* enc/trans/utf_16_32.trans: raise error on unpaired upper

surrogates.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29891 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Nov 24 03:21:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* enc/trans/utf_16_32.trans: raise error on unpaired upper
+	  surrogates.
+
 Wed Nov 24 01:40:23 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* enc/utf_16_32.h: add UTF-16 and UTF-32 as a dummy encoding.

enc/trans/utf_16_32.trans

@@ -289,20 +289,20 @@ fun_si_from_utf_16(void *statep, const unsigned char *s, size_t l)
         }
         break;
     case BE:
-        if (0xD8 <= s[0] && s[0] <= 0xDB) {
-            return (VALUE)from_UTF_16BE_D8toDB_00toFF;
-        }
-        else {
+        if (s[0] < 0xD8 && 0xDF < s[0]) {
             return (VALUE)FUNso;
         }
+        else if (s[0] <= 0xDB) {
+            return (VALUE)from_UTF_16BE_D8toDB_00toFF;
+        }
         break;
     case LE:
-        if (0xD8 <= s[1] && s[1] <= 0xDB) {
-            return (VALUE)from_UTF_16LE_00toFF_D8toDB;
-        }
-        else {
+        if (s[1] < 0xD8 && 0xDF < s[1]) {
             return (VALUE)FUNso;
         }
+        else if (s[1] <= 0xDB) {
+            return (VALUE)from_UTF_16LE_00toFF_D8toDB;
+        }
         break;
     }
     return (VALUE)INVALID;

test/ruby/test_transcode.rb

@@ -1023,6 +1023,8 @@ class TestTranscode < Test::Unit::TestCase
     expected = "\u{3042}\u{3044}\u{20bb7}"
     assert_equal(expected, %w/fffe4230443042d8b7df/.pack("H*").encode("UTF-8","UTF-16"))
     assert_equal(expected, %w/feff30423044d842dfb7/.pack("H*").encode("UTF-8","UTF-16"))
+    assert_raise(Encoding::InvalidByteSequenceError){%w/feffdfb7/.pack("H*").encode("UTF-8","UTF-16"))
+    assert_raise(Encoding::InvalidByteSequenceError){%w/fffeb7df/.pack("H*").encode("UTF-8","UTF-16"))
   end
 
   def check_utf_32_both_ways(utf8, raw)