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/fileid/file_id_fuzz_test.go

@@ -0,0 +1,47 @@
+//go:build go1.18
+// +build go1.18
+
+package fileid
+
+import (
+	"testing"
+
+	"github.com/k0kubun/pp/v3"
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+func FuzzDecodeEncodeDecode(f *testing.F) {
+	for name, input := range testData {
+		data, err := base64Decode(input)
+		if err != nil {
+			f.Fatal(name, err)
+		}
+		data = rleDecode(data)
+		f.Add(data)
+	}
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		a := require.New(t)
+		input := bin.Buffer{Buf: data}
+
+		var fileID FileID
+		if err := fileID.decodeLatestFileID(&input); err != nil {
+			t.Skip(err)
+		}
+		if data[len(data)-1] < 32 {
+			t.Skip("Legacy file_id encoding is not supported")
+		}
+		if fileID.PhotoSizeSource.Type >= PhotoSizeSourceStickerSetThumbnail {
+			t.Log(pp.Sprint(input))
+		}
+		input.Reset()
+
+		fileID.encodeLatestFileID(&input)
+
+		var decoded FileID
+		a.NoError(decoded.decodeLatestFileID(&input))
+		a.Equal(fileID, decoded)
+	})
+}