decode an integer from the format string , return zero if not starting on a digit . \ param advance whether to move the stream position . concode_field_sep int formatOff concode_elem_sep boolean isRaw concode_elem_sep int formatRepeatCount concode_elem_sep String format concode_field_sep void checkType concode_elem_sep char getType concode_elem_sep int getLengthFromFormat concode_elem_sep int available concode_elem_sep void reset concode_elem_sep String toString concode_elem_sep void consume concode_elem_sep boolean hasLength