1 files changed, 98 insertions, 0 deletions
diff --git a/base/util/src/netscape/security/util/UniversalCharsetDecoder.java b/base/util/src/netscape/security/util/UniversalCharsetDecoder.java
new file mode 100644
index 000000000..a41c5ad50
--- /dev/null
+++ b/base/util/src/netscape/security/util/UniversalCharsetDecoder.java
@@ -0,0 +1,98 @@
+// --- 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.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.CoderResult;
+import java.nio.charset.CodingErrorAction;
+
+/**
+ * Converts bytes in ASN.1 UniversalString character set to UniversalString
+ * characters.
+ * 
+ * @author Lily Hsiao
+ * @author Slava Galperin
+ */
+
+public class UniversalCharsetDecoder extends CharsetDecoder {
+
+    public UniversalCharsetDecoder(Charset cs) {
+        super(cs, 0.25f, 1);
+    }
+
+    protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) {
+
+        while (true) {
+            // XXX we do not know what to do with truly UCS-4 characters here
+            // we also assumed network byte order
+
+            if (in.remaining() < 4)
+                return CoderResult.UNDERFLOW;
+
+            in.mark();
+            byte b0 = in.get();
+            byte b1 = in.get();
+            byte b2 = in.get();
+            byte b3 = in.get();
+
+            if (CodingErrorAction.REPORT == unmappableCharacterAction() &&
+                    !((b0 == 0 && b1 == 0) || (b2 == 0 && b3 == 0))) {
+                return CoderResult.unmappableForLength(4);
+            }
+
+            char c;
+            if (b2 == 0 && b3 == 0) {
+                // Try to be a bit forgiving. If the byte order is
+                // reversed, we still try handle it.
+
+                // Sample Date Set (1):
+                // 0000000   f   0  \0  \0 213   0  \0  \0   S   0  \0  \0
+                // 0000014
+
+                // Sample Date Set (2):
+                // 0000000   w  \0  \0  \0   w  \0  \0  \0   w  \0  \0  \0   .  \0  \0  \0
+                // 0000020   (  \0  \0  \0   t  \0  \0  \0   o  \0  \0  \0   b  \0  \0  \0
+                // 0000040   e  \0  \0  \0   |  \0  \0  \0   n  \0  \0  \0   o  \0  \0  \0
+                // 0000060   t  \0  \0  \0   t  \0  \0  \0   o  \0  \0  \0   b  \0  \0  \0
+                // 0000100   e  \0  \0  \0   )  \0  \0  \0   .  \0  \0  \0   c  \0  \0  \0
+                // 0000120   o  \0  \0  \0   m  \0  \0  \0
+                // 0000130
+                c = (char) (((b1 << 8) & 0xff00) + (b0 & 0x00ff));
+
+            } else { // (b0 == 0 && b1 == 0)
+                // This should be the right order.
+                //
+                // 0000000 0000 00c4 0000 0064 0000 006d 0000 0069
+                // 0000020 0000 006e 0000 0020 0000 0051 0000 0041
+                // 0000040
+
+                c = (char) (((b2 << 8) & 0xff00) + (b3 & 0x00ff));
+            }
+
+            if (out.remaining() < 1) {
+                in.reset();
+                return CoderResult.OVERFLOW;
+            }
+
+            out.put(c);
+        }
+    }
+}