Class: Cryptopunks::ImageComposite

Inherits:
Pixelart::ImageComposite
  • Object
show all
Defined in:
lib/cryptopunks/composite.rb

Overview

note: was Image::Composite

Constant Summary collapse

PUNK_HASH = 
'ac39af4793119ee46bbff351d8cb6b5f23da60222126add4268e261199a2921b'
PUNK_HEIGHT = 
24
PUNK_WIDTH = 
24

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, width: PUNK_WIDTH, height: PUNK_HEIGHT) ⇒ ImageComposite

Returns a new instance of ImageComposite.



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# File 'lib/cryptopunks/composite.rb', line 32

def initialize( *args, width:  PUNK_WIDTH,
                       height: PUNK_HEIGHT )
  super
end

Class Method Details

.read(path = './punks.png', width: PUNK_WIDTH, height: PUNK_HEIGHT) ⇒ Object 



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# File 'lib/cryptopunks/composite.rb', line 16

def self.read( path='./punks.png', width: PUNK_WIDTH, height: PUNK_HEIGHT )
  data = File.open( path, 'rb' ) { |f| f.read }

  hexdigest = sha256( data )   ## check sha256 checksum
  if hexdigest == PUNK_HASH
     puts "     >#{hexdigest}< SHA256 hash matching"
     puts "         ✓ True Official Genuine CryptoPunks™ verified"
  else
     puts "         ✓ True Official Genuine Yes, You Can! Punks Not Dead™ verified"
  end

  img = ChunkyPNG::Image.from_blob( data )
  new( img, width: width, height: height )
end

.sha256(data) ⇒ Object 



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# File 'lib/cryptopunks/composite.rb', line 7

def self.sha256( data )
  ## todo/check: or just use Digest::SHA256.hexdigest - why? why not?
  Digest::SHA256.digest( data ).unpack( 'H*' )[0]
end