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/* 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 */
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