--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/tmate/hgkit/ll/Nodeid.java	Fri Dec 17 19:05:59 2010 +0100
@@ -0,0 +1,45 @@
+/**
+ * Copyright (c) 2010 Artem Tikhomirov 
+ */
+package com.tmate.hgkit.ll;
+
+import java.math.BigInteger;
+import java.util.Formatter;
+
+/**
+ * @see mercurial/node.py
+ * @author artem
+ *
+ */
+public class Nodeid {
+	
+	public static int NULLREV = -1;
+	private final byte[] binaryData; 
+
+	public Nodeid(byte[] binaryRepresentation) {
+		// 5 int fields => 32 bytes
+		// byte[20] => 48 bytes
+		this.binaryData = binaryRepresentation;
+	}
+
+	@Override
+	public String toString() {
+		// FIXME temp impl.
+		// BEWARE, if binaryData[0] > 0x80, BigInteger treats it as negative  
+		return new BigInteger(binaryData).toString();
+	}
+
+	// binascii.unhexlify()
+	public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
+		assert length % 2 == 0; // Python's binascii.hexlify convert each byte into 2 digits
+		byte[] data = new byte[length / 2]; // XXX use known size instead? nodeid is always 20 bytes
+		for (int i = 0, j = offset; i < data.length; i++) {
+			int hiNibble = Character.digit(asciiRepresentation[j++], 16);
+			int lowNibble = Character.digit(asciiRepresentation[j++], 16);
+			data[i] = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
+		}
+		return new Nodeid(data);
+	}
+	
+	
+}