Pure C

I haven't coded a lot in C, so you should check to see if you can find any bugs. Wanting to see how much speed we could squeeze out of our implementation/algorithm, we had to write it in C (or assembler, which Niklas didn't feel like ;) - And this is the result.
The C3 server, with optimizations, consistenly does around 1300000 lookups per second when compiled with -DUSEFASTIP2LONG, and around 900000 without (which is safer if you are not sure that you will only give valid IP addresses to the code).
My P4 2GHz, compiled with MS Visual C++ Optimizing compiler (the free kit from MS) I get app. 3,2 million lookups per second when compiled with -DUSEFASTIP2LONG, and around 2,7 million without! Kind of puts the performance of the other languages in perspective ;)
If you give ip2c_bench.exe an argument, it will print out the IP addresses, and their corresponding country, if you'd like to check the validity.

Downloads

ip2c-0.9.2.tar.bz2 - C source code bzip2'ed (393 KB)
ip2c-0.9.2.zip - C source code zipped (332 KB)

Windows .exe of C implementation

If you don't feel like compiling your own on windows, and want to test out the app, we pre-built the command line tool (ip2c.exe) and the benchmarker (ip2c_bench.exe) for you to download here. They require a Pentium Pro or better.

Download ip2c-winexe-0.9.2.zip (376 KB)

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