--- /dev/null
+/*
+ * fat.c
+ *
+ * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
+ *
+ * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
+ * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <config.h>
+#include <exports.h>
+#include <fat.h>
+#include <asm/byteorder.h>
+#include <part.h>
+#include <malloc.h>
+#include <linux/compiler.h>
+#include <linux/ctype.h>
+
+#ifdef CONFIG_SUPPORT_VFAT
+static const int vfat_enabled = 1;
+#else
+static const int vfat_enabled = 0;
+#endif
+
+/*
+ * Convert a string to lowercase.
+ */
+static void downcase(char *str)
+{
+ while (*str != '\0') {
+ *str = tolower(*str);
+ str++;
+ }
+}
+
+static block_dev_desc_t *cur_dev;
+static disk_partition_t cur_part_info;
+
+#define DOS_BOOT_MAGIC_OFFSET 0x1fe
+#define DOS_FS_TYPE_OFFSET 0x36
+#define DOS_FS32_TYPE_OFFSET 0x52
+
+static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
+{
+ if (!cur_dev || !cur_dev->block_read)
+ return -1;
+
+ return cur_dev->block_read(cur_dev->dev,
+ cur_part_info.start + block, nr_blocks, buf);
+}
+
+int fat_set_blk_dev(block_dev_desc_t *dev_desc, disk_partition_t *info)
+{
+ ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
+
+ cur_dev = dev_desc;
+ cur_part_info = *info;
+
+ /* Make sure it has a valid FAT header */
+ if (disk_read(0, 1, buffer) != 1) {
+ cur_dev = NULL;
+ return -1;
+ }
+
+ /* Check if it's actually a DOS volume */
+ if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
+ cur_dev = NULL;
+ return -1;
+ }
+
+ /* Check for FAT12/FAT16/FAT32 filesystem */
+ if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
+ return 0;
+ if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
+ return 0;
+
+ cur_dev = NULL;
+ return -1;
+}
+
+int fat_register_device(block_dev_desc_t *dev_desc, int part_no)
+{
+ disk_partition_t info;
+
+ /* First close any currently found FAT filesystem */
+ cur_dev = NULL;
+
+ /* Read the partition table, if present */
+ if (get_partition_info(dev_desc, part_no, &info)) {
+ if (part_no != 0) {
+ printf("** Partition %d not valid on device %d **\n",
+ part_no, dev_desc->dev);
+ return -1;
+ }
+
+ info.start = 0;
+ info.size = dev_desc->lba;
+ info.blksz = dev_desc->blksz;
+ info.name[0] = 0;
+ info.type[0] = 0;
+ info.bootable = 0;
+#ifdef CONFIG_PARTITION_UUIDS
+ info.uuid[0] = 0;
+#endif
+ }
+
+ return fat_set_blk_dev(dev_desc, &info);
+}
+
+/*
+ * Get the first occurence of a directory delimiter ('/' or '\') in a string.
+ * Return index into string if found, -1 otherwise.
+ */
+static int dirdelim(char *str)
+{
+ char *start = str;
+
+ while (*str != '\0') {
+ if (ISDIRDELIM(*str))
+ return str - start;
+ str++;
+ }
+ return -1;
+}
+
+/*
+ * Extract zero terminated short name from a directory entry.
+ */
+static void get_name(dir_entry *dirent, char *s_name)
+{
+ char *ptr;
+
+ memcpy(s_name, dirent->name, 8);
+ s_name[8] = '\0';
+ ptr = s_name;
+ while (*ptr && *ptr != ' ')
+ ptr++;
+ if (dirent->ext[0] && dirent->ext[0] != ' ') {
+ *ptr = '.';
+ ptr++;
+ memcpy(ptr, dirent->ext, 3);
+ ptr[3] = '\0';
+ while (*ptr && *ptr != ' ')
+ ptr++;
+ }
+ *ptr = '\0';
+ if (*s_name == DELETED_FLAG)
+ *s_name = '\0';
+ else if (*s_name == aRING)
+ *s_name = DELETED_FLAG;
+ downcase(s_name);
+}
+
+/*
+ * Get the entry at index 'entry' in a FAT (12/16/32) table.
+ * On failure 0x00 is returned.
+ */
+static __u32 get_fatent(fsdata *mydata, __u32 entry)
+{
+ __u32 bufnum;
+ __u32 off16, offset;
+ __u32 ret = 0x00;
+ __u16 val1, val2;
+
+ switch (mydata->fatsize) {
+ case 32:
+ bufnum = entry / FAT32BUFSIZE;
+ offset = entry - bufnum * FAT32BUFSIZE;
+ break;
+ case 16:
+ bufnum = entry / FAT16BUFSIZE;
+ offset = entry - bufnum * FAT16BUFSIZE;
+ break;
+ case 12:
+ bufnum = entry / FAT12BUFSIZE;
+ offset = entry - bufnum * FAT12BUFSIZE;
+ break;
+
+ default:
+ /* Unsupported FAT size */
+ return ret;
+ }
+
+ debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
+ mydata->fatsize, entry, entry, offset, offset);
+
+ /* Read a new block of FAT entries into the cache. */
+ if (bufnum != mydata->fatbufnum) {
+ __u32 getsize = FATBUFBLOCKS;
+ __u8 *bufptr = mydata->fatbuf;
+ __u32 fatlength = mydata->fatlength;
+ __u32 startblock = bufnum * FATBUFBLOCKS;
+
+ if (startblock + getsize > fatlength)
+ getsize = fatlength - startblock;
+
+ startblock += mydata->fat_sect; /* Offset from start of disk */
+
+ if (disk_read(startblock, getsize, bufptr) < 0) {
+ debug("Error reading FAT blocks\n");
+ return ret;
+ }
+ mydata->fatbufnum = bufnum;
+ }
+
+ /* Get the actual entry from the table */
+ switch (mydata->fatsize) {
+ case 32:
+ ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
+ break;
+ case 16:
+ ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
+ break;
+ case 12:
+ off16 = (offset * 3) / 4;
+
+ switch (offset & 0x3) {
+ case 0:
+ ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
+ ret &= 0xfff;
+ break;
+ case 1:
+ val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
+ val1 &= 0xf000;
+ val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
+ val2 &= 0x00ff;
+ ret = (val2 << 4) | (val1 >> 12);
+ break;
+ case 2:
+ val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
+ val1 &= 0xff00;
+ val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
+ val2 &= 0x000f;
+ ret = (val2 << 8) | (val1 >> 8);
+ break;
+ case 3:
+ ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
+ ret = (ret & 0xfff0) >> 4;
+ break;
+ default:
+ break;
+ }
+ break;
+ }
+ debug("FAT%d: ret: %08x, offset: %04x\n",
+ mydata->fatsize, ret, offset);
+
+ return ret;
+}
+
+/*
+ * Read at most 'size' bytes from the specified cluster into 'buffer'.
+ * Return 0 on success, -1 otherwise.
+ */
+static int
+get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
+{
+ __u32 idx = 0;
+ __u32 startsect;
+ int ret;
+
+ if (clustnum > 0) {
+ startsect = mydata->data_begin +
+ clustnum * mydata->clust_size;
+ } else {
+ startsect = mydata->rootdir_sect;
+ }
+
+ debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
+
+ if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
+ ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
+
+ printf("FAT: Misaligned buffer address (%p)\n", buffer);
+
+ while (size >= mydata->sect_size) {
+ ret = disk_read(startsect++, 1, tmpbuf);
+ if (ret != 1) {
+ debug("Error reading data (got %d)\n", ret);
+ return -1;
+ }
+
+ memcpy(buffer, tmpbuf, mydata->sect_size);
+ buffer += mydata->sect_size;
+ size -= mydata->sect_size;
+ }
+ } else {
+ idx = size / mydata->sect_size;
+ ret = disk_read(startsect, idx, buffer);
+ if (ret != idx) {
+ debug("Error reading data (got %d)\n", ret);
+ return -1;
+ }
+ startsect += idx;
+ idx *= mydata->sect_size;
+ buffer += idx;
+ size -= idx;
+ }
+ if (size) {
+ ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
+
+ ret = disk_read(startsect, 1, tmpbuf);
+ if (ret != 1) {
+ debug("Error reading data (got %d)\n", ret);
+ return -1;
+ }
+
+ memcpy(buffer, tmpbuf, size);
+ }
+
+ return 0;
+}
+
+/*
+ * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr'
+ * into 'buffer'.
+ * Return the number of bytes read or -1 on fatal errors.
+ */
+__u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
+ __aligned(ARCH_DMA_MINALIGN);
+
+static long
+get_contents(fsdata *mydata, dir_entry *dentptr, unsigned long pos,
+ __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, newclust;
+ unsigned long actsize;
+
+ debug("Filesize: %ld bytes\n", filesize);
+
+ if (pos >= filesize) {
+ debug("Read position past EOF: %lu\n", pos);
+ return gotsize;
+ }
+
+ if (maxsize > 0 && filesize > pos + maxsize)
+ filesize = pos + maxsize;
+
+ debug("%ld bytes\n", filesize);
+
+ actsize = bytesperclust;
+
+ /* go to cluster at pos */
+ while (actsize <= pos) {
+ curclust = get_fatent(mydata, curclust);
+ if (CHECK_CLUST(curclust, mydata->fatsize)) {
+ debug("curclust: 0x%x\n", curclust);
+ debug("Invalid FAT entry\n");
+ return gotsize;
+ }
+ actsize += bytesperclust;
+ }
+
+ /* actsize > pos */
+ actsize -= bytesperclust;
+ filesize -= actsize;
+ pos -= actsize;
+
+ /* align to beginning of next cluster if any */
+ if (pos) {
+ actsize = min(filesize, bytesperclust);
+ if (get_cluster(mydata, curclust, get_contents_vfatname_block,
+ (int)actsize) != 0) {
+ printf("Error reading cluster\n");
+ return -1;
+ }
+ filesize -= actsize;
+ actsize -= pos;
+ memcpy(buffer, get_contents_vfatname_block + pos, actsize);
+ gotsize += actsize;
+ if (!filesize)
+ return gotsize;
+ buffer += actsize;
+
+ curclust = get_fatent(mydata, curclust);
+ if (CHECK_CLUST(curclust, mydata->fatsize)) {
+ debug("curclust: 0x%x\n", curclust);
+ debug("Invalid FAT entry\n");
+ return gotsize;
+ }
+ }
+
+ actsize = bytesperclust;
+ endclust = curclust;
+
+ do {
+ /* search for consecutive clusters */
+ while (actsize < filesize) {
+ newclust = get_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;
+ }
+
+ /* get remaining bytes */
+ actsize = filesize;
+ if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
+ printf("Error reading cluster\n");
+ return -1;
+ }
+ gotsize += actsize;
+ return gotsize;
+getit:
+ if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
+ printf("Error reading cluster\n");
+ return -1;
+ }
+ gotsize += (int)actsize;
+ filesize -= actsize;
+ buffer += actsize;
+
+ curclust = get_fatent(mydata, endclust);
+ if (CHECK_CLUST(curclust, mydata->fatsize)) {
+ debug("curclust: 0x%x\n", curclust);
+ printf("Invalid FAT entry\n");
+ return gotsize;
+ }
+ actsize = bytesperclust;
+ endclust = curclust;
+ } while (1);
+}
+
+/*
+ * Extract the file name information from 'slotptr' into 'l_name',
+ * starting at l_name[*idx].
+ * Return 1 if terminator (zero byte) is found, 0 otherwise.
+ */
+static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
+{
+ int j;
+
+ for (j = 0; j <= 8; j += 2) {
+ l_name[*idx] = slotptr->name0_4[j];
+ if (l_name[*idx] == 0x00)
+ return 1;
+ (*idx)++;
+ }
+ for (j = 0; j <= 10; j += 2) {
+ l_name[*idx] = slotptr->name5_10[j];
+ if (l_name[*idx] == 0x00)
+ return 1;
+ (*idx)++;
+ }
+ for (j = 0; j <= 2; j += 2) {
+ l_name[*idx] = slotptr->name11_12[j];
+ if (l_name[*idx] == 0x00)
+ return 1;
+ (*idx)++;
+ }
+
+ return 0;
+}
+
+/*
+ * Extract the full long filename starting at 'retdent' (which is really
+ * a slot) into 'l_name'. If successful also copy the real directory entry
+ * into 'retdent'
+ * Return 0 on success, -1 otherwise.
+ */
+static int
+get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
+ dir_entry *retdent, char *l_name)
+{
+ dir_entry *realdent;
+ dir_slot *slotptr = (dir_slot *)retdent;
+ __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
+ PREFETCH_BLOCKS :
+ mydata->clust_size);
+ __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
+ int idx = 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) {
+ dir_slot *slotptr2;
+
+ if (curclust == 0)
+ return -1;
+ curclust = get_fatent(mydata, curclust);
+ if (CHECK_CLUST(curclust, mydata->fatsize)) {
+ debug("curclust: 0x%x\n", curclust);
+ printf("Invalid FAT entry\n");
+ return -1;
+ }
+
+ if (get_cluster(mydata, curclust, get_contents_vfatname_block,
+ mydata->clust_size * mydata->sect_size) != 0) {
+ debug("Error: reading directory block\n");
+ return -1;
+ }
+
+ slotptr2 = (dir_slot *)get_contents_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_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(" %8ld %s%c\n",
+ (long)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(" %8ld %s%c\n",
+ (long)FAT2CPU32(dentptr->size),
+ s_name, dirc);
+ } else {
+ printf(" %s%c\n",
+ s_name, dirc);
+ }
+ }
+
+ dentptr++;
+ continue;
+ }
+
+ if (strcmp(filename, s_name)
+ && strcmp(filename, l_name)) {
+ 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);
+
+long
+do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
+ unsigned long maxsize, int dols, int dogetsize)
+{
+ 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;
+ long ret = -1;
+ int firsttime;
+ __u32 root_cluster = 0;
+ int rootdir_size = 0;
+ int j;
+
+ 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->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);
+
+ 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;
+ }
+
+ j = 0;
+ while (1) {
+ int i;
+
+ if (j == 0) {
+ debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n",
+ cursect, mydata->clust_size, DIRENTSPERBLOCK);
+
+ if (disk_read(cursect,
+ (mydata->fatsize == 32) ?
+ (mydata->clust_size) :
+ PREFETCH_BLOCKS,
+ do_fat_read_at_block) < 0) {
+ debug("Error: reading rootdir block\n");
+ goto exit;
+ }
+
+ dentptr = (dir_entry *) do_fat_read_at_block;
+ }
+
+ 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,
+ do_fat_read_at_block,
+ 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(" %8ld %s%c\n",
+ (long)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(" %8ld %s%c\n",
+ (long)FAT2CPU32(dentptr->size),
+ s_name, dirc);
+ } else {
+ printf(" %s%c\n",
+ s_name, dirc);
+ }
+ }
+ dentptr++;
+ continue;
+ }
+
+ if (strcmp(fnamecopy, s_name)
+ && strcmp(fnamecopy, l_name)) {
+ 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: j=%d clust_size=%d\n", j,
+ mydata->clust_size);
+
+ /*
+ * On FAT32 we must fetch the FAT entries for the next
+ * root directory clusters when a cluster has been
+ * completely processed.
+ */
+ ++j;
+ int rootdir_end = 0;
+ if (mydata->fatsize == 32) {
+ if (j == 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;
+ j = 0;
+ }
+ } else {
+ if (j == PREFETCH_BLOCKS)
+ j = 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);
+ ret = 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)
+ ret = 0;
+ goto exit;
+ }
+
+ if (isdir && !(dentptr->attr & ATTR_DIR))
+ goto exit;
+
+ if (idx >= 0)
+ subname = nextname;
+ }
+
+ if (dogetsize)
+ ret = FAT2CPU32(dentptr->size);
+ else
+ ret = get_contents(mydata, dentptr, pos, buffer, maxsize);
+ debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
+
+exit:
+ free(mydata->fatbuf);
+ return ret;
+}
+
+long
+do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
+{
+ return do_fat_read_at(filename, 0, buffer, maxsize, dols, 0);
+}
+
+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_CMD_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->dev);
+ dev_print(cur_dev);
+#endif
+
+ if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
+ printf("\nNo valid FAT fs found\n");
+ return 1;
+ }
+
+ memcpy(vol_label, volinfo.volume_label, 11);
+ vol_label[11] = '\0';
+ volinfo.fs_type[5] = '\0';
+
+ printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label);
+
+ return 0;
+}
+
+int file_fat_ls(const char *dir)
+{
+ return do_fat_read(dir, NULL, 0, LS_YES);
+}
+
+int fat_exists(const char *filename)
+{
+ int sz;
+ sz = do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1);
+ return sz >= 0;
+}
+
+long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
+ unsigned long maxsize)
+{
+ printf("reading %s\n", filename);
+ return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO, 0);
+}
+
+long file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
+{
+ return file_fat_read_at(filename, 0, buffer, maxsize);
+}
+
+int fat_read_file(const char *filename, void *buf, int offset, int len)
+{
+ int len_read;
+
+ len_read = file_fat_read_at(filename, offset, buf, len);
+ if (len_read == -1) {
+ printf("** Unable to read file %s **\n", filename);
+ return -1;
+ }
+
+ return len_read;
+}
+
+void fat_close(void)
+{
+}
Code Review / kvmfornfv.git / blobdiff