Class: LZString::Base64

Inherits:
Object
  • Object
show all
Defined in:
lib/lz_string/base64.rb

Overview

Base64 compressing algorithm.

Constant Summary collapse

KEY_STR_BASE64 =

Base64 alphabet.

"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="

Class Method Summary collapse

Class Method Details

.compress(input) ⇒ Object

Parameters:

  • input (String) 


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# File 'lib/lz_string/base64.rb', line 8

def self.compress(input)
  return "" if input.nil?

  res = LZString::Base.compress(input, 6, lambda { |a| KEY_STR_BASE64[a] })

  # To produce valid Base64
  case (res.length % 4)
  when 0 then res
  when 1 then res + "==="
  when 2 then res + "=="
  when 3 then res + "="
  end
end

.decompress(compressed) ⇒ Object

Parameters:

  • compressed (String) 


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# File 'lib/lz_string/base64.rb', line 23

def self.decompress(compressed)
  return "" if compressed.nil?
  return nil if compressed == ""

  LZString::Base.decompress(
    compressed.length,
    32,
    lambda { |index| get_base_value(KEY_STR_BASE64, compressed[index]) }
  )
end