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

NAME

6       Bytes - Byte sequence operations.
7

Module

9       Module   Bytes
10

Documentation

12       Module Bytes
13        : sig end
14
15
16       Byte sequence operations.
17
18       A   byte   sequence  is  a  mutable  data  structure  that  contains  a
19       fixed-length sequence of bytes. Each byte can be  indexed  in  constant
20       time for reading or writing.
21
22       Given a byte sequence s of length l , we can access each of the l bytes
23       of s via its index in the sequence. Indexes start at 0 ,  and  we  will
24       call an index valid in s if it falls within the range [0...l-1] (inclu‐
25       sive). A position is the point between two bytes or at the beginning or
26       end  of the sequence.  We call a position valid in s if it falls within
27       the range [0...l] (inclusive). Note that the byte at index n is between
28       positions n and n+1 .
29
30       Two  parameters  start and len are said to designate a valid range of s
31       if len >= 0 and start and start+len are valid positions in s .
32
33       Byte sequences can be modified in place, for instance via the  set  and
34       blit  functions  described  below.   See also strings (module String ),
35       which are almost the same data structure, but  cannot  be  modified  in
36       place.
37
38       Bytes are represented by the OCaml type char .
39
40
41       Since 4.02.0
42
43
44
45
46
47
48       val length : bytes -> int
49
50       Return the length (number of bytes) of the argument.
51
52
53
54       val get : bytes -> int -> char
55
56
57       get s n returns the byte at index n in argument s .
58
59
60       Raises Invalid_argument if n is not a valid index in s .
61
62
63
64       val set : bytes -> int -> char -> unit
65
66
67       set s n c modifies s in place, replacing the byte at index n with c .
68
69
70       Raises Invalid_argument if n is not a valid index in s .
71
72
73
74       val create : int -> bytes
75
76
77       create  n  returns  a  new  byte sequence of length n . The sequence is
78       uninitialized and contains arbitrary bytes.
79
80
81       Raises Invalid_argument if n < 0 or n > Sys.max_string_length .
82
83
84
85       val make : int -> char -> bytes
86
87
88       make n c returns a new byte sequence of length n , filled with the byte
89       c .
90
91
92       Raises Invalid_argument if n < 0 or n > Sys.max_string_length .
93
94
95
96       val init : int -> (int -> char) -> bytes
97
98
99       Bytes.init n f returns a fresh byte sequence of length n , with charac‐
100       ter i initialized to the result of f i (in increasing index order).
101
102
103       Raises Invalid_argument if n < 0 or n > Sys.max_string_length .
104
105
106
107       val empty : bytes
108
109       A byte sequence of size 0.
110
111
112
113       val copy : bytes -> bytes
114
115       Return a new byte sequence that contains the same bytes  as  the  argu‐
116       ment.
117
118
119
120       val of_string : string -> bytes
121
122       Return  a  new  byte sequence that contains the same bytes as the given
123       string.
124
125
126
127       val to_string : bytes -> string
128
129       Return a new string that contains the same bytes as the given byte  se‐
130       quence.
131
132
133
134       val sub : bytes -> int -> int -> bytes
135
136
137       sub  s start len returns a new byte sequence of length len , containing
138       the subsequence of s that starts at position start and has length len .
139
140
141       Raises Invalid_argument if start and len do not designate a valid range
142       of s .
143
144
145
146       val sub_string : bytes -> int -> int -> string
147
148       Same as sub but return a string instead of a byte sequence.
149
150
151
152       val extend : bytes -> int -> int -> bytes
153
154
155       extend s left right returns a new byte sequence that contains the bytes
156       of s , with left uninitialized bytes prepended and right  uninitialized
157       bytes  appended to it. If left or right is negative, then bytes are re‐
158       moved (instead of appended) from the corresponding side of s .
159
160
161       Raises Invalid_argument if the result length is negative or longer than
162       Sys.max_string_length bytes.
163
164
165
166       val fill : bytes -> int -> int -> char -> unit
167
168
169       fill s start len c modifies s in place, replacing len characters with c
170       , starting at start .
171
172
173       Raises Invalid_argument if start and len do not designate a valid range
174       of s .
175
176
177
178       val blit : bytes -> int -> bytes -> int -> int -> unit
179
180
181       blit  src  srcoff  dst  dstoff len copies len bytes from sequence src ,
182       starting at index srcoff , to sequence dst , starting at index dstoff .
183       It  works correctly even if src and dst are the same byte sequence, and
184       the source and destination intervals overlap.
185
186
187       Raises Invalid_argument if srcoff and len  do  not  designate  a  valid
188       range  of  src , or if dstoff and len do not designate a valid range of
189       dst .
190
191
192
193       val blit_string : string -> int -> bytes -> int -> int -> unit
194
195
196       blit_string src srcoff dst dstoff len copies len bytes from string  src
197       ,  starting  at index srcoff , to byte sequence dst , starting at index
198       dstoff .
199
200
201       Raises Invalid_argument if srcoff and len  do  not  designate  a  valid
202       range  of  src , or if dstoff and len do not designate a valid range of
203       dst .
204
205
206
207       val concat : bytes -> bytes list -> bytes
208
209
210       concat sep sl concatenates the list of byte sequences  sl  ,  inserting
211       the separator byte sequence sep between each, and returns the result as
212       a new byte sequence.
213
214
215       Raises   Invalid_argument   if    the    result    is    longer    than
216       Sys.max_string_length bytes.
217
218
219
220       val cat : bytes -> bytes -> bytes
221
222
223       cat  s1  s2 concatenates s1 and s2 and returns the result as a new byte
224       sequence.
225
226
227       Raises   Invalid_argument   if    the    result    is    longer    than
228       Sys.max_string_length bytes.
229
230
231
232       val iter : (char -> unit) -> bytes -> unit
233
234
235       iter  f  s  applies  function  f in turn to all the bytes of s .  It is
236       equivalent to f (get s 0); f (get s 1); ...; f (get s
237           (length s - 1)); () .
238
239
240
241       val iteri : (int -> char -> unit) -> bytes -> unit
242
243       Same as Bytes.iter , but the function is applied to the  index  of  the
244       byte as first argument and the byte itself as second argument.
245
246
247
248       val map : (char -> char) -> bytes -> bytes
249
250
251       map f s applies function f in turn to all the bytes of s (in increasing
252       index order) and stores the resulting bytes in a new sequence  that  is
253       returned as the result.
254
255
256
257       val mapi : (int -> char -> char) -> bytes -> bytes
258
259
260       mapi  f s calls f with each character of s and its index (in increasing
261       index order) and stores the resulting bytes in a new sequence  that  is
262       returned as the result.
263
264
265
266       val trim : bytes -> bytes
267
268       Return a copy of the argument, without leading and trailing whitespace.
269       The bytes regarded as whitespace are the ASCII characters ' ' ,  '\012'
270       , '\n' , '\r' , and '\t' .
271
272
273
274       val escaped : bytes -> bytes
275
276       Return  a  copy of the argument, with special characters represented by
277       escape sequences, following the  lexical  conventions  of  OCaml.   All
278       characters  outside the ASCII printable range (32..126) are escaped, as
279       well as backslash and double-quote.
280
281
282       Raises   Invalid_argument   if    the    result    is    longer    than
283       Sys.max_string_length bytes.
284
285
286
287       val index : bytes -> char -> int
288
289
290       index s c returns the index of the first occurrence of byte c in s .
291
292
293       Raises Not_found if c does not occur in s .
294
295
296
297       val index_opt : bytes -> char -> int option
298
299
300       index_opt  s c returns the index of the first occurrence of byte c in s
301       or None if c does not occur in s .
302
303
304       Since 4.05
305
306
307
308       val rindex : bytes -> char -> int
309
310
311       rindex s c returns the index of the last occurrence of byte c in s .
312
313
314       Raises Not_found if c does not occur in s .
315
316
317
318       val rindex_opt : bytes -> char -> int option
319
320
321       rindex_opt s c returns the index of the last occurrence of byte c in  s
322       or None if c does not occur in s .
323
324
325       Since 4.05
326
327
328
329       val index_from : bytes -> int -> char -> int
330
331
332       index_from s i c returns the index of the first occurrence of byte c in
333       s after position i .  Bytes.index s c is equivalent to Bytes.index_from
334       s 0 c .
335
336
337       Raises Invalid_argument if i is not a valid position in s .
338
339
340       Raises Not_found if c does not occur in s after position i .
341
342
343
344       val index_from_opt : bytes -> int -> char -> int option
345
346
347       index_from_opt  s i c returns the index of the first occurrence of byte
348       c in s after position i or None if c does not occur in s after position
349       i .  Bytes.index_opt s c is equivalent to Bytes.index_from_opt s 0 c .
350
351
352       Since 4.05
353
354
355       Raises Invalid_argument if i is not a valid position in s .
356
357
358
359       val rindex_from : bytes -> int -> char -> int
360
361
362       rindex_from s i c returns the index of the last occurrence of byte c in
363       s before position i+1 .  rindex s c  is  equivalent  to  rindex_from  s
364       (Bytes.length s - 1) c .
365
366
367       Raises Invalid_argument if i+1 is not a valid position in s .
368
369
370       Raises Not_found if c does not occur in s before position i+1 .
371
372
373
374       val rindex_from_opt : bytes -> int -> char -> int option
375
376
377       rindex_from_opt  s i c returns the index of the last occurrence of byte
378       c in s before position i+1 or None if c does not occur in s before  po‐
379       sition   i+1   .   rindex_opt  s  c  is  equivalent  to  rindex_from  s
380       (Bytes.length s - 1) c .
381
382
383       Since 4.05
384
385
386       Raises Invalid_argument if i+1 is not a valid position in s .
387
388
389
390       val contains : bytes -> char -> bool
391
392
393       contains s c tests if byte c appears in s .
394
395
396
397       val contains_from : bytes -> int -> char -> bool
398
399
400       contains_from s start c tests if byte c appears  in  s  after  position
401       start .  contains s c is equivalent to contains_from
402           s 0 c .
403
404
405       Raises Invalid_argument if start is not a valid position in s .
406
407
408
409       val rcontains_from : bytes -> int -> char -> bool
410
411
412       rcontains_from  s  stop  c tests if byte c appears in s before position
413       stop+1 .
414
415
416       Raises Invalid_argument if stop < 0 or stop+1 is not a  valid  position
417       in s .
418
419
420
421       val uppercase : bytes -> bytes
422
423       Deprecated.   Functions  operating  on Latin-1 character set are depre‐
424       cated.
425
426
427       Return a copy of the argument, with all lowercase letters translated to
428       uppercase, including accented letters of the ISO Latin-1 (8859-1) char‐
429       acter set.
430
431
432
433       val lowercase : bytes -> bytes
434
435       Deprecated.  Functions operating on Latin-1 character  set  are  depre‐
436       cated.
437
438
439       Return a copy of the argument, with all uppercase letters translated to
440       lowercase, including accented letters of the ISO Latin-1 (8859-1) char‐
441       acter set.
442
443
444
445       val capitalize : bytes -> bytes
446
447       Deprecated.   Functions  operating  on Latin-1 character set are depre‐
448       cated.
449
450
451       Return a copy of the argument, with the first character set  to  upper‐
452       case, using the ISO Latin-1 (8859-1) character set..
453
454
455
456       val uncapitalize : bytes -> bytes
457
458       Deprecated.   Functions  operating  on Latin-1 character set are depre‐
459       cated.
460
461
462       Return a copy of the argument, with the first character set  to  lower‐
463       case, using the ISO Latin-1 (8859-1) character set..
464
465
466
467       val uppercase_ascii : bytes -> bytes
468
469       Return a copy of the argument, with all lowercase letters translated to
470       uppercase, using the US-ASCII character set.
471
472
473       Since 4.03.0
474
475
476
477       val lowercase_ascii : bytes -> bytes
478
479       Return a copy of the argument, with all uppercase letters translated to
480       lowercase, using the US-ASCII character set.
481
482
483       Since 4.03.0
484
485
486
487       val capitalize_ascii : bytes -> bytes
488
489       Return  a  copy of the argument, with the first character set to upper‐
490       case, using the US-ASCII character set.
491
492
493       Since 4.03.0
494
495
496
497       val uncapitalize_ascii : bytes -> bytes
498
499       Return a copy of the argument, with the first character set  to  lower‐
500       case, using the US-ASCII character set.
501
502
503       Since 4.03.0
504
505
506       type t = bytes
507
508
509       An alias for the type of byte sequences.
510
511
512
513       val compare : t -> t -> int
514
515       The comparison function for byte sequences, with the same specification
516       as compare .  Along with the type t , this function compare allows  the
517       module  Bytes  to  be  passed  as argument to the functors Set.Make and
518       Map.Make .
519
520
521
522       val equal : t -> t -> bool
523
524       The equality function for byte sequences.
525
526
527       Since 4.03.0
528
529
530
531
532   Unsafe conversions (for advanced users)
533       This section describes unsafe, low-level conversion  functions  between
534       bytes and string . They do not copy the internal data; used improperly,
535       they can break the immutability invariant on strings  provided  by  the
536       -safe-string option. They are available for expert library authors, but
537       for most purposes you should use the always-correct Bytes.to_string and
538       Bytes.of_string instead.
539
540       val unsafe_to_string : bytes -> string
541
542       Unsafely convert a byte sequence into a string.
543
544       To  reason about the use of unsafe_to_string , it is convenient to con‐
545       sider an "ownership" discipline. A piece of code that manipulates  some
546       data "owns" it; there are several disjoint ownership modes, including:
547
548       -Unique ownership: the data may be accessed and mutated
549
550       -Shared  ownership:  the  data has several owners, that may only access
551       it, not mutate it.
552
553       Unique ownership is linear: passing the data to another piece  of  code
554       means  giving  up  ownership (we cannot write the data again). A unique
555       owner may decide to make the data shared (giving up mutation rights  on
556       it), but shared data may not become uniquely-owned again.
557
558
559       unsafe_to_string  s  can only be used when the caller owns the byte se‐
560       quence s -- either uniquely or as shared  immutable  data.  The  caller
561       gives up ownership of s , and gains ownership of the returned string.
562
563       There are two valid use-cases that respect this ownership discipline:
564
565       1.  Creating a string by initializing and mutating a byte sequence that
566       is never changed after initialization is performed.
567
568
569       let string_init len f : string =
570         let s = Bytes.create len in
571         for i = 0 to len - 1 do Bytes.set s i (f i) done;
572         Bytes.unsafe_to_string s
573
574
575       This function is safe because the byte sequence s  will  never  be  ac‐
576       cessed  or  mutated  after  unsafe_to_string is called. The string_init
577       code gives up ownership of s , and returns the ownership of the result‐
578       ing string to its caller.
579
580       Note that it would be unsafe if s was passed as an additional parameter
581       to the function f as it could escape this way and be mutated in the fu‐
582       ture  -- string_init would give up ownership of s to pass it to f , and
583       could not call unsafe_to_string safely.
584
585       We have provided the String.init , String.map and String.mapi functions
586       to  cover  most  cases of building new strings. You should prefer those
587       over to_string or unsafe_to_string whenever applicable.
588
589       2. Temporarily giving ownership of a byte sequence to a  function  that
590       expects  a uniquely owned string and returns ownership back, so that we
591       can mutate the sequence again after the call ended.
592
593
594       let bytes_length (s : bytes) =
595         String.length (Bytes.unsafe_to_string s)
596
597
598       In this use-case, we do not promise that s will never be mutated  after
599       the  call  to  bytes_length  s . The String.length function temporarily
600       borrows unique ownership of the byte sequence (and sees it as a  string
601       ), but returns this ownership back to the caller, which may assume that
602       s is still a valid byte sequence after the call. Note that this is only
603       correct  because  we know that String.length does not capture its argu‐
604       ment -- it could escape by a side-channel such as a memoization  combi‐
605       nator.
606
607       The caller may not mutate s while the string is borrowed (it has tempo‐
608       rarily given up ownership). This affects concurrent programs, but  also
609       higher-order  functions:  if  String.length  returned  a  closure to be
610       called later, s should not be mutated until this closure is  fully  ap‐
611       plied and returns ownership.
612
613
614
615       val unsafe_of_string : string -> bytes
616
617       Unsafely  convert a shared string to a byte sequence that should not be
618       mutated.
619
620       The same ownership discipline that makes unsafe_to_string  correct  ap‐
621       plies to unsafe_of_string : you may use it if you were the owner of the
622       string value, and you will own the return bytes in the same mode.
623
624       In practice, unique ownership of string values is  extremely  difficult
625       to reason about correctly. You should always assume strings are shared,
626       never uniquely owned.
627
628       For example, string literals are implicitly shared by the compiler,  so
629       you never uniquely own them.
630
631
632       let incorrect = Bytes.unsafe_of_string "hello"
633       let s = Bytes.of_string "hello"
634
635
636       The  first declaration is incorrect, because the string literal "hello"
637       could be shared by the compiler with other parts of  the  program,  and
638       mutating  incorrect  is  a bug. You must always use the second version,
639       which performs a copy and is thus correct.
640
641       Assuming unique ownership of strings that are not string literals,  but
642       are  (partly)  built from string literals, is also incorrect. For exam‐
643       ple, mutating unsafe_of_string ("foo" ^  s)  could  mutate  the  shared
644       string  "foo"  --  assuming a rope-like representation of strings. More
645       generally, functions operating on strings will assume shared ownership,
646       they  do  not preserve unique ownership. It is thus incorrect to assume
647       unique ownership of the result of unsafe_of_string .
648
649       The only case we have reasonable confidence is safe is if the  produced
650       bytes is shared -- used as an immutable byte sequence. This is possibly
651       useful for incremental migration of low-level programs that  manipulate
652       immutable sequences of bytes (for example Marshal.from_bytes ) and pre‐
653       viously used the string type for this purpose.
654
655
656
657
658   Iterators
659       val to_seq : t -> char Seq.t
660
661       Iterate on the string, in increasing index order. Modifications of  the
662       string during iteration will be reflected in the iterator.
663
664
665       Since 4.07
666
667
668
669       val to_seqi : t -> (int * char) Seq.t
670
671       Iterate  on  the  string,  in  increasing order, yielding indices along
672       chars
673
674
675       Since 4.07
676
677
678
679       val of_seq : char Seq.t -> t
680
681       Create a string from the generator
682
683
684       Since 4.07
685
686
687
688
689   Binary encoding/decoding of integers
690       The functions in this section binary encode and decode integers to  and
691       from byte sequences.
692
693       All  following  functions raise Invalid_argument if the space needed at
694       index i to decode or encode the integer is not available.
695
696       Little-endian (resp. big-endian) encoding means that least (resp. most)
697       significant  bytes  are stored first.  Big-endian is also known as net‐
698       work byte order.  Native-endian encoding  is  either  little-endian  or
699       big-endian depending on Sys.big_endian .
700
701       32-bit  and  64-bit  integers  are  represented  by the int32 and int64
702       types, which can be interpreted either as signed or unsigned numbers.
703
704       8-bit and 16-bit integers are represented by the int  type,  which  has
705       more  bits  than  the binary encoding.  These extra bits are handled as
706       follows:
707
708       -Functions that decode signed (resp. unsigned) 8-bit or 16-bit integers
709       represented by int values sign-extend (resp. zero-extend) their result.
710
711       -Functions that encode 8-bit or 16-bit integers represented by int val‐
712       ues truncate their input to their least significant bytes.
713
714
715       val get_uint8 : bytes -> int -> int
716
717
718       get_uint8 b i is b 's unsigned 8-bit integer starting at byte index i .
719
720
721       Since 4.08
722
723
724
725       val get_int8 : bytes -> int -> int
726
727
728       get_int8 b i is b 's signed 8-bit integer starting at byte index i .
729
730
731       Since 4.08
732
733
734
735       val get_uint16_ne : bytes -> int -> int
736
737
738       get_uint16_ne b i is b 's native-endian unsigned 16-bit integer  start‐
739       ing at byte index i .
740
741
742       Since 4.08
743
744
745
746       val get_uint16_be : bytes -> int -> int
747
748
749       get_uint16_be  b  i is b 's big-endian unsigned 16-bit integer starting
750       at byte index i .
751
752
753       Since 4.08
754
755
756
757       val get_uint16_le : bytes -> int -> int
758
759
760       get_uint16_le b i is b 's little-endian unsigned 16-bit integer  start‐
761       ing at byte index i .
762
763
764       Since 4.08
765
766
767
768       val get_int16_ne : bytes -> int -> int
769
770
771       get_int16_ne  b  i is b 's native-endian signed 16-bit integer starting
772       at byte index i .
773
774
775       Since 4.08
776
777
778
779       val get_int16_be : bytes -> int -> int
780
781
782       get_int16_be b i is b 's big-endian signed 16-bit integer  starting  at
783       byte index i .
784
785
786       Since 4.08
787
788
789
790       val get_int16_le : bytes -> int -> int
791
792
793       get_int16_le  b  i is b 's little-endian signed 16-bit integer starting
794       at byte index i .
795
796
797       Since 4.08
798
799
800
801       val get_int32_ne : bytes -> int -> int32
802
803
804       get_int32_ne b i is b 's native-endian 32-bit integer starting at  byte
805       index i .
806
807
808       Since 4.08
809
810
811
812       val get_int32_be : bytes -> int -> int32
813
814
815       get_int32_be b i is b 's big-endian 32-bit integer starting at byte in‐
816       dex i .
817
818
819       Since 4.08
820
821
822
823       val get_int32_le : bytes -> int -> int32
824
825
826       get_int32_le b i is b 's little-endian 32-bit integer starting at  byte
827       index i .
828
829
830       Since 4.08
831
832
833
834       val get_int64_ne : bytes -> int -> int64
835
836
837       get_int64_ne  b i is b 's native-endian 64-bit integer starting at byte
838       index i .
839
840
841       Since 4.08
842
843
844
845       val get_int64_be : bytes -> int -> int64
846
847
848       get_int64_be b i is b 's big-endian 64-bit integer starting at byte in‐
849       dex i .
850
851
852       Since 4.08
853
854
855
856       val get_int64_le : bytes -> int -> int64
857
858
859       get_int64_le  b i is b 's little-endian 64-bit integer starting at byte
860       index i .
861
862
863       Since 4.08
864
865
866
867       val set_uint8 : bytes -> int -> int -> unit
868
869
870       set_uint8 b i v sets b 's unsigned 8-bit integer starting at byte index
871       i to v .
872
873
874       Since 4.08
875
876
877
878       val set_int8 : bytes -> int -> int -> unit
879
880
881       set_int8  b i v sets b 's signed 8-bit integer starting at byte index i
882       to v .
883
884
885       Since 4.08
886
887
888
889       val set_uint16_ne : bytes -> int -> int -> unit
890
891
892       set_uint16_ne b i v sets b 's  native-endian  unsigned  16-bit  integer
893       starting at byte index i to v .
894
895
896       Since 4.08
897
898
899
900       val set_uint16_be : bytes -> int -> int -> unit
901
902
903       set_uint16_be b i v sets b 's big-endian unsigned 16-bit integer start‐
904       ing at byte index i to v .
905
906
907       Since 4.08
908
909
910
911       val set_uint16_le : bytes -> int -> int -> unit
912
913
914       set_uint16_le b i v sets b 's  little-endian  unsigned  16-bit  integer
915       starting at byte index i to v .
916
917
918       Since 4.08
919
920
921
922       val set_int16_ne : bytes -> int -> int -> unit
923
924
925       set_int16_ne b i v sets b 's native-endian signed 16-bit integer start‐
926       ing at byte index i to v .
927
928
929       Since 4.08
930
931
932
933       val set_int16_be : bytes -> int -> int -> unit
934
935
936       set_int16_be b i v sets b 's big-endian signed 16-bit integer  starting
937       at byte index i to v .
938
939
940       Since 4.08
941
942
943
944       val set_int16_le : bytes -> int -> int -> unit
945
946
947       set_int16_le b i v sets b 's little-endian signed 16-bit integer start‐
948       ing at byte index i to v .
949
950
951       Since 4.08
952
953
954
955       val set_int32_ne : bytes -> int -> int32 -> unit
956
957
958       set_int32_ne b i v sets b 's native-endian 32-bit integer  starting  at
959       byte index i to v .
960
961
962       Since 4.08
963
964
965
966       val set_int32_be : bytes -> int -> int32 -> unit
967
968
969       set_int32_be b i v sets b 's big-endian 32-bit integer starting at byte
970       index i to v .
971
972
973       Since 4.08
974
975
976
977       val set_int32_le : bytes -> int -> int32 -> unit
978
979
980       set_int32_le b i v sets b 's little-endian 32-bit integer  starting  at
981       byte index i to v .
982
983
984       Since 4.08
985
986
987
988       val set_int64_ne : bytes -> int -> int64 -> unit
989
990
991       set_int64_ne  b  i v sets b 's native-endian 64-bit integer starting at
992       byte index i to v .
993
994
995       Since 4.08
996
997
998
999       val set_int64_be : bytes -> int -> int64 -> unit
1000
1001
1002       set_int64_be b i v sets b 's big-endian 64-bit integer starting at byte
1003       index i to v .
1004
1005
1006       Since 4.08
1007
1008
1009
1010       val set_int64_le : bytes -> int -> int64 -> unit
1011
1012
1013       set_int64_le  b  i v sets b 's little-endian 64-bit integer starting at
1014       byte index i to v .
1015
1016
1017       Since 4.08
1018
1019
1020
1021
1022
1023OCamldoc                          2021-01-26                          Bytes(3)
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