*небольшой рефакторинг

*добавлен метод encode_size для Frame

metadata/utils.v

@@ -15,14 +15,13 @@ pub fn (mut audio Audio) detect_tags(mut data os.File) {
 	// ? --- Проверка версии ID3v23.3 ---
 	first_ten_bytes := get_bytes(mut data, 0, 4)
 
-	if first_ten_bytes[..3].bytestr() == "ID3" && first_ten_bytes[3] == 3 {
-		audio.id3v23.embedded = true
-	}
-	// ===============================
-
-	// ? --- Проверка версии ID3v23.4 ---
-	if first_ten_bytes[..3].bytestr() == "ID3" && first_ten_bytes[3] == 4 {
-		audio.id3v24.embedded = true
+	if first_ten_bytes[..3].bytestr() == "ID3" {
+		if first_ten_bytes[3] == 3 {
+			audio.id3v23.embedded = true
+		} else if first_ten_bytes[3] == 4 {
+			// Проверка версии ID3v23.4
+			audio.id3v24.embedded = true
+		}
 	}
 	// ===============================
 }
@@ -42,3 +41,26 @@ pub fn get_bytes(mut audio os.File, position int, size int) []u8 {
 	
 	return last_bytes
 }
+
+pub fn fill_tag[T](mut tag T, mut audio os.File) {
+	mut current_frame := &Frame{}
+	// Самая первая позиция
+	mut start_position := u64(10)
+	// Получаем вне возможные байты
+	all_tag_bytes := get_bytes(mut audio, 10, int(tag.size + start_position))
+
+	for tag.size > start_position {
+		current_frame.fill_frame(all_tag_bytes, start_position, tag.version)
+		start_position = current_frame.end
+		tag.size -= current_frame.size
+
+		tag.add_frame(current_frame)
+	}
+}
+
+pub fn get_full_size[T](mut tag T, mut audio os.File) {
+	// Первые 10 байт тэга
+	first_ten_bytes := get_bytes(mut audio, 0, 10)
+
+	tag.size = (u64(first_ten_bytes[6]) << 21) | (u64(first_ten_bytes[7]) << 14) | (u64(first_ten_bytes[8]) << 7) | u64(first_ten_bytes[9])
+}