class ChunkyPNG::Chunk::End

The End (IEND) chunk indicates the last chunk of a PNG stream. It does not contain any data.

Public Class Methods

new() click to toggle source
Calls superclass method ChunkyPNG::Chunk::Base.new
# File lib/chunky_png/chunk.rb, line 151
def initialize
  super('IEND')
end
read(type, content) click to toggle source

Reads the END chunk. It will check if the content is empty. @param [String] type The four character chunk type indicator (= “IEND”). @param [String] content The content read from the chunk. Should be empty. @return [ChunkyPNG::Chunk::End] The new End chunk instance. @raise [RuntimeError] Raises an exception if the content was not empty.

# File lib/chunky_png/chunk.rb, line 160
def self.read(type, content)
  raise ExpectationFailed, 'The IEND chunk should be empty!' if content.bytesize > 0
  self.new
end

Public Instance Methods

content() click to toggle source

Returns an empty string, because this chunk should always be empty. @return [“”] An empty string.

# File lib/chunky_png/chunk.rb, line 167
def content
  ChunkyPNG::Datastream.empty_bytearray
end