Performacne improvements via adding a netty-based openflowj and openflow plugin;...

[controller.git] / third-party / openflowj_netty / src / main / java / org / openflow / util / HexString.java

diff --git a/third-party/openflowj_netty/src/main/java/org/openflow/util/HexString.java b/third-party/openflowj_netty/src/main/java/org/openflow/util/HexString.java
new file mode 100644 (file)
index 0000000..b562824
--- /dev/null
+++ b/third-party/openflowj_netty/src/main/java/org/openflow/util/HexString.java
@@ -0,0 +1,93 @@
+/**
+*    Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
+*    University
+* 
+*    Licensed under the Apache License, Version 2.0 (the "License"); you may
+*    not use this file except in compliance with the License. You may obtain
+*    a copy of the License at
+*
+*         http://www.apache.org/licenses/LICENSE-2.0
+*
+*    Unless required by applicable law or agreed to in writing, software
+*    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+*    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+*    License for the specific language governing permissions and limitations
+*    under the License.
+**/
+
+package org.openflow.util;
+
+import java.math.BigInteger;
+
+public class HexString {
+    /**
+     * Convert a string of bytes to a ':' separated hex string
+     * @param bytes
+     * @return "0f:ca:fe:de:ad:be:ef"
+     */
+    public static String toHexString(byte[] bytes) {
+        if (bytes == null) return "";
+        int i;
+        String ret = "";
+        String tmp;
+        for(i=0; i< bytes.length; i++) {
+            if(i> 0)
+                ret += ":";
+            tmp = Integer.toHexString(U8.f(bytes[i]));
+            if (tmp.length() == 1)
+                ret += "0";
+            ret += tmp; 
+        }
+        return ret;
+    }
+    
+    public static String toHexString(long val, int padTo) {
+        char arr[] = Long.toHexString(val).toCharArray();
+        String ret = "";
+        // prepend the right number of leading zeros
+        int i = 0;
+        for (; i < (padTo * 2 - arr.length); i++) {
+            ret += "0";
+            if ((i % 2) != 0)
+                ret += ":";
+        }
+        for (int j = 0; j < arr.length; j++) {
+            ret += arr[j];
+            if ((((i + j) % 2) != 0) && (j < (arr.length - 1)))
+                ret += ":";
+        }
+        return ret;        
+    }
+   
+    public static String toHexString(long val) {
+        return toHexString(val, 8);
+    }
+    
+    
+    /**
+     * Convert a string of hex values into a string of bytes
+     * @param values "0f:ca:fe:de:ad:be:ef"
+     * @return [15, 5 ,2, 5, 17] 
+     * @throws NumberFormatException If the string can not be parsed
+     */ 
+    public static byte[] fromHexString(String values) throws NumberFormatException {
+        String[] octets = values.split(":");
+        byte[] ret = new byte[octets.length];
+        
+        for(int i = 0; i < octets.length; i++) {
+            if (octets[i].length() > 2)
+                throw new NumberFormatException("Invalid octet length");
+            ret[i] = Integer.valueOf(octets[i], 16).byteValue();
+        }
+        return ret;
+    }
+    
+    public static long toLong(String values) throws NumberFormatException {
+        // Long.parseLong() can't handle HexStrings with MSB set. Sigh. 
+        BigInteger bi = new BigInteger(values.replaceAll(":", ""),16);
+        if (bi.bitLength() > 64) 
+            throw new NumberFormatException("Input string too big to fit in long: " + values);
+        return bi.longValue();
+    }
+
+}