fixing #61290 "namespace nodes have no parent" long standing divergence
* xpath.c: fixing #61290 "namespace nodes have no parent"
long standing divergence from the XPath REC. NodeSets
simply hold a copy of namespace nodes and those node ->next
points to the parent (which may not be the node carrying the
definition).
* include/libxml/xpath.h: flagged but didn't added a possible
speedup
* DOCBparser.c HTMLparser.c: removed some warnings from push
parser due to new state being added.
* tree.c: new fix from Boris Erdmann
* configure.in c14n.c include/libxml/c14n.h testC14N.c: added
the XML Canonalization support from Aleksey Sanin
Daniel
diff --git a/c14n.c b/c14n.c
new file mode 100644
index 0000000..1db73fc
--- /dev/null
+++ b/c14n.c
@@ -0,0 +1,1556 @@
+/*
+ * "Canonical XML" implementation
+ * http://www.w3.org/TR/xml-c14n
+ *
+ * "Exclusive XML Canonicalization" implementation
+ * http://www.w3.org/TR/xml-exc-c14n
+ *
+ * See Copyright for the status of this software.
+ *
+ * Author: Aleksey Sanin <aleksey@aleksey.com>
+ */
+#include "libxml.h"
+#ifdef LIBXML_C14N_ENABLED
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#include <string.h>
+
+#include <libxml/tree.h>
+#include <libxml/parser.h>
+#include <libxml/uri.h>
+#include <libxml/xmlerror.h>
+#include <libxml/globals.h>
+#include <libxml/xpathInternals.h>
+#include <libxml/c14n.h>
+
+/************************************************************************
+ * *
+ * Some declaration better left private ATM *
+ * *
+ ************************************************************************/
+
+typedef enum {
+ XMLC14N_BEFORE_DOCUMENT_ELEMENT= 0,
+ XMLC14N_INSIDE_DOCUMENT_ELEMENT= 1,
+ XMLC14N_AFTER_DOCUMENT_ELEMENT= 2
+} xmlC14NPosition;
+
+typedef struct _xmlC14NCtx {
+ /* input parameters */
+ xmlDocPtr doc;
+ xmlNodeSetPtr visible_nodes;
+ int with_comments;
+ xmlOutputBufferPtr buf;
+
+ /* position in the XML document */
+ xmlC14NPosition pos;
+ int parent_is_doc;
+
+ /* exclusive canonicalization */
+ int exclusive;
+ xmlNodeSetPtr ns_rendered;
+ xmlChar **inclusive_ns_prefixes;
+} xmlC14NCtx, *xmlC14NCtxPtr;
+
+
+static int xmlC14NProcessNode (xmlC14NCtxPtr ctx,
+ xmlNodePtr cur);
+static int xmlC14NProcessNodeList (xmlC14NCtxPtr ctx,
+ xmlNodePtr cur);
+typedef enum {
+ XMLC14N_NORMALIZE_ATTR= 0,
+ XMLC14N_NORMALIZE_COMMENT= 1,
+ XMLC14N_NORMALIZE_PI= 2,
+ XMLC14N_NORMALIZE_TEXT= 3
+} xmlC14NNormalizationMode;
+
+static xmlChar* xmlC11NNormalizeString (const xmlChar *input,
+ xmlC14NNormalizationMode mode);
+
+#define xmlC11NNormalizeAttr( a ) \
+ xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_ATTR)
+#define xmlC11NNormalizeComment( a ) \
+ xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_COMMENT)
+#define xmlC11NNormalizePI( a ) \
+ xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_PI)
+#define xmlC11NNormalizeText( a ) \
+ xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_TEXT)
+
+/************************************************************************
+ * *
+ * The implementation internals *
+ * *
+ ************************************************************************/
+
+/**
+ * xmlC14NIsVisible:
+ * @ctx: the C14N context
+ * @node: the node to check
+ *
+ * Checks whether the given node is visible. If the XML document normalization
+ * was called for the whole document then it is always "true".
+ *
+ * Returns 1 if the node is visible or 0 otherwise.
+ */
+/* todo: make it a define? */
+static int
+xmlC14NIsVisible(xmlC14NCtxPtr ctx, void *node) {
+ /*
+ * If the input is an XPath node-set, then the node-set must explicitly
+ * contain every node to be rendered to the canonical form.
+ */
+ if(ctx->visible_nodes != NULL &&
+ !xmlXPathNodeSetContains(ctx->visible_nodes, (xmlNodePtr)node)) {
+ return(0);
+ }
+
+ return(1);
+}
+
+/**
+ * xmlC14NIsXmlNs:
+ * @ns: the namespace to check
+ *
+ * Checks whether the given namespace is a default "xml:" namespace
+ * with href="http://www.w3.org/XML/1998/namespace"
+ *
+ * Returns 1 if the node is default or 0 otherwise
+ */
+/* todo: make it a define? */
+static int
+xmlC14NIsXmlNs(xmlNsPtr ns) {
+ return (ns != NULL &&
+ xmlStrEqual(ns->prefix, BAD_CAST "xml") &&
+ xmlStrEqual(ns->href, BAD_CAST "http://www.w3.org/XML/1998/namespace"));
+}
+
+/**
+ * xmlExcC14NIsRendered:
+ * @ctx the C14N context
+ * @ns the namespace to check
+ *
+ * Checks whether the given namespace was already rendered or not
+ *
+ * Returns 1 if we already wrote this namespace or 0 otherwise
+ */
+static int
+xmlExcC14NIsRendered(xmlC14NCtxPtr ctx, xmlNsPtr ns) {
+ int i;
+
+ if(ctx == NULL || ctx->ns_rendered == NULL || ns == NULL) {
+ return(0);
+ }
+
+ if(ctx->ns_rendered->nodeTab != NULL) {
+ for(i = ctx->ns_rendered->nodeNr - 1; i >= 0; --i) {
+ xmlNsPtr ns1 = (xmlNsPtr)ctx->ns_rendered->nodeTab[i];
+ if(xmlStrEqual(ns1->prefix, ns->prefix)) {
+ return (xmlStrEqual(ns1->href, ns->href));
+ }
+ }
+ }
+ /*
+ * if the default namespace xmlns="" is not defined yet then
+ * we do not want to print it out
+ */
+ return(xmlStrlen(ns->prefix) == 0 && xmlStrlen(ns->href) == 0);
+}
+
+/**
+ * xmlC14NNamespacesCompare:
+ * @ns1: the pointer to first namespace
+ * @ns2: the pointer to second namespace
+ *
+ * Compares the namespaces by names (prefixes).
+ *
+ * Returns -1 if ns1 < ns2, 0 if ns1 == ns2 or 1 if ns1 > ns2.
+ */
+static int
+xmlC14NNamespacesCompare(xmlNsPtr ns1, xmlNsPtr ns2) {
+ if(ns1 == ns2) return(0);
+ if(ns1 == NULL) return(-1);
+ if(ns2 == NULL) return(1);
+
+ return(xmlStrcmp(ns1->prefix, ns2->prefix));
+}
+
+
+/**
+ * xmlC14NPrintNamespaces:
+ * @ns: the pointer to namespace
+ * @ctx: the C14N context
+ *
+ * Prints the given namespace to the output buffer from C14N context.
+ *
+ * Returns 1 on success or 0 on fail.
+ */
+static int
+xmlC14NPrintNamespaces(const xmlNsPtr ns, xmlC14NCtxPtr ctx) {
+
+ if(ns == NULL || ctx == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NPrintNamespace: namespace or context pointer is null\n");
+#endif
+ return 0;
+ }
+
+ if(ns->prefix != NULL) {
+ xmlOutputBufferWriteString(ctx->buf, " xmlns:");
+ xmlOutputBufferWriteString(ctx->buf, (const char *)ns->prefix);
+ xmlOutputBufferWriteString(ctx->buf, "=\"");
+ } else {
+ xmlOutputBufferWriteString(ctx->buf, " xmlns=\"");
+ }
+ xmlOutputBufferWriteString(ctx->buf, (const char *) ns->href);
+ xmlOutputBufferWriteString(ctx->buf, "\"");
+ return(1);
+}
+
+/**
+ * xmlC14NProcessNamespacesAxis:
+ * @ctx: the C14N context
+ * @node: the current node
+ *
+ * Prints out canonical namespace axis of the current node to the
+ * buffer from C14N context as follows
+ *
+ * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
+ *
+ * Namespace Axis
+ * Consider a list L containing only namespace nodes in the
+ * axis and in the node-set in lexicographic order (ascending). To begin
+ * processing L, if the first node is not the default namespace node (a node
+ * with no namespace URI and no local name), then generate a space followed
+ * by xmlns="" if and only if the following conditions are met:
+ * - the element E that owns the axis is in the node-set
+ * - The nearest ancestor element of E in the node-set has a default
+ * namespace node in the node-set (default namespace nodes always
+ * have non-empty values in XPath)
+ * The latter condition eliminates unnecessary occurrences of xmlns="" in
+ * the canonical form since an element only receives an xmlns="" if its
+ * default namespace is empty and if it has an immediate parent in the
+ * canonical form that has a non-empty default namespace. To finish
+ * processing L, simply process every namespace node in L, except omit
+ * namespace node with local name xml, which defines the xml prefix,
+ * if its string value is http://www.w3.org/XML/1998/namespace.
+ *
+ * Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
+ * Canonical XML applied to a document subset requires the search of the
+ * ancestor nodes of each orphan element node for attributes in the xml
+ * namespace, such as xml:lang and xml:space. These are copied into the
+ * element node except if a declaration of the same attribute is already
+ * in the attribute axis of the element (whether or not it is included in
+ * the document subset). This search and copying are omitted from the
+ * Exclusive XML Canonicalization method.
+ *
+ * Returns 0 on success or -1 on fail.
+ */
+static int
+xmlC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur) {
+ xmlNsPtr ns;
+ xmlListPtr list;
+ xmlNodePtr visible_parent;
+ xmlNsPtr prev;
+
+ if(ctx == NULL || cur == NULL || cur->type != XML_ELEMENT_NODE) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNamespacesAxis: Null context or node pointer or type != XML_ELEMENT_NODE.\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * Create a sorted list to store element namespaces
+ */
+ list = xmlListCreate(NULL, (xmlListDataCompare)xmlC14NNamespacesCompare);
+ if(list == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNamespacesAxis: list creation failed\n");
+#endif
+ return(-1);
+ }
+
+ /* find nearest visible parent */
+ visible_parent = cur->parent;
+ while(visible_parent != NULL && !xmlC14NIsVisible(ctx, visible_parent)) {
+ visible_parent = visible_parent->parent;
+ }
+
+ /*
+ * todo: the libxml XPath implementation does not create
+ * nodes for all namespaces known to the node (i.e. for namespaces
+ * defined in node parents). By this we need to now walk thru
+ * all namespace in current node and all invisible ancesstors
+ */
+ while(cur != visible_parent) {
+ for(ns = cur->nsDef; ns != NULL; ns = ns->next) {
+ /*
+ * first of all ignore default "xml" namespace and
+ * already included namespace
+ */
+ if(xmlC14NIsXmlNs(ns) || xmlListSearch(list, ns) != NULL) {
+ continue;
+ }
+
+ /*
+ * Lookup nearest namespace after visible parent having
+ * the same prefix. Namespace included if and only if one of
+ * the following:
+ * - another namespace having the same prefix but
+ * different value found or
+ * - there is no namespaces having the same prefix and
+ * it is not a default xmlns="" namespace (empty prefix
+ * and empty href)
+ */
+ prev = xmlSearchNs(ctx->doc, visible_parent, ns->prefix);
+ if(prev == NULL && (xmlStrlen(ns->prefix) > 0 || xmlStrlen(ns->href) > 0)) {
+ xmlListInsert(list, ns);
+ } else if(prev != NULL && !xmlStrEqual(ns->href, prev->href)) {
+ xmlListInsert(list, ns);
+ }
+ }
+ cur = cur->parent;
+ }
+
+ /*
+ * print out all elements from list
+ */
+ xmlListWalk(list, (xmlListWalker)xmlC14NPrintNamespaces, (const void*)ctx);
+
+ /*
+ * Cleanup
+ */
+ xmlListDelete(list);
+ return(0);
+}
+
+/**
+ * xmlExcC14NProcessNamespacesAxis:
+ * @ctx: the C14N context
+ * @node: the current node
+ *
+ * Prints out exclusive canonical namespace axis of the current node to the
+ * buffer from C14N context as follows
+ *
+ * Exclusive XML Canonicalization
+ * http://www.w3.org/TR/xml-exc-c14n
+ *
+ * If the element node is in the XPath subset then output the node in
+ * accordance with Canonical XML except for namespace nodes which are
+ * rendered as follows:
+ *
+ * 1. Render each namespace node iff:
+ * * it is visibly utilized by the immediate parent element or one of
+ * its attributes, or is present in InclusiveNamespaces PrefixList, and
+ * * its prefix and value do not appear in ns_rendered. ns_rendered is
+ * obtained by popping the state stack in order to obtain a list of
+ * prefixes and their values which have already been rendered by
+ * an output ancestor of the namespace node's parent element.
+ * 2. Append the rendered namespace node to the list ns_rendered of namespace
+ * nodes rendered by output ancestors. Push ns_rendered on state stack and
+ * recurse.
+ * 3. After the recursion returns, pop thestate stack.
+ *
+ *
+ * Returns 0 on success or -1 on fail.
+ */
+static int
+xmlExcC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur) {
+ xmlListPtr list;
+ xmlAttrPtr attr;
+ xmlNsPtr ns;
+
+ if(ctx == NULL || cur == NULL || cur->type != XML_ELEMENT_NODE) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlExcC14NProcessNamespacesAxis: Null context or node pointer or type != XML_ELEMENT_NODE.\n");
+#endif
+ return(-1);
+ }
+
+ if(!ctx->exclusive || ctx->ns_rendered == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlExcC14NProcessNamespacesAxis: called for non-exclusive canonization or rendered stack is NULL.\n");
+#endif
+ return(-1);
+
+ }
+
+ /*
+ * Create a sorted list to store element namespaces
+ */
+ list = xmlListCreate(NULL, (xmlListDataCompare)xmlC14NNamespacesCompare);
+ if(list == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlExcC14NProcessNamespacesAxis: list creation failed\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * First of all, add all namespaces required by current node
+ * (i.e. node namespace and all attribute namespaces)
+ * todo: do we need to check for default "xml:" namespace
+ */
+ ns = (cur->ns != NULL) ? cur->ns : xmlSearchNs(ctx->doc, cur, NULL);
+ if(ns != NULL && !xmlC14NIsXmlNs(ns) && xmlListSearch(list, ns) == NULL) {
+ if(!xmlExcC14NIsRendered(ctx, ns)) {
+ xmlListInsert(list, ns);
+ xmlXPathNodeSetAdd(ctx->ns_rendered, (xmlNodePtr)ns);
+ }
+ }
+ attr = cur->properties;
+ while (attr != NULL) {
+ /*
+ * todo: do we need to check that attribute is visible and has non
+ * default namespace
+ */
+ if(xmlC14NIsVisible(ctx, attr)) {
+ ns = (attr->ns != NULL) ? attr->ns : xmlSearchNs(ctx->doc, cur, NULL);
+ if(ns != NULL && xmlC14NIsVisible(ctx, attr) && !xmlC14NIsXmlNs(ns)) {
+ if(xmlListSearch(list, ns) == NULL &&
+ !xmlExcC14NIsRendered(ctx, ns)) {
+ xmlListInsert(list, ns);
+ xmlXPathNodeSetAdd(ctx->ns_rendered, (xmlNodePtr)ns);
+ }
+ }
+ }
+ attr = attr->next;
+ }
+
+ /*
+ * Next add all inclusive namespaces if needed.
+ */
+ if(ctx->inclusive_ns_prefixes != NULL) {
+ int i;
+ xmlChar *prefix;
+
+ for(i = 0; ctx->inclusive_ns_prefixes[i] != NULL; ++i) {
+ prefix = ctx->inclusive_ns_prefixes[i];
+ /*
+ * Special values for namespace with empty prefix
+ */
+ if(xmlStrEqual(prefix, BAD_CAST "#default") || xmlStrEqual(prefix, BAD_CAST "")) {
+ prefix = NULL;
+ }
+ ns = xmlSearchNs(ctx->doc, cur, prefix);
+ if(ns != NULL && !xmlC14NIsXmlNs(ns)) {
+ if(xmlListSearch(list, ns) == NULL &&
+ !xmlExcC14NIsRendered(ctx, ns)) {
+ xmlListInsert(list, ns);
+ xmlXPathNodeSetAdd(ctx->ns_rendered, (xmlNodePtr)ns);
+ }
+ }
+ }
+ }
+
+ /*
+ * print out all elements from list
+ */
+ xmlListWalk(list, (xmlListWalker)xmlC14NPrintNamespaces, (const void*)ctx);
+
+ /*
+ * Cleanup
+ */
+ xmlListDelete(list);
+ return(0);
+}
+
+
+/**
+ * xmlC14NAttrsCompare:
+ * @attr1: the pointer to first attr
+ * @attr2: the pointer to second attr
+ *
+ * Prints the given attribute to the output buffer from C14N context.
+ *
+ * Returns -1 if attr1 < attr2, 0 if attr1 == attr2 or 1 if attr1 > attr2.
+ */
+static int
+xmlC14NAttrsCompare(xmlAttrPtr attr1, xmlAttrPtr attr2) {
+ int ret = 0;
+
+ /*
+ * Simple cases
+ */
+ if(attr1 == attr2) return(0);
+ if(attr1 == NULL) return(-1);
+ if(attr2 == NULL) return(1);
+ if(attr1->ns == attr2->ns) {
+ return(xmlStrcmp(attr1->name, attr2->name));
+ }
+
+ /*
+ * Attributes in the default namespace are first
+ * because the default namespace is not applied to
+ * unqualified attributes
+ */
+ if(attr1->ns == NULL) return(-1);
+ if(attr2->ns == NULL) return(1);
+ if(attr1->ns->prefix == NULL) return(-1);
+ if(attr2->ns->prefix == NULL) return(1);
+
+ ret = xmlStrcmp(attr1->ns->href, attr2->ns->href);
+ if(ret == 0) {
+ ret = xmlStrcmp(attr1->name, attr2->name);
+ }
+ return(ret);
+}
+
+
+/**
+ * xmlC14NPrintAttrs:
+ * @attr: the pointer to attr
+ * @ctx: the C14N context
+ *
+ * Prints out canonical attribute urrent node to the
+ * buffer from C14N context as follows
+ *
+ * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
+ *
+ * Returns 1 on success or 0 on fail.
+ */
+static int
+xmlC14NPrintAttrs(const xmlAttrPtr attr, xmlC14NCtxPtr ctx) {
+ xmlChar *value;
+ xmlChar *buffer;
+
+ if(attr == NULL || ctx == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NPrintAttrs: attr == NULL or ctx == NULL\n");
+#endif
+ return(0);
+ }
+
+ xmlOutputBufferWriteString(ctx->buf, " ");
+ if(attr->ns != NULL && xmlStrlen(attr->ns->prefix) > 0) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *) attr->ns->prefix);
+ xmlOutputBufferWriteString(ctx->buf, ":");
+ }
+ xmlOutputBufferWriteString(ctx->buf, (const char *) attr->name);
+ xmlOutputBufferWriteString(ctx->buf, "=\"");
+
+ value = xmlNodeListGetString(attr->doc, attr->children, 1);
+ /* todo: should we log an error if value==NULL ? */
+ if(value != NULL) {
+ buffer = xmlC11NNormalizeAttr(value);
+ xmlFree(value);
+ if (buffer != NULL) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *)buffer);
+ xmlFree(buffer);
+ } else {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NPrintAttrs: xmlC11NNormalizeAttr failed\n");
+#endif
+ return(0);
+ }
+ }
+ xmlOutputBufferWriteString(ctx->buf, "\"");
+ return(1);
+}
+
+/**
+ * xmlC14NProcessAttrsAxis:
+ * @ctx: the C14N context
+ * @cur: the current node
+ *
+ * Prints out canonical attribute axis of the current node to the
+ * buffer from C14N context as follows
+ *
+ * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
+ *
+ * Attribute Axis
+ * In lexicographic order (ascending), process each node that
+ * is in the element's attribute axis and in the node-set.
+ *
+ * The processing of an element node E MUST be modified slightly
+ * when an XPath node-set is given as input and the element's
+ * parent is omitted from the node-set.
+ *
+ *
+ * Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
+ *
+ * Canonical XML applied to a document subset requires the search of the
+ * ancestor nodes of each orphan element node for attributes in the xml
+ * namespace, such as xml:lang and xml:space. These are copied into the
+ * element node except if a declaration of the same attribute is already
+ * in the attribute axis of the element (whether or not it is included in
+ * the document subset). This search and copying are omitted from the
+ * Exclusive XML Canonicalization method.
+ *
+ * Returns 0 on success or -1 on fail.
+ */
+static int
+xmlC14NProcessAttrsAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur) {
+ xmlAttrPtr attr;
+ xmlListPtr list;
+
+ if(ctx == NULL || cur == NULL || cur->type != XML_ELEMENT_NODE) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessAttrsAxis: Null context or node pointer or type != XML_ELEMENT_NODE.\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * Create a sorted list to store element attributes
+ */
+ list = xmlListCreate(NULL, (xmlListDataCompare)xmlC14NAttrsCompare);
+ if(list == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessAttrsAxis: list creation failed\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * Add all visible attributes from current node.
+ */
+ attr = cur->properties;
+ while (attr != NULL) {
+ /* check that attribute is visible */
+ if(xmlC14NIsVisible(ctx, attr)) {
+ xmlListInsert(list, attr);
+ }
+ attr = attr->next;
+ }
+
+ /*
+ * include attributes in "xml" namespace defined in ancestors
+ * (only for non-exclusive XML Canonicalization)
+ */
+ if(!ctx->exclusive && cur->parent != NULL && !xmlC14NIsVisible(ctx, cur->parent)) {
+ /*
+ * If XPath node-set is not specified then the parent is always
+ * visible!
+ */
+ cur = cur->parent;
+ while(cur != NULL) {
+ attr = cur->properties;
+ while (attr != NULL) {
+ if(attr->ns != NULL && xmlStrEqual(attr->ns->prefix, BAD_CAST "xml")) {
+ if(xmlListSearch(list, attr) == NULL) {
+ xmlListInsert(list, attr);
+ }
+ }
+ attr = attr->next;
+ }
+ cur = cur->parent;
+ }
+ }
+
+ /*
+ * print out all elements from list
+ */
+ xmlListWalk(list, (xmlListWalker)xmlC14NPrintAttrs, (const void*)ctx);
+
+ /*
+ * Cleanup
+ */
+ xmlListDelete(list);
+ return(0);
+}
+
+/**
+ * xmlC14NCheckForRelativeNamespaces:
+ * @ctx: the C14N context
+ * @cur: the current element node
+ *
+ * Checks that current element node has no relative namespaces defined
+ *
+ * Returns 0 if the node has no relative namespaces or -1 otherwise.
+ */
+static int
+xmlC14NCheckForRelativeNamespaces(xmlC14NCtxPtr ctx, xmlNodePtr cur) {
+ xmlNsPtr ns;
+
+ if(ctx == NULL || cur == NULL || cur->type != XML_ELEMENT_NODE) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NCheckForRelativeNamespaces: Null context or node pointer or type != XML_ELEMENT_NODE.\n");
+#endif
+ return(-1);
+ }
+
+ ns = cur->nsDef;
+ while(ns != NULL) {
+ if(xmlStrlen(ns->href) > 0) {
+ xmlURIPtr uri;
+
+ uri = xmlParseURI((const char *) ns->href);
+ if(uri == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NCheckForRelativeNamespaces: unable to parse uri=\"%s\".\n", ns->href);
+#endif
+ return(-1);
+ }
+ if(xmlStrlen((const xmlChar *) uri->scheme) == 0) {
+ xmlFreeURI(uri);
+ return(-1);
+ }
+ if(!xmlStrEqual((const xmlChar *) uri->scheme, BAD_CAST "urn") && xmlStrlen((const xmlChar *) uri->server) == 0) {
+ xmlFreeURI(uri);
+ return(-1);
+ }
+ xmlFreeURI(uri);
+ }
+ ns = ns->next;
+ }
+ return(0);
+}
+
+/**
+ * xmlC14NProcessElementNode:
+ * @ctx: the pointer to C14N context object
+ * @cur: the node to process
+ *
+ * Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
+ *
+ * Element Nodes
+ * If the element is not in the node-set, then the result is obtained
+ * by processing the namespace axis, then the attribute axis, then
+ * processing the child nodes of the element that are in the node-set
+ * (in document order). If the element is in the node-set, then the result
+ * is an open angle bracket (<), the element QName, the result of
+ * processing the namespace axis, the result of processing the attribute
+ * axis, a close angle bracket (>), the result of processing the child
+ * nodes of the element that are in the node-set (in document order), an
+ * open angle bracket, a forward slash (/), the element QName, and a close
+ * angle bracket.
+ *
+ * Returns non-negative value on success or negative value on fail
+ */
+static int
+xmlC14NProcessElementNode(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible) {
+ int ret;
+ int ns_rendered_pos = 0;
+
+ if(ctx == NULL || cur == NULL || cur->type != XML_ELEMENT_NODE) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessElementNode: Null context or node pointer or type != XML_ELEMENT_NODE.\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * Check relative relative namespaces:
+ * implementations of XML canonicalization MUST report an operation
+ * failure on documents containing relative namespace URIs.
+ */
+ if(xmlC14NCheckForRelativeNamespaces(ctx, cur) < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessElementNode: xmlC14NCheckForRelativeNamespaces failed.\n");
+#endif
+ return(-1);
+ }
+
+
+ /*
+ * Save ns_rendered stack position for exclusive
+ * processing
+ */
+ if(ctx->exclusive && ctx->ns_rendered != NULL) {
+ ns_rendered_pos = ctx->ns_rendered->nodeNr;
+ }
+
+ if(visible) {
+ if(ctx->parent_is_doc) {
+ ctx->pos = XMLC14N_INSIDE_DOCUMENT_ELEMENT;
+ }
+ xmlOutputBufferWriteString(ctx->buf, "<");
+
+ if(cur->ns != NULL && xmlStrlen(cur->ns->prefix) > 0) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *)cur->ns->prefix);
+ xmlOutputBufferWriteString(ctx->buf, ":");
+ }
+ xmlOutputBufferWriteString(ctx->buf, (const char *)cur->name);
+
+ if(ctx->exclusive) {
+ ret = xmlExcC14NProcessNamespacesAxis(ctx, cur);
+ } else {
+ ret = xmlC14NProcessNamespacesAxis(ctx, cur);
+ }
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessElementNode: xmlC14NProcessNamespacesAxis failed.\n");
+#endif
+ return(-1);
+ }
+
+ ret = xmlC14NProcessAttrsAxis(ctx, cur);
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessElementNode: xmlC14NProcessAttrsAxis failed.\n");
+#endif
+ return(-1);
+ }
+
+ xmlOutputBufferWriteString(ctx->buf, ">");
+ }
+ if (cur->children != NULL) {
+ ret = xmlC14NProcessNodeList(ctx, cur->children);
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessElementNode: xmlC14NProcessNodeList failed.\n");
+#endif
+ return(-1);
+ }
+ }
+ if(visible) {
+ xmlOutputBufferWriteString(ctx->buf, "</");
+ if(cur->ns != NULL && xmlStrlen(cur->ns->prefix) > 0) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *)cur->ns->prefix);
+ xmlOutputBufferWriteString(ctx->buf, ":");
+ }
+ xmlOutputBufferWriteString(ctx->buf, (const char *)cur->name);
+ xmlOutputBufferWriteString(ctx->buf, ">");
+ if(ctx->parent_is_doc) {
+ ctx->pos = XMLC14N_AFTER_DOCUMENT_ELEMENT;
+ }
+ }
+
+ /*
+ * Restore ns_rendered stack position for exclusive
+ * processing
+ */
+ if(ctx->exclusive && ctx->ns_rendered != NULL) {
+ ctx->ns_rendered->nodeNr = ns_rendered_pos;
+ }
+ return(0);
+}
+
+/**
+ * xmlC14NProcessNode:
+ * @ctx: the pointer to C14N context object
+ * @cur: the node to process
+ *
+ * Processes the given node
+ *
+ * Returns non-negative value on success or negative value on fail
+ */
+static int
+xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur) {
+ int ret = 0;
+ int visible;
+
+ if(ctx == NULL || cur == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: Null context or node pointer.\n");
+#endif
+ return(-1);
+ }
+
+ visible = xmlC14NIsVisible(ctx, cur);
+ switch(cur->type) {
+ case XML_ELEMENT_NODE:
+ ret = xmlC14NProcessElementNode(ctx, cur, visible);
+ break;
+ case XML_CDATA_SECTION_NODE:
+ case XML_TEXT_NODE:
+ /*
+ * Text Nodes
+ * the string value, except all ampersands are replaced
+ * by &, all open angle brackets (<) are replaced by <, all closing
+ * angle brackets (>) are replaced by >, and all #xD characters are
+ * replaced by 
.
+ */
+ /* cdata sections are processed as text nodes */
+ /* todo: verify that cdata sections are included in XPath nodes set */
+ if(visible && cur->content != NULL) {
+ xmlChar *buffer;
+
+#ifndef XML_USE_BUFFER_CONTENT
+ buffer = xmlC11NNormalizeText(cur->content);
+#else
+ buffer = xmlC11NNormalizeText(xmlBufferContent(cur->content));
+#endif
+ if(buffer != NULL) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *)buffer);
+ xmlFree(buffer);
+ } else {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: xmlC11NNormalizeText() failed\n");
+#endif
+ return(-1);
+ }
+ }
+ break;
+ case XML_PI_NODE:
+ /*
+ * Processing Instruction (PI) Nodes-
+ * The opening PI symbol (<?), the PI target name of the node,
+ * a leading space and the string value if it is not empty, and
+ * the closing PI symbol (?>). If the string value is empty,
+ * then the leading space is not added. Also, a trailing #xA is
+ * rendered after the closing PI symbol for PI children of the
+ * root node with a lesser document order than the document
+ * element, and a leading #xA is rendered before the opening PI
+ * symbol of PI children of the root node with a greater document
+ * order than the document element.
+ */
+ if(visible) {
+ if(ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
+ xmlOutputBufferWriteString(ctx->buf, "\x0A<?");
+ } else {
+ xmlOutputBufferWriteString(ctx->buf, "<?");
+ }
+
+ xmlOutputBufferWriteString(ctx->buf, (const char *)cur->name);
+ if(cur->content != NULL && *(cur->content) != '\0') {
+ xmlChar *buffer;
+ xmlOutputBufferWriteString(ctx->buf, " ");
+
+ /* todo: do we need to normalize pi? */
+#ifndef XML_USE_BUFFER_CONTENT
+ buffer = xmlC11NNormalizePI(cur->content);
+#else
+ buffer = xmlC11NNormalizePI(xmlBufferContent(cur->content));
+#endif
+ if (buffer != NULL) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *)buffer);
+ xmlFree(buffer);
+ } else {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: xmlC11NNormalizePI() failed\n");
+#endif
+ return(-1);
+ }
+ }
+
+ if(ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
+ xmlOutputBufferWriteString(ctx->buf, "?>\x0A");
+ } else {
+ xmlOutputBufferWriteString(ctx->buf, "?>");
+ }
+ }
+ break;
+ case XML_COMMENT_NODE:
+ /*
+ * Comment Nodes
+ * Nothing if generating canonical XML without comments. For
+ * canonical XML with comments, generate the opening comment
+ * symbol (<!--), the string value of the node, and the
+ * closing comment symbol (-->). Also, a trailing #xA is rendered
+ * after the closing comment symbol for comment children of the
+ * root node with a lesser document order than the document
+ * element, and a leading #xA is rendered before the opening
+ * comment symbol of comment children of the root node with a
+ * greater document order than the document element. (Comment
+ * children of the root node represent comments outside of the
+ * top-level document element and outside of the document type
+ * declaration).
+ */
+ if(visible && ctx->with_comments) {
+ if(ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
+ xmlOutputBufferWriteString(ctx->buf, "\x0A<!--");
+ } else {
+ xmlOutputBufferWriteString(ctx->buf, "<!--");
+ }
+
+ if(cur->content != NULL) {
+ xmlChar *buffer;
+
+ /* todo: do we need to normalize comment? */
+#ifndef XML_USE_BUFFER_CONTENT
+ buffer = xmlC11NNormalizeComment(cur->content);
+#else
+ buffer = xmlC11NNormalizeString(xmlBufferContent(cur->content));
+#endif
+ if (buffer != NULL) {
+ xmlOutputBufferWriteString(ctx->buf, (const char *)buffer);
+ xmlFree(buffer);
+ } else {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: xmlC11NNormalizeComment() failed\n");
+#endif
+ return(-1);
+ }
+ }
+
+ if(ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
+ xmlOutputBufferWriteString(ctx->buf, "-->\x0A");
+ } else {
+ xmlOutputBufferWriteString(ctx->buf, "-->");
+ }
+ }
+ break;
+ case XML_DOCUMENT_NODE:
+ case XML_DOCUMENT_FRAG_NODE: /* should be processed as document? */
+ case XML_DOCB_DOCUMENT_NODE: /* should be processed as document? */
+ case XML_HTML_DOCUMENT_NODE: /* should be processed as document? */
+ if (cur->children != NULL) {
+ ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
+ ctx->parent_is_doc = 1;
+ ret = xmlC14NProcessNodeList(ctx, cur->children);
+ }
+ break;
+
+ case XML_ATTRIBUTE_NODE:
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: XML_ATTRIBUTE_NODE is illegal here\n");
+ return(-1);
+ case XML_NAMESPACE_DECL:
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: XML_NAMESPACE_DECL is illegal here\n");
+ return(-1);
+ case XML_ENTITY_REF_NODE:
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: XML_ENTITY_REF_NODE is illegal here\n");
+ return(-1);
+ case XML_ENTITY_NODE:
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: XML_ENTITY_NODE is illegal here\n");
+ return(-1);
+
+ case XML_DOCUMENT_TYPE_NODE:
+ case XML_NOTATION_NODE:
+ case XML_DTD_NODE:
+ case XML_ELEMENT_DECL:
+ case XML_ATTRIBUTE_DECL:
+ case XML_ENTITY_DECL:
+ case XML_XINCLUDE_START:
+ case XML_XINCLUDE_END:
+ /*
+ * should be ignored according to "W3C Canonical XML"
+ */
+ break;
+ default:
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNode: unknown node type = %d\n", cur->type);
+#endif
+ return(-1);
+ }
+
+ return(ret);
+}
+
+/**
+ * xmlC14NProcessNodeList:
+ * @ctx: the pointer to C14N context object
+ * @cur: the node to start from
+ *
+ * Processes all nodes in the row starting from cur.
+ *
+ * Returns non-negative value on success or negative value on fail
+ */
+static int
+xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur) {
+ int ret;
+
+ if(ctx == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NProcessNodeList: Null context pointer.\n");
+#endif
+ return(-1);
+ }
+
+ for(ret = 0; cur != NULL && ret >= 0; cur = cur->next) {
+ ret = xmlC14NProcessNode(ctx, cur);
+ }
+ return(ret);
+}
+
+
+/**
+ * xmlC14NFreeCtx:
+ * @ctx: the pointer to C14N context object
+ *
+ * Cleanups the C14N context object.
+ */
+
+static void
+xmlC14NFreeCtx(xmlC14NCtxPtr ctx) {
+ if(ctx == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NFreeCtx: ctx == NULL\n");
+#endif
+ return;
+ }
+
+ if(ctx->ns_rendered != NULL) {
+ xmlXPathFreeNodeSet(ctx->ns_rendered);
+ }
+ xmlFree(ctx);
+}
+
+/**
+ * xmlC14NNewCtx:
+ * @doc: the XML document for canonization
+ * @nodes: the nodes set to be included in the canonized image
+ * or NULL if all document nodes should be included
+ * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
+ * otherwise - exclusive canonicalization)
+ * @inclusive_ns_prefixe the list of inclusive namespace prefixes
+ * ended with a NULL or NULL if there is no
+ * inclusive namespaces (only for exclusive
+ * canonicalization)
+ * @with_comments: include comments in the result (!=0) or not (==0)
+ * @buf: the output buffer to store canonical XML; this
+ * buffer MUST have encoder==NULL because C14N requires
+ * UTF-8 output
+ *
+ * Creates new C14N context object to store C14N parameters.
+ *
+ * Returns pointer to newly created object (success) or NULL (fail)
+ */
+static xmlC14NCtxPtr
+xmlC14NNewCtx(xmlDocPtr doc, xmlNodeSetPtr nodes,
+ int exclusive, xmlChar **inclusive_ns_prefixes,
+ int with_comments,
+ xmlOutputBufferPtr buf) {
+ xmlC14NCtxPtr ctx;
+
+ if(doc == NULL || buf == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NNewCtx: pointer to document or output buffer is NULL\n");
+#endif
+ return(NULL);
+ }
+
+ /*
+ * Validate the encoding output buffer encoding
+ */
+ if(buf->encoder != NULL) {
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NNewCtx: output buffer encoder != NULL but C14N requires UTF8 output\n");
+ return(NULL);
+ }
+
+ /*
+ * Validate the XML document encoding value, if provided.
+ */
+ if(doc->charset != XML_CHAR_ENCODING_UTF8) {
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NNewCtx: source document not in UTF8\n");
+ return(NULL);
+ }
+
+ /*
+ * Allocate a new xmlC14NCtxPtr and fill the fields.
+ */
+ ctx = (xmlC14NCtxPtr) xmlMalloc(sizeof(xmlC14NCtx));
+ if (ctx == NULL) {
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NNewCtx: malloc failed\n");
+ return(NULL);
+ }
+ memset(ctx, 0, sizeof(xmlC14NCtx));
+
+ /*
+ * initialize C14N context
+ */
+ ctx->doc = doc;
+ ctx->with_comments = with_comments;
+ ctx->visible_nodes = nodes;
+ ctx->buf = buf;
+ ctx->parent_is_doc = 1;
+ ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
+
+ /*
+ * Set "exclusive" flag, create a nodes set for namespaces
+ * stack and remember list of incluseve prefixes
+ */
+ if(exclusive) {
+ ctx->exclusive = 1;
+ ctx->ns_rendered = xmlXPathNodeSetCreate(NULL);
+ ctx->inclusive_ns_prefixes = inclusive_ns_prefixes;
+ }
+ return(ctx);
+}
+
+/**
+ * xmlC14NDocSaveTo:
+ * @doc: the XML document for canonization
+ * @nodes: the nodes set to be included in the canonized image
+ * or NULL if all document nodes should be included
+ * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
+ * otherwise - exclusive canonicalization)
+ * @inclusive_ns_prefixe the list of inclusive namespace prefixes
+ * ended with a NULL or NULL if there is no
+ * inclusive namespaces (only for exclusive
+ * canonicalization, ignored otherwise)
+ * @with_comments: include comments in the result (!=0) or not (==0)
+ * @buf: the output buffer to store canonical XML; this
+ * buffer MUST have encoder==NULL because C14N requires
+ * UTF-8 output
+ *
+ * Dumps the canonized image of given XML document into the provided buffer.
+ * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
+ * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
+ *
+ * Returns non-negative value on success or a negative value on fail
+ */
+int
+xmlC14NDocSaveTo(xmlDocPtr doc, xmlNodeSetPtr nodes,
+ int exclusive, xmlChar **inclusive_ns_prefixes,
+ int with_comments,
+ xmlOutputBufferPtr buf) {
+ xmlC14NCtxPtr ctx;
+ int ret;
+
+ if(buf == NULL || doc == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSaveTo: null return buffer or doc pointer\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * Validate the encoding output buffer encoding
+ */
+ if(buf->encoder != NULL) {
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSaveTo: output buffer encoder != NULL but C14N requires UTF8 output\n");
+ return(-1);
+ }
+
+ ctx = xmlC14NNewCtx(doc, nodes, exclusive, inclusive_ns_prefixes,
+ with_comments, buf);
+ if(ctx == NULL) {
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSaveTo: unable to create C14N context\n");
+ return(-1);
+ }
+
+
+
+ /*
+ * Root Node
+ * The root node is the parent of the top-level document element. The
+ * result of processing each of its child nodes that is in the node-set
+ * in document order. The root node does not generate a byte order mark,
+ * XML declaration, nor anything from within the document type
+ * declaration.
+ */
+ if(doc->children != NULL) {
+ ret = xmlC14NProcessNodeList(ctx, doc->children);
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSaveTo: process childrens' list failed.\n");
+#endif
+ xmlC14NFreeCtx(ctx);
+ return(-1);
+ }
+ }
+
+ /*
+ * Flush buffer to get number of bytes written
+ */
+ ret = xmlOutputBufferFlush(buf);
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSaveTo: buffer flush failed.\n");
+#endif
+ xmlC14NFreeCtx(ctx);
+ return(-1);
+ }
+
+ /*
+ * Cleanup
+ */
+ xmlC14NFreeCtx(ctx);
+ return(ret);
+}
+
+/**
+ * xmlC14NDocDumpMemory:
+ * @doc: the XML document for canonization
+ * @nodes: the nodes set to be included in the canonized image
+ * or NULL if all document nodes should be included
+ * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
+ * otherwise - exclusive canonicalization)
+ * @inclusive_ns_prefixe the list of inclusive namespace prefixes
+ * ended with a NULL or NULL if there is no
+ * inclusive namespaces (only for exclusive
+ * canonicalization, ignored otherwise)
+ * @with_comments: include comments in the result (!=0) or not (==0)
+ * @doc_txt_ptr: the memory pointer for allocated canonical XML text;
+ * the caller of this functions is responsible for calling
+ * xmlFree() to free allocated memory
+ *
+ * Dumps the canonized image of given XML document into memory.
+ * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
+ * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
+ *
+ * Returns the number of bytes written on success or a negative value on fail
+ */
+int
+xmlC14NDocDumpMemory(xmlDocPtr doc, xmlNodeSetPtr nodes,
+ int exclusive, xmlChar **inclusive_ns_prefixes,
+ int with_comments,
+ xmlChar **doc_txt_ptr) {
+ int ret;
+ xmlOutputBufferPtr buf;
+
+ if (doc_txt_ptr == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocDumpMemory: null return buffer pointer\n");
+#endif
+ return(-1);
+ }
+
+ *doc_txt_ptr = NULL;
+
+ /*
+ * create memory buffer with UTF8 (default) encoding
+ */
+ buf = xmlAllocOutputBuffer(NULL);
+ if(buf == NULL ) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocDumpMemory: failed to allocate output buffer.\n");
+#endif
+ return(-1);
+ }
+
+ /*
+ * canonize document and write to buffer
+ */
+ ret = xmlC14NDocSaveTo(doc, nodes, exclusive, inclusive_ns_prefixes,
+ with_comments, buf);
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocDumpMemory: xmlC14NDocSaveTo failed.\n");
+#endif
+ (void)xmlOutputBufferClose(buf);
+ return(-1);
+ }
+
+ ret = buf->buffer->use;
+ if(ret > 0) {
+ *doc_txt_ptr = xmlStrndup(buf->buffer->content, ret);
+ }
+ (void)xmlOutputBufferClose(buf);
+
+ if(*doc_txt_ptr == NULL && ret > 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocDumpMemory: failed to allocate memory for document text representation\n");
+#endif
+ return(-1);
+ }
+ return(ret);
+}
+
+/**
+ * xmlC14NDocSave:
+ * @doc: the XML document for canonization
+ * @nodes: the nodes set to be included in the canonized image
+ * or NULL if all document nodes should be included
+ * @exclusive: the exclusive flag (0 - non-exclusive canonicalization;
+ * otherwise - exclusive canonicalization)
+ * @inclusive_ns_prefixe the list of inclusive namespace prefixes
+ * ended with a NULL or NULL if there is no
+ * inclusive namespaces (only for exclusive
+ * canonicalization, ignored otherwise)
+ * @with_comments: include comments in the result (!=0) or not (==0)
+ * @filename: the filename to store canonical XML image
+ * @compression: the compression level (zlib requred):
+ * -1 - libxml default,
+ * 0 - uncompressed,
+ * >0 - compression level
+ *
+ * Dumps the canonized image of given XML document into the file.
+ * For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
+ * "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
+ *
+ * Returns the number of bytes written success or a negative value on fail
+ */
+int
+xmlC14NDocSave(xmlDocPtr doc, xmlNodeSetPtr nodes,
+ int exclusive, xmlChar **inclusive_ns_prefixes,
+ int with_comments,
+ const char* filename, int compression) {
+ xmlOutputBufferPtr buf;
+ int ret;
+
+ if(filename == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSave: filename is NULL\n");
+#endif
+ return(-1);
+ }
+
+#ifdef HAVE_ZLIB_H
+ if(compression < 0) compression = xmlGetCompressMode();
+#endif
+
+ /*
+ * save the content to a temp buffer, use default UTF8 encoding.
+ */
+ buf = xmlOutputBufferCreateFilename(filename, NULL, compression);
+ if (buf == NULL) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSave: unable to create buffer for file=\"%s\" with compressin=%d\n", filename, compression);
+#endif
+ return(-1);
+ }
+
+ /*
+ * canonize document and write to buffer
+ */
+ ret = xmlC14NDocSaveTo(doc, nodes, exclusive, inclusive_ns_prefixes,
+ with_comments, buf);
+ if(ret < 0) {
+#ifdef DEBUG_C14N
+ xmlGenericError(xmlGenericErrorContext,
+ "xmlC14NDocSave: xmlC14NDocSaveTo failed.\n");
+#endif
+ (void)xmlOutputBufferClose(buf);
+ return(-1);
+ }
+
+ /*
+ * get the numbers of bytes written
+ */
+ ret = xmlOutputBufferClose(buf);
+ return(ret);
+}
+
+
+
+/*
+ * Macro used to grow the current buffer.
+ */
+#define growBufferReentrant() { \
+ buffer_size *= 2; \
+ buffer = (xmlChar *) \
+ xmlRealloc(buffer, buffer_size * sizeof(xmlChar)); \
+ if (buffer == NULL) { \
+ perror("realloc failed"); \
+ return(NULL); \
+ } \
+}
+
+/**
+ * xmlC11NNormalizeString:
+ * @input: the input string
+ * @mode: the normalization mode (attribute, comment, PI or text)
+ *
+ * Converts a string to a canonical (normalized) format. The code is stolen
+ * from xmlEncodeEntitiesReentrant(). Added normalization of \x09, \x0a, \x0A
+ * and the @mode parameter
+ *
+ * Returns a normalized string (caller is responsible for calling xmlFree())
+ * or NULL if an error occurs
+ */
+static xmlChar *
+xmlC11NNormalizeString(const xmlChar *input, xmlC14NNormalizationMode mode) {
+ const xmlChar *cur = input;
+ xmlChar *buffer = NULL;
+ xmlChar *out = NULL;
+ int buffer_size = 0;
+
+ if (input == NULL) return(NULL);
+
+ /*
+ * allocate an translation buffer.
+ */
+ buffer_size = 1000;
+ buffer = (xmlChar *) xmlMalloc(buffer_size * sizeof(xmlChar));
+ if (buffer == NULL) {
+ perror("malloc failed");
+ return(NULL);
+ }
+ out = buffer;
+
+ while (*cur != '\0') {
+ if (out - buffer > buffer_size - 10) {
+ int indx = out - buffer;
+
+ growBufferReentrant();
+ out = &buffer[indx];
+ }
+
+ if (*cur == '<' && (mode == XMLC14N_NORMALIZE_ATTR ||
+ mode == XMLC14N_NORMALIZE_TEXT)) {
+ *out++ = '&';
+ *out++ = 'l';
+ *out++ = 't';
+ *out++ = ';';
+ } else if (*cur == '>' && (mode == XMLC14N_NORMALIZE_TEXT)) {
+ *out++ = '&';
+ *out++ = 'g';
+ *out++ = 't';
+ *out++ = ';';
+ } else if (*cur == '&' && (mode == XMLC14N_NORMALIZE_ATTR ||
+ mode == XMLC14N_NORMALIZE_TEXT)) {
+ *out++ = '&';
+ *out++ = 'a';
+ *out++ = 'm';
+ *out++ = 'p';
+ *out++ = ';';
+ } else if (*cur == '"' && (mode == XMLC14N_NORMALIZE_ATTR)) {
+ *out++ = '&';
+ *out++ = 'q';
+ *out++ = 'u';
+ *out++ = 'o';
+ *out++ = 't';
+ *out++ = ';';
+ } else if (*cur == '\x09' && (mode == XMLC14N_NORMALIZE_ATTR)) {
+ *out++ = '&';
+ *out++ = '#';
+ *out++ = 'x';
+ *out++ = '9';
+ *out++ = ';';
+ } else if (*cur == '\x0A' && (mode == XMLC14N_NORMALIZE_ATTR)) {
+ *out++ = '&';
+ *out++ = '#';
+ *out++ = 'x';
+ *out++ = 'A';
+ *out++ = ';';
+ } else if (*cur == '\x0D' && (mode == XMLC14N_NORMALIZE_ATTR ||
+ mode == XMLC14N_NORMALIZE_TEXT ||
+ mode == XMLC14N_NORMALIZE_COMMENT ||
+ mode == XMLC14N_NORMALIZE_PI)) {
+ *out++ = '&';
+ *out++ = '#';
+ *out++ = 'x';
+ *out++ = 'D';
+ *out++ = ';';
+ } else {
+ /*
+ * Works because on UTF-8, all extended sequences cannot
+ * result in bytes in the ASCII range.
+ */
+ *out++ = *cur;
+ }
+ cur++;
+ }
+ *out++ = 0;
+ return(buffer);
+}
+
+#endif /* LIBXML_C14N_ENABLED */