1 files changed, 5 insertions, 5 deletions
diff --git a/lib/rdoc/parser.rb b/lib/rdoc/parser.rb
index 27267f3d81..9cc1485422 100644
--- a/lib/rdoc/parser.rb
+++ b/lib/rdoc/parser.rb
@@ -80,14 +80,14 @@ class RDoc::Parser
 
     have_encoding = s.respond_to? :encoding
 
-    if have_encoding then
-      return false if s.encoding != Encoding::ASCII_8BIT and s.valid_encoding?
-    end
-
     return true if s[0, 2] == Marshal.dump('')[0, 2] or s.index("\x00")
 
     if have_encoding then
-      s.force_encoding Encoding.default_external
+      mode = "r"
+      s.sub!(/\A#!.*\n/, '')     # assume shebang line isn't longer than 1024.
+      encoding = s[/^\s*\#\s*(?:-\*-\s*)?(?:en)?coding:\s*\([^\s;]+?\)(?:-\*-)?/, 1]
+      mode = "r:#{encoding}" if encoding
+      s = File.open(file, mode) {|f| f.gets(nil, 1024)}
 
       not s.valid_encoding?
     else