C versions of serialize/unserialize in packages

Are the functions 'R_Unserialize' and 'R_InitFileInPStream' allowed to
be used in R packages?  I guess I'm just not clear on the implications
of this comment in 'Rinternals.h':

/* The connection interface is not yet available to packages.  To
  allow limited use of connection pointers this defines the opaque
  pointer type. */
It applies to R_InitFile(In|Out)PStream only, and is conditionalized by
NEED_CONNECTION_PSTREAMS.  You can't create a Rconnection pointer in your 
own C code in a public way.  (The 'yet' has been there for nearly 7 
years.)

So what you are asking about is outside the conditional for that comment.
I have a function in the 'filehash' package that unserializes a bunch
of objects from a file and it seems to run much faster in C than in R.
But I don't want to release something that uses a non-public
function/interface.

Thanks,
-roger
-- 
Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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C versions of serialize/unserialize in packages

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