Require strict base64 in data URI

As the tests already show, the data URI wrapper is supposed to fail
for corrupt input, but for some reason, one case of invalid input is
still allowed to pass?! Strict base64 makes a lot more sense here.
Also, Chromium and Firefox fail on invalid base64, so it's a logical
choice for PHP as well.

Author: Metabolix

ext/standard/tests/file/stream_rfc2397_006.phpt

@@ -26,7 +26,9 @@ NULL
 
 Warning: file_get_contents() expects parameter 1 to be a valid path, string given in %s line %d
 NULL
-string(13) "foobar foobar"
+
+Warning: file_get_contents(data:;base64,#Zm9vYmFyIGZvb2Jhcg==): failed to open stream: rfc2397: unable to decode in %sstream_rfc2397_006.php on line %d
+bool(false)
 
 Warning: file_get_contents(data:;base64,#Zm9vYmFyIGZvb2Jhc=): failed to open stream: rfc2397: unable to decode in %sstream_rfc2397_006.php on line %d
 bool(false)

main/streams/memory.c

@@ -720,7 +720,7 @@ static php_stream * php_stream_url_wrap_rfc2397(php_stream_wrapper *wrapper, con
 	dlen--;
 
 	if (base64) {
-		base64_comma = php_base64_decode((const unsigned char *)comma, dlen);
+		base64_comma = php_base64_decode_ex((const unsigned char *)comma, dlen, 1);
 		if (!base64_comma) {
 			zval_ptr_dtor(&meta);
 			php_stream_wrapper_log_error(wrapper, options, "rfc2397: unable to decode");