I asked this question on StackExchange a few months ago http://unix.stackexchange.com/questions/183465/fastest-way-of-working-out-uncompressed-size-of-large-gzi

I asked this question on StackExchange a few months ago http://unix.stackexchange.com/questions/183465/fastest-way-of-working-out-uncompressed-size-of-large-gzipped-file http://unix.stackexchange.com/questions/183465/fastest-way-o... That's my problem with GZIP, in this particular use case anyway.