File Coverage

blib/lib/XML/SAX/PurePerl/EncodingDetect.pm

Criterion	Covered	Total	%
statement	15	49	30.6
branch	20	38	52.6
condition			n/a
subroutine	2	2	100.0
pod	0	1	0.0
total	37	90	41.1

# $Id$

package XML::SAX::PurePerl; # NB, not ::EncodingDetect!

use strict;

sub encoding_detect {
    my ($parser, $reader) = @_;

    my $error = "Invalid byte sequence at start of file";

    my $data = $reader->data;
    if ($data =~ /^\x00\x00\xFE\xFF/) {
        # BO-UCS4-be
        $reader->move_along(4);
        $reader->set_encoding('UCS-4BE');
        return;
    }
    elsif ($data =~ /^\x00\x00\xFF\xFE/) {
        # BO-UCS-4-2143
        $reader->move_along(4);
        $reader->set_encoding('UCS-4-2143');
        return;
    }
    elsif ($data =~ /^\x00\x00\x00\x3C/) {
        $reader->set_encoding('UCS-4BE');
        return;
    }
    elsif ($data =~ /^\x00\x00\x3C\x00/) {
        $reader->set_encoding('UCS-4-2143');
        return;
    }
    elsif ($data =~ /^\x00\x3C\x00\x00/) {
        $reader->set_encoding('UCS-4-3412');
        return;
    }
    elsif ($data =~ /^\x00\x3C\x00\x3F/) {
        $reader->set_encoding('UTF-16BE');
        return;
    }
    elsif ($data =~ /^\xFF\xFE\x00\x00/) {
        # BO-UCS-4LE
        $reader->move_along(4);
        $reader->set_encoding('UCS-4LE');
        return;
    }
    elsif ($data =~ /^\xFF\xFE/) {
        $reader->move_along(2);
        $reader->set_encoding('UTF-16LE');
        return;
    }
    elsif ($data =~ /^\xFE\xFF\x00\x00/) {
        $reader->move_along(4);
        $reader->set_encoding('UCS-4-3412');
        return;
    }
    elsif ($data =~ /^\xFE\xFF/) {
        $reader->move_along(2);
        $reader->set_encoding('UTF-16BE');
        return;
    }
    elsif ($data =~ /^\xEF\xBB\xBF/) { # UTF-8 BOM
        $reader->move_along(3);
        $reader->set_encoding('UTF-8');
        return;
    }
    elsif ($data =~ /^\x3C\x00\x00\x00/) {
        $reader->set_encoding('UCS-4LE');
        return;
    }
    elsif ($data =~ /^\x3C\x00\x3F\x00/) {
        $reader->set_encoding('UTF-16LE');
        return;
    }
    elsif ($data =~ /^\x3C\x3F\x78\x6D/) {
        # $reader->set_encoding('UTF-8');
        return;
    }
    elsif ($data =~ /^\x3C\x3F\x78/) {
        # $reader->set_encoding('UTF-8');
        return;
    }
    elsif ($data =~ /^\x3C\x3F/) {
        # $reader->set_encoding('UTF-8');
        return;
    }
    elsif ($data =~ /^\x3C/) {
        # $reader->set_encoding('UTF-8');
        return;
    }
    elsif ($data =~ /^[\x20\x09\x0A\x0D]+\x3C[^\x3F]/) {
        # $reader->set_encoding('UTF-8');
        return;
    }
    elsif ($data =~ /^\x4C\x6F\xA7\x94/) {
        $reader->set_encoding('EBCDIC');
        return;
    }

    warn("Unable to recognise encoding of this document");
    return;
}

1;