--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/dancres/util/MSBBytePacker.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,65 @@
+package org.dancres.util;
+
+/**
+   A class to pack and unpack longs or ints into a byte array.
+   In this case, longs and ints are packed MSB first
+ */
+public class MSBBytePacker extends BytePacker {
+    private byte[] theBytes;
+
+    MSBBytePacker() {
+    }
+
+    MSBBytePacker(byte[] aBytes) {
+        theBytes = aBytes;
+    }
+
+    public void setData(byte[] aBytes) {
+        theBytes = aBytes;
+    }
+
+    public int getInt(int anOffset) {
+        int b1 = theBytes[anOffset] << 24;
+        int b2 = theBytes[anOffset + 1] << 16;
+        int b3 = theBytes[anOffset + 2] << 8;
+        int b4 = theBytes[anOffset + 3] <<0;
+
+        return ((b1 & 0xFF000000) | (b2 & 0x00FF0000) |
+                (b3 & 0X0000FF00) | (b4 & 0x000000FF));
+    }
+
+    public void putArray(byte[] anArray, int anOffset) {
+        System.arraycopy(anArray, 0, theBytes, anOffset, anArray.length);
+    }
+
+    public byte[] getArray(int anOffset, int aLength) {
+        byte[] myArray = new byte[aLength];
+
+        System.arraycopy(theBytes, anOffset, myArray, 0, aLength);
+
+        return myArray;
+    }
+
+    public long getLong(int anOffset) {
+        return (((long) getInt(anOffset)) << 32) +
+            ((getInt(anOffset + 4)) & 0xFFFFFFFFL);
+    }
+
+    public void putInt(int anInt, int anOffset) {
+        theBytes[anOffset] = (byte) ((anInt >>> 24) & 0xFF);
+        theBytes[anOffset + 1] = (byte) ((anInt >>> 16) & 0xFF);
+        theBytes[anOffset + 2] = (byte) ((anInt >>> 8) & 0xFF);
+        theBytes[anOffset + 3] = (byte) ((anInt >>> 0) & 0xFF);
+    }
+
+    public void putLong(long aLong, int anOffset) {
+        theBytes[anOffset] = (byte) ((aLong >>> 56) & 0xFF);
+        theBytes[anOffset + 1] = (byte) ((aLong >>> 48) & 0xFF);
+        theBytes[anOffset + 2] = (byte) ((aLong >>> 40) & 0xFF);
+        theBytes[anOffset + 3] = (byte) ((aLong >>> 32) & 0xFF);
+        theBytes[anOffset + 4] = (byte) ((aLong >>> 24) & 0xFF);
+        theBytes[anOffset + 5] = (byte) ((aLong >>> 16) & 0xFF);
+        theBytes[anOffset + 6] = (byte) ((aLong >>> 8) & 0xFF);
+        theBytes[anOffset + 7] = (byte) ((aLong >>> 0) & 0xFF);
+    }
+}