@infinito/id3/src/get/id3.2.3.js

ID3 Tag Reader/Writer

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

import id3Tag from '../classes/id3tag.js';
import id3v2_3Frame from '../classes/id3.2.3.frame.js';

export default function getID3v2_3(path,buf,subver,flags,size) {
	if(!(buf instanceof ArrayBuffer)) {
		throw new TypeError('parameter buf must be an instance of an ArrayBuffer');
	}
	var pos = constants.ID3_HEADER_LENGTH_BYTES;
	/* Check flags */
	if(flags&0x80>0) {//Unsynchronization Flag
		
	}
	if(flags&0x40>0) {//Extended Header Flag
		console.error(path);
		console.log(flags);
		console.log(flags&0x80);
		throw new Error("Extended header flag not implemented");
		return false;
	}
	if(flags&0x20>0) {//Experimental Flag set
		
	}
	const {FRAME_ID_SIZE_BYTES,FRAME_SIZE_BYTES,FRAME_HEADER_SIZE_BYTES} = new id3v2_3Frame('default');
	var tags = new id3Tag(path);
	while(pos<size) {
		try {
			var frame = new id3v2_3Frame(buf,pos);
		} catch(error) {
			let skip = 0;
			let tempbuf = new Uint8Array(buf,pos+FRAME_ID_SIZE_BYTES,FRAME_SIZE_BYTES);
			for(let i=0;i<FRAME_SIZE_BYTES;i++) {
				skip<<=8;
				skip += tempbuf[i];
			}
			if(skip==0) {//Check for padding
				let tempbuf = new Uint8Array(buf,pos,(size-pos));
				for(let i=0;i<tempbuf.length;i++) {
					if(tempbuf[i]!=0) {
						throw new Error(error);
						return false;
					}
				}
				pos = size;
				break;
			} else {
				pos += skip+FRAME_HEADER_SIZE_BYTES;
				continue;
			}
		}
		pos += frame.size+FRAME_HEADER_SIZE_BYTES;
		try {
			frame.add_to_ID3(tags);
		} catch(error) {
			throw new Error(error);
			return false;
		}
	}
	return tags;
}