Let me know whether I understand your situation...

• For some reason, you've been scanning the web for source code regarding the computation of CRC checksums.

• As you find stuff, you aren't able to tell on your own what language a given chunk of code is written in.

• You already have one piece of perl code that works (provided for you in your other thread about checksums, but for some reason, that's not enough.

• This latest piece of code you've posted (which probably is written in C) has somehow struck you as useful, but you don't really know what it does, and so cannot describe the algorithm it uses, which is what you'd have to do in order to implement it in some other language (such as perl).

Does that sum it up? Could you explain a little more about what you are really trying to accomplish, and what you lacking in order to accomplish that? What led you to take this particular chunk of C and try to pretend that Perl would know what to do with it?

Whatever your goal may be, putting "#!/usr/bin/perl" at the top of any randomly selected chunk of source code found on the web is not an effective strategy.