diff -r 0d30ea853889 -r 05c025e89571 lib/Debian/File.pm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Debian/File.pm	Fri Mar 06 00:43:13 2009 +0100
@@ -0,0 +1,65 @@
+package Debian::File;
+
+use strict;
+use warnings;
+
+use IO::File;
+use Digest::MD5;
+use Carp;
+
+sub new {
+    my $class = ref $_[0] ? ref shift : shift;
+    my $self = bless {}, $class;
+    my $description = shift;
+    my %args = @_;
+
+    @{$self}{keys %args} = values %args;
+
+    foreach my $a (qw/prefix current_prefix/) {
+	$self->{$a} =~ s/\/$//;
+    }
+
+    my @fields = split " ", $description;
+
+    if (@fields == 5) {
+	@{$self}{qw/md5 size section part file/} = @fields;
+    } elsif (@fields == 3) {
+	@{$self}{qw/md5 size file/} = @fields;
+    } else {
+	croak "Unknown format: $_\n";
+    }
+
+    $self->check;   # will croak
+    return $self;
+}
+
+sub md5 { $_[0]->{md5} }
+sub size { $_[0]->{size} }
+sub section { $_[0]->{section} }
+sub part { $_[0]->{part} }
+sub file { $_[0]->{file} }
+sub prefix { $_[0]->{prefix} }
+sub path { join "/", @{$_[0]}{qw/prefix file/} }
+sub component { $_[0] =~ /^(.*?)\// ? $1 : "main" }
+
+sub check {
+    my $self = shift;
+
+
+    my $file = join "/", $self->{current_prefix} ? $self->{current_prefix} : $self->{prefix}, $self->file;
+    my $size = $self->size;
+    my $md5 = $self->md5;
+
+    croak "File does not exist: $file\n"  if !-f $file;
+    croak "Size mismatch: $file (" . (-s _) . " != $size)\n" if not $size == (-s _);
+
+    my $digest = new Digest::MD5;
+    my $fh = new IO::File $file or croak "Can't open <$file: $!\n";
+    $digest->addfile($fh);
+
+    croak "MD5 mismatch: $file\n" if not $digest->hexdigest eq $md5;
+}
+
+1;
+
+# vim:sts=4 sw=4 aw ai sm: