chedder/src/near-api/utils/bs58.ts

chedder-cli

  const ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';

  let i = 0;
  let ALPHABET_MAP:Record<string,number>={}
  while (i < ALPHABET.length) {
    ALPHABET_MAP[ALPHABET.charAt(i)] = i;
    i++;
  }

  export function encode(buffer:Uint8Array) :string {

    var carry, digits, j;
    if (buffer.length === 0) {
      return '';
    }
    i =  0;
    j =  0;
    digits = [0];
    i = 0;
    while (i < buffer.length) {
      j = 0;
      while (j < digits.length) {
        digits[j] <<= 8;
        j++;
      }
      digits[0] += buffer[i];
      carry = 0;
      j = 0;
      while (j < digits.length) {
        digits[j] += carry;
        carry = (digits[j] / 58) | 0;
        digits[j] %= 58;
        ++j;
      }
      while (carry) {
        digits.push(carry % 58);
        carry = (carry / 58) | 0;
      }
      i++;
    }
    i = 0;
    while (buffer[i] === 0 && i < buffer.length - 1) {
      digits.push(0);
      i++;
    }
    return digits
      .reverse()
      .map(function(digit) {
        return ALPHABET[digit];
      })
      .join('');
  };

  export function decode(str:string) :Uint8Array {
    if (str === undefined) {
      str = '';
    }
    var bytes, c, carry, j;
    if (str.length === 0) {
      return new Uint8Array(0);
    }
    i =  0;
    j =  0;
    bytes = [0];
    i = 0;
    while (i < str.length) {
      c = str[i];
      if (!(c in ALPHABET_MAP)) {
        throw new Error(
          "Base58.decode received unacceptable input. Character '" + c + "' is not in the Base58 alphabet.",
        );
      }
      j = 0;
      while (j < bytes.length) {
        bytes[j] *= 58;
        j++;
      }
      bytes[0] += ALPHABET_MAP[c];
      carry = 0;
      j = 0;
      while (j < bytes.length) {
        bytes[j] += carry;
        carry = bytes[j] >> 8;
        bytes[j] &= 0xff;
        ++j;
      }
      while (carry) {
        bytes.push(carry & 0xff);
        carry >>= 8;
      }
      i++;
    }
    i = 0;
    while (str[i] === '1' && i < str.length - 1) {
      bytes.push(0);
      i++;
    }
    return new Uint8Array(bytes.reverse());
  };