cos_comm.py 文件源码

def deal_with_empty_file_stream(data):
    """???????????0???????????"""
    if hasattr(data, 'fileno') and hasattr(data, 'tell'):
        try:
            fileno = data.fileno()
            total_length = os.fstat(fileno).st_size
            current_position = data.tell()
            if total_length - current_position == 0:
                return ""
        except io.UnsupportedOperation:
            return ""
    return data