From 38b482be8c3b53809fa44e35cb0eded148b132c8 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 24 Nov 2010 00:08:04 +0000
Subject: * 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
---
 enc/trans/utf_16_32.trans | 87 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

(limited to 'enc')

diff --git a/enc/trans/utf_16_32.trans b/enc/trans/utf_16_32.trans
index 01caffe02c..c841df035f 100644
--- a/enc/trans/utf_16_32.trans
+++ b/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);
 }
-- 
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