Class: ChunkyPNG::Chunk

Inherits:
Object
  • Object
show all
Defined in:
lib/chunky_png/chunk.rb

Defined Under Namespace

Classes: Base, End, Generic, Header, ImageData, Palette, Transparency

Constant Summary collapse

CHUNK_TYPES =

Maps chunk types to classes. If a chunk type is not given in this hash, a generic chunk type will be used.

{
  'IHDR' => Header, 'IEND' => End, 'IDAT' => ImageData, 'PLTE' => Palette, 'tRNS' => Transparency
}

Class Method Summary collapse

Class Method Details

.read(io) ⇒ Object 



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# File 'lib/chunky_png/chunk.rb', line 4

def self.read(io)

  length, type = io.read(8).unpack('Na4')
  content      = io.read(length)
  crc          = io.read(4).unpack('N').first
  
  # verify_crc!(type, content, crc)
  
  CHUNK_TYPES.fetch(type, Generic).read(type, content)
end