Implement keyboard/mouse control

To control the device from the computer:
 - retrieve mouse and keyboard SDL events;
 - convert them to Android events;
 - serialize them;
 - send them on the same socket used by the video stream (but in the
 opposite direction);
 - deserialize the events on the Android side;
 - inject them using the InputManager.

server/Makefile

@@ -1,9 +1,12 @@
-.PHONY: jar push run clean
+.PHONY: jar push run clean compile compiletests test
 
 SRC_DIR := src
 GEN_DIR := gen
 CLS_DIR := classes
 CLS_DEX := classes.dex
+TEST_SRC_DIR := tests
+TEST_CLS_DIR := test_classes
+TEST_LIBS := /usr/share/java/junit4.jar:/usr/share/java/hamcrest-core.jar
 
 BUILD_TOOLS := $(ANDROID_HOME)/build-tools/26.0.2
 AIDL := $(BUILD_TOOLS)/aidl
@@ -17,15 +20,24 @@ ANDROID_JAR := $(ANDROID_HOME)/platforms/android-26/android.jar
 
 AIDL_SRC := android/view/IRotationWatcher.aidl
 SRC := com/genymobile/scrcpy/ScrCpyServer.java \
+	com/genymobile/scrcpy/ControlEvent.java \
+	com/genymobile/scrcpy/ControlEventReader.java \
 	com/genymobile/scrcpy/DesktopConnection.java \
 	com/genymobile/scrcpy/DeviceUtil.java \
+	com/genymobile/scrcpy/EventController.java \
 	com/genymobile/scrcpy/ScreenInfo.java \
 	com/genymobile/scrcpy/ScreenStreamer.java \
 	com/genymobile/scrcpy/ScreenStreamerSession.java \
 	com/genymobile/scrcpy/wrappers/DisplayManager.java \
+	com/genymobile/scrcpy/wrappers/InputManager.java \
 	com/genymobile/scrcpy/wrappers/ServiceManager.java \
 	com/genymobile/scrcpy/wrappers/WindowManager.java \
 
+TEST_SRC := com/genymobile/scrcpy/ControlEventReaderTest.java \
+
+# generate classnames from filepath
+TEST_CLS := $(subst /,.,$(basename $(TEST_SRC)))
+
 JAR := scrcpy-server.jar
 MAIN := com.genymobile.scrcpy.ScrCpyServer
 
@@ -35,6 +47,7 @@ SRC_CLS := $(SRC:%.java=$(CLS_DIR)/%.class)
 CLS := $(AIDL_CLS) $(SRC_CLS)
 
 ALL_JAVA := $(AIDL_GEN) $(addprefix $(SRC_DIR)/,$(SRC))
+ALL_TESTS := $(addprefix $(TEST_SRC_DIR)/,$(TEST_SRC))
 
 jar: $(JAR)
 
@@ -42,13 +55,16 @@ $(AIDL_GEN): $(GEN_DIR)/%.java : $(SRC_DIR)/%.aidl
 	mkdir -p $(GEN_DIR)
 	"$(AIDL)" -o$(GEN_DIR) $(SRC_DIR)/$(AIDL_SRC)
 
-
-$(JAR): $(ALL_JAVA)
-	@mkdir -p $(CLS_DIR)
+compile: $(ALL_JAVA)
+	@mkdir -p "$(CLS_DIR)"
 	javac -source 1.7 -target 1.7 \
 		-cp "$(ANDROID_JAR)" \
 		-d "$(CLS_DIR)" -sourcepath $(SRC_DIR):$(GEN_DIR) \
 		$(ALL_JAVA)
+
+$(JAR): $(ALL_JAVA)
+	# we cannot track easily class dependencies, so execute compile only when jar is outdated
+	+$(MAKE) compile
 	"$(DX)" --dex --output=$(CLS_DEX) $(CLS_DIR)
 	jar cvf $(JAR) classes.dex
 
@@ -59,4 +75,12 @@ run: push
 	adb shell "CLASSPATH=/data/local/tmp/$(JAR) app_process /system/bin $(MAIN)"
 
 clean:
-	rm -rf $(CLS_DEX) $(CLS_DIR) $(GEN_DIR) $(JAR)
+	rm -rf $(CLS_DEX) $(CLS_DIR) $(GEN_DIR) $(JAR) $(TEST_CLS_DIR)
+
+compiletests: compile $(ALL_TESTS)
+	@mkdir -p "$(TEST_CLS_DIR)"
+	javac -cp "$(TEST_LIBS):$(ANDROID_JAR):$(CLS_DIR)" -d "$(TEST_CLS_DIR)" -sourcepath "$(TEST_SRC_DIR)" $(ALL_TESTS)
+
+test:
+	+$(MAKE) compiletests
+	java -cp "$(TEST_LIBS):$(ANDROID_JAR):$(CLS_DIR):$(TEST_CLS_DIR)" org.junit.runner.JUnitCore $(TEST_CLS)