The order of decompressing and decoding matters. You want to first uncompress and then decode. If you want to cheat, you can use PerlIO::gzip:
my $in;
my $open_mode = '<:raw';
if ($filename=~/\.gz$/) {
$open_mode .= ':gzip';
}
$open_mode .= ':utf8';
open my $in, $open_mode, $filename or die "Can't read $filename: $
+!\n";
If you want to stay with IO::Uncompress::Gunzip, I think the following should work, but I don't know if ->binmode() also applies other encodings properly:
my $in;
if ($filename=~/\.gz$/) {
$in = new IO::Uncompress::Gunzip $in, { AutoClose => 1 };
} else {
open $in, '<:raw', $filename or die "Can't read $filename: $!\
+n";
};
binmode $in, ':utf8';
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