class PCO::URL::Encryption::Chunk
Public Class Methods
new(bytes)
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# File lib/pco/url/encryption.rb, line 38 def initialize(bytes) @bytes = bytes end
Public Instance Methods
decode()
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# File lib/pco/url/encryption.rb, line 42 def decode # rubocop:disable Metrics/AbcSize bytes = @bytes.take_while { |c| c != 61 } # strip padding bytes = bytes.find_all { |b| !TABLE.index(b.chr).nil? } # remove invalid characters n = (bytes.length * 5.0 / 8.0).floor p = bytes.length < 8 ? 5 - (n * 8) % 5 : 0 c = bytes.inject(0) { |m, o| (m << 5) + TABLE.index(o.chr) } >> p (0..(n - 1)).to_a.reverse.collect { |i| ((c >> i * 8) & 0xff).chr } end
encode()
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# File lib/pco/url/encryption.rb, line 51 def encode # rubocop:disable Metrics/AbcSize n = (@bytes.length * 8.0 / 5.0).ceil p = n < 8 ? 5 - (@bytes.length * 8) % 5 : 0 c = @bytes.inject(0) { |m, o| (m << 8) + o } << p [ (0..(n - 1)).to_a.reverse.collect { |i| TABLE[(c >> i * 5) & 0x1f].chr }, ("=" * (8 - n)) ] end