Class: NearApi::Base58

Inherits:
Object
  • Object
show all
Defined in:
lib/near_api/base58.rb

Constant Summary collapse

BASE = 
'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'

Class Method Summary collapse

Class Method Details

.decode(encoded_string) ⇒ Object 



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# File 'lib/near_api/base58.rb', line 15

def self.decode(encoded_string)
  integer = toi encoded_string
  nzeroes = encoded_string.chars.find_index { |c| c != BASE[0] } || encoded_string.length - 1
  prefix = nzeroes < 0 ? '' : 0.chr * nzeroes
  prefix + to_bytestring(integer)
end

.encode(bytestring) ⇒ Object 



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# File 'lib/near_api/base58.rb', line 6

def self.encode(bytestring)
  number = bytestring.unpack('C*').reverse.each_with_index.inject(0) do |sum, (byte, index)|
    sum + byte * (256**index)
  end
  nzeroes = bytestring.bytes.find_index { |b| b != 0 } || bytestring.length - 1
  prefix = BASE[0] * nzeroes
  prefix + tos(number)
end

.to_bytestring(number) ⇒ Object 



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# File 'lib/near_api/base58.rb', line 45

def self.to_bytestring(number)
  return 0.chr if number == 0

  integer = number
  result = ''
  while integer > 0
    integer, remain = integer.divmod(256)
    result = remain.chr + result
  end
  result
end

.toi(string = to_s, base = 58, digits = BASE) ⇒ Object 



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# File 'lib/near_api/base58.rb', line 22

def self.toi(string = to_s, base = 58, digits = BASE)
  return nil if string.empty?

  integer = 0
  string.each_char do |c|
    index = digits.index(c)
    integer = integer * base + index
  end
  integer
end

.tos(integer = to_i, base = 58, digits = BASE) ⇒ Object 



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# File 'lib/near_api/base58.rb', line 33

def self.tos(integer = to_i, base = 58, digits = BASE)
  return '' if integer.nil?
  return digits[0] if integer == 0

  string = ''
  while integer > 0
    integer, index = integer.divmod(base)
    string = digits[index] + string
  end
  string
end