Class: ImageSpec::Parser::PNG

Inherits:
Object
  • Object
show all
Defined in:
lib/parser/png.rb

Constant Summary collapse

CONTENT_TYPE = 
'image/png'

Class Method Summary collapse

Class Method Details

.attributes(stream) ⇒ Object 



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# File 'lib/parser/png.rb', line 8

def self.attributes(stream)
  width, height = dimensions(stream)
  {:width => width, :height => height, :content_type => CONTENT_TYPE}
end

.detected?(stream) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/parser/png.rb', line 13

def self.detected?(stream)
  stream.rewind
  stream.read(4) == "\x89PNG"
end

.dimensions(stream) ⇒ Object 



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# File 'lib/parser/png.rb', line 18

def self.dimensions(stream)
  stream.seek(0x10)
  stream.read(8).unpack('NN')
end