-
Notifications
You must be signed in to change notification settings - Fork 359
/
c14n.c
2215 lines (1977 loc) · 67.3 KB
/
c14n.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
/*
* "Canonical XML" implementation
* http://www.w3.org/TR/xml-c14n
*
* "Exclusive XML Canonicalization" implementation
* http://www.w3.org/TR/xml-exc-c14n
*
* See Copyright for the status of this software.
*
* Author: Aleksey Sanin <aleksey@aleksey.com>
*/
#define IN_LIBXML
#include "libxml.h"
#ifdef LIBXML_C14N_ENABLED
#include <stdlib.h>
#include <string.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
#include <libxml/xpathInternals.h>
#include <libxml/c14n.h>
#include "private/error.h"
#include "private/io.h"
/************************************************************************
* *
* Some declaration better left private ATM *
* *
************************************************************************/
typedef enum {
XMLC14N_BEFORE_DOCUMENT_ELEMENT = 0,
XMLC14N_INSIDE_DOCUMENT_ELEMENT = 1,
XMLC14N_AFTER_DOCUMENT_ELEMENT = 2
} xmlC14NPosition;
typedef struct _xmlC14NVisibleNsStack {
int nsCurEnd; /* number of nodes in the set */
int nsPrevStart; /* the beginning of the stack for previous visible node */
int nsPrevEnd; /* the end of the stack for previous visible node */
int nsMax; /* size of the array as allocated */
xmlNsPtr *nsTab; /* array of ns in no particular order */
xmlNodePtr *nodeTab; /* array of nodes in no particular order */
} xmlC14NVisibleNsStack, *xmlC14NVisibleNsStackPtr;
typedef struct _xmlC14NCtx {
/* input parameters */
xmlDocPtr doc;
xmlC14NIsVisibleCallback is_visible_callback;
void* user_data;
int with_comments;
xmlOutputBufferPtr buf;
/* position in the XML document */
xmlC14NPosition pos;
int parent_is_doc;
xmlC14NVisibleNsStackPtr ns_rendered;
/* C14N mode */
xmlC14NMode mode;
/* exclusive canonicalization */
xmlChar **inclusive_ns_prefixes;
/* error number */
int error;
} xmlC14NCtx, *xmlC14NCtxPtr;
static xmlC14NVisibleNsStackPtr xmlC14NVisibleNsStackCreate (void);
static void xmlC14NVisibleNsStackDestroy (xmlC14NVisibleNsStackPtr cur);
static int xmlC14NVisibleNsStackAdd (xmlC14NVisibleNsStackPtr cur,
xmlNsPtr ns,
xmlNodePtr node);
static void xmlC14NVisibleNsStackSave (xmlC14NVisibleNsStackPtr cur,
xmlC14NVisibleNsStackPtr state);
static void xmlC14NVisibleNsStackRestore (xmlC14NVisibleNsStackPtr cur,
xmlC14NVisibleNsStackPtr state);
static void xmlC14NVisibleNsStackShift (xmlC14NVisibleNsStackPtr cur);
static int xmlC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
xmlNsPtr ns);
static int xmlExcC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
xmlNsPtr ns,
xmlC14NCtxPtr ctx);
static int xmlC14NIsNodeInNodeset (void *user_data,
xmlNodePtr node,
xmlNodePtr parent);
static int xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur);
static int xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur);
typedef enum {
XMLC14N_NORMALIZE_ATTR = 0,
XMLC14N_NORMALIZE_COMMENT = 1,
XMLC14N_NORMALIZE_PI = 2,
XMLC14N_NORMALIZE_TEXT = 3
} xmlC14NNormalizationMode;
static xmlChar *xmlC11NNormalizeString(const xmlChar * input,
xmlC14NNormalizationMode mode);
#define xmlC11NNormalizeAttr( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_ATTR)
#define xmlC11NNormalizeComment( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_COMMENT)
#define xmlC11NNormalizePI( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_PI)
#define xmlC11NNormalizeText( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_TEXT)
#define xmlC14NIsVisible( ctx, node, parent ) \
(((ctx)->is_visible_callback != NULL) ? \
(ctx)->is_visible_callback((ctx)->user_data, \
(xmlNodePtr)(node), (xmlNodePtr)(parent)) : 1)
#define xmlC14NIsExclusive( ctx ) \
( (ctx)->mode == XML_C14N_EXCLUSIVE_1_0 )
/************************************************************************
* *
* Some factorized error routines *
* *
************************************************************************/
/**
* xmlC14NErrMemory:
* @extra: extra information
*
* Handle a redefinition of memory error
*/
static void
xmlC14NErrMemory(xmlC14NCtxPtr ctxt)
{
if (ctxt != NULL)
ctxt->error = XML_ERR_NO_MEMORY;
xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_C14N, NULL);
}
static void
xmlC14NErrFull(xmlC14NCtxPtr ctxt, xmlNodePtr node, int code, const char *str1,
const char *msg, ...)
{
va_list ap;
int res;
if (ctxt != NULL)
ctxt->error = code;
va_start(ap, msg);
res = xmlVRaiseError(NULL, NULL, NULL, ctxt, node,
XML_FROM_C14N, code, XML_ERR_ERROR, NULL, 0,
str1, NULL, NULL, 0, 0,
msg, ap);
va_end(ap);
if (res < 0)
xmlC14NErrMemory(ctxt);
}
/**
* xmlC14NErrParam:
* @extra: extra information
*
* Handle a param error
*/
static void
xmlC14NErrParam(xmlC14NCtxPtr ctxt)
{
xmlC14NErrFull(ctxt, NULL, XML_ERR_ARGUMENT, NULL,
"Invalid argument\n", NULL);
}
/**
* xmlC14NErrInvalidNode:
* @extra: extra information
*
* Handle an invalid node error
*/
static void
xmlC14NErrInvalidNode(xmlC14NCtxPtr ctxt, const char *node_type,
const char *extra)
{
xmlC14NErrFull(ctxt, NULL, XML_C14N_INVALID_NODE, extra,
"Node %s is invalid here : %s\n", node_type, extra);
}
/**
* xmlC14NErrUnknownNode:
* @extra: extra information
*
* Handle an unknown node error
*/
static void
xmlC14NErrUnknownNode(xmlC14NCtxPtr ctxt, int node_type, const char *extra)
{
xmlC14NErrFull(ctxt, NULL, XML_C14N_UNKNOW_NODE, extra,
"Unknown node type %d found : %s\n", node_type, extra);
}
/**
* xmlC14NErrRelativeNamespace:
* @extra: extra information
*
* Handle a relative namespace error
*/
static void
xmlC14NErrRelativeNamespace(xmlC14NCtxPtr ctxt, const char *ns_uri)
{
xmlC14NErrFull(ctxt, NULL, XML_C14N_RELATIVE_NAMESPACE, ns_uri,
"Relative namespace UR is invalid here : %s\n", ns_uri);
}
/**
* xmlC14NErr:
* @ctxt: a C14N evaluation context
* @node: the context node
* @error: the error code
* @msg: the message
* @extra: extra information
*
* Handle an error
*/
static void
xmlC14NErr(xmlC14NCtxPtr ctxt, xmlNodePtr node, int error,
const char * msg)
{
xmlC14NErrFull(ctxt, node, error, NULL, "%s", msg);
}
/************************************************************************
* *
* The implementation internals *
* *
************************************************************************/
#define XML_NAMESPACES_DEFAULT 16
static int
xmlC14NIsNodeInNodeset(void *user_data, xmlNodePtr node, xmlNodePtr parent) {
xmlNodeSetPtr nodes = (xmlNodeSetPtr) user_data;
if((nodes != NULL) && (node != NULL)) {
if(node->type != XML_NAMESPACE_DECL) {
return(xmlXPathNodeSetContains(nodes, node));
} else {
xmlNs ns;
memcpy(&ns, node, sizeof(ns));
/* this is a libxml hack! check xpath.c for details */
if((parent != NULL) && (parent->type == XML_ATTRIBUTE_NODE)) {
ns.next = (xmlNsPtr)parent->parent;
} else {
ns.next = (xmlNsPtr)parent;
}
/*
* If the input is an XPath node-set, then the node-set must explicitly
* contain every node to be rendered to the canonical form.
*/
return(xmlXPathNodeSetContains(nodes, (xmlNodePtr)&ns));
}
}
return(1);
}
static xmlC14NVisibleNsStackPtr
xmlC14NVisibleNsStackCreate(void) {
xmlC14NVisibleNsStackPtr ret;
ret = (xmlC14NVisibleNsStackPtr) xmlMalloc(sizeof(xmlC14NVisibleNsStack));
if (ret == NULL)
return(NULL);
memset(ret, 0, sizeof(xmlC14NVisibleNsStack));
return(ret);
}
static void
xmlC14NVisibleNsStackDestroy(xmlC14NVisibleNsStackPtr cur) {
if(cur == NULL) {
xmlC14NErrParam(NULL);
return;
}
if(cur->nsTab != NULL) {
memset(cur->nsTab, 0, cur->nsMax * sizeof(xmlNsPtr));
xmlFree(cur->nsTab);
}
if(cur->nodeTab != NULL) {
memset(cur->nodeTab, 0, cur->nsMax * sizeof(xmlNodePtr));
xmlFree(cur->nodeTab);
}
memset(cur, 0, sizeof(xmlC14NVisibleNsStack));
xmlFree(cur);
}
static int
xmlC14NVisibleNsStackAdd(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlNodePtr node) {
if((cur == NULL) ||
((cur->nsTab == NULL) && (cur->nodeTab != NULL)) ||
((cur->nsTab != NULL) && (cur->nodeTab == NULL)))
return (1);
if ((cur->nsTab == NULL) && (cur->nodeTab == NULL)) {
cur->nsTab = (xmlNsPtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
cur->nodeTab = (xmlNodePtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
if ((cur->nsTab == NULL) || (cur->nodeTab == NULL))
return (-1);
memset(cur->nsTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
memset(cur->nodeTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
cur->nsMax = XML_NAMESPACES_DEFAULT;
} else if(cur->nsMax == cur->nsCurEnd) {
void *tmp;
int tmpSize;
tmpSize = 2 * cur->nsMax;
tmp = xmlRealloc(cur->nsTab, tmpSize * sizeof(xmlNsPtr));
if (tmp == NULL)
return (-1);
cur->nsTab = (xmlNsPtr*)tmp;
tmp = xmlRealloc(cur->nodeTab, tmpSize * sizeof(xmlNodePtr));
if (tmp == NULL)
return (-1);
cur->nodeTab = (xmlNodePtr*)tmp;
cur->nsMax = tmpSize;
}
cur->nsTab[cur->nsCurEnd] = ns;
cur->nodeTab[cur->nsCurEnd] = node;
++cur->nsCurEnd;
return (0);
}
static void
xmlC14NVisibleNsStackSave(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
if((cur == NULL) || (state == NULL)) {
xmlC14NErrParam(NULL);
return;
}
state->nsCurEnd = cur->nsCurEnd;
state->nsPrevStart = cur->nsPrevStart;
state->nsPrevEnd = cur->nsPrevEnd;
}
static void
xmlC14NVisibleNsStackRestore(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
if((cur == NULL) || (state == NULL)) {
xmlC14NErrParam(NULL);
return;
}
cur->nsCurEnd = state->nsCurEnd;
cur->nsPrevStart = state->nsPrevStart;
cur->nsPrevEnd = state->nsPrevEnd;
}
static void
xmlC14NVisibleNsStackShift(xmlC14NVisibleNsStackPtr cur) {
if(cur == NULL) {
xmlC14NErrParam(NULL);
return;
}
cur->nsPrevStart = cur->nsPrevEnd;
cur->nsPrevEnd = cur->nsCurEnd;
}
static int
xmlC14NStrEqual(const xmlChar *str1, const xmlChar *str2) {
if (str1 == str2) return(1);
if (str1 == NULL) return((*str2) == '\0');
if (str2 == NULL) return((*str1) == '\0');
do {
if (*str1++ != *str2) return(0);
} while (*str2++);
return(1);
}
/**
* xmlC14NVisibleNsStackFind:
* @ctx: the C14N context
* @ns: the namespace to check
*
* Checks whether the given namespace was already rendered or not
*
* Returns 1 if we already wrote this namespace or 0 otherwise
*/
static int
xmlC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns)
{
int i;
const xmlChar *prefix;
const xmlChar *href;
int has_empty_ns;
if(cur == NULL) {
xmlC14NErrParam(NULL);
return (0);
}
/*
* if the default namespace xmlns="" is not defined yet then
* we do not want to print it out
*/
prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
if (cur->nsTab != NULL) {
int start = (has_empty_ns) ? 0 : cur->nsPrevStart;
for (i = cur->nsCurEnd - 1; i >= start; --i) {
xmlNsPtr ns1 = cur->nsTab[i];
if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
return(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL));
}
}
}
return(has_empty_ns);
}
static int
xmlExcC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlC14NCtxPtr ctx) {
int i;
const xmlChar *prefix;
const xmlChar *href;
int has_empty_ns;
if(cur == NULL) {
xmlC14NErrParam(ctx);
return (0);
}
/*
* if the default namespace xmlns="" is not defined yet then
* we do not want to print it out
*/
prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
if (cur->nsTab != NULL) {
int start = 0;
for (i = cur->nsCurEnd - 1; i >= start; --i) {
xmlNsPtr ns1 = cur->nsTab[i];
if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
if(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL)) {
return(xmlC14NIsVisible(ctx, ns1, cur->nodeTab[i]));
} else {
return(0);
}
}
}
}
return(has_empty_ns);
}
/**
* xmlC14NIsXmlNs:
* @ns: the namespace to check
*
* Checks whether the given namespace is a default "xml:" namespace
* with href="http://www.w3.org/XML/1998/namespace"
*
* Returns 1 if the node is default or 0 otherwise
*/
/* todo: make it a define? */
static int
xmlC14NIsXmlNs(xmlNsPtr ns)
{
return ((ns != NULL) &&
(xmlStrEqual(ns->prefix, BAD_CAST "xml")) &&
(xmlStrEqual(ns->href, XML_XML_NAMESPACE)));
}
/**
* xmlC14NNsCompare:
* @ns1: the pointer to first namespace
* @ns2: the pointer to second namespace
*
* Compares the namespaces by names (prefixes).
*
* Returns -1 if ns1 < ns2, 0 if ns1 == ns2 or 1 if ns1 > ns2.
*/
static int
xmlC14NNsCompare(const void *data1, const void *data2)
{
const xmlNs *ns1 = data1;
const xmlNs *ns2 = data2;
if (ns1 == ns2)
return (0);
if (ns1 == NULL)
return (-1);
if (ns2 == NULL)
return (1);
return (xmlStrcmp(ns1->prefix, ns2->prefix));
}
/**
* xmlC14NPrintNamespaces:
* @ns: the pointer to namespace
* @ctx: the C14N context
*
* Prints the given namespace to the output buffer from C14N context.
*
* Returns 1 on success or 0 on fail.
*/
static int
xmlC14NPrintNamespaces(const xmlNs *ns, xmlC14NCtxPtr ctx)
{
if ((ns == NULL) || (ctx == NULL)) {
xmlC14NErrParam(ctx);
return 0;
}
if (ns->prefix != NULL) {
xmlOutputBufferWriteString(ctx->buf, " xmlns:");
xmlOutputBufferWriteString(ctx->buf, (const char *) ns->prefix);
xmlOutputBufferWriteString(ctx->buf, "=");
} else {
xmlOutputBufferWriteString(ctx->buf, " xmlns=");
}
if(ns->href != NULL) {
xmlOutputBufferWriteQuotedString(ctx->buf, ns->href);
} else {
xmlOutputBufferWriteString(ctx->buf, "\"\"");
}
return (1);
}
static int
xmlC14NPrintNamespacesWalker(const void *ns, void *ctx) {
return xmlC14NPrintNamespaces(ns, ctx);
}
/**
* xmlC14NProcessNamespacesAxis:
* @ctx: the C14N context
* @node: the current node
*
* Prints out canonical namespace axis of the current node to the
* buffer from C14N context as follows
*
* Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
*
* Namespace Axis
* Consider a list L containing only namespace nodes in the
* axis and in the node-set in lexicographic order (ascending). To begin
* processing L, if the first node is not the default namespace node (a node
* with no namespace URI and no local name), then generate a space followed
* by xmlns="" if and only if the following conditions are met:
* - the element E that owns the axis is in the node-set
* - The nearest ancestor element of E in the node-set has a default
* namespace node in the node-set (default namespace nodes always
* have non-empty values in XPath)
* The latter condition eliminates unnecessary occurrences of xmlns="" in
* the canonical form since an element only receives an xmlns="" if its
* default namespace is empty and if it has an immediate parent in the
* canonical form that has a non-empty default namespace. To finish
* processing L, simply process every namespace node in L, except omit
* namespace node with local name xml, which defines the xml prefix,
* if its string value is http://www.w3.org/XML/1998/namespace.
*
* Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
* Canonical XML applied to a document subset requires the search of the
* ancestor nodes of each orphan element node for attributes in the xml
* namespace, such as xml:lang and xml:space. These are copied into the
* element node except if a declaration of the same attribute is already
* in the attribute axis of the element (whether or not it is included in
* the document subset). This search and copying are omitted from the
* Exclusive XML Canonicalization method.
*
* Returns 0 on success or -1 on fail.
*/
static int
xmlC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
{
xmlNodePtr n;
xmlNsPtr ns, tmp;
xmlListPtr list;
int already_rendered;
int has_empty_ns = 0;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
/*
* Create a sorted list to store element namespaces
*/
list = xmlListCreate(NULL, xmlC14NNsCompare);
if (list == NULL) {
xmlC14NErrMemory(ctx);
return (-1);
}
/* check all namespaces */
for(n = cur; n != NULL; n = n->parent) {
for(ns = n->nsDef; ns != NULL; ns = ns->next) {
tmp = xmlSearchNs(cur->doc, cur, ns->prefix);
if((tmp == ns) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
if(visible) {
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
}
if(!already_rendered) {
xmlListInsert(list, ns);
}
if(xmlStrlen(ns->prefix) == 0) {
has_empty_ns = 1;
}
}
}
}
/**
* if the first node is not the default namespace node (a node with no
* namespace URI and no local name), then generate a space followed by
* xmlns="" if and only if the following conditions are met:
* - the element E that owns the axis is in the node-set
* - the nearest ancestor element of E in the node-set has a default
* namespace node in the node-set (default namespace nodes always
* have non-empty values in XPath)
*/
if(visible && !has_empty_ns) {
static xmlNs ns_default;
memset(&ns_default, 0, sizeof(ns_default));
if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
xmlC14NPrintNamespaces(&ns_default, ctx);
}
}
/*
* print out all elements from list
*/
xmlListWalk(list, xmlC14NPrintNamespacesWalker, (void *) ctx);
/*
* Cleanup
*/
error:
xmlListDelete(list);
return (0);
}
/**
* xmlExcC14NProcessNamespacesAxis:
* @ctx: the C14N context
* @node: the current node
*
* Prints out exclusive canonical namespace axis of the current node to the
* buffer from C14N context as follows
*
* Exclusive XML Canonicalization
* http://www.w3.org/TR/xml-exc-c14n
*
* If the element node is in the XPath subset then output the node in
* accordance with Canonical XML except for namespace nodes which are
* rendered as follows:
*
* 1. Render each namespace node iff:
* * it is visibly utilized by the immediate parent element or one of
* its attributes, or is present in InclusiveNamespaces PrefixList, and
* * its prefix and value do not appear in ns_rendered. ns_rendered is
* obtained by popping the state stack in order to obtain a list of
* prefixes and their values which have already been rendered by
* an output ancestor of the namespace node's parent element.
* 2. Append the rendered namespace node to the list ns_rendered of namespace
* nodes rendered by output ancestors. Push ns_rendered on state stack and
* recurse.
* 3. After the recursion returns, pop thestate stack.
*
*
* Returns 0 on success or -1 on fail.
*/
static int
xmlExcC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
{
xmlNsPtr ns;
xmlListPtr list;
xmlAttrPtr attr;
int already_rendered;
int has_empty_ns = 0;
int has_visibly_utilized_empty_ns = 0;
int has_empty_ns_in_inclusive_list = 0;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
if(!xmlC14NIsExclusive(ctx)) {
xmlC14NErrParam(ctx);
return (-1);
}
/*
* Create a sorted list to store element namespaces
*/
list = xmlListCreate(NULL, xmlC14NNsCompare);
if (list == NULL) {
xmlC14NErrMemory(ctx);
return (-1);
}
/*
* process inclusive namespaces:
* All namespace nodes appearing on inclusive ns list are
* handled as provided in Canonical XML
*/
if(ctx->inclusive_ns_prefixes != NULL) {
xmlChar *prefix;
int i;
for (i = 0; ctx->inclusive_ns_prefixes[i] != NULL; ++i) {
prefix = ctx->inclusive_ns_prefixes[i];
/*
* Special values for namespace with empty prefix
*/
if (xmlStrEqual(prefix, BAD_CAST "#default")
|| xmlStrEqual(prefix, BAD_CAST "")) {
prefix = NULL;
has_empty_ns_in_inclusive_list = 1;
}
ns = xmlSearchNs(cur->doc, cur, prefix);
if((ns != NULL) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
if(visible) {
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
}
if(!already_rendered) {
xmlListInsert(list, ns);
}
if(xmlStrlen(ns->prefix) == 0) {
has_empty_ns = 1;
}
}
}
}
/* add node namespace */
if(cur->ns != NULL) {
ns = cur->ns;
} else {
ns = xmlSearchNs(cur->doc, cur, NULL);
has_visibly_utilized_empty_ns = 1;
}
if((ns != NULL) && !xmlC14NIsXmlNs(ns)) {
if(visible && xmlC14NIsVisible(ctx, ns, cur)) {
if(!xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, ns, ctx)) {
xmlListInsert(list, ns);
}
}
if(visible) {
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
}
if(xmlStrlen(ns->prefix) == 0) {
has_empty_ns = 1;
}
}
/* add attributes */
for(attr = cur->properties; attr != NULL; attr = attr->next) {
/*
* we need to check that attribute is visible and has non
* default namespace (XML Namespaces: "default namespaces
* do not apply directly to attributes")
*/
if((attr->ns != NULL) && !xmlC14NIsXmlNs(attr->ns) && xmlC14NIsVisible(ctx, attr, cur)) {
already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, attr->ns, ctx);
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, attr->ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
if(!already_rendered && visible) {
xmlListInsert(list, attr->ns);
}
if(xmlStrlen(attr->ns->prefix) == 0) {
has_empty_ns = 1;
}
} else if((attr->ns != NULL) && (xmlStrlen(attr->ns->prefix) == 0) && (xmlStrlen(attr->ns->href) == 0)) {
has_visibly_utilized_empty_ns = 1;
}
}
/*
* Process xmlns=""
*/
if(visible && has_visibly_utilized_empty_ns &&
!has_empty_ns && !has_empty_ns_in_inclusive_list) {
static xmlNs ns_default;
memset(&ns_default, 0, sizeof(ns_default));
already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default, ctx);
if(!already_rendered) {
xmlC14NPrintNamespaces(&ns_default, ctx);
}
} else if(visible && !has_empty_ns && has_empty_ns_in_inclusive_list) {
static xmlNs ns_default;
memset(&ns_default, 0, sizeof(ns_default));
if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
xmlC14NPrintNamespaces(&ns_default, ctx);
}
}
/*
* print out all elements from list
*/
xmlListWalk(list, xmlC14NPrintNamespacesWalker, (void *) ctx);
/*
* Cleanup
*/
error:
xmlListDelete(list);
return (0);
}
/**
* xmlC14NIsXmlAttr:
* @attr: the attr to check
*
* Checks whether the given attribute is a default "xml:" namespace
* with href="http://www.w3.org/XML/1998/namespace"
*
* Returns 1 if the node is default or 0 otherwise
*/
/* todo: make it a define? */
static int
xmlC14NIsXmlAttr(xmlAttrPtr attr)
{
return ((attr->ns != NULL) &&
(xmlC14NIsXmlNs(attr->ns) != 0));
}
/**
* xmlC14NAttrsCompare:
* @attr1: the pointer tls o first attr
* @attr2: the pointer to second attr
*
* Prints the given attribute to the output buffer from C14N context.
*
* Returns -1 if attr1 < attr2, 0 if attr1 == attr2 or 1 if attr1 > attr2.
*/
static int
xmlC14NAttrsCompare(const void *data1, const void *data2)
{
const xmlAttr *attr1 = data1;
const xmlAttr *attr2 = data2;
int ret = 0;
/*
* Simple cases
*/
if (attr1 == attr2)
return (0);
if (attr1 == NULL)
return (-1);
if (attr2 == NULL)
return (1);
if (attr1->ns == attr2->ns) {
return (xmlStrcmp(attr1->name, attr2->name));
}
/*
* Attributes in the default namespace are first
* because the default namespace is not applied to
* unqualified attributes
*/
if (attr1->ns == NULL)
return (-1);
if (attr2->ns == NULL)
return (1);
if (attr1->ns->prefix == NULL)
return (-1);
if (attr2->ns->prefix == NULL)
return (1);
ret = xmlStrcmp(attr1->ns->href, attr2->ns->href);
if (ret == 0) {
ret = xmlStrcmp(attr1->name, attr2->name);
}
return (ret);
}
/**
* xmlC14NPrintAttrs:
* @attr: the pointer to attr
* @ctx: the C14N context
*
* Prints out canonical attribute urrent node to the
* buffer from C14N context as follows
*
* Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
*
* Returns 1 on success or 0 on fail.
*/
static int
xmlC14NPrintAttrs(const void *data, void *user)
{
const xmlAttr *attr = data;
xmlC14NCtxPtr ctx = (xmlC14NCtxPtr) user;
xmlChar *value;
xmlChar *buffer;
if ((attr == NULL) || (ctx == NULL)) {
xmlC14NErrParam(ctx);
return (0);
}
xmlOutputBufferWriteString(ctx->buf, " ");
if (attr->ns != NULL && xmlStrlen(attr->ns->prefix) > 0) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) attr->ns->prefix);
xmlOutputBufferWriteString(ctx->buf, ":");
}
xmlOutputBufferWriteString(ctx->buf, (const char *) attr->name);
xmlOutputBufferWriteString(ctx->buf, "=\"");
value = xmlNodeListGetString(ctx->doc, attr->children, 1);
/* todo: should we log an error if value==NULL ? */
if (value != NULL) {
buffer = xmlC11NNormalizeAttr(value);
xmlFree(value);
if (buffer != NULL) {
xmlOutputBufferWriteString(ctx->buf, (const char *) buffer);
xmlFree(buffer);
} else {
xmlC14NErrMemory(ctx);
return (0);
}
}
xmlOutputBufferWriteString(ctx->buf, "\"");
return (1);
}
/**
* xmlC14NFindHiddenParentAttr:
*
* Finds an attribute in a hidden parent node.
*
* Returns a pointer to the attribute node (if found) or NULL otherwise.
*/
static xmlAttrPtr
xmlC14NFindHiddenParentAttr(xmlC14NCtxPtr ctx, xmlNodePtr cur, const xmlChar * name, const xmlChar * ns)
{
xmlAttrPtr res;
while((cur != NULL) && (!xmlC14NIsVisible(ctx, cur, cur->parent))) {
res = xmlHasNsProp(cur, name, ns);
if(res != NULL) {
return res;
}
cur = cur->parent;
}
return NULL;
}