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diff --git a/lib/cgi/session/pstore.rb b/lib/cgi/session/pstore.rb
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--- a/lib/cgi/session/pstore.rb
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-# frozen_string_literal: true
-#
-# cgi/session/pstore.rb - persistent storage of marshalled session data
-#
-# Documentation: William Webber (william@williamwebber.com)
-#
-# == Overview
-#
-# This file provides the CGI::Session::PStore class, which builds
-# persistent of session data on top of the pstore library.  See
-# cgi/session.rb for more details on session storage managers.
-
-require_relative '../session'
-require 'pstore'
-
-class CGI
-  class Session
-    # PStore-based session storage class.
-    #
-    # This builds upon the top-level PStore class provided by the
-    # library file pstore.rb.  Session data is marshalled and stored
-    # in a file.  File locking and transaction services are provided.
-    class PStore
-      # Create a new CGI::Session::PStore instance
-      #
-      # This constructor is used internally by CGI::Session.  The
-      # user does not generally need to call it directly.
-      #
-      # +session+ is the session for which this instance is being
-      # created.  The session id must only contain alphanumeric
-      # characters; automatically generated session ids observe
-      # this requirement.
-      #
-      # +option+ is a hash of options for the initializer.  The
-      # following options are recognised:
-      #
-      # tmpdir:: the directory to use for storing the PStore
-      #          file.  Defaults to Dir::tmpdir (generally "/tmp"
-      #          on Unix systems).
-      # prefix:: the prefix to add to the session id when generating
-      #          the filename for this session's PStore file.
-      #          Defaults to the empty string.
-      #
-      # This session's PStore file will be created if it does
-      # not exist, or opened if it does.
-      def initialize(session, option={})
-        option = {'suffix'=>''}.update(option)
-        path, @hash = session.new_store_file(option)
-        @p = ::PStore.new(path)
-        @p.transaction do |p|
-          File.chmod(0600, p.path)
-        end
-      end
-
-      # Restore session state from the session's PStore file.
-      #
-      # Returns the session state as a hash.
-      def restore
-        unless @hash
-          @p.transaction do
-            @hash = @p['hash'] || {}
-          end
-        end
-        @hash
-      end
-
-      # Save session state to the session's PStore file.
-      def update
-        @p.transaction do
-          @p['hash'] = @hash
-        end
-      end
-
-      # Update and close the session's PStore file.
-      def close
-        update
-      end
-
-      # Close and delete the session's PStore file.
-      def delete
-        path = @p.path
-        File::unlink path
-      end
-
-    end
-  end
-end
-# :enddoc: