Improve performance of readLong function unrolling loop and using bit…

…wise

operators instead of additions

src/main/java/com/microsoft/sqlserver/jdbc/Util.java

@@ -197,12 +197,14 @@ static BigDecimal readBigDecimal(byte valueBytes[], int valueLength, int scale)
      * @return long value as read from bytes.
      */
     /* L0 */static long readLong(byte data[], int nOffset) {
-        long v = 0;
-        for (int i = 7; i > 0; i--) {
-            v += (long) (data[nOffset + i] & 0xff);
-            v <<= 8;
-        }
-        return v + (long) (data[nOffset] & 0xff);
+		return ((long) (data[nOffset + 7] & 0xff) << 56)
+                | ((long) (data[nOffset + 6] & 0xff) << 48)
+                | ((long) (data[nOffset + 5] & 0xff) << 40)
+                | ((long) (data[nOffset + 4] & 0xff) << 32)
+                | ((long) (data[nOffset + 3] & 0xff) << 24)
+                | ((long) (data[nOffset + 2] & 0xff) << 16)
+                | ((long) (data[nOffset + 1] & 0xff) << 8)
+                | ((long) (data[nOffset] & 0xff));
     }
 
     /**