1 files changed, 73 insertions, 0 deletions
diff --git a/src/org/xbill/DNS/utils/base16.java b/src/org/xbill/DNS/utils/base16.java
new file mode 100644
index 0000000..58024e6
--- /dev/null
+++ b/src/org/xbill/DNS/utils/base16.java
@@ -0,0 +1,73 @@
+// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
+
+package org.xbill.DNS.utils;
+
+import java.io.*;
+
+/**
+ * Routines for converting between Strings of hex-encoded data and arrays of
+ * binary data.  This is not actually used by DNS.
+ *
+ * @author Brian Wellington
+ */
+
+public class base16 {
+
+private static final String Base16 = "0123456789ABCDEF";
+
+private
+base16() {}
+
+/**
+ * Convert binary data to a hex-encoded String
+ * @param b An array containing binary data
+ * @return A String containing the encoded data
+ */
+public static String
+toString(byte [] b) {
+	ByteArrayOutputStream os = new ByteArrayOutputStream();
+
+	for (int i = 0; i < b.length; i++) {
+		short value = (short) (b[i] & 0xFF);
+		byte high = (byte) (value >> 4);
+		byte low = (byte) (value & 0xF);
+		os.write(Base16.charAt(high));
+		os.write(Base16.charAt(low));
+	}
+	return new String(os.toByteArray());
+}
+
+/**
+ * Convert a hex-encoded String to binary data
+ * @param str A String containing the encoded data
+ * @return An array containing the binary data, or null if the string is invalid
+ */
+public static byte []
+fromString(String str) {
+	ByteArrayOutputStream bs = new ByteArrayOutputStream();
+	byte [] raw = str.getBytes();
+	for (int i = 0; i < raw.length; i++) {
+		if (!Character.isWhitespace((char)raw[i]))
+			bs.write(raw[i]);
+	}
+	byte [] in = bs.toByteArray();
+	if (in.length % 2 != 0) {
+		return null;
+	}
+
+	bs.reset();
+	DataOutputStream ds = new DataOutputStream(bs);
+
+	for (int i = 0; i < in.length; i += 2) {
+		byte high = (byte) Base16.indexOf(Character.toUpperCase((char)in[i]));
+		byte low = (byte) Base16.indexOf(Character.toUpperCase((char)in[i+1]));
+		try {
+			ds.writeByte((high << 4) + low);
+		}
+		catch (IOException e) {
+		}
+	}
+	return bs.toByteArray();
+}
+
+}