+typedef size_t (*php_http_buffer_pass_func_t)(void *opaque, char *, size_t TSRMLS_DC);
+
+PHP_HTTP_BUFFER_API ssize_t php_http_buffer_passthru(php_http_buffer_t **s, size_t chunk_size, php_http_buffer_pass_func_t passin, void *passin_arg, php_http_buffer_pass_func_t passon, void *passon_arg TSRMLS_DC);