//
// $Header: D:/ext2-os2/ext2/RCS/bitmap.c,v 1.4 1995/08/08 21:16:35 Willm Exp Willm $
//

// Linux ext2 file system driver for OS/2 2.x and WARP - Allows OS/2 to     
// access your Linux ext2fs partitions as normal drive letters.
// OS/2 implementation : Copyright (C) 1995  Matthieu WILLM
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.



/*
 *  linux/fs/ext2/bitmap.c
 *
 *  Copyright (C) 1992, 1993, 1994  Remy Card (card@masi.ibp.fr)
 *                                  Laboratoire MASI - Institut Blaise Pascal
 *                                  Universite Pierre et Marie Curie (Paris VI)
 */
#ifdef OS2
#define INCL_DOS
#define INCL_DOSERRORS
#include <os2.h>		// From the "Developer Connection Device Driver Kit" version 2.0

#include <fsh.h>
#include <os2/types.h>
#endif

#include <linux/fs.h>
#ifndef OS2
#include <linux/ext2_fs.h>
#else
#include <linux/e2_fs.h>
#endif

static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};

#ifdef OS2
unsigned long ext2_count_free (struct buffer_head * map, unsigned long numchars)
#else
unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
#endif
{
	unsigned long i;
	unsigned long sum = 0;
	
	if (!map) 
		return (0);
	for (i = 0; i < numchars; i++)
		sum += nibblemap[map->b_data[i] & 0xf] +
			nibblemap[(map->b_data[i] >> 4) & 0xf];
	return (sum);
}