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/telegram/uploader/part_test.go

@@ -0,0 +1,48 @@
+package uploader
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestUploader_checkPartSize(t *testing.T) {
+	tests := []struct {
+		name     string
+		partSize int
+		err      bool
+	}{
+		{"Zero", 0, true},
+		{"Not divisible by 1024", 1023, true},
+		{"Max not divisible by part", MaximumPartSize + 1024, true},
+		{"Default", defaultPartSize, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := checkPartSize(tt.partSize)
+			if tt.err {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}
+
+func Test_computeParts(t *testing.T) {
+	tests := []struct {
+		name     string
+		partSize int
+		total    int
+		want     int
+	}{
+		{"Exact part", 1024, 1024, 1},
+		{"Bit more than part", 1024, 1024 + 1, 2},
+		{"Stream", 1024, -1, 0},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, computeParts(tt.partSize, tt.total))
+		})
+	}
+}