Add XML support for keepass keyfile and improve performance by not using chdir()

tools/recursivefiles2sha256sum.pl

@@ -16,6 +16,7 @@ use strict;
 use warnings;
 use File::Find;
 use Digest::SHA;
+use XML::Simple;
 
 my $sha = Digest::SHA->new ("sha256");
 
@@ -26,7 +27,13 @@ if (scalar @folders == 0)
   die ("use: $0 folder1 folder2...\n");
 }
 
-find (\&handlefile, @folders);
+my $conf =
+{
+  wanted   => \&handlefile,
+  no_chdir => 1,
+};
+
+find ($conf, @folders);
 
 sub handlefile
 {
@@ -35,6 +42,45 @@ sub handlefile
   return unless -f $file;
   return unless -r $file;
 
+  open (my $fh, $file) or return;
+
+  binmode $fh;
+
+  my $nread = read ($fh, my $data, 5);
+
+  close ($fh);
+
+  my $xmlhash;
+
+  if (($nread == 5) && ($data eq "<?xml"))
+  {
+    my $xml = eval { XMLin ($file) or die };
+
+    if ($@)
+    {
+      # not interesting
+    }
+    else
+    {
+      if (exists $xml->{"Key"} && exists $xml->{"Key"}->{"Data"})
+      {
+        chomp $xml->{"Key"}->{"Data"};
+
+        $xmlhash = $xml->{"Key"}->{"Data"};
+      }
+      else
+      {
+        # not interesting
+      }
+    }
+  }
+
+  if (defined $xmlhash)
+  {
+    print "$xmlhash\n";
+  }
+  else
+  {
     my $sha_copy = $sha->clone;
 
     $sha_copy->addfile  ($file);
@@ -42,4 +88,5 @@ sub handlefile
     my $digest = $sha_copy->hexdigest;
 
     print "$digest\n";
+  }
 }