Function xmlXPathNodeValHash

ThirdParty/libxml2/vtklibxml2/xpath.c:5307–5409

* xmlXPathNodeValHash: * @node: a node pointer * * Function computing the beginning of the string value of the node, * used to speed up comparisons * * Returns an int usable as a hash */

 * Returns an int usable as a hash
 */
static unsigned int
xmlXPathNodeValHash(xmlNodePtr node) {
    int len = 2;
    const xmlChar * string = NULL;
    xmlNodePtr tmp = NULL;
    unsigned int ret = 0;

    if (node == NULL)
	return(0);

    if (node->type == XML_DOCUMENT_NODE) {
	tmp = xmlDocGetRootElement((xmlDocPtr) node);
	if (tmp == NULL)
	    node = node->children;
	else
	    node = tmp;

	if (node == NULL)
	    return(0);
    }

    switch (node->type) {
	case XML_COMMENT_NODE:
	case XML_PI_NODE:
	case XML_CDATA_SECTION_NODE:
	case XML_TEXT_NODE:
	    string = node->content;
	    if (string == NULL)
		return(0);
	    if (string[0] == 0)
		return(0);
	    return(string[0] + (string[1] << 8));
	case XML_NAMESPACE_DECL:
	    string = ((xmlNsPtr)node)->href;
	    if (string == NULL)
		return(0);
	    if (string[0] == 0)
		return(0);
	    return(string[0] + (string[1] << 8));
	case XML_ATTRIBUTE_NODE:
	    tmp = ((xmlAttrPtr) node)->children;
	    break;
	case XML_ELEMENT_NODE:
	    tmp = node->children;
	    break;
	default:
	    return(0);
    }
    while (tmp != NULL) {
	switch (tmp->type) {
	    case XML_CDATA_SECTION_NODE:
	    case XML_TEXT_NODE:
		string = tmp->content;
		break;
	    default:
                string = NULL;
		break;
	}