Hi,
On Thu, Jul 11, 2002 at 12:15:30PM +0100, Nick Ing-Simmons wrote:
For my Tk application of encode the in-place form causes unnecessary
copies. e.g. I need the original and the form encoded into the encoding
required by the font, or I have to copy the input arg to return location.
But whether the caller or the callee makes the copy should make no
difference in performance. I personally prefer to make copies as
late as possible.
Doing in-place is very hard to do when converting between two variable
length encodings. I suspect your "all perl" version is not _really_
doing it "in place" but just in same scalar, but in different PV "buffers".
Correct. But (see your own example below) I could also write
something like
my $replace = $subchar x 128;
$_[n] =~ y/\x80-\xff/$replace/;
for many 8bit to ascii encodings and leave the decision whether a
copy of the original is left to the caller.
The Encode API is writen to allow core of encodings to be written in C
Keeping return value and source separate is very useful for C.
However, do you need witch-craft to copy a string buffer in C if the
need for it arises?
I would use Encode that way as well.
my $enc = find_encoding('cp1250');
my $string = decode($enc,$octets);
That's it. ;-)
Provided that it is safe to call decode() and encode() as many times
as I want, even after an error, that's exactly what I was looking
for.
Thanks!
Guido
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