PokittoLib

Diff: libpff/pff.cpp

Revision:

51:113b1d84c34f

Parent:

50:ca94812a17b6

Child:

52:c04087025cab

--- a/libpff/pff.cpp	Wed Jun 27 13:14:54 2018 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,841 +0,0 @@
-/*----------------------------------------------------------------------------/
-/  Petit FatFs - FAT file system module  R0.02                 (C)ChaN, 2009
-/-----------------------------------------------------------------------------/
-/ Petit FatFs module is an open source software to implement FAT file system to
-/ small embedded systems. This is a free software and is opened for education,
-/ research and commercial developments under license policy of following trems.
-/
-/  Copyright (C) 2009, ChaN, all right reserved.
-/
-/ * The Petit FatFs module is a free software and there is NO WARRANTY.
-/ * No restriction on use. You can use, modify and redistribute it for
-/   personal, non-profit or commercial use UNDER YOUR RESPONSIBILITY.
-/ * Redistributions of source code must retain the above copyright notice.
-/
-/-----------------------------------------------------------------------------/
-/ Jun 15,'09  R0.01a  First release. (Branched from FatFs R0.07b.)
-/
-/ Dec 14,'09  R0.02   Added multiple code page support.
-/                     Added write funciton.
-/                     Changed stream read mode interface.
-/----------------------------------------------------------------------------*/
-
-#include "pff.h"        /* Petit FatFs configurations and declarations */
-#include "diskio.h"        /* Declarations of low level disk I/O functions */
-
-
-/*--------------------------------------------------------------------------
-
-   Private Functions
-
----------------------------------------------------------------------------*/
-
-static
-FATFS *FatFs;    /* Pointer to the file system object (logical drive) */
-
-
-
-/*-----------------------------------------------------------------------*/
-/* String functions                                                      */
-/*-----------------------------------------------------------------------*/
-
-/* Fill memory */
-static
-void mem_set (void* dst, int val, int cnt) {
-    char *d = (char*)dst;
-    while (cnt--) *d++ = (char)val;
-}
-
-/* Compare memory to memory */
-static
-int mem_cmp (const void* dst, const void* src, int cnt) {
-    const char *d = (const char *)dst, *s = (const char *)src;
-    int r = 0;
-    while (cnt-- && (r = *d++ - *s++) == 0) ;
-    return r;
-}
-
-
-
-/*-----------------------------------------------------------------------*/
-/* FAT access - Read value of a FAT entry                                */
-/*-----------------------------------------------------------------------*/
-
-static
-CLUST get_fat (    /* 1:IO error, Else:Cluster status */
-    CLUST clst    /* Cluster# to get the link information */
-) {
-    WORD wc, bc, ofs;
-    BYTE buf[4];
-    FATFS *fs = FatFs;
-
-
-    if (clst < 2 || clst >= fs->max_clust)    /* Range check */
-        return 1;
-
-    switch (fs->fs_type) {
-        case FS_FAT12 :
-            bc = (WORD)clst;
-            bc += bc / 2;
-            ofs = bc % 512;
-            bc /= 512;
-            if (ofs != 511) {
-                if (disk_readp(buf, fs->fatbase + bc, ofs, 2)) break;
-            } else {
-                if (disk_readp(buf, fs->fatbase + bc, 511, 1)) break;
-                if (disk_readp(buf+1, fs->fatbase + bc + 1, 0, 1)) break;
-            }
-            wc = LD_WORD(buf);
-            return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
-
-        case FS_FAT16 :
-            if (disk_readp(buf, fs->fatbase + clst / 256, (WORD)(((WORD)clst % 256) * 2), 2)) break;
-            return LD_WORD(buf);
-#if _FS_FAT32
-        case FS_FAT32 :
-            if (disk_readp(buf, fs->fatbase + clst / 128, (WORD)(((WORD)clst % 128) * 4), 4)) break;
-            return ((WORD)(((WORD)*(BYTE*)((buf)+1)<<8)|(WORD)*(BYTE*)(buf))) & 0x0FFFFFFF; //return LD_DWORD(buf) & 0x0FFFFFFF; //get rid of out of bounds warning in online IDE
-#endif
-    }
-
-    return 1;    /* An error occured at the disk I/O layer */
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Get sector# from cluster#                                             */
-/*-----------------------------------------------------------------------*/
-
-static
-DWORD clust2sect (    /* !=0: Sector number, 0: Failed - invalid cluster# */
-    CLUST clst        /* Cluster# to be converted */
-) {
-    FATFS *fs = FatFs;
-
-
-    clst -= 2;
-    if (clst >= (fs->max_clust - 2)) return 0;        /* Invalid cluster# */
-    return (DWORD)clst * fs->csize + fs->database;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Directory handling - Rewind directory index                           */
-/*-----------------------------------------------------------------------*/
-
-static
-FRESULT dir_rewind (
-    FATDIR *dj            /* Pointer to directory object */
-) {
-    CLUST clst;
-    FATFS *fs = FatFs;
-
-
-    dj->index = 0;
-    clst = dj->sclust;
-    if (clst == 1 || clst >= fs->max_clust)    /* Check start cluster range */
-        return FR_DISK_ERR;
-#if _FS_FAT32
-    if (!clst && fs->fs_type == FS_FAT32)    /* Replace cluster# 0 with root cluster# if in FAT32 */
-        clst = fs->dirbase;
-#endif
-    dj->clust = clst;                        /* Current cluster */
-    dj->sect = clst ? clust2sect(clst) : fs->dirbase;    /* Current sector */
-
-    return FR_OK;    /* Seek succeeded */
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Directory handling - Move directory index next                        */
-/*-----------------------------------------------------------------------*/
-
-static
-FRESULT dir_next (    /* FR_OK:Succeeded, FR_NO_FILE:End of table */
-    FATDIR *dj            /* Pointer to directory object */
-) {
-    CLUST clst;
-    WORD i;
-    FATFS *fs = FatFs;
-
-
-    i = dj->index + 1;
-    if (!i || !dj->sect)    /* Report EOT when index has reached 65535 */
-        return FR_NO_FILE;
-
-    if (!(i & (16-1))) {    /* Sector changed? */
-        dj->sect++;            /* Next sector */
-
-        if (dj->clust == 0) {    /* Static table */
-            if (i >= fs->n_rootdir)    /* Report EOT when end of table */
-                return FR_NO_FILE;
-        } else {                   /* Dynamic table */
-            if (((i / 16) & (fs->csize-1)) == 0) {    /* Cluster changed? */
-                clst = get_fat(dj->clust);        /* Get next cluster */
-                if (clst <= 1) return FR_DISK_ERR;
-                if (clst >= fs->max_clust)        /* When it reached end of dynamic table */
-                    return FR_NO_FILE;            /* Report EOT */
-                dj->clust = clst;                /* Initialize data for new cluster */
-                dj->sect = clust2sect(clst);
-            }
-        }
-    }
-
-    dj->index = i;
-
-    return FR_OK;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Directory handling - Find an object in the directory                  */
-/*-----------------------------------------------------------------------*/
-
-static
-FRESULT dir_find (
-    FATDIR *dj            /* Pointer to the directory object linked to the file name */
-) {
-    FRESULT res;
-    BYTE c, *dir;
-
-
-    res = dir_rewind(dj);            /* Rewind directory object */
-    if (res != FR_OK) return res;
-
-    dir = FatFs->buf;
-    do {
-        res = disk_readp(dir, dj->sect, (WORD)((dj->index % 16) * 32), 32)    /* Read an entry */
-              ? FR_DISK_ERR : FR_OK;
-        if (res != FR_OK) break;
-        c = dir[DIR_Name];    /* First character */
-        if (c == 0) {
-            res = FR_NO_FILE;    /* Reached to end of table */
-            break;
-        }
-        if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
-            break;
-        res = dir_next(dj);                            /* Next entry */
-    } while (res == FR_OK);
-
-    return res;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Read an object from the directory                                     */
-/*-----------------------------------------------------------------------*/
-#if _USE_DIR
-static
-FRESULT dir_read (
-    FATDIR *dj            /* Pointer to the directory object to store read object name */
-) {
-    FRESULT res;
-    BYTE a, c, *dir;
-
-
-    res = FR_NO_FILE;
-    dir = FatFs->buf;
-    while (dj->sect) {
-        res = disk_readp(dir, dj->sect, (WORD)((dj->index % 16) * 32), 32)    /* Read an entry */
-              ? FR_DISK_ERR : FR_OK;
-        if (res != FR_OK) break;
-        c = dir[DIR_Name];
-        if (c == 0) {
-            res = FR_NO_FILE;    /* Reached to end of table */
-            break;
-        }
-        a = dir[DIR_Attr] & AM_MASK;
-        if (c != 0xE5 && c != '.' && !(a & AM_VOL))    /* Is it a valid entry? */
-            break;
-        res = dir_next(dj);                /* Next entry */
-        if (res != FR_OK) break;
-    }
-
-    if (res != FR_OK) dj->sect = 0;
-
-    return res;
-}
-#endif
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Pick a segment and create the object name in directory form           */
-/*-----------------------------------------------------------------------*/
-
-#ifdef _EXCVT
-static const BYTE cvt[] = _EXCVT;
-#endif
-
-static
-FRESULT create_name (
-    FATDIR *dj,            /* Pointer to the directory object */
-    const char **path    /* Pointer to pointer to the segment in the path string */
-) {
-    BYTE c, d, ni, si, i, *sfn;
-    const char *p;
-
-    /* Create file name in directory form */
-    sfn = dj->fn;
-    mem_set(sfn, ' ', 11);
-    si = i = 0;
-    ni = 8;
-    p = *path;
-    for (;;) {
-        c = p[si++];
-        if (c <= ' ' || c == '/') break;    /* Break on end of segment */
-        if (c == '.' || i >= ni) {
-            if (ni != 8 || c != '.') break;
-            i = 8;
-            ni = 11;
-            continue;
-        }
-#ifdef _EXCVT
-        if (c >= 0x80)                    /* To upper extended char (SBCS) */
-            c = cvt[c - 0x80];
-#endif
-        if (IsDBCS1(c) && i >= ni - 1) {    /* DBC 1st byte? */
-            d = p[si++];                    /* Get 2nd byte */
-            sfn[i++] = c;
-            sfn[i++] = d;
-        } else {                        /* Single byte code */
-            if (IsLower(c)) c -= 0x20;    /* toupper */
-            sfn[i++] = c;
-        }
-    }
-    *path = &p[si];                        /* Rerurn pointer to the next segment */
-
-    sfn[11] = (c <= ' ') ? 1 : 0;        /* Set last segment flag if end of path */
-
-    return FR_OK;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Get file information from directory entry                             */
-/*-----------------------------------------------------------------------*/
-#if _USE_DIR
-static
-void get_fileinfo (        /* No return code */
-    FATDIR *dj,            /* Pointer to the directory object */
-    FILINFO *fno         /* Pointer to store the file information */
-) {
-    BYTE i, c, *dir;
-    char *p;
-
-
-    p = fno->fname;
-    if (dj->sect) {
-        dir = FatFs->buf;
-        for (i = 0; i < 8; i++) {    /* Copy file name body */
-            c = dir[i];
-            if (c == ' ') break;
-            if (c == 0x05) c = 0xE5;
-            *p++ = c;
-        }
-        if (dir[8] != ' ') {        /* Copy file name extension */
-            *p++ = '.';
-            for (i = 8; i < 11; i++) {
-                c = dir[i];
-                if (c == ' ') break;
-                *p++ = c;
-            }
-        }
-        fno->fattrib = dir[DIR_Attr];                /* Attribute */
-        fno->fsize = LD_DWORD(dir+DIR_FileSize);    /* Size */
-        fno->fdate = LD_WORD(dir+DIR_WrtDate);        /* Date */
-        fno->ftime = LD_WORD(dir+DIR_WrtTime);        /* Time */
-    }
-    *p = 0;
-}
-#endif /* _USE_DIR */
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Follow a file path                                                    */
-/*-----------------------------------------------------------------------*/
-
-static
-FRESULT follow_path (    /* FR_OK(0): successful, !=0: error code */
-    FATDIR *dj,            /* Directory object to return last directory and found object */
-    const char *path    /* Full-path string to find a file or directory */
-) {
-    FRESULT res;
-    BYTE *dir;
-
-
-    while (*path == ' ') path++;        /* Skip leading spaces */
-    if (*path == '/') path++;            /* Strip heading separator */
-    dj->sclust = 0;                        /* Set start directory (always root dir) */
-
-    if ((BYTE)*path <= ' ') {            /* Null path means the root directory */
-        res = dir_rewind(dj);
-        FatFs->buf[0] = 0;
-
-    } else {                            /* Follow path */
-        for (;;) {
-            res = create_name(dj, &path);    /* Get a segment */
-            if (res != FR_OK) break;
-            res = dir_find(dj);                /* Find it */
-            if (res != FR_OK) {                /* Could not find the object */
-                if (res == FR_NO_FILE && !*(dj->fn+11))
-                    res = FR_NO_PATH;
-                break;
-            }
-            if (*(dj->fn+11)) break;        /* Last segment match. Function completed. */
-            dir = FatFs->buf;                /* There is next segment. Follow the sub directory */
-            if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */
-                res = FR_NO_PATH;
-                break;
-            }
-            dj->sclust =
-#if _FS_FAT32
-                ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) |
-#endif
-                LD_WORD(dir+DIR_FstClusLO);
-        }
-    }
-
-    return res;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Check a sector if it is an FAT boot record                            */
-/*-----------------------------------------------------------------------*/
-
-static
-__attribute__((section(".SD_Code"))) BYTE check_fs (    /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */
-    BYTE *buf,    /* Working buffer */
-    DWORD sect    /* Sector# (lba) to check if it is an FAT boot record or not */
-) {
-    if (disk_readp(buf, sect, 510, 2))        /* Read the boot sector */
-        return 3;
-    if (LD_WORD(buf) != 0xAA55)                /* Check record signature */
-        return 2;
-
-    if (!disk_readp(buf, sect, BS_FilSysType, 2) && LD_WORD(buf) == 0x4146)    /* Check FAT12/16 */
-        return 0;
-#if _FS_FAT32
-    if (!disk_readp(buf, sect, BS_FilSysType32, 2) && LD_WORD(buf) == 0x4146)    /* Check FAT32 */
-        return 0;
-#endif
-    return 1;
-}
-
-
-
-
-/*--------------------------------------------------------------------------
-
-   Public Functions
-
---------------------------------------------------------------------------*/
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Mount/Unmount a Locical Drive                                         */
-/*-----------------------------------------------------------------------*/
-
-__attribute__((section(".SD_Code"))) FRESULT pf_mount (
-    FATFS *fs        /* Pointer to new file system object (NULL: Unmount) */
-) {
-    BYTE fmt, buf[36];
-    DWORD bsect, fsize, tsect, mclst;
-
-
-    FatFs = 0;
-    if (!fs) return FR_OK;                /* Unregister fs object */
-
-    if (disk_initialize() & STA_NOINIT)    /* Check if the drive is ready or not */
-        return FR_NOT_READY;
-
-    /* Search FAT partition on the drive */
-    bsect = 0;
-    fmt = check_fs(buf, bsect);            /* Check sector 0 as an SFD format */
-    if (fmt == 1) {                        /* Not an FAT boot record, it may be FDISK format */
-        /* Check a partition listed in top of the partition table */
-        if (disk_readp(buf, bsect, MBR_Table, 16)) {    /* 1st partition entry */
-            fmt = 3;
-        } else {
-            if (buf[4]) {                    /* Is the partition existing? */
-                bsect = LD_DWORD(&buf[8]);    /* Partition offset in LBA */
-                fmt = check_fs(buf, bsect);    /* Check the partition */
-            }
-        }
-    }
-    if (fmt == 3) return FR_DISK_ERR;
-    if (fmt) return FR_NO_FILESYSTEM;    /* No valid FAT patition is found */
-
-    /* Initialize the file system object */
-    if (disk_readp(buf, bsect, 13, sizeof(buf))) return FR_DISK_ERR;
-
-    fsize = LD_WORD(buf+BPB_FATSz16-13);                /* Number of sectors per FAT */
-    if (!fsize) fsize = LD_DWORD(buf+BPB_FATSz32-13);
-
-    fsize *= buf[BPB_NumFATs-13];                        /* Number of sectors in FAT area */
-    fs->fatbase = bsect + LD_WORD(buf+BPB_RsvdSecCnt-13); /* FAT start sector (lba) */
-    fs->csize = buf[BPB_SecPerClus-13];                    /* Number of sectors per cluster */
-    fs->n_rootdir = LD_WORD(buf+BPB_RootEntCnt-13);        /* Nmuber of root directory entries */
-    tsect = LD_WORD(buf+BPB_TotSec16-13);                /* Number of sectors on the file system */
-    if (!tsect) tsect = LD_DWORD(buf+BPB_TotSec32-13);
-    mclst = (tsect                        /* Last cluster# + 1 */
-             - LD_WORD(buf+BPB_RsvdSecCnt-13) - fsize - fs->n_rootdir / 16
-            ) / fs->csize + 2;
-    fs->max_clust = (CLUST)mclst;
-
-    fmt = FS_FAT12;                            /* Determine the FAT sub type */
-    if (mclst >= 0xFF7) fmt = FS_FAT16;        /* Number of clusters >= 0xFF5 */
-    if (mclst >= 0xFFF7)                    /* Number of clusters >= 0xFFF5 */
-#if _FS_FAT32
-        fmt = FS_FAT32;
-#else
-        return FR_NO_FILESYSTEM;
-#endif
-
-    fs->fs_type = fmt;        /* FAT sub-type */
-#if _FS_FAT32
-    if (fmt == FS_FAT32)
-        fs->dirbase = LD_DWORD(buf+(BPB_RootClus-13));    /* Root directory start cluster */
-    else
-#endif
-        fs->dirbase = fs->fatbase + fsize;                /* Root directory start sector (lba) */
-    fs->database = fs->fatbase + fsize + fs->n_rootdir / 16;    /* Data start sector (lba) */
-
-    fs->flag = 0;
-    FatFs = fs;
-
-    return FR_OK;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Open or Create a File                                                 */
-/*-----------------------------------------------------------------------*/
-
-FRESULT pf_open (
-    const char *path    /* Pointer to the file name */
-) {
-    FRESULT res;
-    FATDIR dj;
-    BYTE sp[12], dir[32];
-    FATFS *fs = FatFs;
-
-
-    if (!fs)                        /* Check file system */
-        return FR_NOT_ENABLED;
-
-    fs->flag = 0;
-    fs->buf = dir;
-    dj.fn = sp;
-    res = follow_path(&dj, path);    /* Follow the file path */
-    if (res != FR_OK) return res;    /* Follow failed */
-    if (!dir[0] || (dir[DIR_Attr] & AM_DIR))    /* It is a directory */
-        return FR_NO_FILE;
-
-    fs->org_clust =                        /* File start cluster */
-#if _FS_FAT32
-        ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) |
-#endif
-        LD_WORD(dir+DIR_FstClusLO);
-    fs->fsize = LD_DWORD(dir+DIR_FileSize);    /* File size */
-    fs->fptr = 0;                        /* File pointer */
-    fs->flag = FA_OPENED;
-
-    return FR_OK;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Read File                                                             */
-/*-----------------------------------------------------------------------*/
-#if _USE_READ
-
-FRESULT pf_read (
-    void* buff,        /* Pointer to the read buffer (NULL:Forward data to the stream)*/
-    WORD btr,        /* Number of bytes to read */
-    WORD* br        /* Pointer to number of bytes read */
-) {
-    DRESULT dr;
-    CLUST clst;
-    DWORD sect, remain;
-    BYTE *rbuff = (BYTE *)buff;
-    WORD rcnt;
-    FATFS *fs = FatFs;
-
-
-    *br = 0;
-    if (!fs) return FR_NOT_ENABLED;        /* Check file system */
-    if (!(fs->flag & FA_OPENED))        /* Check if opened */
-        return FR_NOT_OPENED;
-
-    remain = fs->fsize - fs->fptr;
-    if (btr > remain) btr = (WORD)remain;            /* Truncate btr by remaining bytes */
-
-    while (btr)    {                                    /* Repeat until all data transferred */
-        if ((fs->fptr % 512) == 0) {                /* On the sector boundary? */
-            if ((fs->fptr / 512 % fs->csize) == 0) {    /* On the cluster boundary? */
-                clst = (fs->fptr == 0) ?            /* On the top of the file? */
-                       fs->org_clust : get_fat(fs->curr_clust);
-                if (clst <= 1) goto fr_abort;
-                fs->curr_clust = clst;                /* Update current cluster */
-                fs->csect = 0;                        /* Reset sector offset in the cluster */
-            }
-            sect = clust2sect(fs->curr_clust);        /* Get current sector */
-            if (!sect) goto fr_abort;
-            fs->dsect = sect + fs->csect++;
-        }
-        rcnt = 512 - ((WORD)fs->fptr % 512);        /* Get partial sector data from sector buffer */
-        if (rcnt > btr) rcnt = btr;
-        dr = disk_readp(!buff ? 0 : rbuff, fs->dsect, (WORD)(fs->fptr % 512), rcnt);
-        if (dr) goto fr_abort;
-        fs->fptr += rcnt;
-        rbuff += rcnt;            /* Update pointers and counters */
-        btr -= rcnt;
-        *br += rcnt;
-    }
-
-    return FR_OK;
-
-fr_abort:
-    fs->flag = 0;
-    return FR_DISK_ERR;
-}
-#endif
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Write File                                                            */
-/*-----------------------------------------------------------------------*/
-#if _USE_WRITE
-
-FRESULT pf_write (
-    const void* buff,    /* Pointer to the data to be written */
-    WORD btw,            /* Number of bytes to write (0:Finalize the current write operation) */
-    WORD* bw            /* Pointer to number of bytes written */
-) {
-    CLUST clst;
-    DWORD sect, remain;
-    const BYTE *p = (const BYTE *)buff;
-    WORD wcnt;
-    FATFS *fs = FatFs;
-
-
-    *bw = 0;
-    if (!fs) return FR_NOT_ENABLED;        /* Check file system */
-    if (!(fs->flag & FA_OPENED))        /* Check if opened */
-        return FR_NOT_OPENED;
-
-    if (!btw) {        /* Finalize request */
-        if ((fs->flag & FA__WIP) && disk_writep(0, 0)) goto fw_abort;
-        fs->flag &= ~FA__WIP;
-        return FR_OK;
-    } else {        /* Write data request */
-        if (!(fs->flag & FA__WIP))        /* Round down fptr to the sector boundary */
-            fs->fptr &= 0xFFFFFE00;
-    }
-    remain = fs->fsize - fs->fptr;
-    if (btw > remain) btw = (WORD)remain;            /* Truncate btw by remaining bytes */
-
-    while (btw)    {                                    /* Repeat until all data transferred */
-        if (((WORD)fs->fptr % 512) == 0) {                /* On the sector boundary? */
-            if ((fs->fptr / 512 % fs->csize) == 0) {    /* On the cluster boundary? */
-                clst = (fs->fptr == 0) ?            /* On the top of the file? */
-                       fs->org_clust : get_fat(fs->curr_clust);
-                if (clst <= 1) goto fw_abort;
-                fs->curr_clust = clst;                /* Update current cluster */
-                fs->csect = 0;                        /* Reset sector offset in the cluster */
-            }
-            sect = clust2sect(fs->curr_clust);        /* Get current sector */
-            if (!sect) goto fw_abort;
-            fs->dsect = sect + fs->csect++;
-            if (disk_writep(0, fs->dsect)) goto fw_abort;    /* Initiate a sector write operation */
-            fs->flag |= FA__WIP;
-        }
-        wcnt = 512 - ((WORD)fs->fptr % 512);        /* Number of bytes to write to the sector */
-        if (wcnt > btw) wcnt = btw;
-        if (disk_writep(p, wcnt)) goto fw_abort;    /* Send data to the sector */
-        fs->fptr += wcnt;
-        p += wcnt;                /* Update pointers and counters */
-        btw -= wcnt;
-        *bw += wcnt;
-        if (((WORD)fs->fptr % 512) == 0) {
-            if (disk_writep(0, 0)) goto fw_abort;    /* Finalize the currtent secter write operation */
-            fs->flag &= ~FA__WIP;
-        }
-    }
-
-    return FR_OK;
-
-fw_abort:
-    fs->flag = 0;
-    return FR_DISK_ERR;
-}
-#endif
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Seek File R/W Pointer                                                 */
-/*-----------------------------------------------------------------------*/
-#if _USE_LSEEK
-
-FRESULT pf_lseek (
-    DWORD ofs        /* File pointer from top of file */
-) {
-    CLUST clst;
-    DWORD bcs, sect, ifptr;
-    FATFS *fs = FatFs;
-
-
-    if (!fs) return FR_NOT_ENABLED;        /* Check file system */
-    if (!(fs->flag & FA_OPENED))        /* Check if opened */
-        return FR_NOT_OPENED;
-
-    if (ofs > fs->fsize) ofs = fs->fsize;    /* Clip offset with the file size */
-    ifptr = fs->fptr;
-    fs->fptr = 0;
-    if (ofs > 0) {
-        bcs = (DWORD)fs->csize * 512;    /* Cluster size (byte) */
-        if (ifptr > 0 &&
-                (ofs - 1) / bcs >= (ifptr - 1) / bcs) {    /* When seek to same or following cluster, */
-            fs->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
-            ofs -= fs->fptr;
-            clst = fs->curr_clust;
-        } else {                            /* When seek to back cluster, */
-            clst = fs->org_clust;            /* start from the first cluster */
-            fs->curr_clust = clst;
-        }
-        while (ofs > bcs) {                /* Cluster following loop */
-            clst = get_fat(clst);        /* Follow cluster chain */
-            if (clst <= 1 || clst >= fs->max_clust) goto fe_abort;
-            fs->curr_clust = clst;
-            fs->fptr += bcs;
-            ofs -= bcs;
-        }
-        fs->fptr += ofs;
-        sect = clust2sect(clst);        /* Current sector */
-        if (!sect) goto fe_abort;
-        fs->csect = (BYTE)(ofs / 512);    /* Sector offset in the cluster */
-        if (ofs % 512)
-            fs->dsect = sect + fs->csect++;
-    }
-
-    return FR_OK;
-
-fe_abort:
-    fs->flag = 0;
-    return FR_DISK_ERR;
-}
-#endif
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Create a Directroy Object                                             */
-/*-----------------------------------------------------------------------*/
-#if _USE_DIR
-
-FRESULT pf_opendir (
-    FATDIR *dj,            /* Pointer to directory object to create */
-    const char *path    /* Pointer to the directory path */
-) {
-    FRESULT res;
-    BYTE sp[12], dir[32];
-    FATFS *fs = FatFs;
-
-
-    if (!fs) {                /* Check file system */
-        res = FR_NOT_ENABLED;
-    } else {
-        fs->buf = dir;
-        dj->fn = sp;
-        res = follow_path(dj, path);            /* Follow the path to the directory */
-        if (res == FR_OK) {                        /* Follow completed */
-            if (dir[0]) {                        /* It is not the root dir */
-                if (dir[DIR_Attr] & AM_DIR) {    /* The object is a directory */
-                    dj->sclust =
-#if _FS_FAT32
-                        ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) |
-#endif
-                        LD_WORD(dir+DIR_FstClusLO);
-                } else {                        /* The object is not a directory */
-                    res = FR_NO_PATH;
-                }
-            }
-            if (res == FR_OK)
-                res = dir_rewind(dj);            /* Rewind dir */
-        }
-        if (res == FR_NO_FILE) res = FR_NO_PATH;
-    }
-
-    return res;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Read Directory Entry in Sequense                                      */
-/*-----------------------------------------------------------------------*/
-
-FRESULT pf_readdir (
-    FATDIR *dj,            /* Pointer to the open directory object */
-    FILINFO *fno        /* Pointer to file information to return */
-) {
-    FRESULT res;
-    BYTE sp[12], dir[32];
-    FATFS *fs = FatFs;
-
-
-    if (!fs) {                /* Check file system */
-        res = FR_NOT_ENABLED;
-    } else {
-        fs->buf = dir;
-        dj->fn = sp;
-        if (!fno) {
-            res = dir_rewind(dj);
-        } else {
-            res = dir_read(dj);
-            if (res == FR_NO_FILE) {
-                dj->sect = 0;
-                res = FR_OK;
-            }
-            if (res == FR_OK) {                /* A valid entry is found */
-                get_fileinfo(dj, fno);        /* Get the object information */
-                res = dir_next(dj);            /* Increment index for next */
-                if (res == FR_NO_FILE) {
-                    dj->sect = 0;
-                    res = FR_OK;
-                }
-            }
-        }
-    }
-
-    return res;
-}
-
-#endif /* _USE_DIR */
-
-