--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xml/libxml2libs/src/libxml2/libxml2_xlink.c	Thu Dec 17 09:29:21 2009 +0200
@@ -0,0 +1,178 @@
+/*
+ * libxml2_xlink.c : implementation of the hyperlinks detection module
+ *                   This version supports both XML XLinks and HTML simple links
+ *
+ * See Copyright for the status of this software.
+ *
+ * daniel@veillard.com
+ * Portion Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 
+ */
+
+#define IN_LIBXML
+#include "xmlenglibxml.h"
+
+#ifdef LIBXML_XPTR_ENABLED
+#include <string.h> /* for memset() only */
+#ifdef HAVE_CTYPE_H
+#include <ctype.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_ZLIB_H
+#include <zlib.h>
+#endif
+
+#include <libxml2_xmlmemory.h>
+#include <libxml2_tree.h>
+#include <libxml2_parser.h>
+#include <libxml2_valid.h>
+#include <libxml2_xlink.h>
+#include <libxml2_globals.h>
+
+#define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/")
+#define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/")
+
+/****************************************************************
+ *                                                              *
+ *           Default setting and related functions              *
+ *                                                              *
+ ****************************************************************/
+
+/**
+ * xlinkGetDefaultHandler:
+ *
+ * Get the default xlink handler.
+ *
+ * Returns the current xlinkHandlerPtr value.
+ */
+xlinkHandlerPtr
+xlinkGetDefaultHandler(void) {
+    return(xlinkDefaultHandler);
+}
+
+
+/**
+ * xlinkSetDefaultHandler:
+ * @param handler the new value for the xlink handler block
+ *
+ * Set the default xlink handlers
+ */
+void
+xlinkSetDefaultHandler(xlinkHandlerPtr handler) {
+    xlinkDefaultHandler = handler;
+}
+
+/**
+ * xlinkGetDefaultDetect:
+ *
+ * Get the default xlink detection routine
+ *
+ * Returns the current function or NULL;
+ */
+xlinkNodeDetectFunc
+xlinkGetDefaultDetect   (void) {
+    return(xlinkDefaultDetect);
+}
+
+/**
+ * xlinkSetDefaultDetect:
+ * @param func pointer to the new detection routine.
+ *
+ * Set the default xlink detection routine
+ */
+void
+xlinkSetDefaultDetect   (xlinkNodeDetectFunc func) {
+    xlinkDefaultDetect = func;
+}
+
+/****************************************************************
+ *                                                              *
+ *                  The detection routines                      *
+ *                                                              *
+ ****************************************************************/
+
+
+/**
+ * xlinkIsLink:
+ * @param doc the document containing the node
+ * @param node the node pointer itself
+ *
+ * Check whether the given node carries the attributes needed
+ * to be a link element (or is one of the linking elements issued
+ * from the (X)HTML DtDs).
+ * This routine don't try to do full checking of the link validity
+ * but tries to detect and return the appropriate link type.
+ *
+ * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no
+ *         link detected.
+ */
+xlinkType
+xlinkIsLink     (xmlDocPtr doc, xmlNodePtr node) {
+    xmlChar *type = NULL, *role = NULL;
+    xlinkType ret = XLINK_TYPE_NONE;
+
+    if (node == NULL) return(XLINK_TYPE_NONE);
+    if (doc == NULL) doc = node->doc;
+    if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
+        /*
+         * This is an HTML document.
+         */
+    } else if ((node->ns != NULL) &&
+               (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) {
+        /*
+         * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@
+         */
+        /*
+         * This is an XHTML element within an XML document
+         * Check whether it's one of the element able to carry links
+         * and in that case if it holds the attributes.
+         */
+    }
+
+    /*
+     * We don't prevent a-priori having XML Linking constructs on
+     * XHTML elements
+     */
+    type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE);
+    if (type != NULL) {
+        if (xmlStrEqual(type, BAD_CAST "simple")) {
+            ret = XLINK_TYPE_SIMPLE;
+        } if (xmlStrEqual(type, BAD_CAST "extended")) {
+            role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE);
+            if (role != NULL) {
+                xmlNsPtr xlink;
+                xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE);
+                if (xlink == NULL) {
+                    /* Humm, fallback method */
+                    if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
+                        ret = XLINK_TYPE_EXTENDED_SET;
+                } else {
+                    xmlChar buf[200];
+                    snprintf((char *) buf, sizeof(buf), "%s:external-linkset",
+                             (char *) xlink->prefix);
+                    buf[sizeof(buf) - 1] = 0;
+                    if (xmlStrEqual(role, buf))
+                        ret = XLINK_TYPE_EXTENDED_SET;
+
+                }
+
+            }
+            ret = XLINK_TYPE_EXTENDED;
+        }
+    }
+
+    if (type != NULL) xmlFree(type);
+    if (role != NULL) xmlFree(role);
+    return(ret);
+}
+#endif /* LIBXML_XPTR_ENABLED */