1 files changed, 87 insertions, 0 deletions
diff --git a/src/javax/jmdns/impl/constants/DNSLabel.java b/src/javax/jmdns/impl/constants/DNSLabel.java
new file mode 100644
index 0000000..4e27f84
--- /dev/null
+++ b/src/javax/jmdns/impl/constants/DNSLabel.java
@@ -0,0 +1,87 @@
+/**
+ *
+ */
+package javax.jmdns.impl.constants;
+
+/**
+ * DNS label.
+ * 
+ * @author Arthur van Hoff, Jeff Sonstein, Werner Randelshofer, Pierre Frisch, Rick Blair
+ */
+public enum DNSLabel {
+    /**
+     * This is unallocated.
+     */
+    Unknown("", 0x80),
+    /**
+     * Standard label [RFC 1035]
+     */
+    Standard("standard label", 0x00),
+    /**
+     * Compressed label [RFC 1035]
+     */
+    Compressed("compressed label", 0xC0),
+    /**
+     * Extended label [RFC 2671]
+     */
+    Extended("extended label", 0x40);
+
+    /**
+     * DNS label types are encoded on the first 2 bits
+     */
+    static final int     LABEL_MASK     = 0xC0;
+    static final int     LABEL_NOT_MASK = 0x3F;
+
+    private final String _externalName;
+
+    private final int    _index;
+
+    DNSLabel(String name, int index) {
+        _externalName = name;
+        _index = index;
+    }
+
+    /**
+     * Return the string representation of this type
+     * 
+     * @return String
+     */
+    public String externalName() {
+        return _externalName;
+    }
+
+    /**
+     * Return the numeric value of this type
+     * 
+     * @return String
+     */
+    public int indexValue() {
+        return _index;
+    }
+
+    /**
+     * @param index
+     * @return label
+     */
+    public static DNSLabel labelForByte(int index) {
+        int maskedIndex = index & LABEL_MASK;
+        for (DNSLabel aLabel : DNSLabel.values()) {
+            if (aLabel._index == maskedIndex) return aLabel;
+        }
+        return Unknown;
+    }
+
+    /**
+     * @param index
+     * @return masked value
+     */
+    public static int labelValue(int index) {
+        return index & LABEL_NOT_MASK;
+    }
+
+    @Override
+    public String toString() {
+        return this.name() + " index " + this.indexValue();
+    }
+
+}