123456789101112131415161718192021222324252627


const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';const map = new Uint8Array(256);
for (let i = 0; i < chars.length; i++) {  map[chars.charCodeAt(i)] = i;}
export function base64Decode (data: string): Uint8Array {  const bytes = [];  let byte = 0;  let bits = 0;
  for (let i = 0; i < data.length && data[i] !== '='; i++) {    // each character represents 6 bits    byte = (byte << 6) | map[data.charCodeAt(i)];
    // each byte needs to contain 8 bits    if ((bits += 6) >= 8) {      bytes.push((byte >>> (bits -= 8)) & 0xff);    }  }
  return Uint8Array.from(bytes);}