trimming bytes from already captured packets

[Rick Jones <rick.jones2 () hp com>]

I have some packet captures which were taken with a snaplen of 128 
bytes, but I would like to convert that to one with a snaplen of say 66 
bytes.  The existing tcpdump/libpcap does not *seem* to do that - is 
there already a utility out there which can, or is this an "enhancement 
opportunity?"

happy benchmarking,

rick jones
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