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archived-php-src/ext/dom/characterdata.c
Niels Dossche b3a4a6b1e1 Resolve TODOs in ext/dom around nullable content (#14999) 
It's indeed possible this is NULL. When you create a new text-like node
in libxml and pass NULL as content, you do get NULL in the content field
instead of the empty string. You can hit this by creating DOMText or
DOMComment directly and not passing any argument. This could also be
created internally.
We refactor the code such that this detail is hidden and we add a test
to check that it correctly throws an exception.
2024-07-18 00:05:40 +02:00

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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: Christian Stocker <chregu@php.net> |
| Rob Richards <rrichards@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 "dom_properties.h"
/*
* class DOMCharacterData extends DOMNode
*
* URL: https://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-FF21A306
* Since:
*/
/* For some peculiar reason, many of these methods operate on unsigned numbers.
* Unfortunately, "old DOM" doesn't, so we have to conditionally convert...
* And the reason we're using "unsigned int" instead of "unsigned zend_long" is because libxml2 internally works with ints. */
static bool dom_convert_number_unsigned(dom_object *intern, zend_long input, unsigned int *output)
{
if (input < 0) {
if (php_dom_follow_spec_intern(intern)) {
*output = (unsigned int) input;
} else {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
return false;
}
} else {
*output = input;
}
return true;
}
/* {{{ data string
readonly=no
URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-72AB8359
Since:
*/
zend_result dom_characterdata_data_read(dom_object *obj, zval *retval)
{
DOM_PROP_NODE(xmlNodePtr, nodep, obj);
php_dom_get_content_into_zval(nodep, retval, false);
return SUCCESS;
}
zend_result dom_characterdata_data_write(dom_object *obj, zval *newval)
{
DOM_PROP_NODE(xmlNodePtr, nodep, obj);
/* Typed property, this is already a string */
ZEND_ASSERT(Z_TYPE_P(newval) == IS_STRING);
zend_string *str = Z_STR_P(newval);
xmlNodeSetContentLen(nodep, BAD_CAST ZSTR_VAL(str), ZSTR_LEN(str));
return SUCCESS;
}
/* }}} */
/* {{{ length long
readonly=yes
URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-7D61178C
Since:
*/
zend_result dom_characterdata_length_read(dom_object *obj, zval *retval)
{
DOM_PROP_NODE(xmlNodePtr, nodep, obj);
long length = 0;
if (nodep->content) {
length = xmlUTF8Strlen(nodep->content);
}
ZVAL_LONG(retval, length);
return SUCCESS;
}
/* }}} */
/* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-6531BCCF
Modern spec URL: https://dom.spec.whatwg.org/#dom-characterdata-substringdata
Since:
*/
PHP_METHOD(DOMCharacterData, substringData)
{
zval *id;
xmlChar *substring;
xmlNodePtr node;
zend_long offset_input, count_input;
unsigned int count, offset;
int length;
dom_object *intern;
id = ZEND_THIS;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &offset_input, &count_input) == FAILURE) {
RETURN_THROWS();
}
DOM_GET_OBJ(node, id, xmlNodePtr, intern);
const xmlChar *cur = php_dom_get_content_or_empty(node);
length = xmlUTF8Strlen(cur);
if (ZEND_LONG_INT_OVFL(offset_input) || ZEND_LONG_INT_OVFL(count_input)) {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
RETURN_FALSE;
}
if (!dom_convert_number_unsigned(intern, offset_input, &offset) || !dom_convert_number_unsigned(intern, count_input, &count)) {
RETURN_FALSE;
}
if (offset > (unsigned int)length) {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
RETURN_FALSE;
}
if (count > length - offset) {
count = length - offset;
}
substring = xmlUTF8Strsub(cur, (int)offset, (int)count);
if (substring) {
RETVAL_STRING((char *) substring);
xmlFree(substring);
} else {
RETVAL_EMPTY_STRING();
}
}
/* }}} end dom_characterdata_substring_data */
/* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-32791A2F
Modern spec URL: https://dom.spec.whatwg.org/#dom-characterdata-appenddata
Since:
*/
static void dom_character_data_append_data(INTERNAL_FUNCTION_PARAMETERS, bool return_true)
{
zval *id;
xmlNode *nodep;
dom_object *intern;
char *arg;
size_t arg_len;
id = ZEND_THIS;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &arg, &arg_len) == FAILURE) {
RETURN_THROWS();
}
DOM_GET_OBJ(nodep, id, xmlNodePtr, intern);
xmlTextConcat(nodep, BAD_CAST arg, arg_len);
if (return_true) {
RETURN_TRUE;
}
}
PHP_METHOD(DOMCharacterData, appendData)
{
dom_character_data_append_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, true);
}
PHP_METHOD(Dom_CharacterData, appendData)
{
dom_character_data_append_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, false);
}
/* }}} end dom_characterdata_append_data */
/* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-3EDB695F
Modern spec URL: https://dom.spec.whatwg.org/#dom-characterdata-insertdata
Since:
*/
static void dom_character_data_insert_data(INTERNAL_FUNCTION_PARAMETERS, bool return_true)
{
zval *id;
xmlChar *first, *second;
xmlNodePtr node;
char *arg;
zend_long offset_input;
unsigned int offset;
int length;
size_t arg_len;
dom_object *intern;
id = ZEND_THIS;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "ls", &offset_input, &arg, &arg_len) == FAILURE) {
RETURN_THROWS();
}
DOM_GET_OBJ(node, id, xmlNodePtr, intern);
const xmlChar *cur = php_dom_get_content_or_empty(node);
length = xmlUTF8Strlen(cur);
if (ZEND_LONG_INT_OVFL(offset_input)) {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
RETURN_FALSE;
}
if (!dom_convert_number_unsigned(intern, offset_input, &offset)) {
RETURN_FALSE;
}
if (offset > (unsigned int)length) {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
RETURN_FALSE;
}
first = xmlUTF8Strndup(cur, (int)offset);
second = xmlUTF8Strsub(cur, (int)offset, length - (int)offset);
xmlNodeSetContent(node, first);
xmlNodeAddContent(node, BAD_CAST arg);
xmlNodeAddContent(node, second);
xmlFree(first);
xmlFree(second);
if (return_true) {
RETURN_TRUE;
}
}
PHP_METHOD(DOMCharacterData, insertData)
{
dom_character_data_insert_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, true);
}
PHP_METHOD(Dom_CharacterData, insertData)
{
dom_character_data_insert_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, false);
}
/* }}} end dom_characterdata_insert_data */
/* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-7C603781
Modern spec URL: https://dom.spec.whatwg.org/#dom-characterdata-deletedata
Since:
*/
static void dom_character_data_delete_data(INTERNAL_FUNCTION_PARAMETERS, bool return_true)
{
zval *id;
xmlChar *substring, *second;
xmlNodePtr node;
zend_long offset, count_input;
unsigned int count;
int length;
dom_object *intern;
id = ZEND_THIS;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &offset, &count_input) == FAILURE) {
RETURN_THROWS();
}
DOM_GET_OBJ(node, id, xmlNodePtr, intern);
const xmlChar *cur = php_dom_get_content_or_empty(node);
length = xmlUTF8Strlen(cur);
if (offset < 0 || ZEND_LONG_INT_OVFL(offset) || ZEND_LONG_INT_OVFL(count_input) || offset > length) {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
RETURN_FALSE;
}
if (!dom_convert_number_unsigned(intern, count_input, &count)) {
RETURN_FALSE;
}
if (offset > 0) {
substring = xmlUTF8Strsub(cur, 0, (int)offset);
} else {
substring = NULL;
}
if (count > length - offset) {
count = length - offset;
}
second = xmlUTF8Strsub(cur, (int)offset + (int)count, length - (int)offset);
substring = xmlStrcat(substring, second);
xmlNodeSetContent(node, substring);
xmlFree(second);
xmlFree(substring);
if (return_true) {
RETURN_TRUE;
}
}
PHP_METHOD(DOMCharacterData, deleteData)
{
dom_character_data_delete_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, true);
}
PHP_METHOD(Dom_CharacterData, deleteData)
{
dom_character_data_delete_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, false);
}
/* }}} end dom_characterdata_delete_data */
/* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-E5CBA7FB
Modern spec URL: https://dom.spec.whatwg.org/#dom-characterdata-replacedata
Since:
*/
static void dom_character_data_replace_data(INTERNAL_FUNCTION_PARAMETERS, bool return_true)
{
zval *id;
xmlChar *substring, *second = NULL;
xmlNodePtr node;
char *arg;
zend_long offset, count_input;
unsigned int count;
int length;
size_t arg_len;
dom_object *intern;
id = ZEND_THIS;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "lls", &offset, &count_input, &arg, &arg_len) == FAILURE) {
RETURN_THROWS();
}
DOM_GET_OBJ(node, id, xmlNodePtr, intern);
const xmlChar *cur = php_dom_get_content_or_empty(node);
length = xmlUTF8Strlen(cur);
if (offset < 0 || ZEND_LONG_INT_OVFL(offset) || ZEND_LONG_INT_OVFL(count_input) || offset > length) {
php_dom_throw_error(INDEX_SIZE_ERR, dom_get_strict_error(intern->document));
RETURN_FALSE;
}
if (!dom_convert_number_unsigned(intern, count_input, &count)) {
RETURN_FALSE;
}
if (offset > 0) {
substring = xmlUTF8Strsub(cur, 0, (int)offset);
} else {
substring = NULL;
}
if (count > length - offset) {
count = length - offset;
}
if (offset < length) {
second = xmlUTF8Strsub(cur, (int)offset + count, length - (int)offset);
}
substring = xmlStrcat(substring, BAD_CAST arg);
substring = xmlStrcat(substring, second);
xmlNodeSetContent(node, substring);
if (second) {
xmlFree(second);
}
xmlFree(substring);
if (return_true) {
RETURN_TRUE;
}
}
PHP_METHOD(DOMCharacterData, replaceData)
{
dom_character_data_replace_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, true);
}
PHP_METHOD(Dom_CharacterData, replaceData)
{
dom_character_data_replace_data(INTERNAL_FUNCTION_PARAM_PASSTHRU, false);
}
/* }}} end dom_characterdata_replace_data */
#endif
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