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diff --git a/ruby_1_9_3/lib/rubygems/old_format.rb b/ruby_1_9_3/lib/rubygems/old_format.rb
new file mode 100644
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+++ b/ruby_1_9_3/lib/rubygems/old_format.rb
@@ -0,0 +1,153 @@
+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'rubygems'
+
+##
+# The format class knows the guts of the RubyGem .gem file format and provides
+# the capability to read gem files
+
+class Gem::OldFormat
+
+  attr_accessor :spec, :file_entries, :gem_path
+
+  ##
+  # Constructs an instance of a Format object, representing the gem's data
+  # structure.
+  #
+  # gem:: [String] The file name of the gem
+
+  def initialize(gem_path)
+    require 'fileutils'
+    require 'zlib'
+    Gem.load_yaml
+
+    @gem_path = gem_path
+  end
+
+  ##
+  # Reads the named gem file and returns a Format object, representing the
+  # data from the gem file
+  #
+  # file_path:: [String] Path to the gem file
+
+  def self.from_file_by_path(file_path)
+    unless File.exist?(file_path)
+      raise Gem::Exception, "Cannot load gem file [#{file_path}]"
+    end
+
+    File.open(file_path, 'rb') do |file|
+      from_io(file, file_path)
+    end
+  end
+
+  ##
+  # Reads a gem from an io stream and returns a Format object, representing
+  # the data from the gem file
+  #
+  # io:: [IO] Stream from which to read the gem
+
+  def self.from_io(io, gem_path="(io)")
+    format = self.new(gem_path)
+    skip_ruby(io)
+    format.spec = read_spec(io)
+    format.file_entries = []
+    read_files_from_gem(io) do |entry, file_data|
+      format.file_entries << [entry, file_data]
+    end
+    format
+  end
+
+  private
+
+  ##
+  # Skips the Ruby self-install header.  After calling this method, the
+  # IO index will be set after the Ruby code.
+  #
+  # file:: [IO] The IO to process (skip the Ruby code)
+
+  def self.skip_ruby(file)
+    end_seen = false
+    loop {
+      line = file.gets
+      if(line == nil || line.chomp == "__END__") then
+        end_seen = true
+        break
+      end
+    }
+
+    if end_seen == false then
+      raise Gem::Exception.new("Failed to find end of ruby script while reading gem")
+    end
+  end
+
+  ##
+  # Reads the specification YAML from the supplied IO and constructs
+  # a Gem::Specification from it.  After calling this method, the
+  # IO index will be set after the specification header.
+  #
+  # file:: [IO] The IO to process
+
+  def self.read_spec(file)
+    yaml = ''
+
+    read_until_dashes file do |line|
+      yaml << line
+    end
+
+    Gem::Specification.from_yaml yaml
+  rescue YAML::Error => e
+    raise Gem::Exception, "Failed to parse gem specification out of gem file"
+  rescue ArgumentError => e
+    raise Gem::Exception, "Failed to parse gem specification out of gem file"
+  end
+
+  ##
+  # Reads lines from the supplied IO until a end-of-yaml (---) is
+  # reached
+  #
+  # file:: [IO] The IO to process
+  # block:: [String] The read line
+
+  def self.read_until_dashes(file)
+    while((line = file.gets) && line.chomp.strip != "---") do
+      yield line
+    end
+  end
+
+  ##
+  # Reads the embedded file data from a gem file, yielding an entry
+  # containing metadata about the file and the file contents themselves
+  # for each file that's archived in the gem.
+  # NOTE: Many of these methods should be extracted into some kind of
+  # Gem file read/writer
+  #
+  # gem_file:: [IO] The IO to process
+
+  def self.read_files_from_gem(gem_file)
+    errstr = "Error reading files from gem"
+    header_yaml = ''
+    begin
+      self.read_until_dashes(gem_file) do |line|
+        header_yaml << line
+      end
+      header = YAML.load(header_yaml)
+      raise Gem::Exception, errstr unless header
+
+      header.each do |entry|
+        file_data = ''
+        self.read_until_dashes(gem_file) do |line|
+          file_data << line
+        end
+        yield [entry, Zlib::Inflate.inflate(file_data.strip.unpack("m")[0])]
+      end
+    rescue Zlib::DataError
+      raise Gem::Exception, errstr
+    end
+  end
+
+end
+