* enc/trans/utf_16_32.trans: add a convert from UTF-8 to UTF-16.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29892 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Wed Nov 24 05:40:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* enc/trans/utf_16_32.trans: add a convert from UTF-8 to UTF-16.
+
 Wed Nov 24 03:21:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* enc/trans/utf_16_32.trans: raise error on unpaired upper

enc/trans/utf_16_32.trans

@@ -289,7 +289,7 @@ fun_si_from_utf_16(void *statep, const unsigned char *s, size_t l)
         }
         break;
     case BE:
-        if (s[0] < 0xD8 && 0xDF < s[0]) {
+        if (s[0] < 0xD8 || 0xDF < s[0]) {
             return (VALUE)FUNso;
         }
         else if (s[0] <= 0xDB) {
@@ -297,7 +297,7 @@ fun_si_from_utf_16(void *statep, const unsigned char *s, size_t l)
         }
         break;
     case LE:
-        if (s[1] < 0xD8 && 0xDF < s[1]) {
+        if (s[1] < 0xD8 || 0xDF < s[1]) {
             return (VALUE)FUNso;
         }
         else if (s[1] <= 0xDB) {
@@ -321,6 +321,19 @@ fun_so_from_utf_16(void *statep, const unsigned char *s, size_t l, unsigned char
     return 0;
 }
 
+static ssize_t
+fun_so_to_utf_16(void *statep, const unsigned char *s, size_t l, unsigned char *o, size_t osize)
+{
+    unsigned char *sp = statep;
+    if (*sp == 0) {
+        *o++ = 0xFE;
+        *o++ = 0xFF;
+        *sp = 1;
+        return 2 + fun_so_to_utf_16be(statep, s, l, o, osize);
+    }
+    return fun_so_to_utf_16be(statep, s, l, o, osize);
+}
+
 static const rb_transcoder
 rb_from_UTF_16BE = {
     "UTF-16BE", "UTF-8", from_UTF_16BE,
@@ -429,6 +442,18 @@ rb_from_UTF_16 = {
     NULL, fun_si_from_utf_16, NULL, fun_so_from_utf_16
 };
 
+static const rb_transcoder
+rb_to_UTF_16 = {
+    "UTF-8", "UTF-16", from_UTF_8,
+    TRANSCODE_TABLE_INFO,
+    1, /* input_unit_length */
+    4, /* max_input */
+    4, /* max_output */
+    asciicompat_encoder, /* asciicompat_type */
+    1, state_init, NULL, /* state_size, state_init, state_fini */
+    NULL, NULL, NULL, fun_so_to_utf_16
+};
+
 void
 Init_utf_16_32(void)
 {
@@ -441,4 +466,5 @@ Init_utf_16_32(void)
     rb_register_transcoder(&rb_from_UTF_32LE);
     rb_register_transcoder(&rb_to_UTF_32LE);
     rb_register_transcoder(&rb_from_UTF_16);
+    rb_register_transcoder(&rb_to_UTF_16);
 }

test/ruby/test_transcode.rb

@@ -1022,9 +1022,9 @@ class TestTranscode < Test::Unit::TestCase
   def test_utf_16_bom
     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"))
+    check_both_ways(expected, %w/feff30423044d842dfb7/.pack("H*"), "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)