require 'digest.so'

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module Digest

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def self.const_missing(name)

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case name

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when :SHA256, :SHA384, :SHA512

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lib = 'digest/sha2.so'

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else

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lib = File.join('digest', name.to_s.downcase)

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end

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begin

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require lib

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rescue LoadError => e

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raise LoadError, "library not found for class Digest::#{name} -- #{lib}", caller(1)

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end

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unless Digest.const_defined?(name)

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raise NameError, "uninitialized constant Digest::#{name}", caller(1)

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end

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Digest.const_get(name)

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end

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class ::Digest::Class

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# creates a digest object and reads a given file, _name_.

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#

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# p Digest::SHA256.file("X11R6.8.2-src.tar.bz2").hexdigest

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# # => "f02e3c85572dc9ad7cb77c2a638e3be24cc1b5bea9fdbb0b0299c9668475c534"

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def self.file(name)

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new.file(name)

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end

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end

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module Instance

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# updates the digest with the contents of a given file _name_ and

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# returns self.

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def file(name)

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File.open(name, "rb") {|f|

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buf = ""

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while f.read(16384, buf)

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update buf

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end

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}

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self

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end

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end

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end

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def Digest(name)

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Digest.const_get(name)

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end

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