jamp3/src/lib/id3v2/frames/implementations/id3v2.frame.text-concat-list.ts

mp3, id3v1, id3v2 - reader & writer

import {IFrameImpl} from '../id3v2.frame';
import {utf8} from '../../../common/encodings';
import {IID3V2} from '../../id3v2.types';
import {getWriteTextEncoding} from '../id3v2.frame.write';

export const FrameTextConcatList: IFrameImpl = {
	/**
	 Text encoding    $xx
	 Information    <text string according to encoding>
	 */
	parse: async (reader, frame) => {
		if (frame.data.length === 0) {
			return {value: {text: ''}, encoding: utf8};
		}
		const enc = reader.readEncoding();
		let text = reader.readStringTerminated(enc);
		while (reader.hasData()) {
			const appendtext = reader.readStringTerminated(enc);
			if (appendtext.length > 0) {
				text += '/' + appendtext;
			}
		}
		const value: IID3V2.FrameValue.Text = {text};
		return {value, encoding: enc};
	},
	write: async (frame, stream, head, defaultEncoding) => {
		const value = <IID3V2.FrameValue.Text>frame.value;
		const enc = getWriteTextEncoding(frame, head, defaultEncoding);
		await stream.writeEncoding(enc);
		const list = value.text.split('/');
		for (const s of list) {
			await stream.writeStringTerminated(s, enc);
		}
	},
	simplify: (value: IID3V2.FrameValue.Text) => {
		if (value && value.text && value.text.length > 0) {
			return value.text;
		}
		return null;
	}
};