[R] readLines() changes mode of connection

[Vadim Ogranovich]

Hi,

It seems like reading a line from a gzfile() connection changes the mode of
the connection from text to binary (it also alters "can write", in case it
matters). The following transcript, produced on RedHat 7.1, demonstrates
this "feature" (note the evolution of file$text). Is this expected?

Thanks, Vadim


> file <- gzfile("foo.gz")
file <- gzfile("foo.gz")
> summary(file)
summary(file)
$description
[1] "foo.gz"

$class
[1] "gzfile"

$mode
[1] "rb6"

$text
[1] "text"

$opened
[1] "closed"

$"can read"
[1] "yes"

$"can write"
[1] "yes"

> hdr <- readLines(file, 1)
hdr <- readLines(file, 1)
> summary(file)
summary(file)
$description
[1] "foo.gz"

$class
[1] "gzfile"

$mode
[1] "rb6"

$text
[1] "binary"

$opened
[1] "closed"

$"can read"
[1] "yes"

$"can write"
[1] "no"



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