1 /*
2    +----------------------------------------------------------------------+
3    | PHP Version 7                                                        |
4    +----------------------------------------------------------------------+
5    | Copyright (c) The PHP Group                                          |
6    +----------------------------------------------------------------------+
7    | This source file is subject to version 3.01 of the PHP license,      |
8    | that is bundled with this package in the file LICENSE, and is        |
9    | available through the world-wide-web at the following url:           |
10    | http://www.php.net/license/3_01.txt                                  |
11    | If you did not receive a copy of the PHP license and are unable to   |
12    | obtain it through the world-wide-web, please send a note to          |
13    | license@php.net so we can mail you a copy immediately.               |
14    +----------------------------------------------------------------------+
15    | Authors:                                                             |
16    | Wez Furlong (wez@thebrainroom.com)                                   |
17    | Sara Golemon (pollita@php.net)                                       |
18    +----------------------------------------------------------------------+
19 */
20 
21 #include "php.h"
22 #include "php_globals.h"
23 #include "ext/standard/basic_functions.h"
24 #include "ext/standard/file.h"
25 
26 #define PHP_STREAM_BRIGADE_RES_NAME	"userfilter.bucket brigade"
27 #define PHP_STREAM_BUCKET_RES_NAME "userfilter.bucket"
28 #define PHP_STREAM_FILTER_RES_NAME "userfilter.filter"
29 
30 struct php_user_filter_data {
31 	zend_class_entry *ce;
32 	/* variable length; this *must* be last in the structure */
33 	zend_string *classname;
34 };
35 
36 /* to provide context for calling into the next filter from user-space */
37 static int le_userfilters;
38 static int le_bucket_brigade;
39 static int le_bucket;
40 
41 /* define the base filter class */
42 
PHP_FUNCTIONnull43 PHP_FUNCTION(user_filter_nop)
44 {
45 }
46 ZEND_BEGIN_ARG_INFO(arginfo_php_user_filter_filter, 0)
47 	ZEND_ARG_INFO(0, in)
48 	ZEND_ARG_INFO(0, out)
49 	ZEND_ARG_INFO(1, consumed)
50 	ZEND_ARG_INFO(0, closing)
51 ZEND_END_ARG_INFO()
52 
53 ZEND_BEGIN_ARG_INFO(arginfo_php_user_filter_onCreate, 0)
54 ZEND_END_ARG_INFO()
55 
56 ZEND_BEGIN_ARG_INFO(arginfo_php_user_filter_onClose, 0)
57 ZEND_END_ARG_INFO()
58 
59 static const zend_function_entry user_filter_class_funcs[] = {
60 	PHP_NAMED_FE(filter,	PHP_FN(user_filter_nop),		arginfo_php_user_filter_filter)
61 	PHP_NAMED_FE(onCreate,	PHP_FN(user_filter_nop),		arginfo_php_user_filter_onCreate)
62 	PHP_NAMED_FE(onClose,	PHP_FN(user_filter_nop),		arginfo_php_user_filter_onClose)
63 	PHP_FE_END
64 };
65 
66 static zend_class_entry user_filter_class_entry;
67 
ZEND_RSRC_DTOR_FUNCnull68 static ZEND_RSRC_DTOR_FUNC(php_bucket_dtor)
69 {
70 	php_stream_bucket *bucket = (php_stream_bucket *)res->ptr;
71 	if (bucket) {
72 		php_stream_bucket_delref(bucket);
73 		bucket = NULL;
74 	}
75 }
76 
PHP_MINIT_FUNCTIONnull77 PHP_MINIT_FUNCTION(user_filters)
78 {
79 	zend_class_entry *php_user_filter;
80 	/* init the filter class ancestor */
81 	INIT_CLASS_ENTRY(user_filter_class_entry, "php_user_filter", user_filter_class_funcs);
82 	if ((php_user_filter = zend_register_internal_class(&user_filter_class_entry)) == NULL) {
83 		return FAILURE;
84 	}
85 	zend_declare_property_string(php_user_filter, "filtername", sizeof("filtername")-1, "", ZEND_ACC_PUBLIC);
86 	zend_declare_property_string(php_user_filter, "params", sizeof("params")-1, "", ZEND_ACC_PUBLIC);
87 
88 	/* init the filter resource; it has no dtor, as streams will always clean it up
89 	 * at the correct time */
90 	le_userfilters = zend_register_list_destructors_ex(NULL, NULL, PHP_STREAM_FILTER_RES_NAME, 0);
91 
92 	if (le_userfilters == FAILURE) {
93 		return FAILURE;
94 	}
95 
96 	/* Filters will dispose of their brigades */
97 	le_bucket_brigade = zend_register_list_destructors_ex(NULL, NULL, PHP_STREAM_BRIGADE_RES_NAME, module_number);
98 	/* Brigades will dispose of their buckets */
99 	le_bucket = zend_register_list_destructors_ex(php_bucket_dtor, NULL, PHP_STREAM_BUCKET_RES_NAME, module_number);
100 
101 	if (le_bucket_brigade == FAILURE) {
102 		return FAILURE;
103 	}
104 
105 	REGISTER_LONG_CONSTANT("PSFS_PASS_ON",			PSFS_PASS_ON,			CONST_CS | CONST_PERSISTENT);
106 	REGISTER_LONG_CONSTANT("PSFS_FEED_ME",			PSFS_FEED_ME,			CONST_CS | CONST_PERSISTENT);
107 	REGISTER_LONG_CONSTANT("PSFS_ERR_FATAL",		PSFS_ERR_FATAL,			CONST_CS | CONST_PERSISTENT);
108 
109 	REGISTER_LONG_CONSTANT("PSFS_FLAG_NORMAL",		PSFS_FLAG_NORMAL,		CONST_CS | CONST_PERSISTENT);
110 	REGISTER_LONG_CONSTANT("PSFS_FLAG_FLUSH_INC",	PSFS_FLAG_FLUSH_INC,	CONST_CS | CONST_PERSISTENT);
111 	REGISTER_LONG_CONSTANT("PSFS_FLAG_FLUSH_CLOSE",	PSFS_FLAG_FLUSH_CLOSE,	CONST_CS | CONST_PERSISTENT);
112 
113 	return SUCCESS;
114 }
115 
PHP_RSHUTDOWN_FUNCTIONnull116 PHP_RSHUTDOWN_FUNCTION(user_filters)
117 {
118 	if (BG(user_filter_map)) {
119 		zend_hash_destroy(BG(user_filter_map));
120 		efree(BG(user_filter_map));
121 		BG(user_filter_map) = NULL;
122 	}
123 
124 	return SUCCESS;
125 }
126 
userfilter_dtor(php_stream_filter *thisfilter)127 static void userfilter_dtor(php_stream_filter *thisfilter)
128 {
129 	zval *obj = &thisfilter->abstract;
130 	zval func_name;
131 	zval retval;
132 
133 	if (obj == NULL) {
134 		/* If there's no object associated then there's nothing to dispose of */
135 		return;
136 	}
137 
138 	ZVAL_STRINGL(&func_name, "onclose", sizeof("onclose")-1);
139 
140 	call_user_function(NULL,
141 			obj,
142 			&func_name,
143 			&retval,
144 			0, NULL);
145 
146 	zval_ptr_dtor(&retval);
147 	zval_ptr_dtor(&func_name);
148 
149 	/* kill the object */
150 	zval_ptr_dtor(obj);
151 }
152 
userfilter_filter( php_stream *stream, php_stream_filter *thisfilter, php_stream_bucket_brigade *buckets_in, php_stream_bucket_brigade *buckets_out, size_t *bytes_consumed, int flags )153 php_stream_filter_status_t userfilter_filter(
154 			php_stream *stream,
155 			php_stream_filter *thisfilter,
156 			php_stream_bucket_brigade *buckets_in,
157 			php_stream_bucket_brigade *buckets_out,
158 			size_t *bytes_consumed,
159 			int flags
160 			)
161 {
162 	int ret = PSFS_ERR_FATAL;
163 	zval *obj = &thisfilter->abstract;
164 	zval func_name;
165 	zval retval;
166 	zval args[4];
167 	zval zpropname;
168 	int call_result;
169 
170 	/* the userfilter object probably doesn't exist anymore */
171 	if (CG(unclean_shutdown)) {
172 		return ret;
173 	}
174 
175 	if (!zend_hash_str_exists_ind(Z_OBJPROP_P(obj), "stream", sizeof("stream")-1)) {
176 		zval tmp;
177 
178 		/* Give the userfilter class a hook back to the stream */
179 		php_stream_to_zval(stream, &tmp);
180 		Z_ADDREF(tmp);
181 		add_property_zval(obj, "stream", &tmp);
182 		/* add_property_zval increments the refcount which is unwanted here */
183 		zval_ptr_dtor(&tmp);
184 	}
185 
186 	ZVAL_STRINGL(&func_name, "filter", sizeof("filter")-1);
187 
188 	/* Setup calling arguments */
189 	ZVAL_RES(&args[0], zend_register_resource(buckets_in, le_bucket_brigade));
190 	ZVAL_RES(&args[1], zend_register_resource(buckets_out, le_bucket_brigade));
191 
192 	if (bytes_consumed) {
193 		ZVAL_LONG(&args[2], *bytes_consumed);
194 	} else {
195 		ZVAL_NULL(&args[2]);
196 	}
197 
198 	ZVAL_BOOL(&args[3], flags & PSFS_FLAG_FLUSH_CLOSE);
199 
200 	call_result = call_user_function_ex(NULL,
201 			obj,
202 			&func_name,
203 			&retval,
204 			4, args,
205 			0, NULL);
206 
207 	zval_ptr_dtor(&func_name);
208 
209 	if (call_result == SUCCESS && Z_TYPE(retval) != IS_UNDEF) {
210 		convert_to_long(&retval);
211 		ret = (int)Z_LVAL(retval);
212 	} else if (call_result == FAILURE) {
213 		php_error_docref(NULL, E_WARNING, "failed to call filter function");
214 	}
215 
216 	if (bytes_consumed) {
217 		*bytes_consumed = zval_get_long(&args[2]);
218 	}
219 
220 	if (buckets_in->head) {
221 		php_stream_bucket *bucket = buckets_in->head;
222 
223 		php_error_docref(NULL, E_WARNING, "Unprocessed filter buckets remaining on input brigade");
224 		while ((bucket = buckets_in->head)) {
225 			/* Remove unconsumed buckets from the brigade */
226 			php_stream_bucket_unlink(bucket);
227 			php_stream_bucket_delref(bucket);
228 		}
229 	}
230 	if (ret != PSFS_PASS_ON) {
231 		php_stream_bucket *bucket = buckets_out->head;
232 		while (bucket != NULL) {
233 			php_stream_bucket_unlink(bucket);
234 			php_stream_bucket_delref(bucket);
235 			bucket = buckets_out->head;
236 		}
237 	}
238 
239 	/* filter resources are cleaned up by the stream destructor,
240 	 * keeping a reference to the stream resource here would prevent it
241 	 * from being destroyed properly */
242 	ZVAL_STRINGL(&zpropname, "stream", sizeof("stream")-1);
243 	Z_OBJ_HANDLER_P(obj, unset_property)(obj, &zpropname, NULL);
244 	zval_ptr_dtor(&zpropname);
245 
246 	zval_ptr_dtor(&args[3]);
247 	zval_ptr_dtor(&args[2]);
248 	zval_ptr_dtor(&args[1]);
249 	zval_ptr_dtor(&args[0]);
250 
251 	return ret;
252 }
253 
254 static const php_stream_filter_ops userfilter_ops = {
255 	userfilter_filter,
256 	userfilter_dtor,
257 	"user-filter"
258 };
259 
user_filter_factory_create(const char *filtername, zval *filterparams, uint8_t persistent)260 static php_stream_filter *user_filter_factory_create(const char *filtername,
261 		zval *filterparams, uint8_t persistent)
262 {
263 	struct php_user_filter_data *fdat = NULL;
264 	php_stream_filter *filter;
265 	zval obj, zfilter;
266 	zval func_name;
267 	zval retval;
268 	size_t len;
269 
270 	/* some sanity checks */
271 	if (persistent) {
272 		php_error_docref(NULL, E_WARNING,
273 				"cannot use a user-space filter with a persistent stream");
274 		return NULL;
275 	}
276 
277 	len = strlen(filtername);
278 
279 	/* determine the classname/class entry */
280 	if (NULL == (fdat = zend_hash_str_find_ptr(BG(user_filter_map), (char*)filtername, len))) {
281 		char *period;
282 
283 		/* Userspace Filters using ambiguous wildcards could cause problems.
284            i.e.: myfilter.foo.bar will always call into myfilter.foo.*
285                  never seeing myfilter.*
286            TODO: Allow failed userfilter creations to continue
287                  scanning through the list */
288 		if ((period = strrchr(filtername, '.'))) {
289 			char *wildcard = safe_emalloc(len, 1, 3);
290 
291 			/* Search for wildcard matches instead */
292 			memcpy(wildcard, filtername, len + 1); /* copy \0 */
293 			period = wildcard + (period - filtername);
294 			while (period) {
295 				ZEND_ASSERT(period[0] == '.');
296 				period[1] = '*';
297 				period[2] = '\0';
298 				if (NULL != (fdat = zend_hash_str_find_ptr(BG(user_filter_map), wildcard, strlen(wildcard)))) {
299 					period = NULL;
300 				} else {
301 					*period = '\0';
302 					period = strrchr(wildcard, '.');
303 				}
304 			}
305 			efree(wildcard);
306 		}
307 		if (fdat == NULL) {
308 			php_error_docref(NULL, E_WARNING,
309 					"Err, filter \"%s\" is not in the user-filter map, but somehow the user-filter-factory was invoked for it!?", filtername);
310 			return NULL;
311 		}
312 	}
313 
314 	/* bind the classname to the actual class */
315 	if (fdat->ce == NULL) {
316 		if (NULL == (fdat->ce = zend_lookup_class(fdat->classname))) {
317 			php_error_docref(NULL, E_WARNING,
318 					"user-filter \"%s\" requires class \"%s\", but that class is not defined",
319 					filtername, ZSTR_VAL(fdat->classname));
320 			return NULL;
321 		}
322 	}
323 
324 	/* create the object */
325 	if (object_init_ex(&obj, fdat->ce) == FAILURE) {
326 		return NULL;
327 	}
328 
329 	filter = php_stream_filter_alloc(&userfilter_ops, NULL, 0);
330 	if (filter == NULL) {
331 		zval_ptr_dtor(&obj);
332 		return NULL;
333 	}
334 
335 	/* filtername */
336 	add_property_string(&obj, "filtername", (char*)filtername);
337 
338 	/* and the parameters, if any */
339 	if (filterparams) {
340 		add_property_zval(&obj, "params", filterparams);
341 	} else {
342 		add_property_null(&obj, "params");
343 	}
344 
345 	/* invoke the constructor */
346 	ZVAL_STRINGL(&func_name, "oncreate", sizeof("oncreate")-1);
347 
348 	call_user_function(NULL,
349 			&obj,
350 			&func_name,
351 			&retval,
352 			0, NULL);
353 
354 	if (Z_TYPE(retval) != IS_UNDEF) {
355 		if (Z_TYPE(retval) == IS_FALSE) {
356 			/* User reported filter creation error "return false;" */
357 			zval_ptr_dtor(&retval);
358 
359 			/* Kill the filter (safely) */
360 			ZVAL_UNDEF(&filter->abstract);
361 			php_stream_filter_free(filter);
362 
363 			/* Kill the object */
364 			zval_ptr_dtor(&obj);
365 
366 			/* Report failure to filter_alloc */
367 			return NULL;
368 		}
369 		zval_ptr_dtor(&retval);
370 	}
371 	zval_ptr_dtor(&func_name);
372 
373 	/* set the filter property, this will be used during cleanup */
374 	ZVAL_RES(&zfilter, zend_register_resource(filter, le_userfilters));
375 	ZVAL_OBJ(&filter->abstract, Z_OBJ(obj));
376 	add_property_zval(&obj, "filter", &zfilter);
377 	/* add_property_zval increments the refcount which is unwanted here */
378 	zval_ptr_dtor(&zfilter);
379 
380 	return filter;
381 }
382 
383 static const php_stream_filter_factory user_filter_factory = {
384 	user_filter_factory_create
385 };
386 
filter_item_dtor(zval *zv)387 static void filter_item_dtor(zval *zv)
388 {
389 	struct php_user_filter_data *fdat = Z_PTR_P(zv);
390 	zend_string_release_ex(fdat->classname, 0);
391 	efree(fdat);
392 }
393 
394 /* {{{ proto object stream_bucket_make_writeable(resource brigade)
395    Return a bucket object from the brigade for operating on */
PHP_FUNCTIONnull396 PHP_FUNCTION(stream_bucket_make_writeable)
397 {
398 	zval *zbrigade, zbucket;
399 	php_stream_bucket_brigade *brigade;
400 	php_stream_bucket *bucket;
401 
402 	ZEND_PARSE_PARAMETERS_START(1, 1)
403 		Z_PARAM_RESOURCE(zbrigade)
404 	ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
405 
406 	if ((brigade = (php_stream_bucket_brigade*)zend_fetch_resource(
407 					Z_RES_P(zbrigade), PHP_STREAM_BRIGADE_RES_NAME, le_bucket_brigade)) == NULL) {
408 		RETURN_FALSE;
409 	}
410 
411 	ZVAL_NULL(return_value);
412 
413 	if (brigade->head && (bucket = php_stream_bucket_make_writeable(brigade->head))) {
414 		ZVAL_RES(&zbucket, zend_register_resource(bucket, le_bucket));
415 		object_init(return_value);
416 		add_property_zval(return_value, "bucket", &zbucket);
417 		/* add_property_zval increments the refcount which is unwanted here */
418 		zval_ptr_dtor(&zbucket);
419 		add_property_stringl(return_value, "data", bucket->buf, bucket->buflen);
420 		add_property_long(return_value, "datalen", bucket->buflen);
421 	}
422 }
423 /* }}} */
424 
425 /* {{{ php_stream_bucket_attach */
php_stream_bucket_attach(int append, INTERNAL_FUNCTION_PARAMETERS)426 static void php_stream_bucket_attach(int append, INTERNAL_FUNCTION_PARAMETERS)
427 {
428 	zval *zbrigade, *zobject;
429 	zval *pzbucket, *pzdata;
430 	php_stream_bucket_brigade *brigade;
431 	php_stream_bucket *bucket;
432 
433 	ZEND_PARSE_PARAMETERS_START(2, 2)
434 		Z_PARAM_RESOURCE(zbrigade)
435 		Z_PARAM_OBJECT(zobject)
436 	ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
437 
438 	if (NULL == (pzbucket = zend_hash_str_find(Z_OBJPROP_P(zobject), "bucket", sizeof("bucket")-1))) {
439 		php_error_docref(NULL, E_WARNING, "Object has no bucket property");
440 		RETURN_FALSE;
441 	}
442 
443 	if ((brigade = (php_stream_bucket_brigade*)zend_fetch_resource(
444 					Z_RES_P(zbrigade), PHP_STREAM_BRIGADE_RES_NAME, le_bucket_brigade)) == NULL) {
445 		RETURN_FALSE;
446 	}
447 
448 	if ((bucket = (php_stream_bucket *)zend_fetch_resource_ex(pzbucket, PHP_STREAM_BUCKET_RES_NAME, le_bucket)) == NULL) {
449 		RETURN_FALSE;
450 	}
451 
452 	if (NULL != (pzdata = zend_hash_str_find(Z_OBJPROP_P(zobject), "data", sizeof("data")-1)) && Z_TYPE_P(pzdata) == IS_STRING) {
453 		if (!bucket->own_buf) {
454 			bucket = php_stream_bucket_make_writeable(bucket);
455 		}
456 		if (bucket->buflen != Z_STRLEN_P(pzdata)) {
457 			bucket->buf = perealloc(bucket->buf, Z_STRLEN_P(pzdata), bucket->is_persistent);
458 			bucket->buflen = Z_STRLEN_P(pzdata);
459 		}
460 		memcpy(bucket->buf, Z_STRVAL_P(pzdata), bucket->buflen);
461 	}
462 
463 	if (append) {
464 		php_stream_bucket_append(brigade, bucket);
465 	} else {
466 		php_stream_bucket_prepend(brigade, bucket);
467 	}
468 	/* This is a hack necessary to accommodate situations where bucket is appended to the stream
469  	 * multiple times. See bug35916.phpt for reference.
470 	 */
471 	if (bucket->refcount == 1) {
472 		bucket->refcount++;
473 	}
474 }
475 /* }}} */
476 
477 /* {{{ proto void stream_bucket_prepend(resource brigade, object bucket)
478    Prepend bucket to brigade */
PHP_FUNCTIONnull479 PHP_FUNCTION(stream_bucket_prepend)
480 {
481 	php_stream_bucket_attach(0, INTERNAL_FUNCTION_PARAM_PASSTHRU);
482 }
483 /* }}} */
484 
485 /* {{{ proto void stream_bucket_append(resource brigade, object bucket)
486    Append bucket to brigade */
PHP_FUNCTIONnull487 PHP_FUNCTION(stream_bucket_append)
488 {
489 	php_stream_bucket_attach(1, INTERNAL_FUNCTION_PARAM_PASSTHRU);
490 }
491 /* }}} */
492 
493 /* {{{ proto resource stream_bucket_new(resource stream, string buffer)
494    Create a new bucket for use on the current stream */
PHP_FUNCTIONnull495 PHP_FUNCTION(stream_bucket_new)
496 {
497 	zval *zstream, zbucket;
498 	php_stream *stream;
499 	char *buffer;
500 	char *pbuffer;
501 	size_t buffer_len;
502 	php_stream_bucket *bucket;
503 
504 	ZEND_PARSE_PARAMETERS_START(2, 2)
505 		Z_PARAM_ZVAL(zstream)
506 		Z_PARAM_STRING(buffer, buffer_len)
507 	ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
508 
509 	php_stream_from_zval(stream, zstream);
510 
511 	pbuffer = pemalloc(buffer_len, php_stream_is_persistent(stream));
512 
513 	memcpy(pbuffer, buffer, buffer_len);
514 
515 	bucket = php_stream_bucket_new(stream, pbuffer, buffer_len, 1, php_stream_is_persistent(stream));
516 
517 	if (bucket == NULL) {
518 		RETURN_FALSE;
519 	}
520 
521 	ZVAL_RES(&zbucket, zend_register_resource(bucket, le_bucket));
522 	object_init(return_value);
523 	add_property_zval(return_value, "bucket", &zbucket);
524 	/* add_property_zval increments the refcount which is unwanted here */
525 	zval_ptr_dtor(&zbucket);
526 	add_property_stringl(return_value, "data", bucket->buf, bucket->buflen);
527 	add_property_long(return_value, "datalen", bucket->buflen);
528 }
529 /* }}} */
530 
531 /* {{{ proto array stream_get_filters(void)
532    Returns a list of registered filters */
PHP_FUNCTIONnull533 PHP_FUNCTION(stream_get_filters)
534 {
535 	zend_string *filter_name;
536 	HashTable *filters_hash;
537 
538 	if (zend_parse_parameters_none() == FAILURE) {
539 		return;
540 	}
541 
542 	array_init(return_value);
543 
544 	filters_hash = php_get_stream_filters_hash();
545 
546 	if (filters_hash) {
547 		ZEND_HASH_FOREACH_STR_KEY(filters_hash, filter_name) {
548 			if (filter_name) {
549 				add_next_index_str(return_value, zend_string_copy(filter_name));
550 			}
551 		} ZEND_HASH_FOREACH_END();
552 	}
553 	/* It's okay to return an empty array if no filters are registered */
554 }
555 /* }}} */
556 
557 /* {{{ proto bool stream_filter_register(string filtername, string classname)
558    Registers a custom filter handler class */
PHP_FUNCTIONnull559 PHP_FUNCTION(stream_filter_register)
560 {
561 	zend_string *filtername, *classname;
562 	struct php_user_filter_data *fdat;
563 
564 	ZEND_PARSE_PARAMETERS_START(2, 2)
565 		Z_PARAM_STR(filtername)
566 		Z_PARAM_STR(classname)
567 	ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
568 
569 	RETVAL_FALSE;
570 
571 	if (!ZSTR_LEN(filtername)) {
572 		php_error_docref(NULL, E_WARNING, "Filter name cannot be empty");
573 		return;
574 	}
575 
576 	if (!ZSTR_LEN(classname)) {
577 		php_error_docref(NULL, E_WARNING, "Class name cannot be empty");
578 		return;
579 	}
580 
581 	if (!BG(user_filter_map)) {
582 		BG(user_filter_map) = (HashTable*) emalloc(sizeof(HashTable));
583 		zend_hash_init(BG(user_filter_map), 8, NULL, (dtor_func_t) filter_item_dtor, 0);
584 	}
585 
586 	fdat = ecalloc(1, sizeof(struct php_user_filter_data));
587 	fdat->classname = zend_string_copy(classname);
588 
589 	if (zend_hash_add_ptr(BG(user_filter_map), filtername, fdat) != NULL &&
590 			php_stream_filter_register_factory_volatile(filtername, &user_filter_factory) == SUCCESS) {
591 		RETVAL_TRUE;
592 	} else {
593 		zend_string_release_ex(classname, 0);
594 		efree(fdat);
595 	}
596 }
597 /* }}} */
598