/*
* Author: Manoj Ampalam <manoj.ampalam@microsoft.com>
*
* Copyright(c) 2016 Microsoft Corp.
* All rights reserved
*
* UTF8 <--> UTF16 conversion routines
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met :
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and / or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <Windows.h>
#include "inc\utf.h"

wchar_t *
utf8_to_utf16(const char *utf8)
{
	int needed = 0;
	wchar_t* utf16 = NULL;
	if ((needed = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0)) == 0 ||
	    (utf16 = malloc(needed * sizeof(wchar_t))) == NULL ||
	    MultiByteToWideChar(CP_UTF8, 0, utf8, -1, utf16, needed) == 0)
		return NULL;

	return utf16;
}

char *
utf16_to_utf8(const wchar_t* utf16)
{
	int needed = 0;
	char* utf8 = NULL;
	if ((needed = WideCharToMultiByte(CP_UTF8, 0, utf16, -1, NULL, 0, NULL, NULL)) == 0 ||
	    (utf8 = malloc(needed)) == NULL ||
	    WideCharToMultiByte(CP_UTF8, 0, utf16, -1, utf8, needed, NULL, NULL) == 0)
		return NULL;
	
	return utf8;
}