* enc/trans/utf_16_32.trans: add the UTF-32 converter.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29895 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Wed Nov 24 06:35:32 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* enc/trans/utf_16_32.trans: add the UTF-32 converter.
+
+Wed Nov 24 05:40:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
 Wed Nov 24 06:13:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* win32/win32.c (filecp, wstr_to_mbstr, mbstr_to_wstr):
@@ -5,7 +11,7 @@ Wed Nov 24 06:13:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 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.
+	* enc/trans/utf_16_32.trans: add a converter 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

@@ -25,6 +25,10 @@
   map["{00-ff}{00-ff}"] = :func_si
   transcode_generate_node(ActionMap.parse(map), "from_UTF_16")
 
+  map = {}
+  map["{00-ff}{00-ff}{00-ff}{00-ff}"] = :func_si
+  transcode_generate_node(ActionMap.parse(map), "from_UTF_32")
+
   map = {}
   map["{00-7f}"] = :func_so
   map["{c2-df}{80-bf}"] = :func_so
@@ -321,6 +325,48 @@ fun_so_from_utf_16(void *statep, const unsigned char *s, size_t l, unsigned char
     return 0;
 }
 
+static VALUE
+fun_si_from_utf_32(void *statep, const unsigned char *s, size_t l)
+{
+    unsigned char *sp = statep;
+    switch (*sp) {
+    case 0:
+        if (s[0] == 0 && s[1] == 0 && s[2] == 0xFE && s[3] == 0xFF) {
+            *sp = BE;
+            return ZERObt;
+        }
+        else if (s[0] == 0xFF && s[1] == 0xFE && s[2] == 0 && s[3] == 0) {
+            *sp = LE;
+            return ZERObt;
+        }
+        break;
+    case BE:
+        if (s[0] == 0 && ((0 < s[1] && s[1] <= 0x10) ||
+              (s[1] == 0 && (s[2] < 0xD8 || 0xDF < s[2]))))
+            return (VALUE)FUNso;
+        break;
+    case LE:
+        if (s[3] == 0 && ((0 < s[2] && s[2] <= 0x10) ||
+              (s[2] == 0 && (s[1] < 0xD8 || 0xDF < s[1]))))
+            return (VALUE)FUNso;
+        break;
+    }
+    return (VALUE)INVALID;
+}
+
+static ssize_t
+fun_so_from_utf_32(void *statep, const unsigned char *s, size_t l, unsigned char *o, size_t osize)
+{
+    unsigned char *sp = statep;
+    switch (*sp) {
+    case BE:
+        return fun_so_from_utf_32be(statep, s, l, o, osize);
+    case LE:
+        return fun_so_from_utf_32le(statep, s, l, o, osize);
+    }
+    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)
 {
@@ -334,6 +380,21 @@ fun_so_to_utf_16(void *statep, const unsigned char *s, size_t l, unsigned char *
     return fun_so_to_utf_16be(statep, s, l, o, osize);
 }
 
+static ssize_t
+fun_so_to_utf_32(void *statep, const unsigned char *s, size_t l, unsigned char *o, size_t osize)
+{
+    unsigned char *sp = statep;
+    if (*sp == 0) {
+        *o++ = 0x00;
+        *o++ = 0x00;
+        *o++ = 0xFE;
+        *o++ = 0xFF;
+        *sp = 1;
+        return 4 + fun_so_to_utf_32be(statep, s, l, o, osize);
+    }
+    return fun_so_to_utf_32be(statep, s, l, o, osize);
+}
+
 static const rb_transcoder
 rb_from_UTF_16BE = {
     "UTF-16BE", "UTF-8", from_UTF_16BE,
@@ -442,6 +503,18 @@ rb_from_UTF_16 = {
     NULL, fun_si_from_utf_16, NULL, fun_so_from_utf_16
 };
 
+static const rb_transcoder
+rb_from_UTF_32 = {
+    "UTF-32", "UTF-8", from_UTF_32,
+    TRANSCODE_TABLE_INFO,
+    4, /* input_unit_length */
+    4, /* max_input */
+    4, /* max_output */
+    asciicompat_decoder, /* asciicompat_type */
+    1, state_init, NULL, /* state_size, state_init, state_fini */
+    NULL, fun_si_from_utf_32, NULL, fun_so_from_utf_32
+};
+
 static const rb_transcoder
 rb_to_UTF_16 = {
     "UTF-8", "UTF-16", from_UTF_8,
@@ -454,6 +527,18 @@ rb_to_UTF_16 = {
     NULL, NULL, NULL, fun_so_to_utf_16
 };
 
+static const rb_transcoder
+rb_to_UTF_32 = {
+    "UTF-8", "UTF-32", 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_32
+};
+
 void
 Init_utf_16_32(void)
 {
@@ -467,4 +552,6 @@ Init_utf_16_32(void)
     rb_register_transcoder(&rb_to_UTF_32LE);
     rb_register_transcoder(&rb_from_UTF_16);
     rb_register_transcoder(&rb_to_UTF_16);
+    rb_register_transcoder(&rb_from_UTF_32);
+    rb_register_transcoder(&rb_to_UTF_32);
 }

test/ruby/test_transcode.rb

@@ -1027,6 +1027,13 @@ class TestTranscode < Test::Unit::TestCase
     assert_raise(Encoding::InvalidByteSequenceError){%w/fffeb7df/.pack("H*").encode("UTF-8","UTF-16")}
   end
 
+  def test_utf_32_bom
+    expected = "\u{3042}\u{3044}\u{20bb7}"
+    assert_equal(expected, %w/fffe00004230000044300000b70b0200/.pack("H*").encode("UTF-8","UTF-32"))
+    check_both_ways(expected, %w/0000feff000030420000304400020bb7/.pack("H*"), "UTF-32")
+    assert_raise(Encoding::InvalidByteSequenceError){%w/0000feff00110000/.pack("H*").encode("UTF-8","UTF-32")}
+  end
+
   def check_utf_32_both_ways(utf8, raw)
     copy = raw.dup
     0.step(copy.length-1, 4) do |i|