/* * (C) Copyright 2004 *  esd gmbh <www.esd-electronics.com> *  Reinhard Arlt <reinhard.arlt@esd-electronics.com> * *  based on code of fs/reiserfs/dev.c by * *  (C) Copyright 2003 - 2004 *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com> * *  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. */#include <common.h>#if (CONFIG_COMMANDS & CFG_CMD_EXT2)#include <config.h>#include <ext2fs.h>static block_dev_desc_t *ext2fs_block_dev_desc;static disk_partition_t part_info;#undef DEBUGint ext2fs_set_blk_dev (block_dev_desc_t * rbdd, int part){	ext2fs_block_dev_desc = rbdd;	if (part == 0) {		/* disk doesn't use partition table */		part_info.start = 0;		part_info.size = rbdd->lba;		part_info.blksz = rbdd->blksz;	} else {		if (get_partition_info		    (ext2fs_block_dev_desc, part, &part_info)) {			return 0;		}	}	return (part_info.size);}int ext2fs_devread (int sector, int byte_offset, int byte_len, char *buf) {	char sec_buf[SECTOR_SIZE];	unsigned block_len;/* *  Check partition boundaries */	if ((sector < 0)	    || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=		part_info.size)) {	/*      errnum = ERR_OUTSIDE_PART; */		printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);		return (0);	}/* *  Get the read to the beginning of a partition. */	sector += byte_offset >> SECTOR_BITS;	byte_offset &= SECTOR_SIZE - 1;#if defined(DEBUG)	printf (" <%d, %d, %d>\n", sector, byte_offset, byte_len);#endif	if (ext2fs_block_dev_desc == NULL) {		printf ("** Invalid Block Device Descriptor (NULL)\n");		return (0);	}	if (byte_offset != 0) {		/* read first part which isn't aligned with start of sector */		if (ext2fs_block_dev_desc->		    block_read (ext2fs_block_dev_desc->dev,				part_info.start + sector, 1,				(unsigned long *) sec_buf) != 1) {			printf (" ** ext2fs_devread() read error **\n");			return (0);		}		memcpy (buf, sec_buf + byte_offset,			min (SECTOR_SIZE - byte_offset, byte_len));		buf += min (SECTOR_SIZE - byte_offset, byte_len);		byte_len -= min (SECTOR_SIZE - byte_offset, byte_len);		sector++;	}	/*  read sector aligned part */	block_len = byte_len & ~(SECTOR_SIZE - 1);	if (ext2fs_block_dev_desc->block_read (ext2fs_block_dev_desc->dev,					       part_info.start + sector,					       block_len / SECTOR_SIZE,					       (unsigned long *) buf) !=	    block_len / SECTOR_SIZE) {		printf (" ** ext2fs_devread() read error - block\n");		return (0);	}	buf += block_len;	byte_len -= block_len;	sector += block_len / SECTOR_SIZE;	if (byte_len != 0) {		/* read rest of data which are not in whole sector */		if (ext2fs_block_dev_desc->		    block_read (ext2fs_block_dev_desc->dev,				part_info.start + sector, 1,				(unsigned long *) sec_buf) != 1) {			printf (" ** ext2fs_devread() read error - last part\n");			return (0);		}		memcpy (buf, sec_buf, byte_len);	}	return (1);}#endif /* CFG_CMD_EXT2FS */