On Thu, 8 Sep 2011, William Dunlap wrote:
Use gzcon() to make a compressed connection and any function that write
to a connection will write compressed data. E.g.,
> con <- gzcon(file("tempfile.junk", "wb"))
> x <- as.integer(rep(c(-127, 1, 127), c(3,2,1)))
> writeBin(x, con, size=1)
> close(con)
> q("no")
bill:158% zcat tempfile.junk | od --format d1
0000000 -127 -127 -127 1 1 127
0000006
(In this tiny example the gzip'ed file is bigger than the equivalent
one, but it is gzip'ed.)
That's a great function. Thanks for the tip. Apparently it works in both
directions. That is, I would also use gzcon for readBin:
Description:
‘gzcon’ provides a modified connection that wraps an existing
connection, and decompresses reads or compresses writes through
that connection. Standard ‘gzip’ headers are assumed.
Perfect. Thanks again.
Mike______________________________________________
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