Get the offset of the file where it start on file headers

[javi11]

It is possible to get the offset where a file starts? I want to be able to stream non compressed/ non encrypted files by read from the offset where the file start

[bodgit]

What's wrong with just using the library as-is? This seems somewhat related to #310.

No, it's not currently possible. I'm also hesitant to add such an API as it has limited use to only uncompressed and unencrypted files. It could work with compression and/or encryption but I'd end up having to expose the entire internals of the library for someone to essentially recreate the stacked io.ReadCloser implementation in the case of something like BCJ2.