gecko-dev/lib/libi18n/detectu2.c
1998-03-28 02:44:41 +00:00

50 lines
1.4 KiB
C

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/* detectu2.c */
#include "intlpriv.h"
#include "xp.h"
#include "libi18n.h"
/*
This function returns csid if it finds that the data is UCS-2 or
UCS-2 needs swap.
*/
#define UCS2_GIVEUP_COUNT 512 /* Test at most 512 byte */
#define UCS2_00_TRIGGER 8 /* Need at least 4 0x00 to make our sample meanful */
#define UCS2_DETECT_DIFF 4
MODULE_PRIVATE int DetectUCS2(CCCDataObject obj, unsigned char *pSrc, int len)
{
/* need to fix DetectUCS2 to look for UTF8 */
if(len < 2) return(CS_DEFAULT);
if(((pSrc[0]<<8) | pSrc[1]) == BYTE_ORDER_MARK)
return(CS_UCS2);
if(((pSrc[0]<<8) | pSrc[1]) == NEEDS_SWAP_MARK)
return(CS_UCS2_SWAP);
return(CS_DEFAULT);
}