From 817afbd987d35e4d65f599270f3b42777698556f Mon Sep 17 00:00:00 2001
From: knu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 25 Oct 2006 08:54:05 +0000
Subject: * ext/digest, test/digest/test_digest.rb: Merge from trunk:   -
 Introduce versioning in Digest::Base API, and prefix C     constants with
 RUBY_ and C type names with rb_ to avoid name     clash in writing
 extensions.   - Introduce Digest::Class and Digest::Instance for ease of    
 implementing subclasses and add-ons.   - Digest::Instance module requires and
 assumes that any instance     be resettable and clonable.  An instance method
 #new() is     added so digest instances work just like digest classes.   -
 The constructor does no longer take an initial string to feed;     digest()
 and hexdigest() now do, instead.  This allows digest     classes to take
 their own hashing parameters.   - Make some changes to digest() and
 hexdigest() class methods,     which now take extra arguments, which are
 passed through to     the constructor in an internal call.   - Add
 #digest_length/size/length() and #block_length(),   - Add the Digest::SHA2
 class to wrap up SHA2 variants: SHA256,     SHA384 and SHA512, hoping this
 module would make a decent     example of a digest subclass written in Ruby. 
  - Rip BubbleBabble support out of the base class and have a     separate
 module named digest/bubblebabble.   - Remove RD documents in favor of newly
 written and embedded     RDoc documentation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@11223 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/digest/lib/digest.rb | 41 ++++++++++++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 11 deletions(-)

(limited to 'ext/digest/lib/digest.rb')

diff --git a/ext/digest/lib/digest.rb b/ext/digest/lib/digest.rb
index c277a0eea5..578c6f53d4 100644
--- a/ext/digest/lib/digest.rb
+++ b/ext/digest/lib/digest.rb
@@ -1,27 +1,46 @@
 require 'digest.so'
 
 module Digest
-  autoload "MD5", "digest/md5"
-  autoload "RMD160", "digest/rmd160"
-  autoload "SHA1", "digest/sha1"
-  autoload "SHA256", "digest/sha2"
-  autoload "SHA384", "digest/sha2"
-  autoload "SHA512", "digest/sha2"
+  autoload "SHA256", "digest/sha2.so"
+  autoload "SHA384", "digest/sha2.so"
+  autoload "SHA512", "digest/sha2.so"
 
-  class Base
-    # creates a digest object and read given file, _name_.
+  def self.const_missing(name)
+    begin
+      require File.join('digest', name.to_s.downcase)
+
+      return Digest.const_get(name) if Digest.const_defined?(name)
+    rescue LoadError => e
+    end
+
+    raise NameError, "Digest class not found: Digest::#{name}"
+  end
+
+  class ::Digest::Class
+    # creates a digest object and reads a given file, _name_.
     # 
     #  p Digest::SHA256.file("X11R6.8.2-src.tar.bz2").hexdigest
     #  # => "f02e3c85572dc9ad7cb77c2a638e3be24cc1b5bea9fdbb0b0299c9668475c534"
     def self.file(name)
-      digest = self.new
+      new.file(name)
+    end
+  end
+
+  module Instance
+    # updates the digest with the contents of a given file _name_ and
+    # returns self.
+    def file(name)
       File.open(name, "rb") {|f|
         buf = ""
         while f.read(16384, buf)
-          digest.update buf
+          update buf
         end
       }
-      digest
+      self
     end
   end
 end
+
+def Digest(name)
+  Digest.const_get(name)
+end
-- 
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