@infinito/id3/src/get.tagbuf.js

ID3 Tag Reader/Writer

import fs from 'fs';

import {constants} from './constants.js';

import validID3 from './valid.js';

export default function getTagBuffer(path) {
	if(typeof path!="string") {
		throw new TypeError('parameter path must be a string');
	}
	if(!(fs.existsSync(path))) {
		throw new Error(`${path} not found`);
	}
	const fd = fs.openSync(path,'r');
	let buf = new Uint8Array(constants.ID3_HEADER_LENGTH_BYTES);
	if(fs.readSync(fd,buf,0,constants.ID3_HEADER_LENGTH_BYTES,0)!=constants.ID3_HEADER_LENGTH_BYTES) {
		throw new Error('fs.readSync failed');
	}
	const tagInfo = validID3(buf.buffer);
	buf = new Uint8Array(tagInfo.size+constants.ID3_HEADER_LENGTH_BYTES);
	if(fs.readSync(fd,buf,0,tagInfo.size+constants.ID3_HEADER_LENGTH_BYTES,0)!=tagInfo.size+constants.ID3_HEADER_LENGTH_BYTES) {
		throw new Error('fs.readSync failed');
	}
	return buf;
}