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) ⇒ Deflater

Returns a new instance of Deflater.


4
5
6
7
8
9
10
# File 'lib/zip/deflater.rb', line 4

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

Instance Attribute Details

#crcObject (readonly)

Returns the value of attribute crc


23
24
25
# File 'lib/zip/deflater.rb', line 23

def crc
  @crc
end

#sizeObject (readonly)

Returns the value of attribute size


23
24
25
# File 'lib/zip/deflater.rb', line 23

def size
  @size
end

Instance Method Details

#<<(data) ⇒ Object


12
13
14
15
16
17
# File 'lib/zip/deflater.rb', line 12

def << (data)
  val   = data.to_s
  @crc  = Zlib::crc32(val, @crc)
  @size += val.bytesize
  @output_stream << @zlib_deflater.deflate(data)
end

#finishObject


19
20
21
# File 'lib/zip/deflater.rb', line 19

def finish
  @output_stream << @zlib_deflater.finish until @zlib_deflater.finished?
end