/* vi:set tabstop=2 cindent shiftwidth=2: */
/*
 * libvxfs - library for reading Veritas Journaled FileSystem (VxFS)
 * Copyright (c) 1999 Martin Hinner <mhi@penguin.cz>
 *
 * iread.c: VxFS inode block read routines
 *
 * 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.
 *
 * $Id$
 */
#include <stdio.h>
#include <stdlib.h>

#include <libvxfs.h>

void *
vxiread (struct vxfs_inode *ino, int blknum, int count)
{
	void *blk, *rblk;
	int blkno;
	int i;

	if (count == 0)
		return 0;

	blk = malloc (vxbsize * count);
	if (!blk)
		{
			if (vxverbose)
				fprintf (stderr, "vxiread(%u): Not enough memory!\n", blknum);
			return 0;
		}
	
	/* Process IMMED data */
	if (ino->orgtype == VXFS_ORG_IMMED)
		{
			if (blknum != 0 || count != 1)
				{
					free (blk);
					return 0;
				}
			memcpy (blk, ino->org.immed, VXFS_NIMMED);
			return blk;
		}

	for (i = 0; i < count; i++)
		{
			switch (ino->orgtype) {
				case VXFS_ORG_EXT4:
					blkno = vxbmap_ext4 (ino, blknum + i);
					break;
				case VXFS_ORG_TYPED:
					blkno = vxbmap_typed (ino, blknum + i);
					break;
			}
			if (blkno == -1)
				{
					if (vxverbose)
						printf ("vxiread: bxbmap returned -1\n");
					free (blk);
					return 0;
				}
			rblk = vxread (blkno, 1);
			if (rblk == 0)
				{
					if (vxverbose)
						printf ("vxiread: vxread() failed\n");
					free (blk);
					return 0;
				}
			memcpy ((char *) blk + (i * vxbsize), rblk, vxbsize);
			free (rblk);
		}
	return blk;
}