stephenb wrote:
any ideas? has anybody tried to recover RData files before?
I have seen messages about that problem here before (see
RSiteSearch(".RData corrupted") for a sampling), but I don't think I've
seen any really satisfactory solutions. It would be nice to have an
error tolerant .RData dumper: it would load and display objects until
it hit an error, then report on the error, and perhaps partial
information on the object it was loading. With something like that
you'd know if you had successfully recovered the .RData file, and if
not, would have some hints about what was missing.
The source for the regular loader is in
https://svn.r-project.org/R/trunk/src/main/serialize.c, and this could
be a start for the dumper.
Duncan Murdoch
Duncan Murdoch-2 wrote:
On 7/13/2009 3:38 PM, sten...@go.com wrote:
Is there a way to identify the beginning and end of an .RData file?
I am trying to restore lost files on opensolaris where the table of
contents
is overwritten and will be reading the raw disk byte by byte.
I looked at several files in hex and the end seems different, while
most of
them, but not all begin with RDX2.X
No, there is nothing special written at the end of a file. Many .RData
files are compressed (by internal gzip), so the RDX2 header is hidden,
and you'll see bytes 1F 8B instead. (I don't think we write the trailer
bytes on the gzip stream, but I'm not sure about that.)
Duncan Murdoch
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