It's easy actually, the following code snippet will restore any file as long as you still have the hash:

  bignum i;

  for (i=0;i<MAXBIGNUM;i++) {
      if (hash(i) == filehash) {
          break;
      }
  }

  fprintf("%Bd",i);

Thanks for the JavaScript!

I really hope you're not serious, but on the off-chance that you are, bignum is not exactly a javascript data type and fprintf isn't a standard javascript function either.

It was more of a pseudo code joke.

If you weren't serious, congratulations ;)

What, you mean hashes don't won't like compression?

Sure they do ;)