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fat.c

/*
 * 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
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <config.h>
#include <part.h>
#include <fat.h>
#include <asm/byteorder.h>

#ifdef CFG_CMD_FAT

/*
 * Convert a string to lowercase.
 */
static void
downcase(char *str)
{
      while (*str != '\0') {
            TOLOWER(*str);
            str++;
      }
}

static  block_dev_desc_t *cur_dev = NULL;
static unsigned long part_offset = 0;
static int cur_part = 1;

#define DOS_PART_TBL_OFFSET   0x1be
#define DOS_PART_MAGIC_OFFSET 0x1fe
#define DOS_FS_TYPE_OFFSET    0x52

int strncmp(const char * cs,const char * ct,size_t count)
{
        register signed char __res = 0;

        while (count) {
                if ((__res = *cs - *ct++) != 0 || !*cs++)
                        break;
                count--;
        }

        return __res;
}

char * strcpy(char * dest,const char *src)
{
        char *tmp = dest;

        while ((*dest++ = *src++) != '\0')
                /* nothing */;
        return tmp;
}

int strcmp(const char * cs,const char * ct)
{
        register signed char __res;

        while (1) {
                if ((__res = *cs - *ct++) != 0 || !*cs++)
                        break;
        }

        return __res;
}
void * memcpy(void * dest,const void *src,size_t count)
{
        char *tmp = (char *) dest, *s = (char *) src;

        while (count--)
                *tmp++ = *s++;

        return dest;
}


int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr)
{
      startblock += part_offset;
      if (cur_dev == NULL)
            return -1;
      if (cur_dev->block_read) {
            return cur_dev->block_read (cur_dev->dev, startblock, getsize, (unsigned long *)bufptr);
      }
      return -1;
}


int
fat_register_device(block_dev_desc_t *dev_desc, int part_no)
{
      unsigned char buffer[SECTOR_SIZE];

      if (!dev_desc->block_read)
            return -1;
      cur_dev=dev_desc;
      /* check if we have a MBR (on floppies we have only a PBR) */
      if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) {
            printf ("** Can't read from device %d **\n", dev_desc->dev);
            return -1;
      }
      if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
            buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
            /* no signature found */
            return -1;
      }
      if(!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
            /* ok, we assume we are on a PBR only */
            cur_part = 1;
            part_offset=0;
      }
      else {
#if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) || \
    (CONFIG_COMMANDS & CFG_CMD_USB) || (CONFIG_COMMANDS & CFG_CMD_MMC) || defined(CONFIG_SYSTEMACE)
            disk_partition_t info;
            if(!get_partition_info(dev_desc, part_no, &info)) {
                  part_offset = info.start;
                  cur_part = part_no;
            }
            else {
                  printf ("** Partition %d not valid on device %d **\n",part_no,dev_desc->dev);
                  return -1;
            }
#else
            /* FIXME we need to determine the start block of the
             * partition where the DOS FS resides. This can be done
             * by using the get_partition_info routine. For this
             * purpose the libpart must be included.
             */
            part_offset=63;
            //part_offset=0;
            cur_part = 1;
#endif
      }
      return 0;
}


/*
 * 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;
}


/*
 * Match volume_info fs_type strings.
 * Return 0 on match, -1 otherwise.
 */
static int
compare_sign(char *str1, char *str2)
{
      char *end = str1+SIGNLEN;
      
      while (str1 != end) {
            if (*str1 != *str2) {
                  return -1;
            }
            str1++;
            str2++;
      }

      return 0;
}


/*
 * 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 = '';
      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 offset;
      __u32 ret = 0x00;

      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;
      }
      /* Read a new block of FAT entries into the cache. */
      if (bufnum != mydata->fatbufnum) {
            int getsize = FATBUFSIZE/FS_BLOCK_SIZE;
            __u8 *bufptr = mydata->fatbuf;
            __u32 fatlength = mydata->fatlength;
            __u32 startblock = bufnum * FATBUFBLOCKS;
            unsigned long i;

            fatlength *= SECTOR_SIZE;     /* We want it in bytes now */
            startblock += mydata->fat_sect;     /* Offset from start of disk */

            if (getsize > fatlength) getsize = fatlength;
            if (disk_read(startblock, getsize, bufptr) < 0) {
                  FAT_DPRINT("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: {
            __u32 off16 = (offset*3)/4;
            __u16 val1, val2;

            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;
      }
      FAT_DPRINT("ret: %d, offset: %d\n", 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)
{
      int idx = 0;
      __u32 startsect;

      if (clustnum > 0) {
            startsect = mydata->data_begin + clustnum*mydata->clust_size;
      } else {
            startsect = mydata->rootdir_sect;
      }

      if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) {
            FAT_DPRINT("Error reading data\n");
            return -1;
      }
      if(size % FS_BLOCK_SIZE) {
            __u8 tmpbuf[FS_BLOCK_SIZE];
            idx= size/FS_BLOCK_SIZE;
            if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
                  FAT_DPRINT("Error reading data\n");
                  return -1;
            }
            buffer += idx*FS_BLOCK_SIZE;

            memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE);
            return 0;
      }

      return 0;
}


/*
 * Read at most 'maxsize' bytes from the file associated with 'dentptr'
 * into 'buffer'.
 * Return the number of bytes read or -1 on fatal errors.
 */
static long
get_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 * SECTOR_SIZE;
      __u32 curclust = START(dentptr);
      __u32 endclust, newclust;
      unsigned long actsize;

      FAT_DPRINT("Filesize: %ld bytes\n", filesize);

      if (maxsize > 0 && filesize > maxsize) filesize = maxsize;

      FAT_DPRINT("Reading: %ld bytes\n", filesize);

      actsize=bytesperclust;
      endclust=curclust;
      do {
            /* search for consecutive clusters */
            while(actsize < filesize) {
                  newclust = get_fatent(mydata, endclust);
                  if((newclust -1)!=endclust)
                        goto getit;
                  if (newclust <= 0x0001 || newclust >= 0xfff0) {
                        FAT_DPRINT("curclust: 0x%x\n", newclust);
                        FAT_DPRINT("Invalid FAT entry\n");
                        return gotsize;
                  }
                  endclust=newclust;
                  actsize+= bytesperclust;
            }
            /* actsize >= file size */
            actsize -= bytesperclust;
            /* get remaining clusters */
            if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
                  FAT_ERROR("Error reading cluster\n");
                  return -1;
            }
            /* get remaining bytes */
            gotsize += (int)actsize;
            filesize -= actsize;
            buffer += actsize;
            actsize= filesize;
            if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
                  FAT_ERROR("Error reading cluster\n");
                  return -1;
            }
            gotsize+=actsize;
            return gotsize;
getit:
            if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
                  FAT_ERROR("Error reading cluster\n");
                  return -1;
            }
            gotsize += (int)actsize;
            filesize -= actsize;
            buffer += actsize;
            curclust = get_fatent(mydata, endclust);
            if (curclust <= 0x0001 || curclust >= 0xfff0) {
                  FAT_DPRINT("curclust: 0x%x\n", curclust);
                  FAT_ERROR("Invalid FAT entry\n");
                  return gotsize;
            }
            actsize=bytesperclust;
            endclust=curclust;
      } while (1);
}


#ifdef CONFIG_SUPPORT_VFAT
/*
 * Extract the file name information from 'slotptr' into 'l_name',
 * starting at l_name[*idx].
 * 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;
}

/* Calculate short name checksum */
static __u8
mkcksum(const char *str, const char *ext)
{
      int i;
      __u8 ret = 0;

      for (i = 0; i < 8; i++)
                  ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i];
      for (i = 0; i < 3; i++)
                  ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + ext[i];

      return ret;
}
#endif


/*
 * Get the directory entry associated with 'filename' from the directory
 * starting at 'startsect'
 */


static dir_entry *get_dentfromdir (fsdata * mydata, int startsect,
                           char *filename, dir_entry * retdent,
                           int dols)
{

}

#if 0
__u8 get_dentfromdir_block[MAX_CLUSTSIZE];
static dir_entry *get_dentfromdir (fsdata * mydata, int startsect,
                           char *filename, dir_entry * retdent,
                           int dols)
{
    __u16 prevcksum = 0xffff;
    __u32 curclust = START (retdent);
    int files = 0, dirs = 0;

    while (1) {
      dir_entry *dentptr;
      int i;

      if (get_cluster (mydata, curclust, get_dentfromdir_block,
             mydata->clust_size * SECTOR_SIZE) != 0) {
          FAT_DPRINT ("Error: reading directory block\n");
          return NULL;
      }
      dentptr = (dir_entry *) get_dentfromdir_block;
      for (i = 0; i < DIRENTSPERCLUST; i++) {
          char s_name[14], l_name[256];

          l_name[0] = '\0';
          if (dentptr->name[0] == DELETED_FLAG) {
                dentptr++;
                continue;
          }
          if ((dentptr->attr & ATTR_VOLUME)) {
                /* Volume label or VFAT entry */
                dentptr++;
                continue;
          }
          if (dentptr->name[0] == 0) {
            if (dols) {
                printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
            }
            FAT_DPRINT ("Dentname == NULL - %d\n", i);
            return NULL;
          }
#ifdef CONFIG_SUPPORT_VFAT
          if (dols && mkcksum (dentptr->name) == prevcksum) {
            dentptr++;
            continue;
          }
#endif
          get_name (dentptr, s_name);
          if (dols) {
            int isdir = (dentptr->attr & ATTR_DIR);
            char dirc;
            int doit = 0;

            if (isdir) {
                dirs++;
                dirc = '/';
                doit = 1;
            } else {
                dirc = ' ';
                if (s_name[0] != 0) {
                  files++;
                  doit = 1;
                }
            }
            if (doit) {
                if (dirc == ' ') {
                  printf (" %8ld   %s%c\n",
                        (long) FAT2CPU32 (dentptr->size), s_name,
                        dirc);
                } else {
                  printf ("            %s%c\n", s_name, dirc);
                }
            }
            dentptr++;
            continue;
          }
          if (strcmp (filename, s_name) && strcmp (filename, l_name)) {
            FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name);
            dentptr++;
            continue;
          }
          memcpy (retdent, dentptr, sizeof (dir_entry));

          FAT_DPRINT ("DentName: %s", s_name);
          FAT_DPRINT (", start: 0x%x", START (dentptr));
          FAT_DPRINT (", size:  0x%x %s\n",
                  FAT2CPU32 (dentptr->size),
                  (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");

          return retdent;
      }
      curclust = get_fatent (mydata, curclust);
      if (curclust <= 0x0001 || curclust >= 0xfff0) {
          FAT_DPRINT ("curclust: 0x%x\n", curclust);
          FAT_ERROR ("Invalid FAT entry\n");
          return NULL;
      }
    }

    return NULL;
}
#endif


/*
 * Read boot sector and volume info from a FAT filesystem
 */
static int
read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
{
      __u8 block[FS_BLOCK_SIZE];
      volume_info *vistart;

      FAT_DPRINT("Reading boot sector\n");

      if (disk_read(0, 1, block) < 0) {
            FAT_DPRINT("Error: reading block\n");
            return -1;
      }

      memcpy(bs, block, sizeof(boot_sector));
      bs->reserved      = FAT2CPU16(bs->reserved);
      bs->fat_length    = FAT2CPU16(bs->fat_length);
      bs->secs_track    = FAT2CPU16(bs->secs_track);
      bs->heads   = FAT2CPU16(bs->heads);
#if 0 /* UNUSED */
      bs->hidden  = FAT2CPU32(bs->hidden);
#endif
      bs->total_sect    = FAT2CPU32(bs->total_sect);

      /* FAT32 entries */
      if (bs->fat_length == 0) {
            /* Assume FAT32 */
            bs->fat32_length = FAT2CPU32(bs->fat32_length);
            bs->flags    = FAT2CPU16(bs->flags);
            bs->root_cluster = FAT2CPU32(bs->root_cluster);
            bs->info_sector  = FAT2CPU16(bs->info_sector);
            bs->backup_boot  = FAT2CPU16(bs->backup_boot);
            vistart = (volume_info*) (block + sizeof(boot_sector));
            *fatsize = 32;
      } else {
            vistart = (volume_info*) &(bs->fat32_length);
            *fatsize = 0;
      }
      memcpy(volinfo, vistart, sizeof(volume_info));

      /* Terminate fs_type string. Writing past the end of vistart
         is ok - it's just the buffer. */
      vistart->fs_type[8] = '\0';

      if (*fatsize == 32) {
            if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) {
                  return 0;
            }
      } else {
            if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) {
                  *fatsize = 12;
                  return 0;
            }
            if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) {
                  *fatsize = 16;
                  return 0;
            }
      }

      FAT_DPRINT("Error: broken fs_type sign\n");
      return -1;
}

#if 0
__u8 do_fat_read_block[MAX_CLUSTSIZE];  /* Block buffer */
#endif

__u8 *fnamecopy = 0x80500000;
__u8 *do_fat_read_block = 0x80500880;

boot_sector bs;
volume_info volinfo;
fsdata datablock;

long
do_fat_read(const char *filename, void *buffer, unsigned long maxsize,
           int dols)
{
#if CONFIG_NIOS /* NIOS CPU cannot access big automatic arrays */
    static
#endif
    fsdata *mydata = &datablock;
    dir_entry *dentptr;
    __u16 prevcksum = 0xffff;
    char *subname = "";
    int rootdir_size, cursect;
    int idx, isdir = 0;
    int files = 0, dirs = 0;
    long ret = 0;
    int firsttime;

    if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) {
      printf ("Error: reading boot sector\n");
      return -1;
    }
    if (mydata->fatsize == 32) {
      mydata->fatlength = bs.fat32_length;
    } else {
      mydata->fatlength = bs.fat_length;
    }
    mydata->fat_sect = bs.reserved;
    cursect = mydata->rootdir_sect
          = mydata->fat_sect + mydata->fatlength * bs.fats;
    mydata->clust_size = bs.cluster_size;
    if (mydata->fatsize == 32) {
      rootdir_size = mydata->clust_size;
      mydata->data_begin = mydata->rootdir_sect   /* + rootdir_size */
            - (mydata->clust_size * 2);
    } else {
      rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0])
                  * sizeof (dir_entry)) / SECTOR_SIZE;
      mydata->data_begin = mydata->rootdir_sect + rootdir_size
            - (mydata->clust_size * 2);
    }
    mydata->fatbufnum = -1;

    FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize,
            mydata->fatlength);
    FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n"
            "Data begins at: %d\n",
            mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE,
            rootdir_size, mydata->data_begin);
    FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size);

    /* "cwd" is always the root... */
    while (ISDIRDELIM (*filename))
      filename++;
    /* Make a copy of the filename and convert it to lowercase */
    strcpy (fnamecopy, filename);
    downcase (fnamecopy);
    if (*fnamecopy == '\0') {
      if (!dols){
            printf("\n not there\n");
          return -1;
      }
      dols = LS_ROOT;
    } else if ((idx = dirdelim (fnamecopy)) >= 0) {
      isdir = 1;
      fnamecopy[idx] = '\0';
      subname = fnamecopy + idx + 1;
      /* Handle multiple delimiters */
      while (ISDIRDELIM (*subname))
          subname++;
    } else if (dols) {
      isdir = 1;
    }

    while (1) {
      int i;

      if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) {
          printf ("Error: reading rootdir block\n");
          return -1;
      }
      dentptr = (dir_entry *) do_fat_read_block;
      for (i = 0; i < DIRENTSPERBLOCK; i++) {
          char s_name[14], l_name[256];

          l_name[0] = '\0';
          if ((dentptr->attr & ATTR_VOLUME)) {
                /* Volume label or VFAT entry */
                dentptr++;
                continue;
          } else if (dentptr->name[0] == 0) {
            FAT_DPRINT ("RootDentname == NULL - %d\n", i);
            if (dols == LS_ROOT) {
                printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
                return 0;
            }
            return -1;
          }
#ifdef CONFIG_SUPPORT_VFAT
          else if (dols == LS_ROOT
                 && mkcksum(dentptr->name, dentptr->ext) == prevcksum) {
            dentptr++;
            continue;
          }
#endif
          get_name (dentptr, s_name);
          if (dols == LS_ROOT) {
            int isdir = (dentptr->attr & ATTR_DIR);
            char dirc;
            int doit = 0;

            if (isdir) {
                dirc = '/';
                if (s_name[0] != 0) {
                  dirs++;
                  doit = 1;
                }
            } else {
                dirc = ' ';
                if (s_name[0] != 0) {
                  files++;
                  doit = 1;
                }
            }
            if (doit) {
                if (dirc == ' ') {
                  printf (" %8ld   %s%c\n",
                        (long) FAT2CPU32 (dentptr->size), s_name,
                        dirc);
                } else {
                  printf ("            %s%c\n", s_name, dirc);
                }
            }
            dentptr++;
            continue;
          }
          if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) {
            FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name);
            dentptr++;
            continue;
          }
          if (isdir && !(dentptr->attr & ATTR_DIR))
            return -1;

          FAT_DPRINT ("RootName: %s", s_name);
          FAT_DPRINT (", start: 0x%x", START (dentptr));
          FAT_DPRINT (", size:  0x%x %s\n",
                  FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : "");

          goto rootdir_done;  /* We got a match */
      }
      cursect++;
    }
  rootdir_done:

    firsttime = 1;
    while (isdir) {
      int startsect = mydata->data_begin
            + START (dentptr) * mydata->clust_size;
      dir_entry dent;
      char *nextname = NULL;

      dent = *dentptr;
      dentptr = &dent;
      idx = dirdelim (subname);
      if (idx >= 0) {
          subname[idx] = '\0';
          nextname = subname + idx + 1;
          /* Handle multiple delimiters */
          while (ISDIRDELIM (*nextname))
            nextname++;
          if (dols && *nextname == '\0')
            firsttime = 0;
      } else {
          if (dols && firsttime) {
            firsttime = 0;
          } else {
            isdir = 0;
          }
      }

      if (get_dentfromdir (mydata, startsect, subname, dentptr,
                       isdir ? 0 : dols) == NULL) {
          if (dols && !isdir)
            return 0;
          return -1;
      }

      if (idx >= 0) {
          if (!(dentptr->attr & ATTR_DIR))
            return -1;
          subname = nextname;
      }
    }
    ret = get_contents (mydata, dentptr, buffer, maxsize);
    FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret);

    return ret;
}


int
file_fat_detectfs(void)
{
      boot_sector bs;
      volume_info volinfo;
      int         fatsize;
      char  vol_label[12];

      if(cur_dev==NULL) {
            printf("No current device\n");
            return 1;
      }
#if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) || \
    (CONFIG_COMMANDS & CFG_CMD_USB) || (CONFIG_MMC)
      printf("Interface:  ");
      switch(cur_dev->if_type) {
            case IF_TYPE_IDE :      printf("IDE"); break;
            case IF_TYPE_SCSI :     printf("SCSI"); break;
            case IF_TYPE_ATAPI :    printf("ATAPI"); break;
            case IF_TYPE_USB :      printf("USB"); break;
            case IF_TYPE_DOC :      printf("DOC"); break;
            case IF_TYPE_MMC :      printf("MMC"); break;
            default :         printf("Unknown");
      }
      printf("\n  Device %d: ",cur_dev->dev);
      dev_print(cur_dev);
#endif
      if(read_bootsectandvi(&bs, &volinfo, &fatsize)) {
            printf("\nNo valid FAT fs found\n");
            return 1;
      }
      memcpy (vol_label, volinfo.volume_label, 11);
      vol_label[11] = '\0';
      volinfo.fs_type[5]='\0';
      printf("Partition %d: Filesystem: %s \"%s\"\n",cur_part,volinfo.fs_type,vol_label);
      return 0;
}


int
file_fat_ls(const char *dir)
{
      return do_fat_read(dir, NULL, 0, LS_YES);
}


long
file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
{
      long ret;
      ret = do_fat_read(filename, buffer, maxsize, LS_NO);
      return ret;
}

#endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */

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