Add option to cache MD5 hashes

[mr_jrt]

I've been working on a large project which used the de-duplication feature to save a lot of space to cram a lot of files on a disc in various combinations, but each iteration is painful as imgburn re-hashes all of the files, not just the ones that have changed since last time. It's impressive how quickly it does such a large volume of files, but it's still wasteful and takes about 10 minutes to hash ~5GB of them.

 

So I was thinking, why not optionally cache the hashes along with the file size and timestamps and only re-hash if they don't match? It would speed things up dramatically.

 

Additionally, to save space on my HDD, I'm using NTFS hardlinks - it would be super awesome if imgburn looked at the link's siblings and avoided re-hashing files that have the same, linked content (I can recommend the "link shell extention" for working with these)

Edited November 10, 2015 by mr_jrt