File header lookup

lookup = [(b"SQLite", "DB"),
         (b"[Content_Types].xml", "DOCX"),
         (b"bin/bash", "SH"),
         (b"announce36", "TORRENT"),
         (b"GIF89a", "GIF"),
         (b"IDA1\x00", "IDB"),
         (b"\x1f\x8b\x08","GZ"),
         (b'BM|\x11A', "BMP"),
         (b'\xff\xd8\xff\xe0', "JPG"),
         (b'!<arch>\ndebian-binary', "DEB"),
         (b"version: '3'", "YML"),
         (b'\x00\x00\x00\x1cftyp3gp4', "3GP"),
         (b'\xd4\xc3\xb2\xa1\x02', "PCAP"),
         (b'ID3\x04\x00\x00', "MP3"),
         (b"7z\xbc\xaf", "7Z"),
         (b'PK\x03\x04', "ZIP"),
         (b'[\x00.\x00S\x00h\x00e\x00l\x00l\x00C\x00l\x00a', "INI"),
         (b'\xed\xab\xee\xdb\x03\x00', "RPM"),
         (b'gimp xcf', "XCF"),
         (b'%PDF', "PDF"),
         (b'\x7fELF', "ELF"),
         (b'Date: Sun, 1 Apr', "EML"),
         (b'\x1aE\xdf\xa3\x01', "MKV"),
         (b'\x89PNG\r\n\x1a', "PNG"),
         (b'CWS\t0[\x03', "SWF"),
         (b'#include', "C"),
         (b'\xebc\x90\xd0', "SDA"), #?
         (b'KDMV', "VMDK"),
         (b'652076206c207a207b207320302075206e2064205f20302066', "TXT"),
         (b'WEBPV', "WEBP"),
         (b'\x00\x00\x01\x00', "ICO")
         ]