invent a new error for the bad escape usage

trunk/ripnews/encode/yenc.rb

@@ -1,4 +1,4 @@
-# $Dwarf: yenc.rb,v 1.10 2004/06/16 08:14:50 ward Exp $
+# $Dwarf: yenc.rb,v 1.11 2004/10/18 08:13:47 ward Exp $
 # $Source$
 
 #
@@ -19,6 +19,8 @@
 
 require 'tempfile'
 
+class YencError < RuntimeError; end
+
 class YEnc
 class << self
 
@@ -53,10 +55,10 @@ def _ydecode_line(line)
 	ostr = ''
 	while i < ll
 		if line[i] == 0x3d
-			i += 1
-			if i == ll
-				raise PermError, "Escape char found as last char on line. This is not allowed by the yEnc standard"
+			if i == (ll - 1)
+				raise YencError, "Escape char found as last char of line. This is not allowed by the yEnc standard"
 			else
+				i += 1
 				line[i] -= 64
 			end
 		end
@@ -193,7 +195,6 @@ def _ydecode_file(file, outfile)
 	return mode, filename, outfile
 end
 
-# toch maar een keer aparte class van maken... geld ook voor dit geneuzel
 def _ydecode_array(data)
 	decode = ""
 	mode = 0600