1 files changed, 44 insertions, 0 deletions
diff --git a/base/util/src/netscape/security/util/ByteArrayTagOrder.java b/base/util/src/netscape/security/util/ByteArrayTagOrder.java
new file mode 100644
index 000000000..e57a3b5f1
--- /dev/null
+++ b/base/util/src/netscape/security/util/ByteArrayTagOrder.java
@@ -0,0 +1,44 @@
+// --- BEGIN COPYRIGHT BLOCK ---
+// 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; version 2 of the License.
+//
+// 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, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// (C) 2007 Red Hat, Inc.
+// All rights reserved.
+// --- END COPYRIGHT BLOCK ---
+package netscape.security.util;
+
+import java.util.Comparator;
+
+public class ByteArrayTagOrder implements Comparator<byte[]> {
+
+    /**
+     * Compare two byte arrays, by the order of their tags,
+     * as defined in ITU-T X.680, sec. 6.4. (First compare
+     * tag classes, then tag numbers, ignoring the constructivity bit.)
+     * 
+     * @param obj1 first byte array to compare.
+     * @param obj2 second byte array to compare.
+     * @return negative number if obj1 < obj2, 0 if obj1 == obj2,
+     *         positive number if obj1 > obj2.
+     * 
+     * @exception <code>ClassCastException</code> if either argument is not a byte array.
+     */
+
+    public final int compare(byte[] bytes1, byte[] bytes2) {
+
+        // tag order is same as byte order ignoring any difference in 
+        // the constructivity bit (0x02)
+        return (bytes1[0] | 0x20) - (bytes2[0] | 0x20);
+    }
+
+}