--- /dev/null
+package org.openflow.util;
+
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+
+/*****
+ * A util library class for dealing with the lack of unsigned datatypes in Java
+ *
+ * @author Rob Sherwood (rob.sherwood@stanford.edu)
+ * @author David Erickson (daviderickson@cs.stanford.edu)
+ */
+
+public class Unsigned {
+ /**
+ * Get an unsigned byte from the current position of the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the byte from
+ * @return an unsigned byte contained in a short
+ */
+ public static short getUnsignedByte(ByteBuffer bb) {
+ return ((short) (bb.get() & (short) 0xff));
+ }
+
+ /**
+ * Get an unsigned byte from the specified offset in the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the byte from
+ * @param offset the offset to get the byte from
+ * @return an unsigned byte contained in a short
+ */
+ public static short getUnsignedByte(ByteBuffer bb, int offset) {
+ return ((short) (bb.get(offset) & (short) 0xff));
+ }
+
+ /**
+ * Put an unsigned byte into the specified ByteBuffer at the current
+ * position
+ *
+ * @param bb ByteBuffer to put the byte into
+ * @param v the short containing the unsigned byte
+ */
+ public static void putUnsignedByte(ByteBuffer bb, short v) {
+ bb.put((byte) (v & 0xff));
+ }
+
+ /**
+ * Put an unsigned byte into the specified ByteBuffer at the specified
+ * offset
+ *
+ * @param bb ByteBuffer to put the byte into
+ * @param v the short containing the unsigned byte
+ * @param offset the offset to insert the unsigned byte at
+ */
+ public static void putUnsignedByte(ByteBuffer bb, short v, int offset) {
+ bb.put(offset, (byte) (v & 0xff));
+ }
+
+ /**
+ * Get an unsigned short from the current position of the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the byte from
+ * @return an unsigned short contained in a int
+ */
+ public static int getUnsignedShort(ByteBuffer bb) {
+ return (bb.getShort() & 0xffff);
+ }
+
+ /**
+ * Get an unsigned short from the specified offset in the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the short from
+ * @param offset the offset to get the short from
+ * @return an unsigned short contained in a int
+ */
+ public static int getUnsignedShort(ByteBuffer bb, int offset) {
+ return (bb.getShort(offset) & 0xffff);
+ }
+
+ /**
+ * Put an unsigned short into the specified ByteBuffer at the current
+ * position
+ *
+ * @param bb ByteBuffer to put the short into
+ * @param v the int containing the unsigned short
+ */
+ public static void putUnsignedShort(ByteBuffer bb, int v) {
+ bb.putShort((short) (v & 0xffff));
+ }
+
+ /**
+ * Put an unsigned short into the specified ByteBuffer at the specified
+ * offset
+ *
+ * @param bb ByteBuffer to put the short into
+ * @param v the int containing the unsigned short
+ * @param offset the offset to insert the unsigned short at
+ */
+ public static void putUnsignedShort(ByteBuffer bb, int v, int offset) {
+ bb.putShort(offset, (short) (v & 0xffff));
+ }
+
+ /**
+ * Get an unsigned int from the current position of the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the int from
+ * @return an unsigned int contained in a long
+ */
+ public static long getUnsignedInt(ByteBuffer bb) {
+ return ((long) bb.getInt() & 0xffffffffL);
+ }
+
+ /**
+ * Get an unsigned int from the specified offset in the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the int from
+ * @param offset the offset to get the int from
+ * @return an unsigned int contained in a long
+ */
+ public static long getUnsignedInt(ByteBuffer bb, int offset) {
+ return ((long) bb.getInt(offset) & 0xffffffffL);
+ }
+
+ /**
+ * Put an unsigned int into the specified ByteBuffer at the current position
+ *
+ * @param bb ByteBuffer to put the int into
+ * @param v the long containing the unsigned int
+ */
+ public static void putUnsignedInt(ByteBuffer bb, long v) {
+ bb.putInt((int) (v & 0xffffffffL));
+ }
+
+ /**
+ * Put an unsigned int into the specified ByteBuffer at the specified offset
+ *
+ * @param bb ByteBuffer to put the int into
+ * @param v the long containing the unsigned int
+ * @param offset the offset to insert the unsigned int at
+ */
+ public static void putUnsignedInt(ByteBuffer bb, long v, int offset) {
+ bb.putInt(offset, (int) (v & 0xffffffffL));
+ }
+
+ /**
+ * Get an unsigned long from the current position of the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the long from
+ * @return an unsigned long contained in a BigInteger
+ */
+ public static BigInteger getUnsignedLong(ByteBuffer bb) {
+ byte[] v = new byte[8];
+ for (int i = 0; i < 8; ++i) {
+ v[i] = bb.get(i);
+ }
+ return new BigInteger(1, v);
+ }
+
+ /**
+ * Get an unsigned long from the specified offset in the ByteBuffer
+ *
+ * @param bb ByteBuffer to get the long from
+ * @param offset the offset to get the long from
+ * @return an unsigned long contained in a BigInteger
+ */
+ public static BigInteger getUnsignedLong(ByteBuffer bb, int offset) {
+ byte[] v = new byte[8];
+ for (int i = 0; i < 8; ++i) {
+ v[i] = bb.get(offset+i);
+ }
+ return new BigInteger(1, v);
+ }
+
+ /**
+ * Put an unsigned long into the specified ByteBuffer at the current
+ * position
+ *
+ * @param bb ByteBuffer to put the long into
+ * @param v the BigInteger containing the unsigned long
+ */
+ public static void putUnsignedLong(ByteBuffer bb, BigInteger v) {
+ bb.putLong(v.longValue());
+ }
+
+ /**
+ * Put an unsigned long into the specified ByteBuffer at the specified
+ * offset
+ *
+ * @param bb ByteBuffer to put the long into
+ * @param v the BigInteger containing the unsigned long
+ * @param offset the offset to insert the unsigned long at
+ */
+ public static void putUnsignedLong(ByteBuffer bb, BigInteger v, int offset) {
+ bb.putLong(offset, v.longValue());
+ }
+}
Code Review / controller.git / blobdiff