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src/main/java/tools/LongTool.java

@@ -0,0 +1,41 @@
+package tools;
+
+/**
+ *
+ * @author Shavit
+ */
+public class LongTool {
+    
+    // Converts 8 bytes to a long.
+    public static long BytesToLong(byte[] aToConvert)
+    {
+        if(aToConvert.length != Long.BYTES)
+        {
+            throw new IllegalArgumentException(String.format("Size of input should be %d", (Long.SIZE / 8)));
+        }
+
+        long nResult = 0;
+
+        for(int i = 0; i < Long.BYTES; i++)
+        {
+            nResult <<= Byte.SIZE;
+            nResult |= (aToConvert[i] & 0xFF);
+        }
+
+        return nResult;
+    }
+
+    // Converts a long to 8 bytes.
+    public static byte[] LongToBytes(long nToConvert)
+    {
+        byte[] aBytes = new byte[Long.BYTES];
+
+        for(int i = aBytes.length - 1; i >= 0; i--)
+        {
+            aBytes[i] = (byte) (nToConvert & 0xFF);
+            nToConvert >>= Byte.SIZE;
+        }
+
+        return aBytes;
+    }
+}