class ChunkyPNG::Datastream

def verify_signature!(io)

Raises:

(RuntimeError) - An exception is raised if the PNG signature is not found at

def verify_signature!(io)
  signature = io.read(ChunkyPNG::Datastream::SIGNATURE.length)
  raise "PNG signature not found!" unless signature == ChunkyPNG::Datastream::SIGNATURE
end

Instance Methods