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