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Matts (1087)

Matts
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I work for MessageLabs [messagelabs.com] in Toronto, ON, Canada. I write spam filters, MTA software, high performance network software, string matching algorithms, and other cool stuff mostly in Perl and C.

Journal of Matts (1087)

Wednesday November 06, 2002
10:14 AM

Uue, MIME, etc

[ #8798 ]

Has anyone written, or does anyone know of, some perl that will heuristically detect whether a line in an email (or section of an email) is base64 encoded, or uuencoded?

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  • Far be it from me to tell you where to post, but it sounds like you are seeking Perl wisdom [perlmonks.org].

  • If you see a line long string without whitespace, it likely is one of these. Differences are:
    • The alphabet is different. UUE uses Ascii codes 33 to 96, hence, no lowercase letters; bases64 uses mainly uppercase and lowercase letters, digits, and a few more characters. See table 1 [freesoft.org]
    • UUE has a count byte up front, while base64 hasn't. So it's likely that the number of meaningful characters is 4*n+1 in UUE, and 4*n in base64. Also, you can check the value of the count byte.
    • For UUE, there should be a line "begi