forked from winlibs/libxml2
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathparserInternals.c
2151 lines (1984 loc) · 61.4 KB
/
parserInternals.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
/*
* parserInternals.c : Internal routines (and obsolete ones) needed for the
* XML and HTML parsers.
*
* See Copyright for the status of this software.
*
*/
#define IN_LIBXML
#include "libxml.h"
#if defined(WIN32) && !defined (__CYGWIN__)
#define XML_DIR_SEP '\\'
#else
#define XML_DIR_SEP '/'
#endif
#include <string.h>
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#endif
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/valid.h>
#include <libxml/entities.h>
#include <libxml/xmlerror.h>
#include <libxml/encoding.h>
#include <libxml/valid.h>
#include <libxml/xmlIO.h>
#include <libxml/uri.h>
#include <libxml/dict.h>
#include <libxml/SAX.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#include <libxml/globals.h>
#include <libxml/chvalid.h>
#include "buf.h"
#include "enc.h"
/*
* Various global defaults for parsing
*/
/**
* xmlCheckVersion:
* @version: the include version number
*
* check the compiled lib version against the include one.
* This can warn or immediately kill the application
*/
void
xmlCheckVersion(int version) {
int myversion = (int) LIBXML_VERSION;
xmlInitParser();
if ((myversion / 10000) != (version / 10000)) {
xmlGenericError(xmlGenericErrorContext,
"Fatal: program compiled against libxml %d using libxml %d\n",
(version / 10000), (myversion / 10000));
fprintf(stderr,
"Fatal: program compiled against libxml %d using libxml %d\n",
(version / 10000), (myversion / 10000));
}
if ((myversion / 100) < (version / 100)) {
xmlGenericError(xmlGenericErrorContext,
"Warning: program compiled against libxml %d using older %d\n",
(version / 100), (myversion / 100));
}
}
/************************************************************************
* *
* Some factorized error routines *
* *
************************************************************************/
/**
* xmlErrMemory:
* @ctxt: an XML parser context
* @extra: extra informations
*
* Handle a redefinition of attribute error
*/
void
xmlErrMemory(xmlParserCtxtPtr ctxt, const char *extra)
{
if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
(ctxt->instate == XML_PARSER_EOF))
return;
if (ctxt != NULL) {
ctxt->errNo = XML_ERR_NO_MEMORY;
ctxt->instate = XML_PARSER_EOF;
ctxt->disableSAX = 1;
}
if (extra)
__xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER,
XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, extra,
NULL, NULL, 0, 0,
"Memory allocation failed : %s\n", extra);
else
__xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER,
XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, NULL,
NULL, NULL, 0, 0, "Memory allocation failed\n");
}
/**
* __xmlErrEncoding:
* @ctxt: an XML parser context
* @xmlerr: the error number
* @msg: the error message
* @str1: an string info
* @str2: an string info
*
* Handle an encoding error
*/
void
__xmlErrEncoding(xmlParserCtxtPtr ctxt, xmlParserErrors xmlerr,
const char *msg, const xmlChar * str1, const xmlChar * str2)
{
if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
(ctxt->instate == XML_PARSER_EOF))
return;
if (ctxt != NULL)
ctxt->errNo = xmlerr;
__xmlRaiseError(NULL, NULL, NULL,
ctxt, NULL, XML_FROM_PARSER, xmlerr, XML_ERR_FATAL,
NULL, 0, (const char *) str1, (const char *) str2,
NULL, 0, 0, msg, str1, str2);
if (ctxt != NULL) {
ctxt->wellFormed = 0;
if (ctxt->recovery == 0)
ctxt->disableSAX = 1;
}
}
/**
* xmlErrInternal:
* @ctxt: an XML parser context
* @msg: the error message
* @str: error informations
*
* Handle an internal error
*/
static void
xmlErrInternal(xmlParserCtxtPtr ctxt, const char *msg, const xmlChar * str)
{
if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
(ctxt->instate == XML_PARSER_EOF))
return;
if (ctxt != NULL)
ctxt->errNo = XML_ERR_INTERNAL_ERROR;
__xmlRaiseError(NULL, NULL, NULL,
ctxt, NULL, XML_FROM_PARSER, XML_ERR_INTERNAL_ERROR,
XML_ERR_FATAL, NULL, 0, (const char *) str, NULL, NULL,
0, 0, msg, str);
if (ctxt != NULL) {
ctxt->wellFormed = 0;
if (ctxt->recovery == 0)
ctxt->disableSAX = 1;
}
}
/**
* xmlErrEncodingInt:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @val: an integer value
*
* n encoding error
*/
static void
xmlErrEncodingInt(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, int val)
{
if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
(ctxt->instate == XML_PARSER_EOF))
return;
if (ctxt != NULL)
ctxt->errNo = error;
__xmlRaiseError(NULL, NULL, NULL,
ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
NULL, 0, NULL, NULL, NULL, val, 0, msg, val);
if (ctxt != NULL) {
ctxt->wellFormed = 0;
if (ctxt->recovery == 0)
ctxt->disableSAX = 1;
}
}
/**
* xmlIsLetter:
* @c: an unicode character (int)
*
* Check whether the character is allowed by the production
* [84] Letter ::= BaseChar | Ideographic
*
* Returns 0 if not, non-zero otherwise
*/
int
xmlIsLetter(int c) {
return(IS_BASECHAR(c) || IS_IDEOGRAPHIC(c));
}
/************************************************************************
* *
* Input handling functions for progressive parsing *
* *
************************************************************************/
/* #define DEBUG_INPUT */
/* #define DEBUG_STACK */
/* #define DEBUG_PUSH */
/* we need to keep enough input to show errors in context */
#define LINE_LEN 80
#ifdef DEBUG_INPUT
#define CHECK_BUFFER(in) check_buffer(in)
static
void check_buffer(xmlParserInputPtr in) {
if (in->base != xmlBufContent(in->buf->buffer)) {
xmlGenericError(xmlGenericErrorContext,
"xmlParserInput: base mismatch problem\n");
}
if (in->cur < in->base) {
xmlGenericError(xmlGenericErrorContext,
"xmlParserInput: cur < base problem\n");
}
if (in->cur > in->base + xmlBufUse(in->buf->buffer)) {
xmlGenericError(xmlGenericErrorContext,
"xmlParserInput: cur > base + use problem\n");
}
xmlGenericError(xmlGenericErrorContext,"buffer %x : content %x, cur %d, use %d\n",
(int) in, (int) xmlBufContent(in->buf->buffer), in->cur - in->base,
xmlBufUse(in->buf->buffer));
}
#else
#define CHECK_BUFFER(in)
#endif
/**
* xmlParserInputRead:
* @in: an XML parser input
* @len: an indicative size for the lookahead
*
* This function was internal and is deprecated.
*
* Returns -1 as this is an error to use it.
*/
int
xmlParserInputRead(xmlParserInputPtr in ATTRIBUTE_UNUSED, int len ATTRIBUTE_UNUSED) {
return(-1);
}
/**
* xmlParserInputGrow:
* @in: an XML parser input
* @len: an indicative size for the lookahead
*
* This function increase the input for the parser. It tries to
* preserve pointers to the input buffer, and keep already read data
*
* Returns the amount of char read, or -1 in case of error, 0 indicate the
* end of this entity
*/
int
xmlParserInputGrow(xmlParserInputPtr in, int len) {
size_t ret;
size_t indx;
const xmlChar *content;
if ((in == NULL) || (len < 0)) return(-1);
#ifdef DEBUG_INPUT
xmlGenericError(xmlGenericErrorContext, "Grow\n");
#endif
if (in->buf == NULL) return(-1);
if (in->base == NULL) return(-1);
if (in->cur == NULL) return(-1);
if (in->buf->buffer == NULL) return(-1);
CHECK_BUFFER(in);
indx = in->cur - in->base;
if (xmlBufUse(in->buf->buffer) > (unsigned int) indx + INPUT_CHUNK) {
CHECK_BUFFER(in);
return(0);
}
if (in->buf->readcallback != NULL) {
ret = xmlParserInputBufferGrow(in->buf, len);
} else
return(0);
/*
* NOTE : in->base may be a "dangling" i.e. freed pointer in this
* block, but we use it really as an integer to do some
* pointer arithmetic. Insure will raise it as a bug but in
* that specific case, that's not !
*/
content = xmlBufContent(in->buf->buffer);
if (in->base != content) {
/*
* the buffer has been reallocated
*/
indx = in->cur - in->base;
in->base = content;
in->cur = &content[indx];
}
in->end = xmlBufEnd(in->buf->buffer);
CHECK_BUFFER(in);
return(ret);
}
/**
* xmlParserInputShrink:
* @in: an XML parser input
*
* This function removes used input for the parser.
*/
void
xmlParserInputShrink(xmlParserInputPtr in) {
size_t used;
size_t ret;
size_t indx;
const xmlChar *content;
#ifdef DEBUG_INPUT
xmlGenericError(xmlGenericErrorContext, "Shrink\n");
#endif
if (in == NULL) return;
if (in->buf == NULL) return;
if (in->base == NULL) return;
if (in->cur == NULL) return;
if (in->buf->buffer == NULL) return;
CHECK_BUFFER(in);
used = in->cur - xmlBufContent(in->buf->buffer);
/*
* Do not shrink on large buffers whose only a tiny fraction
* was consumed
*/
if (used > INPUT_CHUNK) {
ret = xmlBufShrink(in->buf->buffer, used - LINE_LEN);
if (ret > 0) {
in->cur -= ret;
in->consumed += ret;
}
in->end = xmlBufEnd(in->buf->buffer);
}
CHECK_BUFFER(in);
if (xmlBufUse(in->buf->buffer) > INPUT_CHUNK) {
return;
}
xmlParserInputBufferRead(in->buf, 2 * INPUT_CHUNK);
content = xmlBufContent(in->buf->buffer);
if (in->base != content) {
/*
* the buffer has been reallocated
*/
indx = in->cur - in->base;
in->base = content;
in->cur = &content[indx];
}
in->end = xmlBufEnd(in->buf->buffer);
CHECK_BUFFER(in);
}
/************************************************************************
* *
* UTF8 character input and related functions *
* *
************************************************************************/
/**
* xmlNextChar:
* @ctxt: the XML parser context
*
* Skip to the next char input char.
*/
void
xmlNextChar(xmlParserCtxtPtr ctxt)
{
if ((ctxt == NULL) || (ctxt->instate == XML_PARSER_EOF) ||
(ctxt->input == NULL))
return;
if (ctxt->charset == XML_CHAR_ENCODING_UTF8) {
if ((*ctxt->input->cur == 0) &&
(xmlParserInputGrow(ctxt->input, INPUT_CHUNK) <= 0) &&
(ctxt->instate != XML_PARSER_COMMENT)) {
/*
* If we are at the end of the current entity and
* the context allows it, we pop consumed entities
* automatically.
* the auto closing should be blocked in other cases
*/
xmlPopInput(ctxt);
} else {
const unsigned char *cur;
unsigned char c;
/*
* 2.11 End-of-Line Handling
* the literal two-character sequence "#xD#xA" or a standalone
* literal #xD, an XML processor must pass to the application
* the single character #xA.
*/
if (*(ctxt->input->cur) == '\n') {
ctxt->input->line++; ctxt->input->col = 1;
} else
ctxt->input->col++;
/*
* We are supposed to handle UTF8, check it's valid
* From rfc2044: encoding of the Unicode values on UTF-8:
*
* UCS-4 range (hex.) UTF-8 octet sequence (binary)
* 0000 0000-0000 007F 0xxxxxxx
* 0000 0080-0000 07FF 110xxxxx 10xxxxxx
* 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx
*
* Check for the 0x110000 limit too
*/
cur = ctxt->input->cur;
c = *cur;
if (c & 0x80) {
if (c == 0xC0)
goto encoding_error;
if (cur[1] == 0) {
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
cur = ctxt->input->cur;
}
if ((cur[1] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xe0) == 0xe0) {
unsigned int val;
if (cur[2] == 0) {
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
cur = ctxt->input->cur;
}
if ((cur[2] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xf0) == 0xf0) {
if (cur[3] == 0) {
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
cur = ctxt->input->cur;
}
if (((c & 0xf8) != 0xf0) ||
((cur[3] & 0xc0) != 0x80))
goto encoding_error;
/* 4-byte code */
ctxt->input->cur += 4;
val = (cur[0] & 0x7) << 18;
val |= (cur[1] & 0x3f) << 12;
val |= (cur[2] & 0x3f) << 6;
val |= cur[3] & 0x3f;
} else {
/* 3-byte code */
ctxt->input->cur += 3;
val = (cur[0] & 0xf) << 12;
val |= (cur[1] & 0x3f) << 6;
val |= cur[2] & 0x3f;
}
if (((val > 0xd7ff) && (val < 0xe000)) ||
((val > 0xfffd) && (val < 0x10000)) ||
(val >= 0x110000)) {
xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
"Char 0x%X out of allowed range\n",
val);
}
} else
/* 2-byte code */
ctxt->input->cur += 2;
} else
/* 1-byte code */
ctxt->input->cur++;
ctxt->nbChars++;
if (*ctxt->input->cur == 0)
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
}
} else {
/*
* Assume it's a fixed length encoding (1) with
* a compatible encoding for the ASCII set, since
* XML constructs only use < 128 chars
*/
if (*(ctxt->input->cur) == '\n') {
ctxt->input->line++; ctxt->input->col = 1;
} else
ctxt->input->col++;
ctxt->input->cur++;
ctxt->nbChars++;
if (*ctxt->input->cur == 0)
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
}
if ((*ctxt->input->cur == '%') && (!ctxt->html))
xmlParserHandlePEReference(ctxt);
if ((*ctxt->input->cur == 0) &&
(xmlParserInputGrow(ctxt->input, INPUT_CHUNK) <= 0))
xmlPopInput(ctxt);
return;
encoding_error:
/*
* If we detect an UTF8 error that probably mean that the
* input encoding didn't get properly advertised in the
* declaration header. Report the error and switch the encoding
* to ISO-Latin-1 (if you don't like this policy, just declare the
* encoding !)
*/
if ((ctxt == NULL) || (ctxt->input == NULL) ||
(ctxt->input->end - ctxt->input->cur < 4)) {
__xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
"Input is not proper UTF-8, indicate encoding !\n",
NULL, NULL);
} else {
char buffer[150];
snprintf(buffer, 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
ctxt->input->cur[0], ctxt->input->cur[1],
ctxt->input->cur[2], ctxt->input->cur[3]);
__xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
"Input is not proper UTF-8, indicate encoding !\n%s",
BAD_CAST buffer, NULL);
}
ctxt->charset = XML_CHAR_ENCODING_8859_1;
ctxt->input->cur++;
return;
}
/**
* xmlCurrentChar:
* @ctxt: the XML parser context
* @len: pointer to the length of the char read
*
* The current char value, if using UTF-8 this may actually span multiple
* bytes in the input buffer. Implement the end of line normalization:
* 2.11 End-of-Line Handling
* Wherever an external parsed entity or the literal entity value
* of an internal parsed entity contains either the literal two-character
* sequence "#xD#xA" or a standalone literal #xD, an XML processor
* must pass to the application the single character #xA.
* This behavior can conveniently be produced by normalizing all
* line breaks to #xA on input, before parsing.)
*
* Returns the current char value and its length
*/
int
xmlCurrentChar(xmlParserCtxtPtr ctxt, int *len) {
if ((ctxt == NULL) || (len == NULL) || (ctxt->input == NULL)) return(0);
if (ctxt->instate == XML_PARSER_EOF)
return(0);
if ((*ctxt->input->cur >= 0x20) && (*ctxt->input->cur <= 0x7F)) {
*len = 1;
return((int) *ctxt->input->cur);
}
if (ctxt->charset == XML_CHAR_ENCODING_UTF8) {
/*
* We are supposed to handle UTF8, check it's valid
* From rfc2044: encoding of the Unicode values on UTF-8:
*
* UCS-4 range (hex.) UTF-8 octet sequence (binary)
* 0000 0000-0000 007F 0xxxxxxx
* 0000 0080-0000 07FF 110xxxxx 10xxxxxx
* 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx
*
* Check for the 0x110000 limit too
*/
const unsigned char *cur = ctxt->input->cur;
unsigned char c;
unsigned int val;
c = *cur;
if (c & 0x80) {
if (((c & 0x40) == 0) || (c == 0xC0))
goto encoding_error;
if (cur[1] == 0) {
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
cur = ctxt->input->cur;
}
if ((cur[1] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xe0) == 0xe0) {
if (cur[2] == 0) {
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
cur = ctxt->input->cur;
}
if ((cur[2] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xf0) == 0xf0) {
if (cur[3] == 0) {
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
cur = ctxt->input->cur;
}
if (((c & 0xf8) != 0xf0) ||
((cur[3] & 0xc0) != 0x80))
goto encoding_error;
/* 4-byte code */
*len = 4;
val = (cur[0] & 0x7) << 18;
val |= (cur[1] & 0x3f) << 12;
val |= (cur[2] & 0x3f) << 6;
val |= cur[3] & 0x3f;
if (val < 0x10000)
goto encoding_error;
} else {
/* 3-byte code */
*len = 3;
val = (cur[0] & 0xf) << 12;
val |= (cur[1] & 0x3f) << 6;
val |= cur[2] & 0x3f;
if (val < 0x800)
goto encoding_error;
}
} else {
/* 2-byte code */
*len = 2;
val = (cur[0] & 0x1f) << 6;
val |= cur[1] & 0x3f;
if (val < 0x80)
goto encoding_error;
}
if (!IS_CHAR(val)) {
xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
"Char 0x%X out of allowed range\n", val);
}
return(val);
} else {
/* 1-byte code */
*len = 1;
if (*ctxt->input->cur == 0)
xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
if ((*ctxt->input->cur == 0) &&
(ctxt->input->end > ctxt->input->cur)) {
xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
"Char 0x0 out of allowed range\n", 0);
}
if (*ctxt->input->cur == 0xD) {
if (ctxt->input->cur[1] == 0xA) {
ctxt->nbChars++;
ctxt->input->cur++;
}
return(0xA);
}
return((int) *ctxt->input->cur);
}
}
/*
* Assume it's a fixed length encoding (1) with
* a compatible encoding for the ASCII set, since
* XML constructs only use < 128 chars
*/
*len = 1;
if (*ctxt->input->cur == 0xD) {
if (ctxt->input->cur[1] == 0xA) {
ctxt->nbChars++;
ctxt->input->cur++;
}
return(0xA);
}
return((int) *ctxt->input->cur);
encoding_error:
/*
* An encoding problem may arise from a truncated input buffer
* splitting a character in the middle. In that case do not raise
* an error but return 0 to endicate an end of stream problem
*/
if (ctxt->input->end - ctxt->input->cur < 4) {
*len = 0;
return(0);
}
/*
* If we detect an UTF8 error that probably mean that the
* input encoding didn't get properly advertised in the
* declaration header. Report the error and switch the encoding
* to ISO-Latin-1 (if you don't like this policy, just declare the
* encoding !)
*/
{
char buffer[150];
snprintf(&buffer[0], 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
ctxt->input->cur[0], ctxt->input->cur[1],
ctxt->input->cur[2], ctxt->input->cur[3]);
__xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
"Input is not proper UTF-8, indicate encoding !\n%s",
BAD_CAST buffer, NULL);
}
ctxt->charset = XML_CHAR_ENCODING_8859_1;
*len = 1;
return((int) *ctxt->input->cur);
}
/**
* xmlStringCurrentChar:
* @ctxt: the XML parser context
* @cur: pointer to the beginning of the char
* @len: pointer to the length of the char read
*
* The current char value, if using UTF-8 this may actually span multiple
* bytes in the input buffer.
*
* Returns the current char value and its length
*/
int
xmlStringCurrentChar(xmlParserCtxtPtr ctxt, const xmlChar * cur, int *len)
{
if ((len == NULL) || (cur == NULL)) return(0);
if ((ctxt == NULL) || (ctxt->charset == XML_CHAR_ENCODING_UTF8)) {
/*
* We are supposed to handle UTF8, check it's valid
* From rfc2044: encoding of the Unicode values on UTF-8:
*
* UCS-4 range (hex.) UTF-8 octet sequence (binary)
* 0000 0000-0000 007F 0xxxxxxx
* 0000 0080-0000 07FF 110xxxxx 10xxxxxx
* 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx
*
* Check for the 0x110000 limit too
*/
unsigned char c;
unsigned int val;
c = *cur;
if (c & 0x80) {
if ((cur[1] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xe0) == 0xe0) {
if ((cur[2] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xf0) == 0xf0) {
if (((c & 0xf8) != 0xf0) || ((cur[3] & 0xc0) != 0x80))
goto encoding_error;
/* 4-byte code */
*len = 4;
val = (cur[0] & 0x7) << 18;
val |= (cur[1] & 0x3f) << 12;
val |= (cur[2] & 0x3f) << 6;
val |= cur[3] & 0x3f;
} else {
/* 3-byte code */
*len = 3;
val = (cur[0] & 0xf) << 12;
val |= (cur[1] & 0x3f) << 6;
val |= cur[2] & 0x3f;
}
} else {
/* 2-byte code */
*len = 2;
val = (cur[0] & 0x1f) << 6;
val |= cur[1] & 0x3f;
}
if (!IS_CHAR(val)) {
xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
"Char 0x%X out of allowed range\n", val);
}
return (val);
} else {
/* 1-byte code */
*len = 1;
return ((int) *cur);
}
}
/*
* Assume it's a fixed length encoding (1) with
* a compatible encoding for the ASCII set, since
* XML constructs only use < 128 chars
*/
*len = 1;
return ((int) *cur);
encoding_error:
/*
* An encoding problem may arise from a truncated input buffer
* splitting a character in the middle. In that case do not raise
* an error but return 0 to endicate an end of stream problem
*/
if ((ctxt == NULL) || (ctxt->input == NULL) ||
(ctxt->input->end - ctxt->input->cur < 4)) {
*len = 0;
return(0);
}
/*
* If we detect an UTF8 error that probably mean that the
* input encoding didn't get properly advertised in the
* declaration header. Report the error and switch the encoding
* to ISO-Latin-1 (if you don't like this policy, just declare the
* encoding !)
*/
{
char buffer[150];
snprintf(buffer, 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
ctxt->input->cur[0], ctxt->input->cur[1],
ctxt->input->cur[2], ctxt->input->cur[3]);
__xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
"Input is not proper UTF-8, indicate encoding !\n%s",
BAD_CAST buffer, NULL);
}
*len = 1;
return ((int) *cur);
}
/**
* xmlCopyCharMultiByte:
* @out: pointer to an array of xmlChar
* @val: the char value
*
* append the char value in the array
*
* Returns the number of xmlChar written
*/
int
xmlCopyCharMultiByte(xmlChar *out, int val) {
if (out == NULL) return(0);
/*
* We are supposed to handle UTF8, check it's valid
* From rfc2044: encoding of the Unicode values on UTF-8:
*
* UCS-4 range (hex.) UTF-8 octet sequence (binary)
* 0000 0000-0000 007F 0xxxxxxx
* 0000 0080-0000 07FF 110xxxxx 10xxxxxx
* 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx
*/
if (val >= 0x80) {
xmlChar *savedout = out;
int bits;
if (val < 0x800) { *out++= (val >> 6) | 0xC0; bits= 0; }
else if (val < 0x10000) { *out++= (val >> 12) | 0xE0; bits= 6;}
else if (val < 0x110000) { *out++= (val >> 18) | 0xF0; bits= 12; }
else {
xmlErrEncodingInt(NULL, XML_ERR_INVALID_CHAR,
"Internal error, xmlCopyCharMultiByte 0x%X out of bound\n",
val);
return(0);
}
for ( ; bits >= 0; bits-= 6)
*out++= ((val >> bits) & 0x3F) | 0x80 ;
return (out - savedout);
}
*out = (xmlChar) val;
return 1;
}
/**
* xmlCopyChar:
* @len: Ignored, compatibility
* @out: pointer to an array of xmlChar
* @val: the char value
*
* append the char value in the array
*
* Returns the number of xmlChar written
*/
int
xmlCopyChar(int len ATTRIBUTE_UNUSED, xmlChar *out, int val) {
if (out == NULL) return(0);
/* the len parameter is ignored */
if (val >= 0x80) {
return(xmlCopyCharMultiByte (out, val));
}
*out = (xmlChar) val;
return 1;
}
/************************************************************************
* *
* Commodity functions to switch encodings *
* *
************************************************************************/
static int
xmlSwitchToEncodingInt(xmlParserCtxtPtr ctxt,
xmlCharEncodingHandlerPtr handler, int len);
static int
xmlSwitchInputEncodingInt(xmlParserCtxtPtr ctxt, xmlParserInputPtr input,
xmlCharEncodingHandlerPtr handler, int len);
/**
* xmlSwitchEncoding:
* @ctxt: the parser context
* @enc: the encoding value (number)
*
* change the input functions when discovering the character encoding
* of a given entity.
*
* Returns 0 in case of success, -1 otherwise
*/
int
xmlSwitchEncoding(xmlParserCtxtPtr ctxt, xmlCharEncoding enc)
{
xmlCharEncodingHandlerPtr handler;
int len = -1;
int ret;
if (ctxt == NULL) return(-1);
switch (enc) {
case XML_CHAR_ENCODING_ERROR:
__xmlErrEncoding(ctxt, XML_ERR_UNKNOWN_ENCODING,
"encoding unknown\n", NULL, NULL);
return(-1);
case XML_CHAR_ENCODING_NONE:
/* let's assume it's UTF-8 without the XML decl */
ctxt->charset = XML_CHAR_ENCODING_UTF8;
return(0);
case XML_CHAR_ENCODING_UTF8:
/* default encoding, no conversion should be needed */
ctxt->charset = XML_CHAR_ENCODING_UTF8;
/*
* Errata on XML-1.0 June 20 2001
* Specific handling of the Byte Order Mark for
* UTF-8
*/
if ((ctxt->input != NULL) &&
(ctxt->input->cur[0] == 0xEF) &&
(ctxt->input->cur[1] == 0xBB) &&
(ctxt->input->cur[2] == 0xBF)) {
ctxt->input->cur += 3;
}
return(0);
case XML_CHAR_ENCODING_UTF16LE:
case XML_CHAR_ENCODING_UTF16BE:
/*The raw input characters are encoded
*in UTF-16. As we expect this function
*to be called after xmlCharEncInFunc, we expect
*ctxt->input->cur to contain UTF-8 encoded characters.
*So the raw UTF16 Byte Order Mark
*has also been converted into
*an UTF-8 BOM. Let's skip that BOM.
*/
if ((ctxt->input != NULL) && (ctxt->input->cur != NULL) &&
(ctxt->input->cur[0] == 0xEF) &&
(ctxt->input->cur[1] == 0xBB) &&
(ctxt->input->cur[2] == 0xBF)) {
ctxt->input->cur += 3;
}
len = 90;
break;
case XML_CHAR_ENCODING_UCS2:
len = 90;
break;
case XML_CHAR_ENCODING_UCS4BE:
case XML_CHAR_ENCODING_UCS4LE:
case XML_CHAR_ENCODING_UCS4_2143:
case XML_CHAR_ENCODING_UCS4_3412:
len = 180;
break;
case XML_CHAR_ENCODING_EBCDIC:
case XML_CHAR_ENCODING_8859_1:
case XML_CHAR_ENCODING_8859_2:
case XML_CHAR_ENCODING_8859_3:
case XML_CHAR_ENCODING_8859_4:
case XML_CHAR_ENCODING_8859_5: