Skip to content
Navigation Menu
{{ message }}
forked from ilanschnell/bitarray
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy path_bitarray.c
More file actions
3066 lines (2642 loc) · 83.2 KB
/
Copy path_bitarray.c
File metadata and controls
3066 lines (2642 loc) · 83.2 KB
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
/*
This file is the C part of the bitarray package. Almost all
functionality is implemented here.
Author: Ilan Schnell
*/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#if PY_MAJOR_VERSION >= 3
#define IS_PY3K
#endif
#ifdef IS_PY3K
#include "bytesobject.h"
#define PyString_FromStringAndSize PyBytes_FromStringAndSize
#define PyString_FromString PyBytes_FromString
#define PyString_Check PyBytes_Check
#define PyString_Size PyBytes_Size
#define PyString_AsString PyBytes_AsString
#define PyString_ConcatAndDel PyBytes_ConcatAndDel
#define Py_TPFLAGS_HAVE_WEAKREFS 0
#endif
#if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
/* Py_ssize_t was introduced in Python 2.5, substitute long for it */
typedef long Py_ssize_t;
#define PY_SSIZE_T_MAX LONG_MAX
#define PY_SSIZE_T_MIN LONG_MIN
Py_ssize_t PyNumber_AsSsize_t(PyObject *o, PyObject *exc)
{
return PyLong_AsLong(o);
}
int PyIndex_Check(PyObject *o)
{
return 0;
}
#define PY_SSIZE_T_FMT "l"
#else
/* Python 2.5 and up uses 'n' as the format char for Py_ssize_t */
#define PY_SSIZE_T_FMT "n"
#endif
#if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 6
/* backward compatibility with Python 2.5 */
#define Py_TYPE(ob) (((PyObject *) (ob))->ob_type)
#define Py_SIZE(ob) (((PyVarObject *) (ob))->ob_size)
#endif
#if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION == 7
/* (new) buffer protocol */
#define WITH_BUFFER
#endif
#ifdef STDC_HEADERS
#include <stddef.h>
#else /* !STDC_HEADERS */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h> /* For size_t */
#endif /* HAVE_SYS_TYPES_H */
#endif /* !STDC_HEADERS */
typedef long long int idx_t;
/* throughout: 0 = little endian 1 = big endian */
#define DEFAULT_ENDIAN 1
typedef struct {
PyObject_VAR_HEAD
#ifdef WITH_BUFFER
int ob_exports; /* how many buffer exports */
#endif
char *ob_item;
Py_ssize_t allocated; /* how many bytes allocated */
idx_t nbits; /* length og bitarray */
int endian; /* bit endianness of bitarray */
PyObject *weakreflist; /* list of weak references */
} bitarrayobject;
static PyTypeObject Bitarraytype;
#define bitarray_Check(obj) PyObject_TypeCheck(obj, &Bitarraytype)
#define BITS(bytes) (((idx_t) 8) * ((idx_t) (bytes)))
#define BYTES(bits) (((bits) == 0) ? 0 : (((bits) - 1) / 8 + 1))
#define BITMASK(endian, i) (((char) 1) << ((endian) ? (7 - (i)%8) : (i)%8))
/* ------------ low level access to bits in bitarrayobject ------------- */
#define GETBIT(self, i) \
((self)->ob_item[(i) / 8] & BITMASK((self)->endian, i) ? 1 : 0)
static void
setbit(bitarrayobject *self, idx_t i, int bit)
{
char *cp, mask;
mask = BITMASK(self->endian, i);
cp = self->ob_item + i / 8;
if (bit)
*cp |= mask;
else
*cp &= ~mask;
}
static int
check_overflow(idx_t nbits)
{
idx_t max_bits;
assert(nbits >= 0);
if (sizeof(void *) == 4) { /* 32bit machine */
max_bits = ((idx_t) 1) << 34; /* 2^34 = 16 Gbits*/
if (nbits > max_bits) {
char buff[256];
sprintf(buff, "cannot create bitarray of size %lld, "
"max size is %lld", nbits, max_bits);
PyErr_SetString(PyExc_OverflowError, buff);
return -1;
}
}
return 0;
}
static int
resize(bitarrayobject *self, idx_t nbits)
{
Py_ssize_t newsize;
size_t _new_size; /* for allocation */
if (check_overflow(nbits) < 0)
return -1;
newsize = (Py_ssize_t) BYTES(nbits);
/* Bypass realloc() when a previous overallocation is large enough
to accommodate the newsize. If the newsize is 16 smaller than the
current size, then proceed with the realloc() to shrink the list.
*/
if (self->allocated >= newsize &&
Py_SIZE(self) < newsize + 16 &&
self->ob_item != NULL)
{
Py_SIZE(self) = newsize;
self->nbits = nbits;
return 0;
}
if (newsize >= Py_SIZE(self) + 65536)
/* Don't overallocate when the size increase is very large. */
_new_size = newsize;
else
/* This over-allocates proportional to the bitarray size, making
room for additional growth. The over-allocation is mild, but is
enough to give linear-time amortized behavior over a long
sequence of appends() in the presence of a poorly-performing
system realloc().
The growth pattern is: 0, 4, 8, 16, 25, 34, 44, 54, 65, 77, ...
Note, the pattern starts out the same as for lists but then
grows at a smaller rate so that larger bitarrays only overallocate
by about 1/16th -- this is done because bitarrays are assumed
to be memory critical.
*/
_new_size = (newsize >> 4) + (Py_SIZE(self) < 8 ? 3 : 7) + newsize;
self->ob_item = PyMem_Realloc(self->ob_item, _new_size);
if (self->ob_item == NULL) {
PyErr_NoMemory();
return -1;
}
Py_SIZE(self) = newsize;
self->allocated = _new_size;
self->nbits = nbits;
return 0;
}
/* create new bitarray object without initialization of buffer */
static PyObject *
newbitarrayobject(PyTypeObject *type, idx_t nbits, int endian)
{
bitarrayobject *obj;
Py_ssize_t nbytes;
if (check_overflow(nbits) < 0)
return NULL;
obj = (bitarrayobject *) type->tp_alloc(type, 0);
if (obj == NULL)
return NULL;
nbytes = (Py_ssize_t) BYTES(nbits);
Py_SIZE(obj) = nbytes;
obj->nbits = nbits;
obj->endian = endian;
if (nbytes == 0) {
obj->ob_item = NULL;
}
else {
obj->ob_item = PyMem_Malloc((size_t) nbytes);
if (obj->ob_item == NULL) {
PyObject_Del(obj);
PyErr_NoMemory();
return NULL;
}
}
obj->allocated = nbytes;
obj->weakreflist = NULL;
return (PyObject *) obj;
}
static void
bitarray_dealloc(bitarrayobject *self)
{
if (self->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) self);
if (self->ob_item != NULL)
PyMem_Free((void *) self->ob_item);
Py_TYPE(self)->tp_free((PyObject *) self);
}
/* copy n bits from other (starting at b) onto self (starting at a) */
static void
copy_n(bitarrayobject *self, idx_t a,
bitarrayobject *other, idx_t b, idx_t n)
{
idx_t i;
assert(0 <= n && n <= self->nbits && n <= other->nbits);
assert(0 <= a && a <= self->nbits - n);
assert(0 <= b && b <= other->nbits - n);
if (n == 0) {
return;
}
if (self->endian == other->endian && a % 8 == 0 && b % 8 == 0 && n >= 8)
{
const Py_ssize_t bytes = (Py_ssize_t) n / 8;
const idx_t bits = bytes * 8;
if (a <= b) {
memmove(self->ob_item + a / 8, other->ob_item + b / 8, bytes);
}
if (n != bits) {
copy_n(self, bits + a, other, bits + b, n - bits);
}
if (a > b) {
memmove(self->ob_item + a / 8, other->ob_item + b / 8, bytes);
}
return;
}
/* the different type of looping is only relevant when other and self
are the same object, i.e. when copying a piece of an bitarrayobject
onto itself */
if (a <= b) {
for (i = 0; i < n; i++) /* loop forward (delete) */
setbit(self, i + a, GETBIT(other, i + b));
}
else {
for (i = n - 1; i >= 0; i--) /* loop backwards (insert) */
setbit(self, i + a, GETBIT(other, i + b));
}
}
/* starting at start, delete n bits from self */
static int
delete_n(bitarrayobject *self, idx_t start, idx_t n)
{
assert(0 <= start && start <= self->nbits);
assert(0 <= n && n <= self->nbits - start);
if (n == 0)
return 0;
copy_n(self, start, self, start + n, self->nbits - start - n);
return resize(self, self->nbits - n);
}
/* starting at start, insert n (uninitialized) bits into self */
static int
insert_n(bitarrayobject *self, idx_t start, idx_t n)
{
assert(0 <= start && start <= self->nbits);
assert(n >= 0);
if (n == 0)
return 0;
if (resize(self, self->nbits + n) < 0)
return -1;
copy_n(self, start + n, self, start, self->nbits - start - n);
return 0;
}
/* sets ususet bits to 0, i.e. the ones in the last byte (if any),
and return the number of bits set -- self->nbits is unchanged */
static int
setunused(bitarrayobject *self)
{
idx_t i, n;
int res = 0;
n = BITS(Py_SIZE(self));
for (i = self->nbits; i < n; i++) {
setbit(self, i, 0);
res++;
}
assert(res < 8);
return res;
}
/* repeat self n times */
static int
repeat(bitarrayobject *self, idx_t n)
{
idx_t nbits, i;
if (n <= 0) {
if (resize(self, 0) < 0)
return -1;
}
if (n > 1) {
nbits = self->nbits;
if (resize(self, nbits * n) < 0)
return -1;
for (i = 1; i < n; i++)
copy_n(self, i * nbits, self, 0, nbits);
}
return 0;
}
enum op_type {
OP_and,
OP_or,
OP_xor,
};
/* perform bitwise operation */
static int
bitwise(bitarrayobject *self, PyObject *arg, enum op_type oper)
{
bitarrayobject *other;
Py_ssize_t i;
if (!bitarray_Check(arg)) {
PyErr_SetString(PyExc_TypeError,
"bitarray object expected for bitwise operation");
return -1;
}
other = (bitarrayobject *) arg;
if (self->nbits != other->nbits) {
PyErr_SetString(PyExc_ValueError,
"bitarrays of equal length expected for bitwise operation");
return -1;
}
setunused(self);
setunused(other);
switch (oper) {
case OP_and:
for (i = 0; i < Py_SIZE(self); i++)
self->ob_item[i] &= other->ob_item[i];
break;
case OP_or:
for (i = 0; i < Py_SIZE(self); i++)
self->ob_item[i] |= other->ob_item[i];
break;
case OP_xor:
for (i = 0; i < Py_SIZE(self); i++)
self->ob_item[i] ^= other->ob_item[i];
break;
}
return 0;
}
/* set the bits from start to stop (excluding) in self to val */
static void
setrange(bitarrayobject *self, idx_t start, idx_t stop, int val)
{
idx_t i;
assert(0 <= start && start <= self->nbits);
assert(0 <= stop && stop <= self->nbits);
for (i = start; i < stop; i++)
setbit(self, i, val);
}
static void
invert(bitarrayobject *self)
{
Py_ssize_t i;
for (i = 0; i < Py_SIZE(self); i++)
self->ob_item[i] = ~self->ob_item[i];
}
/* reverse the order of bits in each byte of the buffer */
static void
bytereverse(bitarrayobject *self)
{
static char trans[256];
static int setup = 0;
Py_ssize_t i;
unsigned char c;
if (!setup) {
/* setup translation table, which maps each byte to it's reversed:
trans = {0, 128, 64, 192, 32, 160, ..., 255} */
int j, k;
for (k = 0; k < 256; k++) {
trans[k] = 0x00;
for (j = 0; j < 8; j++)
if (1 << (7 - j) & k)
trans[k] |= 1 << j;
}
setup = 1;
}
setunused(self);
for (i = 0; i < Py_SIZE(self); i++) {
c = self->ob_item[i];
self->ob_item[i] = trans[c];
}
}
static int bitcount_lookup[256] = {
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8,
};
/* returns number of 1 bits */
static idx_t
count(bitarrayobject *self)
{
Py_ssize_t i;
idx_t res = 0;
unsigned char c;
setunused(self);
for (i = 0; i < Py_SIZE(self); i++) {
c = self->ob_item[i];
res += bitcount_lookup[c];
}
return res;
}
/* return index of first occurrence of vi, -1 when x is not in found. */
static idx_t
findfirst(bitarrayobject *self, int vi, idx_t start, idx_t stop)
{
Py_ssize_t j;
idx_t i;
char c;
if (Py_SIZE(self) == 0)
return -1;
if (start < 0 || start > self->nbits)
start = 0;
if (stop < 0 || stop > self->nbits)
stop = self->nbits;
if (start >= stop)
return -1;
if (stop > start + 8) {
/* seraching for 1 means: break when byte is not 0x00
searching for 0 means: break when byte is not 0xff */
c = vi ? 0x00 : 0xff;
/* skip ahead by checking whole bytes */
for (j = (Py_ssize_t) (start / 8); j < BYTES(stop); j++)
if (c ^ self->ob_item[j])
break;
if (j == Py_SIZE(self))
j--;
assert(0 <= j && j < Py_SIZE(self));
if (start < BITS(j))
start = BITS(j);
}
/* fine grained search */
for (i = start; i < stop; i++)
if (GETBIT(self, i) == vi)
return i;
return -1;
}
/* search for the first occurrence bitarray xa (in self), starting at p,
and return its position (-1 when not found)
*/
static idx_t
search(bitarrayobject *self, bitarrayobject *xa, idx_t p)
{
idx_t i;
assert(p >= 0);
while (p < self->nbits - xa->nbits + 1) {
for (i = 0; i < xa->nbits; i++)
if (GETBIT(self, p + i) != GETBIT(xa, i))
goto next;
return p;
next:
p++;
}
return -1;
}
static int
set_item(bitarrayobject *self, idx_t i, PyObject *v)
{
long vi;
assert(0 <= i && i < self->nbits);
vi = PyObject_IsTrue(v);
if (vi < 0)
return -1;
setbit(self, i, vi);
return 0;
}
static int
append_item(bitarrayobject *self, PyObject *item)
{
if (resize(self, self->nbits + 1) < 0)
return -1;
return set_item(self, self->nbits - 1, item);
}
static PyObject *
unpack(bitarrayobject *self, char zero, char one)
{
PyObject *res;
Py_ssize_t i;
char *str;
if (self->nbits > PY_SSIZE_T_MAX) {
PyErr_SetString(PyExc_OverflowError, "bitarray too large to unpack");
return NULL;
}
str = PyMem_Malloc((size_t) self->nbits);
if (str == NULL) {
PyErr_NoMemory();
return NULL;
}
for (i = 0; i < self->nbits; i++) {
*(str + i) = GETBIT(self, i) ? one : zero;
}
res = PyString_FromStringAndSize(str, (Py_ssize_t) self->nbits);
PyMem_Free((void *) str);
return res;
}
static int
extend_bitarray(bitarrayobject *self, bitarrayobject *other)
{
idx_t n_sum;
idx_t n_other_bits;
if (other->nbits == 0)
return 0;
/*
Note: other may be self. Thus we take the size before we resize,
ensuring we only copy the right parts of the array.
*/
n_other_bits = other->nbits;
n_sum = self->nbits + other->nbits;
if (resize(self, n_sum) < 0)
return -1;
copy_n(self, n_sum - n_other_bits, other, 0, n_other_bits);
return 0;
}
static int
extend_iter(bitarrayobject *self, PyObject *iter)
{
PyObject *item;
assert(PyIter_Check(iter));
while ((item = PyIter_Next(iter)) != NULL) {
if (append_item(self, item) < 0) {
Py_DECREF(item);
return -1;
}
Py_DECREF(item);
}
if (PyErr_Occurred())
return -1;
return 0;
}
static int
extend_list(bitarrayobject *self, PyObject *list)
{
PyObject *item;
Py_ssize_t n, i;
assert(PyList_Check(list));
n = PyList_Size(list);
if (n == 0)
return 0;
if (resize(self, self->nbits + n) < 0)
return -1;
for (i = 0; i < n; i++) {
item = PyList_GetItem(list, i);
if (item == NULL)
return -1;
if (set_item(self, self->nbits - n + i, item) < 0)
return -1;
}
return 0;
}
static int
extend_tuple(bitarrayobject *self, PyObject *tuple)
{
PyObject *item;
Py_ssize_t n, i;
assert(PyTuple_Check(tuple));
n = PyTuple_Size(tuple);
if (n == 0)
return 0;
if (resize(self, self->nbits + n) < 0)
return -1;
for (i = 0; i < n; i++) {
item = PyTuple_GetItem(tuple, i);
if (item == NULL)
return -1;
if (set_item(self, self->nbits - n + i, item) < 0)
return -1;
}
return 0;
}
/* extend_string(): extend the bitarray from a string, where each whole
characters is converted to a single bit
*/
enum conv_tp {
STR_01, /* '0' -> 0 '1' -> 1 no other characters allowed */
STR_RAW, /* 0x00 -> 0 other -> 1 */
};
static int
extend_string(bitarrayobject *self, PyObject *string, enum conv_tp conv)
{
Py_ssize_t strlen, i;
char c, *str;
int vi = 0;
assert(PyString_Check(string));
strlen = PyString_Size(string);
if (strlen == 0)
return 0;
if (resize(self, self->nbits + strlen) < 0)
return -1;
str = PyString_AsString(string);
for (i = 0; i < strlen; i++) {
c = *(str + i);
/* depending on conv, map c to bit */
switch (conv) {
case STR_01:
switch (c) {
case '0': vi = 0; break;
case '1': vi = 1; break;
default:
PyErr_Format(PyExc_ValueError,
"character must be '0' or '1', found '%c'", c);
return -1;
}
break;
case STR_RAW:
vi = c ? 1 : 0;
break;
}
setbit(self, self->nbits - strlen + i, vi);
}
return 0;
}
static int
extend_rawstring(bitarrayobject *self, PyObject *string)
{
Py_ssize_t strlen;
char *str;
assert(PyString_Check(string) && self->nbits % 8 == 0);
strlen = PyString_Size(string);
if (strlen == 0)
return 0;
if (resize(self, self->nbits + BITS(strlen)) < 0)
return -1;
str = PyString_AsString(string);
memcpy(self->ob_item + (Py_SIZE(self) - strlen), str, strlen);
return 0;
}
static int
extend_dispatch(bitarrayobject *self, PyObject *obj)
{
PyObject *iter;
int ret;
/* dispatch on type */
if (bitarray_Check(obj)) /* bitarray */
return extend_bitarray(self, (bitarrayobject *) obj);
if (PyList_Check(obj)) /* list */
return extend_list(self, obj);
if (PyTuple_Check(obj)) /* tuple */
return extend_tuple(self, obj);
if (PyString_Check(obj)) /* str01 */
return extend_string(self, obj, STR_01);
#ifdef IS_PY3K
if (PyUnicode_Check(obj)) { /* str01 */
PyObject *string;
string = PyUnicode_AsEncodedString(obj, NULL, NULL);
ret = extend_string(self, string, STR_01);
Py_DECREF(string);
return ret;
}
#endif
if (PyIter_Check(obj)) /* iter */
return extend_iter(self, obj);
/* finally, try to get the iterator of the object */
iter = PyObject_GetIter(obj);
if (iter == NULL) {
PyErr_SetString(PyExc_TypeError, "could not extend bitarray");
return -1;
}
ret = extend_iter(self, iter);
Py_DECREF(iter);
return ret;
}
/* --------- helper functions NOT involving bitarrayobjects ------------ */
#define ENDIAN_STR(ba) (((ba)->endian) ? "big" : "little")
#ifdef IS_PY3K
#define IS_INDEX(x) (PyLong_Check(x) || PyIndex_Check(x))
#define IS_INT_OR_BOOL(x) (PyBool_Check(x) || PyLong_Check(x))
#else
#define IS_INDEX(x) (PyInt_Check(x) || PyLong_Check(x) || PyIndex_Check(x))
#define IS_INT_OR_BOOL(x) (PyBool_Check(x) || PyInt_Check(x) || \
PyLong_Check(x))
#endif
/* given an PyLong (which must be 0 or 1), or a PyBool, return 0 or 1,
or -1 on error */
static int
IntBool_AsInt(PyObject *v)
{
long x;
if (PyBool_Check(v))
return PyObject_IsTrue(v);
#ifndef IS_PY3K
if (PyInt_Check(v)) {
x = PyInt_AsLong(v);
}
else
#endif
if (PyLong_Check(v)) {
x = PyLong_AsLong(v);
}
else {
PyErr_SetString(PyExc_TypeError, "integer or bool expected");
return -1;
}
if (x < 0 || x > 1) {
PyErr_SetString(PyExc_ValueError,
"integer value between 0 and 1 expected");
return -1;
}
return (int) x;
}
/* Extract a slice index from a PyInt or PyLong or an object with the
nb_index slot defined, and store in *i.
However, this function returns -1 on error and 0 on success.
This is almost _PyEval_SliceIndex() with Py_ssize_t replaced by idx_t
*/
static int
getIndex(PyObject *v, idx_t *i)
{
idx_t x;
#ifndef IS_PY3K
if (PyInt_Check(v)) {
x = PyInt_AS_LONG(v);
}
else
#endif
if (PyLong_Check(v)) {
x = PyLong_AsLongLong(v);
}
else if (PyIndex_Check(v)) {
x = PyNumber_AsSsize_t(v, NULL);
if (x == -1 && PyErr_Occurred())
return -1;
}
else {
PyErr_SetString(PyExc_TypeError, "slice indices must be integers or "
"None or have an __index__ method");
return -1;
}
*i = x;
return 0;
}
/* this is PySlice_GetIndicesEx() with Py_ssize_t replaced by idx_t */
static int
slice_GetIndicesEx(PySliceObject *r, idx_t length,
idx_t *start, idx_t *stop, idx_t *step, idx_t *slicelength)
{
idx_t defstart, defstop;
if (r->step == Py_None) {
*step = 1;
}
else {
if (getIndex(r->step, step) < 0)
return -1;
if (*step == 0) {
PyErr_SetString(PyExc_ValueError, "slice step cannot be zero");
return -1;
}
}
defstart = *step < 0 ? length - 1 : 0;
defstop = *step < 0 ? -1 : length;
if (r->start == Py_None) {
*start = defstart;
}
else {
if (getIndex(r->start, start) < 0)
return -1;
if (*start < 0) *start += length;
if (*start < 0) *start = (*step < 0) ? -1 : 0;
if (*start >= length) *start = (*step < 0) ? length - 1 : length;
}
if (r->stop == Py_None) {
*stop = defstop;
}
else {
if (getIndex(r->stop, stop) < 0)
return -1;
if (*stop < 0) *stop += length;
if (*stop < 0) *stop = -1;
if (*stop > length) *stop = length;
}
if ((*step < 0 && *stop >= *start) || (*step > 0 && *start >= *stop)) {
*slicelength = 0;
}
else if (*step < 0) {
*slicelength = (*stop - *start + 1) / (*step) + 1;
}
else {
*slicelength = (*stop - *start - 1) / (*step) + 1;
}
return 0;
}
/**************************************************************************
Implementation of API methods
**************************************************************************/
static PyObject *
bitarray_length(bitarrayobject *self)
{
return PyLong_FromLongLong(self->nbits);
}
PyDoc_STRVAR(length_doc,
"length() -> int\n\
\n\
Return the length, i.e. number of bits stored in the bitarray.\n\
This method is preferred over __len__ (used when typing ``len(a)``),\n\
since __len__ will fail for a bitarray object with 2^31 or more elements\n\
on a 32bit machine, whereas this method will return the correct value,\n\
on 32bit and 64bit machines.");
PyDoc_STRVAR(len_doc,
"__len__() -> int\n\
\n\
Return the length, i.e. number of bits stored in the bitarray.\n\
This method will fail for a bitarray object with 2^31 or more elements\n\
on a 32bit machine. Use bitarray.length() instead.");
static PyObject *
bitarray_copy(bitarrayobject *self)
{
PyObject *res;
res = newbitarrayobject(Py_TYPE(self), self->nbits, self->endian);
if (res == NULL)
return NULL;
memcpy(((bitarrayobject *) res)->ob_item, self->ob_item, Py_SIZE(self));
return res;
}
PyDoc_STRVAR(copy_doc,
"copy() -> bitarray\n\
\n\
Return a copy of the bitarray.");
static PyObject *
bitarray_count(bitarrayobject *self, PyObject *args)
{
idx_t n1;
long x = 1;
if (!PyArg_ParseTuple(args, "|i:count", &x))
return NULL;
n1 = count(self);
return PyLong_FromLongLong(x ? n1 : (self->nbits - n1));
}
PyDoc_STRVAR(count_doc,
"count([value]) -> int\n\
\n\
Return number of occurrences of value (defaults to True) in the bitarray.");
static PyObject *
bitarray_index(bitarrayobject *self, PyObject *args)
{
PyObject *x;
idx_t i, start = 0, stop = -1;
long vi;
if (!PyArg_ParseTuple(args, "O|LL:index", &x, &start, &stop))
return NULL;
vi = PyObject_IsTrue(x);
if (vi < 0)
return NULL;
i = findfirst(self, vi, start, stop);
if (i < 0) {
PyErr_SetString(PyExc_ValueError, "index(x): x not in bitarray");
return NULL;
}
return PyLong_FromLongLong(i);
}
PyDoc_STRVAR(index_doc,
"index(value, [start, [stop]]) -> int\n\
\n\
Return index of the first occurrence of bool(value) in the bitarray.\n\
You can’t perform that action at this time.