BloomFilter malloc and from_base64()

[pinkmuff]

It would be nice to be able to from_base64() to a malloc() instead of mmap().

Use case: I want to create a bloom filter of IP addresses. When a user tries to vote for something, we check their IP vs the bloom filter. If it doesn't pass, a +1 is added to the document. We store the updated bloom filter to_base64() to the same document.

On a web application, I don't want to persist these filters to disk but use a shared storage with the base64.