diff options
author | Dean Camera <dean@fourwalledcubicle.com> | 2010-05-08 03:12:14 +0000 |
---|---|---|
committer | Dean Camera <dean@fourwalledcubicle.com> | 2010-05-08 03:12:14 +0000 |
commit | 071e02c6b6b4837fa9cf0b6d4c749994e02638d7 (patch) | |
tree | 960446788703b69f0bb285450be80c5b3d8cc22c /Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c | |
parent | e331b531c6e6d93eb0eee42b9002074e8090ad18 (diff) | |
download | lufa-071e02c6b6b4837fa9cf0b6d4c749994e02638d7.tar.gz lufa-071e02c6b6b4837fa9cf0b6d4c749994e02638d7.tar.bz2 lufa-071e02c6b6b4837fa9cf0b6d4c749994e02638d7.zip |
Add svn:eol-style property to source files, so that the line endings are correctly converted to the target system's native end of line style.
Diffstat (limited to 'Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c')
-rw-r--r-- | Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c | 1554 |
1 files changed, 777 insertions, 777 deletions
diff --git a/Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c b/Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c index 54c1d2406..b7b7fb8cb 100644 --- a/Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c +++ b/Projects/Incomplete/StandaloneProgrammer/Lib/PetiteFATFs/pff.c @@ -1,777 +1,777 @@ -/*----------------------------------------------------------------------------/
-/ Petit FatFs - FAT file system module R0.01a (C)ChaN, 2010
-/-----------------------------------------------------------------------------/
-/ 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) 2010, 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 Branched from FatFs R0.07b
-/----------------------------------------------------------------------------*/
-
-#include "pff.h" /* Petit FatFs configurations and declarations */
-#include "diskio.h" /* Declarations of low level disk I/O functions */
-
-
-/*--------------------------------------------------------------------------
-
- Private Work Area
-
----------------------------------------------------------------------------*/
-
-static
-FATFS *FatFs; /* Pointer to the file system object (logical drive) */
-
-
-/*--------------------------------------------------------------------------
-
- Private Functions
-
----------------------------------------------------------------------------*/
-
-
-/*-----------------------------------------------------------------------*/
-/* 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;
-}
-
-/* Check if chr is contained in the string */
-static
-int chk_chr (const char* str, int chr) {
- while (*str && *str != chr) str++;
- return *str;
-}
-
-
-
-/*-----------------------------------------------------------------------*/
-/* 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 (
- DIR *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, FR_DENIED:EOT and could not streach */
- DIR *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 (
- DIR *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; break; } /* Reached to end of table */
- 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 (
- DIR *dj /* Pointer to the directory object to store read object name */
-)
-{
- FRESULT res;
- BYTE a, c, *dir;
-
-
- res = FR_NO_FILE;
- while (dj->sect) {
- dir = FatFs->buf;
- 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; break; } /* Reached to end of table */
- 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 */
-/*-----------------------------------------------------------------------*/
-
-
-static
-FRESULT create_name (
- DIR *dj, /* Pointer to the directory object */
- const char **path /* Pointer to pointer to the segment in the path string */
-)
-{
- BYTE c, 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 != '.') return FR_INVALID_NAME;
- i = 8; ni = 11;
- continue;
- }
- if (c >= 0x7F || chk_chr(" +,;[=\\]\"*:<>\?|", c)) /* Reject unallowable chrs for SFN */
- return FR_INVALID_NAME;
- if (c >='a' && c <= 'z') c -= 0x20;
- sfn[i++] = c;
- }
- if (!i) return FR_INVALID_NAME; /* Reject null string */
- *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 */
- DIR *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 */
- DIR *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;
-
-
- 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;
- DIR 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_READ;
-
- return FR_OK;
-}
-
-
-
-
-/*-----------------------------------------------------------------------*/
-/* Read File */
-/*-----------------------------------------------------------------------*/
-
-FRESULT pf_read (
- void* dest, /* Pointer to the destination object */
- WORD btr, /* Number of bytes to read (bit15:destination) */
- WORD* br /* Pointer to number of bytes read */
-)
-{
- DRESULT dr;
- CLUST clst;
- DWORD sect, remain;
- WORD rcnt;
- BYTE *rbuff = dest;
- FATFS *fs = FatFs;
-
-
- *br = 0;
- if (!fs) return FR_NOT_ENABLED; /* Check file system */
- if (!(fs->flag & FA_READ))
- return FR_INVALID_OBJECT;
-
- remain = fs->fsize - fs->fptr;
- if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */
-
- for ( ; btr; /* Repeat until all data transferred */
- rbuff += rcnt, fs->fptr += rcnt, *br += rcnt, btr -= rcnt) {
- 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) {
- fs->flag = 0; return FR_DISK_ERR;
- }
- 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) {
- fs->flag = 0; return FR_DISK_ERR;
- }
- sect += fs->csect;
- fs->dsect = sect;
- fs->csect++; /* Next sector address in the cluster */
- }
- rcnt = 512 - ((WORD)fs->fptr % 512); /* Get partial sector data from sector buffer */
- if (rcnt > btr) rcnt = btr;
- if (fs->flag & FA_STREAM) {
- dr = disk_readp(dest, fs->dsect, (WORD)(fs->fptr % 512), (WORD)(rcnt | 0x8000));
- } else {
- dr = disk_readp(rbuff, fs->dsect, (WORD)(fs->fptr % 512), rcnt);
- }
- if (dr) {
- fs->flag = 0;
- return (dr == RES_STRERR) ? FR_STREAM_ERR : FR_DISK_ERR;
- }
- }
-
- return FR_OK;
-}
-
-
-
-
-#if _USE_LSEEK
-/*-----------------------------------------------------------------------*/
-/* Seek File R/W Pointer */
-/*-----------------------------------------------------------------------*/
-
-FRESULT pf_lseek (
- DWORD ofs /* File pointer from top of file */
-)
-{
- CLUST clst;
- DWORD bcs, nsect, ifptr;
- FATFS *fs = FatFs;
-
-
- if (!fs) return FR_NOT_ENABLED; /* Check file system */
- if (!(fs->flag & FA_READ))
- return FR_INVALID_OBJECT;
-
- 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 not in write mode */
- if (clst <= 1 || clst >= fs->max_clust) {
- fs->flag = 0; return FR_DISK_ERR;
- }
- fs->curr_clust = clst;
- fs->fptr += bcs;
- ofs -= bcs;
- }
- fs->fptr += ofs;
- fs->csect = (BYTE)(ofs / 512) + 1; /* Sector offset in the cluster */
- nsect = clust2sect(clst); /* Current sector */
- if (!nsect) {
- fs->flag = 0; return FR_DISK_ERR;
- }
- fs->dsect = nsect + fs->csect - 1;
- }
-
- return FR_OK;
-}
-#endif
-
-
-#if _USE_DIR
-/*-----------------------------------------------------------------------*/
-/* Create a Directroy Object */
-/*-----------------------------------------------------------------------*/
-
-FRESULT pf_opendir (
- DIR *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 (
- DIR *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 /* _FS_DIR */
-
+/*----------------------------------------------------------------------------/ +/ Petit FatFs - FAT file system module R0.01a (C)ChaN, 2010 +/-----------------------------------------------------------------------------/ +/ 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) 2010, 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 Branched from FatFs R0.07b +/----------------------------------------------------------------------------*/ + +#include "pff.h" /* Petit FatFs configurations and declarations */ +#include "diskio.h" /* Declarations of low level disk I/O functions */ + + +/*-------------------------------------------------------------------------- + + Private Work Area + +---------------------------------------------------------------------------*/ + +static +FATFS *FatFs; /* Pointer to the file system object (logical drive) */ + + +/*-------------------------------------------------------------------------- + + Private Functions + +---------------------------------------------------------------------------*/ + + +/*-----------------------------------------------------------------------*/ +/* 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; +} + +/* Check if chr is contained in the string */ +static +int chk_chr (const char* str, int chr) { + while (*str && *str != chr) str++; + return *str; +} + + + +/*-----------------------------------------------------------------------*/ +/* 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 ( + DIR *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, FR_DENIED:EOT and could not streach */ + DIR *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 ( + DIR *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; break; } /* Reached to end of table */ + 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 ( + DIR *dj /* Pointer to the directory object to store read object name */ +) +{ + FRESULT res; + BYTE a, c, *dir; + + + res = FR_NO_FILE; + while (dj->sect) { + dir = FatFs->buf; + 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; break; } /* Reached to end of table */ + 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 */ +/*-----------------------------------------------------------------------*/ + + +static +FRESULT create_name ( + DIR *dj, /* Pointer to the directory object */ + const char **path /* Pointer to pointer to the segment in the path string */ +) +{ + BYTE c, 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 != '.') return FR_INVALID_NAME; + i = 8; ni = 11; + continue; + } + if (c >= 0x7F || chk_chr(" +,;[=\\]\"*:<>\?|", c)) /* Reject unallowable chrs for SFN */ + return FR_INVALID_NAME; + if (c >='a' && c <= 'z') c -= 0x20; + sfn[i++] = c; + } + if (!i) return FR_INVALID_NAME; /* Reject null string */ + *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 */ + DIR *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 */ + DIR *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; + + + 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; + DIR 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_READ; + + return FR_OK; +} + + + + +/*-----------------------------------------------------------------------*/ +/* Read File */ +/*-----------------------------------------------------------------------*/ + +FRESULT pf_read ( + void* dest, /* Pointer to the destination object */ + WORD btr, /* Number of bytes to read (bit15:destination) */ + WORD* br /* Pointer to number of bytes read */ +) +{ + DRESULT dr; + CLUST clst; + DWORD sect, remain; + WORD rcnt; + BYTE *rbuff = dest; + FATFS *fs = FatFs; + + + *br = 0; + if (!fs) return FR_NOT_ENABLED; /* Check file system */ + if (!(fs->flag & FA_READ)) + return FR_INVALID_OBJECT; + + remain = fs->fsize - fs->fptr; + if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */ + + for ( ; btr; /* Repeat until all data transferred */ + rbuff += rcnt, fs->fptr += rcnt, *br += rcnt, btr -= rcnt) { + 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) { + fs->flag = 0; return FR_DISK_ERR; + } + 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) { + fs->flag = 0; return FR_DISK_ERR; + } + sect += fs->csect; + fs->dsect = sect; + fs->csect++; /* Next sector address in the cluster */ + } + rcnt = 512 - ((WORD)fs->fptr % 512); /* Get partial sector data from sector buffer */ + if (rcnt > btr) rcnt = btr; + if (fs->flag & FA_STREAM) { + dr = disk_readp(dest, fs->dsect, (WORD)(fs->fptr % 512), (WORD)(rcnt | 0x8000)); + } else { + dr = disk_readp(rbuff, fs->dsect, (WORD)(fs->fptr % 512), rcnt); + } + if (dr) { + fs->flag = 0; + return (dr == RES_STRERR) ? FR_STREAM_ERR : FR_DISK_ERR; + } + } + + return FR_OK; +} + + + + +#if _USE_LSEEK +/*-----------------------------------------------------------------------*/ +/* Seek File R/W Pointer */ +/*-----------------------------------------------------------------------*/ + +FRESULT pf_lseek ( + DWORD ofs /* File pointer from top of file */ +) +{ + CLUST clst; + DWORD bcs, nsect, ifptr; + FATFS *fs = FatFs; + + + if (!fs) return FR_NOT_ENABLED; /* Check file system */ + if (!(fs->flag & FA_READ)) + return FR_INVALID_OBJECT; + + 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 not in write mode */ + if (clst <= 1 || clst >= fs->max_clust) { + fs->flag = 0; return FR_DISK_ERR; + } + fs->curr_clust = clst; + fs->fptr += bcs; + ofs -= bcs; + } + fs->fptr += ofs; + fs->csect = (BYTE)(ofs / 512) + 1; /* Sector offset in the cluster */ + nsect = clust2sect(clst); /* Current sector */ + if (!nsect) { + fs->flag = 0; return FR_DISK_ERR; + } + fs->dsect = nsect + fs->csect - 1; + } + + return FR_OK; +} +#endif + + +#if _USE_DIR +/*-----------------------------------------------------------------------*/ +/* Create a Directroy Object */ +/*-----------------------------------------------------------------------*/ + +FRESULT pf_opendir ( + DIR *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 ( + DIR *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 /* _FS_DIR */ + |