2 * "Canonical XML" implementation
3 * http://www.w3.org/TR/xml-c14n
5 * "Exclusive XML Canonicalization" implementation
6 * http://www.w3.org/TR/xml-exc-c14n
8 * See Copyright for the status of this software.
10 * Author: Aleksey Sanin <aleksey@aleksey.com>
14 #ifdef LIBXML_C14N_ENABLED
15 #ifdef LIBXML_OUTPUT_ENABLED
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>
32 /************************************************************************
34 * Some declaration better left private ATM *
36 ************************************************************************/
39 XMLC14N_BEFORE_DOCUMENT_ELEMENT = 0,
40 XMLC14N_INSIDE_DOCUMENT_ELEMENT = 1,
41 XMLC14N_AFTER_DOCUMENT_ELEMENT = 2
44 typedef struct _xmlC14NVisibleNsStack {
45 int nsCurEnd; /* number of nodes in the set */
46 int nsPrevStart; /* the begginning of the stack for previous visible node */
47 int nsPrevEnd; /* the end of the stack for previous visible node */
48 int nsMax; /* size of the array as allocated */
49 xmlNsPtr *nsTab; /* array of ns in no particular order */
50 xmlNodePtr *nodeTab; /* array of nodes in no particular order */
51 } xmlC14NVisibleNsStack, *xmlC14NVisibleNsStackPtr;
53 typedef struct _xmlC14NCtx {
54 /* input parameters */
56 xmlC14NIsVisibleCallback is_visible_callback;
59 xmlOutputBufferPtr buf;
61 /* position in the XML document */
64 xmlC14NVisibleNsStackPtr ns_rendered;
69 /* exclusive canonicalization */
70 xmlChar **inclusive_ns_prefixes;
74 } xmlC14NCtx, *xmlC14NCtxPtr;
76 static xmlC14NVisibleNsStackPtr xmlC14NVisibleNsStackCreate (void);
77 static void xmlC14NVisibleNsStackDestroy (xmlC14NVisibleNsStackPtr cur);
78 static void xmlC14NVisibleNsStackAdd (xmlC14NVisibleNsStackPtr cur,
81 static void xmlC14NVisibleNsStackSave (xmlC14NVisibleNsStackPtr cur,
82 xmlC14NVisibleNsStackPtr state);
83 static void xmlC14NVisibleNsStackRestore (xmlC14NVisibleNsStackPtr cur,
84 xmlC14NVisibleNsStackPtr state);
85 static void xmlC14NVisibleNsStackShift (xmlC14NVisibleNsStackPtr cur);
86 static int xmlC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
88 static int xmlExcC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
92 static int xmlC14NIsNodeInNodeset (xmlNodeSetPtr nodes,
98 static int xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur);
99 static int xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur);
101 XMLC14N_NORMALIZE_ATTR = 0,
102 XMLC14N_NORMALIZE_COMMENT = 1,
103 XMLC14N_NORMALIZE_PI = 2,
104 XMLC14N_NORMALIZE_TEXT = 3
105 } xmlC14NNormalizationMode;
107 static xmlChar *xmlC11NNormalizeString(const xmlChar * input,
108 xmlC14NNormalizationMode mode);
110 #define xmlC11NNormalizeAttr( a ) \
111 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_ATTR)
112 #define xmlC11NNormalizeComment( a ) \
113 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_COMMENT)
114 #define xmlC11NNormalizePI( a ) \
115 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_PI)
116 #define xmlC11NNormalizeText( a ) \
117 xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_TEXT)
119 #define xmlC14NIsVisible( ctx, node, parent ) \
120 (((ctx)->is_visible_callback != NULL) ? \
121 (ctx)->is_visible_callback((ctx)->user_data, \
122 (xmlNodePtr)(node), (xmlNodePtr)(parent)) : 1)
124 #define xmlC14NIsExclusive( ctx ) \
125 ( (ctx)->mode == XML_C14N_EXCLUSIVE_1_0 )
127 /************************************************************************
129 * Some factorized error routines *
131 ************************************************************************/
135 * @extra: extra informations
137 * Handle a redefinition of memory error
140 xmlC14NErrMemory(const char *extra)
142 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
143 XML_ERR_NO_MEMORY, XML_ERR_ERROR, NULL, 0, extra,
145 "Memory allocation failed : %s\n", extra);
150 * @extra: extra informations
152 * Handle a redefinition of param error
155 xmlC14NErrParam(const char *extra)
157 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
158 XML_ERR_INTERNAL_ERROR, XML_ERR_ERROR, NULL, 0, extra,
160 "Invalid parameter : %s\n", extra);
164 * xmlC14NErrInternal:
165 * @extra: extra informations
167 * Handle a redefinition of internal error
170 xmlC14NErrInternal(const char *extra)
172 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
173 XML_ERR_INTERNAL_ERROR, XML_ERR_ERROR, NULL, 0, extra,
175 "Internal error : %s\n", extra);
179 * xmlC14NErrInvalidNode:
180 * @extra: extra informations
182 * Handle a redefinition of invalid node error
185 xmlC14NErrInvalidNode(const char *node_type, const char *extra)
187 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
188 XML_C14N_INVALID_NODE, XML_ERR_ERROR, NULL, 0, extra,
190 "Node %s is invalid here : %s\n", node_type, extra);
194 * xmlC14NErrUnknownNode:
195 * @extra: extra informations
197 * Handle a redefinition of unknown node error
200 xmlC14NErrUnknownNode(int node_type, const char *extra)
202 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
203 XML_C14N_UNKNOW_NODE, XML_ERR_ERROR, NULL, 0, extra,
205 "Unknown node type %d found : %s\n", node_type, extra);
209 * xmlC14NErrRelativeNamespace:
210 * @extra: extra informations
212 * Handle a redefinition of relative namespace error
215 xmlC14NErrRelativeNamespace(const char *ns_uri)
217 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
218 XML_C14N_RELATIVE_NAMESPACE, XML_ERR_ERROR, NULL, 0, NULL,
220 "Relative namespace UR is invalid here : %s\n", ns_uri);
227 * @ctxt: a C14N evaluation context
228 * @node: the context node
229 * @error: the erorr code
231 * @extra: extra informations
233 * Handle a redefinition of attribute error
236 xmlC14NErr(xmlC14NCtxPtr ctxt, xmlNodePtr node, int error,
241 __xmlRaiseError(NULL, NULL, NULL,
242 ctxt, node, XML_FROM_C14N, error,
243 XML_ERR_ERROR, NULL, 0,
244 NULL, NULL, NULL, 0, 0, "%s", msg);
247 /************************************************************************
249 * The implementation internals *
251 ************************************************************************/
252 #define XML_NAMESPACES_DEFAULT 16
255 xmlC14NIsNodeInNodeset(xmlNodeSetPtr nodes, xmlNodePtr node, xmlNodePtr parent) {
256 if((nodes != NULL) && (node != NULL)) {
257 if(node->type != XML_NAMESPACE_DECL) {
258 return(xmlXPathNodeSetContains(nodes, node));
262 memcpy(&ns, node, sizeof(ns));
264 /* this is a libxml hack! check xpath.c for details */
265 if((parent != NULL) && (parent->type == XML_ATTRIBUTE_NODE)) {
266 ns.next = (xmlNsPtr)parent->parent;
268 ns.next = (xmlNsPtr)parent;
272 * If the input is an XPath node-set, then the node-set must explicitly
273 * contain every node to be rendered to the canonical form.
275 return(xmlXPathNodeSetContains(nodes, (xmlNodePtr)&ns));
281 static xmlC14NVisibleNsStackPtr
282 xmlC14NVisibleNsStackCreate(void) {
283 xmlC14NVisibleNsStackPtr ret;
285 ret = (xmlC14NVisibleNsStackPtr) xmlMalloc(sizeof(xmlC14NVisibleNsStack));
287 xmlC14NErrMemory("creating namespaces stack");
290 memset(ret, 0 , (size_t) sizeof(xmlC14NVisibleNsStack));
295 xmlC14NVisibleNsStackDestroy(xmlC14NVisibleNsStackPtr cur) {
297 xmlC14NErrParam("destroying namespaces stack");
300 if(cur->nsTab != NULL) {
301 memset(cur->nsTab, 0, cur->nsMax * sizeof(xmlNsPtr));
304 if(cur->nodeTab != NULL) {
305 memset(cur->nodeTab, 0, cur->nsMax * sizeof(xmlNodePtr));
306 xmlFree(cur->nodeTab);
308 memset(cur, 0, sizeof(xmlC14NVisibleNsStack));
314 xmlC14NVisibleNsStackAdd(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlNodePtr node) {
316 ((cur->nsTab == NULL) && (cur->nodeTab != NULL)) ||
317 ((cur->nsTab != NULL) && (cur->nodeTab == NULL))) {
318 xmlC14NErrParam("adding namespace to stack");
322 if ((cur->nsTab == NULL) && (cur->nodeTab == NULL)) {
323 cur->nsTab = (xmlNsPtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
324 cur->nodeTab = (xmlNodePtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
325 if ((cur->nsTab == NULL) || (cur->nodeTab == NULL)) {
326 xmlC14NErrMemory("adding node to stack");
329 memset(cur->nsTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
330 memset(cur->nodeTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
331 cur->nsMax = XML_NAMESPACES_DEFAULT;
332 } else if(cur->nsMax == cur->nsCurEnd) {
336 tmpSize = 2 * cur->nsMax;
337 tmp = xmlRealloc(cur->nsTab, tmpSize * sizeof(xmlNsPtr));
339 xmlC14NErrMemory("adding node to stack");
342 cur->nsTab = (xmlNsPtr*)tmp;
344 tmp = xmlRealloc(cur->nodeTab, tmpSize * sizeof(xmlNodePtr));
346 xmlC14NErrMemory("adding node to stack");
349 cur->nodeTab = (xmlNodePtr*)tmp;
351 cur->nsMax = tmpSize;
353 cur->nsTab[cur->nsCurEnd] = ns;
354 cur->nodeTab[cur->nsCurEnd] = node;
360 xmlC14NVisibleNsStackSave(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
361 if((cur == NULL) || (state == NULL)) {
362 xmlC14NErrParam("saving namespaces stack");
366 state->nsCurEnd = cur->nsCurEnd;
367 state->nsPrevStart = cur->nsPrevStart;
368 state->nsPrevEnd = cur->nsPrevEnd;
372 xmlC14NVisibleNsStackRestore(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
373 if((cur == NULL) || (state == NULL)) {
374 xmlC14NErrParam("restoring namespaces stack");
377 cur->nsCurEnd = state->nsCurEnd;
378 cur->nsPrevStart = state->nsPrevStart;
379 cur->nsPrevEnd = state->nsPrevEnd;
383 xmlC14NVisibleNsStackShift(xmlC14NVisibleNsStackPtr cur) {
385 xmlC14NErrParam("shifting namespaces stack");
388 cur->nsPrevStart = cur->nsPrevEnd;
389 cur->nsPrevEnd = cur->nsCurEnd;
393 xmlC14NStrEqual(const xmlChar *str1, const xmlChar *str2) {
394 if (str1 == str2) return(1);
395 if (str1 == NULL) return((*str2) == '\0');
396 if (str2 == NULL) return((*str1) == '\0');
398 if (*str1++ != *str2) return(0);
404 * xmlC14NVisibleNsStackFind:
405 * @ctx: the C14N context
406 * @ns: the namespace to check
408 * Checks whether the given namespace was already rendered or not
410 * Returns 1 if we already wrote this namespace or 0 otherwise
413 xmlC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns)
416 const xmlChar *prefix;
421 xmlC14NErrParam("searching namespaces stack (c14n)");
426 * if the default namespace xmlns="" is not defined yet then
427 * we do not want to print it out
429 prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
430 href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
431 has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
433 if (cur->nsTab != NULL) {
434 int start = (has_empty_ns) ? 0 : cur->nsPrevStart;
435 for (i = cur->nsCurEnd - 1; i >= start; --i) {
436 xmlNsPtr ns1 = cur->nsTab[i];
438 if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
439 return(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL));
443 return(has_empty_ns);
447 xmlExcC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlC14NCtxPtr ctx) {
449 const xmlChar *prefix;
454 xmlC14NErrParam("searching namespaces stack (exc c14n)");
459 * if the default namespace xmlns="" is not defined yet then
460 * we do not want to print it out
462 prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
463 href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
464 has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
466 if (cur->nsTab != NULL) {
468 for (i = cur->nsCurEnd - 1; i >= start; --i) {
469 xmlNsPtr ns1 = cur->nsTab[i];
471 if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
472 if(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL)) {
473 return(xmlC14NIsVisible(ctx, ns1, cur->nodeTab[i]));
480 return(has_empty_ns);
488 * @ns: the namespace to check
490 * Checks whether the given namespace is a default "xml:" namespace
491 * with href="http://www.w3.org/XML/1998/namespace"
493 * Returns 1 if the node is default or 0 otherwise
496 /* todo: make it a define? */
498 xmlC14NIsXmlNs(xmlNsPtr ns)
500 return ((ns != NULL) &&
501 (xmlStrEqual(ns->prefix, BAD_CAST "xml")) &&
502 (xmlStrEqual(ns->href, XML_XML_NAMESPACE)));
508 * @ns1: the pointer to first namespace
509 * @ns2: the pointer to second namespace
511 * Compares the namespaces by names (prefixes).
513 * Returns -1 if ns1 < ns2, 0 if ns1 == ns2 or 1 if ns1 > ns2.
516 xmlC14NNsCompare(xmlNsPtr ns1, xmlNsPtr ns2)
525 return (xmlStrcmp(ns1->prefix, ns2->prefix));
530 * xmlC14NPrintNamespaces:
531 * @ns: the pointer to namespace
532 * @ctx: the C14N context
534 * Prints the given namespace to the output buffer from C14N context.
536 * Returns 1 on success or 0 on fail.
539 xmlC14NPrintNamespaces(const xmlNsPtr ns, xmlC14NCtxPtr ctx)
542 if ((ns == NULL) || (ctx == NULL)) {
543 xmlC14NErrParam("writing namespaces");
547 if (ns->prefix != NULL) {
548 xmlOutputBufferWriteString(ctx->buf, " xmlns:");
549 xmlOutputBufferWriteString(ctx->buf, (const char *) ns->prefix);
550 xmlOutputBufferWriteString(ctx->buf, "=\"");
552 xmlOutputBufferWriteString(ctx->buf, " xmlns=\"");
554 if(ns->href != NULL) {
555 xmlOutputBufferWriteString(ctx->buf, (const char *) ns->href);
557 xmlOutputBufferWriteString(ctx->buf, "\"");
562 * xmlC14NProcessNamespacesAxis:
563 * @ctx: the C14N context
564 * @node: the current node
566 * Prints out canonical namespace axis of the current node to the
567 * buffer from C14N context as follows
569 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
572 * Consider a list L containing only namespace nodes in the
573 * axis and in the node-set in lexicographic order (ascending). To begin
574 * processing L, if the first node is not the default namespace node (a node
575 * with no namespace URI and no local name), then generate a space followed
576 * by xmlns="" if and only if the following conditions are met:
577 * - the element E that owns the axis is in the node-set
578 * - The nearest ancestor element of E in the node-set has a default
579 * namespace node in the node-set (default namespace nodes always
580 * have non-empty values in XPath)
581 * The latter condition eliminates unnecessary occurrences of xmlns="" in
582 * the canonical form since an element only receives an xmlns="" if its
583 * default namespace is empty and if it has an immediate parent in the
584 * canonical form that has a non-empty default namespace. To finish
585 * processing L, simply process every namespace node in L, except omit
586 * namespace node with local name xml, which defines the xml prefix,
587 * if its string value is http://www.w3.org/XML/1998/namespace.
589 * Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
590 * Canonical XML applied to a document subset requires the search of the
591 * ancestor nodes of each orphan element node for attributes in the xml
592 * namespace, such as xml:lang and xml:space. These are copied into the
593 * element node except if a declaration of the same attribute is already
594 * in the attribute axis of the element (whether or not it is included in
595 * the document subset). This search and copying are omitted from the
596 * Exclusive XML Canonicalization method.
598 * Returns 0 on success or -1 on fail.
601 xmlC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
606 int already_rendered;
607 int has_empty_ns = 0;
609 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
610 xmlC14NErrParam("processing namespaces axis (c14n)");
615 * Create a sorted list to store element namespaces
617 list = xmlListCreate(NULL, (xmlListDataCompare) xmlC14NNsCompare);
619 xmlC14NErrInternal("creating namespaces list (c14n)");
623 /* check all namespaces */
624 for(n = cur; n != NULL; n = n->parent) {
625 for(ns = n->nsDef; ns != NULL; ns = ns->next) {
626 tmp = xmlSearchNs(cur->doc, cur, ns->prefix);
628 if((tmp == ns) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
629 already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
631 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
633 if(!already_rendered) {
634 xmlListInsert(list, ns);
636 if(xmlStrlen(ns->prefix) == 0) {
644 * if the first node is not the default namespace node (a node with no
645 * namespace URI and no local name), then generate a space followed by
646 * xmlns="" if and only if the following conditions are met:
647 * - the element E that owns the axis is in the node-set
648 * - the nearest ancestor element of E in the node-set has a default
649 * namespace node in the node-set (default namespace nodes always
650 * have non-empty values in XPath)
652 if(visible && !has_empty_ns) {
653 static xmlNs ns_default;
655 memset(&ns_default, 0, sizeof(ns_default));
656 if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
657 xmlC14NPrintNamespaces(&ns_default, ctx);
663 * print out all elements from list
665 xmlListWalk(list, (xmlListWalker) xmlC14NPrintNamespaces, (const void *) ctx);
676 * xmlExcC14NProcessNamespacesAxis:
677 * @ctx: the C14N context
678 * @node: the current node
680 * Prints out exclusive canonical namespace axis of the current node to the
681 * buffer from C14N context as follows
683 * Exclusive XML Canonicalization
684 * http://www.w3.org/TR/xml-exc-c14n
686 * If the element node is in the XPath subset then output the node in
687 * accordance with Canonical XML except for namespace nodes which are
688 * rendered as follows:
690 * 1. Render each namespace node iff:
691 * * it is visibly utilized by the immediate parent element or one of
692 * its attributes, or is present in InclusiveNamespaces PrefixList, and
693 * * its prefix and value do not appear in ns_rendered. ns_rendered is
694 * obtained by popping the state stack in order to obtain a list of
695 * prefixes and their values which have already been rendered by
696 * an output ancestor of the namespace node's parent element.
697 * 2. Append the rendered namespace node to the list ns_rendered of namespace
698 * nodes rendered by output ancestors. Push ns_rendered on state stack and
700 * 3. After the recursion returns, pop thestate stack.
703 * Returns 0 on success or -1 on fail.
706 xmlExcC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
711 int already_rendered;
712 int has_empty_ns = 0;
713 int has_visibly_utilized_empty_ns = 0;
714 int has_empty_ns_in_inclusive_list = 0;
716 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
717 xmlC14NErrParam("processing namespaces axis (exc c14n)");
721 if(!xmlC14NIsExclusive(ctx)) {
722 xmlC14NErrParam("processing namespaces axis (exc c14n)");
728 * Create a sorted list to store element namespaces
730 list = xmlListCreate(NULL, (xmlListDataCompare) xmlC14NNsCompare);
732 xmlC14NErrInternal("creating namespaces list (exc c14n)");
737 * process inclusive namespaces:
738 * All namespace nodes appearing on inclusive ns list are
739 * handled as provided in Canonical XML
741 if(ctx->inclusive_ns_prefixes != NULL) {
745 for (i = 0; ctx->inclusive_ns_prefixes[i] != NULL; ++i) {
746 prefix = ctx->inclusive_ns_prefixes[i];
748 * Special values for namespace with empty prefix
750 if (xmlStrEqual(prefix, BAD_CAST "#default")
751 || xmlStrEqual(prefix, BAD_CAST "")) {
753 has_empty_ns_in_inclusive_list = 1;
756 ns = xmlSearchNs(cur->doc, cur, prefix);
757 if((ns != NULL) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
758 already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
760 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
762 if(!already_rendered) {
763 xmlListInsert(list, ns);
765 if(xmlStrlen(ns->prefix) == 0) {
772 /* add node namespace */
773 if(cur->ns != NULL) {
776 ns = xmlSearchNs(cur->doc, cur, NULL);
777 has_visibly_utilized_empty_ns = 1;
779 if((ns != NULL) && !xmlC14NIsXmlNs(ns)) {
780 if(visible && xmlC14NIsVisible(ctx, ns, cur)) {
781 if(!xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, ns, ctx)) {
782 xmlListInsert(list, ns);
786 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
788 if(xmlStrlen(ns->prefix) == 0) {
795 for(attr = cur->properties; attr != NULL; attr = attr->next) {
797 * we need to check that attribute is visible and has non
798 * default namespace (XML Namespaces: "default namespaces
799 * do not apply directly to attributes")
801 if((attr->ns != NULL) && !xmlC14NIsXmlNs(attr->ns) && xmlC14NIsVisible(ctx, attr, cur)) {
802 already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, attr->ns, ctx);
803 xmlC14NVisibleNsStackAdd(ctx->ns_rendered, attr->ns, cur);
804 if(!already_rendered && visible) {
805 xmlListInsert(list, attr->ns);
807 if(xmlStrlen(attr->ns->prefix) == 0) {
810 } else if((attr->ns != NULL) && (xmlStrlen(attr->ns->prefix) == 0) && (xmlStrlen(attr->ns->href) == 0)) {
811 has_visibly_utilized_empty_ns = 1;
818 if(visible && has_visibly_utilized_empty_ns &&
819 !has_empty_ns && !has_empty_ns_in_inclusive_list) {
820 static xmlNs ns_default;
822 memset(&ns_default, 0, sizeof(ns_default));
824 already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default, ctx);
825 if(!already_rendered) {
826 xmlC14NPrintNamespaces(&ns_default, ctx);
828 } else if(visible && !has_empty_ns && has_empty_ns_in_inclusive_list) {
829 static xmlNs ns_default;
831 memset(&ns_default, 0, sizeof(ns_default));
832 if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
833 xmlC14NPrintNamespaces(&ns_default, ctx);
840 * print out all elements from list
842 xmlListWalk(list, (xmlListWalker) xmlC14NPrintNamespaces, (const void *) ctx);
854 * @attr: the attr to check
856 * Checks whether the given attribute is a default "xml:" namespace
857 * with href="http://www.w3.org/XML/1998/namespace"
859 * Returns 1 if the node is default or 0 otherwise
862 /* todo: make it a define? */
864 xmlC14NIsXmlAttr(xmlAttrPtr attr)
866 return ((attr->ns != NULL) &&
867 (xmlC14NIsXmlNs(attr->ns) != 0));
872 * xmlC14NAttrsCompare:
873 * @attr1: the pointer tls o first attr
874 * @attr2: the pointer to second attr
876 * Prints the given attribute to the output buffer from C14N context.
878 * Returns -1 if attr1 < attr2, 0 if attr1 == attr2 or 1 if attr1 > attr2.
881 xmlC14NAttrsCompare(xmlAttrPtr attr1, xmlAttrPtr attr2)
894 if (attr1->ns == attr2->ns) {
895 return (xmlStrcmp(attr1->name, attr2->name));
899 * Attributes in the default namespace are first
900 * because the default namespace is not applied to
901 * unqualified attributes
903 if (attr1->ns == NULL)
905 if (attr2->ns == NULL)
907 if (attr1->ns->prefix == NULL)
909 if (attr2->ns->prefix == NULL)
912 ret = xmlStrcmp(attr1->ns->href, attr2->ns->href);
914 ret = xmlStrcmp(attr1->name, attr2->name);
922 * @attr: the pointer to attr
923 * @ctx: the C14N context
925 * Prints out canonical attribute urrent node to the
926 * buffer from C14N context as follows
928 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
930 * Returns 1 on success or 0 on fail.
933 xmlC14NPrintAttrs(const xmlAttrPtr attr, xmlC14NCtxPtr ctx)
938 if ((attr == NULL) || (ctx == NULL)) {
939 xmlC14NErrParam("writing attributes");
943 xmlOutputBufferWriteString(ctx->buf, " ");
944 if (attr->ns != NULL && xmlStrlen(attr->ns->prefix) > 0) {
945 xmlOutputBufferWriteString(ctx->buf,
946 (const char *) attr->ns->prefix);
947 xmlOutputBufferWriteString(ctx->buf, ":");
949 xmlOutputBufferWriteString(ctx->buf, (const char *) attr->name);
950 xmlOutputBufferWriteString(ctx->buf, "=\"");
952 value = xmlNodeListGetString(ctx->doc, attr->children, 1);
953 /* todo: should we log an error if value==NULL ? */
955 buffer = xmlC11NNormalizeAttr(value);
957 if (buffer != NULL) {
958 xmlOutputBufferWriteString(ctx->buf, (const char *) buffer);
961 xmlC14NErrInternal("normalizing attributes axis");
965 xmlOutputBufferWriteString(ctx->buf, "\"");
970 * xmlC14NFindHiddenParentAttr:
972 * Finds an attribute in a hidden parent node.
974 * Returns a pointer to the attribute node (if found) or NULL otherwise.
977 xmlC14NFindHiddenParentAttr(xmlC14NCtxPtr ctx, xmlNodePtr cur, const xmlChar * name, const xmlChar * ns)
980 while((cur != NULL) && (!xmlC14NIsVisible(ctx, cur, cur->parent))) {
981 res = xmlHasNsProp(cur, name, ns);
993 * xmlC14NFixupBaseAttr:
995 * Fixes up the xml:base attribute
997 * Returns the newly created attribute or NULL
1000 xmlC14NFixupBaseAttr(xmlC14NCtxPtr ctx, xmlAttrPtr xml_base_attr)
1002 xmlChar * res = NULL;
1009 if ((ctx == NULL) || (xml_base_attr == NULL) || (xml_base_attr->parent == NULL)) {
1010 xmlC14NErrParam("processing xml:base attribute");
1014 /* start from current value */
1015 res = xmlNodeListGetString(ctx->doc, xml_base_attr->children, 1);
1017 xmlC14NErrInternal("processing xml:base attribute - can't get attr value");
1021 /* go up the stack until we find a node that we rendered already */
1022 cur = xml_base_attr->parent->parent;
1023 while((cur != NULL) && (!xmlC14NIsVisible(ctx, cur, cur->parent))) {
1024 attr = xmlHasNsProp(cur, BAD_CAST "base", XML_XML_NAMESPACE);
1026 /* get attr value */
1027 tmp_str = xmlNodeListGetString(ctx->doc, attr->children, 1);
1028 if(tmp_str == NULL) {
1031 xmlC14NErrInternal("processing xml:base attribute - can't get attr value");
1035 /* we need to add '/' if our current base uri ends with '..' or '.'
1036 to ensure that we are forced to go "up" all the time */
1037 tmp_str_len = xmlStrlen(tmp_str);
1038 if(tmp_str_len > 1 && tmp_str[tmp_str_len - 2] == '.') {
1039 tmp_str2 = xmlStrcat(tmp_str, BAD_CAST "/");
1040 if(tmp_str2 == NULL) {
1044 xmlC14NErrInternal("processing xml:base attribute - can't modify uri");
1052 tmp_str2 = xmlBuildURI(res, tmp_str);
1053 if(tmp_str2 == NULL) {
1057 xmlC14NErrInternal("processing xml:base attribute - can't construct uri");
1061 /* cleanup and set the new res */
1071 /* check if result uri is empty or not */
1072 if((res == NULL) || xmlStrEqual(res, BAD_CAST "")) {
1077 /* create and return the new attribute node */
1078 attr = xmlNewNsProp(NULL, xml_base_attr->ns, BAD_CAST "base", res);
1082 xmlC14NErrInternal("processing xml:base attribute - can't construct attribute");
1092 * xmlC14NProcessAttrsAxis:
1093 * @ctx: the C14N context
1094 * @cur: the current node
1095 * @parent_visible: the visibility of parent node
1096 * @all_parents_visible: the visibility of all parent nodes
1098 * Prints out canonical attribute axis of the current node to the
1099 * buffer from C14N context as follows
1101 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
1104 * In lexicographic order (ascending), process each node that
1105 * is in the element's attribute axis and in the node-set.
1107 * The processing of an element node E MUST be modified slightly
1108 * when an XPath node-set is given as input and the element's
1109 * parent is omitted from the node-set.
1112 * Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
1114 * Canonical XML applied to a document subset requires the search of the
1115 * ancestor nodes of each orphan element node for attributes in the xml
1116 * namespace, such as xml:lang and xml:space. These are copied into the
1117 * element node except if a declaration of the same attribute is already
1118 * in the attribute axis of the element (whether or not it is included in
1119 * the document subset). This search and copying are omitted from the
1120 * Exclusive XML Canonicalization method.
1122 * Returns 0 on success or -1 on fail.
1125 xmlC14NProcessAttrsAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int parent_visible)
1129 xmlAttrPtr attrs_to_delete = NULL;
1131 /* special processing for 1.1 spec */
1132 xmlAttrPtr xml_base_attr = NULL;
1133 xmlAttrPtr xml_lang_attr = NULL;
1134 xmlAttrPtr xml_space_attr = NULL;
1136 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
1137 xmlC14NErrParam("processing attributes axis");
1142 * Create a sorted list to store element attributes
1144 list = xmlListCreate(NULL, (xmlListDataCompare) xmlC14NAttrsCompare);
1146 xmlC14NErrInternal("creating attributes list");
1152 /* The processing of an element node E MUST be modified slightly when an XPath node-set is
1153 * given as input and the element's parent is omitted from the node-set. The method for processing
1154 * the attribute axis of an element E in the node-set is enhanced. All element nodes along E's
1155 * ancestor axis are examined for nearest occurrences of attributes in the xml namespace, such
1156 * as xml:lang and xml:space (whether or not they are in the node-set). From this list of attributes,
1157 * remove any that are in E's attribute axis (whether or not they are in the node-set). Then,
1158 * lexicographically merge this attribute list with the nodes of E's attribute axis that are in
1159 * the node-set. The result of visiting the attribute axis is computed by processing the attribute
1160 * nodes in this merged attribute list.
1164 * Add all visible attributes from current node.
1166 attr = cur->properties;
1167 while (attr != NULL) {
1168 /* check that attribute is visible */
1169 if (xmlC14NIsVisible(ctx, attr, cur)) {
1170 xmlListInsert(list, attr);
1176 * Handle xml attributes
1178 if (parent_visible && (cur->parent != NULL) &&
1179 (!xmlC14NIsVisible(ctx, cur->parent, cur->parent->parent)))
1184 * If XPath node-set is not specified then the parent is always
1188 while (tmp != NULL) {
1189 attr = tmp->properties;
1190 while (attr != NULL) {
1191 if (xmlC14NIsXmlAttr(attr) != 0) {
1192 if (xmlListSearch(list, attr) == NULL) {
1193 xmlListInsert(list, attr);
1204 case XML_C14N_EXCLUSIVE_1_0:
1205 /* attributes in the XML namespace, such as xml:lang and xml:space
1206 * are not imported into orphan nodes of the document subset
1210 * Add all visible attributes from current node.
1212 attr = cur->properties;
1213 while (attr != NULL) {
1214 /* check that attribute is visible */
1215 if (xmlC14NIsVisible(ctx, attr, cur)) {
1216 xmlListInsert(list, attr);
1221 /* do nothing special for xml attributes */
1224 /* The processing of an element node E MUST be modified slightly when an XPath node-set is
1225 * given as input and some of the element's ancestors are omitted from the node-set.
1227 * Simple inheritable attributes are attributes that have a value that requires at most a simple
1228 * redeclaration. This redeclaration is done by supplying a new value in the child axis. The
1229 * redeclaration of a simple inheritable attribute A contained in one of E's ancestors is done
1230 * by supplying a value to an attribute Ae inside E with the same name. Simple inheritable attributes
1231 * are xml:lang and xml:space.
1233 * The method for processing the attribute axis of an element E in the node-set is hence enhanced.
1234 * All element nodes along E's ancestor axis are examined for the nearest occurrences of simple
1235 * inheritable attributes in the xml namespace, such as xml:lang and xml:space (whether or not they
1236 * are in the node-set). From this list of attributes, any simple inheritable attributes that are
1237 * already in E's attribute axis (whether or not they are in the node-set) are removed. Then,
1238 * lexicographically merge this attribute list with the nodes of E's attribute axis that are in
1239 * the node-set. The result of visiting the attribute axis is computed by processing the attribute
1240 * nodes in this merged attribute list.
1242 * The xml:id attribute is not a simple inheritable attribute and no processing of these attributes is
1245 * The xml:base attribute is not a simple inheritable attribute and requires special processing beyond
1246 * a simple redeclaration.
1248 * Attributes in the XML namespace other than xml:base, xml:id, xml:lang, and xml:space MUST be processed
1249 * as ordinary attributes.
1253 * Add all visible attributes from current node.
1255 attr = cur->properties;
1256 while (attr != NULL) {
1257 /* special processing for XML attribute kiks in only when we have invisible parents */
1258 if ((!parent_visible) || (xmlC14NIsXmlAttr(attr) == 0)) {
1259 /* check that attribute is visible */
1260 if (xmlC14NIsVisible(ctx, attr, cur)) {
1261 xmlListInsert(list, attr);
1266 /* check for simple inheritance attributes */
1267 if((!matched) && (xml_lang_attr == NULL) && xmlStrEqual(attr->name, BAD_CAST "lang")) {
1268 xml_lang_attr = attr;
1271 if((!matched) && (xml_space_attr == NULL) && xmlStrEqual(attr->name, BAD_CAST "space")) {
1272 xml_space_attr = attr;
1276 /* check for base attr */
1277 if((!matched) && (xml_base_attr == NULL) && xmlStrEqual(attr->name, BAD_CAST "base")) {
1278 xml_base_attr = attr;
1282 /* otherwise, it is a normal attribute, so just check if it is visible */
1283 if((!matched) && xmlC14NIsVisible(ctx, attr, cur)) {
1284 xmlListInsert(list, attr);
1288 /* move to the next one */
1292 /* special processing for XML attribute kiks in only when we have invisible parents */
1293 if ((parent_visible)) {
1295 /* simple inheritance attributes - copy */
1296 if(xml_lang_attr == NULL) {
1297 xml_lang_attr = xmlC14NFindHiddenParentAttr(ctx, cur->parent, BAD_CAST "lang", XML_XML_NAMESPACE);
1299 if(xml_lang_attr != NULL) {
1300 xmlListInsert(list, xml_lang_attr);
1302 if(xml_space_attr == NULL) {
1303 xml_space_attr = xmlC14NFindHiddenParentAttr(ctx, cur->parent, BAD_CAST "space", XML_XML_NAMESPACE);
1305 if(xml_space_attr != NULL) {
1306 xmlListInsert(list, xml_space_attr);
1309 /* base uri attribute - fix up */
1310 if(xml_base_attr == NULL) {
1311 /* if we don't have base uri attribute, check if we have a "hidden" one above */
1312 xml_base_attr = xmlC14NFindHiddenParentAttr(ctx, cur->parent, BAD_CAST "base", XML_XML_NAMESPACE);
1314 if(xml_base_attr != NULL) {
1315 xml_base_attr = xmlC14NFixupBaseAttr(ctx, xml_base_attr);
1316 if(xml_base_attr != NULL) {
1317 xmlListInsert(list, xml_base_attr);
1319 /* note that we MUST delete returned attr node ourselves! */
1320 xml_base_attr->next = attrs_to_delete;
1321 attrs_to_delete = xml_base_attr;
1331 * print out all elements from list
1333 xmlListWalk(list, (xmlListWalker) xmlC14NPrintAttrs, (const void *) ctx);
1338 xmlFreePropList(attrs_to_delete);
1339 xmlListDelete(list);
1344 * xmlC14NCheckForRelativeNamespaces:
1345 * @ctx: the C14N context
1346 * @cur: the current element node
1348 * Checks that current element node has no relative namespaces defined
1350 * Returns 0 if the node has no relative namespaces or -1 otherwise.
1353 xmlC14NCheckForRelativeNamespaces(xmlC14NCtxPtr ctx, xmlNodePtr cur)
1357 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
1358 xmlC14NErrParam("checking for relative namespaces");
1363 while (ns != NULL) {
1364 if (xmlStrlen(ns->href) > 0) {
1367 uri = xmlParseURI((const char *) ns->href);
1369 xmlC14NErrInternal("parsing namespace uri");
1372 if (xmlStrlen((const xmlChar *) uri->scheme) == 0) {
1373 xmlC14NErrRelativeNamespace(uri->scheme);
1377 if ((xmlStrcasecmp((const xmlChar *) uri->scheme, BAD_CAST "urn") != 0)
1378 && (xmlStrcasecmp((const xmlChar *) uri->scheme, BAD_CAST "dav") !=0)
1379 && (xmlStrlen((const xmlChar *) uri->server) == 0)) {
1380 xmlC14NErrRelativeNamespace(uri->scheme);
1392 * xmlC14NProcessElementNode:
1393 * @ctx: the pointer to C14N context object
1394 * @cur: the node to process
1395 * @visible: this node is visible
1396 * @all_parents_visible: whether all the parents of this node are visible
1398 * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
1401 * If the element is not in the node-set, then the result is obtained
1402 * by processing the namespace axis, then the attribute axis, then
1403 * processing the child nodes of the element that are in the node-set
1404 * (in document order). If the element is in the node-set, then the result
1405 * is an open angle bracket (<), the element QName, the result of
1406 * processing the namespace axis, the result of processing the attribute
1407 * axis, a close angle bracket (>), the result of processing the child
1408 * nodes of the element that are in the node-set (in document order), an
1409 * open angle bracket, a forward slash (/), the element QName, and a close
1412 * Returns non-negative value on success or negative value on fail
1415 xmlC14NProcessElementNode(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
1418 xmlC14NVisibleNsStack state;
1419 int parent_is_doc = 0;
1421 if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
1422 xmlC14NErrParam("processing element node");
1427 * Check relative relative namespaces:
1428 * implementations of XML canonicalization MUST report an operation
1429 * failure on documents containing relative namespace URIs.
1431 if (xmlC14NCheckForRelativeNamespaces(ctx, cur) < 0) {
1432 xmlC14NErrInternal("checking for relative namespaces");
1438 * Save ns_rendered stack position
1440 memset(&state, 0, sizeof(state));
1441 xmlC14NVisibleNsStackSave(ctx->ns_rendered, &state);
1444 if (ctx->parent_is_doc) {
1445 /* save this flag into the stack */
1446 parent_is_doc = ctx->parent_is_doc;
1447 ctx->parent_is_doc = 0;
1448 ctx->pos = XMLC14N_INSIDE_DOCUMENT_ELEMENT;
1450 xmlOutputBufferWriteString(ctx->buf, "<");
1452 if ((cur->ns != NULL) && (xmlStrlen(cur->ns->prefix) > 0)) {
1453 xmlOutputBufferWriteString(ctx->buf,
1454 (const char *) cur->ns->prefix);
1455 xmlOutputBufferWriteString(ctx->buf, ":");
1457 xmlOutputBufferWriteString(ctx->buf, (const char *) cur->name);
1460 if (!xmlC14NIsExclusive(ctx)) {
1461 ret = xmlC14NProcessNamespacesAxis(ctx, cur, visible);
1463 ret = xmlExcC14NProcessNamespacesAxis(ctx, cur, visible);
1466 xmlC14NErrInternal("processing namespaces axis");
1469 /* todo: shouldn't this go to "visible only"? */
1471 xmlC14NVisibleNsStackShift(ctx->ns_rendered);
1474 ret = xmlC14NProcessAttrsAxis(ctx, cur, visible);
1476 xmlC14NErrInternal("processing attributes axis");
1481 xmlOutputBufferWriteString(ctx->buf, ">");
1483 if (cur->children != NULL) {
1484 ret = xmlC14NProcessNodeList(ctx, cur->children);
1486 xmlC14NErrInternal("processing childrens list");
1491 xmlOutputBufferWriteString(ctx->buf, "</");
1492 if ((cur->ns != NULL) && (xmlStrlen(cur->ns->prefix) > 0)) {
1493 xmlOutputBufferWriteString(ctx->buf,
1494 (const char *) cur->ns->prefix);
1495 xmlOutputBufferWriteString(ctx->buf, ":");
1497 xmlOutputBufferWriteString(ctx->buf, (const char *) cur->name);
1498 xmlOutputBufferWriteString(ctx->buf, ">");
1499 if (parent_is_doc) {
1500 /* restore this flag from the stack for next node */
1501 ctx->parent_is_doc = parent_is_doc;
1502 ctx->pos = XMLC14N_AFTER_DOCUMENT_ELEMENT;
1507 * Restore ns_rendered stack position
1509 xmlC14NVisibleNsStackRestore(ctx->ns_rendered, &state);
1514 * xmlC14NProcessNode:
1515 * @ctx: the pointer to C14N context object
1516 * @cur: the node to process
1518 * Processes the given node
1520 * Returns non-negative value on success or negative value on fail
1523 xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur)
1528 if ((ctx == NULL) || (cur == NULL)) {
1529 xmlC14NErrParam("processing node");
1533 visible = xmlC14NIsVisible(ctx, cur, cur->parent);
1534 switch (cur->type) {
1535 case XML_ELEMENT_NODE:
1536 ret = xmlC14NProcessElementNode(ctx, cur, visible);
1538 case XML_CDATA_SECTION_NODE:
1542 * the string value, except all ampersands are replaced
1543 * by &, all open angle brackets (<) are replaced by <, all closing
1544 * angle brackets (>) are replaced by >, and all #xD characters are
1545 * replaced by 
.
1547 /* cdata sections are processed as text nodes */
1548 /* todo: verify that cdata sections are included in XPath nodes set */
1549 if ((visible) && (cur->content != NULL)) {
1552 buffer = xmlC11NNormalizeText(cur->content);
1553 if (buffer != NULL) {
1554 xmlOutputBufferWriteString(ctx->buf,
1555 (const char *) buffer);
1558 xmlC14NErrInternal("normalizing text node");
1565 * Processing Instruction (PI) Nodes-
1566 * The opening PI symbol (<?), the PI target name of the node,
1567 * a leading space and the string value if it is not empty, and
1568 * the closing PI symbol (?>). If the string value is empty,
1569 * then the leading space is not added. Also, a trailing #xA is
1570 * rendered after the closing PI symbol for PI children of the
1571 * root node with a lesser document order than the document
1572 * element, and a leading #xA is rendered before the opening PI
1573 * symbol of PI children of the root node with a greater document
1574 * order than the document element.
1577 if (ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
1578 xmlOutputBufferWriteString(ctx->buf, "\x0A<?");
1580 xmlOutputBufferWriteString(ctx->buf, "<?");
1583 xmlOutputBufferWriteString(ctx->buf,
1584 (const char *) cur->name);
1585 if ((cur->content != NULL) && (*(cur->content) != '\0')) {
1588 xmlOutputBufferWriteString(ctx->buf, " ");
1590 /* todo: do we need to normalize pi? */
1591 buffer = xmlC11NNormalizePI(cur->content);
1592 if (buffer != NULL) {
1593 xmlOutputBufferWriteString(ctx->buf,
1594 (const char *) buffer);
1597 xmlC14NErrInternal("normalizing pi node");
1602 if (ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
1603 xmlOutputBufferWriteString(ctx->buf, "?>\x0A");
1605 xmlOutputBufferWriteString(ctx->buf, "?>");
1609 case XML_COMMENT_NODE:
1612 * Nothing if generating canonical XML without comments. For
1613 * canonical XML with comments, generate the opening comment
1614 * symbol (<!--), the string value of the node, and the
1615 * closing comment symbol (-->). Also, a trailing #xA is rendered
1616 * after the closing comment symbol for comment children of the
1617 * root node with a lesser document order than the document
1618 * element, and a leading #xA is rendered before the opening
1619 * comment symbol of comment children of the root node with a
1620 * greater document order than the document element. (Comment
1621 * children of the root node represent comments outside of the
1622 * top-level document element and outside of the document type
1625 if (visible && ctx->with_comments) {
1626 if (ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
1627 xmlOutputBufferWriteString(ctx->buf, "\x0A<!--");
1629 xmlOutputBufferWriteString(ctx->buf, "<!--");
1632 if (cur->content != NULL) {
1635 /* todo: do we need to normalize comment? */
1636 buffer = xmlC11NNormalizeComment(cur->content);
1637 if (buffer != NULL) {
1638 xmlOutputBufferWriteString(ctx->buf,
1639 (const char *) buffer);
1642 xmlC14NErrInternal("normalizing comment node");
1647 if (ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
1648 xmlOutputBufferWriteString(ctx->buf, "-->\x0A");
1650 xmlOutputBufferWriteString(ctx->buf, "-->");
1654 case XML_DOCUMENT_NODE:
1655 case XML_DOCUMENT_FRAG_NODE: /* should be processed as document? */
1656 #ifdef LIBXML_DOCB_ENABLED
1657 case XML_DOCB_DOCUMENT_NODE: /* should be processed as document? */
1659 #ifdef LIBXML_HTML_ENABLED
1660 case XML_HTML_DOCUMENT_NODE: /* should be processed as document? */
1662 if (cur->children != NULL) {
1663 ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
1664 ctx->parent_is_doc = 1;
1665 ret = xmlC14NProcessNodeList(ctx, cur->children);
1669 case XML_ATTRIBUTE_NODE:
1670 xmlC14NErrInvalidNode("XML_ATTRIBUTE_NODE", "processing node");
1672 case XML_NAMESPACE_DECL:
1673 xmlC14NErrInvalidNode("XML_NAMESPACE_DECL", "processing node");
1675 case XML_ENTITY_REF_NODE:
1676 xmlC14NErrInvalidNode("XML_ENTITY_REF_NODE", "processing node");
1678 case XML_ENTITY_NODE:
1679 xmlC14NErrInvalidNode("XML_ENTITY_NODE", "processing node");
1682 case XML_DOCUMENT_TYPE_NODE:
1683 case XML_NOTATION_NODE:
1685 case XML_ELEMENT_DECL:
1686 case XML_ATTRIBUTE_DECL:
1687 case XML_ENTITY_DECL:
1688 #ifdef LIBXML_XINCLUDE_ENABLED
1689 case XML_XINCLUDE_START:
1690 case XML_XINCLUDE_END:
1693 * should be ignored according to "W3C Canonical XML"
1697 xmlC14NErrUnknownNode(cur->type, "processing node");
1705 * xmlC14NProcessNodeList:
1706 * @ctx: the pointer to C14N context object
1707 * @cur: the node to start from
1709 * Processes all nodes in the row starting from cur.
1711 * Returns non-negative value on success or negative value on fail
1714 xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur)
1719 xmlC14NErrParam("processing node list");
1723 for (ret = 0; cur != NULL && ret >= 0; cur = cur->next) {
1724 ret = xmlC14NProcessNode(ctx, cur);
1732 * @ctx: the pointer to C14N context object
1734 * Cleanups the C14N context object.
1738 xmlC14NFreeCtx(xmlC14NCtxPtr ctx)
1741 xmlC14NErrParam("freeing context");
1745 if (ctx->ns_rendered != NULL) {
1746 xmlC14NVisibleNsStackDestroy(ctx->ns_rendered);
1753 * @doc: the XML document for canonization
1754 * @is_visible_callback:the function to use to determine is node visible
1756 * @user_data: the first parameter for @is_visible_callback function
1757 * (in most cases, it is nodes set)
1758 * @mode: the c14n mode (see @xmlC14NMode)
1759 * @inclusive_ns_prefixe the list of inclusive namespace prefixes
1760 * ended with a NULL or NULL if there is no
1761 * inclusive namespaces (only for `
1763 * @with_comments: include comments in the result (!=0) or not (==0)
1764 * @buf: the output buffer to store canonical XML; this
1765 * buffer MUST have encoder==NULL because C14N requires
1768 * Creates new C14N context object to store C14N parameters.
1770 * Returns pointer to newly created object (success) or NULL (fail)
1772 static xmlC14NCtxPtr
1773 xmlC14NNewCtx(xmlDocPtr doc,
1774 xmlC14NIsVisibleCallback is_visible_callback, void* user_data,
1775 xmlC14NMode mode, xmlChar ** inclusive_ns_prefixes,
1776 int with_comments, xmlOutputBufferPtr buf)
1778 xmlC14NCtxPtr ctx = NULL;
1780 if ((doc == NULL) || (buf == NULL)) {
1781 xmlC14NErrParam("creating new context");
1786 * Validate the encoding output buffer encoding
1788 if (buf->encoder != NULL) {
1789 xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
1790 "xmlC14NNewCtx: output buffer encoder != NULL but C14N requires UTF8 output\n");
1795 * Validate the XML document encoding value, if provided.
1797 if (doc->charset != XML_CHAR_ENCODING_UTF8) {
1798 xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
1799 "xmlC14NNewCtx: source document not in UTF8\n");
1804 * Allocate a new xmlC14NCtxPtr and fill the fields.
1806 ctx = (xmlC14NCtxPtr) xmlMalloc(sizeof(xmlC14NCtx));
1808 xmlC14NErrMemory("creating context");
1811 memset(ctx, 0, sizeof(xmlC14NCtx));
1814 * initialize C14N context
1817 ctx->with_comments = with_comments;
1818 ctx->is_visible_callback = is_visible_callback;
1819 ctx->user_data = user_data;
1821 ctx->parent_is_doc = 1;
1822 ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
1823 ctx->ns_rendered = xmlC14NVisibleNsStackCreate();
1825 if(ctx->ns_rendered == NULL) {
1826 xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_CREATE_STACK,
1827 "xmlC14NNewCtx: xmlC14NVisibleNsStackCreate failed\n");
1828 xmlC14NFreeCtx(ctx);
1833 * Set "mode" flag and remember list of incluseve prefixes
1834 * for exclusive c14n
1837 if(xmlC14NIsExclusive(ctx)) {
1838 ctx->inclusive_ns_prefixes = inclusive_ns_prefixes;
1845 * @doc: the XML document for canonization
1846 * @is_visible_callback:the function to use to determine is node visible
1848 * @user_data: the first parameter for @is_visible_callback function
1849 * (in most cases, it is nodes set)
1850 * @mode: the c14n mode (see @xmlC14NMode)
1851 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1852 * ended with a NULL or NULL if there is no
1853 * inclusive namespaces (only for exclusive
1854 * canonicalization, ignored otherwise)
1855 * @with_comments: include comments in the result (!=0) or not (==0)
1856 * @buf: the output buffer to store canonical XML; this
1857 * buffer MUST have encoder==NULL because C14N requires
1860 * Dumps the canonized image of given XML document into the provided buffer.
1861 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1862 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
1864 * Returns non-negative value on success or a negative value on fail
1867 xmlC14NExecute(xmlDocPtr doc, xmlC14NIsVisibleCallback is_visible_callback,
1868 void* user_data, int mode, xmlChar **inclusive_ns_prefixes,
1869 int with_comments, xmlOutputBufferPtr buf) {
1872 xmlC14NMode c14n_mode = XML_C14N_1_0;
1875 if ((buf == NULL) || (doc == NULL)) {
1876 xmlC14NErrParam("executing c14n");
1880 /* for backward compatibility, we have to have "mode" as "int"
1881 and here we check that user gives valid value */
1884 case XML_C14N_EXCLUSIVE_1_0:
1886 c14n_mode = (xmlC14NMode)mode;
1889 xmlC14NErrParam("invalid mode for executing c14n");
1894 * Validate the encoding output buffer encoding
1896 if (buf->encoder != NULL) {
1897 xmlC14NErr(NULL, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
1898 "xmlC14NExecute: output buffer encoder != NULL but C14N requires UTF8 output\n");
1902 ctx = xmlC14NNewCtx(doc, is_visible_callback, user_data,
1903 c14n_mode, inclusive_ns_prefixes,
1904 with_comments, buf);
1906 xmlC14NErr(NULL, (xmlNodePtr) doc, XML_C14N_CREATE_CTXT,
1907 "xmlC14NExecute: unable to create C14N context\n");
1915 * The root node is the parent of the top-level document element. The
1916 * result of processing each of its child nodes that is in the node-set
1917 * in document order. The root node does not generate a byte order mark,
1918 * XML declaration, nor anything from within the document type
1921 if (doc->children != NULL) {
1922 ret = xmlC14NProcessNodeList(ctx, doc->children);
1924 xmlC14NErrInternal("processing docs children list");
1925 xmlC14NFreeCtx(ctx);
1931 * Flush buffer to get number of bytes written
1933 ret = xmlOutputBufferFlush(buf);
1935 xmlC14NErrInternal("flushing output buffer");
1936 xmlC14NFreeCtx(ctx);
1943 xmlC14NFreeCtx(ctx);
1949 * @doc: the XML document for canonization
1950 * @nodes: the nodes set to be included in the canonized image
1951 * or NULL if all document nodes should be included
1952 * @mode: the c14n mode (see @xmlC14NMode)
1953 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1954 * ended with a NULL or NULL if there is no
1955 * inclusive namespaces (only for exclusive
1956 * canonicalization, ignored otherwise)
1957 * @with_comments: include comments in the result (!=0) or not (==0)
1958 * @buf: the output buffer to store canonical XML; this
1959 * buffer MUST have encoder==NULL because C14N requires
1962 * Dumps the canonized image of given XML document into the provided buffer.
1963 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1964 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
1966 * Returns non-negative value on success or a negative value on fail
1969 xmlC14NDocSaveTo(xmlDocPtr doc, xmlNodeSetPtr nodes,
1970 int mode, xmlChar ** inclusive_ns_prefixes,
1971 int with_comments, xmlOutputBufferPtr buf) {
1972 return(xmlC14NExecute(doc,
1973 (xmlC14NIsVisibleCallback)xmlC14NIsNodeInNodeset,
1976 inclusive_ns_prefixes,
1983 * xmlC14NDocDumpMemory:
1984 * @doc: the XML document for canonization
1985 * @nodes: the nodes set to be included in the canonized image
1986 * or NULL if all document nodes should be included
1987 * @mode: the c14n mode (see @xmlC14NMode)
1988 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
1989 * ended with a NULL or NULL if there is no
1990 * inclusive namespaces (only for exclusive
1991 * canonicalization, ignored otherwise)
1992 * @with_comments: include comments in the result (!=0) or not (==0)
1993 * @doc_txt_ptr: the memory pointer for allocated canonical XML text;
1994 * the caller of this functions is responsible for calling
1995 * xmlFree() to free allocated memory
1997 * Dumps the canonized image of given XML document into memory.
1998 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
1999 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
2001 * Returns the number of bytes written on success or a negative value on fail
2004 xmlC14NDocDumpMemory(xmlDocPtr doc, xmlNodeSetPtr nodes,
2005 int mode, xmlChar ** inclusive_ns_prefixes,
2006 int with_comments, xmlChar ** doc_txt_ptr)
2009 xmlOutputBufferPtr buf;
2011 if (doc_txt_ptr == NULL) {
2012 xmlC14NErrParam("dumping doc to memory");
2016 *doc_txt_ptr = NULL;
2019 * create memory buffer with UTF8 (default) encoding
2021 buf = xmlAllocOutputBuffer(NULL);
2023 xmlC14NErrMemory("creating output buffer");
2028 * canonize document and write to buffer
2030 ret = xmlC14NDocSaveTo(doc, nodes, mode, inclusive_ns_prefixes,
2031 with_comments, buf);
2033 xmlC14NErrInternal("saving doc to output buffer");
2034 (void) xmlOutputBufferClose(buf);
2038 ret = xmlBufUse(buf->buffer);
2040 *doc_txt_ptr = xmlStrndup(xmlBufContent(buf->buffer), ret);
2042 (void) xmlOutputBufferClose(buf);
2044 if ((*doc_txt_ptr == NULL) && (ret > 0)) {
2045 xmlC14NErrMemory("coping canonicanized document");
2053 * @doc: the XML document for canonization
2054 * @nodes: the nodes set to be included in the canonized image
2055 * or NULL if all document nodes should be included
2056 * @mode: the c14n mode (see @xmlC14NMode)
2057 * @inclusive_ns_prefixes: the list of inclusive namespace prefixes
2058 * ended with a NULL or NULL if there is no
2059 * inclusive namespaces (only for exclusive
2060 * canonicalization, ignored otherwise)
2061 * @with_comments: include comments in the result (!=0) or not (==0)
2062 * @filename: the filename to store canonical XML image
2063 * @compression: the compression level (zlib requred):
2064 * -1 - libxml default,
2066 * >0 - compression level
2068 * Dumps the canonized image of given XML document into the file.
2069 * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
2070 * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
2072 * Returns the number of bytes written success or a negative value on fail
2075 xmlC14NDocSave(xmlDocPtr doc, xmlNodeSetPtr nodes,
2076 int mode, xmlChar ** inclusive_ns_prefixes,
2077 int with_comments, const char *filename, int compression)
2079 xmlOutputBufferPtr buf;
2082 if (filename == NULL) {
2083 xmlC14NErrParam("saving doc");
2087 if (compression < 0)
2088 compression = xmlGetCompressMode();
2092 * save the content to a temp buffer, use default UTF8 encoding.
2094 buf = xmlOutputBufferCreateFilename(filename, NULL, compression);
2096 xmlC14NErrInternal("creating temporary filename");
2101 * canonize document and write to buffer
2103 ret = xmlC14NDocSaveTo(doc, nodes, mode, inclusive_ns_prefixes,
2104 with_comments, buf);
2106 xmlC14NErrInternal("cannicanize document to buffer");
2107 (void) xmlOutputBufferClose(buf);
2112 * get the numbers of bytes written
2114 ret = xmlOutputBufferClose(buf);
2121 * Macro used to grow the current buffer.
2123 #define growBufferReentrant() { \
2125 buffer = (xmlChar *) \
2126 xmlRealloc(buffer, buffer_size * sizeof(xmlChar)); \
2127 if (buffer == NULL) { \
2128 xmlC14NErrMemory("growing buffer"); \
2134 * xmlC11NNormalizeString:
2135 * @input: the input string
2136 * @mode: the normalization mode (attribute, comment, PI or text)
2138 * Converts a string to a canonical (normalized) format. The code is stolen
2139 * from xmlEncodeEntitiesReentrant(). Added normalization of \x09, \x0a, \x0A
2140 * and the @mode parameter
2142 * Returns a normalized string (caller is responsible for calling xmlFree())
2143 * or NULL if an error occurs
2146 xmlC11NNormalizeString(const xmlChar * input,
2147 xmlC14NNormalizationMode mode)
2149 const xmlChar *cur = input;
2150 xmlChar *buffer = NULL;
2151 xmlChar *out = NULL;
2152 int buffer_size = 0;
2158 * allocate an translation buffer.
2161 buffer = (xmlChar *) xmlMallocAtomic(buffer_size * sizeof(xmlChar));
2162 if (buffer == NULL) {
2163 xmlC14NErrMemory("allocating buffer");
2168 while (*cur != '\0') {
2169 if ((out - buffer) > (buffer_size - 10)) {
2170 int indx = out - buffer;
2172 growBufferReentrant();
2173 out = &buffer[indx];
2176 if ((*cur == '<') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
2177 (mode == XMLC14N_NORMALIZE_TEXT))) {
2182 } else if ((*cur == '>') && (mode == XMLC14N_NORMALIZE_TEXT)) {
2187 } else if ((*cur == '&') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
2188 (mode == XMLC14N_NORMALIZE_TEXT))) {
2194 } else if ((*cur == '"') && (mode == XMLC14N_NORMALIZE_ATTR)) {
2201 } else if ((*cur == '\x09') && (mode == XMLC14N_NORMALIZE_ATTR)) {
2207 } else if ((*cur == '\x0A') && (mode == XMLC14N_NORMALIZE_ATTR)) {
2213 } else if ((*cur == '\x0D') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
2214 (mode == XMLC14N_NORMALIZE_TEXT) ||
2215 (mode == XMLC14N_NORMALIZE_COMMENT) ||
2216 (mode == XMLC14N_NORMALIZE_PI))) {
2224 * Works because on UTF-8, all extended sequences cannot
2225 * result in bytes in the ASCII range.
2234 #endif /* LIBXML_OUTPUT_ENABLED */
2236 #include "elfgcchack.h"
2237 #endif /* LIBXML_C14N_ENABLED */