Bit substring search

[Kris Kennaway]

I am trying to parse a bit-stream file format (bzip2) that does not have 
byte-aligned record boundaries, so I need to do efficient matching of 
bit substrings at arbitrary bit offsets.

Is there a package that can do this?  This one comes close:
http://ilan.schnell-web.net/prog/bitarray/

but it only supports single bit substring match.

Kris
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