Mercurial > jhg

annotate src/com/tmate/hgkit/ll/Nodeid.java @ 2:08db726a0fb7

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Shaping out low-level Hg structures
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 19 Dec 2010 05:41:31 +0100
parents dbd663faec1f
children d6d2a630f4a6
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /**
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2 * Copyright (c) 2010 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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5
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6 import java.math.BigInteger;
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7 import java.util.Formatter;
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8
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9 /**
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10 * @see mercurial/node.py
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11 * @author artem
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12 *
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13 */
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14 public class Nodeid {
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15
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16 public static int NULLREV = -1;
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17 private final byte[] binaryData;
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18
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19 public Nodeid(byte[] binaryRepresentation) {
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20 // 5 int fields => 32 bytes
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21 // byte[20] => 48 bytes
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22 this.binaryData = binaryRepresentation;
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23 }
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24
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25 @Override
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26 public String toString() {
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27 // FIXME temp impl.
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28 // BEWARE, if binaryData[0] > 0x80, BigInteger treats it as negative
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29 return new BigInteger(binaryData).toString();
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30 }
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31
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32 // binascii.unhexlify()
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33 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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34 assert length % 2 == 0; // Python's binascii.hexlify convert each byte into 2 digits
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35 byte[] data = new byte[length / 2]; // XXX use known size instead? nodeid is always 20 bytes
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36 for (int i = 0, j = offset; i < data.length; i++) {
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37 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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38 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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39 data[i] = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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40 }
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41 return new Nodeid(data);
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42 }
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43
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44
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45 }