added request

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/qhybrid/requests/fossil/FilePrepareRequest.java

@@ -0,0 +1,73 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.qhybrid.requests.fossil;
+
+import android.bluetooth.BluetoothGattCharacteristic;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.UUID;
+
+import nodomain.freeyourgadget.gadgetbridge.service.devices.qhybrid.requests.Request;
+
+public class FilePrepareRequest extends Request {
+    private boolean isFinished = false;
+    private short handle;
+
+    public FilePrepareRequest(short fileHandle) {
+        this.handle = fileHandle;
+        ByteBuffer buffer = this.createBuffer();
+        buffer.putShort(fileHandle);
+
+        this.data = buffer.array();
+    }
+
+    @Override
+    public void handleResponse(BluetoothGattCharacteristic characteristic) {
+        super.handleResponse(characteristic);
+
+        if(!characteristic.getUuid().toString().equals(this.getRequestUUID().toString())){
+            throw new RuntimeException("wrong response UUID");
+        }
+
+        byte[] value = characteristic.getValue();
+
+        byte type = (byte)(value[0] & 0x0F);
+
+        if(type != 9) throw new RuntimeException("wrong response type");
+
+        if(value.length != 4) throw new RuntimeException("wrong response length");
+
+        ByteBuffer buffer = ByteBuffer.wrap(value);
+        buffer.order(ByteOrder.LITTLE_ENDIAN);
+
+        if(this.handle != buffer.getShort(1)) throw new RuntimeException("wrong response handle");
+
+        byte status = buffer.get(3);
+
+        if(status != 0) throw new RuntimeException("wrong response status");
+
+        this.isFinished = true;
+
+        this.onPrepare();
+    }
+
+    public void onPrepare(){}
+
+    @Override
+    public byte[] getStartSequence() {
+        return new byte[]{9};
+    }
+
+    @Override
+    public int getPayloadLength() {
+        return 3;
+    }
+
+    public boolean isFinished(){
+        return this.isFinished;
+    }
+
+    @Override
+    public UUID getRequestUUID() {
+        return UUID.fromString("3dda0003-957f-7d4a-34a6-74696673696d");
+    }
+}