mirror of
git://projects.qi-hardware.com/xburst-tools.git
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134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code of fs/reiserfs/dev.c by
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*
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* (C) Copyright 2003 - 2004
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* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <qi.h>
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#include <ext2.h>
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#include <string.h>
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extern unsigned long partition_offset_blocks;
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extern unsigned long partition_length_blocks;
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int ext2fs_devread(int sector, int filesystem_block_log2, int byte_offset, int byte_len, u8 *buf)
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{
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unsigned char sec_buf[SECTOR_SIZE];
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unsigned block_len;
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sector = sector << filesystem_block_log2;
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/*
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* Check partition boundaries
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*/
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if ((sector < 0)
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|| ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
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partition_length_blocks)) {
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/* errnum = ERR_OUTSIDE_PART; */
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puts(" ** ext2fs_devread() read outside partition sector ");
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printdec(sector);
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puts("\n");
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return 0;
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}
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if (this_board->get_ui_keys)
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if ((this_board->get_ui_keys)() & UI_ACTION_SKIPKERNEL) {
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puts(" ** skipping \n");
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return 0;
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}
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/*
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* Get the read to the beginning of a partition.
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*/
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sector += byte_offset >> SECTOR_BITS;
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byte_offset &= SECTOR_SIZE - 1;
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if (byte_offset) {
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int minimum = SECTOR_SIZE - byte_offset;
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if (byte_len < minimum)
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minimum = byte_len;
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/* read first part which isn't aligned with start of sector */
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if ((this_kernel->block_read)(sec_buf,
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partition_offset_blocks + sector, 1) < 0) {
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puts(" ** ext2fs_devread() read error **\n");
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return 0;
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}
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memcpy(buf, sec_buf + byte_offset,
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minimum);
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buf += minimum;
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byte_len -= minimum;
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sector++;
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}
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if (!byte_len)
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return 1;
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/* read sector aligned part */
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block_len = byte_len & ~(SECTOR_SIZE - 1);
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if (block_len == 0) {
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u8 p[SECTOR_SIZE];
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block_len = SECTOR_SIZE;
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this_kernel->block_read(p,
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partition_offset_blocks + sector, 1);
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memcpy(buf, p, byte_len);
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return 1;
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}
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if (this_kernel->block_read(buf, partition_offset_blocks + sector,
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block_len / SECTOR_SIZE) < 0) {
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puts(" ** ext2fs_devread() read error - block\n");
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printdec(partition_offset_blocks + sector);
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puts(" ");
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print32(block_len);
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puts(" ");
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print32(sector);
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return 0;
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}
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block_len = byte_len & ~(SECTOR_SIZE - 1);
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buf += block_len;
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byte_len -= block_len;
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sector += block_len / SECTOR_SIZE;
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if (byte_len) {
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/* read rest of data which are not in whole sector */
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if (this_kernel->block_read(sec_buf,
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partition_offset_blocks + sector, 1) != 1) {
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puts(" ** ext2fs_devread() read error - last part\n");
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printdec(partition_offset_blocks + sector);
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puts(" ");
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print32(block_len);
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puts(" ");
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print32(sector);
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return 0;
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}
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memcpy (buf, sec_buf, byte_len);
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}
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return 1;
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}
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