Module: Base85::Standard

Extended by:
ModuleMethods
Defined in:
lib/base85/standard.rb

Overview

Standard base85 encoding. This encoding uses ! to u ASCII characters to encode data.

Constant Summary collapse

BASE_ASCII_VALUE =

ASCII value for character !

"!".ord

Constants included from ModuleMethods

ModuleMethods::LUT

Class Method Summary collapse

Methods included from ModuleMethods

decode, encode, encode_word

Class Method Details

.decode_char(char) ⇒ Integer

Decode a character from standard base85 and give its index in alphabet

Parameters:

  • char (String) —

    a character from base85 alphabet

Returns:

  • (Integer) —

    index of this character in alphabet

Raises:

  • DecodeError char is not known in alphabet



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# File 'lib/base85/standard.rb', line 23

def self.decode_char(char)
  case char
  when "!".."u" # rubocop:disable Lint/MixedCaseRange
    char.ord - BASE_ASCII_VALUE
  else
    raise DecodeError, "unknown character '#{char}'"
  end
end

.encode_value(value) ⇒ String

Encode a value (0..84 integer) to a standard base85 character

Parameters:

  • value (Integer)

Returns:

  • (String) 


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# File 'lib/base85/standard.rb', line 15

def self.encode_value(value)
  (BASE_ASCII_VALUE + value).chr
end