summaryrefslogtreecommitdiff
path: root/fs/fdos/fat.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/fdos/fat.c')
-rw-r--r--fs/fdos/fat.c122
1 files changed, 0 insertions, 122 deletions
diff --git a/fs/fdos/fat.c b/fs/fdos/fat.c
deleted file mode 100644
index 408fec7600..0000000000
--- a/fs/fdos/fat.c
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * (C) Copyright 2002
- * Stäubli Faverges - <www.staubli.com>
- * Pierre AUBERT p.aubert@staubli.com
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#include <common.h>
-#include <config.h>
-#include <malloc.h>
-
-#include "dos.h"
-#include "fdos.h"
-
-
-/*-----------------------------------------------------------------------------
- * fat_decode --
- *-----------------------------------------------------------------------------
- */
-unsigned int fat_decode (Fs_t *fs, unsigned int num)
-{
- unsigned int start = num * 3 / 2;
- unsigned char *address = fs -> fat_buf + start;
-
- if (num < 2 || start + 1 > (fs -> fat_len * SZ_STD_SECTOR))
- return 1;
-
- if (num & 1)
- return ((address [1] & 0xff) << 4) | ((address [0] & 0xf0 ) >> 4);
- else
- return ((address [1] & 0xf) << 8) | (address [0] & 0xff );
-}
-/*-----------------------------------------------------------------------------
- * check_fat --
- *-----------------------------------------------------------------------------
- */
-static int check_fat (Fs_t *fs)
-{
- int i, f;
-
- /* Cluster verification */
- for (i = 3 ; i < fs -> num_clus; i++){
- f = fat_decode (fs, i);
- if (f < FAT12_LAST && f > fs -> num_clus){
- /* Wrong cluster number detected */
- return (-1);
- }
- }
- return (0);
-}
-/*-----------------------------------------------------------------------------
- * read_one_fat --
- *-----------------------------------------------------------------------------
- */
-static int read_one_fat (BootSector_t *boot, Fs_t *fs, int nfat)
-{
- if (dev_read (fs -> fat_buf,
- (fs -> fat_start + nfat * fs -> fat_len),
- fs -> fat_len) < 0) {
- return (-1);
- }
-
- if (fs -> fat_buf [0] || fs -> fat_buf [1] || fs -> fat_buf [2]) {
- if ((fs -> fat_buf [0] != boot -> descr &&
- (fs -> fat_buf [0] != 0xf9 || boot -> descr != MEDIA_STD)) ||
- fs -> fat_buf [0] < MEDIA_STD){
- /* Unknown Media */
- return (-1);
- }
- if (fs -> fat_buf [1] != 0xff || fs -> fat_buf [2] != 0xff){
- /* FAT doesn't start with good values */
- return (-1);
- }
- }
-
- if (fs -> num_clus >= FAT12_MAX_NB) {
- /* Too much clusters */
- return (-1);
- }
-
- return check_fat (fs);
-}
-/*-----------------------------------------------------------------------------
- * read_fat --
- *-----------------------------------------------------------------------------
- */
-int read_fat (BootSector_t *boot, Fs_t *fs)
-{
- unsigned int buflen;
- int i;
-
- /* Allocate Fat Buffer */
- buflen = fs -> fat_len * SZ_STD_SECTOR;
- if (fs -> fat_buf) {
- free (fs -> fat_buf);
- }
-
- if ((fs -> fat_buf = malloc (buflen)) == NULL) {
- return (-1);
- }
-
- /* Try to read each Fat */
- for (i = 0; i< fs -> nb_fat; i++){
- if (read_one_fat (boot, fs, i) == 0) {
- /* Fat is OK */
- fs -> num_fat = i;
- break;
- }
- }
-
- if (i == fs -> nb_fat){
- return (-1);
- }
-
- if (fs -> fat_len > (((fs -> num_clus + 2) *
- (FAT_BITS / 4) -1 ) / 2 /
- SZ_STD_SECTOR + 1)) {
- return (-1);
- }
- return (0);
-}