Initial project commit

lib/nightscout/com/eveningoutpost/dexdrip/G5Model/TransmitterMessage.java

@@ -0,0 +1,67 @@
+package com.eveningoutpost.dexdrip.G5Model;
+
+import com.eveningoutpost.dexdrip.Models.JoH;
+import com.eveningoutpost.dexdrip.Services.G5CollectionService;
+import com.google.gson.annotations.Expose;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * Created by joeginley on 3/16/16.
+ */
+
+public class TransmitterMessage {
+    protected static final String TAG = G5CollectionService.TAG; // meh
+    static final int INVALID_TIME = 0xFFFFFFFF;
+    @Expose
+    long postExecuteGuardTime = 50;
+
+    @Expose
+    public volatile byte[] byteSequence = null;
+    public ByteBuffer data = null;
+
+
+    public void setData() {
+        byte[] newData;
+    }
+
+    static int getUnsignedShort(ByteBuffer data) {
+        return ((data.get() & 0xff) + ((data.get() & 0xff) << 8));
+    }
+
+    static int getUnsignedByte(ByteBuffer data) {
+        return ((data.get() & 0xff));
+    }
+
+    static int getUnixTime() {
+        return (int) (JoH.tsl() / 1000);
+    }
+
+    void init(byte opcode, int length) {
+        data = ByteBuffer.allocate(length);
+        data.order(ByteOrder.LITTLE_ENDIAN);
+        data.put(opcode);
+    }
+
+
+    byte[] appendCRC() {
+        data.put(CRC.calculate(getByteSequence(), 0, byteSequence.length - 2));
+        return getByteSequence();
+    }
+
+    boolean checkCRC(byte[] data) {
+        if ((data == null) || (data.length < 3)) return false;
+        final byte[] crc = CRC.calculate(data, 0, data.length - 2);
+        return crc[0] == data[data.length - 2] && crc[1] == data[data.length - 1];
+    }
+
+    byte[] getByteSequence() {
+        byteSequence = data.array();
+        return byteSequence;
+    }
+
+    long guardTime() {
+        return postExecuteGuardTime;
+    }
+}