/* $Id$
 * reactos filesystem name strings functions emulation of libcaptive
 * Copyright (C) 2002 Jan Kratochvil <project-captive@jankratochvil.net>
 * 
 * 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; exactly version 2 of June 1991 is required
 * 
 * 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
 */


#include "config.h"

#include "reactos/ddk/fsfuncs.h"	/* self */
#include <glib/gmessages.h>
#include "captive/unicode.h"


/**
 * FsRtlIsFatDbcsLegal:
 * @DbcsName_nonconst: #ANSI_STRING to check.
 * Yes, the string is passed by value, not by reference!
 * @WildCardsPermissible: Allow '*' or '?' characters?
 * @PathNamePermissible: Allow '\' for pathname checking? Otherwise plain filename is required.
 * @LeadingBackslashPermissible: Allow first directory component empty?
 *
 * Characters 0x00..0x1F, '"', '/', ':', '|', '+', ',', ';', '=', '[' and ']' are always forbidden anywhere.
 * Characters '*' and '?' are permitted if @WildCardsPermissible.
 * Basename length must be >=1 && <=8. Extension length must be >=0 && <=3.
 * Basename or extension must not contain trailing space (' ').
 * Only one '.' is allowed inside one filename component - to split filename to basename and extension.
 *
 * Returns: %TRUE if @DbcsName_nonconst is a valid pathname according to the constaints.
 */
BOOLEAN FsRtlIsFatDbcsLegal(IN ANSI_STRING DbcsName_nonconst,
		IN BOOLEAN WildCardsPermissible,IN BOOLEAN PathNamePermissible,IN BOOLEAN LeadingBackslashPermissible)
{
const ANSI_STRING *cDbcsName;
gboolean gotdot=FALSE;
gint len=0,i;

	g_return_val_if_fail(captive_validate_AnsiString(&DbcsName_nonconst),FALSE);
	g_return_val_if_fail(PathNamePermissible==FALSE,FALSE);	/* FIXME: 'PathNamePermissible' not yet implemented */

	cDbcsName=&DbcsName_nonconst;
	for (i=0;i<cDbcsName->Length;i++) {
char c=cDbcsName->Buffer[i];

		if ((c>=0x00 && c<=0x1F)
		    || c=='"' || c=='/' || c==':' || c=='|' || c=='+' 
		    || c==',' || c==';' || c=='=' || c=='[' || c==']')	/* always invalid */
			return FALSE;
		if (!PathNamePermissible && c=='\\')
			return FALSE;
		if (!LeadingBackslashPermissible && i==0 && c=='\\')
			return FALSE;
		if (!WildCardsPermissible && (c=='*' || c=='?'))
			return FALSE;

		if (c!='.') {
			len++;
			continue;
			}
		/* c=='.' */
		if (gotdot)
			return FALSE;
		gotdot=TRUE;
		if (len<1 || len>8)
			return FALSE;
		len=0;
		if (' '==cDbcsName->Buffer[i-1])
			return FALSE;
		}
	if (!cDbcsName->Length)
		return FALSE;
	if (' '==cDbcsName->Buffer[cDbcsName->Length-1])
		return FALSE;
	if (len>(!gotdot ? 8 : 3))
		return FALSE;

	return TRUE;
}