Writing a UTF-8 file
- From: "pearly" <michael_perle@xxxxxxxxx>
- Date: 5 Jan 2007 07:37:31 -0800
Hello everybody,
Does anyone know how I can write UTF-8 files without
a BOM in Perl?
Whether I open files in utf8 mode (2nd parameter of open or
via binmode) I always end up with
- A BOM "FF FE" (UTF-16LE afaik) at the start of the output file;
- Encoding with minimum 2 bytes per character.
I am reading strings from an external resource, so the following
is not 100% representative but has the same effect:
my $string_with_special_chars = "Château Müller\nGarçon";
# String contains entities acirc, uuml and ccedil.
open F, ">:utf8", "test.txt";
print F $string_with_special_chars;
Tried it both on Linux (Perl 5.8.6) and Windows (Perl 5.8.7).
Difference between utf8 and default mode:
The file created without explicit utf8 mode is readable in
Firefox (UTF-8 encoding). My hex editor shows that for all
characters the 2nd byte is 0x00.
The file opened with ">:utf8" shows hex C3 00 A2 00 for the
u umlaut resp. in total 6 bytes more due to the 3 special chars.
Where does the BOM 0xFF 0xFE come from?
Why does Perl add it?
Doesn't Perl write UTF-8 by default?
Why adding the BOM and why 2 or more bytes per character?
Puzzeling since ages (ok, days) on this.
Thank you for any hints.
MP
.
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