1 /*
2 * "Canonical XML" implementation
3 * http://www.w3.org/TR/xml-c14n
4 *
5 * "Exclusive XML Canonicalization" implementation
6 * http://www.w3.org/TR/xml-exc-c14n
7 *
8 * See Copyright for the status of this software.
9 *
10 * Author: Aleksey Sanin <aleksey@aleksey.com>
11 */
12 #define IN_LIBXML
13 #include "libxml.h"
14 #ifdef LIBXML_C14N_ENABLED
15 #ifdef LIBXML_OUTPUT_ENABLED
16
17 #ifdef HAVE_STDLIB_H
18 #include <stdlib.h>
19 #endif
20 #include <string.h>
21
22 #include <libxml/tree.h>
23 #include <libxml/parser.h>
24 #include <libxml/uri.h>
25 #include <libxml/xmlerror.h>
26 #include <libxml/globals.h>
27 #include <libxml/xpathInternals.h>
28 #include <libxml/c14n.h>
29
30 /************************************************************************
31 * *
32 * Some declaration better left private ATM *
33 * *
34 ************************************************************************/
35
36 typedef enum {
37 XMLC14N_BEFORE_DOCUMENT_ELEMENT = 0,
38 XMLC14N_INSIDE_DOCUMENT_ELEMENT = 1,
39 XMLC14N_AFTER_DOCUMENT_ELEMENT = 2
40 } xmlC14NPosition;
41
42 typedef struct _xmlC14NVisibleNsStack {
43 int nsCurEnd; /* number of nodes in the set */
44 int nsPrevStart; /* the begginning of the stack for previous visible node */
45 int nsPrevEnd; /* the end of the stack for previous visible node */
46 int nsMax; /* size of the array as allocated */
47 xmlNsPtr *nsTab; /* array of ns in no particular order */
48 xmlNodePtr *nodeTab; /* array of nodes in no particular order */
49 } xmlC14NVisibleNsStack, *xmlC14NVisibleNsStackPtr;
50
51 typedef struct _xmlC14NCtx {
52 /* input parameters */
53 xmlDocPtr doc;
54 xmlC14NIsVisibleCallback is_visible_callback;
55 void* user_data;
56 int with_comments;
57 xmlOutputBufferPtr buf;
58
59 /* position in the XML document */
60 xmlC14NPosition pos;
61 int parent_is_doc;
62 xmlC14NVisibleNsStackPtr ns_rendered;
63
64 /* exclusive canonicalization */
65 int exclusive;
66 xmlChar **inclusive_ns_prefixes;
67
68 /* error number */
69 int error;
70 } xmlC14NCtx, *xmlC14NCtxPtr;
71
72 static xmlC14NVisibleNsStackPtr xmlC14NVisibleNsStackCreate (void);
73 static void xmlC14NVisibleNsStackDestroy (xmlC14NVisibleNsStackPtr cur);
74 static void xmlC14NVisibleNsStackAdd (xmlC14NVisibleNsStackPtr cur,
75 xmlNsPtr ns,
76 xmlNodePtr node);
77 static void xmlC14NVisibleNsStackSave (xmlC14NVisibleNsStackPtr cur,
78 xmlC14NVisibleNsStackPtr state);
79 static void xmlC14NVisibleNsStackRestore (xmlC14NVisibleNsStackPtr cur,
80 xmlC14NVisibleNsStackPtr state);
81 static void xmlC14NVisibleNsStackShift (xmlC14NVisibleNsStackPtr cur);
82 static int xmlC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
83 xmlNsPtr ns);
84 static int xmlExcC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
85 xmlNsPtr ns,
86 xmlC14NCtxPtr ctx);
87
88 static int xmlC14NIsNodeInNodeset (xmlNodeSetPtr nodes,
89 xmlNodePtr node,
90 xmlNodePtr parent);
91
92
93
94 static int xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur);
95 static int xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur);
96 typedef enum {
97 XMLC14N_NORMALIZE_ATTR = 0,
98 XMLC14N_NORMALIZE_COMMENT = 1,
99 XMLC14N_NORMALIZE_PI = 2,
100 XMLC14N_NORMALIZE_TEXT = 3
101 } xmlC14NNormalizationMode;
102
103 static xmlChar *xmlC11NNormalizeString(const xmlChar * input,
104 xmlC14NNormalizationMode mode);
105
106 #define xmlC11NNormalizeAttr( a ) \
107 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_ATTR)
108 #define xmlC11NNormalizeComment( a ) \
109 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_COMMENT)
110 #define xmlC11NNormalizePI( a ) \
111 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_PI)
112 #define xmlC11NNormalizeText( a ) \
113 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_TEXT)
114
115 #define xmlC14NIsVisible( ctx, node, parent ) \
116 (((ctx)->is_visible_callback != NULL) ? \
117 (ctx)->is_visible_callback((ctx)->user_data, \
118 (xmlNodePtr)(node), (xmlNodePtr)(parent)) : 1)
119
120 /************************************************************************
121 * *
122 * Some factorized error routines *
123 * *
124 ************************************************************************/
125
126 /**
127 * xmlC14NErrMemory:
128 * @extra: extra informations
129 *
130 * Handle a redefinition of memory error
131 */
132 static void
xmlC14NErrMemory(const char * extra)133 xmlC14NErrMemory(const char *extra)
134 {
135 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
136 XML_ERR_NO_MEMORY, XML_ERR_ERROR, NULL, 0, extra,
137 NULL, NULL, 0, 0,
138 "Memory allocation failed : %s\n", extra);
139 }
140
141 /**
142 * xmlC14NErrParam:
143 * @extra: extra informations
144 *
145 * Handle a redefinition of param error
146 */
147 static void
xmlC14NErrParam(const char * extra)148 xmlC14NErrParam(const char *extra)
149 {
150 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
151 XML_ERR_INTERNAL_ERROR, XML_ERR_ERROR, NULL, 0, extra,
152 NULL, NULL, 0, 0,
153 "Invalid parameter : %s\n", extra);
154 }
155
156 /**
157 * xmlC14NErrInternal:
158 * @extra: extra informations
159 *
160 * Handle a redefinition of internal error
161 */
162 static void
xmlC14NErrInternal(const char * extra)163 xmlC14NErrInternal(const char *extra)
164 {
165 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
166 XML_ERR_INTERNAL_ERROR, XML_ERR_ERROR, NULL, 0, extra,
167 NULL, NULL, 0, 0,
168 "Internal error : %s\n", extra);
169 }
170
171 /**
172 * xmlC14NErrInvalidNode:
173 * @extra: extra informations
174 *
175 * Handle a redefinition of invalid node error
176 */
177 static void
xmlC14NErrInvalidNode(const char * node_type,const char * extra)178 xmlC14NErrInvalidNode(const char *node_type, const char *extra)
179 {
180 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
181 XML_C14N_INVALID_NODE, XML_ERR_ERROR, NULL, 0, extra,
182 NULL, NULL, 0, 0,
183 "Node %s is invalid here : %s\n", node_type, extra);
184 }
185
186 /**
187 * xmlC14NErrUnknownNode:
188 * @extra: extra informations
189 *
190 * Handle a redefinition of unknown node error
191 */
192 static void
xmlC14NErrUnknownNode(int node_type,const char * extra)193 xmlC14NErrUnknownNode(int node_type, const char *extra)
194 {
195 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
196 XML_C14N_UNKNOW_NODE, XML_ERR_ERROR, NULL, 0, extra,
197 NULL, NULL, 0, 0,
198 "Unknown node type %d found : %s\n", node_type, extra);
199 }
200
201 /**
202 * xmlC14NErrRelativeNamespace:
203 * @extra: extra informations
204 *
205 * Handle a redefinition of relative namespace error
206 */
207 static void
xmlC14NErrRelativeNamespace(const char * ns_uri)208 xmlC14NErrRelativeNamespace(const char *ns_uri)
209 {
210 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
211 XML_C14N_RELATIVE_NAMESPACE, XML_ERR_ERROR, NULL, 0, NULL,
212 NULL, NULL, 0, 0,
213 "Relative namespace UR is invalid here : %s\n", ns_uri);
214 }
215
216
217
218 /**
219 * xmlC14NErr:
220 * @ctxt: a C14N evaluation context
221 * @node: the context node
222 * @error: the erorr code
223 * @msg: the message
224 * @extra: extra informations
225 *
226 * Handle a redefinition of attribute error
227 */
228 static void
xmlC14NErr(xmlC14NCtxPtr ctxt,xmlNodePtr node,int error,const char * msg)229 xmlC14NErr(xmlC14NCtxPtr ctxt, xmlNodePtr node, int error,
230 const char * msg)
231 {
232 if (ctxt != NULL)
233 ctxt->error = error;
234 __xmlRaiseError(NULL, NULL, NULL,
235 ctxt, node, XML_FROM_C14N, error,
236 XML_ERR_ERROR, NULL, 0,
237 NULL, NULL, NULL, 0, 0, "%s", msg);
238 }
239
240 /************************************************************************
241 * *
242 * The implementation internals *
243 * *
244 ************************************************************************/
245 #define XML_NAMESPACES_DEFAULT 16
246
247 static int
xmlC14NIsNodeInNodeset(xmlNodeSetPtr nodes,xmlNodePtr node,xmlNodePtr parent)248 xmlC14NIsNodeInNodeset(xmlNodeSetPtr nodes, xmlNodePtr node, xmlNodePtr parent) {
249 if((nodes != NULL) && (node != NULL)) {
250 if(node->type != XML_NAMESPACE_DECL) {
251 return(xmlXPathNodeSetContains(nodes, node));
252 } else {
253 xmlNs ns;
254
255 memcpy(&ns, node, sizeof(ns));
256
257 /* this is a libxml hack! check xpath.c for details */
258 if((parent != NULL) && (parent->type == XML_ATTRIBUTE_NODE)) {
259 ns.next = (xmlNsPtr)parent->parent;
260 } else {
261 ns.next = (xmlNsPtr)parent;
262 }
263
264 /*
265 * If the input is an XPath node-set, then the node-set must explicitly
266 * contain every node to be rendered to the canonical form.
267 */
268 return(xmlXPathNodeSetContains(nodes, (xmlNodePtr)&ns));
269 }
270 }
271 return(1);
272 }
273
274 static xmlC14NVisibleNsStackPtr
xmlC14NVisibleNsStackCreate(void)275 xmlC14NVisibleNsStackCreate(void) {
276 xmlC14NVisibleNsStackPtr ret;
277
278 ret = (xmlC14NVisibleNsStackPtr) xmlMalloc(sizeof(xmlC14NVisibleNsStack));
279 if (ret == NULL) {
280 xmlC14NErrMemory("creating namespaces stack");
281 return(NULL);
282 }
283 memset(ret, 0 , (size_t) sizeof(xmlC14NVisibleNsStack));
284 return(ret);
285 }
286
287 static void
xmlC14NVisibleNsStackDestroy(xmlC14NVisibleNsStackPtr cur)288 xmlC14NVisibleNsStackDestroy(xmlC14NVisibleNsStackPtr cur) {
289 if(cur == NULL) {
290 xmlC14NErrParam("destroying namespaces stack");
291 return;
292 }
293 if(cur->nsTab != NULL) {
294 memset(cur->nsTab, 0, cur->nsMax * sizeof(xmlNsPtr));
295 xmlFree(cur->nsTab);
296 }
297 if(cur->nodeTab != NULL) {
298 memset(cur->nodeTab, 0, cur->nsMax * sizeof(xmlNodePtr));
299 xmlFree(cur->nodeTab);
300 }
301 memset(cur, 0, sizeof(xmlC14NVisibleNsStack));
302 xmlFree(cur);
303
304 }
305
306 static void
xmlC14NVisibleNsStackAdd(xmlC14NVisibleNsStackPtr cur,xmlNsPtr ns,xmlNodePtr node)307 xmlC14NVisibleNsStackAdd(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlNodePtr node) {
308 if((cur == NULL) ||
309 ((cur->nsTab == NULL) && (cur->nodeTab != NULL)) ||
310 ((cur->nsTab != NULL) && (cur->nodeTab == NULL))) {
311 xmlC14NErrParam("adding namespace to stack");
312 return;
313 }
314
315 if ((cur->nsTab == NULL) && (cur->nodeTab == NULL)) {
316 cur->nsTab = (xmlNsPtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
317 cur->nodeTab = (xmlNodePtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
318 if ((cur->nsTab == NULL) || (cur->nodeTab == NULL)) {
319 xmlC14NErrMemory("adding node to stack");
320 return;
321 }
322 memset(cur->nsTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
323 memset(cur->nodeTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
324 cur->nsMax = XML_NAMESPACES_DEFAULT;
325 } else if(cur->nsMax == cur->nsCurEnd) {
326 void *tmp;
327 int tmpSize;
328
329 tmpSize = 2 * cur->nsMax;
330 tmp = xmlRealloc(cur->nsTab, tmpSize * sizeof(xmlNsPtr));
331 if (tmp == NULL) {
332 xmlC14NErrMemory("adding node to stack");
333 return;
334 }
335 cur->nsTab = (xmlNsPtr*)tmp;
336
337 tmp = xmlRealloc(cur->nodeTab, tmpSize * sizeof(xmlNodePtr));
338 if (tmp == NULL) {
339 xmlC14NErrMemory("adding node to stack");
340 return;
341 }
342 cur->nodeTab = (xmlNodePtr*)tmp;
343
344 cur->nsMax = tmpSize;
345 }
346 cur->nsTab[cur->nsCurEnd] = ns;
347 cur->nodeTab[cur->nsCurEnd] = node;
348
349 ++cur->nsCurEnd;
350 }
351
352 static void
xmlC14NVisibleNsStackSave(xmlC14NVisibleNsStackPtr cur,xmlC14NVisibleNsStackPtr state)353 xmlC14NVisibleNsStackSave(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
354 if((cur == NULL) || (state == NULL)) {
355 xmlC14NErrParam("saving namespaces stack");
356 return;
357 }
358
359 state->nsCurEnd = cur->nsCurEnd;
360 state->nsPrevStart = cur->nsPrevStart;
361 state->nsPrevEnd = cur->nsPrevEnd;
362 }
363
364 static void
xmlC14NVisibleNsStackRestore(xmlC14NVisibleNsStackPtr cur,xmlC14NVisibleNsStackPtr state)365 xmlC14NVisibleNsStackRestore(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
366 if((cur == NULL) || (state == NULL)) {
367 xmlC14NErrParam("restoring namespaces stack");
368 return;
369 }
370 cur->nsCurEnd = state->nsCurEnd;
371 cur->nsPrevStart = state->nsPrevStart;
372 cur->nsPrevEnd = state->nsPrevEnd;
373 }
374
375 static void
xmlC14NVisibleNsStackShift(xmlC14NVisibleNsStackPtr cur)376 xmlC14NVisibleNsStackShift(xmlC14NVisibleNsStackPtr cur) {
377 if(cur == NULL) {
378 xmlC14NErrParam("shifting namespaces stack");
379 return;
380 }
381 cur->nsPrevStart = cur->nsPrevEnd;
382 cur->nsPrevEnd = cur->nsCurEnd;
383 }
384
385 static int
xmlC14NStrEqual(const xmlChar * str1,const xmlChar * str2)386 xmlC14NStrEqual(const xmlChar *str1, const xmlChar *str2) {
387 if (str1 == str2) return(1);
388 if (str1 == NULL) return((*str2) == '\0');
389 if (str2 == NULL) return((*str1) == '\0');
390 do {
391 if (*str1++ != *str2) return(0);
392 } while (*str2++);
393 return(1);
394 }
395
396 /**
397 * xmlC14NVisibleNsStackFind:
398 * @ctx: the C14N context
399 * @ns: the namespace to check
400 *
401 * Checks whether the given namespace was already rendered or not
402 *
403 * Returns 1 if we already wrote this namespace or 0 otherwise
404 */
405 static int
xmlC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur,xmlNsPtr ns)406 xmlC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns)
407 {
408 int i;
409 const xmlChar *prefix;
410 const xmlChar *href;
411 int has_empty_ns;
412
413 if(cur == NULL) {
414 xmlC14NErrParam("searching namespaces stack (c14n)");
415 return (0);
416 }
417
418 /*
419 * if the default namespace xmlns="" is not defined yet then
420 * we do not want to print it out
421 */
422 prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
423 href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
424 has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
425
426 if (cur->nsTab != NULL) {
427 int start = (has_empty_ns) ? 0 : cur->nsPrevStart;
428 for (i = cur->nsCurEnd - 1; i >= start; --i) {
429 xmlNsPtr ns1 = cur->nsTab[i];
430
431 if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
432 return(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL));
433 }
434 }
435 }
436 return(has_empty_ns);
437 }
438
439 static int
xmlExcC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur,xmlNsPtr ns,xmlC14NCtxPtr ctx)440 xmlExcC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlC14NCtxPtr ctx) {
441 int i;
442 const xmlChar *prefix;
443 const xmlChar *href;
444 int has_empty_ns;
445
446 if(cur == NULL) {
447 xmlC14NErrParam("searching namespaces stack (exc c14n)");
448 return (0);
449 }
450
451 /*
452 * if the default namespace xmlns="" is not defined yet then
453 * we do not want to print it out
454 */
455 prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
456 href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
457 has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
458
459 if (cur->nsTab != NULL) {
460 int start = 0;
461 for (i = cur->nsCurEnd - 1; i >= start; --i) {
462 xmlNsPtr ns1 = cur->nsTab[i];
463
464 if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
465 if(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL)) {
466 return(xmlC14NIsVisible(ctx, ns1, cur->nodeTab[i]));
467 } else {
468 return(0);
469 }
470 }
471 }
472 }
473 return(has_empty_ns);
474 }
475
476
477
478
479 /**
480 * xmlC14NIsXmlNs:
481 * @ns: the namespace to check
482 *
483 * Checks whether the given namespace is a default "xml:" namespace
484 * with href="http://www.w3.org/XML/1998/namespace"
485 *
486 * Returns 1 if the node is default or 0 otherwise
487 */
488
489 /* todo: make it a define? */
490 static int
xmlC14NIsXmlNs(xmlNsPtr ns)491 xmlC14NIsXmlNs(xmlNsPtr ns)
492 {
493 return ((ns != NULL) &&
494 (xmlStrEqual(ns->prefix, BAD_CAST "xml")) &&
495 (xmlStrEqual(ns->href,
496 BAD_CAST
497 "http://www.w3.org/XML/1998/namespace")));
498 }
499
500
501 /**
502 * xmlC14NNsCompare:
503 * @ns1: the pointer to first namespace
504 * @ns2: the pointer to second namespace
505 *
506 * Compares the namespaces by names (prefixes).
507 *
508 * Returns -1 if ns1 < ns2, 0 if ns1 == ns2 or 1 if ns1 > ns2.
509 */
510 static int
xmlC14NNsCompare(xmlNsPtr ns1,xmlNsPtr ns2)511 xmlC14NNsCompare(xmlNsPtr ns1, xmlNsPtr ns2)
512 {
513 if (ns1 == ns2)
514 return (0);
515 if (ns1 == NULL)
516 return (-1);
517 if (ns2 == NULL)
518 return (1);
519
520 return (xmlStrcmp(ns1->prefix, ns2->prefix));
521 }
522
523
524 /**
525 * xmlC14NPrintNamespaces:
526 * @ns: the pointer to namespace
527 * @ctx: the C14N context
528 *
529 * Prints the given namespace to the output buffer from C14N context.
530 *
531 * Returns 1 on success or 0 on fail.
532 */
533 static int
xmlC14NPrintNamespaces(const xmlNsPtr ns,xmlC14NCtxPtr ctx)534 xmlC14NPrintNamespaces(const xmlNsPtr ns, xmlC14NCtxPtr ctx)
535 {
536
537 if ((ns == NULL) || (ctx == NULL)) {
538 xmlC14NErrParam("writing namespaces");
539 return 0;
540 }
541
542 if (ns->prefix != NULL) {
543 xmlOutputBufferWriteString(ctx->buf, " xmlns:");
544 xmlOutputBufferWriteString(ctx->buf, (const char *) ns->prefix);
545 xmlOutputBufferWriteString(ctx->buf, "=\"");
546 } else {
547 xmlOutputBufferWriteString(ctx->buf, " xmlns=\"");
548 }
549 if(ns->href != NULL) {
550 xmlOutputBufferWriteString(ctx->buf, (const char *) ns->href);
551 }
552 xmlOutputBufferWriteString(ctx->buf, "\"");
553 return (1);
554 }
555
556 /**
557 * xmlC14NProcessNamespacesAxis:
558 * @ctx: the C14N context
559 * @node: the current node
560 *
561 * Prints out canonical namespace axis of the current node to the
562 * buffer from C14N context as follows
563 *
564 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
565 *
566 * Namespace Axis
567 * Consider a list L containing only namespace nodes in the
568 * axis and in the node-set in lexicographic order (ascending). To begin
569 * processing L, if the first node is not the default namespace node (a node
570 * with no namespace URI and no local name), then generate a space followed
571 * by xmlns="" if and only if the following conditions are met:
572 * - the element E that owns the axis is in the node-set
573 * - The nearest ancestor element of E in the node-set has a default
574 * namespace node in the node-set (default namespace nodes always
575 * have non-empty values in XPath)
576 * The latter condition eliminates unnecessary occurrences of xmlns="" in
577 * the canonical form since an element only receives an xmlns="" if its
578 * default namespace is empty and if it has an immediate parent in the
579 * canonical form that has a non-empty default namespace. To finish
580 * processing L, simply process every namespace node in L, except omit
581 * namespace node with local name xml, which defines the xml prefix,
582 * if its string value is http://www.w3.org/XML/1998/namespace.
583 *
584 * Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
585 * Canonical XML applied to a document subset requires the search of the
586 * ancestor nodes of each orphan element node for attributes in the xml
587 * namespace, such as xml:lang and xml:space. These are copied into the
588 * element node except if a declaration of the same attribute is already
589 * in the attribute axis of the element (whether or not it is included in
590 * the document subset). This search and copying are omitted from the
591 * Exclusive XML Canonicalization method.
592 *
593 * Returns 0 on success or -1 on fail.
594 */
595 static int
xmlC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx,xmlNodePtr cur,int visible)596 xmlC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
597 {
598 xmlNodePtr n;
599 xmlNsPtr ns, tmp;
600 xmlListPtr list;
601 int already_rendered;
602 int has_empty_ns = 0;
603
604 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
605 xmlC14NErrParam("processing namespaces axis (c14n)");
606 return (-1);
607 }
608
609 /*
610 * Create a sorted list to store element namespaces
611 */
612 list = xmlListCreate(NULL, (xmlListDataCompare) xmlC14NNsCompare);
613 if (list == NULL) {
614 xmlC14NErrInternal("creating namespaces list (c14n)");
615 return (-1);
616 }
617
618 /* check all namespaces */
619 for(n = cur; n != NULL; n = n->parent) {
620 for(ns = n->nsDef; ns != NULL; ns = ns->next) {
621 tmp = xmlSearchNs(cur->doc, cur, ns->prefix);
622
623 if((tmp == ns) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
624 already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
625 if(visible) {
626 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
627 }
628 if(!already_rendered) {
629 xmlListInsert(list, ns);
630 }
631 if(xmlStrlen(ns->prefix) == 0) {
632 has_empty_ns = 1;
633 }
634 }
635 }
636 }
637
638 /**
639 * if the first node is not the default namespace node (a node with no
640 * namespace URI and no local name), then generate a space followed by
641 * xmlns="" if and only if the following conditions are met:
642 * - the element E that owns the axis is in the node-set
643 * - the nearest ancestor element of E in the node-set has a default
644 * namespace node in the node-set (default namespace nodes always
645 * have non-empty values in XPath)
646 */
647 if(visible && !has_empty_ns) {
648 static xmlNs ns_default;
649
650 memset(&ns_default, 0, sizeof(ns_default));
651 if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
652 xmlC14NPrintNamespaces(&ns_default, ctx);
653 }
654 }
655
656
657 /*
658 * print out all elements from list
659 */
660 xmlListWalk(list, (xmlListWalker) xmlC14NPrintNamespaces, (const void *) ctx);
661
662 /*
663 * Cleanup
664 */
665 xmlListDelete(list);
666 return (0);
667 }
668
669
670 /**
671 * xmlExcC14NProcessNamespacesAxis:
672 * @ctx: the C14N context
673 * @node: the current node
674 *
675 * Prints out exclusive canonical namespace axis of the current node to the
676 * buffer from C14N context as follows
677 *
678 * Exclusive XML Canonicalization
679 * http://www.w3.org/TR/xml-exc-c14n
680 *
681 * If the element node is in the XPath subset then output the node in
682 * accordance with Canonical XML except for namespace nodes which are
683 * rendered as follows:
684 *
685 * 1. Render each namespace node iff:
686 * * it is visibly utilized by the immediate parent element or one of
687 * its attributes, or is present in InclusiveNamespaces PrefixList, and
688 * * its prefix and value do not appear in ns_rendered. ns_rendered is
689 * obtained by popping the state stack in order to obtain a list of
690 * prefixes and their values which have already been rendered by
691 * an output ancestor of the namespace node's parent element.
692 * 2. Append the rendered namespace node to the list ns_rendered of namespace
693 * nodes rendered by output ancestors. Push ns_rendered on state stack and
694 * recurse.
695 * 3. After the recursion returns, pop thestate stack.
696 *
697 *
698 * Returns 0 on success or -1 on fail.
699 */
700 static int
xmlExcC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx,xmlNodePtr cur,int visible)701 xmlExcC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
702 {
703 xmlNsPtr ns;
704 xmlListPtr list;
705 xmlAttrPtr attr;
706 int already_rendered;
707 int has_empty_ns = 0;
708 int has_visibly_utilized_empty_ns = 0;
709 int has_empty_ns_in_inclusive_list = 0;
710
711 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
712 xmlC14NErrParam("processing namespaces axis (exc c14n)");
713 return (-1);
714 }
715
716 if(!ctx->exclusive) {
717 xmlC14NErrParam("processing namespaces axis (exc c14n)");
718 return (-1);
719
720 }
721
722 /*
723 * Create a sorted list to store element namespaces
724 */
725 list = xmlListCreate(NULL, (xmlListDataCompare) xmlC14NNsCompare);
726 if (list == NULL) {
727 xmlC14NErrInternal("creating namespaces list (exc c14n)");
728 return (-1);
729 }
730
731 /*
732 * process inclusive namespaces:
733 * All namespace nodes appearing on inclusive ns list are
734 * handled as provided in Canonical XML
735 */
736 if(ctx->inclusive_ns_prefixes != NULL) {
737 xmlChar *prefix;
738 int i;
739
740 for (i = 0; ctx->inclusive_ns_prefixes[i] != NULL; ++i) {
741 prefix = ctx->inclusive_ns_prefixes[i];
742 /*
743 * Special values for namespace with empty prefix
744 */
745 if (xmlStrEqual(prefix, BAD_CAST "#default")
746 || xmlStrEqual(prefix, BAD_CAST "")) {
747 prefix = NULL;
748 has_empty_ns_in_inclusive_list = 1;
749 }
750
751 ns = xmlSearchNs(cur->doc, cur, prefix);
752 if((ns != NULL) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
753 already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
754 if(visible) {
755 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
756 }
757 if(!already_rendered) {
758 xmlListInsert(list, ns);
759 }
760 if(xmlStrlen(ns->prefix) == 0) {
761 has_empty_ns = 1;
762 }
763 }
764 }
765 }
766
767 /* add node namespace */
768 if(cur->ns != NULL) {
769 ns = cur->ns;
770 } else {
771 ns = xmlSearchNs(cur->doc, cur, NULL);
772 has_visibly_utilized_empty_ns = 1;
773 }
774 if((ns != NULL) && !xmlC14NIsXmlNs(ns)) {
775 if(visible && xmlC14NIsVisible(ctx, ns, cur)) {
776 if(!xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, ns, ctx)) {
777 xmlListInsert(list, ns);
778 }
779 }
780 if(visible) {
781 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
782 }
783 if(xmlStrlen(ns->prefix) == 0) {
784 has_empty_ns = 1;
785 }
786 }
787
788
789 /* add attributes */
790 for(attr = cur->properties; attr != NULL; attr = attr->next) {
791 /*
792 * we need to check that attribute is visible and has non
793 * default namespace (XML Namespaces: "default namespaces
794 * do not apply directly to attributes")
795 */
796 if((attr->ns != NULL) && !xmlC14NIsXmlNs(attr->ns) && xmlC14NIsVisible(ctx, attr, cur)) {
797 already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, attr->ns, ctx);
798 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, attr->ns, cur);
799 if(!already_rendered && visible) {
800 xmlListInsert(list, attr->ns);
801 }
802 if(xmlStrlen(attr->ns->prefix) == 0) {
803 has_empty_ns = 1;
804 }
805 } else if((attr->ns != NULL) && (xmlStrlen(attr->ns->prefix) == 0) && (xmlStrlen(attr->ns->href) == 0)) {
806 has_visibly_utilized_empty_ns = 1;
807 }
808 }
809
810 /*
811 * Process xmlns=""
812 */
813 if(visible && has_visibly_utilized_empty_ns &&
814 !has_empty_ns && !has_empty_ns_in_inclusive_list) {
815 static xmlNs ns_default;
816
817 memset(&ns_default, 0, sizeof(ns_default));
818
819 already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default, ctx);
820 if(!already_rendered) {
821 xmlC14NPrintNamespaces(&ns_default, ctx);
822 }
823 } else if(visible && !has_empty_ns && has_empty_ns_in_inclusive_list) {
824 static xmlNs ns_default;
825
826 memset(&ns_default, 0, sizeof(ns_default));
827 if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
828 xmlC14NPrintNamespaces(&ns_default, ctx);
829 }
830 }
831
832
833
834 /*
835 * print out all elements from list
836 */
837 xmlListWalk(list, (xmlListWalker) xmlC14NPrintNamespaces, (const void *) ctx);
838
839 /*
840 * Cleanup
841 */
842 xmlListDelete(list);
843 return (0);
844 }
845
846
847 /**
848 * xmlC14NAttrsCompare:
849 * @attr1: the pointer tls o first attr
850 * @attr2: the pointer to second attr
851 *
852 * Prints the given attribute to the output buffer from C14N context.
853 *
854 * Returns -1 if attr1 < attr2, 0 if attr1 == attr2 or 1 if attr1 > attr2.
855 */
856 static int
xmlC14NAttrsCompare(xmlAttrPtr attr1,xmlAttrPtr attr2)857 xmlC14NAttrsCompare(xmlAttrPtr attr1, xmlAttrPtr attr2)
858 {
859 int ret = 0;
860
861 /*
862 * Simple cases
863 */
864 if (attr1 == attr2)
865 return (0);
866 if (attr1 == NULL)
867 return (-1);
868 if (attr2 == NULL)
869 return (1);
870 if (attr1->ns == attr2->ns) {
871 return (xmlStrcmp(attr1->name, attr2->name));
872 }
873
874 /*
875 * Attributes in the default namespace are first
876 * because the default namespace is not applied to
877 * unqualified attributes
878 */
879 if (attr1->ns == NULL)
880 return (-1);
881 if (attr2->ns == NULL)
882 return (1);
883 if (attr1->ns->prefix == NULL)
884 return (-1);
885 if (attr2->ns->prefix == NULL)
886 return (1);
887
888 ret = xmlStrcmp(attr1->ns->href, attr2->ns->href);
889 if (ret == 0) {
890 ret = xmlStrcmp(attr1->name, attr2->name);
891 }
892 return (ret);
893 }
894
895
896 /**
897 * xmlC14NPrintAttrs:
898 * @attr: the pointer to attr
899 * @ctx: the C14N context
900 *
901 * Prints out canonical attribute urrent node to the
902 * buffer from C14N context as follows
903 *
904 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
905 *
906 * Returns 1 on success or 0 on fail.
907 */
908 static int
xmlC14NPrintAttrs(const xmlAttrPtr attr,xmlC14NCtxPtr ctx)909 xmlC14NPrintAttrs(const xmlAttrPtr attr, xmlC14NCtxPtr ctx)
910 {
911 xmlChar *value;
912 xmlChar *buffer;
913
914 if ((attr == NULL) || (ctx == NULL)) {
915 xmlC14NErrParam("writing attributes");
916 return (0);
917 }
918
919 xmlOutputBufferWriteString(ctx->buf, " ");
920 if (attr->ns != NULL && xmlStrlen(attr->ns->prefix) > 0) {
921 xmlOutputBufferWriteString(ctx->buf,
922 (const char *) attr->ns->prefix);
923 xmlOutputBufferWriteString(ctx->buf, ":");
924 }
925 xmlOutputBufferWriteString(ctx->buf, (const char *) attr->name);
926 xmlOutputBufferWriteString(ctx->buf, "=\"");
927
928 value = xmlNodeListGetString(attr->doc, attr->children, 1);
929 /* todo: should we log an error if value==NULL ? */
930 if (value != NULL) {
931 buffer = xmlC11NNormalizeAttr(value);
932 xmlFree(value);
933 if (buffer != NULL) {
934 xmlOutputBufferWriteString(ctx->buf, (const char *) buffer);
935 xmlFree(buffer);
936 } else {
937 xmlC14NErrInternal("normalizing attributes axis");
938 return (0);
939 }
940 }
941 xmlOutputBufferWriteString(ctx->buf, "\"");
942 return (1);
943 }
944
945 /**
946 * xmlC14NProcessAttrsAxis:
947 * @ctx: the C14N context
948 * @cur: the current node
949 * @parent_visible: the visibility of parent node
950 *
951 * Prints out canonical attribute axis of the current node to the
952 * buffer from C14N context as follows
953 *
954 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
955 *
956 * Attribute Axis
957 * In lexicographic order (ascending), process each node that
958 * is in the element's attribute axis and in the node-set.
959 *
960 * The processing of an element node E MUST be modified slightly
961 * when an XPath node-set is given as input and the element's
962 * parent is omitted from the node-set.
963 *
964 *
965 * Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
966 *
967 * Canonical XML applied to a document subset requires the search of the
968 * ancestor nodes of each orphan element node for attributes in the xml
969 * namespace, such as xml:lang and xml:space. These are copied into the
970 * element node except if a declaration of the same attribute is already
971 * in the attribute axis of the element (whether or not it is included in
972 * the document subset). This search and copying are omitted from the
973 * Exclusive XML Canonicalization method.
974 *
975 * Returns 0 on success or -1 on fail.
976 */
977 static int
xmlC14NProcessAttrsAxis(xmlC14NCtxPtr ctx,xmlNodePtr cur,int parent_visible)978 xmlC14NProcessAttrsAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int parent_visible)
979 {
980 xmlAttrPtr attr;
981 xmlListPtr list;
982
983 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
984 xmlC14NErrParam("processing attributes axis");
985 return (-1);
986 }
987
988 /*
989 * Create a sorted list to store element attributes
990 */
991 list = xmlListCreate(NULL, (xmlListDataCompare) xmlC14NAttrsCompare);
992 if (list == NULL) {
993 xmlC14NErrInternal("creating attributes list");
994 return (-1);
995 }
996
997 /*
998 * Add all visible attributes from current node.
999 */
1000 attr = cur->properties;
1001 while (attr != NULL) {
1002 /* check that attribute is visible */
1003 if (xmlC14NIsVisible(ctx, attr, cur)) {
1004 xmlListInsert(list, attr);
1005 }
1006 attr = attr->next;
1007 }
1008
1009 /*
1010 * include attributes in "xml" namespace defined in ancestors
1011 * (only for non-exclusive XML Canonicalization)
1012 */
1013 if (parent_visible && (!ctx->exclusive) && (cur->parent != NULL)
1014 && (!xmlC14NIsVisible(ctx, cur->parent, cur->parent->parent))) {
1015 /*
1016 * If XPath node-set is not specified then the parent is always
1017 * visible!
1018 */
1019 cur = cur->parent;
1020 while (cur != NULL) {
1021 attr = cur->properties;
1022 while (attr != NULL) {
1023 if ((attr->ns != NULL)
1024 && (xmlStrEqual(attr->ns->prefix, BAD_CAST "xml"))) {
1025 if (xmlListSearch(list, attr) == NULL) {
1026 xmlListInsert(list, attr);
1027 }
1028 }
1029 attr = attr->next;
1030 }
1031 cur = cur->parent;
1032 }
1033 }
1034
1035 /*
1036 * print out all elements from list
1037 */
1038 xmlListWalk(list, (xmlListWalker) xmlC14NPrintAttrs, (const void *) ctx);
1039
1040 /*
1041 * Cleanup
1042 */
1043 xmlListDelete(list);
1044 return (0);
1045 }
1046
1047 /**
1048 * xmlC14NCheckForRelativeNamespaces:
1049 * @ctx: the C14N context
1050 * @cur: the current element node
1051 *
1052 * Checks that current element node has no relative namespaces defined
1053 *
1054 * Returns 0 if the node has no relative namespaces or -1 otherwise.
1055 */
1056 static int
xmlC14NCheckForRelativeNamespaces(xmlC14NCtxPtr ctx,xmlNodePtr cur)1057 xmlC14NCheckForRelativeNamespaces(xmlC14NCtxPtr ctx, xmlNodePtr cur)
1058 {
1059 xmlNsPtr ns;
1060
1061 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
1062 xmlC14NErrParam("checking for relative namespaces");
1063 return (-1);
1064 }
1065
1066 ns = cur->nsDef;
1067 while (ns != NULL) {
1068 if (xmlStrlen(ns->href) > 0) {
1069 xmlURIPtr uri;
1070
1071 uri = xmlParseURI((const char *) ns->href);
1072 if (uri == NULL) {
1073 xmlC14NErrInternal("parsing namespace uri");
1074 return (-1);
1075 }
1076 if (xmlStrlen((const xmlChar *) uri->scheme) == 0) {
1077 xmlC14NErrRelativeNamespace(uri->scheme);
1078 xmlFreeURI(uri);
1079 return (-1);
1080 }
1081 if ((xmlStrcasecmp((const xmlChar *) uri->scheme, BAD_CAST "urn") != 0)
1082 && (xmlStrcasecmp((const xmlChar *) uri->scheme, BAD_CAST "dav") !=0)
1083 && (xmlStrlen((const xmlChar *) uri->server) == 0)) {
1084 xmlC14NErrRelativeNamespace(uri->scheme);
1085 xmlFreeURI(uri);
1086 return (-1);
1087 }
1088 xmlFreeURI(uri);
1089 }
1090 ns = ns->next;
1091 }
1092 return (0);
1093 }
1094
1095 /**
1096 * xmlC14NProcessElementNode:
1097 * @ctx: the pointer to C14N context object
1098 * @cur: the node to process
1099 *
1100 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
1101 *
1102 * Element Nodes
1103 * If the element is not in the node-set, then the result is obtained
1104 * by processing the namespace axis, then the attribute axis, then
1105 * processing the child nodes of the element that are in the node-set
1106 * (in document order). If the element is in the node-set, then the result
1107 * is an open angle bracket (<), the element QName, the result of
1108 * processing the namespace axis, the result of processing the attribute
1109 * axis, a close angle bracket (>), the result of processing the child
1110 * nodes of the element that are in the node-set (in document order), an
1111 * open angle bracket, a forward slash (/), the element QName, and a close
1112 * angle bracket.
1113 *
1114 * Returns non-negative value on success or negative value on fail
1115 */
1116 static int
xmlC14NProcessElementNode(xmlC14NCtxPtr ctx,xmlNodePtr cur,int visible)1117 xmlC14NProcessElementNode(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
1118 {
1119 int ret;
1120 xmlC14NVisibleNsStack state;
1121 int parent_is_doc = 0;
1122
1123 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
1124 xmlC14NErrParam("processing element node");
1125 return (-1);
1126 }
1127
1128 /*
1129 * Check relative relative namespaces:
1130 * implementations of XML canonicalization MUST report an operation
1131 * failure on documents containing relative namespace URIs.
1132 */
1133 if (xmlC14NCheckForRelativeNamespaces(ctx, cur) < 0) {
1134 xmlC14NErrInternal("checking for relative namespaces");
1135 return (-1);
1136 }
1137
1138
1139 /*
1140 * Save ns_rendered stack position
1141 */
1142 memset(&state, 0, sizeof(state));
1143 xmlC14NVisibleNsStackSave(ctx->ns_rendered, &state);
1144
1145 if (visible) {
1146 if (ctx->parent_is_doc) {
1147 /* save this flag into the stack */
1148 parent_is_doc = ctx->parent_is_doc;
1149 ctx->parent_is_doc = 0;
1150 ctx->pos = XMLC14N_INSIDE_DOCUMENT_ELEMENT;
1151 }
1152 xmlOutputBufferWriteString(ctx->buf, "<");
1153
1154 if ((cur->ns != NULL) && (xmlStrlen(cur->ns->prefix) > 0)) {
1155 xmlOutputBufferWriteString(ctx->buf,
1156 (const char *) cur->ns->prefix);
1157 xmlOutputBufferWriteString(ctx->buf, ":");
1158 }
1159 xmlOutputBufferWriteString(ctx->buf, (const char *) cur->name);
1160 }
1161
1162 if (!ctx->exclusive) {
1163 ret = xmlC14NProcessNamespacesAxis(ctx, cur, visible);
1164 } else {
1165 ret = xmlExcC14NProcessNamespacesAxis(ctx, cur, visible);
1166 }
1167 if (ret < 0) {
1168 xmlC14NErrInternal("processing namespaces axis");
1169 return (-1);
1170 }
1171 /* todo: shouldn't this go to "visible only"? */
1172 if(visible) {
1173 xmlC14NVisibleNsStackShift(ctx->ns_rendered);
1174 }
1175
1176 ret = xmlC14NProcessAttrsAxis(ctx, cur, visible);
1177 if (ret < 0) {
1178 xmlC14NErrInternal("processing attributes axis");
1179 return (-1);
1180 }
1181
1182 if (visible) {
1183 xmlOutputBufferWriteString(ctx->buf, ">");
1184 }
1185 if (cur->children != NULL) {
1186 ret = xmlC14NProcessNodeList(ctx, cur->children);
1187 if (ret < 0) {
1188 xmlC14NErrInternal("processing childrens list");
1189 return (-1);
1190 }
1191 }
1192 if (visible) {
1193 xmlOutputBufferWriteString(ctx->buf, "</");
1194 if ((cur->ns != NULL) && (xmlStrlen(cur->ns->prefix) > 0)) {
1195 xmlOutputBufferWriteString(ctx->buf,
1196 (const char *) cur->ns->prefix);
1197 xmlOutputBufferWriteString(ctx->buf, ":");
1198 }
1199 xmlOutputBufferWriteString(ctx->buf, (const char *) cur->name);
1200 xmlOutputBufferWriteString(ctx->buf, ">");
1201 if (parent_is_doc) {
1202 /* restore this flag from the stack for next node */
1203 ctx->parent_is_doc = parent_is_doc;
1204 ctx->pos = XMLC14N_AFTER_DOCUMENT_ELEMENT;
1205 }
1206 }
1207
1208 /*
1209 * Restore ns_rendered stack position
1210 */
1211 xmlC14NVisibleNsStackRestore(ctx->ns_rendered, &state);
1212 return (0);
1213 }
1214
1215 /**
1216 * xmlC14NProcessNode:
1217 * @ctx: the pointer to C14N context object
1218 * @cur: the node to process
1219 *
1220 * Processes the given node
1221 *
1222 * Returns non-negative value on success or negative value on fail
1223 */
1224 static int
xmlC14NProcessNode(xmlC14NCtxPtr ctx,xmlNodePtr cur)1225 xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur)
1226 {
1227 int ret = 0;
1228 int visible;
1229
1230 if ((ctx == NULL) || (cur == NULL)) {
1231 xmlC14NErrParam("processing node");
1232 return (-1);
1233 }
1234
1235 visible = xmlC14NIsVisible(ctx, cur, cur->parent);
1236 switch (cur->type) {
1237 case XML_ELEMENT_NODE:
1238 ret = xmlC14NProcessElementNode(ctx, cur, visible);
1239 break;
1240 case XML_CDATA_SECTION_NODE:
1241 case XML_TEXT_NODE:
1242 /*
1243 * Text Nodes
1244 * the string value, except all ampersands are replaced
1245 * by &, all open angle brackets (<) are replaced by <, all closing
1246 * angle brackets (>) are replaced by >, and all #xD characters are
1247 * replaced by 
.
1248 */
1249 /* cdata sections are processed as text nodes */
1250 /* todo: verify that cdata sections are included in XPath nodes set */
1251 if ((visible) && (cur->content != NULL)) {
1252 xmlChar *buffer;
1253
1254 buffer = xmlC11NNormalizeText(cur->content);
1255 if (buffer != NULL) {
1256 xmlOutputBufferWriteString(ctx->buf,
1257 (const char *) buffer);
1258 xmlFree(buffer);
1259 } else {
1260 xmlC14NErrInternal("normalizing text node");
1261 return (-1);
1262 }
1263 }
1264 break;
1265 case XML_PI_NODE:
1266 /*
1267 * Processing Instruction (PI) Nodes-
1268 * The opening PI symbol (<?), the PI target name of the node,
1269 * a leading space and the string value if it is not empty, and
1270 * the closing PI symbol (?>). If the string value is empty,
1271 * then the leading space is not added. Also, a trailing #xA is
1272 * rendered after the closing PI symbol for PI children of the
1273 * root node with a lesser document order than the document
1274 * element, and a leading #xA is rendered before the opening PI
1275 * symbol of PI children of the root node with a greater document
1276 * order than the document element.
1277 */
1278 if (visible) {
1279 if (ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
1280 xmlOutputBufferWriteString(ctx->buf, "\x0A<?");
1281 } else {
1282 xmlOutputBufferWriteString(ctx->buf, "<?");
1283 }
1284
1285 xmlOutputBufferWriteString(ctx->buf,
1286 (const char *) cur->name);
1287 if ((cur->content != NULL) && (*(cur->content) != '\0')) {
1288 xmlChar *buffer;
1289
1290 xmlOutputBufferWriteString(ctx->buf, " ");
1291
1292 /* todo: do we need to normalize pi? */
1293 buffer = xmlC11NNormalizePI(cur->content);
1294 if (buffer != NULL) {
1295 xmlOutputBufferWriteString(ctx->buf,
1296 (const char *) buffer);
1297 xmlFree(buffer);
1298 } else {
1299 xmlC14NErrInternal("normalizing pi node");
1300 return (-1);
1301 }
1302 }
1303
1304 if (ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
1305 xmlOutputBufferWriteString(ctx->buf, "?>\x0A");
1306 } else {
1307 xmlOutputBufferWriteString(ctx->buf, "?>");
1308 }
1309 }
1310 break;
1311 case XML_COMMENT_NODE:
1312 /*
1313 * Comment Nodes
1314 * Nothing if generating canonical XML without comments. For
1315 * canonical XML with comments, generate the opening comment
1316 * symbol (<!--), the string value of the node, and the
1317 * closing comment symbol (-->). Also, a trailing #xA is rendered
1318 * after the closing comment symbol for comment children of the
1319 * root node with a lesser document order than the document
1320 * element, and a leading #xA is rendered before the opening
1321 * comment symbol of comment children of the root node with a
1322 * greater document order than the document element. (Comment
1323 * children of the root node represent comments outside of the
1324 * top-level document element and outside of the document type
1325 * declaration).
1326 */
1327 if (visible && ctx->with_comments) {
1328 if (ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
1329 xmlOutputBufferWriteString(ctx->buf, "\x0A<!--");
1330 } else {
1331 xmlOutputBufferWriteString(ctx->buf, "<!--");
1332 }
1333
1334 if (cur->content != NULL) {
1335 xmlChar *buffer;
1336
1337 /* todo: do we need to normalize comment? */
1338 buffer = xmlC11NNormalizeComment(cur->content);
1339 if (buffer != NULL) {
1340 xmlOutputBufferWriteString(ctx->buf,
1341 (const char *) buffer);
1342 xmlFree(buffer);
1343 } else {
1344 xmlC14NErrInternal("normalizing comment node");
1345 return (-1);
1346 }
1347 }
1348
1349 if (ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
1350 xmlOutputBufferWriteString(ctx->buf, "-->\x0A");
1351 } else {
1352 xmlOutputBufferWriteString(ctx->buf, "-->");
1353 }
1354 }
1355 break;
1356 case XML_DOCUMENT_NODE:
1357 case XML_DOCUMENT_FRAG_NODE: /* should be processed as document? */
1358 #ifdef LIBXML_DOCB_ENABLED
1359 case XML_DOCB_DOCUMENT_NODE: /* should be processed as document? */
1360 #endif
1361 #ifdef LIBXML_HTML_ENABLED
1362 case XML_HTML_DOCUMENT_NODE: /* should be processed as document? */
1363 #endif
1364 if (cur->children != NULL) {
1365 ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
1366 ctx->parent_is_doc = 1;
1367 ret = xmlC14NProcessNodeList(ctx, cur->children);
1368 }
1369 break;
1370
1371 case XML_ATTRIBUTE_NODE:
1372 xmlC14NErrInvalidNode("XML_ATTRIBUTE_NODE", "processing node");
1373 return (-1);
1374 case XML_NAMESPACE_DECL:
1375 xmlC14NErrInvalidNode("XML_NAMESPACE_DECL", "processing node");
1376 return (-1);
1377 case XML_ENTITY_REF_NODE:
1378 xmlC14NErrInvalidNode("XML_ENTITY_REF_NODE", "processing node");
1379 return (-1);
1380 case XML_ENTITY_NODE:
1381 xmlC14NErrInvalidNode("XML_ENTITY_NODE", "processing node");
1382 return (-1);
1383
1384 case XML_DOCUMENT_TYPE_NODE:
1385 case XML_NOTATION_NODE:
1386 case XML_DTD_NODE:
1387 case XML_ELEMENT_DECL:
1388 case XML_ATTRIBUTE_DECL:
1389 case XML_ENTITY_DECL:
1390 #ifdef LIBXML_XINCLUDE_ENABLED
1391 case XML_XINCLUDE_START:
1392 case XML_XINCLUDE_END:
1393 #endif
1394 /*
1395 * should be ignored according to "W3C Canonical XML"
1396 */
1397 break;
1398 default:
1399 xmlC14NErrUnknownNode(cur->type, "processing node");
1400 return (-1);
1401 }
1402
1403 return (ret);
1404 }
1405
1406 /**
1407 * xmlC14NProcessNodeList:
1408 * @ctx: the pointer to C14N context object
1409 * @cur: the node to start from
1410 *
1411 * Processes all nodes in the row starting from cur.
1412 *
1413 * Returns non-negative value on success or negative value on fail
1414 */
1415 static int
xmlC14NProcessNodeList(xmlC14NCtxPtr ctx,xmlNodePtr cur)1416 xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur)
1417 {
1418 int ret;
1419
1420 if (ctx == NULL) {
1421 xmlC14NErrParam("processing node list");
1422 return (-1);
1423 }
1424
1425 for (ret = 0; cur != NULL && ret >= 0; cur = cur->next) {
1426 ret = xmlC14NProcessNode(ctx, cur);
1427 }
1428 return (ret);
1429 }
1430
1431
1432 /**
1433 * xmlC14NFreeCtx:
1434 * @ctx: the pointer to C14N context object
1435 *
1436 * Cleanups the C14N context object.
1437 */
1438
1439 static void
xmlC14NFreeCtx(xmlC14NCtxPtr ctx)1440 xmlC14NFreeCtx(xmlC14NCtxPtr ctx)
1441 {
1442 if (ctx == NULL) {
1443 xmlC14NErrParam("freeing context");
1444 return;
1445 }
1446
1447 if (ctx->ns_rendered != NULL) {
1448 xmlC14NVisibleNsStackDestroy(ctx->ns_rendered);
1449 }
1450 xmlFree(ctx);
1451 }
1452
1453 /**
1454 * xmlC14NNewCtx:
1455 * @doc: the XML document for canonization
1456 * @is_visible_callback:the function to use to determine is node visible
1457 * or not
1458 * @user_data: the first parameter for @is_visible_callback function
1459 * (in most cases, it is nodes set)
1460 * @inclusive_ns_prefixe the list of inclusive namespace prefixes
1461 * ended with a NULL or NULL if there is no
1462 * inclusive namespaces (only for exclusive
1463 * canonicalization)
1464 * @with_comments: include comments in the result (!=0) or not (==0)
1465 * @buf: the output buffer to store canonical XML; this
1466 * buffer MUST have encoder==NULL because C14N requires
1467 * UTF-8 output
1468 *
1469 * Creates new C14N context object to store C14N parameters.
1470 *
1471 * Returns pointer to newly created object (success) or NULL (fail)
1472 */
1473 static xmlC14NCtxPtr
xmlC14NNewCtx(xmlDocPtr doc,xmlC14NIsVisibleCallback is_visible_callback,void * user_data,int exclusive,xmlChar ** inclusive_ns_prefixes,int with_comments,xmlOutputBufferPtr buf)1474 xmlC14NNewCtx(xmlDocPtr doc,
1475 xmlC14NIsVisibleCallback is_visible_callback, void* user_data,
1476 int exclusive, xmlChar ** inclusive_ns_prefixes,
1477 int with_comments, xmlOutputBufferPtr buf)
1478 {
1479 xmlC14NCtxPtr ctx = NULL;
1480
1481 if ((doc == NULL) || (buf == NULL)) {
1482 xmlC14NErrParam("creating new context");
1483 return (NULL);
1484 }
1485
1486 /*
1487 * Validate the encoding output buffer encoding
1488 */
1489 if (buf->encoder != NULL) {
1490 xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
1491 "xmlC14NNewCtx: output buffer encoder != NULL but C14N requires UTF8 output\n");
1492 return (NULL);
1493 }
1494
1495 /*
1496 * Validate the XML document encoding value, if provided.
1497 */
1498 if (doc->charset != XML_CHAR_ENCODING_UTF8) {
1499 xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
1500 "xmlC14NNewCtx: source document not in UTF8\n");
1501 return (NULL);
1502 }
1503
1504 /*
1505 * Allocate a new xmlC14NCtxPtr and fill the fields.
1506 */
1507 ctx = (xmlC14NCtxPtr) xmlMalloc(sizeof(xmlC14NCtx));
1508 if (ctx == NULL) {
1509 xmlC14NErrMemory("creating context");
1510 return (NULL);
1511 }
1512 memset(ctx, 0, sizeof(xmlC14NCtx));
1513
1514 /*
1515 * initialize C14N context
1516 */
1517 ctx->doc = doc;
1518 ctx->with_comments = with_comments;
1519 ctx->is_visible_callback = is_visible_callback;
1520 ctx->user_data = user_data;
1521 ctx->buf = buf;
1522 ctx->parent_is_doc = 1;
1523 ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
1524 ctx->ns_rendered = xmlC14NVisibleNsStackCreate();
1525
1526 if(ctx->ns_rendered == NULL) {
1527 xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_CREATE_STACK,
1528 "xmlC14NNewCtx: xmlC14NVisibleNsStackCreate failed\n");
1529 xmlC14NFreeCtx(ctx);
1530 return (NULL);
1531 }
1532
1533 /*
1534 * Set "exclusive" flag, create a nodes set for namespaces
1535 * stack and remember list of incluseve prefixes
1536 */
1537 if (exclusive) {
1538 ctx->exclusive = 1;
1539 ctx->inclusive_ns_prefixes = inclusive_ns_prefixes;
1540 }
1541 return (ctx);
1542 }
1543
1544 /**
1545 * xmlC14NExecute:
1546 * @doc: the XML document for canonization
1547 * @is_visible_callback:the function to use to determine is node visible
1548 * or not
1549 * @user_data: the first parameter for @is_visible_callback function
1550 * (in most cases, it is nodes set)
1551 * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
1552 * otherwise - exclusive canonicalization)
1553 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1554 * ended with a NULL or NULL if there is no
1555 * inclusive namespaces (only for exclusive
1556 * canonicalization, ignored otherwise)
1557 * @with_comments: include comments in the result (!=0) or not (==0)
1558 * @buf: the output buffer to store canonical XML; this
1559 * buffer MUST have encoder==NULL because C14N requires
1560 * UTF-8 output
1561 *
1562 * Dumps the canonized image of given XML document into the provided buffer.
1563 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1564 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
1565 *
1566 * Returns non-negative value on success or a negative value on fail
1567 */
1568 int
xmlC14NExecute(xmlDocPtr doc,xmlC14NIsVisibleCallback is_visible_callback,void * user_data,int exclusive,xmlChar ** inclusive_ns_prefixes,int with_comments,xmlOutputBufferPtr buf)1569 xmlC14NExecute(xmlDocPtr doc, xmlC14NIsVisibleCallback is_visible_callback,
1570 void* user_data, int exclusive, xmlChar **inclusive_ns_prefixes,
1571 int with_comments, xmlOutputBufferPtr buf) {
1572
1573 xmlC14NCtxPtr ctx;
1574 int ret;
1575
1576 if ((buf == NULL) || (doc == NULL)) {
1577 xmlC14NErrParam("executing c14n");
1578 return (-1);
1579 }
1580
1581 /*
1582 * Validate the encoding output buffer encoding
1583 */
1584 if (buf->encoder != NULL) {
1585 xmlC14NErr(NULL, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
1586 "xmlC14NExecute: output buffer encoder != NULL but C14N requires UTF8 output\n");
1587 return (-1);
1588 }
1589
1590 ctx = xmlC14NNewCtx(doc, is_visible_callback, user_data,
1591 exclusive, inclusive_ns_prefixes,
1592 with_comments, buf);
1593 if (ctx == NULL) {
1594 xmlC14NErr(NULL, (xmlNodePtr) doc, XML_C14N_CREATE_CTXT,
1595 "xmlC14NExecute: unable to create C14N context\n");
1596 return (-1);
1597 }
1598
1599
1600
1601 /*
1602 * Root Node
1603 * The root node is the parent of the top-level document element. The
1604 * result of processing each of its child nodes that is in the node-set
1605 * in document order. The root node does not generate a byte order mark,
1606 * XML declaration, nor anything from within the document type
1607 * declaration.
1608 */
1609 if (doc->children != NULL) {
1610 ret = xmlC14NProcessNodeList(ctx, doc->children);
1611 if (ret < 0) {
1612 xmlC14NErrInternal("processing docs children list");
1613 xmlC14NFreeCtx(ctx);
1614 return (-1);
1615 }
1616 }
1617
1618 /*
1619 * Flush buffer to get number of bytes written
1620 */
1621 ret = xmlOutputBufferFlush(buf);
1622 if (ret < 0) {
1623 xmlC14NErrInternal("flushing output buffer");
1624 xmlC14NFreeCtx(ctx);
1625 return (-1);
1626 }
1627
1628 /*
1629 * Cleanup
1630 */
1631 xmlC14NFreeCtx(ctx);
1632 return (ret);
1633 }
1634
1635 /**
1636 * xmlC14NDocSaveTo:
1637 * @doc: the XML document for canonization
1638 * @nodes: the nodes set to be included in the canonized image
1639 * or NULL if all document nodes should be included
1640 * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
1641 * otherwise - exclusive canonicalization)
1642 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1643 * ended with a NULL or NULL if there is no
1644 * inclusive namespaces (only for exclusive
1645 * canonicalization, ignored otherwise)
1646 * @with_comments: include comments in the result (!=0) or not (==0)
1647 * @buf: the output buffer to store canonical XML; this
1648 * buffer MUST have encoder==NULL because C14N requires
1649 * UTF-8 output
1650 *
1651 * Dumps the canonized image of given XML document into the provided buffer.
1652 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1653 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
1654 *
1655 * Returns non-negative value on success or a negative value on fail
1656 */
1657 int
xmlC14NDocSaveTo(xmlDocPtr doc,xmlNodeSetPtr nodes,int exclusive,xmlChar ** inclusive_ns_prefixes,int with_comments,xmlOutputBufferPtr buf)1658 xmlC14NDocSaveTo(xmlDocPtr doc, xmlNodeSetPtr nodes,
1659 int exclusive, xmlChar ** inclusive_ns_prefixes,
1660 int with_comments, xmlOutputBufferPtr buf) {
1661 return(xmlC14NExecute(doc,
1662 (xmlC14NIsVisibleCallback)xmlC14NIsNodeInNodeset,
1663 nodes,
1664 exclusive,
1665 inclusive_ns_prefixes,
1666 with_comments,
1667 buf));
1668 }
1669
1670
1671 /**
1672 * xmlC14NDocDumpMemory:
1673 * @doc: the XML document for canonization
1674 * @nodes: the nodes set to be included in the canonized image
1675 * or NULL if all document nodes should be included
1676 * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
1677 * otherwise - exclusive canonicalization)
1678 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1679 * ended with a NULL or NULL if there is no
1680 * inclusive namespaces (only for exclusive
1681 * canonicalization, ignored otherwise)
1682 * @with_comments: include comments in the result (!=0) or not (==0)
1683 * @doc_txt_ptr: the memory pointer for allocated canonical XML text;
1684 * the caller of this functions is responsible for calling
1685 * xmlFree() to free allocated memory
1686 *
1687 * Dumps the canonized image of given XML document into memory.
1688 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1689 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
1690 *
1691 * Returns the number of bytes written on success or a negative value on fail
1692 */
1693 int
xmlC14NDocDumpMemory(xmlDocPtr doc,xmlNodeSetPtr nodes,int exclusive,xmlChar ** inclusive_ns_prefixes,int with_comments,xmlChar ** doc_txt_ptr)1694 xmlC14NDocDumpMemory(xmlDocPtr doc, xmlNodeSetPtr nodes,
1695 int exclusive, xmlChar ** inclusive_ns_prefixes,
1696 int with_comments, xmlChar ** doc_txt_ptr)
1697 {
1698 int ret;
1699 xmlOutputBufferPtr buf;
1700
1701 if (doc_txt_ptr == NULL) {
1702 xmlC14NErrParam("dumping doc to memory");
1703 return (-1);
1704 }
1705
1706 *doc_txt_ptr = NULL;
1707
1708 /*
1709 * create memory buffer with UTF8 (default) encoding
1710 */
1711 buf = xmlAllocOutputBuffer(NULL);
1712 if (buf == NULL) {
1713 xmlC14NErrMemory("creating output buffer");
1714 return (-1);
1715 }
1716
1717 /*
1718 * canonize document and write to buffer
1719 */
1720 ret = xmlC14NDocSaveTo(doc, nodes, exclusive, inclusive_ns_prefixes,
1721 with_comments, buf);
1722 if (ret < 0) {
1723 xmlC14NErrInternal("saving doc to output buffer");
1724 (void) xmlOutputBufferClose(buf);
1725 return (-1);
1726 }
1727
1728 ret = buf->buffer->use;
1729 if (ret > 0) {
1730 *doc_txt_ptr = xmlStrndup(buf->buffer->content, ret);
1731 }
1732 (void) xmlOutputBufferClose(buf);
1733
1734 if ((*doc_txt_ptr == NULL) && (ret > 0)) {
1735 xmlC14NErrMemory("coping canonicanized document");
1736 return (-1);
1737 }
1738 return (ret);
1739 }
1740
1741 /**
1742 * xmlC14NDocSave:
1743 * @doc: the XML document for canonization
1744 * @nodes: the nodes set to be included in the canonized image
1745 * or NULL if all document nodes should be included
1746 * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
1747 * otherwise - exclusive canonicalization)
1748 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1749 * ended with a NULL or NULL if there is no
1750 * inclusive namespaces (only for exclusive
1751 * canonicalization, ignored otherwise)
1752 * @with_comments: include comments in the result (!=0) or not (==0)
1753 * @filename: the filename to store canonical XML image
1754 * @compression: the compression level (zlib requred):
1755 * -1 - libxml default,
1756 * 0 - uncompressed,
1757 * >0 - compression level
1758 *
1759 * Dumps the canonized image of given XML document into the file.
1760 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1761 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
1762 *
1763 * Returns the number of bytes written success or a negative value on fail
1764 */
1765 int
xmlC14NDocSave(xmlDocPtr doc,xmlNodeSetPtr nodes,int exclusive,xmlChar ** inclusive_ns_prefixes,int with_comments,const char * filename,int compression)1766 xmlC14NDocSave(xmlDocPtr doc, xmlNodeSetPtr nodes,
1767 int exclusive, xmlChar ** inclusive_ns_prefixes,
1768 int with_comments, const char *filename, int compression)
1769 {
1770 xmlOutputBufferPtr buf;
1771 int ret;
1772
1773 if (filename == NULL) {
1774 xmlC14NErrParam("saving doc");
1775 return (-1);
1776 }
1777 #ifdef HAVE_ZLIB_H
1778 if (compression < 0)
1779 compression = xmlGetCompressMode();
1780 #endif
1781
1782 /*
1783 * save the content to a temp buffer, use default UTF8 encoding.
1784 */
1785 buf = xmlOutputBufferCreateFilename(filename, NULL, compression);
1786 if (buf == NULL) {
1787 xmlC14NErrInternal("creating temporary filename");
1788 return (-1);
1789 }
1790
1791 /*
1792 * canonize document and write to buffer
1793 */
1794 ret = xmlC14NDocSaveTo(doc, nodes, exclusive, inclusive_ns_prefixes,
1795 with_comments, buf);
1796 if (ret < 0) {
1797 xmlC14NErrInternal("cannicanize document to buffer");
1798 (void) xmlOutputBufferClose(buf);
1799 return (-1);
1800 }
1801
1802 /*
1803 * get the numbers of bytes written
1804 */
1805 ret = xmlOutputBufferClose(buf);
1806 return (ret);
1807 }
1808
1809
1810
1811 /*
1812 * Macro used to grow the current buffer.
1813 */
1814 #define growBufferReentrant() { \
1815 buffer_size *= 2; \
1816 buffer = (xmlChar *) \
1817 xmlRealloc(buffer, buffer_size * sizeof(xmlChar)); \
1818 if (buffer == NULL) { \
1819 xmlC14NErrMemory("growing buffer"); \
1820 return(NULL); \
1821 } \
1822 }
1823
1824 /**
1825 * xmlC11NNormalizeString:
1826 * @input: the input string
1827 * @mode: the normalization mode (attribute, comment, PI or text)
1828 *
1829 * Converts a string to a canonical (normalized) format. The code is stolen
1830 * from xmlEncodeEntitiesReentrant(). Added normalization of \x09, \x0a, \x0A
1831 * and the @mode parameter
1832 *
1833 * Returns a normalized string (caller is responsible for calling xmlFree())
1834 * or NULL if an error occurs
1835 */
1836 static xmlChar *
xmlC11NNormalizeString(const xmlChar * input,xmlC14NNormalizationMode mode)1837 xmlC11NNormalizeString(const xmlChar * input,
1838 xmlC14NNormalizationMode mode)
1839 {
1840 const xmlChar *cur = input;
1841 xmlChar *buffer = NULL;
1842 xmlChar *out = NULL;
1843 int buffer_size = 0;
1844
1845 if (input == NULL)
1846 return (NULL);
1847
1848 /*
1849 * allocate an translation buffer.
1850 */
1851 buffer_size = 1000;
1852 buffer = (xmlChar *) xmlMallocAtomic(buffer_size * sizeof(xmlChar));
1853 if (buffer == NULL) {
1854 xmlC14NErrMemory("allocating buffer");
1855 return (NULL);
1856 }
1857 out = buffer;
1858
1859 while (*cur != '\0') {
1860 if ((out - buffer) > (buffer_size - 10)) {
1861 int indx = out - buffer;
1862
1863 growBufferReentrant();
1864 out = &buffer[indx];
1865 }
1866
1867 if ((*cur == '<') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
1868 (mode == XMLC14N_NORMALIZE_TEXT))) {
1869 *out++ = '&';
1870 *out++ = 'l';
1871 *out++ = 't';
1872 *out++ = ';';
1873 } else if ((*cur == '>') && (mode == XMLC14N_NORMALIZE_TEXT)) {
1874 *out++ = '&';
1875 *out++ = 'g';
1876 *out++ = 't';
1877 *out++ = ';';
1878 } else if ((*cur == '&') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
1879 (mode == XMLC14N_NORMALIZE_TEXT))) {
1880 *out++ = '&';
1881 *out++ = 'a';
1882 *out++ = 'm';
1883 *out++ = 'p';
1884 *out++ = ';';
1885 } else if ((*cur == '"') && (mode == XMLC14N_NORMALIZE_ATTR)) {
1886 *out++ = '&';
1887 *out++ = 'q';
1888 *out++ = 'u';
1889 *out++ = 'o';
1890 *out++ = 't';
1891 *out++ = ';';
1892 } else if ((*cur == '\x09') && (mode == XMLC14N_NORMALIZE_ATTR)) {
1893 *out++ = '&';
1894 *out++ = '#';
1895 *out++ = 'x';
1896 *out++ = '9';
1897 *out++ = ';';
1898 } else if ((*cur == '\x0A') && (mode == XMLC14N_NORMALIZE_ATTR)) {
1899 *out++ = '&';
1900 *out++ = '#';
1901 *out++ = 'x';
1902 *out++ = 'A';
1903 *out++ = ';';
1904 } else if ((*cur == '\x0D') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
1905 (mode == XMLC14N_NORMALIZE_TEXT) ||
1906 (mode == XMLC14N_NORMALIZE_COMMENT) ||
1907 (mode == XMLC14N_NORMALIZE_PI))) {
1908 *out++ = '&';
1909 *out++ = '#';
1910 *out++ = 'x';
1911 *out++ = 'D';
1912 *out++ = ';';
1913 } else {
1914 /*
1915 * Works because on UTF-8, all extended sequences cannot
1916 * result in bytes in the ASCII range.
1917 */
1918 *out++ = *cur;
1919 }
1920 cur++;
1921 }
1922 *out++ = 0;
1923 return (buffer);
1924 }
1925 #endif /* LIBXML_OUTPUT_ENABLED */
1926 #define bottom_c14n
1927 #include "elfgcchack.h"
1928 #endif /* LIBXML_C14N_ENABLED */
1929