Documentation for ROOT's file format

[sbinet]

hi @christianb

glad go-hep/rootio was useful

My main sources of inspiration (besides ROOT, of course) were:

• https://github.com/diana-hep/inexlib_rio
• https://github.com/diana-hep/root4j

note that the canonical go-hep/rootio repo is now at https://go-hep.org/x/hep/rootio, ie:

• https://github.com/go-hep/hep/blob/master/rootio

see here for the top-level function that decodes the streamers:

• https://github.com/go-hep/hep/blob/master/rootio/file.go#L275

and here is the full list of streamers that I can currently decode:

• https://github.com/go-hep/hep/blob/master/rootio/streamers.go

and, finally, the function that, given a StreamerElement, will generate a function that decodes a ROOT TBuffer and fill the data into a user-provided pointer-to-data:

• https://github.com/go-hep/hep/blob/master/rootio/read_streamers.go#L49

hth,
-s