src/net/mattmccutchen/measurements/BitFlicking.java

   1 package net.mattmccutchen.measurements;
   2
   3 public class BitFlicking {
   4         private BitFlicking() {}
   5
   6         public static void storeLong(byte[] data, long val, int off) {
   7                 //System.err.println("Store long: " + val);
   8                 data[off  ] = (byte)(val >> 56);
   9                 data[off+1] = (byte)(val >> 48);
  10                 data[off+2] = (byte)(val >> 40);
  11                 data[off+3] = (byte)(val >> 32);
  12                 data[off+4] = (byte)(val >> 24);
  13                 data[off+5] = (byte)(val >> 16);
  14                 data[off+6] = (byte)(val >>  8);
  15                 data[off+7] = (byte)(val      );
  16         }
  17
  18         public static void storeDouble(byte[] data, double val, int off) {
  19                 storeLong(data, Double.doubleToRawLongBits(val), off);
  20         }
  21
  22         public static long loadLong(byte[] data, int off) {
  23                 long val =
  24                         (((long)data[off  ] & 0xFF) << 56)
  25                         | ((long)(data[off+1] & 0xFF) << 48)
  26                         | ((long)(data[off+2] & 0xFF) << 40)
  27                         | ((long)(data[off+3] & 0xFF) << 32)
  28                         | ((long)(data[off+4] & 0xFF) << 24)
  29                         | ((long)(data[off+5] & 0xFF) << 16)
  30                         | ((long)(data[off+6] & 0xFF) <<  8)
  31                         | (      (data[off+7] & 0xFF)      );
  32                 //System.err.println("Load long: " + val);
  33                 return val;
  34         }
  35
  36         public static double loadDouble(byte[] data, int off) {
  37                 return Double.longBitsToDouble(loadLong(data, off));
  38         }
  39 }