Mercurial > hg > blitz_stable
annotate src/org/dancres/util/MSBBytePacker.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |