move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/session/tdesktop/mtp_dcoptions_test.go

@@ -0,0 +1,53 @@
+package tdesktop
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+var (
+	testIP         = "127.0.0.1"
+	optionTestData = func() []byte {
+		testData := []uint8{
+			0x00, 0x00, 0x00, 0x02, // ID
+			0x00, 0x00, 0x00, 1 << 4, // Flags
+			0x00, 0x00, 0x00, 80, // Port
+			0x00, 0x00, 0x00, uint8(len(testIP)), // IP size
+		}
+
+		// IP
+		testData = append(testData, testIP...)
+		// Secret length
+		testData = append(testData, 0x00, 0x00, 0x00, 0x00)
+
+		return testData
+	}()
+)
+
+func TestMTPDCOption_deserialize(t *testing.T) {
+	maxCut := len(optionTestData)
+
+	t.Run("OK", func(t *testing.T) {
+		a := require.New(t)
+		var m MTPDCOption
+		a.NoError(m.deserialize(&qtReader{buf: bin.Buffer{Buf: optionTestData}}, 1))
+		a.Equal(int32(2), m.ID)
+		a.True(m.Static())
+		a.Equal(bin.Fields(1<<4), m.Flags)
+		a.Equal(int32(80), m.Port)
+		a.Equal(testIP, m.IP)
+	})
+
+	for i := 0; i < maxCut; i += 4 {
+		t.Run(fmt.Sprintf("EOFAfter%d", i), func(t *testing.T) {
+			a := require.New(t)
+			var m MTPDCOption
+			r := &qtReader{buf: bin.Buffer{Buf: optionTestData[:i]}}
+			a.Error(m.deserialize(r, 1))
+		})
+	}
+}