mirror of
https://github.com/brain-hackers/u-boot-brain
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1034 lines
24 KiB
C
1034 lines
24 KiB
C
/*
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* fat.c
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*
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* R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
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*
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* 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
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* 2003-03-10 - kharris@nexus-tech.net - ported to uboot
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include <fat.h>
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#include <asm/byteorder.h>
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#include <part.h>
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#if defined(CONFIG_CMD_FAT)
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/*
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* Convert a string to lowercase.
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*/
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static void
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downcase(char *str)
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{
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while (*str != '\0') {
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TOLOWER(*str);
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str++;
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}
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}
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static block_dev_desc_t *cur_dev = NULL;
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static unsigned long part_offset = 0;
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static int cur_part = 1;
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#define DOS_PART_TBL_OFFSET 0x1be
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#define DOS_PART_MAGIC_OFFSET 0x1fe
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#define DOS_FS_TYPE_OFFSET 0x36
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int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr)
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{
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startblock += part_offset;
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if (cur_dev == NULL)
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return -1;
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if (cur_dev->block_read) {
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return cur_dev->block_read (cur_dev->dev
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, startblock, getsize, (unsigned long *)bufptr);
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}
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return -1;
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}
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int
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fat_register_device(block_dev_desc_t *dev_desc, int part_no)
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{
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unsigned char buffer[SECTOR_SIZE];
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disk_partition_t info;
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if (!dev_desc->block_read)
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return -1;
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cur_dev = dev_desc;
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/* check if we have a MBR (on floppies we have only a PBR) */
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if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) {
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printf ("** Can't read from device %d **\n", dev_desc->dev);
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return -1;
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}
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if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
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buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
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/* no signature found */
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return -1;
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}
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if(!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
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/* ok, we assume we are on a PBR only */
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cur_part = 1;
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part_offset=0;
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} else {
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#if (defined(CONFIG_CMD_IDE) || \
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defined(CONFIG_CMD_SCSI) || \
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defined(CONFIG_CMD_USB) || \
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(defined(CONFIG_MMC) && defined(CONFIG_LPC2292)) || \
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defined(CONFIG_SYSTEMACE) )
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/* First we assume, there is a MBR */
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if (!get_partition_info (dev_desc, part_no, &info)) {
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part_offset = info.start;
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cur_part = part_no;
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} else if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3)) {
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/* ok, we assume we are on a PBR only */
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cur_part = 1;
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part_offset = 0;
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} else {
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printf ("** Partition %d not valid on device %d **\n",
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part_no, dev_desc->dev);
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return -1;
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}
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#else
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if(!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
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/* ok, we assume we are on a PBR only */
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cur_part = 1;
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part_offset = 0;
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info.start = part_offset;
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} else {
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/* FIXME we need to determine the start block of the
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* partition where the DOS FS resides. This can be done
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* by using the get_partition_info routine. For this
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* purpose the libpart must be included.
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*/
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part_offset = 32;
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cur_part = 1;
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}
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#endif
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}
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return 0;
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}
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/*
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* Get the first occurence of a directory delimiter ('/' or '\') in a string.
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* Return index into string if found, -1 otherwise.
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*/
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static int
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dirdelim(char *str)
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{
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char *start = str;
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while (*str != '\0') {
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if (ISDIRDELIM(*str)) return str - start;
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str++;
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}
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return -1;
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}
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/*
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* Match volume_info fs_type strings.
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* Return 0 on match, -1 otherwise.
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*/
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static int
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compare_sign(char *str1, char *str2)
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{
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char *end = str1+SIGNLEN;
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while (str1 != end) {
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if (*str1 != *str2) {
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return -1;
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}
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str1++;
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str2++;
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}
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return 0;
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}
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/*
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* Extract zero terminated short name from a directory entry.
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*/
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static void get_name (dir_entry *dirent, char *s_name)
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{
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char *ptr;
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memcpy (s_name, dirent->name, 8);
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s_name[8] = '\0';
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ptr = s_name;
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while (*ptr && *ptr != ' ')
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ptr++;
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if (dirent->ext[0] && dirent->ext[0] != ' ') {
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*ptr = '.';
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ptr++;
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memcpy (ptr, dirent->ext, 3);
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ptr[3] = '\0';
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while (*ptr && *ptr != ' ')
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ptr++;
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}
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*ptr = '\0';
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if (*s_name == DELETED_FLAG)
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*s_name = '\0';
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else if (*s_name == aRING)
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*s_name = '<EFBFBD>';
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downcase (s_name);
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}
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/*
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* Get the entry at index 'entry' in a FAT (12/16/32) table.
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* On failure 0x00 is returned.
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*/
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static __u32
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get_fatent(fsdata *mydata, __u32 entry)
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{
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__u32 bufnum;
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__u32 offset;
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__u32 ret = 0x00;
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switch (mydata->fatsize) {
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case 32:
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bufnum = entry / FAT32BUFSIZE;
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offset = entry - bufnum * FAT32BUFSIZE;
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break;
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case 16:
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bufnum = entry / FAT16BUFSIZE;
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offset = entry - bufnum * FAT16BUFSIZE;
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break;
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case 12:
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bufnum = entry / FAT12BUFSIZE;
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offset = entry - bufnum * FAT12BUFSIZE;
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break;
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default:
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/* Unsupported FAT size */
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return ret;
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}
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/* Read a new block of FAT entries into the cache. */
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if (bufnum != mydata->fatbufnum) {
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int getsize = FATBUFSIZE/FS_BLOCK_SIZE;
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__u8 *bufptr = mydata->fatbuf;
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__u32 fatlength = mydata->fatlength;
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__u32 startblock = bufnum * FATBUFBLOCKS;
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fatlength *= SECTOR_SIZE; /* We want it in bytes now */
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startblock += mydata->fat_sect; /* Offset from start of disk */
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if (getsize > fatlength) getsize = fatlength;
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if (disk_read(startblock, getsize, bufptr) < 0) {
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FAT_DPRINT("Error reading FAT blocks\n");
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return ret;
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}
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mydata->fatbufnum = bufnum;
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}
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/* Get the actual entry from the table */
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switch (mydata->fatsize) {
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case 32:
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ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]);
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break;
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case 16:
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ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]);
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break;
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case 12: {
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__u32 off16 = (offset*3)/4;
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__u16 val1, val2;
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switch (offset & 0x3) {
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case 0:
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ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
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ret &= 0xfff;
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break;
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case 1:
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val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
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val1 &= 0xf000;
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val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
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val2 &= 0x00ff;
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ret = (val2 << 4) | (val1 >> 12);
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break;
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case 2:
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val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
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val1 &= 0xff00;
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val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
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val2 &= 0x000f;
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ret = (val2 << 8) | (val1 >> 8);
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break;
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case 3:
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ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);;
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ret = (ret & 0xfff0) >> 4;
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break;
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default:
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break;
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}
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}
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break;
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}
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FAT_DPRINT("ret: %d, offset: %d\n", ret, offset);
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return ret;
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}
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/*
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* Read at most 'size' bytes from the specified cluster into 'buffer'.
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* Return 0 on success, -1 otherwise.
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*/
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static int
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get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
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{
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int idx = 0;
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__u32 startsect;
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if (clustnum > 0) {
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startsect = mydata->data_begin + clustnum*mydata->clust_size;
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} else {
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startsect = mydata->rootdir_sect;
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}
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FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
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if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) {
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FAT_DPRINT("Error reading data\n");
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return -1;
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}
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if(size % FS_BLOCK_SIZE) {
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__u8 tmpbuf[FS_BLOCK_SIZE];
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idx= size/FS_BLOCK_SIZE;
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if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
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FAT_DPRINT("Error reading data\n");
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return -1;
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}
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buffer += idx*FS_BLOCK_SIZE;
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memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE);
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return 0;
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}
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return 0;
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}
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/*
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* Read at most 'maxsize' bytes from the file associated with 'dentptr'
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* into 'buffer'.
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* Return the number of bytes read or -1 on fatal errors.
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*/
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static long
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get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
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unsigned long maxsize)
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{
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unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
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unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE;
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__u32 curclust = START(dentptr);
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__u32 endclust, newclust;
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unsigned long actsize;
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FAT_DPRINT("Filesize: %ld bytes\n", filesize);
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if (maxsize > 0 && filesize > maxsize) filesize = maxsize;
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FAT_DPRINT("Reading: %ld bytes\n", filesize);
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actsize=bytesperclust;
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endclust=curclust;
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do {
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/* search for consecutive clusters */
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while(actsize < filesize) {
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newclust = get_fatent(mydata, endclust);
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if((newclust -1)!=endclust)
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goto getit;
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if (newclust <= 0x0001 || newclust >= 0xfff0) {
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FAT_DPRINT("curclust: 0x%x\n", newclust);
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FAT_DPRINT("Invalid FAT entry\n");
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return gotsize;
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}
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endclust=newclust;
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actsize+= bytesperclust;
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}
|
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/* actsize >= file size */
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actsize -= bytesperclust;
|
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/* get remaining clusters */
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if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
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FAT_ERROR("Error reading cluster\n");
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return -1;
|
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}
|
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/* get remaining bytes */
|
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gotsize += (int)actsize;
|
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filesize -= actsize;
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buffer += actsize;
|
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actsize= filesize;
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if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
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FAT_ERROR("Error reading cluster\n");
|
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return -1;
|
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}
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gotsize+=actsize;
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return gotsize;
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getit:
|
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if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
|
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FAT_ERROR("Error reading cluster\n");
|
||
return -1;
|
||
}
|
||
gotsize += (int)actsize;
|
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filesize -= actsize;
|
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buffer += actsize;
|
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curclust = get_fatent(mydata, endclust);
|
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if (curclust <= 0x0001 || curclust >= 0xfff0) {
|
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FAT_DPRINT("curclust: 0x%x\n", curclust);
|
||
FAT_ERROR("Invalid FAT entry\n");
|
||
return gotsize;
|
||
}
|
||
actsize=bytesperclust;
|
||
endclust=curclust;
|
||
} while (1);
|
||
}
|
||
|
||
|
||
#ifdef CONFIG_SUPPORT_VFAT
|
||
/*
|
||
* Extract the file name information from 'slotptr' into 'l_name',
|
||
* starting at l_name[*idx].
|
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* Return 1 if terminator (zero byte) is found, 0 otherwise.
|
||
*/
|
||
static int
|
||
slot2str(dir_slot *slotptr, char *l_name, int *idx)
|
||
{
|
||
int j;
|
||
|
||
for (j = 0; j <= 8; j += 2) {
|
||
l_name[*idx] = slotptr->name0_4[j];
|
||
if (l_name[*idx] == 0x00) return 1;
|
||
(*idx)++;
|
||
}
|
||
for (j = 0; j <= 10; j += 2) {
|
||
l_name[*idx] = slotptr->name5_10[j];
|
||
if (l_name[*idx] == 0x00) return 1;
|
||
(*idx)++;
|
||
}
|
||
for (j = 0; j <= 2; j += 2) {
|
||
l_name[*idx] = slotptr->name11_12[j];
|
||
if (l_name[*idx] == 0x00) return 1;
|
||
(*idx)++;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/*
|
||
* Extract the full long filename starting at 'retdent' (which is really
|
||
* a slot) into 'l_name'. If successful also copy the real directory entry
|
||
* into 'retdent'
|
||
* Return 0 on success, -1 otherwise.
|
||
*/
|
||
__u8 get_vfatname_block[MAX_CLUSTSIZE];
|
||
static int
|
||
get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
|
||
dir_entry *retdent, char *l_name)
|
||
{
|
||
dir_entry *realdent;
|
||
dir_slot *slotptr = (dir_slot*) retdent;
|
||
__u8 *nextclust = cluster + mydata->clust_size * SECTOR_SIZE;
|
||
__u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
|
||
int idx = 0;
|
||
|
||
while ((__u8*)slotptr < nextclust) {
|
||
if (counter == 0) break;
|
||
if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
|
||
return -1;
|
||
slotptr++;
|
||
counter--;
|
||
}
|
||
|
||
if ((__u8*)slotptr >= nextclust) {
|
||
dir_slot *slotptr2;
|
||
|
||
slotptr--;
|
||
curclust = get_fatent(mydata, curclust);
|
||
if (curclust <= 0x0001 || curclust >= 0xfff0) {
|
||
FAT_DPRINT("curclust: 0x%x\n", curclust);
|
||
FAT_ERROR("Invalid FAT entry\n");
|
||
return -1;
|
||
}
|
||
if (get_cluster(mydata, curclust, get_vfatname_block,
|
||
mydata->clust_size * SECTOR_SIZE) != 0) {
|
||
FAT_DPRINT("Error: reading directory block\n");
|
||
return -1;
|
||
}
|
||
slotptr2 = (dir_slot*) get_vfatname_block;
|
||
while (slotptr2->id > 0x01) {
|
||
slotptr2++;
|
||
}
|
||
/* Save the real directory entry */
|
||
realdent = (dir_entry*)slotptr2 + 1;
|
||
while ((__u8*)slotptr2 >= get_vfatname_block) {
|
||
slot2str(slotptr2, l_name, &idx);
|
||
slotptr2--;
|
||
}
|
||
} else {
|
||
/* Save the real directory entry */
|
||
realdent = (dir_entry*)slotptr;
|
||
}
|
||
|
||
do {
|
||
slotptr--;
|
||
if (slot2str(slotptr, l_name, &idx)) break;
|
||
} while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
|
||
|
||
l_name[idx] = '\0';
|
||
if (*l_name == DELETED_FLAG) *l_name = '\0';
|
||
else if (*l_name == aRING) *l_name = '<EFBFBD>';
|
||
downcase(l_name);
|
||
|
||
/* Return the real directory entry */
|
||
memcpy(retdent, realdent, sizeof(dir_entry));
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Calculate short name checksum */
|
||
static __u8
|
||
mkcksum(const char *str)
|
||
{
|
||
int i;
|
||
__u8 ret = 0;
|
||
|
||
for (i = 0; i < 11; i++) {
|
||
ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i];
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
#endif
|
||
|
||
|
||
/*
|
||
* Get the directory entry associated with 'filename' from the directory
|
||
* starting at 'startsect'
|
||
*/
|
||
__u8 get_dentfromdir_block[MAX_CLUSTSIZE];
|
||
static dir_entry *get_dentfromdir (fsdata * mydata, int startsect,
|
||
char *filename, dir_entry * retdent,
|
||
int dols)
|
||
{
|
||
__u16 prevcksum = 0xffff;
|
||
__u32 curclust = START (retdent);
|
||
int files = 0, dirs = 0;
|
||
|
||
FAT_DPRINT ("get_dentfromdir: %s\n", filename);
|
||
while (1) {
|
||
dir_entry *dentptr;
|
||
int i;
|
||
|
||
if (get_cluster (mydata, curclust, get_dentfromdir_block,
|
||
mydata->clust_size * SECTOR_SIZE) != 0) {
|
||
FAT_DPRINT ("Error: reading directory block\n");
|
||
return NULL;
|
||
}
|
||
dentptr = (dir_entry *) get_dentfromdir_block;
|
||
for (i = 0; i < DIRENTSPERCLUST; i++) {
|
||
char s_name[14], l_name[256];
|
||
|
||
l_name[0] = '\0';
|
||
if (dentptr->name[0] == DELETED_FLAG) {
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
if ((dentptr->attr & ATTR_VOLUME)) {
|
||
#ifdef CONFIG_SUPPORT_VFAT
|
||
if ((dentptr->attr & ATTR_VFAT) &&
|
||
(dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
|
||
prevcksum = ((dir_slot *) dentptr)
|
||
->alias_checksum;
|
||
get_vfatname (mydata, curclust, get_dentfromdir_block,
|
||
dentptr, l_name);
|
||
if (dols) {
|
||
int isdir = (dentptr->attr & ATTR_DIR);
|
||
char dirc;
|
||
int doit = 0;
|
||
|
||
if (isdir) {
|
||
dirs++;
|
||
dirc = '/';
|
||
doit = 1;
|
||
} else {
|
||
dirc = ' ';
|
||
if (l_name[0] != 0) {
|
||
files++;
|
||
doit = 1;
|
||
}
|
||
}
|
||
if (doit) {
|
||
if (dirc == ' ') {
|
||
printf (" %8ld %s%c\n",
|
||
(long) FAT2CPU32 (dentptr->size),
|
||
l_name, dirc);
|
||
} else {
|
||
printf (" %s%c\n", l_name, dirc);
|
||
}
|
||
}
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
FAT_DPRINT ("vfatname: |%s|\n", l_name);
|
||
} else
|
||
#endif
|
||
{
|
||
/* Volume label or VFAT entry */
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
}
|
||
if (dentptr->name[0] == 0) {
|
||
if (dols) {
|
||
printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
|
||
}
|
||
FAT_DPRINT ("Dentname == NULL - %d\n", i);
|
||
return NULL;
|
||
}
|
||
#ifdef CONFIG_SUPPORT_VFAT
|
||
if (dols && mkcksum (dentptr->name) == prevcksum) {
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
#endif
|
||
get_name (dentptr, s_name);
|
||
if (dols) {
|
||
int isdir = (dentptr->attr & ATTR_DIR);
|
||
char dirc;
|
||
int doit = 0;
|
||
|
||
if (isdir) {
|
||
dirs++;
|
||
dirc = '/';
|
||
doit = 1;
|
||
} else {
|
||
dirc = ' ';
|
||
if (s_name[0] != 0) {
|
||
files++;
|
||
doit = 1;
|
||
}
|
||
}
|
||
if (doit) {
|
||
if (dirc == ' ') {
|
||
printf (" %8ld %s%c\n",
|
||
(long) FAT2CPU32 (dentptr->size), s_name,
|
||
dirc);
|
||
} else {
|
||
printf (" %s%c\n", s_name, dirc);
|
||
}
|
||
}
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
if (strcmp (filename, s_name) && strcmp (filename, l_name)) {
|
||
FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name);
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
memcpy (retdent, dentptr, sizeof (dir_entry));
|
||
|
||
FAT_DPRINT ("DentName: %s", s_name);
|
||
FAT_DPRINT (", start: 0x%x", START (dentptr));
|
||
FAT_DPRINT (", size: 0x%x %s\n",
|
||
FAT2CPU32 (dentptr->size),
|
||
(dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
|
||
|
||
return retdent;
|
||
}
|
||
curclust = get_fatent (mydata, curclust);
|
||
if (curclust <= 0x0001 || curclust >= 0xfff0) {
|
||
FAT_DPRINT ("curclust: 0x%x\n", curclust);
|
||
FAT_ERROR ("Invalid FAT entry\n");
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/*
|
||
* Read boot sector and volume info from a FAT filesystem
|
||
*/
|
||
static int
|
||
read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
|
||
{
|
||
__u8 block[FS_BLOCK_SIZE];
|
||
volume_info *vistart;
|
||
|
||
if (disk_read(0, 1, block) < 0) {
|
||
FAT_DPRINT("Error: reading block\n");
|
||
return -1;
|
||
}
|
||
|
||
memcpy(bs, block, sizeof(boot_sector));
|
||
bs->reserved = FAT2CPU16(bs->reserved);
|
||
bs->fat_length = FAT2CPU16(bs->fat_length);
|
||
bs->secs_track = FAT2CPU16(bs->secs_track);
|
||
bs->heads = FAT2CPU16(bs->heads);
|
||
#if 0 /* UNUSED */
|
||
bs->hidden = FAT2CPU32(bs->hidden);
|
||
#endif
|
||
bs->total_sect = FAT2CPU32(bs->total_sect);
|
||
|
||
/* FAT32 entries */
|
||
if (bs->fat_length == 0) {
|
||
/* Assume FAT32 */
|
||
bs->fat32_length = FAT2CPU32(bs->fat32_length);
|
||
bs->flags = FAT2CPU16(bs->flags);
|
||
bs->root_cluster = FAT2CPU32(bs->root_cluster);
|
||
bs->info_sector = FAT2CPU16(bs->info_sector);
|
||
bs->backup_boot = FAT2CPU16(bs->backup_boot);
|
||
vistart = (volume_info*) (block + sizeof(boot_sector));
|
||
*fatsize = 32;
|
||
} else {
|
||
vistart = (volume_info*) &(bs->fat32_length);
|
||
*fatsize = 0;
|
||
}
|
||
memcpy(volinfo, vistart, sizeof(volume_info));
|
||
|
||
/* Terminate fs_type string. Writing past the end of vistart
|
||
is ok - it's just the buffer. */
|
||
vistart->fs_type[8] = '\0';
|
||
|
||
if (*fatsize == 32) {
|
||
if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) {
|
||
return 0;
|
||
}
|
||
} else {
|
||
if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) {
|
||
*fatsize = 12;
|
||
return 0;
|
||
}
|
||
if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) {
|
||
*fatsize = 16;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
FAT_DPRINT("Error: broken fs_type sign\n");
|
||
return -1;
|
||
}
|
||
|
||
|
||
__u8 do_fat_read_block[MAX_CLUSTSIZE]; /* Block buffer */
|
||
long
|
||
do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
|
||
int dols)
|
||
{
|
||
#if CONFIG_NIOS /* NIOS CPU cannot access big automatic arrays */
|
||
static
|
||
#endif
|
||
char fnamecopy[2048];
|
||
boot_sector bs;
|
||
volume_info volinfo;
|
||
fsdata datablock;
|
||
fsdata *mydata = &datablock;
|
||
dir_entry *dentptr;
|
||
__u16 prevcksum = 0xffff;
|
||
char *subname = "";
|
||
int rootdir_size, cursect;
|
||
int idx, isdir = 0;
|
||
int files = 0, dirs = 0;
|
||
long ret = 0;
|
||
int firsttime;
|
||
|
||
if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) {
|
||
FAT_DPRINT ("Error: reading boot sector\n");
|
||
return -1;
|
||
}
|
||
if (mydata->fatsize == 32) {
|
||
mydata->fatlength = bs.fat32_length;
|
||
} else {
|
||
mydata->fatlength = bs.fat_length;
|
||
}
|
||
mydata->fat_sect = bs.reserved;
|
||
cursect = mydata->rootdir_sect
|
||
= mydata->fat_sect + mydata->fatlength * bs.fats;
|
||
mydata->clust_size = bs.cluster_size;
|
||
if (mydata->fatsize == 32) {
|
||
rootdir_size = mydata->clust_size;
|
||
mydata->data_begin = mydata->rootdir_sect /* + rootdir_size */
|
||
- (mydata->clust_size * 2);
|
||
} else {
|
||
rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0])
|
||
* sizeof (dir_entry)) / SECTOR_SIZE;
|
||
mydata->data_begin = mydata->rootdir_sect + rootdir_size
|
||
- (mydata->clust_size * 2);
|
||
}
|
||
mydata->fatbufnum = -1;
|
||
|
||
FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize,
|
||
mydata->fatlength);
|
||
FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n"
|
||
"Data begins at: %d\n",
|
||
mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE,
|
||
rootdir_size, mydata->data_begin);
|
||
FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size);
|
||
|
||
/* "cwd" is always the root... */
|
||
while (ISDIRDELIM (*filename))
|
||
filename++;
|
||
/* Make a copy of the filename and convert it to lowercase */
|
||
strcpy (fnamecopy, filename);
|
||
downcase (fnamecopy);
|
||
if (*fnamecopy == '\0') {
|
||
if (!dols)
|
||
return -1;
|
||
dols = LS_ROOT;
|
||
} else if ((idx = dirdelim (fnamecopy)) >= 0) {
|
||
isdir = 1;
|
||
fnamecopy[idx] = '\0';
|
||
subname = fnamecopy + idx + 1;
|
||
/* Handle multiple delimiters */
|
||
while (ISDIRDELIM (*subname))
|
||
subname++;
|
||
} else if (dols) {
|
||
isdir = 1;
|
||
}
|
||
|
||
while (1) {
|
||
int i;
|
||
|
||
if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) {
|
||
FAT_DPRINT ("Error: reading rootdir block\n");
|
||
return -1;
|
||
}
|
||
dentptr = (dir_entry *) do_fat_read_block;
|
||
for (i = 0; i < DIRENTSPERBLOCK; i++) {
|
||
char s_name[14], l_name[256];
|
||
|
||
l_name[0] = '\0';
|
||
if ((dentptr->attr & ATTR_VOLUME)) {
|
||
#ifdef CONFIG_SUPPORT_VFAT
|
||
if ((dentptr->attr & ATTR_VFAT) &&
|
||
(dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
|
||
prevcksum = ((dir_slot *) dentptr)->alias_checksum;
|
||
get_vfatname (mydata, 0, do_fat_read_block, dentptr, l_name);
|
||
if (dols == LS_ROOT) {
|
||
int isdir = (dentptr->attr & ATTR_DIR);
|
||
char dirc;
|
||
int doit = 0;
|
||
|
||
if (isdir) {
|
||
dirs++;
|
||
dirc = '/';
|
||
doit = 1;
|
||
} else {
|
||
dirc = ' ';
|
||
if (l_name[0] != 0) {
|
||
files++;
|
||
doit = 1;
|
||
}
|
||
}
|
||
if (doit) {
|
||
if (dirc == ' ') {
|
||
printf (" %8ld %s%c\n",
|
||
(long) FAT2CPU32 (dentptr->size),
|
||
l_name, dirc);
|
||
} else {
|
||
printf (" %s%c\n", l_name, dirc);
|
||
}
|
||
}
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
FAT_DPRINT ("Rootvfatname: |%s|\n", l_name);
|
||
} else
|
||
#endif
|
||
{
|
||
/* Volume label or VFAT entry */
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
} else if (dentptr->name[0] == 0) {
|
||
FAT_DPRINT ("RootDentname == NULL - %d\n", i);
|
||
if (dols == LS_ROOT) {
|
||
printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
|
||
return 0;
|
||
}
|
||
return -1;
|
||
}
|
||
#ifdef CONFIG_SUPPORT_VFAT
|
||
else if (dols == LS_ROOT
|
||
&& mkcksum (dentptr->name) == prevcksum) {
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
#endif
|
||
get_name (dentptr, s_name);
|
||
if (dols == LS_ROOT) {
|
||
int isdir = (dentptr->attr & ATTR_DIR);
|
||
char dirc;
|
||
int doit = 0;
|
||
|
||
if (isdir) {
|
||
dirc = '/';
|
||
if (s_name[0] != 0) {
|
||
dirs++;
|
||
doit = 1;
|
||
}
|
||
} else {
|
||
dirc = ' ';
|
||
if (s_name[0] != 0) {
|
||
files++;
|
||
doit = 1;
|
||
}
|
||
}
|
||
if (doit) {
|
||
if (dirc == ' ') {
|
||
printf (" %8ld %s%c\n",
|
||
(long) FAT2CPU32 (dentptr->size), s_name,
|
||
dirc);
|
||
} else {
|
||
printf (" %s%c\n", s_name, dirc);
|
||
}
|
||
}
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) {
|
||
FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name);
|
||
dentptr++;
|
||
continue;
|
||
}
|
||
if (isdir && !(dentptr->attr & ATTR_DIR))
|
||
return -1;
|
||
|
||
FAT_DPRINT ("RootName: %s", s_name);
|
||
FAT_DPRINT (", start: 0x%x", START (dentptr));
|
||
FAT_DPRINT (", size: 0x%x %s\n",
|
||
FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : "");
|
||
|
||
goto rootdir_done; /* We got a match */
|
||
}
|
||
cursect++;
|
||
}
|
||
rootdir_done:
|
||
|
||
firsttime = 1;
|
||
while (isdir) {
|
||
int startsect = mydata->data_begin
|
||
+ START (dentptr) * mydata->clust_size;
|
||
dir_entry dent;
|
||
char *nextname = NULL;
|
||
|
||
dent = *dentptr;
|
||
dentptr = &dent;
|
||
|
||
idx = dirdelim (subname);
|
||
if (idx >= 0) {
|
||
subname[idx] = '\0';
|
||
nextname = subname + idx + 1;
|
||
/* Handle multiple delimiters */
|
||
while (ISDIRDELIM (*nextname))
|
||
nextname++;
|
||
if (dols && *nextname == '\0')
|
||
firsttime = 0;
|
||
} else {
|
||
if (dols && firsttime) {
|
||
firsttime = 0;
|
||
} else {
|
||
isdir = 0;
|
||
}
|
||
}
|
||
|
||
if (get_dentfromdir (mydata, startsect, subname, dentptr,
|
||
isdir ? 0 : dols) == NULL) {
|
||
if (dols && !isdir)
|
||
return 0;
|
||
return -1;
|
||
}
|
||
|
||
if (idx >= 0) {
|
||
if (!(dentptr->attr & ATTR_DIR))
|
||
return -1;
|
||
subname = nextname;
|
||
}
|
||
}
|
||
ret = get_contents (mydata, dentptr, buffer, maxsize);
|
||
FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret);
|
||
|
||
return ret;
|
||
}
|
||
|
||
|
||
int
|
||
file_fat_detectfs(void)
|
||
{
|
||
boot_sector bs;
|
||
volume_info volinfo;
|
||
int fatsize;
|
||
char vol_label[12];
|
||
|
||
if(cur_dev==NULL) {
|
||
printf("No current device\n");
|
||
return 1;
|
||
}
|
||
#if defined(CONFIG_CMD_IDE) || \
|
||
defined(CONFIG_CMD_SCSI) || \
|
||
defined(CONFIG_CMD_USB) || \
|
||
(CONFIG_MMC)
|
||
printf("Interface: ");
|
||
switch(cur_dev->if_type) {
|
||
case IF_TYPE_IDE : printf("IDE"); break;
|
||
case IF_TYPE_SCSI : printf("SCSI"); break;
|
||
case IF_TYPE_ATAPI : printf("ATAPI"); break;
|
||
case IF_TYPE_USB : printf("USB"); break;
|
||
case IF_TYPE_DOC : printf("DOC"); break;
|
||
case IF_TYPE_MMC : printf("MMC"); break;
|
||
default : printf("Unknown");
|
||
}
|
||
printf("\n Device %d: ",cur_dev->dev);
|
||
dev_print(cur_dev);
|
||
#endif
|
||
if(read_bootsectandvi(&bs, &volinfo, &fatsize)) {
|
||
printf("\nNo valid FAT fs found\n");
|
||
return 1;
|
||
}
|
||
memcpy (vol_label, volinfo.volume_label, 11);
|
||
vol_label[11] = '\0';
|
||
volinfo.fs_type[5]='\0';
|
||
printf("Partition %d: Filesystem: %s \"%s\"\n"
|
||
,cur_part,volinfo.fs_type,vol_label);
|
||
return 0;
|
||
}
|
||
|
||
|
||
int
|
||
file_fat_ls(const char *dir)
|
||
{
|
||
return do_fat_read(dir, NULL, 0, LS_YES);
|
||
}
|
||
|
||
|
||
long
|
||
file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
|
||
{
|
||
printf("reading %s\n",filename);
|
||
return do_fat_read(filename, buffer, maxsize, LS_NO);
|
||
}
|
||
|
||
#endif
|