package net.mattmccutchen.measurements;

public class BitFlicking {
	private BitFlicking() {}
	
	public static void storeLong(byte[] data, long val, int off) {
		//System.err.println("Store long: " + val);
		data[off  ] = (byte)(val >> 56);
		data[off+1] = (byte)(val >> 48);
		data[off+2] = (byte)(val >> 40);
		data[off+3] = (byte)(val >> 32);
		data[off+4] = (byte)(val >> 24);
		data[off+5] = (byte)(val >> 16);
		data[off+6] = (byte)(val >>  8);
		data[off+7] = (byte)(val      );
	}
	
	public static void storeDouble(byte[] data, double val, int off) {
		storeLong(data, Double.doubleToRawLongBits(val), off);
	}
	
	public static long loadLong(byte[] data, int off) {
		long val =
			(((long)data[off  ] & 0xFF) << 56)
			| ((long)(data[off+1] & 0xFF) << 48) 
			| ((long)(data[off+2] & 0xFF) << 40) 
			| ((long)(data[off+3] & 0xFF) << 32) 
			| ((long)(data[off+4] & 0xFF) << 24) 
			| ((long)(data[off+5] & 0xFF) << 16) 
			| ((long)(data[off+6] & 0xFF) <<  8) 
			| (      (data[off+7] & 0xFF)      );
		//System.err.println("Load long: " + val);
		return val;
	}
	
	public static double loadDouble(byte[] data, int off) {
		return Double.longBitsToDouble(loadLong(data, off));
	}
}