Re: [Chicken-users] Fwd: Peeking N characters in string ports

[Vasilij Schneidermann]

Hello David,

I've run into a similar problem when trying to detect magic bytes for
unknown image formats.  Most allowed figuring out the format by checking
four bytes, one after three bytes.  I've solved this problem by
rethinking it a bit, first read in three bytes and compare, if it's not
the three bytes format, read in one more byte and check the remaining
signatures against the combination of the last three bytes and the
fourth one.  While this was slightly more verbose than an `unread-char`
solution, it was still simple enough to understand.

Vasilij

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