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&=LV[( ' package Encode::Guess;
use strict;
use warnings;
use Encode qw(:fallbacks find_encoding);
our $VERSION = do { my @r = ( q$Revision: 2.8 $ =~ /\d+/g ); sprintf "%d." . "%02d" x $#r, @r };
my $Canon = 'Guess';
use constant DEBUG => !!$ENV{PERL_ENCODE_DEBUG};
our %DEF_SUSPECTS = map { $_ => find_encoding($_) } qw(ascii utf8);
my $obj = bless {
Name => $Canon,
Suspects => {%DEF_SUSPECTS},
} => __PACKAGE__;
Encode::define_encoding($obj, $Canon);
use parent qw(Encode::Encoding);
sub needs_lines { 1 }
sub perlio_ok { 0 }
our @EXPORT = qw(guess_encoding);
our $NoUTFAutoGuess = 0;
our $UTF8_BOM = pack( "C3", 0xef, 0xbb, 0xbf );
sub import { # Exporter not used so we do it on our own
my $callpkg = caller;
for my $item (@EXPORT) {
no strict 'refs';
*{"$callpkg\::$item"} = \&{"$item"};
}
set_suspects(@_);
}
sub set_suspects {
my $class = shift;
my $self = ref($class) ? $class : $Encode::Encoding{$Canon};
$self->{Suspects} = {%DEF_SUSPECTS};
$self->add_suspects(@_);
}
sub add_suspects {
my $class = shift;
my $self = ref($class) ? $class : $Encode::Encoding{$Canon};
for my $c (@_) {
my $e = find_encoding($c) or die "Unknown encoding: $c";
$self->{Suspects}{ $e->name } = $e;
DEBUG and warn "Added: ", $e->name;
}
}
sub decode($$;$) {
my ( $obj, $octet, $chk ) = @_;
my $guessed = guess( $obj, $octet );
unless ( ref($guessed) ) {
require Carp;
Carp::croak($guessed);
}
my $utf8 = $guessed->decode( $octet, $chk || 0 );
$_[1] = $octet if $chk;
return $utf8;
}
sub guess_encoding {
guess( $Encode::Encoding{$Canon}, @_ );
}
sub guess {
my $class = shift;
my $obj = ref($class) ? $class : $Encode::Encoding{$Canon};
my $octet = shift;
# sanity check
return "Empty string, empty guess" unless defined $octet and length $octet;
# cheat 0: utf8 flag;
if ( Encode::is_utf8($octet) ) {
return find_encoding('utf8') unless $NoUTFAutoGuess;
Encode::_utf8_off($octet);
}
# cheat 1: BOM
use Encode::Unicode;
unless ($NoUTFAutoGuess) {
my $BOM = pack( 'C3', unpack( "C3", $octet ) );
return find_encoding('utf8')
if ( defined $BOM and $BOM eq $UTF8_BOM );
$BOM = unpack( 'N', $octet );
return find_encoding('UTF-32')
if ( defined $BOM and ( $BOM == 0xFeFF or $BOM == 0xFFFe0000 ) );
$BOM = unpack( 'n', $octet );
return find_encoding('UTF-16')
if ( defined $BOM and ( $BOM == 0xFeFF or $BOM == 0xFFFe ) );
if ( $octet =~ /\x00/o )
{ # if \x00 found, we assume UTF-(16|32)(BE|LE)
my $utf;
my ( $be, $le ) = ( 0, 0 );
if ( $octet =~ /\x00\x00/o ) { # UTF-32(BE|LE) assumed
$utf = "UTF-32";
for my $char ( unpack(