Class: Zip::Deflater

Inherits:
Compressor show all
Defined in:
lib/zip/deflater.rb

Overview

:nodoc:all

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output_stream, level = Zip.default_compression, encrypter = NullEncrypter.new) ⇒ Deflater

Returns a new instance of Deflater


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# File 'lib/zip/deflater.rb', line 3

def initialize(output_stream, level = Zip.default_compression, encrypter = NullEncrypter.new)
  super()
  @output_stream = output_stream
  @zlib_deflater = ::Zlib::Deflate.new(level, -::Zlib::MAX_WBITS)
  @size          = 0
  @crc           = ::Zlib.crc32
  @encrypter     = encrypter
end

Instance Attribute Details

#crcObject (readonly)

Returns the value of attribute crc


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# File 'lib/zip/deflater.rb', line 28

def crc
  @crc
end

#sizeObject (readonly)

Returns the value of attribute size


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# File 'lib/zip/deflater.rb', line 28

def size
  @size
end

Instance Method Details

#<<(data) ⇒ Object


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# File 'lib/zip/deflater.rb', line 12

def <<(data)
  val   = data.to_s
  @crc  = Zlib.crc32(val, @crc)
  @size += val.bytesize
  buffer = @zlib_deflater.deflate(data)
  if buffer.empty?
    @output_stream
  else
    @output_stream << @encrypter.encrypt(buffer)
  end
end

#finishObject


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# File 'lib/zip/deflater.rb', line 24

def finish
  @output_stream << @encrypter.encrypt(@zlib_deflater.finish) until @zlib_deflater.finished?
end