Zazama / node-id3

import * as ID3Util from "../ID3Util"

import { WriteTags } from "../types/Tags"

import { isFunction } from  "../util"

import { createBufferFromTags } from "../TagsHelpers"

export type CreateCallback =

    (data: Buffer) => void

/**

 * Creates a buffer containing the ID3 Tag

 */

export function create(tags: WriteTags): Buffer

export function create(tags: WriteTags, callback: CreateCallback): void

export function create(tags: WriteTags, callback?: CreateCallback) {

    const frames = createBufferFromTags(tags)

    //  Create ID3 header

    const header = Buffer.alloc(10)

    header.fill(0)

    header.write("ID3", 0)              //File identifier

    header.writeUInt16BE(0x0300, 3)     //Version 2.3.0  --  03 00

    header.writeUInt16BE(0x0000, 5)     //Flags 00

    ID3Util.encodeSize(frames.length).copy(header, 6)

    const id3Data = Buffer.concat([header, frames])

    if (isFunction(callback)) {

        return callback(id3Data)

    }

    return id3Data

}