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/tdjson/encoder.go

@@ -0,0 +1,109 @@
+package tdjson
+
+import (
+	"encoding/base64"
+	"encoding/hex"
+	"strconv"
+
+	"github.com/go-faster/jx"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+)
+
+// Encoder is a simple wrapper around jx.Encoder to conform TL type system.
+type Encoder struct {
+	*jx.Writer
+}
+
+// PutID serializes given typeID.
+func (b Encoder) PutID(typeID string) {
+	b.Writer.FieldStart(TypeField)
+	b.Writer.Str(typeID)
+}
+
+// PutInt serializes v as signed 32-bit integer.
+func (b Encoder) PutInt(v int) {
+	b.Writer.Int(v)
+}
+
+// PutBool serializes boolean.
+func (b Encoder) PutBool(v bool) {
+	b.Writer.Bool(v)
+}
+
+// PutUint16 serializes unsigned 16-bit integer.
+func (b Encoder) PutUint16(v uint16) {
+	b.Writer.UInt32(uint32(v))
+}
+
+// PutInt32 serializes signed 32-bit integer.
+func (b Encoder) PutInt32(v int32) {
+	b.Writer.Int32(v)
+}
+
+// PutUint32 serializes unsigned 32-bit integer.
+func (b Encoder) PutUint32(v uint32) {
+	b.Writer.UInt32(v)
+}
+
+// PutInt53 serializes v as int53.
+func (b Encoder) PutInt53(v int64) {
+	b.Writer.Int64(v)
+}
+
+// PutLong serializes v as int64.
+func (b Encoder) PutLong(v int64) {
+	var buf [32]byte
+	r := append(buf[:0], '"')
+	r = strconv.AppendInt(r, v, 10)
+	r = append(r, '"')
+	b.Writer.Raw(r)
+}
+
+// PutUint64 serializes v as unsigned 64-bit integer.
+func (b Encoder) PutUint64(v uint64) {
+	// FIXME(tdakkota): TDLib API has no uint64 fields
+	// 	so this encoding may incorrect.
+	b.Writer.UInt64(v)
+}
+
+// PutDouble serializes v as 64-bit floating point.
+func (b Encoder) PutDouble(v float64) {
+	b.Writer.Float64(v)
+}
+
+// PutInt128 serializes v as 128-bit signed integer.
+func (b Encoder) PutInt128(v bin.Int128) {
+	// FIXME(tdakkota): neither TDLib API nor Telegram API has no Int128/Int256 fields
+	// 	so this encoding may incorrect.
+	b.Writer.Str(hex.EncodeToString(v[:]))
+}
+
+// PutInt256 serializes v as 256-bit signed integer.
+func (b Encoder) PutInt256(v bin.Int256) {
+	// FIXME(tdakkota): neither TDLib API not Telegram API has no Int128/Int256 fields
+	// 	so this encoding may incorrect.
+	b.Writer.Str(hex.EncodeToString(v[:]))
+}
+
+// PutString serializes bare string.
+func (b Encoder) PutString(s string) {
+	b.Writer.Str(s)
+}
+
+// PutBytes serializes bare byte string.
+func (b Encoder) PutBytes(v []byte) {
+	// See https://core.telegram.org/tdlib/docs/td__json__client_8h.html
+	//
+	// ... fields of bytes type are base64 encoded and then stored as String ...
+	b.Writer.Str(base64.RawURLEncoding.EncodeToString(v))
+}
+
+// StripComma deletes last comma, if any.
+//
+// Useful for code generation to avoid last field/element tracking.
+func (b Encoder) StripComma() {
+	if l := len(b.Buf); l > 0 && b.Buf[l-1] == ',' {
+		b.Buf = b.Buf[:l-1]
+	}
+}