| 1 | /*
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| 2 | * xlink.c : implementation of the hyperlinks detection module
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| 3 | * This version supports both XML XLinks and HTML simple links
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| 4 | *
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| 5 | * See Copyright for the status of this software.
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| 6 | *
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| 7 | * [email protected]
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| 8 | */
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| 9 |
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| 10 |
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| 11 | #define IN_LIBXML
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| 12 | #include "libxml.h"
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| 13 |
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| 14 | #ifdef LIBXML_XPTR_ENABLED
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| 15 | #include <string.h> /* for memset() only */
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| 16 | #ifdef HAVE_CTYPE_H
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| 17 | #include <ctype.h>
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| 18 | #endif
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| 19 | #ifdef HAVE_STDLIB_H
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| 20 | #include <stdlib.h>
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| 21 | #endif
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| 22 | #ifdef HAVE_SYS_STAT_H
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| 23 | #include <sys/stat.h>
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| 24 | #endif
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| 25 | #ifdef HAVE_FCNTL_H
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| 26 | #include <fcntl.h>
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| 27 | #endif
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| 28 | #ifdef HAVE_UNISTD_H
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| 29 | #include <unistd.h>
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| 30 | #endif
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| 31 | #ifdef HAVE_ZLIB_H
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| 32 | #include <zlib.h>
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| 33 | #endif
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| 34 |
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| 35 | #include <libxml/xmlmemory.h>
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| 36 | #include <libxml/tree.h>
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| 37 | #include <libxml/parser.h>
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| 38 | #include <libxml/valid.h>
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| 39 | #include <libxml/xlink.h>
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| 40 | #include <libxml/globals.h>
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| 41 |
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| 42 | #define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/")
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| 43 | #define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/")
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| 44 |
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| 45 | /****************************************************************
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| 46 | * *
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| 47 | * Default setting and related functions *
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| 48 | * *
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| 49 | ****************************************************************/
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| 50 |
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| 51 | static xlinkHandlerPtr xlinkDefaultHandler = NULL;
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| 52 | static xlinkNodeDetectFunc xlinkDefaultDetect = NULL;
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| 53 |
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| 54 | /**
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| 55 | * xlinkGetDefaultHandler:
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| 56 | *
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| 57 | * Get the default xlink handler.
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| 58 | *
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| 59 | * Returns the current xlinkHandlerPtr value.
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| 60 | */
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| 61 | xlinkHandlerPtr
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| 62 | xlinkGetDefaultHandler(void) {
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| 63 | return(xlinkDefaultHandler);
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| 64 | }
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| 65 |
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| 66 |
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| 67 | /**
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| 68 | * xlinkSetDefaultHandler:
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| 69 | * @handler: the new value for the xlink handler block
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| 70 | *
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| 71 | * Set the default xlink handlers
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| 72 | */
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| 73 | void
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| 74 | xlinkSetDefaultHandler(xlinkHandlerPtr handler) {
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| 75 | xlinkDefaultHandler = handler;
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| 76 | }
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| 77 |
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| 78 | /**
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| 79 | * xlinkGetDefaultDetect:
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| 80 | *
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| 81 | * Get the default xlink detection routine
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| 82 | *
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| 83 | * Returns the current function or NULL;
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| 84 | */
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| 85 | xlinkNodeDetectFunc
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| 86 | xlinkGetDefaultDetect (void) {
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| 87 | return(xlinkDefaultDetect);
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| 88 | }
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| 89 |
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| 90 | /**
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| 91 | * xlinkSetDefaultDetect:
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| 92 | * @func: pointer to the new detection routine.
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| 93 | *
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| 94 | * Set the default xlink detection routine
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| 95 | */
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| 96 | void
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| 97 | xlinkSetDefaultDetect (xlinkNodeDetectFunc func) {
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| 98 | xlinkDefaultDetect = func;
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| 99 | }
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| 100 |
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| 101 | /****************************************************************
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| 102 | * *
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| 103 | * The detection routines *
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| 104 | * *
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| 105 | ****************************************************************/
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| 106 |
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| 107 |
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| 108 | /**
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| 109 | * xlinkIsLink:
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| 110 | * @doc: the document containing the node
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| 111 | * @node: the node pointer itself
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| 112 | *
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| 113 | * Check whether the given node carries the attributes needed
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| 114 | * to be a link element (or is one of the linking elements issued
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| 115 | * from the (X)HTML DtDs).
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| 116 | * This routine don't try to do full checking of the link validity
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| 117 | * but tries to detect and return the appropriate link type.
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| 118 | *
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| 119 | * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no
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| 120 | * link detected.
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| 121 | */
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| 122 | xlinkType
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| 123 | xlinkIsLink (xmlDocPtr doc, xmlNodePtr node) {
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| 124 | xmlChar *type = NULL, *role = NULL;
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| 125 | xlinkType ret = XLINK_TYPE_NONE;
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| 126 |
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| 127 | if (node == NULL) return(XLINK_TYPE_NONE);
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| 128 | if (doc == NULL) doc = node->doc;
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| 129 | if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) {
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| 130 | /*
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| 131 | * This is an HTML document.
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| 132 | */
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| 133 | } else if ((node->ns != NULL) &&
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| 134 | (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) {
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| 135 | /*
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| 136 | * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@
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| 137 | */
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| 138 | /*
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| 139 | * This is an XHTML element within an XML document
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| 140 | * Check whether it's one of the element able to carry links
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| 141 | * and in that case if it holds the attributes.
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| 142 | */
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| 143 | }
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| 144 |
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| 145 | /*
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| 146 | * We don't prevent a-priori having XML Linking constructs on
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| 147 | * XHTML elements
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| 148 | */
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| 149 | type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE);
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| 150 | if (type != NULL) {
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| 151 | if (xmlStrEqual(type, BAD_CAST "simple")) {
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| 152 | ret = XLINK_TYPE_SIMPLE;
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| 153 | } if (xmlStrEqual(type, BAD_CAST "extended")) {
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| 154 | role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE);
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| 155 | if (role != NULL) {
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| 156 | xmlNsPtr xlink;
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| 157 | xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE);
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| 158 | if (xlink == NULL) {
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| 159 | /* Humm, fallback method */
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| 160 | if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset"))
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| 161 | ret = XLINK_TYPE_EXTENDED_SET;
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| 162 | } else {
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| 163 | xmlChar buf[200];
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| 164 | snprintf((char *) buf, sizeof(buf), "%s:external-linkset",
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| 165 | (char *) xlink->prefix);
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| 166 | buf[sizeof(buf) - 1] = 0;
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| 167 | if (xmlStrEqual(role, buf))
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| 168 | ret = XLINK_TYPE_EXTENDED_SET;
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| 169 |
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| 170 | }
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| 171 |
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| 172 | }
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| 173 | ret = XLINK_TYPE_EXTENDED;
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| 174 | }
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| 175 | }
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| 176 |
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| 177 | if (type != NULL) xmlFree(type);
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| 178 | if (role != NULL) xmlFree(role);
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| 179 | return(ret);
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| 180 | }
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| 181 | #endif /* LIBXML_XPTR_ENABLED */
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| 182 | #define bottom_xlink
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| 183 | #include "elfgcchack.h"
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