forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 0
/
multibytecodec.c
2081 lines (1751 loc) · 59.1 KB
/
multibytecodec.c
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
/*
* multibytecodec.c: Common Multibyte Codec Implementation
*
* Written by Hye-Shik Chang <perky@FreeBSD.org>
*/
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "multibytecodec.h"
#include "clinic/multibytecodec.c.h"
#include <stddef.h> // offsetof()
#define MODULE_NAME "_multibytecodec"
typedef struct {
PyTypeObject *encoder_type;
PyTypeObject *decoder_type;
PyTypeObject *reader_type;
PyTypeObject *writer_type;
PyTypeObject *multibytecodec_type;
PyObject *str_write;
} module_state;
static module_state *
get_module_state(PyObject *module)
{
module_state *state = PyModule_GetState(module);
assert(state != NULL);
return state;
}
static struct PyModuleDef _multibytecodecmodule;
static module_state *
find_state_by_def(PyTypeObject *type)
{
PyObject *module = PyType_GetModuleByDef(type, &_multibytecodecmodule);
assert(module != NULL);
return get_module_state(module);
}
#define clinic_get_state() find_state_by_def(type)
/*[clinic input]
module _multibytecodec
class _multibytecodec.MultibyteCodec "MultibyteCodecObject *" "clinic_get_state()->multibytecodec_type"
class _multibytecodec.MultibyteIncrementalEncoder "MultibyteIncrementalEncoderObject *" "clinic_get_state()->encoder_type"
class _multibytecodec.MultibyteIncrementalDecoder "MultibyteIncrementalDecoderObject *" "clinic_get_state()->decoder_type"
class _multibytecodec.MultibyteStreamReader "MultibyteStreamReaderObject *" "clinic_get_state()->reader_type"
class _multibytecodec.MultibyteStreamWriter "MultibyteStreamWriterObject *" "clinic_get_state()->writer_type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=305a76dfdd24b99c]*/
#undef clinic_get_state
typedef struct {
PyObject *inobj;
Py_ssize_t inpos, inlen;
unsigned char *outbuf, *outbuf_end;
PyObject *excobj, *outobj;
} MultibyteEncodeBuffer;
typedef struct {
const unsigned char *inbuf, *inbuf_top, *inbuf_end;
PyObject *excobj;
_PyUnicodeWriter writer;
} MultibyteDecodeBuffer;
static char *incnewkwarglist[] = {"errors", NULL};
static char *streamkwarglist[] = {"stream", "errors", NULL};
static PyObject *multibytecodec_encode(const MultibyteCodec *,
MultibyteCodec_State *, PyObject *, Py_ssize_t *,
PyObject *, int);
#define MBENC_RESET MBENC_MAX<<1 /* reset after an encoding session */
static PyObject *
make_tuple(PyObject *object, Py_ssize_t len)
{
PyObject *v, *w;
if (object == NULL)
return NULL;
v = PyTuple_New(2);
if (v == NULL) {
Py_DECREF(object);
return NULL;
}
PyTuple_SET_ITEM(v, 0, object);
w = PyLong_FromSsize_t(len);
if (w == NULL) {
Py_DECREF(v);
return NULL;
}
PyTuple_SET_ITEM(v, 1, w);
return v;
}
static PyObject *
internal_error_callback(const char *errors)
{
if (errors == NULL || strcmp(errors, "strict") == 0)
return ERROR_STRICT;
else if (strcmp(errors, "ignore") == 0)
return ERROR_IGNORE;
else if (strcmp(errors, "replace") == 0)
return ERROR_REPLACE;
else
return PyUnicode_FromString(errors);
}
static PyObject *
call_error_callback(PyObject *errors, PyObject *exc)
{
PyObject *cb, *r;
const char *str;
assert(PyUnicode_Check(errors));
str = PyUnicode_AsUTF8(errors);
if (str == NULL)
return NULL;
cb = PyCodec_LookupError(str);
if (cb == NULL)
return NULL;
r = PyObject_CallOneArg(cb, exc);
Py_DECREF(cb);
return r;
}
static PyObject *
codecctx_errors_get(MultibyteStatefulCodecContext *self, void *Py_UNUSED(ignored))
{
const char *errors;
if (self->errors == ERROR_STRICT)
errors = "strict";
else if (self->errors == ERROR_IGNORE)
errors = "ignore";
else if (self->errors == ERROR_REPLACE)
errors = "replace";
else {
return Py_NewRef(self->errors);
}
return PyUnicode_FromString(errors);
}
static int
codecctx_errors_set(MultibyteStatefulCodecContext *self, PyObject *value,
void *closure)
{
PyObject *cb;
const char *str;
if (value == NULL) {
PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
return -1;
}
if (!PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError, "errors must be a string");
return -1;
}
str = PyUnicode_AsUTF8(value);
if (str == NULL)
return -1;
cb = internal_error_callback(str);
if (cb == NULL)
return -1;
ERROR_DECREF(self->errors);
self->errors = cb;
return 0;
}
/* This getset handlers list is used by all the stateful codec objects */
static PyGetSetDef codecctx_getsets[] = {
{"errors", (getter)codecctx_errors_get,
(setter)codecctx_errors_set,
PyDoc_STR("how to treat errors")},
{NULL,}
};
static int
expand_encodebuffer(MultibyteEncodeBuffer *buf, Py_ssize_t esize)
{
Py_ssize_t orgpos, orgsize, incsize;
orgpos = (Py_ssize_t)((char *)buf->outbuf -
PyBytes_AS_STRING(buf->outobj));
orgsize = PyBytes_GET_SIZE(buf->outobj);
incsize = (esize < (orgsize >> 1) ? (orgsize >> 1) | 1 : esize);
if (orgsize > PY_SSIZE_T_MAX - incsize) {
PyErr_NoMemory();
return -1;
}
if (_PyBytes_Resize(&buf->outobj, orgsize + incsize) == -1)
return -1;
buf->outbuf = (unsigned char *)PyBytes_AS_STRING(buf->outobj) +orgpos;
buf->outbuf_end = (unsigned char *)PyBytes_AS_STRING(buf->outobj)
+ PyBytes_GET_SIZE(buf->outobj);
return 0;
}
#define REQUIRE_ENCODEBUFFER(buf, s) do { \
if ((s) < 0 || (s) > (buf)->outbuf_end - (buf)->outbuf) \
if (expand_encodebuffer(buf, s) == -1) \
goto errorexit; \
} while(0)
/**
* MultibyteCodec object
*/
static int
multibytecodec_encerror(const MultibyteCodec *codec,
MultibyteCodec_State *state,
MultibyteEncodeBuffer *buf,
PyObject *errors, Py_ssize_t e)
{
PyObject *retobj = NULL, *retstr = NULL, *tobj;
Py_ssize_t retstrsize, newpos;
Py_ssize_t esize, start, end;
const char *reason;
if (e > 0) {
reason = "illegal multibyte sequence";
esize = e;
}
else {
switch (e) {
case MBERR_TOOSMALL:
REQUIRE_ENCODEBUFFER(buf, -1);
return 0; /* retry it */
case MBERR_TOOFEW:
reason = "incomplete multibyte sequence";
esize = (Py_ssize_t)buf->inpos;
break;
case MBERR_INTERNAL:
PyErr_SetString(PyExc_RuntimeError,
"internal codec error");
return -1;
default:
PyErr_SetString(PyExc_RuntimeError,
"unknown runtime error");
return -1;
}
}
if (errors == ERROR_REPLACE) {
PyObject *replchar;
Py_ssize_t r;
Py_ssize_t inpos;
int kind;
const void *data;
replchar = PyUnicode_FromOrdinal('?');
if (replchar == NULL)
goto errorexit;
kind = PyUnicode_KIND(replchar);
data = PyUnicode_DATA(replchar);
inpos = 0;
for (;;) {
Py_ssize_t outleft = (Py_ssize_t)(buf->outbuf_end - buf->outbuf);
r = codec->encode(state, codec,
kind, data, &inpos, 1,
&buf->outbuf, outleft, 0);
if (r == MBERR_TOOSMALL) {
REQUIRE_ENCODEBUFFER(buf, -1);
continue;
}
else
break;
}
Py_DECREF(replchar);
if (r != 0) {
REQUIRE_ENCODEBUFFER(buf, 1);
*buf->outbuf++ = '?';
}
}
if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {
buf->inpos += esize;
return 0;
}
start = (Py_ssize_t)buf->inpos;
end = start + esize;
/* use cached exception object if available */
if (buf->excobj == NULL) {
buf->excobj = PyObject_CallFunction(PyExc_UnicodeEncodeError,
"sOnns",
codec->encoding, buf->inobj,
start, end, reason);
if (buf->excobj == NULL)
goto errorexit;
}
else
if (PyUnicodeEncodeError_SetStart(buf->excobj, start) != 0 ||
PyUnicodeEncodeError_SetEnd(buf->excobj, end) != 0 ||
PyUnicodeEncodeError_SetReason(buf->excobj, reason) != 0)
goto errorexit;
if (errors == ERROR_STRICT) {
PyCodec_StrictErrors(buf->excobj);
goto errorexit;
}
retobj = call_error_callback(errors, buf->excobj);
if (retobj == NULL)
goto errorexit;
if (!PyTuple_Check(retobj) || PyTuple_GET_SIZE(retobj) != 2 ||
(!PyUnicode_Check((tobj = PyTuple_GET_ITEM(retobj, 0))) && !PyBytes_Check(tobj)) ||
!PyLong_Check(PyTuple_GET_ITEM(retobj, 1))) {
PyErr_SetString(PyExc_TypeError,
"encoding error handler must return "
"(str, int) tuple");
goto errorexit;
}
if (PyUnicode_Check(tobj)) {
Py_ssize_t inpos;
retstr = multibytecodec_encode(codec, state, tobj,
&inpos, ERROR_STRICT,
MBENC_FLUSH);
if (retstr == NULL)
goto errorexit;
}
else {
retstr = Py_NewRef(tobj);
}
assert(PyBytes_Check(retstr));
retstrsize = PyBytes_GET_SIZE(retstr);
if (retstrsize > 0) {
REQUIRE_ENCODEBUFFER(buf, retstrsize);
memcpy(buf->outbuf, PyBytes_AS_STRING(retstr), retstrsize);
buf->outbuf += retstrsize;
}
newpos = PyLong_AsSsize_t(PyTuple_GET_ITEM(retobj, 1));
if (newpos < 0 && !PyErr_Occurred())
newpos += (Py_ssize_t)buf->inlen;
if (newpos < 0 || newpos > buf->inlen) {
PyErr_Clear();
PyErr_Format(PyExc_IndexError,
"position %zd from error handler out of bounds",
newpos);
goto errorexit;
}
buf->inpos = newpos;
Py_DECREF(retobj);
Py_DECREF(retstr);
return 0;
errorexit:
Py_XDECREF(retobj);
Py_XDECREF(retstr);
return -1;
}
static int
multibytecodec_decerror(const MultibyteCodec *codec,
MultibyteCodec_State *state,
MultibyteDecodeBuffer *buf,
PyObject *errors, Py_ssize_t e)
{
PyObject *retobj = NULL, *retuni = NULL;
Py_ssize_t newpos;
const char *reason;
Py_ssize_t esize, start, end;
if (e > 0) {
reason = "illegal multibyte sequence";
esize = e;
}
else {
switch (e) {
case MBERR_TOOSMALL:
return 0; /* retry it */
case MBERR_TOOFEW:
reason = "incomplete multibyte sequence";
esize = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
break;
case MBERR_INTERNAL:
PyErr_SetString(PyExc_RuntimeError,
"internal codec error");
return -1;
case MBERR_EXCEPTION:
return -1;
default:
PyErr_SetString(PyExc_RuntimeError,
"unknown runtime error");
return -1;
}
}
if (errors == ERROR_REPLACE) {
if (_PyUnicodeWriter_WriteChar(&buf->writer,
Py_UNICODE_REPLACEMENT_CHARACTER) < 0)
goto errorexit;
}
if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {
buf->inbuf += esize;
return 0;
}
start = (Py_ssize_t)(buf->inbuf - buf->inbuf_top);
end = start + esize;
/* use cached exception object if available */
if (buf->excobj == NULL) {
buf->excobj = PyUnicodeDecodeError_Create(codec->encoding,
(const char *)buf->inbuf_top,
(Py_ssize_t)(buf->inbuf_end - buf->inbuf_top),
start, end, reason);
if (buf->excobj == NULL)
goto errorexit;
}
else
if (PyUnicodeDecodeError_SetStart(buf->excobj, start) ||
PyUnicodeDecodeError_SetEnd(buf->excobj, end) ||
PyUnicodeDecodeError_SetReason(buf->excobj, reason))
goto errorexit;
if (errors == ERROR_STRICT) {
PyCodec_StrictErrors(buf->excobj);
goto errorexit;
}
retobj = call_error_callback(errors, buf->excobj);
if (retobj == NULL)
goto errorexit;
if (!PyTuple_Check(retobj) || PyTuple_GET_SIZE(retobj) != 2 ||
!PyUnicode_Check((retuni = PyTuple_GET_ITEM(retobj, 0))) ||
!PyLong_Check(PyTuple_GET_ITEM(retobj, 1))) {
PyErr_SetString(PyExc_TypeError,
"decoding error handler must return "
"(str, int) tuple");
goto errorexit;
}
if (_PyUnicodeWriter_WriteStr(&buf->writer, retuni) < 0)
goto errorexit;
newpos = PyLong_AsSsize_t(PyTuple_GET_ITEM(retobj, 1));
if (newpos < 0 && !PyErr_Occurred())
newpos += (Py_ssize_t)(buf->inbuf_end - buf->inbuf_top);
if (newpos < 0 || buf->inbuf_top + newpos > buf->inbuf_end) {
PyErr_Clear();
PyErr_Format(PyExc_IndexError,
"position %zd from error handler out of bounds",
newpos);
goto errorexit;
}
buf->inbuf = buf->inbuf_top + newpos;
Py_DECREF(retobj);
return 0;
errorexit:
Py_XDECREF(retobj);
return -1;
}
static PyObject *
multibytecodec_encode(const MultibyteCodec *codec,
MultibyteCodec_State *state,
PyObject *text, Py_ssize_t *inpos_t,
PyObject *errors, int flags)
{
MultibyteEncodeBuffer buf;
Py_ssize_t finalsize, r = 0;
Py_ssize_t datalen;
int kind;
const void *data;
datalen = PyUnicode_GET_LENGTH(text);
if (datalen == 0 && !(flags & MBENC_RESET))
return PyBytes_FromStringAndSize(NULL, 0);
buf.excobj = NULL;
buf.outobj = NULL;
buf.inobj = text; /* borrowed reference */
buf.inpos = 0;
buf.inlen = datalen;
kind = PyUnicode_KIND(buf.inobj);
data = PyUnicode_DATA(buf.inobj);
if (datalen > (PY_SSIZE_T_MAX - 16) / 2) {
PyErr_NoMemory();
goto errorexit;
}
buf.outobj = PyBytes_FromStringAndSize(NULL, datalen * 2 + 16);
if (buf.outobj == NULL)
goto errorexit;
buf.outbuf = (unsigned char *)PyBytes_AS_STRING(buf.outobj);
buf.outbuf_end = buf.outbuf + PyBytes_GET_SIZE(buf.outobj);
while (buf.inpos < buf.inlen) {
/* we don't reuse inleft and outleft here.
* error callbacks can relocate the cursor anywhere on buffer*/
Py_ssize_t outleft = (Py_ssize_t)(buf.outbuf_end - buf.outbuf);
r = codec->encode(state, codec,
kind, data,
&buf.inpos, buf.inlen,
&buf.outbuf, outleft, flags);
if ((r == 0) || (r == MBERR_TOOFEW && !(flags & MBENC_FLUSH)))
break;
else if (multibytecodec_encerror(codec, state, &buf, errors,r))
goto errorexit;
else if (r == MBERR_TOOFEW)
break;
}
if (codec->encreset != NULL && (flags & MBENC_RESET))
for (;;) {
Py_ssize_t outleft;
outleft = (Py_ssize_t)(buf.outbuf_end - buf.outbuf);
r = codec->encreset(state, codec, &buf.outbuf,
outleft);
if (r == 0)
break;
else if (multibytecodec_encerror(codec, state,
&buf, errors, r))
goto errorexit;
}
finalsize = (Py_ssize_t)((char *)buf.outbuf -
PyBytes_AS_STRING(buf.outobj));
if (finalsize != PyBytes_GET_SIZE(buf.outobj))
if (_PyBytes_Resize(&buf.outobj, finalsize) == -1)
goto errorexit;
if (inpos_t)
*inpos_t = buf.inpos;
Py_XDECREF(buf.excobj);
return buf.outobj;
errorexit:
Py_XDECREF(buf.excobj);
Py_XDECREF(buf.outobj);
return NULL;
}
/*[clinic input]
_multibytecodec.MultibyteCodec.encode
input: object
errors: str(accept={str, NoneType}) = None
Return an encoded string version of `input'.
'errors' may be given to set a different error handling scheme. Default is
'strict' meaning that encoding errors raise a UnicodeEncodeError. Other possible
values are 'ignore', 'replace' and 'xmlcharrefreplace' as well as any other name
registered with codecs.register_error that can handle UnicodeEncodeErrors.
[clinic start generated code]*/
static PyObject *
_multibytecodec_MultibyteCodec_encode_impl(MultibyteCodecObject *self,
PyObject *input,
const char *errors)
/*[clinic end generated code: output=7b26652045ba56a9 input=606d0e128a577bae]*/
{
MultibyteCodec_State state;
PyObject *errorcb, *r, *ucvt;
Py_ssize_t datalen;
if (PyUnicode_Check(input))
ucvt = NULL;
else {
input = ucvt = PyObject_Str(input);
if (input == NULL)
return NULL;
else if (!PyUnicode_Check(input)) {
PyErr_SetString(PyExc_TypeError,
"couldn't convert the object to unicode.");
Py_DECREF(ucvt);
return NULL;
}
}
datalen = PyUnicode_GET_LENGTH(input);
errorcb = internal_error_callback(errors);
if (errorcb == NULL) {
Py_XDECREF(ucvt);
return NULL;
}
if (self->codec->encinit != NULL &&
self->codec->encinit(&state, self->codec) != 0)
goto errorexit;
r = multibytecodec_encode(self->codec, &state,
input, NULL, errorcb,
MBENC_FLUSH | MBENC_RESET);
if (r == NULL)
goto errorexit;
ERROR_DECREF(errorcb);
Py_XDECREF(ucvt);
return make_tuple(r, datalen);
errorexit:
ERROR_DECREF(errorcb);
Py_XDECREF(ucvt);
return NULL;
}
/*[clinic input]
_multibytecodec.MultibyteCodec.decode
input: Py_buffer
errors: str(accept={str, NoneType}) = None
Decodes 'input'.
'errors' may be given to set a different error handling scheme. Default is
'strict' meaning that encoding errors raise a UnicodeDecodeError. Other possible
values are 'ignore' and 'replace' as well as any other name registered with
codecs.register_error that is able to handle UnicodeDecodeErrors."
[clinic start generated code]*/
static PyObject *
_multibytecodec_MultibyteCodec_decode_impl(MultibyteCodecObject *self,
Py_buffer *input,
const char *errors)
/*[clinic end generated code: output=ff419f65bad6cc77 input=e0c78fc7ab190def]*/
{
MultibyteCodec_State state;
MultibyteDecodeBuffer buf;
PyObject *errorcb, *res;
const char *data;
Py_ssize_t datalen;
data = input->buf;
datalen = input->len;
errorcb = internal_error_callback(errors);
if (errorcb == NULL) {
return NULL;
}
if (datalen == 0) {
ERROR_DECREF(errorcb);
return make_tuple(PyUnicode_New(0, 0), 0);
}
_PyUnicodeWriter_Init(&buf.writer);
buf.writer.min_length = datalen;
buf.excobj = NULL;
buf.inbuf = buf.inbuf_top = (unsigned char *)data;
buf.inbuf_end = buf.inbuf_top + datalen;
if (self->codec->decinit != NULL &&
self->codec->decinit(&state, self->codec) != 0)
goto errorexit;
while (buf.inbuf < buf.inbuf_end) {
Py_ssize_t inleft, r;
inleft = (Py_ssize_t)(buf.inbuf_end - buf.inbuf);
r = self->codec->decode(&state, self->codec,
&buf.inbuf, inleft, &buf.writer);
if (r == 0)
break;
else if (multibytecodec_decerror(self->codec, &state,
&buf, errorcb, r))
goto errorexit;
}
res = _PyUnicodeWriter_Finish(&buf.writer);
if (res == NULL)
goto errorexit;
Py_XDECREF(buf.excobj);
ERROR_DECREF(errorcb);
return make_tuple(res, datalen);
errorexit:
ERROR_DECREF(errorcb);
Py_XDECREF(buf.excobj);
_PyUnicodeWriter_Dealloc(&buf.writer);
return NULL;
}
static struct PyMethodDef multibytecodec_methods[] = {
_MULTIBYTECODEC_MULTIBYTECODEC_ENCODE_METHODDEF
_MULTIBYTECODEC_MULTIBYTECODEC_DECODE_METHODDEF
{NULL, NULL},
};
static int
multibytecodec_clear(MultibyteCodecObject *self)
{
Py_CLEAR(self->cjk_module);
return 0;
}
static int
multibytecodec_traverse(MultibyteCodecObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->cjk_module);
return 0;
}
static void
multibytecodec_dealloc(MultibyteCodecObject *self)
{
PyObject_GC_UnTrack(self);
PyTypeObject *tp = Py_TYPE(self);
(void)multibytecodec_clear(self);
tp->tp_free(self);
Py_DECREF(tp);
}
static PyType_Slot multibytecodec_slots[] = {
{Py_tp_dealloc, multibytecodec_dealloc},
{Py_tp_getattro, PyObject_GenericGetAttr},
{Py_tp_methods, multibytecodec_methods},
{Py_tp_traverse, multibytecodec_traverse},
{Py_tp_clear, multibytecodec_clear},
{0, NULL},
};
static PyType_Spec multibytecodec_spec = {
.name = MODULE_NAME ".MultibyteCodec",
.basicsize = sizeof(MultibyteCodecObject),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_DISALLOW_INSTANTIATION | Py_TPFLAGS_IMMUTABLETYPE),
.slots = multibytecodec_slots,
};
/**
* Utility functions for stateful codec mechanism
*/
#define STATEFUL_DCTX(o) ((MultibyteStatefulDecoderContext *)(o))
#define STATEFUL_ECTX(o) ((MultibyteStatefulEncoderContext *)(o))
static PyObject *
encoder_encode_stateful(MultibyteStatefulEncoderContext *ctx,
PyObject *unistr, int final)
{
PyObject *ucvt, *r = NULL;
PyObject *inbuf = NULL;
Py_ssize_t inpos, datalen;
PyObject *origpending = NULL;
if (PyUnicode_Check(unistr))
ucvt = NULL;
else {
unistr = ucvt = PyObject_Str(unistr);
if (unistr == NULL)
return NULL;
else if (!PyUnicode_Check(unistr)) {
PyErr_SetString(PyExc_TypeError,
"couldn't convert the object to str.");
Py_DECREF(ucvt);
return NULL;
}
}
if (ctx->pending) {
PyObject *inbuf_tmp;
origpending = Py_NewRef(ctx->pending);
inbuf_tmp = Py_NewRef(ctx->pending);
PyUnicode_Append(&inbuf_tmp, unistr);
if (inbuf_tmp == NULL)
goto errorexit;
Py_CLEAR(ctx->pending);
inbuf = inbuf_tmp;
}
else {
origpending = NULL;
inbuf = Py_NewRef(unistr);
}
inpos = 0;
datalen = PyUnicode_GET_LENGTH(inbuf);
r = multibytecodec_encode(ctx->codec, &ctx->state,
inbuf, &inpos,
ctx->errors, final ? MBENC_FLUSH | MBENC_RESET : 0);
if (r == NULL) {
/* recover the original pending buffer */
Py_XSETREF(ctx->pending, origpending);
origpending = NULL;
goto errorexit;
}
Py_XDECREF(origpending);
if (inpos < datalen) {
if (datalen - inpos > MAXENCPENDING) {
/* normal codecs can't reach here */
PyErr_SetString(PyExc_UnicodeError,
"pending buffer overflow");
goto errorexit;
}
ctx->pending = PyUnicode_Substring(inbuf, inpos, datalen);
if (ctx->pending == NULL) {
/* normal codecs can't reach here */
goto errorexit;
}
}
Py_DECREF(inbuf);
Py_XDECREF(ucvt);
return r;
errorexit:
Py_XDECREF(r);
Py_XDECREF(ucvt);
Py_XDECREF(origpending);
Py_XDECREF(inbuf);
return NULL;
}
static int
decoder_append_pending(MultibyteStatefulDecoderContext *ctx,
MultibyteDecodeBuffer *buf)
{
Py_ssize_t npendings;
npendings = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
if (npendings + ctx->pendingsize > MAXDECPENDING ||
npendings > PY_SSIZE_T_MAX - ctx->pendingsize) {
PyErr_SetString(PyExc_UnicodeError, "pending buffer overflow");
return -1;
}
memcpy(ctx->pending + ctx->pendingsize, buf->inbuf, npendings);
ctx->pendingsize += npendings;
return 0;
}
static int
decoder_prepare_buffer(MultibyteDecodeBuffer *buf, const char *data,
Py_ssize_t size)
{
buf->inbuf = buf->inbuf_top = (const unsigned char *)data;
buf->inbuf_end = buf->inbuf_top + size;
buf->writer.min_length += size;
return 0;
}
static int
decoder_feed_buffer(MultibyteStatefulDecoderContext *ctx,
MultibyteDecodeBuffer *buf)
{
while (buf->inbuf < buf->inbuf_end) {
Py_ssize_t inleft;
Py_ssize_t r;
inleft = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
r = ctx->codec->decode(&ctx->state, ctx->codec,
&buf->inbuf, inleft, &buf->writer);
if (r == 0 || r == MBERR_TOOFEW)
break;
else if (multibytecodec_decerror(ctx->codec, &ctx->state,
buf, ctx->errors, r))
return -1;
}
return 0;
}
/*[clinic input]
_multibytecodec.MultibyteIncrementalEncoder.encode
input: object
final: bool = False
[clinic start generated code]*/
static PyObject *
_multibytecodec_MultibyteIncrementalEncoder_encode_impl(MultibyteIncrementalEncoderObject *self,
PyObject *input,
int final)
/*[clinic end generated code: output=123361b6c505e2c1 input=bd5f7d40d43e99b0]*/
{
return encoder_encode_stateful(STATEFUL_ECTX(self), input, final);
}
/*[clinic input]
_multibytecodec.MultibyteIncrementalEncoder.getstate
[clinic start generated code]*/
static PyObject *
_multibytecodec_MultibyteIncrementalEncoder_getstate_impl(MultibyteIncrementalEncoderObject *self)
/*[clinic end generated code: output=9794a5ace70d7048 input=4a2a82874ffa40bb]*/
{
/* state made up of 1 byte for buffer size, up to MAXENCPENDING*4 bytes
for UTF-8 encoded buffer (each character can use up to 4
bytes), and required bytes for MultibyteCodec_State.c. A byte
array is used to avoid different compilers generating different
values for the same state, e.g. as a result of struct padding.
*/
unsigned char statebytes[1 + MAXENCPENDING*4 + sizeof(self->state.c)];
Py_ssize_t statesize;
const char *pendingbuffer = NULL;
Py_ssize_t pendingsize;
if (self->pending != NULL) {
pendingbuffer = PyUnicode_AsUTF8AndSize(self->pending, &pendingsize);
if (pendingbuffer == NULL) {
return NULL;
}
if (pendingsize > MAXENCPENDING*4) {
PyErr_SetString(PyExc_UnicodeError, "pending buffer too large");
return NULL;
}
statebytes[0] = (unsigned char)pendingsize;
memcpy(statebytes + 1, pendingbuffer, pendingsize);
statesize = 1 + pendingsize;
} else {
statebytes[0] = 0;
statesize = 1;
}
memcpy(statebytes+statesize, self->state.c,
sizeof(self->state.c));
statesize += sizeof(self->state.c);
return (PyObject *)_PyLong_FromByteArray(statebytes, statesize,
1 /* little-endian */ ,
0 /* unsigned */ );
}
/*[clinic input]
_multibytecodec.MultibyteIncrementalEncoder.setstate
state as statelong: object(type='PyLongObject *', subclass_of='&PyLong_Type')
/
[clinic start generated code]*/
static PyObject *
_multibytecodec_MultibyteIncrementalEncoder_setstate_impl(MultibyteIncrementalEncoderObject *self,
PyLongObject *statelong)
/*[clinic end generated code: output=4e5e98ac1f4039ca input=c80fb5830d4d2f76]*/
{
PyObject *pending = NULL;
unsigned char statebytes[1 + MAXENCPENDING*4 + sizeof(self->state.c)];
if (_PyLong_AsByteArray(statelong, statebytes, sizeof(statebytes),
1 /* little-endian */ ,
0 /* unsigned */ ) < 0) {
goto errorexit;
}
if (statebytes[0] > MAXENCPENDING*4) {
PyErr_SetString(PyExc_UnicodeError, "pending buffer too large");
return NULL;
}
pending = PyUnicode_DecodeUTF8((const char *)statebytes+1,
statebytes[0], "strict");
if (pending == NULL) {
goto errorexit;
}
Py_XSETREF(self->pending, pending);
memcpy(self->state.c, statebytes+1+statebytes[0],
sizeof(self->state.c));
Py_RETURN_NONE;
errorexit:
Py_XDECREF(pending);
return NULL;
}