This is Petit FAT File System Module for mbed NXP LPC1768. The ported library from http://elm-chan.org/fsw/ff/00index_p.html made by Mr. ChaN. The connection is same as SDCard library here http://mbed.org/projects/cookbook/wiki/SDCard . If you need change a pin, You can find the definition at libpff/connect.h :)
Diff: libpff/pff.c
- Revision:
- 0:b5453be5ad07
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libpff/pff.c Tue Jun 01 12:23:29 2010 +0000 @@ -0,0 +1,840 @@ +/*----------------------------------------------------------------------------/ +/ 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 LD_DWORD(buf) & 0x0FFFFFFF; +#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 +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 */ +/*-----------------------------------------------------------------------*/ + +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 */ +