Murat Kilivan / FATFileSystem

FAT file system

Dependents:   S25FL216K_FATFileSystem SDFileSystem

FATFileSystem.cpp@0:b864b021fc6d, 2014-12-23 (annotated)

Committer:
mkilivan
Date:
Tue Dec 23 21:37:54 2014 +0000
Revision:
0:b864b021fc6d
initial commit

Who changed what in which revision?

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mkilivan 0:b864b021fc6d 1 /* mbed Microcontroller Library
mkilivan 0:b864b021fc6d 2 * Copyright (c) 2006-2012 ARM Limited
mkilivan 0:b864b021fc6d 3 *
mkilivan 0:b864b021fc6d 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mkilivan 0:b864b021fc6d 5 * of this software and associated documentation files (the "Software"), to deal
mkilivan 0:b864b021fc6d 6 * in the Software without restriction, including without limitation the rights
mkilivan 0:b864b021fc6d 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mkilivan 0:b864b021fc6d 8 * copies of the Software, and to permit persons to whom the Software is
mkilivan 0:b864b021fc6d 9 * furnished to do so, subject to the following conditions:
mkilivan 0:b864b021fc6d 10 *
mkilivan 0:b864b021fc6d 11 * The above copyright notice and this permission notice shall be included in
mkilivan 0:b864b021fc6d 12 * all copies or substantial portions of the Software.
mkilivan 0:b864b021fc6d 13 *
mkilivan 0:b864b021fc6d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mkilivan 0:b864b021fc6d 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mkilivan 0:b864b021fc6d 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mkilivan 0:b864b021fc6d 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mkilivan 0:b864b021fc6d 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mkilivan 0:b864b021fc6d 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mkilivan 0:b864b021fc6d 20 * SOFTWARE.
mkilivan 0:b864b021fc6d 21 */
mkilivan 0:b864b021fc6d 22 #include "mbed.h"
mkilivan 0:b864b021fc6d 23
mkilivan 0:b864b021fc6d 24 #include "ffconf.h"
mkilivan 0:b864b021fc6d 25 #include "mbed_debug.h"
mkilivan 0:b864b021fc6d 26
mkilivan 0:b864b021fc6d 27 #include "FATFileSystem.h"
mkilivan 0:b864b021fc6d 28 #include "FATFileHandle.h"
mkilivan 0:b864b021fc6d 29 #include "FATDirHandle.h"
mkilivan 0:b864b021fc6d 30
mkilivan 0:b864b021fc6d 31 DWORD get_fattime(void) {
mkilivan 0:b864b021fc6d 32 time_t rawtime;
mkilivan 0:b864b021fc6d 33 time(&rawtime);
mkilivan 0:b864b021fc6d 34 struct tm *ptm = localtime(&rawtime);
mkilivan 0:b864b021fc6d 35 return (DWORD)(ptm->tm_year - 80) << 25
mkilivan 0:b864b021fc6d 36 | (DWORD)(ptm->tm_mon + 1 ) << 21
mkilivan 0:b864b021fc6d 37 | (DWORD)(ptm->tm_mday ) << 16
mkilivan 0:b864b021fc6d 38 | (DWORD)(ptm->tm_hour ) << 11
mkilivan 0:b864b021fc6d 39 | (DWORD)(ptm->tm_min ) << 5
mkilivan 0:b864b021fc6d 40 | (DWORD)(ptm->tm_sec/2 );
mkilivan 0:b864b021fc6d 41 }
mkilivan 0:b864b021fc6d 42
mkilivan 0:b864b021fc6d 43 FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
mkilivan 0:b864b021fc6d 44
mkilivan 0:b864b021fc6d 45 FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
mkilivan 0:b864b021fc6d 46 debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
mkilivan 0:b864b021fc6d 47 for(int i=0; i<_VOLUMES; i++) {
mkilivan 0:b864b021fc6d 48 if(_ffs[i] == 0) {
mkilivan 0:b864b021fc6d 49 _ffs[i] = this;
mkilivan 0:b864b021fc6d 50 _fsid = i;
mkilivan 0:b864b021fc6d 51 debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%d]\n", _name, _fsid);
mkilivan 0:b864b021fc6d 52 f_mount(i, &_fs);
mkilivan 0:b864b021fc6d 53 return;
mkilivan 0:b864b021fc6d 54 }
mkilivan 0:b864b021fc6d 55 }
mkilivan 0:b864b021fc6d 56 error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
mkilivan 0:b864b021fc6d 57 }
mkilivan 0:b864b021fc6d 58
mkilivan 0:b864b021fc6d 59 FATFileSystem::~FATFileSystem() {
mkilivan 0:b864b021fc6d 60 for (int i=0; i<_VOLUMES; i++) {
mkilivan 0:b864b021fc6d 61 if (_ffs[i] == this) {
mkilivan 0:b864b021fc6d 62 _ffs[i] = 0;
mkilivan 0:b864b021fc6d 63 f_mount(i, NULL);
mkilivan 0:b864b021fc6d 64 }
mkilivan 0:b864b021fc6d 65 }
mkilivan 0:b864b021fc6d 66 }
mkilivan 0:b864b021fc6d 67
mkilivan 0:b864b021fc6d 68 FileHandle *FATFileSystem::open(const char* name, int flags) {
mkilivan 0:b864b021fc6d 69 debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%d]\n", name, _name, _fsid);
mkilivan 0:b864b021fc6d 70 char n[64];
mkilivan 0:b864b021fc6d 71 sprintf(n, "%d:/%s", _fsid, name);
mkilivan 0:b864b021fc6d 72
mkilivan 0:b864b021fc6d 73 /* POSIX flags -> FatFS open mode */
mkilivan 0:b864b021fc6d 74 BYTE openmode;
mkilivan 0:b864b021fc6d 75 if (flags & O_RDWR) {
mkilivan 0:b864b021fc6d 76 openmode = FA_READ|FA_WRITE;
mkilivan 0:b864b021fc6d 77 } else if(flags & O_WRONLY) {
mkilivan 0:b864b021fc6d 78 openmode = FA_WRITE;
mkilivan 0:b864b021fc6d 79 } else {
mkilivan 0:b864b021fc6d 80 openmode = FA_READ;
mkilivan 0:b864b021fc6d 81 }
mkilivan 0:b864b021fc6d 82 if(flags & O_CREAT) {
mkilivan 0:b864b021fc6d 83 if(flags & O_TRUNC) {
mkilivan 0:b864b021fc6d 84 openmode |= FA_CREATE_ALWAYS;
mkilivan 0:b864b021fc6d 85 } else {
mkilivan 0:b864b021fc6d 86 openmode |= FA_OPEN_ALWAYS;
mkilivan 0:b864b021fc6d 87 }
mkilivan 0:b864b021fc6d 88 }
mkilivan 0:b864b021fc6d 89
mkilivan 0:b864b021fc6d 90 FIL fh;
mkilivan 0:b864b021fc6d 91 FRESULT res = f_open(&fh, n, openmode);
mkilivan 0:b864b021fc6d 92 if (res) {
mkilivan 0:b864b021fc6d 93 debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
mkilivan 0:b864b021fc6d 94 return NULL;
mkilivan 0:b864b021fc6d 95 }
mkilivan 0:b864b021fc6d 96 if (flags & O_APPEND) {
mkilivan 0:b864b021fc6d 97 f_lseek(&fh, fh.fsize);
mkilivan 0:b864b021fc6d 98 }
mkilivan 0:b864b021fc6d 99 return new FATFileHandle(fh);
mkilivan 0:b864b021fc6d 100 }
mkilivan 0:b864b021fc6d 101
mkilivan 0:b864b021fc6d 102 int FATFileSystem::remove(const char *filename) {
mkilivan 0:b864b021fc6d 103 FRESULT res = f_unlink(filename);
mkilivan 0:b864b021fc6d 104 if (res) {
mkilivan 0:b864b021fc6d 105 debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
mkilivan 0:b864b021fc6d 106 return -1;
mkilivan 0:b864b021fc6d 107 }
mkilivan 0:b864b021fc6d 108 return 0;
mkilivan 0:b864b021fc6d 109 }
mkilivan 0:b864b021fc6d 110
mkilivan 0:b864b021fc6d 111 int FATFileSystem::format() {
mkilivan 0:b864b021fc6d 112 FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
mkilivan 0:b864b021fc6d 113 if (res) {
mkilivan 0:b864b021fc6d 114 debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
mkilivan 0:b864b021fc6d 115 return -1;
mkilivan 0:b864b021fc6d 116 }
mkilivan 0:b864b021fc6d 117 return 0;
mkilivan 0:b864b021fc6d 118 }
mkilivan 0:b864b021fc6d 119
mkilivan 0:b864b021fc6d 120 DirHandle *FATFileSystem::opendir(const char *name) {
mkilivan 0:b864b021fc6d 121 FATFS_DIR dir;
mkilivan 0:b864b021fc6d 122 FRESULT res = f_opendir(&dir, name);
mkilivan 0:b864b021fc6d 123 if (res != 0) {
mkilivan 0:b864b021fc6d 124 return NULL;
mkilivan 0:b864b021fc6d 125 }
mkilivan 0:b864b021fc6d 126 return new FATDirHandle(dir);
mkilivan 0:b864b021fc6d 127 }
mkilivan 0:b864b021fc6d 128
mkilivan 0:b864b021fc6d 129 int FATFileSystem::mkdir(const char *name, mode_t mode) {
mkilivan 0:b864b021fc6d 130 FRESULT res = f_mkdir(name);
mkilivan 0:b864b021fc6d 131 return res == 0 ? 0 : -1;
mkilivan 0:b864b021fc6d 132 }