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javascript binary string to base64

Aditya Pratap Singh answered on August 12, 2022 Popularity 10/10 Helpfulness 5/10

answer javascript binary string to base64

javascript binary string to base64

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//bit string -> BigInt -> array of byte-sized ints -> binary string -> base64
//base64 -> binary string -> array of byte-sized bit strings -> bit string

const encode = bitstr => {
  const bytes = [];
  // convert bit string to BigInt
  let value = BigInt('0b' + bitstr);
  // chop it up into bytes
  while (value > 0n) {
    bytes.unshift(Number(value & 0xffn));
    value >>= 8n;
  }
  // convert to binary string and encode as base64
  return btoa(String.fromCharCode.apply(null, bytes));
};

const decode = b64 => {
  // decode base64 to binary string
  const bstr = atob(b64);
  // convert binary string to bit string
  return new Array(bstr.length).fill(0).map(
    (_,i) => bstr.charCodeAt(i).toString(2).padStart(8, i ? '0' : '')
  ).join('');
};

const bitstr = '100110110101000110100011011001100010110100011011001100100110100011000001100000110000011000001100001001010100111110000011001111100101010011111010011100010110001001001001100000110100111010010100111110000111001000100000110001001000101100111110011001001001101011010001011001001101001010000011000100100100110000011010011';
const encoded = encode(bitstr);
const decoded = decode(encoded);

console.log(bitstr);
console.log(encoded);
console.log(decoded);
 Run code snippet

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: base64 binary-string javascript

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Contributed on Aug 12 2022

Aditya Pratap Singh

0 Answers Avg Quality 2/10

javascript binary string to base64

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