@tronscan/client/src/lib/base58.js

Tronscan API Client

var ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
var ALPHABET_MAP = {}
for(var i = 0; i < ALPHABET.length; i++) {
  ALPHABET_MAP[ALPHABET.charAt(i)] = i
}
var BASE = 58;

/**
 *
 * @param buffer
 * @returns {string}
 */
function encode58(buffer) {
  if (buffer.length === 0) return '';

  var i, j, digits = [0];
  for (i = 0; i < buffer.length; i++) {
    for (j = 0; j < digits.length; j++) digits[j] <<= 8

    digits[0] += buffer[i];

    var carry = 0;
    for (j = 0; j < digits.length; ++j) {
      digits[j] += carry;

      carry = (digits[j] / BASE) | 0;
      digits[j] %= BASE
    }

    while (carry) {
      digits.push(carry % BASE);

      carry = (carry / BASE) | 0
    }
  }

  // deal with leading zeros
  for (i = 0; buffer[i] === 0 && i < buffer.length - 1; i++) digits.push(0)

  return digits.reverse().map(function(digit) { return ALPHABET[digit] }).join('');
}

/**
 * @param string
 * @returns number[]
 */
function decode58(string) {
  if (string.length === 0) return []

  var i, j, bytes = [0]
  for (i = 0; i < string.length; i++) {
    var c = string[i]
    if (!(c in ALPHABET_MAP)) throw new Error('Non-base58 character')

    for (j = 0; j < bytes.length; j++) bytes[j] *= BASE
    bytes[0] += ALPHABET_MAP[c]

    var carry = 0
    for (j = 0; j < bytes.length; ++j) {
      bytes[j] += carry

      carry = bytes[j] >> 8
      bytes[j] &= 0xff
    }

    while (carry) {
      bytes.push(carry & 0xff)

      carry >>= 8
    }
  }

  // deal with leading zeros
  for (i = 0; string[i] === '1' && i < string.length - 1; i++) {
    bytes.push(0)
  }

  return bytes.reverse();
}

module.exports = {
  encode58,
  decode58,
};