def is_pcap(pcap):
    """
    Simple test for pcap magic bytes in supplied file.

    :param pcap: File path to Pcap file to check
    :returns: True if content is pcap (magic bytes present), otherwise False.
    """
    with open(pcap, 'rb') as tmp:
        header = tmp.read(4)
        if header == b'\xa1\xb2\xc3\xd4' or header == b'\xd4\xc3\xb2\xa1':
            return True
        return False
