Added API to get file size when using file body handler

include/belle-sip/bodyhandler.h

@@ -86,9 +86,9 @@ BELLESIP_EXPORT belle_sip_user_body_handler_t *belle_sip_user_body_handler_new(
 #define BELLE_SIP_FILE_BODY_HANDLER(obj)	BELLE_SIP_CAST(obj, belle_sip_file_body_handler_t)
 
 BELLESIP_EXPORT belle_sip_file_body_handler_t *belle_sip_file_body_handler_new(const char *filepath, belle_sip_body_handler_progress_callback_t progress_cb, void *data);
+BELLESIP_EXPORT size_t belle_sip_file_body_handler_get_file_size(belle_sip_file_body_handler_t *file_bh);
 BELLESIP_EXPORT void belle_sip_file_body_handler_set_user_body_handler(belle_sip_file_body_handler_t *file_bh, belle_sip_user_body_handler_t *user_bh);
 
-
 /*
  * Multipart body handler
  */

src/bodyhandler.c

@@ -637,6 +637,10 @@ belle_sip_file_body_handler_t *belle_sip_file_body_handler_new(const char *filep
 	return obj;
 }
 
+size_t belle_sip_file_body_handler_get_file_size(belle_sip_file_body_handler_t *file_bh) {
+	return file_bh->base.expected_size;
+}
+
 void belle_sip_file_body_handler_set_user_body_handler(belle_sip_file_body_handler_t *file_bh, belle_sip_user_body_handler_t *user_bh) {
 	if (file_bh) {
 		file_bh->user_bh = user_bh;