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|
/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Niels Dossche <nielsdos@php.net> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "php.h"
#if defined(HAVE_LIBXML) && defined(HAVE_DOM)
#include "php_dom.h"
#include "private_data.h"
#include "internal_helpers.h"
static void php_dom_libxml_private_data_destroy(php_libxml_private_data_header *header)
{
php_dom_private_data_destroy((php_dom_private_data *) header);
}
static void php_dom_libxml_private_data_ns_hook(php_libxml_private_data_header *header, xmlNodePtr node)
{
php_dom_remove_templated_content((php_dom_private_data *) header, node);
}
php_libxml_private_data_header *php_dom_libxml_private_data_header(php_dom_private_data *private_data)
{
return private_data == NULL ? NULL : &private_data->header;
}
php_dom_libxml_ns_mapper *php_dom_ns_mapper_from_private(php_dom_private_data *private_data)
{
return private_data == NULL ? NULL : &private_data->ns_mapper;
}
php_dom_private_data *php_dom_private_data_create(void)
{
php_dom_private_data *private_data = emalloc(sizeof(*private_data));
private_data->header.dtor = php_dom_libxml_private_data_destroy;
private_data->header.ns_hook = php_dom_libxml_private_data_ns_hook;
private_data->ns_mapper.html_ns = NULL;
private_data->ns_mapper.prefixless_xmlns_ns = NULL;
zend_hash_init(&private_data->ns_mapper.uri_to_prefix_map, 0, NULL, ZVAL_PTR_DTOR, false);
private_data->template_fragments = NULL;
return private_data;
}
void php_dom_private_data_destroy(php_dom_private_data *data)
{
zend_hash_destroy(&data->ns_mapper.uri_to_prefix_map);
if (data->template_fragments != NULL) {
xmlNodePtr node;
ZEND_HASH_MAP_FOREACH_PTR(data->template_fragments, node) {
xmlFreeNode(node);
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(data->template_fragments);
FREE_HASHTABLE(data->template_fragments);
}
efree(data);
}
static void php_dom_free_templated_content(php_dom_private_data *private_data, xmlNodePtr base)
{
/* Note: it's not possible to obtain a userland reference to these yet, so we can just free them without worrying
* about their proxies.
* Note 2: it's possible to have nested template content. */
if (zend_hash_num_elements(private_data->template_fragments) > 0) {
/* There's more templated content, try to free it. */
xmlNodePtr current = base->children;
while (current != NULL) {
if (current->type == XML_ELEMENT_NODE) {
php_dom_remove_templated_content(private_data, current);
}
current = php_dom_next_in_tree_order(current, base);
}
}
xmlFreeNode(base);
}
void php_dom_add_templated_content(php_dom_private_data *private_data, const xmlNode *template_node, xmlNodePtr fragment)
{
if (private_data->template_fragments == NULL) {
ALLOC_HASHTABLE(private_data->template_fragments);
zend_hash_init(private_data->template_fragments, 0, NULL, NULL, false);
zend_hash_real_init_mixed(private_data->template_fragments);
}
zend_hash_index_add_new_ptr(private_data->template_fragments, dom_mangle_pointer_for_key(template_node), fragment);
}
xmlNodePtr php_dom_retrieve_templated_content(php_dom_private_data *private_data, const xmlNode *template_node)
{
if (private_data->template_fragments == NULL) {
return NULL;
}
return zend_hash_index_find_ptr(private_data->template_fragments, dom_mangle_pointer_for_key(template_node));
}
xmlNodePtr php_dom_ensure_templated_content(php_dom_private_data *private_data, xmlNodePtr template_node)
{
xmlNodePtr result = php_dom_retrieve_templated_content(private_data, template_node);
if (result == NULL) {
result = xmlNewDocFragment(template_node->doc);
if (EXPECTED(result != NULL)) {
result->parent = template_node;
dom_add_element_ns_hook(private_data, template_node);
php_dom_add_templated_content(private_data, template_node, result);
}
}
return result;
}
void php_dom_remove_templated_content(php_dom_private_data *private_data, const xmlNode *template_node)
{
if (private_data->template_fragments != NULL) {
/* Deletion needs to be done not via a destructor because we can't access private_data from there. */
zval *zv = zend_hash_index_find(private_data->template_fragments, dom_mangle_pointer_for_key(template_node));
if (zv != NULL) {
xmlNodePtr node = Z_PTR_P(zv);
ZEND_ASSERT(offsetof(Bucket, val) == 0 && "Type cast only works if this is true");
Bucket* bucket = (Bucket*) zv;
/* First remove it from the bucket before freeing the content, otherwise recursion could make the bucket
* pointer invalid due to hash table structure changes. */
zend_hash_del_bucket(private_data->template_fragments, bucket);
php_dom_free_templated_content(private_data, node);
}
}
}
uint32_t php_dom_get_template_count(const php_dom_private_data *private_data)
{
if (private_data->template_fragments != NULL) {
return zend_hash_num_elements(private_data->template_fragments);
} else {
return 0;
}
}
void dom_add_element_ns_hook(php_dom_private_data *private_data, xmlNodePtr element)
{
xmlNsPtr ns = pemalloc(sizeof(*ns), true);
/* The private data is a tagged data structure where only tag 1 is defined by ext/libxml to register a hook. */
memset(ns, 0, sizeof(*ns));
ns->prefix = xmlStrdup(element->ns->prefix);
ns->href = xmlStrdup(element->ns->href);
ns->type = XML_LOCAL_NAMESPACE;
ns->_private = (void *) ((uintptr_t) private_data | LIBXML_NS_TAG_HOOK);
element->ns = ns;
php_libxml_set_old_ns(element->doc, ns);
}
#endif /* HAVE_LIBXML && HAVE_DOM */
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