Mercurial > hg > blitz_stable

annotate src/org/dancres/util/MSBBytePacker.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 package org.dancres.util;
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2
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3 /**
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4 A class to pack and unpack longs or ints into a byte array.
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5 In this case, longs and ints are packed MSB first
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6 */
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7 public class MSBBytePacker extends BytePacker {
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8 private byte[] theBytes;
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9
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10 MSBBytePacker() {
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11 }
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12
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13 MSBBytePacker(byte[] aBytes) {
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14 theBytes = aBytes;
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15 }
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16
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17 public void setData(byte[] aBytes) {
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18 theBytes = aBytes;
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19 }
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20
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21 public int getInt(int anOffset) {
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22 int b1 = theBytes[anOffset] << 24;
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23 int b2 = theBytes[anOffset + 1] << 16;
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24 int b3 = theBytes[anOffset + 2] << 8;
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25 int b4 = theBytes[anOffset + 3] <<0;
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26
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27 return ((b1 & 0xFF000000) | (b2 & 0x00FF0000) |
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28 (b3 & 0X0000FF00) | (b4 & 0x000000FF));
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29 }
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30
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31 public void putArray(byte[] anArray, int anOffset) {
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32 System.arraycopy(anArray, 0, theBytes, anOffset, anArray.length);
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33 }
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34
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35 public byte[] getArray(int anOffset, int aLength) {
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36 byte[] myArray = new byte[aLength];
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37
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38 System.arraycopy(theBytes, anOffset, myArray, 0, aLength);
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39
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40 return myArray;
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41 }
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42
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43 public long getLong(int anOffset) {
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44 return (((long) getInt(anOffset)) << 32) +
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45 ((getInt(anOffset + 4)) & 0xFFFFFFFFL);
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46 }
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47
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48 public void putInt(int anInt, int anOffset) {
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49 theBytes[anOffset] = (byte) ((anInt >>> 24) & 0xFF);
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50 theBytes[anOffset + 1] = (byte) ((anInt >>> 16) & 0xFF);
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51 theBytes[anOffset + 2] = (byte) ((anInt >>> 8) & 0xFF);
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52 theBytes[anOffset + 3] = (byte) ((anInt >>> 0) & 0xFF);
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53 }
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54
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55 public void putLong(long aLong, int anOffset) {
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56 theBytes[anOffset] = (byte) ((aLong >>> 56) & 0xFF);
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57 theBytes[anOffset + 1] = (byte) ((aLong >>> 48) & 0xFF);
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58 theBytes[anOffset + 2] = (byte) ((aLong >>> 40) & 0xFF);
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59 theBytes[anOffset + 3] = (byte) ((aLong >>> 32) & 0xFF);
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60 theBytes[anOffset + 4] = (byte) ((aLong >>> 24) & 0xFF);
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61 theBytes[anOffset + 5] = (byte) ((aLong >>> 16) & 0xFF);
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62 theBytes[anOffset + 6] = (byte) ((aLong >>> 8) & 0xFF);
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63 theBytes[anOffset + 7] = (byte) ((aLong >>> 0) & 0xFF);
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64 }
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65 }