Remove BufferedIO due to performance issues, introduce new Reader class

Author: buty4649

mrblib/rf/buffered_io.rb

@@ -0,0 +1,28 @@
+module Rf
+  class Reader
+    def initialize(file_name, mode = 'r')
+      @file = file_name == '-' ? $stdin : File.open(file_name, mode)
+      @binary = false
+    end
+
+    def binary?
+      @binary
+    end
+
+    def gets
+      line = @file.readline
+      @binary = true if /(?![\r\n\t])\p{Cntrl}/.match?(line)
+      line
+    rescue EOFError
+      nil
+    end
+
+    def read
+      @file.read
+    end
+
+    def close
+      @file.close
+    end
+  end
+end

mrblib/rf/reader.rb

@@ -77,7 +77,7 @@ def run # rubocop:disable Metrics/AbcSize
     def read_open(file)
       raise IsDirectory, file if File.directory?(file)
 
-      BufferedIO.new(file)
+      Reader.new(file)
     rescue Errno::ENOENT
       raise NotFound, file
     rescue Errno::EACCES