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ðŸ“ ..
ðŸ“„ digest_io.rb(1.33 KB)
ðŸ“„ file_source.rb(599 B)
ðŸ“„ io_source.rb(769 B)
ðŸ“„ old.rb(3.86 KB)
ðŸ“„ source.rb(72 B)
ðŸ“„ tar_header.rb(5.52 KB)
ðŸ“ tar_reader
ðŸ“„ tar_reader.rb(2.39 KB)
ðŸ“„ tar_test_case.rb(3.85 KB)
ðŸ“„ tar_writer.rb(7.57 KB)

Editing: digest_io.rb

# frozen_string_literal: true
##
# IO wrapper that creates digests of contents written to the IO it wraps.

class Gem::Package::DigestIO

##
  # Collected digests for wrapped writes.
  #
  #   {
  #     'SHA1'   => #<OpenSSL::Digest: [...]>,
  #     'SHA512' => #<OpenSSL::Digest: [...]>,
  #   }

attr_reader :digests

##
  # Wraps +io+ and updates digest for each of the digest algorithms in
  # the +digests+ Hash.  Returns the digests hash.  Example:
  #
  #   io = StringIO.new
  #   digests = {
  #     'SHA1'   => OpenSSL::Digest.new('SHA1'),
  #     'SHA512' => OpenSSL::Digest.new('SHA512'),
  #   }
  #
  #   Gem::Package::DigestIO.wrap io, digests do |digest_io|
  #     digest_io.write "hello"
  #   end
  #
  #   digests['SHA1'].hexdigest   #=> "aaf4c61d[...]"
  #   digests['SHA512'].hexdigest #=> "9b71d224[...]"

def self.wrap io, digests
    digest_io = new io, digests

yield digest_io

return digests
  end

##
  # Creates a new DigestIO instance.  Using ::wrap is recommended, see the
  # ::wrap documentation for documentation of +io+ and +digests+.

def initialize io, digests
    @io = io
    @digests = digests
  end

##
  # Writes +data+ to the underlying IO and updates the digests

def write data
    result = @io.write data

@digests.each do |_, digest|
      digest << data
    end

result
  end

end

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Editing: digest_io.rb

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