# frozen_string_literal: false

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require 'digest.so'

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module Digest

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# A mutex for Digest().

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REQUIRE_MUTEX = Thread::Mutex.new

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def self.const_missing(name) # :nodoc:

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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

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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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# Optional arguments are passed to the constructor of the digest

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# class.

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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, *args)

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new(*args).file(name)

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end

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# Returns the base64 encoded hash value of a given _string_. The

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# return value is properly padded with '=' and contains no line

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# feeds.

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def self.base64digest(str, *args)

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[digest(str, *args)].pack('m0')

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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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# If none is given, returns the resulting hash value of the digest

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# in a base64 encoded form, keeping the digest's state.

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#

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# If a +string+ is given, returns the hash value for the given

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# +string+ in a base64 encoded form, resetting the digest to the

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# initial state before and after the process.

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#

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# In either case, the return value is properly padded with '=' and

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# contains no line feeds.

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def base64digest(str = nil)

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[str ? digest(str) : digest].pack('m0')

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end

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# Returns the resulting hash value and resets the digest to the

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# initial state.

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def base64digest!

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[digest!].pack('m0')

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end

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end

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end

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# call-seq:

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# Digest(name) -> digest_subclass

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#

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# Returns a Digest subclass by +name+ in a thread-safe manner even

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# when on-demand loading is involved.

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#

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# require 'digest'

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#

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# Digest("MD5")

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# # => Digest::MD5

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#

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# Digest(:SHA256)

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# # => Digest::SHA256

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#

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# Digest(:Foo)

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# # => LoadError: library not found for class Digest::Foo -- digest/foo

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def Digest(name)

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const = name.to_sym

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Digest::REQUIRE_MUTEX.synchronize {

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# Ignore autoload's because it is void when we have #const_missing

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Digest.const_missing(const)

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}

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rescue LoadError

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# Constants do not necessarily rely on digest/*.

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if Digest.const_defined?(const)

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Digest.const_get(const)

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else

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raise

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end

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end

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