+
+ # Check to see that this entry is unique; generate a checksum
+ # and compare to any previous checksums
+ my $checksum = calc_sha1("$workdir/cddbread.$releasenum");
+ foreach my $sum (@sums) {
+ if ($checksum eq $sum) {
+ unlink("$workdir/cddbread.$releasenum");
+ $releasenum--;
+ last;
+ }
+ }
+ push (@sums, $checksum);