@phaserjs/phaser/utils/base64/ArrayBufferToBase64.js

Phaser 4

/**
 * @author       Niklas von Hertzen (https://github.com/niklasvh/base64-arraybuffer)
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
export function ArrayBufferToBase64(arrayBuffer, mediaType) {
  const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  const bytes = new Uint8Array(arrayBuffer);
  const len = bytes.length;
  let base64 = mediaType ? "data:" + mediaType + ";base64," : "";
  for (let i = 0; i < len; i += 3) {
    base64 += chars[bytes[i] >> 2];
    base64 += chars[(bytes[i] & 3) << 4 | bytes[i + 1] >> 4];
    base64 += chars[(bytes[i + 1] & 15) << 2 | bytes[i + 2] >> 6];
    base64 += chars[bytes[i + 2] & 63];
  }
  if (len % 3 === 2) {
    base64 = base64.substring(0, base64.length - 1) + "=";
  } else if (len % 3 === 1) {
    base64 = base64.substring(0, base64.length - 2) + "==";
  }
  return base64;
}