mirror of
https://github.com/AsahiLinux/u-boot
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1091 lines
25 KiB
C
1091 lines
25 KiB
C
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/*
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* fat_write.c
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*
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* R/W (V)FAT 12/16/32 filesystem implementation by Donggeun Kim
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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 <command.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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#include "fat.c"
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static void uppercase(char *str, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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TOUPPER(*str);
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str++;
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}
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}
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static int total_sector;
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static int disk_write(__u32 startblock, __u32 getsize, __u8 *bufptr)
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{
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if (cur_dev == NULL)
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return -1;
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if (startblock + getsize > total_sector) {
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printf("error: overflow occurs\n");
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return -1;
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}
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startblock += part_offset;
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if (cur_dev->block_read) {
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return cur_dev->block_write(cur_dev->dev, startblock, getsize,
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(unsigned long *) bufptr);
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}
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return -1;
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}
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/*
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* Set short name in directory entry
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*/
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static void set_name(dir_entry *dirent, const char *filename)
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{
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char s_name[VFAT_MAXLEN_BYTES];
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char *period;
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int period_location, len, i, ext_num;
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if (filename == NULL)
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return;
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len = strlen(filename);
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if (len == 0)
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return;
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memcpy(s_name, filename, len);
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uppercase(s_name, len);
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period = strchr(s_name, '.');
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if (period == NULL) {
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period_location = len;
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ext_num = 0;
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} else {
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period_location = period - s_name;
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ext_num = len - period_location - 1;
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}
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/* Pad spaces when the length of file name is shorter than eight */
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if (period_location < 8) {
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memcpy(dirent->name, s_name, period_location);
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for (i = period_location; i < 8; i++)
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dirent->name[i] = ' ';
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} else if (period_location == 8) {
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memcpy(dirent->name, s_name, period_location);
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} else {
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memcpy(dirent->name, s_name, 6);
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dirent->name[6] = '~';
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dirent->name[7] = '1';
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}
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if (ext_num < 3) {
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memcpy(dirent->ext, s_name + period_location + 1, ext_num);
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for (i = ext_num; i < 3; i++)
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dirent->ext[i] = ' ';
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} else
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memcpy(dirent->ext, s_name + period_location + 1, 3);
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debug("name : %s\n", dirent->name);
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debug("ext : %s\n", dirent->ext);
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}
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/*
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* Write fat buffer into block device
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*/
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static int flush_fat_buffer(fsdata *mydata)
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{
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int getsize = FATBUFBLOCKS;
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__u32 fatlength = mydata->fatlength;
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__u8 *bufptr = mydata->fatbuf;
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__u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
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fatlength *= mydata->sect_size;
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startblock += mydata->fat_sect;
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if (getsize > fatlength)
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getsize = fatlength;
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/* Write FAT buf */
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if (disk_write(startblock, getsize, bufptr) < 0) {
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debug("error: writing FAT blocks\n");
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return -1;
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}
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return 0;
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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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* When bufnum is changed, write back the previous fatbuf to the disk.
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*/
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static __u32 get_fatent_value(fsdata *mydata, __u32 entry)
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{
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__u32 bufnum;
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__u32 off16, offset;
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__u32 ret = 0x00;
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__u16 val1, val2;
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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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debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
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mydata->fatsize, entry, entry, offset, offset);
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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 = FATBUFBLOCKS;
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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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if (getsize > fatlength)
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getsize = fatlength;
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fatlength *= mydata->sect_size; /* We want it in bytes now */
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startblock += mydata->fat_sect; /* Offset from start of disk */
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/* Write back the fatbuf to the disk */
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if (mydata->fatbufnum != -1) {
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if (flush_fat_buffer(mydata) < 0)
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return -1;
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}
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if (disk_read(startblock, getsize, bufptr) < 0) {
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debug("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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off16 = (offset * 3) / 4;
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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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break;
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}
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debug("FAT%d: ret: %08x, entry: %08x, offset: %04x\n",
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mydata->fatsize, ret, entry, offset);
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return ret;
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}
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#ifdef CONFIG_SUPPORT_VFAT
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/*
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* Set the file name information from 'name' into 'slotptr',
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*/
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static int str2slot(dir_slot *slotptr, const char *name, int *idx)
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{
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int j, end_idx = 0;
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for (j = 0; j <= 8; j += 2) {
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if (name[*idx] == 0x00) {
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slotptr->name0_4[j] = 0;
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slotptr->name0_4[j + 1] = 0;
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end_idx++;
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goto name0_4;
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}
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slotptr->name0_4[j] = name[*idx];
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(*idx)++;
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end_idx++;
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}
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for (j = 0; j <= 10; j += 2) {
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if (name[*idx] == 0x00) {
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slotptr->name5_10[j] = 0;
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slotptr->name5_10[j + 1] = 0;
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end_idx++;
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goto name5_10;
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}
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slotptr->name5_10[j] = name[*idx];
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(*idx)++;
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end_idx++;
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}
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for (j = 0; j <= 2; j += 2) {
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if (name[*idx] == 0x00) {
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slotptr->name11_12[j] = 0;
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slotptr->name11_12[j + 1] = 0;
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end_idx++;
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goto name11_12;
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}
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slotptr->name11_12[j] = name[*idx];
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(*idx)++;
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end_idx++;
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}
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if (name[*idx] == 0x00)
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return 1;
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return 0;
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/* Not used characters are filled with 0xff 0xff */
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name0_4:
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for (; end_idx < 5; end_idx++) {
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slotptr->name0_4[end_idx * 2] = 0xff;
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slotptr->name0_4[end_idx * 2 + 1] = 0xff;
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}
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end_idx = 5;
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name5_10:
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end_idx -= 5;
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for (; end_idx < 6; end_idx++) {
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slotptr->name5_10[end_idx * 2] = 0xff;
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slotptr->name5_10[end_idx * 2 + 1] = 0xff;
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}
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end_idx = 11;
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name11_12:
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end_idx -= 11;
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for (; end_idx < 2; end_idx++) {
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slotptr->name11_12[end_idx * 2] = 0xff;
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slotptr->name11_12[end_idx * 2 + 1] = 0xff;
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}
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|
|
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return 1;
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}
|
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|
|
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static int is_next_clust(fsdata *mydata, dir_entry *dentptr);
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static void flush_dir_table(fsdata *mydata, dir_entry **dentptr);
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|
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/*
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* Fill dir_slot entries with appropriate name, id, and attr
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* The real directory entry is returned by 'dentptr'
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|
*/
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static void
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fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
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{
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|
dir_slot *slotptr = (dir_slot *)get_vfatname_block;
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|
__u8 counter, checksum;
|
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int idx = 0, ret;
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char s_name[16];
|
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|
|
||
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/* Get short file name and checksum value */
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strncpy(s_name, (*dentptr)->name, 16);
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|
checksum = mkcksum(s_name);
|
||
|
|
||
|
do {
|
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|
memset(slotptr, 0x00, sizeof(dir_slot));
|
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|
ret = str2slot(slotptr, l_name, &idx);
|
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|
slotptr->id = ++counter;
|
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|
slotptr->attr = ATTR_VFAT;
|
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|
slotptr->alias_checksum = checksum;
|
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|
slotptr++;
|
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|
} while (ret == 0);
|
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|
|
||
|
slotptr--;
|
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|
slotptr->id |= LAST_LONG_ENTRY_MASK;
|
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|
|
||
|
while (counter >= 1) {
|
||
|
if (is_next_clust(mydata, *dentptr)) {
|
||
|
/* A new cluster is allocated for directory table */
|
||
|
flush_dir_table(mydata, dentptr);
|
||
|
}
|
||
|
memcpy(*dentptr, slotptr, sizeof(dir_slot));
|
||
|
(*dentptr)++;
|
||
|
slotptr--;
|
||
|
counter--;
|
||
|
}
|
||
|
|
||
|
if (is_next_clust(mydata, *dentptr)) {
|
||
|
/* A new cluster is allocated for directory table */
|
||
|
flush_dir_table(mydata, dentptr);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static __u32 dir_curclust;
|
||
|
|
||
|
/*
|
||
|
* 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'
|
||
|
* If additional adjacent cluster for directory entries is read into memory,
|
||
|
* then 'get_vfatname_block' is copied into 'get_dentfromdir_block' and
|
||
|
* the location of the real directory entry is returned by 'retdent'
|
||
|
* Return 0 on success, -1 otherwise.
|
||
|
*/
|
||
|
static int
|
||
|
get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
|
||
|
dir_entry **retdent, char *l_name)
|
||
|
{
|
||
|
dir_entry *realdent;
|
||
|
dir_slot *slotptr = (dir_slot *)(*retdent);
|
||
|
dir_slot *slotptr2 = NULL;
|
||
|
__u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
|
||
|
PREFETCH_BLOCKS :
|
||
|
mydata->clust_size);
|
||
|
__u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
|
||
|
int idx = 0, cur_position = 0;
|
||
|
|
||
|
if (counter > VFAT_MAXSEQ) {
|
||
|
debug("Error: VFAT name is too long\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
while ((__u8 *)slotptr < buflimit) {
|
||
|
if (counter == 0)
|
||
|
break;
|
||
|
if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
|
||
|
return -1;
|
||
|
slotptr++;
|
||
|
counter--;
|
||
|
}
|
||
|
|
||
|
if ((__u8 *)slotptr >= buflimit) {
|
||
|
if (curclust == 0)
|
||
|
return -1;
|
||
|
curclust = get_fatent_value(mydata, dir_curclust);
|
||
|
if (CHECK_CLUST(curclust, mydata->fatsize)) {
|
||
|
debug("curclust: 0x%x\n", curclust);
|
||
|
printf("Invalid FAT entry\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
dir_curclust = curclust;
|
||
|
|
||
|
if (get_cluster(mydata, curclust, get_vfatname_block,
|
||
|
mydata->clust_size * mydata->sect_size) != 0) {
|
||
|
debug("Error: reading directory block\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
slotptr2 = (dir_slot *)get_vfatname_block;
|
||
|
while (counter > 0) {
|
||
|
if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
|
||
|
& 0xff) != counter)
|
||
|
return -1;
|
||
|
slotptr2++;
|
||
|
counter--;
|
||
|
}
|
||
|
|
||
|
/* Save the real directory entry */
|
||
|
realdent = (dir_entry *)slotptr2;
|
||
|
while ((__u8 *)slotptr2 > get_vfatname_block) {
|
||
|
slotptr2--;
|
||
|
slot2str(slotptr2, l_name, &idx);
|
||
|
}
|
||
|
} 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 = DELETED_FLAG;
|
||
|
downcase(l_name);
|
||
|
|
||
|
/* Return the real directory entry */
|
||
|
*retdent = realdent;
|
||
|
|
||
|
if (slotptr2) {
|
||
|
memcpy(get_dentfromdir_block, get_vfatname_block,
|
||
|
mydata->clust_size * mydata->sect_size);
|
||
|
cur_position = (__u8 *)realdent - get_vfatname_block;
|
||
|
*retdent = (dir_entry *) &get_dentfromdir_block[cur_position];
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#endif
|
||
|
|
||
|
/*
|
||
|
* Set the entry at index 'entry' in a FAT (16/32) table.
|
||
|
*/
|
||
|
static int set_fatent_value(fsdata *mydata, __u32 entry, __u32 entry_value)
|
||
|
{
|
||
|
__u32 bufnum, offset;
|
||
|
|
||
|
switch (mydata->fatsize) {
|
||
|
case 32:
|
||
|
bufnum = entry / FAT32BUFSIZE;
|
||
|
offset = entry - bufnum * FAT32BUFSIZE;
|
||
|
break;
|
||
|
case 16:
|
||
|
bufnum = entry / FAT16BUFSIZE;
|
||
|
offset = entry - bufnum * FAT16BUFSIZE;
|
||
|
break;
|
||
|
default:
|
||
|
/* Unsupported FAT size */
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/* Read a new block of FAT entries into the cache. */
|
||
|
if (bufnum != mydata->fatbufnum) {
|
||
|
int getsize = FATBUFBLOCKS;
|
||
|
__u8 *bufptr = mydata->fatbuf;
|
||
|
__u32 fatlength = mydata->fatlength;
|
||
|
__u32 startblock = bufnum * FATBUFBLOCKS;
|
||
|
|
||
|
fatlength *= mydata->sect_size;
|
||
|
startblock += mydata->fat_sect;
|
||
|
|
||
|
if (getsize > fatlength)
|
||
|
getsize = fatlength;
|
||
|
|
||
|
if (mydata->fatbufnum != -1) {
|
||
|
if (flush_fat_buffer(mydata) < 0)
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
if (disk_read(startblock, getsize, bufptr) < 0) {
|
||
|
debug("Error reading FAT blocks\n");
|
||
|
return -1;
|
||
|
}
|
||
|
mydata->fatbufnum = bufnum;
|
||
|
}
|
||
|
|
||
|
/* Set the actual entry */
|
||
|
switch (mydata->fatsize) {
|
||
|
case 32:
|
||
|
((__u32 *) mydata->fatbuf)[offset] = cpu_to_le32(entry_value);
|
||
|
break;
|
||
|
case 16:
|
||
|
((__u16 *) mydata->fatbuf)[offset] = cpu_to_le16(entry_value);
|
||
|
break;
|
||
|
default:
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Determine the entry value at index 'entry' in a FAT (16/32) table
|
||
|
*/
|
||
|
static __u32 determine_fatent(fsdata *mydata, __u32 entry)
|
||
|
{
|
||
|
__u32 next_fat, next_entry = entry + 1;
|
||
|
|
||
|
while (1) {
|
||
|
next_fat = get_fatent_value(mydata, next_entry);
|
||
|
if (next_fat == 0) {
|
||
|
set_fatent_value(mydata, entry, next_entry);
|
||
|
break;
|
||
|
}
|
||
|
next_entry++;
|
||
|
}
|
||
|
debug("FAT%d: entry: %08x, entry_value: %04x\n",
|
||
|
mydata->fatsize, entry, next_entry);
|
||
|
|
||
|
return next_entry;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Write at most 'size' bytes from 'buffer' into the specified cluster.
|
||
|
* Return 0 on success, -1 otherwise.
|
||
|
*/
|
||
|
static int
|
||
|
set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer,
|
||
|
unsigned long size)
|
||
|
{
|
||
|
int idx = 0;
|
||
|
__u32 startsect;
|
||
|
|
||
|
if (clustnum > 0)
|
||
|
startsect = mydata->data_begin +
|
||
|
clustnum * mydata->clust_size;
|
||
|
else
|
||
|
startsect = mydata->rootdir_sect;
|
||
|
|
||
|
debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
|
||
|
|
||
|
if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) {
|
||
|
debug("Error writing data\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
if (size % mydata->sect_size) {
|
||
|
__u8 tmpbuf[mydata->sect_size];
|
||
|
|
||
|
idx = size / mydata->sect_size;
|
||
|
buffer += idx * mydata->sect_size;
|
||
|
memcpy(tmpbuf, buffer, size % mydata->sect_size);
|
||
|
|
||
|
if (disk_write(startsect + idx, 1, tmpbuf) < 0) {
|
||
|
debug("Error writing data\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Find the first empty cluster
|
||
|
*/
|
||
|
static int find_empty_cluster(fsdata *mydata)
|
||
|
{
|
||
|
__u32 fat_val, entry = 3;
|
||
|
|
||
|
while (1) {
|
||
|
fat_val = get_fatent_value(mydata, entry);
|
||
|
if (fat_val == 0)
|
||
|
break;
|
||
|
entry++;
|
||
|
}
|
||
|
|
||
|
return entry;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Write directory entries in 'get_dentfromdir_block' to block device
|
||
|
*/
|
||
|
static void flush_dir_table(fsdata *mydata, dir_entry **dentptr)
|
||
|
{
|
||
|
int dir_newclust = 0;
|
||
|
|
||
|
if (set_cluster(mydata, dir_curclust,
|
||
|
get_dentfromdir_block,
|
||
|
mydata->clust_size * mydata->sect_size) != 0) {
|
||
|
printf("error: wrinting directory entry\n");
|
||
|
return;
|
||
|
}
|
||
|
dir_newclust = find_empty_cluster(mydata);
|
||
|
set_fatent_value(mydata, dir_curclust, dir_newclust);
|
||
|
if (mydata->fatsize == 32)
|
||
|
set_fatent_value(mydata, dir_newclust, 0xffffff8);
|
||
|
else if (mydata->fatsize == 16)
|
||
|
set_fatent_value(mydata, dir_newclust, 0xfff8);
|
||
|
|
||
|
dir_curclust = dir_newclust;
|
||
|
|
||
|
if (flush_fat_buffer(mydata) < 0)
|
||
|
return;
|
||
|
|
||
|
memset(get_dentfromdir_block, 0x00,
|
||
|
mydata->clust_size * mydata->sect_size);
|
||
|
|
||
|
*dentptr = (dir_entry *) get_dentfromdir_block;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Set empty cluster from 'entry' to the end of a file
|
||
|
*/
|
||
|
static int clear_fatent(fsdata *mydata, __u32 entry)
|
||
|
{
|
||
|
__u32 fat_val;
|
||
|
|
||
|
while (1) {
|
||
|
fat_val = get_fatent_value(mydata, entry);
|
||
|
if (fat_val != 0)
|
||
|
set_fatent_value(mydata, entry, 0);
|
||
|
else
|
||
|
break;
|
||
|
|
||
|
if (fat_val == 0xfffffff || fat_val == 0xffff)
|
||
|
break;
|
||
|
|
||
|
entry = fat_val;
|
||
|
}
|
||
|
|
||
|
/* Flush fat buffer */
|
||
|
if (flush_fat_buffer(mydata) < 0)
|
||
|
return -1;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Write at most 'maxsize' bytes from 'buffer' into
|
||
|
* the file associated with 'dentptr'
|
||
|
* Return the number of bytes read or -1 on fatal errors.
|
||
|
*/
|
||
|
static int
|
||
|
set_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
|
||
|
unsigned long maxsize)
|
||
|
{
|
||
|
unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
|
||
|
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
|
||
|
__u32 curclust = START(dentptr);
|
||
|
__u32 endclust = 0, newclust = 0;
|
||
|
unsigned long actsize;
|
||
|
|
||
|
debug("Filesize: %ld bytes\n", filesize);
|
||
|
|
||
|
if (maxsize > 0 && filesize > maxsize)
|
||
|
filesize = maxsize;
|
||
|
|
||
|
debug("%ld bytes\n", filesize);
|
||
|
|
||
|
actsize = bytesperclust;
|
||
|
endclust = curclust;
|
||
|
do {
|
||
|
/* search for consecutive clusters */
|
||
|
while (actsize < filesize) {
|
||
|
newclust = determine_fatent(mydata, endclust);
|
||
|
|
||
|
if ((newclust - 1) != endclust)
|
||
|
goto getit;
|
||
|
|
||
|
if (CHECK_CLUST(newclust, mydata->fatsize)) {
|
||
|
debug("curclust: 0x%x\n", newclust);
|
||
|
debug("Invalid FAT entry\n");
|
||
|
return gotsize;
|
||
|
}
|
||
|
endclust = newclust;
|
||
|
actsize += bytesperclust;
|
||
|
}
|
||
|
/* actsize >= file size */
|
||
|
actsize -= bytesperclust;
|
||
|
/* set remaining clusters */
|
||
|
if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
|
||
|
debug("error: writing cluster\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/* set remaining bytes */
|
||
|
gotsize += (int)actsize;
|
||
|
filesize -= actsize;
|
||
|
buffer += actsize;
|
||
|
actsize = filesize;
|
||
|
|
||
|
if (set_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
|
||
|
debug("error: writing cluster\n");
|
||
|
return -1;
|
||
|
}
|
||
|
gotsize += actsize;
|
||
|
|
||
|
/* Mark end of file in FAT */
|
||
|
if (mydata->fatsize == 16)
|
||
|
newclust = 0xffff;
|
||
|
else if (mydata->fatsize == 32)
|
||
|
newclust = 0xfffffff;
|
||
|
set_fatent_value(mydata, endclust, newclust);
|
||
|
|
||
|
return gotsize;
|
||
|
getit:
|
||
|
if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
|
||
|
debug("error: writing cluster\n");
|
||
|
return -1;
|
||
|
}
|
||
|
gotsize += (int)actsize;
|
||
|
filesize -= actsize;
|
||
|
buffer += actsize;
|
||
|
|
||
|
if (CHECK_CLUST(curclust, mydata->fatsize)) {
|
||
|
debug("curclust: 0x%x\n", curclust);
|
||
|
debug("Invalid FAT entry\n");
|
||
|
return gotsize;
|
||
|
}
|
||
|
actsize = bytesperclust;
|
||
|
curclust = endclust = newclust;
|
||
|
} while (1);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Fill dir_entry
|
||
|
*/
|
||
|
static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
|
||
|
const char *filename, __u32 start_cluster, __u32 size, __u8 attr)
|
||
|
{
|
||
|
if (mydata->fatsize == 32)
|
||
|
dentptr->starthi =
|
||
|
cpu_to_le16((start_cluster & 0xffff0000) >> 16);
|
||
|
dentptr->start = cpu_to_le16(start_cluster & 0xffff);
|
||
|
dentptr->size = cpu_to_le32(size);
|
||
|
|
||
|
dentptr->attr = attr;
|
||
|
|
||
|
set_name(dentptr, filename);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Check whether adding a file makes the file system to
|
||
|
* exceed the size of the block device
|
||
|
* Return -1 when overflow occurs, otherwise return 0
|
||
|
*/
|
||
|
static int check_overflow(fsdata *mydata, __u32 clustnum, unsigned long size)
|
||
|
{
|
||
|
__u32 startsect, sect_num;
|
||
|
|
||
|
if (clustnum > 0) {
|
||
|
startsect = mydata->data_begin +
|
||
|
clustnum * mydata->clust_size;
|
||
|
} else {
|
||
|
startsect = mydata->rootdir_sect;
|
||
|
}
|
||
|
|
||
|
sect_num = size / mydata->sect_size;
|
||
|
if (size % mydata->sect_size)
|
||
|
sect_num++;
|
||
|
|
||
|
if (startsect + sect_num > total_sector)
|
||
|
return -1;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Check if adding several entries exceed one cluster boundary
|
||
|
*/
|
||
|
static int is_next_clust(fsdata *mydata, dir_entry *dentptr)
|
||
|
{
|
||
|
int cur_position;
|
||
|
|
||
|
cur_position = (__u8 *)dentptr - get_dentfromdir_block;
|
||
|
|
||
|
if (cur_position >= mydata->clust_size * mydata->sect_size)
|
||
|
return 1;
|
||
|
else
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static dir_entry *empty_dentptr;
|
||
|
/*
|
||
|
* Find a directory entry based on filename or start cluster number
|
||
|
* If the directory entry is not found,
|
||
|
* the new position for writing a directory entry will be returned
|
||
|
*/
|
||
|
static dir_entry *find_directory_entry(fsdata *mydata, int startsect,
|
||
|
char *filename, dir_entry *retdent, __u32 start)
|
||
|
{
|
||
|
__u16 prevcksum = 0xffff;
|
||
|
__u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size;
|
||
|
|
||
|
debug("get_dentfromdir: %s\n", filename);
|
||
|
|
||
|
while (1) {
|
||
|
dir_entry *dentptr;
|
||
|
|
||
|
int i;
|
||
|
|
||
|
if (get_cluster(mydata, curclust, get_dentfromdir_block,
|
||
|
mydata->clust_size * mydata->sect_size) != 0) {
|
||
|
printf("Error: reading directory block\n");
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
dentptr = (dir_entry *)get_dentfromdir_block;
|
||
|
|
||
|
dir_curclust = curclust;
|
||
|
|
||
|
for (i = 0; i < DIRENTSPERCLUST; i++) {
|
||
|
char s_name[14], l_name[VFAT_MAXLEN_BYTES];
|
||
|
|
||
|
l_name[0] = '\0';
|
||
|
if (dentptr->name[0] == DELETED_FLAG) {
|
||
|
dentptr++;
|
||
|
if (is_next_clust(mydata, dentptr))
|
||
|
break;
|
||
|
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_long_file_name(mydata, curclust,
|
||
|
get_dentfromdir_block,
|
||
|
&dentptr, l_name);
|
||
|
debug("vfatname: |%s|\n", l_name);
|
||
|
} else
|
||
|
#endif
|
||
|
{
|
||
|
/* Volume label or VFAT entry */
|
||
|
dentptr++;
|
||
|
if (is_next_clust(mydata, dentptr))
|
||
|
break;
|
||
|
continue;
|
||
|
}
|
||
|
}
|
||
|
if (dentptr->name[0] == 0) {
|
||
|
debug("Dentname == NULL - %d\n", i);
|
||
|
empty_dentptr = dentptr;
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
get_name(dentptr, s_name);
|
||
|
|
||
|
if (strcmp(filename, s_name)
|
||
|
&& strcmp(filename, l_name)) {
|
||
|
debug("Mismatch: |%s|%s|\n",
|
||
|
s_name, l_name);
|
||
|
dentptr++;
|
||
|
if (is_next_clust(mydata, dentptr))
|
||
|
break;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
memcpy(retdent, dentptr, sizeof(dir_entry));
|
||
|
|
||
|
debug("DentName: %s", s_name);
|
||
|
debug(", start: 0x%x", START(dentptr));
|
||
|
debug(", size: 0x%x %s\n",
|
||
|
FAT2CPU32(dentptr->size),
|
||
|
(dentptr->attr & ATTR_DIR) ?
|
||
|
"(DIR)" : "");
|
||
|
|
||
|
return dentptr;
|
||
|
}
|
||
|
|
||
|
curclust = get_fatent_value(mydata, dir_curclust);
|
||
|
if ((curclust >= 0xffffff8) || (curclust >= 0xfff8)) {
|
||
|
empty_dentptr = dentptr;
|
||
|
return NULL;
|
||
|
}
|
||
|
if (CHECK_CLUST(curclust, mydata->fatsize)) {
|
||
|
debug("curclust: 0x%x\n", curclust);
|
||
|
debug("Invalid FAT entry\n");
|
||
|
return NULL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
static int do_fat_write(const char *filename, void *buffer,
|
||
|
unsigned long size)
|
||
|
{
|
||
|
dir_entry *dentptr, *retdent;
|
||
|
dir_slot *slotptr;
|
||
|
__u32 startsect;
|
||
|
__u32 start_cluster;
|
||
|
boot_sector bs;
|
||
|
volume_info volinfo;
|
||
|
fsdata datablock;
|
||
|
fsdata *mydata = &datablock;
|
||
|
int cursect;
|
||
|
int root_cluster, ret = -1, name_len;
|
||
|
char l_filename[VFAT_MAXLEN_BYTES];
|
||
|
|
||
|
dir_curclust = 0;
|
||
|
|
||
|
if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
|
||
|
debug("error: reading boot sector\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
total_sector = bs.total_sect;
|
||
|
if (total_sector == 0)
|
||
|
total_sector = part_size;
|
||
|
|
||
|
root_cluster = bs.root_cluster;
|
||
|
|
||
|
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->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
|
||
|
mydata->clust_size = bs.cluster_size;
|
||
|
|
||
|
if (mydata->fatsize == 32) {
|
||
|
mydata->data_begin = mydata->rootdir_sect -
|
||
|
(mydata->clust_size * 2);
|
||
|
} else {
|
||
|
int rootdir_size;
|
||
|
|
||
|
rootdir_size = ((bs.dir_entries[1] * (int)256 +
|
||
|
bs.dir_entries[0]) *
|
||
|
sizeof(dir_entry)) /
|
||
|
mydata->sect_size;
|
||
|
mydata->data_begin = mydata->rootdir_sect +
|
||
|
rootdir_size -
|
||
|
(mydata->clust_size * 2);
|
||
|
}
|
||
|
|
||
|
mydata->fatbufnum = -1;
|
||
|
mydata->fatbuf = malloc(FATBUFSIZE);
|
||
|
if (mydata->fatbuf == NULL) {
|
||
|
debug("Error: allocating memory\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
if (disk_read(cursect,
|
||
|
(mydata->fatsize == 32) ?
|
||
|
(mydata->clust_size) :
|
||
|
PREFETCH_BLOCKS, do_fat_read_block) < 0) {
|
||
|
debug("Error: reading rootdir block\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
dentptr = (dir_entry *) do_fat_read_block;
|
||
|
|
||
|
name_len = strlen(filename);
|
||
|
memcpy(l_filename, filename, name_len);
|
||
|
downcase(l_filename);
|
||
|
|
||
|
startsect = mydata->rootdir_sect;
|
||
|
retdent = find_directory_entry(mydata, startsect,
|
||
|
l_filename, dentptr, 0);
|
||
|
if (retdent) {
|
||
|
/* Update file size and start_cluster in a directory entry */
|
||
|
retdent->size = cpu_to_le32(size);
|
||
|
start_cluster = FAT2CPU16(retdent->start);
|
||
|
if (mydata->fatsize == 32)
|
||
|
start_cluster |=
|
||
|
(FAT2CPU16(retdent->starthi) << 16);
|
||
|
|
||
|
ret = check_overflow(mydata, start_cluster, size);
|
||
|
if (ret) {
|
||
|
printf("Error: %ld overflow\n", size);
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
ret = clear_fatent(mydata, start_cluster);
|
||
|
if (ret) {
|
||
|
printf("Error: clearing FAT entries\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
ret = set_contents(mydata, retdent, buffer, size);
|
||
|
if (ret) {
|
||
|
printf("Error: writing contents\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
/* Flush fat buffer */
|
||
|
ret = flush_fat_buffer(mydata);
|
||
|
if (ret) {
|
||
|
printf("Error: flush fat buffer\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
/* Write directory table to device */
|
||
|
ret = set_cluster(mydata, dir_curclust,
|
||
|
get_dentfromdir_block,
|
||
|
mydata->clust_size * mydata->sect_size);
|
||
|
if (ret) {
|
||
|
printf("Error: wrinting directory entry\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
} else {
|
||
|
slotptr = (dir_slot *)empty_dentptr;
|
||
|
|
||
|
/* Set short name to set alias checksum field in dir_slot */
|
||
|
set_name(empty_dentptr, filename);
|
||
|
fill_dir_slot(mydata, &empty_dentptr, filename);
|
||
|
|
||
|
ret = start_cluster = find_empty_cluster(mydata);
|
||
|
if (ret < 0) {
|
||
|
printf("Error: finding empty cluster\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
ret = check_overflow(mydata, start_cluster, size);
|
||
|
if (ret) {
|
||
|
printf("Error: %ld overflow\n", size);
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
/* Set attribute as archieve for regular file */
|
||
|
fill_dentry(mydata, empty_dentptr, filename,
|
||
|
start_cluster, size, 0x20);
|
||
|
|
||
|
ret = set_contents(mydata, empty_dentptr, buffer, size);
|
||
|
if (ret) {
|
||
|
printf("Error: writing contents\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
/* Flush fat buffer */
|
||
|
ret = flush_fat_buffer(mydata);
|
||
|
if (ret) {
|
||
|
printf("Error: flush fat buffer\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
/* Write directory table to device */
|
||
|
ret = set_cluster(mydata, dir_curclust,
|
||
|
get_dentfromdir_block,
|
||
|
mydata->clust_size * mydata->sect_size);
|
||
|
if (ret) {
|
||
|
printf("Error: writing directory entry\n");
|
||
|
goto exit;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
exit:
|
||
|
free(mydata->fatbuf);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int file_fat_write(const char *filename, void *buffer, unsigned long maxsize)
|
||
|
{
|
||
|
printf("writing %s\n", filename);
|
||
|
return do_fat_write(filename, buffer, maxsize);
|
||
|
}
|