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https://github.com/brain-hackers/u-boot-brain
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![Stefan Brüns](/assets/img/avatar_default.png)
Instead of shuffling bits from two adjacent 16 bit words, use one 16 bit word with the appropriate byte offset in the buffer. Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
1358 lines
30 KiB
C
1358 lines
30 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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <blk.h>
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#include <config.h>
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#include <exports.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 <malloc.h>
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#include <memalign.h>
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#include <linux/compiler.h>
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#include <linux/ctype.h>
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#ifdef CONFIG_SUPPORT_VFAT
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static const int vfat_enabled = 1;
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#else
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static const int vfat_enabled = 0;
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#endif
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/*
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* Convert a string to lowercase.
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*/
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static void downcase(char *str)
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{
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while (*str != '\0') {
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*str = tolower(*str);
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str++;
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}
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}
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static struct blk_desc *cur_dev;
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static disk_partition_t cur_part_info;
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#define DOS_BOOT_MAGIC_OFFSET 0x1fe
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#define DOS_FS_TYPE_OFFSET 0x36
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#define DOS_FS32_TYPE_OFFSET 0x52
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static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
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{
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ulong ret;
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if (!cur_dev)
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return -1;
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ret = blk_dread(cur_dev, cur_part_info.start + block, nr_blocks, buf);
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if (nr_blocks && ret == 0)
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return -1;
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return ret;
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}
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int fat_set_blk_dev(struct blk_desc *dev_desc, disk_partition_t *info)
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{
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ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
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cur_dev = dev_desc;
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cur_part_info = *info;
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/* Make sure it has a valid FAT header */
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if (disk_read(0, 1, buffer) != 1) {
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cur_dev = NULL;
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return -1;
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}
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/* Check if it's actually a DOS volume */
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if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
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cur_dev = NULL;
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return -1;
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}
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/* Check for FAT12/FAT16/FAT32 filesystem */
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if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
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return 0;
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if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
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return 0;
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cur_dev = NULL;
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return -1;
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}
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int fat_register_device(struct blk_desc *dev_desc, int part_no)
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{
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disk_partition_t info;
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/* First close any currently found FAT filesystem */
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cur_dev = NULL;
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/* Read the partition table, if present */
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if (part_get_info(dev_desc, part_no, &info)) {
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if (part_no != 0) {
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printf("** Partition %d not valid on device %d **\n",
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part_no, dev_desc->devnum);
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return -1;
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}
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info.start = 0;
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info.size = dev_desc->lba;
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info.blksz = dev_desc->blksz;
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info.name[0] = 0;
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info.type[0] = 0;
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info.bootable = 0;
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#ifdef CONFIG_PARTITION_UUIDS
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info.uuid[0] = 0;
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#endif
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}
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return fat_set_blk_dev(dev_desc, &info);
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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 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))
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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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* 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 = DELETED_FLAG;
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downcase(s_name);
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}
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static int flush_dirty_fat_buffer(fsdata *mydata);
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#if !defined(CONFIG_FAT_WRITE)
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/* Stub for read only operation */
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int flush_dirty_fat_buffer(fsdata *mydata)
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{
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(void)(mydata);
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return 0;
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}
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#endif
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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 get_fatent(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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if (CHECK_CLUST(entry, mydata->fatsize)) {
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printf("Error: Invalid FAT entry: 0x%08x\n", entry);
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return ret;
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}
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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%08x = %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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__u32 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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/* Cap length if fatlength is not a multiple of FATBUFBLOCKS */
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if (startblock + getsize > fatlength)
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getsize = fatlength - startblock;
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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 (flush_dirty_fat_buffer(mydata) < 0)
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return -1;
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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) / 2;
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ret = FAT2CPU16(*(__u16 *)(mydata->fatbuf + off16));
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if (offset & 0x1)
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ret >>= 4;
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ret &= 0xfff;
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}
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debug("FAT%d: ret: 0x%08x, entry: 0x%08x, offset: 0x%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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/*
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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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__u32 idx = 0;
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__u32 startsect;
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int ret;
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if (clustnum > 0) {
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startsect = mydata->data_begin +
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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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debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
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if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
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ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
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printf("FAT: Misaligned buffer address (%p)\n", buffer);
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while (size >= mydata->sect_size) {
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ret = disk_read(startsect++, 1, tmpbuf);
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if (ret != 1) {
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debug("Error reading data (got %d)\n", ret);
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return -1;
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}
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memcpy(buffer, tmpbuf, mydata->sect_size);
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buffer += mydata->sect_size;
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size -= mydata->sect_size;
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}
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} else {
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idx = size / mydata->sect_size;
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ret = disk_read(startsect, idx, buffer);
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if (ret != idx) {
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debug("Error reading data (got %d)\n", ret);
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return -1;
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}
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startsect += idx;
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idx *= mydata->sect_size;
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buffer += idx;
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size -= idx;
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}
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if (size) {
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ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
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ret = disk_read(startsect, 1, tmpbuf);
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if (ret != 1) {
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debug("Error reading data (got %d)\n", ret);
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return -1;
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}
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memcpy(buffer, tmpbuf, size);
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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 'pos' in the file associated with 'dentptr'
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* into 'buffer'.
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* Update the number of bytes read in *gotsize or return -1 on fatal errors.
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*/
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__u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
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__aligned(ARCH_DMA_MINALIGN);
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static int get_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos,
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__u8 *buffer, loff_t maxsize, loff_t *gotsize)
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{
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loff_t filesize = FAT2CPU32(dentptr->size);
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unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
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__u32 curclust = START(dentptr);
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__u32 endclust, newclust;
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loff_t actsize;
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*gotsize = 0;
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debug("Filesize: %llu bytes\n", filesize);
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if (pos >= filesize) {
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debug("Read position past EOF: %llu\n", pos);
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return 0;
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}
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if (maxsize > 0 && filesize > pos + maxsize)
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filesize = pos + maxsize;
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debug("%llu bytes\n", filesize);
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actsize = bytesperclust;
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/* go to cluster at pos */
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while (actsize <= pos) {
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curclust = get_fatent(mydata, curclust);
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if (CHECK_CLUST(curclust, mydata->fatsize)) {
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debug("curclust: 0x%x\n", curclust);
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debug("Invalid FAT entry\n");
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return 0;
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}
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actsize += bytesperclust;
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}
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/* actsize > pos */
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actsize -= bytesperclust;
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filesize -= actsize;
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pos -= actsize;
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/* align to beginning of next cluster if any */
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if (pos) {
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actsize = min(filesize, (loff_t)bytesperclust);
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if (get_cluster(mydata, curclust, get_contents_vfatname_block,
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(int)actsize) != 0) {
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printf("Error reading cluster\n");
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return -1;
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}
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filesize -= actsize;
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actsize -= pos;
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memcpy(buffer, get_contents_vfatname_block + pos, actsize);
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*gotsize += actsize;
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if (!filesize)
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return 0;
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buffer += actsize;
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curclust = get_fatent(mydata, curclust);
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if (CHECK_CLUST(curclust, mydata->fatsize)) {
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debug("curclust: 0x%x\n", curclust);
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debug("Invalid FAT entry\n");
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return 0;
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}
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}
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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 (CHECK_CLUST(newclust, mydata->fatsize)) {
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debug("curclust: 0x%x\n", newclust);
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debug("Invalid FAT entry\n");
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return 0;
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}
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endclust = newclust;
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actsize += bytesperclust;
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}
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/* get remaining bytes */
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actsize = filesize;
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if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
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printf("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 0;
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getit:
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if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
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printf("Error reading cluster\n");
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return -1;
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}
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*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 (CHECK_CLUST(curclust, mydata->fatsize)) {
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debug("curclust: 0x%x\n", curclust);
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printf("Invalid FAT entry\n");
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return 0;
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}
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actsize = bytesperclust;
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endclust = curclust;
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} while (1);
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}
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/*
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* Extract the file name information from 'slotptr' into 'l_name',
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* starting at l_name[*idx].
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* Return 1 if terminator (zero byte) is found, 0 otherwise.
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*/
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static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
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{
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int j;
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for (j = 0; j <= 8; j += 2) {
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l_name[*idx] = slotptr->name0_4[j];
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if (l_name[*idx] == 0x00)
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return 1;
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(*idx)++;
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}
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for (j = 0; j <= 10; j += 2) {
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l_name[*idx] = slotptr->name5_10[j];
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if (l_name[*idx] == 0x00)
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return 1;
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(*idx)++;
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}
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for (j = 0; j <= 2; j += 2) {
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l_name[*idx] = slotptr->name11_12[j];
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if (l_name[*idx] == 0x00)
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return 1;
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(*idx)++;
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}
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return 0;
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}
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/*
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* Extract the full long filename starting at 'retdent' (which is really
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* a slot) into 'l_name'. If successful also copy the real directory entry
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* into 'retdent'
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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_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
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dir_entry *retdent, char *l_name)
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{
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dir_entry *realdent;
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dir_slot *slotptr = (dir_slot *)retdent;
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__u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
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PREFETCH_BLOCKS :
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mydata->clust_size);
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__u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
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int idx = 0;
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if (counter > VFAT_MAXSEQ) {
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debug("Error: VFAT name is too long\n");
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return -1;
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}
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while ((__u8 *)slotptr < buflimit) {
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if (counter == 0)
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break;
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if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
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return -1;
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slotptr++;
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counter--;
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}
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if ((__u8 *)slotptr >= buflimit) {
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dir_slot *slotptr2;
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if (curclust == 0)
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return -1;
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curclust = get_fatent(mydata, curclust);
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if (CHECK_CLUST(curclust, mydata->fatsize)) {
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debug("curclust: 0x%x\n", curclust);
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printf("Invalid FAT entry\n");
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return -1;
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}
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if (get_cluster(mydata, curclust, get_contents_vfatname_block,
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mydata->clust_size * mydata->sect_size) != 0) {
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debug("Error: reading directory block\n");
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return -1;
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}
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slotptr2 = (dir_slot *)get_contents_vfatname_block;
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while (counter > 0) {
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if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
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& 0xff) != counter)
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return -1;
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slotptr2++;
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counter--;
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}
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/* Save the real directory entry */
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realdent = (dir_entry *)slotptr2;
|
|
while ((__u8 *)slotptr2 > get_contents_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 */
|
|
memcpy(retdent, realdent, sizeof(dir_entry));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Calculate short name checksum */
|
|
static __u8 mkcksum(const char name[8], const char ext[3])
|
|
{
|
|
int i;
|
|
|
|
__u8 ret = 0;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i];
|
|
for (i = 0; i < 3; i++)
|
|
ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i];
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Get the directory entry associated with 'filename' from the directory
|
|
* starting at 'startsect'
|
|
*/
|
|
__u8 get_dentfromdir_block[MAX_CLUSTSIZE]
|
|
__aligned(ARCH_DMA_MINALIGN);
|
|
|
|
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;
|
|
|
|
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) {
|
|
debug("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[VFAT_MAXLEN_BYTES];
|
|
|
|
l_name[0] = '\0';
|
|
if (dentptr->name[0] == DELETED_FLAG) {
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
if ((dentptr->attr & ATTR_VOLUME)) {
|
|
if (vfat_enabled &&
|
|
(dentptr->attr & ATTR_VFAT) == 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;
|
|
char dirc;
|
|
int doit = 0;
|
|
|
|
isdir = (dentptr->attr & ATTR_DIR);
|
|
|
|
if (isdir) {
|
|
dirs++;
|
|
dirc = '/';
|
|
doit = 1;
|
|
} else {
|
|
dirc = ' ';
|
|
if (l_name[0] != 0) {
|
|
files++;
|
|
doit = 1;
|
|
}
|
|
}
|
|
if (doit) {
|
|
if (dirc == ' ') {
|
|
printf(" %8u %s%c\n",
|
|
FAT2CPU32(dentptr->size),
|
|
l_name,
|
|
dirc);
|
|
} else {
|
|
printf(" %s%c\n",
|
|
l_name,
|
|
dirc);
|
|
}
|
|
}
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
debug("vfatname: |%s|\n", l_name);
|
|
} else {
|
|
/* 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);
|
|
}
|
|
debug("Dentname == NULL - %d\n", i);
|
|
return NULL;
|
|
}
|
|
if (vfat_enabled) {
|
|
__u8 csum = mkcksum(dentptr->name, dentptr->ext);
|
|
if (dols && csum == prevcksum) {
|
|
prevcksum = 0xffff;
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
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(" %8u %s%c\n",
|
|
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)) {
|
|
debug("Mismatch: |%s|%s|\n", s_name, l_name);
|
|
dentptr++;
|
|
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 retdent;
|
|
}
|
|
|
|
curclust = get_fatent(mydata, curclust);
|
|
if (CHECK_CLUST(curclust, mydata->fatsize)) {
|
|
debug("curclust: 0x%x\n", curclust);
|
|
printf("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;
|
|
volume_info *vistart;
|
|
int ret = 0;
|
|
|
|
if (cur_dev == NULL) {
|
|
debug("Error: no device selected\n");
|
|
return -1;
|
|
}
|
|
|
|
block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz);
|
|
if (block == NULL) {
|
|
debug("Error: allocating block\n");
|
|
return -1;
|
|
}
|
|
|
|
if (disk_read(0, 1, block) < 0) {
|
|
debug("Error: reading block\n");
|
|
goto fail;
|
|
}
|
|
|
|
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);
|
|
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));
|
|
|
|
if (*fatsize == 32) {
|
|
if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
|
|
goto exit;
|
|
} else {
|
|
if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
|
|
*fatsize = 12;
|
|
goto exit;
|
|
}
|
|
if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
|
|
*fatsize = 16;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
debug("Error: broken fs_type sign\n");
|
|
fail:
|
|
ret = -1;
|
|
exit:
|
|
free(block);
|
|
return ret;
|
|
}
|
|
|
|
__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
|
|
__aligned(ARCH_DMA_MINALIGN);
|
|
|
|
int do_fat_read_at(const char *filename, loff_t pos, void *buffer,
|
|
loff_t maxsize, int dols, int dogetsize, loff_t *size)
|
|
{
|
|
char fnamecopy[2048];
|
|
boot_sector bs;
|
|
volume_info volinfo;
|
|
fsdata datablock;
|
|
fsdata *mydata = &datablock;
|
|
dir_entry *dentptr = NULL;
|
|
__u16 prevcksum = 0xffff;
|
|
char *subname = "";
|
|
__u32 cursect;
|
|
int idx, isdir = 0;
|
|
int files = 0, dirs = 0;
|
|
int ret = -1;
|
|
int firsttime;
|
|
__u32 root_cluster = 0;
|
|
__u32 read_blk;
|
|
int rootdir_size = 0;
|
|
int buffer_blk_cnt;
|
|
int do_read;
|
|
__u8 *dir_ptr;
|
|
|
|
if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
|
|
debug("Error: reading boot sector\n");
|
|
return -1;
|
|
}
|
|
|
|
if (mydata->fatsize == 32) {
|
|
root_cluster = bs.root_cluster;
|
|
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->sect_size != cur_part_info.blksz) {
|
|
printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n",
|
|
mydata->sect_size, cur_part_info.blksz);
|
|
return -1;
|
|
}
|
|
|
|
if (mydata->fatsize == 32) {
|
|
mydata->data_begin = mydata->rootdir_sect -
|
|
(mydata->clust_size * 2);
|
|
} else {
|
|
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->fat_dirty = 0;
|
|
mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
|
|
if (mydata->fatbuf == NULL) {
|
|
debug("Error: allocating memory\n");
|
|
return -1;
|
|
}
|
|
|
|
if (vfat_enabled)
|
|
debug("VFAT Support enabled\n");
|
|
|
|
debug("FAT%d, fat_sect: %d, fatlength: %d\n",
|
|
mydata->fatsize, mydata->fat_sect, mydata->fatlength);
|
|
debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
|
|
"Data begins at: %d\n",
|
|
root_cluster,
|
|
mydata->rootdir_sect,
|
|
mydata->rootdir_sect * mydata->sect_size, mydata->data_begin);
|
|
debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
|
|
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);
|
|
|
|
root_reparse:
|
|
if (*fnamecopy == '\0') {
|
|
if (!dols)
|
|
goto exit;
|
|
|
|
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;
|
|
}
|
|
|
|
buffer_blk_cnt = 0;
|
|
firsttime = 1;
|
|
while (1) {
|
|
int i;
|
|
|
|
if (mydata->fatsize == 32 || firsttime) {
|
|
dir_ptr = do_fat_read_at_block;
|
|
firsttime = 0;
|
|
} else {
|
|
/**
|
|
* FAT16 sector buffer modification:
|
|
* Each loop, the second buffered block is moved to
|
|
* the buffer begin, and two next sectors are read
|
|
* next to the previously moved one. So the sector
|
|
* buffer keeps always 3 sectors for fat16.
|
|
* And the current sector is the buffer second sector
|
|
* beside the "firsttime" read, when it is the first one.
|
|
*
|
|
* PREFETCH_BLOCKS is 2 for FAT16 == loop[0:1]
|
|
* n = computed root dir sector
|
|
* loop | cursect-1 | cursect | cursect+1 |
|
|
* 0 | sector n+0 | sector n+1 | none |
|
|
* 1 | none | sector n+0 | sector n+1 |
|
|
* 0 | sector n+1 | sector n+2 | sector n+3 |
|
|
* 1 | sector n+3 | ...
|
|
*/
|
|
dir_ptr = (do_fat_read_at_block + mydata->sect_size);
|
|
memcpy(do_fat_read_at_block, dir_ptr, mydata->sect_size);
|
|
}
|
|
|
|
do_read = 1;
|
|
|
|
if (mydata->fatsize == 32 && buffer_blk_cnt)
|
|
do_read = 0;
|
|
|
|
if (do_read) {
|
|
read_blk = (mydata->fatsize == 32) ?
|
|
mydata->clust_size : PREFETCH_BLOCKS;
|
|
|
|
debug("FAT read(sect=%d, cnt:%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n",
|
|
cursect, read_blk, mydata->clust_size, DIRENTSPERBLOCK);
|
|
|
|
if (disk_read(cursect, read_blk, dir_ptr) < 0) {
|
|
debug("Error: reading rootdir block\n");
|
|
goto exit;
|
|
}
|
|
|
|
dentptr = (dir_entry *)dir_ptr;
|
|
}
|
|
|
|
for (i = 0; i < DIRENTSPERBLOCK; i++) {
|
|
char s_name[14], l_name[VFAT_MAXLEN_BYTES];
|
|
__u8 csum;
|
|
|
|
l_name[0] = '\0';
|
|
if (dentptr->name[0] == DELETED_FLAG) {
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
|
|
if (vfat_enabled)
|
|
csum = mkcksum(dentptr->name, dentptr->ext);
|
|
|
|
if (dentptr->attr & ATTR_VOLUME) {
|
|
if (vfat_enabled &&
|
|
(dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
|
|
(dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
|
|
prevcksum =
|
|
((dir_slot *)dentptr)->alias_checksum;
|
|
|
|
get_vfatname(mydata,
|
|
root_cluster,
|
|
dir_ptr,
|
|
dentptr, l_name);
|
|
|
|
if (dols == LS_ROOT) {
|
|
char dirc;
|
|
int doit = 0;
|
|
int isdir =
|
|
(dentptr->attr & ATTR_DIR);
|
|
|
|
if (isdir) {
|
|
dirs++;
|
|
dirc = '/';
|
|
doit = 1;
|
|
} else {
|
|
dirc = ' ';
|
|
if (l_name[0] != 0) {
|
|
files++;
|
|
doit = 1;
|
|
}
|
|
}
|
|
if (doit) {
|
|
if (dirc == ' ') {
|
|
printf(" %8u %s%c\n",
|
|
FAT2CPU32(dentptr->size),
|
|
l_name,
|
|
dirc);
|
|
} else {
|
|
printf(" %s%c\n",
|
|
l_name,
|
|
dirc);
|
|
}
|
|
}
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
debug("Rootvfatname: |%s|\n",
|
|
l_name);
|
|
} else {
|
|
/* Volume label or VFAT entry */
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
} else if (dentptr->name[0] == 0) {
|
|
debug("RootDentname == NULL - %d\n", i);
|
|
if (dols == LS_ROOT) {
|
|
printf("\n%d file(s), %d dir(s)\n\n",
|
|
files, dirs);
|
|
ret = 0;
|
|
}
|
|
goto exit;
|
|
}
|
|
else if (vfat_enabled &&
|
|
dols == LS_ROOT && csum == prevcksum) {
|
|
prevcksum = 0xffff;
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
|
|
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(" %8u %s%c\n",
|
|
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)) {
|
|
debug("RootMismatch: |%s|%s|\n", s_name,
|
|
l_name);
|
|
dentptr++;
|
|
continue;
|
|
}
|
|
|
|
if (isdir && !(dentptr->attr & ATTR_DIR))
|
|
goto exit;
|
|
|
|
debug("RootName: %s", s_name);
|
|
debug(", start: 0x%x", START(dentptr));
|
|
debug(", size: 0x%x %s\n",
|
|
FAT2CPU32(dentptr->size),
|
|
isdir ? "(DIR)" : "");
|
|
|
|
goto rootdir_done; /* We got a match */
|
|
}
|
|
debug("END LOOP: buffer_blk_cnt=%d clust_size=%d\n", buffer_blk_cnt,
|
|
mydata->clust_size);
|
|
|
|
/*
|
|
* On FAT32 we must fetch the FAT entries for the next
|
|
* root directory clusters when a cluster has been
|
|
* completely processed.
|
|
*/
|
|
++buffer_blk_cnt;
|
|
int rootdir_end = 0;
|
|
if (mydata->fatsize == 32) {
|
|
if (buffer_blk_cnt == mydata->clust_size) {
|
|
int nxtsect = 0;
|
|
int nxt_clust = 0;
|
|
|
|
nxt_clust = get_fatent(mydata, root_cluster);
|
|
rootdir_end = CHECK_CLUST(nxt_clust, 32);
|
|
|
|
nxtsect = mydata->data_begin +
|
|
(nxt_clust * mydata->clust_size);
|
|
|
|
root_cluster = nxt_clust;
|
|
|
|
cursect = nxtsect;
|
|
buffer_blk_cnt = 0;
|
|
}
|
|
} else {
|
|
if (buffer_blk_cnt == PREFETCH_BLOCKS)
|
|
buffer_blk_cnt = 0;
|
|
|
|
rootdir_end = (++cursect - mydata->rootdir_sect >=
|
|
rootdir_size);
|
|
}
|
|
|
|
/* If end of rootdir reached */
|
|
if (rootdir_end) {
|
|
if (dols == LS_ROOT) {
|
|
printf("\n%d file(s), %d dir(s)\n\n",
|
|
files, dirs);
|
|
*size = 0;
|
|
}
|
|
goto exit;
|
|
}
|
|
}
|
|
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)
|
|
*size = 0;
|
|
goto exit;
|
|
}
|
|
|
|
if (isdir && !(dentptr->attr & ATTR_DIR))
|
|
goto exit;
|
|
|
|
/*
|
|
* If we are looking for a directory, and found a directory
|
|
* type entry, and the entry is for the root directory (as
|
|
* denoted by a cluster number of 0), jump back to the start
|
|
* of the function, since at least on FAT12/16, the root dir
|
|
* lives in a hard-coded location and needs special handling
|
|
* to parse, rather than simply following the cluster linked
|
|
* list in the FAT, like other directories.
|
|
*/
|
|
if (isdir && (dentptr->attr & ATTR_DIR) && !START(dentptr)) {
|
|
/*
|
|
* Modify the filename to remove the prefix that gets
|
|
* back to the root directory, so the initial root dir
|
|
* parsing code can continue from where we are without
|
|
* confusion.
|
|
*/
|
|
strcpy(fnamecopy, nextname ?: "");
|
|
/*
|
|
* Set up state the same way as the function does when
|
|
* first started. This is required for the root dir
|
|
* parsing code operates in its expected environment.
|
|
*/
|
|
subname = "";
|
|
cursect = mydata->rootdir_sect;
|
|
isdir = 0;
|
|
goto root_reparse;
|
|
}
|
|
|
|
if (idx >= 0)
|
|
subname = nextname;
|
|
}
|
|
|
|
if (dogetsize) {
|
|
*size = FAT2CPU32(dentptr->size);
|
|
ret = 0;
|
|
} else {
|
|
ret = get_contents(mydata, dentptr, pos, buffer, maxsize, size);
|
|
}
|
|
debug("Size: %u, got: %llu\n", FAT2CPU32(dentptr->size), *size);
|
|
|
|
exit:
|
|
free(mydata->fatbuf);
|
|
return ret;
|
|
}
|
|
|
|
int do_fat_read(const char *filename, void *buffer, loff_t maxsize, int dols,
|
|
loff_t *actread)
|
|
{
|
|
return do_fat_read_at(filename, 0, buffer, maxsize, dols, 0, actread);
|
|
}
|
|
|
|
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_SATA) || \
|
|
defined(CONFIG_SCSI) || \
|
|
defined(CONFIG_CMD_USB) || \
|
|
defined(CONFIG_MMC)
|
|
printf("Interface: ");
|
|
switch (cur_dev->if_type) {
|
|
case IF_TYPE_IDE:
|
|
printf("IDE");
|
|
break;
|
|
case IF_TYPE_SATA:
|
|
printf("SATA");
|
|
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->devnum);
|
|
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("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int file_fat_ls(const char *dir)
|
|
{
|
|
loff_t size;
|
|
|
|
return do_fat_read(dir, NULL, 0, LS_YES, &size);
|
|
}
|
|
|
|
int fat_exists(const char *filename)
|
|
{
|
|
int ret;
|
|
loff_t size;
|
|
|
|
ret = do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1, &size);
|
|
return ret == 0;
|
|
}
|
|
|
|
int fat_size(const char *filename, loff_t *size)
|
|
{
|
|
return do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1, size);
|
|
}
|
|
|
|
int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
|
|
loff_t maxsize, loff_t *actread)
|
|
{
|
|
printf("reading %s\n", filename);
|
|
return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO, 0,
|
|
actread);
|
|
}
|
|
|
|
int file_fat_read(const char *filename, void *buffer, int maxsize)
|
|
{
|
|
loff_t actread;
|
|
int ret;
|
|
|
|
ret = file_fat_read_at(filename, 0, buffer, maxsize, &actread);
|
|
if (ret)
|
|
return ret;
|
|
else
|
|
return actread;
|
|
}
|
|
|
|
int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
|
|
loff_t *actread)
|
|
{
|
|
int ret;
|
|
|
|
ret = file_fat_read_at(filename, offset, buf, len, actread);
|
|
if (ret)
|
|
printf("** Unable to read file %s **\n", filename);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void fat_close(void)
|
|
{
|
|
}
|