1 files changed, 51 insertions, 0 deletions
diff --git a/dslog/Util.java b/dslog/Util.java
new file mode 100644
index 0000000..b430af9
--- /dev/null
+++ b/dslog/Util.java
@@ -0,0 +1,51 @@
+package dslog;
+
+import java.io.InputStream;
+
+class Util {
+	public static int[] concat(int[]... lists) {
+		int len = 0;
+		for (int[] list : lists) {
+			len += list.length;
+		}
+		int[] ret = new int[len];
+		int n = 0;
+		for (int[] list : lists) {
+			System.arraycopy(list, 0, ret, n, list.length);
+			n += list.length;
+		}
+		return ret;
+	}
+
+	public static int[] reverse(int[] list) {
+		int mid = list.length / 2;
+		int tmp;
+		for (int i = 0; i < mid; i++) {
+			tmp = list[i];
+			list[i] = list[list.length - i - 1];
+			list[list.length - i - 1] = tmp;
+		}
+		return list;
+	}
+		
+	public static double unpack(short val, int whole, int frac) {
+		switch (whole + frac) {
+		case 8:
+		case 10:
+			break;
+		default:
+			throw new IllegalArgumentException(whole+"+"+frac+" != 8|10");
+		}
+		return val / Math.pow(2, frac);
+	}
+
+	public static double unpack(int val, int whole, int frac) {
+		switch (whole + frac) {
+		case 16:
+			break;
+		default:
+			throw new IllegalArgumentException(whole+"+"+frac+" != 16");
+		}
+		return val / Math.pow(2, frac);
+	}
+}