Zazama / node-id3

import iconv = require('iconv-lite')

import { isString } from "./util"

export function stringToEncodedBuffer(

    value: string,

    encodingByte: string | number

) {

    return iconv.encode(

        value,

        encodingFromStringOrByte(encodingByte)

    )

}

export function bufferToDecodedString(

    buffer: Buffer,

    encodingByte: string | number

) {

    return iconv.decode(

        buffer,

        encodingFromStringOrByte(encodingByte)

    ).replace(/\0/g, '')

}

function encodingFromStringOrByte(encoding: string | number) {

    const ENCODINGS = [

        'ISO-8859-1', 'UTF-16', 'UTF-16BE', 'UTF-8'

    ]

    if (isString(encoding) && ENCODINGS.includes(encoding)) {

        return encoding

    }

    if (

        typeof encoding === "number" &&

        encoding >= 0 && encoding < ENCODINGS.length

    ) {

        return ENCODINGS[encoding]

    }

    return ENCODINGS[0]

}