feat(input): add absolute pointer and scroll

gateway/apollo_enet_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/binary"
 	"encoding/hex"
+	"errors"
 	"net"
 	"testing"
 	"time"
@@ -328,13 +329,52 @@ func TestApolloControlWireVectorAndTagFailure(t *testing.T) {
 }
 
 func TestApolloKeyboardInputWireVector(t *testing.T) {
-	packet, err := encodeApolloInputEvent(InputEvent{Device: "keyboard", Code: 30, Pressed: true, Payload: []byte{2}})
+	packets, err := encodeApolloInputEvent(InputEvent{Device: "keyboard", Code: 30, Pressed: true, Payload: []byte{2}})
 	if err != nil {
 		t.Fatal(err)
 	}
 	const expected = "0000000a03000000001e00020000"
-	if string(packet.payload) != string(mustDecodeHex(t, expected)) {
-		t.Fatalf("keyboard packet = %x, want %s", packet.payload, expected)
+	if len(packets) != 1 || string(packets[0].payload) != string(mustDecodeHex(t, expected)) {
+		t.Fatalf("keyboard packets = %#v, want %s", packets, expected)
+	}
+}
+
+func TestApolloAbsoluteAndScrollInputWireVectors(t *testing.T) {
+	// Independently implemented from the approved Apollo adc5c5a0 input.cpp
+	// consumer and its moonlight-common-c c999436 Input.h/InputStream.c pin.
+	absolute, err := encodeApolloInputEvent(InputEvent{Device: "mouse-absolute", Payload: []byte{0x04, 0xd2, 0x02, 0x37, 0x0a, 0x00, 0x05, 0xa0}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	const absoluteExpected = "0000000e0500000004d20237000009ff059f"
+	if len(absolute) != 1 || absolute[0].channel != apolloChannelMouse || string(absolute[0].payload) != string(mustDecodeHex(t, absoluteExpected)) {
+		t.Fatalf("absolute packets = %#v, want %s", absolute, absoluteExpected)
+	}
+
+	scroll, err := encodeApolloInputEvent(InputEvent{Device: "mouse-scroll", Payload: []byte{0xff, 0x88, 0x00, 0x78}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	const verticalExpected = "0000000a0a000000ff88ff880000"
+	const horizontalExpected = "00000006010000550078"
+	if len(scroll) != 2 || scroll[0].channel != apolloChannelMouse || scroll[1].channel != apolloChannelMouse ||
+		string(scroll[0].payload) != string(mustDecodeHex(t, verticalExpected)) || string(scroll[1].payload) != string(mustDecodeHex(t, horizontalExpected)) {
+		t.Fatalf("scroll packets = %#v", scroll)
+	}
+
+	zero, err := encodeApolloInputEvent(InputEvent{Device: "mouse-scroll", Payload: make([]byte, 4)})
+	if err != nil || len(zero) != 0 {
+		t.Fatalf("zero scroll packets = %#v, %v", zero, err)
+	}
+
+	for _, payload := range [][]byte{
+		{0, 0, 0, 0, 0, 1, 0, 2},
+		{0, 0, 0, 0, 0x80, 0, 0, 2},
+		{0, 0, 0, 0, 0, 2, 0x80, 0},
+	} {
+		if _, err := encodeApolloInputEvent(InputEvent{Device: "mouse-absolute", Payload: payload}); !errors.Is(err, ErrInputMalformed) {
+			t.Fatalf("Apollo accepted unrepresentable absolute payload %x: %v", payload, err)
+		}
 	}
 }