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51package SVK::MimeDetect::FileMMagic;
52use strict;
53use warnings;
54use base qw( File::MMagic );
55
56use SVK::Util qw( is_binary_file );
57
58=for Workaround:
59
60File::MMagic 1.27 doesn't correctly handle subclassing.  The object returned by
61new is blessed into 'File::MMagic' instead of the subclass.  The author has
62accepted a patch to correct this behavior.  Once the patched version is
63released on CPAN, new() should be removed and the fixed version required.
64
65=cut
66sub new {
67    my $pkg = shift;
68    my $new_self = $pkg->SUPER::new(@_);
69    return bless $new_self, $pkg;
70}
71
72# override the default implementation because checktype_contents is faster
73sub checktype_filename {
74    my ($self, $filename) = @_;
75
76    return 'text/plain' if -z $filename;
77
78    # read a chunk and delegate to checktype_contents()
79    open my $fh, '<', $filename or die $!;
80    binmode($fh);
81    read $fh, my $data, 16 * 1024;
82    my $type = $self->checktype_contents($data);
83    return $type if $type ne 'application/octet-stream';
84
85    # verify File::MMagic's opinion on supposedly binary data
86    return $type if is_binary_file($filename);
87    return 'text/plain';
88}
89
901;
91
92__END__
93
94=head1 NAME
95
96SVK::MimeDetect::FileMMagic
97
98=head1 DESCRIPTION
99
100Implement MIME type detection using the module File::MMagic.
101