Mercurial > hg4j

annotate src/com/tmate/hgkit/ll/Nodeid.java @ 9:d6d2a630f4a6

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Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 25 Dec 2010 04:45:59 +0100
parents dbd663faec1f
children df8c67f3006a
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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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7 /**
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8 * @see mercurial/node.py
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9 * @author artem
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10 *
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11 */
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12 public class Nodeid {
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13
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14 public static int NULLREV = -1;
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15 private final byte[] binaryData;
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16
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17 public Nodeid(byte[] binaryRepresentation) {
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18 // 5 int fields => 32 bytes
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19 // byte[20] => 48 bytes
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20 this.binaryData = binaryRepresentation;
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21 }
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22
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23 @Override
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24 public String toString() {
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25 return new DigestHelper().toHexString(binaryData, 0, 20);
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26 }
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27
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28 // binascii.unhexlify()
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29 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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30 assert length % 2 == 0; // Python's binascii.hexlify convert each byte into 2 digits
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31 byte[] data = new byte[length >>> 1]; // XXX use known size instead? nodeid is always 20 bytes
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32 for (int i = 0, j = offset; i < data.length; i++) {
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33 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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34 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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35 data[i] = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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36 }
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37 return new Nodeid(data);
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38 }
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41 }