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#
# Copyright (C) 2019-2021 Alexis Bienvenüe <paamc@passoire.fr>
#
# This file is part of Auto-Multiple-Choice
#
# Auto-Multiple-Choice is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 2 of
# the License, or (at your option) any later version.
#
# Auto-Multiple-Choice is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Auto-Multiple-Choice. If not, see
# <http://www.gnu.org/licenses/>.
use warnings;
use 5.012;
package AMC::Decoder::Barcode;
use AMC::Decoder;
use AMC::Basic;
use XML::Simple;
our @ISA = ("AMC::Decoder");
use_gettext;
#####################################################################
# These methods should be overwritten for derivated classes (that
# describe decoders that AMC can handle)
#####################################################################
sub new {
my $class = shift;
my $self = $class->SUPER::new();
bless( $self, $class );
return $self;
}
sub decode_from_path {
my ( $self, $path, $unlink_when_finished ) = @_;
my $r;
my @cmd = ( "zbarimg", "--xml", "-q", $path );
debug( "Calling: " . join( ' ', @cmd ) );
my $xml = '';
if ( open( ZBAR, "-|", @cmd ) ) {
while (<ZBAR>) {
$xml .= $_;
}
close ZBAR;
my $result = XMLin( $xml, ForceArray => ['symbol'] );
my $s = $result->{source}->{index}->{symbol};
if ($s) {
my $best = $s->[0];
for my $i ( 1 .. $#{$s} ) {
$best = $s->[$i]
if ( $s->[$i]->{quality} > $best->{quality} );
}
$r = {
ok => 1,
status => "$best->{type} Q:$best->{quality}",
value => $best->{data}
};
} else {
$r = {
ok => 0,
status => "no barcode found",
value => ''
};
}
} else {
$r = {
ok => 0,
status => "failed: $!",
value => ''
};
}
unlink($path) if ($unlink_when_finished);
return ($r);
}
sub decode_image {
my ( $self, $path, $blob ) = @_;
if ( -f $path ) {
return ( $self->decode_from_path($path) );
} elsif ($blob) {
return ( $self->decode_from_path( blob_to_file($blob), 1 ) );
} else {
return (
{
ok => 0,
status => 'no image',
value => ''
}
);
}
}
1;
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