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/* TIFFS (TI Flash File System) reader implementation */
/*
* (C) 2017 by Mychaela Falconia <mychaela.falconia@gmail.com>
* Tweaked (coding style changes) by Vadim Yanitskiy <axilirator@gmail.com>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <inttypes.h>
#include <tiffs.h>
#include "globals.h"
/* Each flash sector used for TIFFS begins with this 6-byte signature */
static const uint8_t ffs_sector_signature[6] = {
'F', 'f', 's', '#', 0x10, 0x02
};
static int find_indexblk(void)
{
uint32_t sector_addr;
uint8_t *sector_ptr;
unsigned i;
sector_addr = tiffs_base_addr;
for (i = 0; i < tiffs_nsectors; i++) {
sector_ptr = (uint8_t *) sector_addr;
if (!memcmp(sector_ptr, ffs_sector_signature, 6)
&& sector_ptr[8] == 0xAB) {
printf("Found TIFFS active index block "
"at 0x%" PRIx32 "\n", sector_addr);
tiffs_active_index = (struct tiffs_inode *) sector_addr;
return 0;
}
sector_addr += tiffs_sector_size;
}
puts("TIFFS error: no active index block found\n");
return -1;
}
static int find_rootino(void)
{
struct tiffs_inode *irec;
unsigned ino = 0;
while (++ino < tiffs_sector_size >> 4) {
irec = tiffs_active_index + ino;
if (irec->type != TIFFS_OBJTYPE_DIR)
continue;
if (*INODE_TO_DATAPTR(irec) != '/')
continue;
printf("Found TIFFS root inode at #%x\n", ino);
tiffs_root_ino = ino;
return 0;
}
puts("TIFFS error: no root inode found\n");
return -1;
}
int tiffs_init(uint32_t base_addr, uint32_t sector_size, unsigned nsectors)
{
int rc;
printf("Looking for TIFFS (TI Flash File System) header at "
"0x%" PRIx32 ", %u sectors of 0x%" PRIx32 " bytes\n",
base_addr, nsectors, sector_size);
tiffs_base_addr = base_addr;
tiffs_sector_size = sector_size;
tiffs_nsectors = nsectors;
rc = find_indexblk();
if (rc < 0)
return rc;
rc = find_rootino();
if (rc < 0)
return rc;
tiffs_init_done = 1;
return 0;
}
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