bytes
190
191
192       concat ~sep sl concatenates the list of byte sequences sl  ,  inserting
193       the separator byte sequence sep between each, and returns the result as
194       a new byte sequence.
195
196
197       Raises   Invalid_argument   if    the    result    is    longer    than
198       Sys.max_string_length bytes.
199
200
201
202       val cat : bytes -> bytes -> bytes
203
204
205       cat  s1  s2 concatenates s1 and s2 and returns the result as a new byte
206       sequence.
207
208
209       Since 4.05.0 in BytesLabels
210
211
212       Raises   Invalid_argument   if    the    result    is    longer    than
213       Sys.max_string_length bytes.
214
215
216
217       val iter : f:(char -> unit) -> bytes -> unit
218
219
220       iter  ~f  s  applies  function f in turn to all the bytes of s .  It is
221       equivalent to f (get s 0); f (get s 1); ...; f (get s
222           (length s - 1)); () .
223
224
225
226       val iteri : f:(int -> char -> unit) -> bytes -> unit
227
228       Same as BytesLabels.iter , but the function is applied to the index  of
229       the byte as first argument and the byte itself as second argument.
230
231
232
233       val map : f:(char -> char) -> bytes -> bytes
234
235
236       map  ~f s applies function f in turn to all the bytes of s (in increas‐
237       ing index order) and stores the resulting bytes in a new sequence  that
238       is returned as the result.
239
240
241
242       val mapi : f:(int -> char -> char) -> bytes -> bytes
243
244
245       mapi ~f s calls f with each character of s and its index (in increasing
246       index order) and stores the resulting bytes in a new sequence  that  is
247       returned as the result.
248
249
250
251       val trim : bytes -> bytes
252
253       Return a copy of the argument, without leading and trailing whitespace.
254       The bytes regarded as whitespace are the ASCII characters ' ' ,  '\012'
255       , '\n' , '\r' , and '\t' .
256
257
258
259       val escaped : bytes -> bytes
260
261       Return  a  copy of the argument, with special characters represented by
262       escape sequences, following the  lexical  conventions  of  OCaml.   All
263       characters  outside the ASCII printable range (32..126) are escaped, as
264       well as backslash and double-quote.
265
266
267       Raises   Invalid_argument   if    the    result    is    longer    than
268       Sys.max_string_length bytes.
269
270
271
272       val index : bytes -> char -> int
273
274
275       index s c returns the index of the first occurrence of byte c in s .
276
277
278       Raises Not_found if c does not occur in s .
279
280
281
282       val index_opt : bytes -> char -> int option
283
284
285       index_opt  s c returns the index of the first occurrence of byte c in s
286       or None if c does not occur in s .
287
288
289       Since 4.05
290
291
292
293       val rindex : bytes -> char -> int
294
295
296       rindex s c returns the index of the last occurrence of byte c in s .
297
298
299       Raises Not_found if c does not occur in s .
300
301
302
303       val rindex_opt : bytes -> char -> int option
304
305
306       rindex_opt s c returns the index of the last occurrence of byte c in  s
307       or None if c does not occur in s .
308
309
310       Since 4.05
311
312
313
314       val index_from : bytes -> int -> char -> int
315
316
317       index_from s i c returns the index of the first occurrence of byte c in
318       s after position i .  index s c is equivalent to index_from s 0 c .
319
320
321       Raises Invalid_argument if i is not a valid position in s .
322
323
324       Raises Not_found if c does not occur in s after position i .
325
326
327
328       val index_from_opt : bytes -> int -> char -> int option
329
330
331       index_from_opt s i c returns the index of the first occurrence of  byte
332       c in s after position i or None if c does not occur in s after position
333       i .  index_opt s c is equivalent to index_from_opt s 0 c .
334
335
336       Since 4.05
337
338
339       Raises Invalid_argument if i is not a valid position in s .
340
341
342
343       val rindex_from : bytes -> int -> char -> int
344
345
346       rindex_from s i c returns the index of the last occurrence of byte c in
347       s  before  position  i+1  .   rindex s c is equivalent to rindex_from s
348       (length s - 1) c .
349
350
351       Raises Invalid_argument if i+1 is not a valid position in s .
352
353
354       Raises Not_found if c does not occur in s before position i+1 .
355
356
357
358       val rindex_from_opt : bytes -> int -> char -> int option
359
360
361       rindex_from_opt s i c returns the index of the last occurrence of  byte
362       c  in s before position i+1 or None if c does not occur in s before po‐
363       sition i+1 .  rindex_opt s c is equivalent to rindex_from s (length s -
364       1) c .
365
366
367       Since 4.05
368
369
370       Raises Invalid_argument if i+1 is not a valid position in s .
371
372
373
374       val contains : bytes -> char -> bool
375
376
377       contains s c tests if byte c appears in s .
378
379
380
381       val contains_from : bytes -> int -> char -> bool
382
383
384       contains_from  s  start  c  tests if byte c appears in s after position
385       start .  contains s c is equivalent to contains_from
386           s 0 c .
387
388
389       Raises Invalid_argument if start is not a valid position in s .
390
391
392
393       val rcontains_from : bytes -> int -> char -> bool
394
395
396       rcontains_from s stop c tests if byte c appears in  s  before  position
397       stop+1 .
398
399
400       Raises  Invalid_argument  if stop < 0 or stop+1 is not a valid position
401       in s .
402
403
404
405       val uppercase : bytes -> bytes
406
407       Deprecated.  Functions operating on Latin-1 character  set  are  depre‐
408       cated.
409
410
411       Return a copy of the argument, with all lowercase letters translated to
412       uppercase, including accented letters of the ISO Latin-1 (8859-1) char‐
413       acter set.
414
415
416
417       val lowercase : bytes -> bytes
418
419       Deprecated.   Functions  operating  on Latin-1 character set are depre‐
420       cated.
421
422
423       Return a copy of the argument, with all uppercase letters translated to
424       lowercase, including accented letters of the ISO Latin-1 (8859-1) char‐
425       acter set.
426
427
428
429       val capitalize : bytes -> bytes
430
431       Deprecated.  Functions operating on Latin-1 character  set  are  depre‐
432       cated.
433
434
435       Return  a  copy of the argument, with the first character set to upper‐
436       case, using the ISO Latin-1 (8859-1) character set.
437
438
439
440       val uncapitalize : bytes -> bytes
441
442       Deprecated.  Functions operating on Latin-1 character  set  are  depre‐
443       cated.
444
445
446       Return  a  copy of the argument, with the first character set to lower‐
447       case, using the ISO Latin-1 (8859-1) character set.
448
449
450
451       val uppercase_ascii : bytes -> bytes
452
453       Return a copy of the argument, with all lowercase letters translated to
454       uppercase, using the US-ASCII character set.
455
456
457       Since 4.05.0
458
459
460
461       val lowercase_ascii : bytes -> bytes
462
463       Return a copy of the argument, with all uppercase letters translated to
464       lowercase, using the US-ASCII character set.
465
466
467       Since 4.05.0
468
469
470
471       val capitalize_ascii : bytes -> bytes
472
473       Return a copy of the argument, with the first character set  to  upper‐
474       case, using the US-ASCII character set.
475
476
477       Since 4.05.0
478
479
480
481       val uncapitalize_ascii : bytes -> bytes
482
483       Return  a  copy of the argument, with the first character set to lower‐
484       case, using the US-ASCII character set.
485
486
487       Since 4.05.0
488
489
490       type t = bytes
491
492
493       An alias for the type of byte sequences.
494
495
496
497       val compare : t -> t -> int
498
499       The comparison function for byte sequences, with the same specification
500       as  compare .  Along with the type t , this function compare allows the
501       module Bytes to be passed as argument  to  the  functors  Set.Make  and
502       Map.Make .
503
504
505
506       val equal : t -> t -> bool
507
508       The equality function for byte sequences.
509
510
511       Since 4.05.0
512
513
514
515
516   Unsafe conversions (for advanced users)
517       This  section  describes unsafe, low-level conversion functions between
518       bytes and string . They do not copy the internal data; used improperly,
519       they  can  break  the immutability invariant on strings provided by the
520       -safe-string option. They are available for expert library authors, but
521       for   most   purposes   you  should  use  the  always-correct  BytesLa‐
522       bels.to_string and BytesLabels.of_string instead.
523
524       val unsafe_to_string : bytes -> string
525
526       Unsafely convert a byte sequence into a string.
527
528       To reason about the use of unsafe_to_string , it is convenient to  con‐
529       sider  an "ownership" discipline. A piece of code that manipulates some
530       data "owns" it; there are several disjoint ownership modes, including:
531
532       -Unique ownership: the data may be accessed and mutated
533
534       -Shared ownership: the data has several owners, that  may  only  access
535       it, not mutate it.
536
537       Unique  ownership  is linear: passing the data to another piece of code
538       means giving up ownership (we cannot write the data  again).  A  unique
539       owner  may decide to make the data shared (giving up mutation rights on
540       it), but shared data may not become uniquely-owned again.
541
542
543       unsafe_to_string s can only be used when the caller owns the  byte  se‐
544       quence  s  --  either  uniquely or as shared immutable data. The caller
545       gives up ownership of s , and gains ownership of the returned string.
546
547       There are two valid use-cases that respect this ownership discipline:
548
549       1. Creating a string by initializing and mutating a byte sequence  that
550       is never changed after initialization is performed.
551
552
553       let string_init len f : string =
554         let s = Bytes.create len in
555         for i = 0 to len - 1 do Bytes.set s i (f i) done;
556         Bytes.unsafe_to_string s
557
558
559       This  function  is  safe  because the byte sequence s will never be ac‐
560       cessed or mutated after unsafe_to_string  is  called.  The  string_init
561       code gives up ownership of s , and returns the ownership of the result‐
562       ing string to its caller.
563
564       Note that it would be unsafe if s was passed as an additional parameter
565       to the function f as it could escape this way and be mutated in the fu‐
566       ture -- string_init would give up ownership of s to pass it to f ,  and
567       could not call unsafe_to_string safely.
568
569       We have provided the String.init , String.map and String.mapi functions
570       to cover most cases of building new strings. You  should  prefer  those
571       over to_string or unsafe_to_string whenever applicable.
572
573       2.  Temporarily  giving ownership of a byte sequence to a function that
574       expects a uniquely owned string and returns ownership back, so that  we
575       can mutate the sequence again after the call ended.
576
577
578       let bytes_length (s : bytes) =
579         String.length (Bytes.unsafe_to_string s)
580
581
582       In  this use-case, we do not promise that s will never be mutated after
583       the call to bytes_length s .  The  String.length  function  temporarily
584       borrows  unique ownership of the byte sequence (and sees it as a string
585       ), but returns this ownership back to the caller, which may assume that
586       s is still a valid byte sequence after the call. Note that this is only
587       correct because we know that String.length does not capture  its  argu‐
588       ment  -- it could escape by a side-channel such as a memoization combi‐
589       nator.
590
591       The caller may not mutate s while the string is borrowed (it has tempo‐
592       rarily  given up ownership). This affects concurrent programs, but also
593       higher-order functions: if  String.length  returned  a  closure  to  be
594       called  later,  s should not be mutated until this closure is fully ap‐
595       plied and returns ownership.
596
597
598
599       val unsafe_of_string : string -> bytes
600
601       Unsafely convert a shared string to a byte sequence that should not  be
602       mutated.
603
604       The  same  ownership discipline that makes unsafe_to_string correct ap‐
605       plies to unsafe_of_string : you may use it if you were the owner of the
606       string value, and you will own the return bytes in the same mode.
607
608       In  practice,  unique ownership of string values is extremely difficult
609       to reason about correctly. You should always assume strings are shared,
610       never uniquely owned.
611
612       For  example, string literals are implicitly shared by the compiler, so
613       you never uniquely own them.
614
615
616       let incorrect = Bytes.unsafe_of_string "hello"
617       let s = Bytes.of_string "hello"
618
619
620       The first declaration is incorrect, because the string literal  "hello"
621       could  be  shared  by the compiler with other parts of the program, and
622       mutating incorrect is a bug. You must always use  the  second  version,
623       which performs a copy and is thus correct.
624
625       Assuming  unique ownership of strings that are not string literals, but
626       are (partly) built from string literals, is also incorrect.  For  exam‐
627       ple,  mutating  unsafe_of_string  ("foo"  ^  s) could mutate the shared
628       string "foo" -- assuming a rope-like representation  of  strings.  More
629       generally, functions operating on strings will assume shared ownership,
630       they do not preserve unique ownership. It is thus incorrect  to  assume
631       unique ownership of the result of unsafe_of_string .
632
633       The  only case we have reasonable confidence is safe is if the produced
634       bytes is shared -- used as an immutable byte sequence. This is possibly
635       useful  for incremental migration of low-level programs that manipulate
636       immutable sequences of bytes (for example Marshal.from_bytes ) and pre‐
637       viously used the string type for this purpose.
638
639
640
641
642   Iterators
643       val to_seq : t -> char Seq.t
644
645       Iterate  on the string, in increasing index order. Modifications of the
646       string during iteration will be reflected in the iterator.
647
648
649       Since 4.07
650
651
652
653       val to_seqi : t -> (int * char) Seq.t
654
655       Iterate on the string, in  increasing  order,  yielding  indices  along
656       chars
657
658
659       Since 4.07
660
661
662
663       val of_seq : char Seq.t -> t
664
665       Create a string from the generator
666
667
668       Since 4.07
669
670
671
672
673   Binary encoding/decoding of integers
674       The  functions in this section binary encode and decode integers to and
675       from byte sequences.
676
677       All following functions raise Invalid_argument if the space  needed  at
678       index i to decode or encode the integer is not available.
679
680       Little-endian (resp. big-endian) encoding means that least (resp. most)
681       significant bytes are stored first.  Big-endian is also known  as  net‐
682       work  byte  order.   Native-endian  encoding is either little-endian or
683       big-endian depending on Sys.big_endian .
684
685       32-bit and 64-bit integers are  represented  by  the  int32  and  int64
686       types, which can be interpreted either as signed or unsigned numbers.
687
688       8-bit  and  16-bit  integers are represented by the int type, which has
689       more bits than the binary encoding.  These extra bits  are  handled  as
690       follows:
691
692       -Functions that decode signed (resp. unsigned) 8-bit or 16-bit integers
693       represented by int values sign-extend (resp. zero-extend) their result.
694
695       -Functions that encode 8-bit or 16-bit integers represented by int val‐
696       ues truncate their input to their least significant bytes.
697
698
699       val get_uint8 : bytes -> int -> int
700
701
702       get_uint8 b i is b 's unsigned 8-bit integer starting at byte index i .
703
704
705       Since 4.08
706
707
708
709       val get_int8 : bytes -> int -> int
710
711
712       get_int8 b i is b 's signed 8-bit integer starting at byte index i .
713
714
715       Since 4.08
716
717
718
719       val get_uint16_ne : bytes -> int -> int
720
721
722       get_uint16_ne  b i is b 's native-endian unsigned 16-bit integer start‐
723       ing at byte index i .
724
725
726       Since 4.08
727
728
729
730       val get_uint16_be : bytes -> int -> int
731
732
733       get_uint16_be b i is b 's big-endian unsigned 16-bit  integer  starting
734       at byte index i .
735
736
737       Since 4.08
738
739
740
741       val get_uint16_le : bytes -> int -> int
742
743
744       get_uint16_le  b i is b 's little-endian unsigned 16-bit integer start‐
745       ing at byte index i .
746
747
748       Since 4.08
749
750
751
752       val get_int16_ne : bytes -> int -> int
753
754
755       get_int16_ne b i is b 's native-endian signed 16-bit  integer  starting
756       at byte index i .
757
758
759       Since 4.08
760
761
762
763       val get_int16_be : bytes -> int -> int
764
765
766       get_int16_be  b  i is b 's big-endian signed 16-bit integer starting at
767       byte index i .
768
769
770       Since 4.08
771
772
773
774       val get_int16_le : bytes -> int -> int
775
776
777       get_int16_le b i is b 's little-endian signed 16-bit  integer  starting
778       at byte index i .
779
780
781       Since 4.08
782
783
784
785       val get_int32_ne : bytes -> int -> int32
786
787
788       get_int32_ne  b i is b 's native-endian 32-bit integer starting at byte
789       index i .
790
791
792       Since 4.08
793
794
795
796       val get_int32_be : bytes -> int -> int32
797
798
799       get_int32_be b i is b 's big-endian 32-bit integer starting at byte in‐
800       dex i .
801
802
803       Since 4.08
804
805
806
807       val get_int32_le : bytes -> int -> int32
808
809
810       get_int32_le  b i is b 's little-endian 32-bit integer starting at byte
811       index i .
812
813
814       Since 4.08
815
816
817
818       val get_int64_ne : bytes -> int -> int64
819
820
821       get_int64_ne b i is b 's native-endian 64-bit integer starting at  byte
822       index i .
823
824
825       Since 4.08
826
827
828
829       val get_int64_be : bytes -> int -> int64
830
831
832       get_int64_be b i is b 's big-endian 64-bit integer starting at byte in‐
833       dex i .
834
835
836       Since 4.08
837
838
839
840       val get_int64_le : bytes -> int -> int64
841
842
843       get_int64_le b i is b 's little-endian 64-bit integer starting at  byte
844       index i .
845
846
847       Since 4.08
848
849
850
851       val set_uint8 : bytes -> int -> int -> unit
852
853
854       set_uint8 b i v sets b 's unsigned 8-bit integer starting at byte index
855       i to v .
856
857
858       Since 4.08
859
860
861
862       val set_int8 : bytes -> int -> int -> unit
863
864
865       set_int8 b i v sets b 's signed 8-bit integer starting at byte index  i
866       to v .
867
868
869       Since 4.08
870
871
872
873       val set_uint16_ne : bytes -> int -> int -> unit
874
875
876       set_uint16_ne  b  i  v  sets b 's native-endian unsigned 16-bit integer
877       starting at byte index i to v .
878
879
880       Since 4.08
881
882
883
884       val set_uint16_be : bytes -> int -> int -> unit
885
886
887       set_uint16_be b i v sets b 's big-endian unsigned 16-bit integer start‐
888       ing at byte index i to v .
889
890
891       Since 4.08
892
893
894
895       val set_uint16_le : bytes -> int -> int -> unit
896
897
898       set_uint16_le  b  i  v  sets b 's little-endian unsigned 16-bit integer
899       starting at byte index i to v .
900
901
902       Since 4.08
903
904
905
906       val set_int16_ne : bytes -> int -> int -> unit
907
908
909       set_int16_ne b i v sets b 's native-endian signed 16-bit integer start‐
910       ing at byte index i to v .
911
912
913       Since 4.08
914
915
916
917       val set_int16_be : bytes -> int -> int -> unit
918
919
920       set_int16_be  b i v sets b 's big-endian signed 16-bit integer starting
921       at byte index i to v .
922
923
924       Since 4.08
925
926
927
928       val set_int16_le : bytes -> int -> int -> unit
929
930
931       set_int16_le b i v sets b 's little-endian signed 16-bit integer start‐
932       ing at byte index i to v .
933
934
935       Since 4.08
936
937
938
939       val set_int32_ne : bytes -> int -> int32 -> unit
940
941
942       set_int32_ne  b  i v sets b 's native-endian 32-bit integer starting at
943       byte index i to v .
944
945
946       Since 4.08
947
948
949
950       val set_int32_be : bytes -> int -> int32 -> unit
951
952
953       set_int32_be b i v sets b 's big-endian 32-bit integer starting at byte
954       index i to v .
955
956
957       Since 4.08
958
959
960
961       val set_int32_le : bytes -> int -> int32 -> unit
962
963
964       set_int32_le  b  i v sets b 's little-endian 32-bit integer starting at
965       byte index i to v .
966
967
968       Since 4.08
969
970
971
972       val set_int64_ne : bytes -> int -> int64 -> unit
973
974
975       set_int64_ne b i v sets b 's native-endian 64-bit integer  starting  at
976       byte index i to v .
977
978
979       Since 4.08
980
981
982
983       val set_int64_be : bytes -> int -> int64 -> unit
984
985
986       set_int64_be b i v sets b 's big-endian 64-bit integer starting at byte
987       index i to v .
988
989
990       Since 4.08
991
992
993
994       val set_int64_le : bytes -> int -> int64 -> unit
995
996
997       set_int64_le b i v sets b 's little-endian 64-bit integer  starting  at
998       byte index i to v .
999
1000
1001       Since 4.08
1002
1003
1004
1005
1006
1007OCamldoc                          2021-07-22                StdLabels.Bytes(3)
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