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diff --git a/lib/Lintian/Processable/Fields/Files.pm b/lib/Lintian/Processable/Fields/Files.pm
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+# -*- perl -*-
+# Lintian::Processable::Fields::Files -- interface to .buildinfo file data collection
+#
+# Copyright (C) 2010 Adam D. Barratt
+# Copyright (C) 2018 Chris Lamb
+# Copyright (C) 2019-2020 Felix Lechner
+#
+# This program 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.
+#
+# This program 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
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package Lintian::Processable::Fields::Files;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Moo::Role;
+use namespace::clean;
+
+=head1 NAME
+
+Lintian::Processable::Fields::Files - Lintian interface to .buildinfo or changes file data collection
+
+=head1 SYNOPSIS
+
+   use Moo;
+
+   with 'Lintian::Processable::Fields::Files';
+
+=head1 DESCRIPTION
+
+Lintian::Processable::Fields::Files provides an interface to data for .buildinfo
+and changes files.  It implements data collection methods specific to .buildinfo
+and changes files.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item files
+
+Returns a reference to a hash containing information about files listed
+in the .buildinfo file.  Each hash may have the following keys:
+
+=over 4
+
+=item name
+
+Name of the file.
+
+=item size
+
+The size of the file in bytes.
+
+=item section
+
+The archive section to which the file belongs.
+
+=item priority
+
+The priority of the file.
+
+=item checksums
+
+A hash with the keys being checksum algorithms and the values themselves being
+hashes containing
+
+=over 4
+
+=item sum
+
+The result of applying the given algorithm to the file.
+
+=item filesize
+
+The size of the file as given in the .buildinfo section relating to the given
+checksum.
+
+=back
+
+=back
+
+=cut
+
+has files => (
+    is => 'rw',
+    lazy => 1,
+    default =>
+
+      sub {
+        my ($self) = @_;
+
+        my %files;
+
+        my @files_lines = split(/\n/, $self->fields->value('Files'));
+
+        # trim both ends of each line
+        s/^\s+|\s+$//g for @files_lines;
+
+        for my $line (grep { length } @files_lines) {
+
+            my @fields = split(/\s+/, $line);
+            my $basename = $fields[-1];
+
+            # ignore traversals
+            next
+              if $basename =~ m{/};
+
+            my ($md5sum, $size, $section, $priority) = @fields;
+
+            $files{$basename}{checksums}{Md5} = {
+                'sum' => $md5sum,
+                'filesize' => $size,
+            };
+
+            $files{$basename}{name} = $basename;
+            $files{$basename}{size} = $size;
+
+            unless ($self->type eq 'source') {
+
+                $files{$basename}{section} = $section;
+                $files{$basename}{priority} = $priority;
+            }
+        }
+
+        for my $algorithm (qw(Sha1 Sha256)) {
+
+            my @lines
+              = split(/\n/, $self->fields->value("Checksums-$algorithm"));
+
+            # trim both ends of each line
+            s/^\s+|\s+$//g for @lines;
+
+            for my $line (grep { length } @lines) {
+
+                my ($checksum, $size, $basename) = split(/\s+/, $line);
+
+                # ignore traversals
+                next
+                  if $basename =~ m{/};
+
+                $files{$basename}{checksums}{$algorithm} = {
+                    'sum' => $checksum,
+                    'filesize' => $size
+                };
+            }
+        }
+
+        return \%files;
+    }
+);
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Adam D. Barratt <adsb@debian.org> for Lintian.
+
+=head1 SEE ALSO
+
+lintian(1), L<Lintian::Processable>
+
+=cut
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et