Class: Zip::DecryptedIo

Inherits:
Object
  • Object
show all
Defined in:
lib/zip/crypto/decrypted_io.rb

Overview

:nodoc:all

Constant Summary collapse

CHUNK_SIZE = 
32_768

Instance Method Summary collapse

Constructor Details

#initialize(io, decrypter, compressed_size) ⇒ DecryptedIo

Returns a new instance of DecryptedIo.



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# File 'lib/zip/crypto/decrypted_io.rb', line 7

def initialize(io, decrypter, compressed_size)
  @io = io
  @decrypter = decrypter
  @offset = io.tell
  @compressed_size = compressed_size
end

Instance Method Details

#read(length = nil, outbuf = +'')) ⇒ Object 



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# File 'lib/zip/crypto/decrypted_io.rb', line 14

def read(length = nil, outbuf = +'')
  return (length.nil? || length.zero? ? '' : nil) if eof

  while length.nil? || (buffer.bytesize < length)
    break if input_finished?

    buffer << produce_input
  end

  if @decrypter.kind_of?(::Zip::AESDecrypter) && input_finished?
    @decrypter.check_integrity(@io.read(::Zip::AESEncryption::AUTHENTICATION_CODE_LENGTH))
  end

  outbuf.replace(buffer.slice!(0...(length || buffer.bytesize)))
end