1 files changed, 128 insertions, 0 deletions
diff --git a/wsutil/unicode-utils.c b/wsutil/unicode-utils.c
new file mode 100644
index 0000000000..dfa6eb32d5
--- /dev/null
+++ b/wsutil/unicode-utils.c
@@ -0,0 +1,128 @@
+/* unicode-utils.c
+ * Unicode utility routines
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 2006 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef _WIN32
+
+#include <glib.h>
+#include "unicode-utils.h"
+
+#include <windows.h>
+#include <tchar.h>
+#include <wchar.h>
+
+/** @file
+ * Unicode utilities (internal interface)
+ *
+ * We define UNICODE and _UNICODE under Windows.  This means that
+ * Windows SDK routines expect UTF-16 strings, in contrast to newer
+ * versions of Glib and GTK+ which expect UTF-8.  This module provides
+ * convenience routines for converting between UTF-8 and UTF-16.
+ */
+
+#define INITIAL_UTFBUF_SIZE 128
+
+/*
+ * XXX - Should we use g_utf8_to_utf16() and g_utf16_to_utf8()
+ * instead?  The goal of the functions below was to provide simple
+ * wrappers for UTF-8 <-> UTF-16 conversion without making the
+ * caller worry about freeing up memory afterward.
+ */
+
+/* Convert from UTF-8 to UTF-16. */
+wchar_t * utf_8to16(const char *utf8str) {
+  static wchar_t *utf16buf[3];
+  static int utf16buf_len[3];
+  static int idx;
+
+  if (utf8str == NULL)
+    return NULL;
+
+  idx = (idx + 1) % 3;
+
+  /*
+   * Allocate the buffer if it's not already allocated.
+   */
+  if (utf16buf[idx] == NULL) {
+    utf16buf_len[idx] = INITIAL_UTFBUF_SIZE;
+    utf16buf[idx] = g_malloc(utf16buf_len[idx] * sizeof(wchar_t));
+  }
+
+  while (MultiByteToWideChar(CP_UTF8, 0, utf8str,
+      -1, NULL, 0) >= utf16buf_len[idx]) {
+    /*
+     * Double the buffer's size if it's not big enough.
+     * The size of the buffer starts at 128, so doubling its size
+     * adds at least another 128 bytes, which is more than enough
+     * for one more character plus a terminating '\0'.
+     */
+    utf16buf_len[idx] *= 2;
+    utf16buf[idx] = g_realloc(utf16buf[idx], utf16buf_len[idx] * sizeof(wchar_t));
+  }
+
+  if (MultiByteToWideChar(CP_UTF8, 0, utf8str,
+      -1, utf16buf[idx], utf16buf_len[idx]) == 0)
+    return NULL;
+
+  return utf16buf[idx];
+}
+
+/* Convert from UTF-16 to UTF-8. */
+gchar * utf_16to8(const wchar_t *utf16str) {
+  static gchar *utf8buf[3];
+  static int utf8buf_len[3];
+  static int idx;
+
+  if (utf16str == NULL)
+    return NULL;
+
+  idx = (idx + 1) % 3;
+
+  /*
+   * Allocate the buffer if it's not already allocated.
+   */
+  if (utf8buf[idx] == NULL) {
+    utf8buf_len[idx] = INITIAL_UTFBUF_SIZE;
+    utf8buf[idx] = g_malloc(utf8buf_len[idx]);
+  }
+
+  while (WideCharToMultiByte(CP_UTF8, 0, utf16str, -1,
+      NULL, 0, NULL, NULL) >= utf8buf_len[idx]) {
+    /*
+     * Double the buffer's size if it's not big enough.
+     * The size of the buffer starts at 128, so doubling its size
+     * adds at least another 128 bytes, which is more than enough
+     * for one more character plus a terminating '\0'.
+     */
+    utf8buf_len[idx] *= 2;
+    utf8buf[idx] = g_realloc(utf8buf[idx], utf8buf_len[idx]);
+  }
+
+  if (WideCharToMultiByte(CP_UTF8, 0, utf16str, -1,
+      utf8buf[idx], utf8buf_len[idx], NULL, NULL) == 0)
+    return NULL;
+
+  return utf8buf[idx];
+}
+
+#endif	/* _WIN32 */