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✏️ Editing: xml.c

/*
   +----------------------------------------------------------------------+
   | 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: Stig Sæther Bakken <ssb@php.net>                            |
   |          Thies C. Arntzen <thies@thieso.net>                         |
   |          Sterling Hughes <sterling@php.net>                          |
   +----------------------------------------------------------------------+
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"

#include "zend_variables.h"
#include "ext/standard/info.h"
#include "ext/standard/html.h"

#ifdef HAVE_XML

#include "php_xml.h"
# include "ext/standard/head.h"
#ifdef LIBXML_EXPAT_COMPAT
#include "ext/libxml/php_libxml.h"
#endif

#include "xml_arginfo.h"

/* Short-term TODO list:
 * - Implement XML_ExternalEntityParserCreate()
 * - XML_SetCommentHandler
 * - XML_SetCdataSectionHandler
 * - XML_SetParamEntityParsing
 */

/* Long-term TODO list:
 * - Fix the expat library so you can install your own memory manager
 *   functions
 */

/* Known bugs:
 * - Weird things happen with <![CDATA[]]> sections.
 */

ZEND_BEGIN_MODULE_GLOBALS(xml)
	XML_Char *default_encoding;
ZEND_END_MODULE_GLOBALS(xml)

ZEND_DECLARE_MODULE_GLOBALS(xml)

#define XML(v) ZEND_MODULE_GLOBALS_ACCESSOR(xml, v)

typedef struct {
	int case_folding;
	XML_Parser parser;
	XML_Char *target_encoding;

/* Reference to the object itself, for convenience.
	 * It is not owned, do not release it. */
	zval index;

/* We return a pointer to these zvals in get_gc(), so it's
	 * important that a) they are adjacent b) object is the first
	 * and c) the number of zvals is kept up to date. */
#define XML_PARSER_NUM_ZVALS 12
	zval object;
	zval startElementHandler;
	zval endElementHandler;
	zval characterDataHandler;
	zval processingInstructionHandler;
	zval defaultHandler;
	zval unparsedEntityDeclHandler;
	zval notationDeclHandler;
	zval externalEntityRefHandler;
	zval unknownEncodingHandler;
	zval startNamespaceDeclHandler;
	zval endNamespaceDeclHandler;

zend_function *startElementPtr;
	zend_function *endElementPtr;
	zend_function *characterDataPtr;
	zend_function *processingInstructionPtr;
	zend_function *defaultPtr;
	zend_function *unparsedEntityDeclPtr;
	zend_function *notationDeclPtr;
	zend_function *externalEntityRefPtr;
	zend_function *unknownEncodingPtr;
	zend_function *startNamespaceDeclPtr;
	zend_function *endNamespaceDeclPtr;

zval data;
	zval info;
	int level;
	int toffset;
	int curtag;
	zval *ctag;
	char **ltags;
	int lastwasopen;
	int skipwhite;
	int isparsing;

XML_Char *baseURI;

zend_object std;
} xml_parser;

typedef struct {
	XML_Char *name;
	char (*decoding_function)(unsigned short);
	unsigned short (*encoding_function)(unsigned char);
} xml_encoding;

/* {{{ dynamically loadable module stuff */
#ifdef COMPILE_DL_XML
#ifdef ZTS
ZEND_TSRMLS_CACHE_DEFINE()
#endif
ZEND_GET_MODULE(xml)
#endif /* COMPILE_DL_XML */
/* }}} */

#define XML_MAXLEVEL 255 /* XXX this should be dynamic */

#define SKIP_TAGSTART(str) ((str) + (parser->toffset > (int)strlen(str) ? strlen(str) : parser->toffset))

static zend_class_entry *xml_parser_ce;
static zend_object_handlers xml_parser_object_handlers;

/* {{{ function prototypes */
PHP_MINIT_FUNCTION(xml);
PHP_MINFO_FUNCTION(xml);
static PHP_GINIT_FUNCTION(xml);

static zend_object *xml_parser_create_object(zend_class_entry *class_type);
static void xml_parser_free_obj(zend_object *object);
static HashTable *xml_parser_get_gc(zend_object *object, zval **table, int *n);
static zend_function *xml_parser_get_constructor(zend_object *object);

static zend_string *xml_utf8_decode(const XML_Char *, size_t, const XML_Char *);
static void xml_set_handler(zval *, zval *);
inline static unsigned short xml_encode_iso_8859_1(unsigned char);
inline static char xml_decode_iso_8859_1(unsigned short);
inline static unsigned short xml_encode_us_ascii(unsigned char);
inline static char xml_decode_us_ascii(unsigned short);
static void xml_call_handler(xml_parser *, zval *, zend_function *, int, zval *, zval *);
static void _xml_xmlchar_zval(const XML_Char *, int, const XML_Char *, zval *);
static int _xml_xmlcharlen(const XML_Char *);
static void _xml_add_to_info(xml_parser *parser, const char *name);
inline static zend_string *_xml_decode_tag(xml_parser *parser, const XML_Char *tag);

void _xml_startElementHandler(void *, const XML_Char *, const XML_Char **);
void _xml_endElementHandler(void *, const XML_Char *);
void _xml_characterDataHandler(void *, const XML_Char *, int);
void _xml_processingInstructionHandler(void *, const XML_Char *, const XML_Char *);
void _xml_defaultHandler(void *, const XML_Char *, int);
void _xml_unparsedEntityDeclHandler(void *, const XML_Char *, const XML_Char *, const XML_Char *, const XML_Char *, const XML_Char *);
void _xml_notationDeclHandler(void *, const XML_Char *, const XML_Char *, const XML_Char *, const XML_Char *);
int  _xml_externalEntityRefHandler(XML_Parser, const XML_Char *, const XML_Char *, const XML_Char *, const XML_Char *);

void _xml_startNamespaceDeclHandler(void *, const XML_Char *, const XML_Char *);
void _xml_endNamespaceDeclHandler(void *, const XML_Char *);
/* }}} */

#ifdef LIBXML_EXPAT_COMPAT
static const zend_module_dep xml_deps[] = {
	ZEND_MOD_REQUIRED("libxml")
	ZEND_MOD_END
};
#endif

zend_module_entry xml_module_entry = {
#ifdef LIBXML_EXPAT_COMPAT
	STANDARD_MODULE_HEADER_EX, NULL,
	xml_deps,
#else
	STANDARD_MODULE_HEADER,
#endif
	"xml",                /* extension name */
	ext_functions,        /* extension function list */
	PHP_MINIT(xml),       /* extension-wide startup function */
	NULL,                 /* extension-wide shutdown function */
	NULL,                 /* per-request startup function */
	NULL,                 /* per-request shutdown function */
	PHP_MINFO(xml),       /* information function */
	PHP_XML_VERSION,
	PHP_MODULE_GLOBALS(xml), /* globals descriptor */
	PHP_GINIT(xml),          /* globals ctor */
	NULL,                    /* globals dtor */
	NULL,                    /* post deactivate */
	STANDARD_MODULE_PROPERTIES_EX
};

/* All the encoding functions are set to NULL right now, since all
 * the encoding is currently done internally by expat/xmltok.
 */
const xml_encoding xml_encodings[] = {
	{ (XML_Char *)"ISO-8859-1", xml_decode_iso_8859_1, xml_encode_iso_8859_1 },
	{ (XML_Char *)"US-ASCII",   xml_decode_us_ascii,   xml_encode_us_ascii   },
	{ (XML_Char *)"UTF-8",      NULL,                  NULL                  },
	{ (XML_Char *)NULL,         NULL,                  NULL                  }
};

static XML_Memory_Handling_Suite php_xml_mem_hdlrs;

/* }}} */

/* {{{ startup, shutdown and info functions */
static PHP_GINIT_FUNCTION(xml)
{
#if defined(COMPILE_DL_XML) && defined(ZTS)
	ZEND_TSRMLS_CACHE_UPDATE();
#endif
	xml_globals->default_encoding = (XML_Char*)"UTF-8";
}

static void *php_xml_malloc_wrapper(size_t sz)
{
	return emalloc(sz);
}

static void *php_xml_realloc_wrapper(void *ptr, size_t sz)
{
	return erealloc(ptr, sz);
}

static void php_xml_free_wrapper(void *ptr)
{
	if (ptr != NULL) {
		efree(ptr);
	}
}

PHP_MINIT_FUNCTION(xml)
{
	xml_parser_ce = register_class_XMLParser();
	xml_parser_ce->create_object = xml_parser_create_object;

memcpy(&xml_parser_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));
	xml_parser_object_handlers.offset = XtOffsetOf(xml_parser, std);
	xml_parser_object_handlers.free_obj = xml_parser_free_obj;
	xml_parser_object_handlers.get_gc = xml_parser_get_gc;
	xml_parser_object_handlers.get_constructor = xml_parser_get_constructor;
	xml_parser_object_handlers.clone_obj = NULL;
	xml_parser_object_handlers.compare = zend_objects_not_comparable;

register_xml_symbols(module_number);

/* this object should not be pre-initialised at compile time,
	   as the order of members may vary */

php_xml_mem_hdlrs.malloc_fcn = php_xml_malloc_wrapper;
	php_xml_mem_hdlrs.realloc_fcn = php_xml_realloc_wrapper;
	php_xml_mem_hdlrs.free_fcn = php_xml_free_wrapper;

#ifdef LIBXML_EXPAT_COMPAT
	REGISTER_STRING_CONSTANT("XML_SAX_IMPL", "libxml", CONST_CS|CONST_PERSISTENT);
#else
	REGISTER_STRING_CONSTANT("XML_SAX_IMPL", "expat", CONST_CS|CONST_PERSISTENT);
#endif

return SUCCESS;
}

PHP_MINFO_FUNCTION(xml)
{
	php_info_print_table_start();
	php_info_print_table_row(2, "XML Support", "active");
	php_info_print_table_row(2, "XML Namespace Support", "active");
#if defined(LIBXML_DOTTED_VERSION) && defined(LIBXML_EXPAT_COMPAT)
	php_info_print_table_row(2, "libxml2 Version", LIBXML_DOTTED_VERSION);
#else
	php_info_print_table_row(2, "EXPAT Version", XML_ExpatVersion());
#endif
	php_info_print_table_end();
}
/* }}} */

/* {{{ extension-internal functions */

static void _xml_xmlchar_zval(const XML_Char *s, int len, const XML_Char *encoding, zval *ret)
{
	if (s == NULL) {
		ZVAL_FALSE(ret);
		return;
	}
	if (len == 0) {
		len = _xml_xmlcharlen(s);
	}
	ZVAL_STR(ret, xml_utf8_decode(s, len, encoding));
}
/* }}} */

static inline xml_parser *xml_parser_from_obj(zend_object *obj) {
	return (xml_parser *)((char *)(obj) - XtOffsetOf(xml_parser, std));
}

#define Z_XMLPARSER_P(zv) xml_parser_from_obj(Z_OBJ_P(zv))

static zend_object *xml_parser_create_object(zend_class_entry *class_type) {
	xml_parser *intern = zend_object_alloc(sizeof(xml_parser), class_type);
	memset(intern, 0, sizeof(xml_parser) - sizeof(zend_object));

zend_object_std_init(&intern->std, class_type);
	object_properties_init(&intern->std, class_type);
	intern->std.handlers = &xml_parser_object_handlers;

return &intern->std;
}

static void xml_parser_free_obj(zend_object *object)
{
	xml_parser *parser = xml_parser_from_obj(object);

if (parser->parser) {
		XML_ParserFree(parser->parser);
	}
	if (parser->ltags) {
		int inx;
		for (inx = 0; ((inx < parser->level) && (inx < XML_MAXLEVEL)); inx++)
			efree(parser->ltags[ inx ]);
		efree(parser->ltags);
	}
	if (!Z_ISUNDEF(parser->startElementHandler)) {
		zval_ptr_dtor(&parser->startElementHandler);
	}
	if (!Z_ISUNDEF(parser->endElementHandler)) {
		zval_ptr_dtor(&parser->endElementHandler);
	}
	if (!Z_ISUNDEF(parser->characterDataHandler)) {
		zval_ptr_dtor(&parser->characterDataHandler);
	}
	if (!Z_ISUNDEF(parser->processingInstructionHandler)) {
		zval_ptr_dtor(&parser->processingInstructionHandler);
	}
	if (!Z_ISUNDEF(parser->defaultHandler)) {
		zval_ptr_dtor(&parser->defaultHandler);
	}
	if (!Z_ISUNDEF(parser->unparsedEntityDeclHandler)) {
		zval_ptr_dtor(&parser->unparsedEntityDeclHandler);
	}
	if (!Z_ISUNDEF(parser->notationDeclHandler)) {
		zval_ptr_dtor(&parser->notationDeclHandler);
	}
	if (!Z_ISUNDEF(parser->externalEntityRefHandler)) {
		zval_ptr_dtor(&parser->externalEntityRefHandler);
	}
	if (!Z_ISUNDEF(parser->unknownEncodingHandler)) {
		zval_ptr_dtor(&parser->unknownEncodingHandler);
	}
	if (!Z_ISUNDEF(parser->startNamespaceDeclHandler)) {
		zval_ptr_dtor(&parser->startNamespaceDeclHandler);
	}
	if (!Z_ISUNDEF(parser->endNamespaceDeclHandler)) {
		zval_ptr_dtor(&parser->endNamespaceDeclHandler);
	}
	if (parser->baseURI) {
		efree(parser->baseURI);
	}
	if (!Z_ISUNDEF(parser->object)) {
		zval_ptr_dtor(&parser->object);
	}

zend_object_std_dtor(&parser->std);
}

static HashTable *xml_parser_get_gc(zend_object *object, zval **table, int *n)
{
	xml_parser *parser = xml_parser_from_obj(object);
	*table = &parser->object;
	*n = XML_PARSER_NUM_ZVALS;
	return zend_std_get_properties(object);
}

static zend_function *xml_parser_get_constructor(zend_object *object) {
	zend_throw_error(NULL, "Cannot directly construct XMLParser, use xml_parser_create() or xml_parser_create_ns() instead");
	return NULL;
}

/* {{{ xml_set_handler() */
static void xml_set_handler(zval *handler, zval *data)
{
	/* If we have already a handler, release it */
	if (handler) {
		zval_ptr_dtor(handler);
	}

/* IS_ARRAY might indicate that we're using array($obj, 'method') syntax */
	if (Z_TYPE_P(data) != IS_ARRAY && Z_TYPE_P(data) != IS_OBJECT) {
		convert_to_string(data);
		if (Z_STRLEN_P(data) == 0) {
			ZVAL_UNDEF(handler);
			return;
		}
	}

ZVAL_COPY(handler, data);
}
/* }}} */

/* {{{ xml_call_handler() */
static void xml_call_handler(xml_parser *parser, zval *handler, zend_function *function_ptr, int argc, zval *argv, zval *retval)
{
	int i;

ZVAL_UNDEF(retval);
	if (parser && handler && !EG(exception)) {
		int result;
		zend_fcall_info fci;

fci.size = sizeof(fci);
		ZVAL_COPY_VALUE(&fci.function_name, handler);
		fci.object = Z_OBJ(parser->object);
		fci.retval = retval;
		fci.param_count = argc;
		fci.params = argv;
		fci.named_params = NULL;

result = zend_call_function(&fci, NULL);
		if (result == FAILURE) {
			zval *method;
			zval *obj;

if (Z_TYPE_P(handler) == IS_STRING) {
				php_error_docref(NULL, E_WARNING, "Unable to call handler %s()", Z_STRVAL_P(handler));
			} else if (Z_TYPE_P(handler) == IS_ARRAY &&
					   (obj = zend_hash_index_find(Z_ARRVAL_P(handler), 0)) != NULL &&
					   (method = zend_hash_index_find(Z_ARRVAL_P(handler), 1)) != NULL &&
					   Z_TYPE_P(obj) == IS_OBJECT &&
					   Z_TYPE_P(method) == IS_STRING) {
				php_error_docref(NULL, E_WARNING, "Unable to call handler %s::%s()", ZSTR_VAL(Z_OBJCE_P(obj)->name), Z_STRVAL_P(method));
			} else
				php_error_docref(NULL, E_WARNING, "Unable to call handler");
		}
	}
	for (i = 0; i < argc; i++) {
		zval_ptr_dtor(&argv[i]);
	}
}
/* }}} */

/* {{{ xml_encode_iso_8859_1() */
inline static unsigned short xml_encode_iso_8859_1(unsigned char c)
{
	return (unsigned short)c;
}
/* }}} */

/* {{{ xml_decode_iso_8859_1() */
inline static char xml_decode_iso_8859_1(unsigned short c)
{
	return (char)(c > 0xff ? '?' : c);
}
/* }}} */

/* {{{ xml_encode_us_ascii() */
inline static unsigned short xml_encode_us_ascii(unsigned char c)
{
	return (unsigned short)c;
}
/* }}} */

/* {{{ xml_decode_us_ascii() */
inline static char xml_decode_us_ascii(unsigned short c)
{
	return (char)(c > 0x7f ? '?' : c);
}
/* }}} */

/* {{{ xml_get_encoding() */
static const xml_encoding *xml_get_encoding(const XML_Char *name)
{
	const xml_encoding *enc = &xml_encodings[0];

while (enc && enc->name) {
		if (strcasecmp((char *)name, (char *)enc->name) == 0) {
			return enc;
		}
		enc++;
	}
	return NULL;
}
/* }}} */

/* {{{ xml_utf8_decode() */
static zend_string *xml_utf8_decode(const XML_Char *s, size_t len, const XML_Char *encoding)
{
	size_t pos = 0;
	unsigned int c;
	char (*decoder)(unsigned short) = NULL;
	const xml_encoding *enc = xml_get_encoding(encoding);
	zend_string *str;

if (enc) {
		decoder = enc->decoding_function;
	}

if (decoder == NULL) {
		/* If the target encoding was unknown, or no decoder function
		 * was specified, return the UTF-8-encoded data as-is.
		 */
		str = zend_string_init((char *)s, len, 0);
		return str;
	}

str = zend_string_alloc(len, 0);
	ZSTR_LEN(str) = 0;
	while (pos < len) {
		zend_result status = FAILURE;
		c = php_next_utf8_char((const unsigned char*)s, len, &pos, &status);

if (status == FAILURE || c > 0xFFU) {
			c = '?';
		}

ZSTR_VAL(str)[ZSTR_LEN(str)++] = decoder ? (unsigned int)decoder(c) : c;
	}
	ZSTR_VAL(str)[ZSTR_LEN(str)] = '\0';
	if (ZSTR_LEN(str) < len) {
		str = zend_string_truncate(str, ZSTR_LEN(str), 0);
	}

return str;
}
/* }}} */

/* {{{ _xml_xmlcharlen() */
static int _xml_xmlcharlen(const XML_Char *s)
{
	int len = 0;

while (*s) {
		len++;
		s++;
	}
	return len;
}
/* }}} */

/* {{{ _xml_add_to_info() */
static void _xml_add_to_info(xml_parser *parser, const char *name)
{
	zval *element;

if (Z_ISUNDEF(parser->info)) {
		return;
	}

size_t name_len = strlen(name);
	if ((element = zend_hash_str_find(Z_ARRVAL(parser->info), name, name_len)) == NULL) {
		zval values;
		array_init(&values);
		element = zend_hash_str_update(Z_ARRVAL(parser->info), name, name_len, &values);
	}

add_next_index_long(element, parser->curtag);

parser->curtag++;
}
/* }}} */

/* {{{ _xml_decode_tag() */
static zend_string *_xml_decode_tag(xml_parser *parser, const XML_Char *tag)
{
	zend_string *str;

str = xml_utf8_decode(tag, _xml_xmlcharlen(tag), parser->target_encoding);

if (parser->case_folding) {
		zend_str_toupper(ZSTR_VAL(str), ZSTR_LEN(str));
	}

return str;
}
/* }}} */

/* {{{ _xml_startElementHandler() */
void _xml_startElementHandler(void *userData, const XML_Char *name, const XML_Char **attributes)
{
	xml_parser *parser = (xml_parser *)userData;
	const char **attrs = (const char **) attributes;
	zend_string *att, *tag_name, *val;
	zval retval, args[3];

if (!parser) {
		return;
	}

parser->level++;

tag_name = _xml_decode_tag(parser, name);

if (!Z_ISUNDEF(parser->startElementHandler)) {
		ZVAL_COPY(&args[0], &parser->index);
		ZVAL_STRING(&args[1], SKIP_TAGSTART(ZSTR_VAL(tag_name)));
		array_init(&args[2]);

while (attributes && *attributes) {
			zval tmp;

att = _xml_decode_tag(parser, attributes[0]);
			val = xml_utf8_decode(attributes[1], strlen((char *)attributes[1]), parser->target_encoding);

ZVAL_STR(&tmp, val);
			zend_symtable_update(Z_ARRVAL(args[2]), att, &tmp);

attributes += 2;

zend_string_release_ex(att, 0);
		}

xml_call_handler(parser, &parser->startElementHandler, parser->startElementPtr, 3, args, &retval);
		zval_ptr_dtor(&retval);
	}

if (!Z_ISUNDEF(parser->data)) {
		if (parser->level <= XML_MAXLEVEL)  {
			zval tag, atr;
			int atcnt = 0;

array_init(&tag);
			array_init(&atr);

_xml_add_to_info(parser, ZSTR_VAL(tag_name) + parser->toffset);

add_assoc_string(&tag, "tag", SKIP_TAGSTART(ZSTR_VAL(tag_name))); /* cast to avoid gcc-warning */
			add_assoc_string(&tag, "type", "open");
			add_assoc_long(&tag, "level", parser->level);

parser->ltags[parser->level-1] = estrdup(ZSTR_VAL(tag_name));
			parser->lastwasopen = 1;

attributes = (const XML_Char **) attrs;

while (attributes && *attributes) {
				zval tmp;

att = _xml_decode_tag(parser, attributes[0]);
				val = xml_utf8_decode(attributes[1], strlen((char *)attributes[1]), parser->target_encoding);

ZVAL_STR(&tmp, val);
				zend_symtable_update(Z_ARRVAL(atr), att, &tmp);

atcnt++;
				attributes += 2;

zend_string_release_ex(att, 0);
			}

if (atcnt) {
				zend_hash_str_add(Z_ARRVAL(tag), "attributes", sizeof("attributes") - 1, &atr);
			} else {
				zval_ptr_dtor(&atr);
			}

parser->ctag = zend_hash_next_index_insert(Z_ARRVAL(parser->data), &tag);
		} else if (parser->level == (XML_MAXLEVEL + 1)) {
						php_error_docref(NULL, E_WARNING, "Maximum depth exceeded - Results truncated");
		}
	}

zend_string_release_ex(tag_name, 0);
}
/* }}} */

/* {{{ _xml_endElementHandler() */
void _xml_endElementHandler(void *userData, const XML_Char *name)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser) {
		return;
	}

zval retval, args[2];

zend_string *tag_name = _xml_decode_tag(parser, name);

if (!Z_ISUNDEF(parser->endElementHandler)) {
		ZVAL_COPY(&args[0], &parser->index);
		ZVAL_STRING(&args[1], SKIP_TAGSTART(ZSTR_VAL(tag_name)));

xml_call_handler(parser, &parser->endElementHandler, parser->endElementPtr, 2, args, &retval);
		zval_ptr_dtor(&retval);
	}

if (!Z_ISUNDEF(parser->data)) {
		zval tag;

if (parser->lastwasopen) {
			add_assoc_string(parser->ctag, "type", "complete");
		} else {
			array_init(&tag);

_xml_add_to_info(parser, ZSTR_VAL(tag_name) + parser->toffset);

add_assoc_string(&tag, "tag", SKIP_TAGSTART(ZSTR_VAL(tag_name))); /* cast to avoid gcc-warning */
			add_assoc_string(&tag, "type", "close");
			add_assoc_long(&tag, "level", parser->level);

zend_hash_next_index_insert(Z_ARRVAL(parser->data), &tag);
		}

parser->lastwasopen = 0;
	}

zend_string_release_ex(tag_name, 0);

if ((parser->ltags) && (parser->level <= XML_MAXLEVEL)) {
		efree(parser->ltags[parser->level-1]);
	}

parser->level--;
}
/* }}} */

/* {{{ _xml_characterDataHandler() */
void _xml_characterDataHandler(void *userData, const XML_Char *s, int len)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser) {
		return;
	}

zval retval, args[2];

if (!Z_ISUNDEF(parser->characterDataHandler)) {
		ZVAL_COPY(&args[0], &parser->index);
		_xml_xmlchar_zval(s, len, parser->target_encoding, &args[1]);
		xml_call_handler(parser, &parser->characterDataHandler, parser->characterDataPtr, 2, args, &retval);
		zval_ptr_dtor(&retval);
	}

if (Z_ISUNDEF(parser->data)) {
		return;
	}

bool doprint = 0;
	zend_string *decoded_value;
	decoded_value = xml_utf8_decode(s, len, parser->target_encoding);
	if (parser->skipwhite) {
		for (size_t i = 0; i < ZSTR_LEN(decoded_value); i++) {
			switch (ZSTR_VAL(decoded_value)[i]) {
				case ' ':
				case '\t':
				case '\n':
					continue;
				default:
					doprint = 1;
					break;
			}
			if (doprint) {
				break;
			}
		}
	}
	if (parser->lastwasopen) {
		zval *myval;
		/* check if the current tag already has a value - if yes append to that! */
		if ((myval = zend_hash_str_find(Z_ARRVAL_P(parser->ctag), "value", sizeof("value") - 1))) {
			size_t newlen = Z_STRLEN_P(myval) + ZSTR_LEN(decoded_value);
			Z_STR_P(myval) = zend_string_extend(Z_STR_P(myval), newlen, 0);
			strncpy(Z_STRVAL_P(myval) + Z_STRLEN_P(myval) - ZSTR_LEN(decoded_value),
					ZSTR_VAL(decoded_value), ZSTR_LEN(decoded_value) + 1);
			zend_string_release_ex(decoded_value, 0);
		} else {
			if (doprint || (! parser->skipwhite)) {
				add_assoc_str(parser->ctag, "value", decoded_value);
			} else {
				zend_string_release_ex(decoded_value, 0);
			}
		}
	} else {
		zval tag;
		zval *curtag, *mytype, *myval;
		ZEND_HASH_REVERSE_FOREACH_VAL(Z_ARRVAL(parser->data), curtag) {
			if ((mytype = zend_hash_str_find(Z_ARRVAL_P(curtag),"type", sizeof("type") - 1))) {
				if (zend_string_equals_literal(Z_STR_P(mytype), "cdata")) {
					if ((myval = zend_hash_str_find(Z_ARRVAL_P(curtag), "value", sizeof("value") - 1))) {
						size_t newlen = Z_STRLEN_P(myval) + ZSTR_LEN(decoded_value);
						Z_STR_P(myval) = zend_string_extend(Z_STR_P(myval), newlen, 0);
						strncpy(Z_STRVAL_P(myval) + Z_STRLEN_P(myval) - ZSTR_LEN(decoded_value),
								ZSTR_VAL(decoded_value), ZSTR_LEN(decoded_value) + 1);
						zend_string_release_ex(decoded_value, 0);
						return;
					}
				}
			}
			break;
		} ZEND_HASH_FOREACH_END();
		if (parser->level <= XML_MAXLEVEL && parser->level > 0 && (doprint || (! parser->skipwhite))) {
			array_init(&tag);
			_xml_add_to_info(parser,SKIP_TAGSTART(parser->ltags[parser->level-1]));
			add_assoc_string(&tag, "tag", SKIP_TAGSTART(parser->ltags[parser->level-1]));
			add_assoc_str(&tag, "value", decoded_value);
			add_assoc_string(&tag, "type", "cdata");
			add_assoc_long(&tag, "level", parser->level);
			zend_hash_next_index_insert(Z_ARRVAL(parser->data), &tag);
		} else if (parser->level == (XML_MAXLEVEL + 1)) {
								php_error_docref(NULL, E_WARNING, "Maximum depth exceeded - Results truncated");
		} else {
			zend_string_release_ex(decoded_value, 0);
		}
	}
}
/* }}} */

/* {{{ _xml_processingInstructionHandler() */
void _xml_processingInstructionHandler(void *userData, const XML_Char *target, const XML_Char *data)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser || Z_ISUNDEF(parser->processingInstructionHandler)) {
		return;
	}

zval retval, args[3];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(target, 0, parser->target_encoding, &args[1]);
	_xml_xmlchar_zval(data, 0, parser->target_encoding, &args[2]);
	xml_call_handler(parser, &parser->processingInstructionHandler, parser->processingInstructionPtr, 3, args, &retval);
	zval_ptr_dtor(&retval);
}
/* }}} */

/* {{{ _xml_defaultHandler() */
void _xml_defaultHandler(void *userData, const XML_Char *s, int len)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser || Z_ISUNDEF(parser->defaultHandler)) {
		return;
	}

zval retval, args[2];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(s, len, parser->target_encoding, &args[1]);
	xml_call_handler(parser, &parser->defaultHandler, parser->defaultPtr, 2, args, &retval);
	zval_ptr_dtor(&retval);
}
/* }}} */

/* {{{ _xml_unparsedEntityDeclHandler() */
void _xml_unparsedEntityDeclHandler(void *userData,
	const XML_Char *entityName, const XML_Char *base, const XML_Char *systemId,
	const XML_Char *publicId, const XML_Char *notationName)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser || Z_ISUNDEF(parser->unparsedEntityDeclHandler)) {
		return;
	}

zval retval, args[6];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(entityName, 0, parser->target_encoding, &args[1]);
	_xml_xmlchar_zval(base, 0, parser->target_encoding, &args[2]);
	_xml_xmlchar_zval(systemId, 0, parser->target_encoding, &args[3]);
	_xml_xmlchar_zval(publicId, 0, parser->target_encoding, &args[4]);
	_xml_xmlchar_zval(notationName, 0, parser->target_encoding, &args[5]);
	xml_call_handler(parser, &parser->unparsedEntityDeclHandler, parser->unparsedEntityDeclPtr, 6, args, &retval);
	zval_ptr_dtor(&retval);
}
/* }}} */

/* {{{ _xml_notationDeclHandler() */
void _xml_notationDeclHandler(void *userData, const XML_Char *notationName,
	const XML_Char *base, const XML_Char *systemId, const XML_Char *publicId)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser || Z_ISUNDEF(parser->notationDeclHandler)) {
		return;
	}

zval retval, args[5];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(notationName, 0, parser->target_encoding, &args[1]);
	_xml_xmlchar_zval(base, 0, parser->target_encoding, &args[2]);
	_xml_xmlchar_zval(systemId, 0, parser->target_encoding, &args[3]);
	_xml_xmlchar_zval(publicId, 0, parser->target_encoding, &args[4]);
	xml_call_handler(parser, &parser->notationDeclHandler, parser->notationDeclPtr, 5, args, &retval);
	zval_ptr_dtor(&retval);
}
/* }}} */

/* {{{ _xml_externalEntityRefHandler() */
int _xml_externalEntityRefHandler(XML_Parser parserPtr, const XML_Char *openEntityNames,
	const XML_Char *base, const XML_Char *systemId, const XML_Char *publicId)
{
	xml_parser *parser = XML_GetUserData(parserPtr);

if (!parser || Z_ISUNDEF(parser->externalEntityRefHandler)) {
		return 0;
	}

int ret = 0; /* abort if no handler is set (should be configurable?) */
	zval retval, args[5];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(openEntityNames, 0, parser->target_encoding, &args[1]);
	_xml_xmlchar_zval(base, 0, parser->target_encoding, &args[2]);
	_xml_xmlchar_zval(systemId, 0, parser->target_encoding, &args[3]);
	_xml_xmlchar_zval(publicId, 0, parser->target_encoding, &args[4]);
	xml_call_handler(parser, &parser->externalEntityRefHandler, parser->externalEntityRefPtr, 5, args, &retval);
	if (!Z_ISUNDEF(retval)) {
		convert_to_long(&retval);
		ret = Z_LVAL(retval);
	} else {
		ret = 0;
	}

return ret;
}
/* }}} */

/* {{{ _xml_startNamespaceDeclHandler() */
void _xml_startNamespaceDeclHandler(void *userData,const XML_Char *prefix, const XML_Char *uri)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser || Z_ISUNDEF(parser->startNamespaceDeclHandler)) {
		return;
	}

zval retval, args[3];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(prefix, 0, parser->target_encoding, &args[1]);
	_xml_xmlchar_zval(uri, 0, parser->target_encoding, &args[2]);
	xml_call_handler(parser, &parser->startNamespaceDeclHandler, parser->startNamespaceDeclPtr, 3, args, &retval);
	zval_ptr_dtor(&retval);
}
/* }}} */

/* {{{ _xml_endNamespaceDeclHandler() */
void _xml_endNamespaceDeclHandler(void *userData, const XML_Char *prefix)
{
	xml_parser *parser = (xml_parser *)userData;

if (!parser || Z_ISUNDEF(parser->endNamespaceDeclHandler)) {
		return;
	}

zval retval, args[2];

ZVAL_COPY(&args[0], &parser->index);
	_xml_xmlchar_zval(prefix, 0, parser->target_encoding, &args[1]);
	xml_call_handler(parser, &parser->endNamespaceDeclHandler, parser->endNamespaceDeclPtr, 2, args, &retval);
	zval_ptr_dtor(&retval);
}
/* }}} */

/************************* EXTENSION FUNCTIONS *************************/

static void php_xml_parser_create_impl(INTERNAL_FUNCTION_PARAMETERS, int ns_support) /* {{{ */
{
	xml_parser *parser;
	int auto_detect = 0;

zend_string *encoding_param = NULL;

char *ns_param = NULL;
	size_t ns_param_len = 0;

XML_Char *encoding;

if (zend_parse_parameters(ZEND_NUM_ARGS(), (ns_support ? "|S!s": "|S!"), &encoding_param, &ns_param, &ns_param_len) == FAILURE) {
		RETURN_THROWS();
	}

if (encoding_param != NULL) {
		/* The supported encoding types are hardcoded here because
		 * we are limited to the encodings supported by expat/xmltok.
		 */
		if (ZSTR_LEN(encoding_param) == 0) {
			encoding = XML(default_encoding);
			auto_detect = 1;
		} else if (zend_string_equals_literal_ci(encoding_param, "ISO-8859-1")) {
			encoding = (XML_Char*)"ISO-8859-1";
		} else if (zend_string_equals_literal_ci(encoding_param, "UTF-8")) {
			encoding = (XML_Char*)"UTF-8";
		} else if (zend_string_equals_literal_ci(encoding_param, "US-ASCII")) {
			encoding = (XML_Char*)"US-ASCII";
		} else {
			zend_argument_value_error(1, "is not a supported source encoding");
			RETURN_THROWS();
		}
	} else {
		encoding = XML(default_encoding);
	}

if (ns_support && ns_param == NULL){
		ns_param = ":";
	}

object_init_ex(return_value, xml_parser_ce);
	parser = Z_XMLPARSER_P(return_value);
	parser->parser = XML_ParserCreate_MM((auto_detect ? NULL : encoding),
	                                     &php_xml_mem_hdlrs, (XML_Char*)ns_param);

parser->target_encoding = encoding;
	parser->case_folding = 1;
	parser->isparsing = 0;

XML_SetUserData(parser->parser, parser);
	ZVAL_COPY_VALUE(&parser->index, return_value);
}
/* }}} */

/* {{{ Create an XML parser */
PHP_FUNCTION(xml_parser_create)
{
	php_xml_parser_create_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/* {{{ Create an XML parser */
PHP_FUNCTION(xml_parser_create_ns)
{
	php_xml_parser_create_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

/* {{{ Set up object which should be used for callbacks */
PHP_FUNCTION(xml_set_object)
{
	xml_parser *parser;
	zval *pind, *mythis;

if (zend_parse_parameters(ZEND_NUM_ARGS(), "Oo", &pind, xml_parser_ce, &mythis) == FAILURE) {
		RETURN_THROWS();
	}

parser = Z_XMLPARSER_P(pind);

zval_ptr_dtor(&parser->object);
	ZVAL_OBJ_COPY(&parser->object, Z_OBJ_P(mythis));

RETURN_TRUE;
}
/* }}} */

/* {{{ Set up start and end element handlers */
PHP_FUNCTION(xml_set_element_handler)
{
	xml_parser *parser;
	zval *pind, *shdl, *ehdl;

if (zend_parse_parameters(ZEND_NUM_ARGS(), "Ozz", &pind, xml_parser_ce, &shdl, &ehdl) == FAILURE) {
		RETURN_THROWS();
	}

parser = Z_XMLPARSER_P(pind);
	xml_set_handler(&parser->startElementHandler, shdl);
	xml_set_handler(&parser->endElementHandler, ehdl);
	XML_SetElementHandler(parser->parser, _xml_startElementHandler, _xml_endElementHandler);

RETURN_TRUE;
}
/* }}} */

/* {{{ Set up character data handler */
PHP_FUNCTION(xml_set_character_data_handler)
{
	xml_parser *parser;
	zval *pind, *hdl;