tool/mbed/mbed-sdk/libraries/fs/fat/FATFileSystem.cpp

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2012 ARM Limited
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22 #include "mbed.h"
  23
  24 #include "ffconf.h"
  25 #include "mbed_debug.h"
  26
  27 #include "FATFileSystem.h"
  28 #include "FATFileHandle.h"
  29 #include "FATDirHandle.h"
  30
  31 DWORD get_fattime(void) {
  32     time_t rawtime;
  33     time(&rawtime);
  34     struct tm *ptm = localtime(&rawtime);
  35     return (DWORD)(ptm->tm_year - 80) << 25
  36          | (DWORD)(ptm->tm_mon + 1  ) << 21
  37          | (DWORD)(ptm->tm_mday     ) << 16
  38          | (DWORD)(ptm->tm_hour     ) << 11
  39          | (DWORD)(ptm->tm_min      ) << 5
  40          | (DWORD)(ptm->tm_sec/2    );
  41 }
  42
  43 FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
  44
  45 FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
  46     debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
  47     for(int i=0; i<_VOLUMES; i++) {
  48         if(_ffs[i] == 0) {
  49             _ffs[i] = this;
  50             _fsid = i;
  51             debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%d]\n", _name, _fsid);
  52             f_mount(i, &_fs);
  53             return;
  54         }
  55     }
  56     error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
  57 }
  58
  59 FATFileSystem::~FATFileSystem() {
  60     for (int i=0; i<_VOLUMES; i++) {
  61         if (_ffs[i] == this) {
  62             _ffs[i] = 0;
  63             f_mount(i, NULL);
  64         }
  65     }
  66 }
  67
  68 FileHandle *FATFileSystem::open(const char* name, int flags) {
  69     debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%d]\n", name, _name, _fsid);
  70     char n[64];
  71     sprintf(n, "%d:/%s", _fsid, name);
  72
  73     /* POSIX flags -> FatFS open mode */
  74     BYTE openmode;
  75     if (flags & O_RDWR) {
  76         openmode = FA_READ|FA_WRITE;
  77     } else if(flags & O_WRONLY) {
  78         openmode = FA_WRITE;
  79     } else {
  80         openmode = FA_READ;
  81     }
  82     if(flags & O_CREAT) {
  83         if(flags & O_TRUNC) {
  84             openmode |= FA_CREATE_ALWAYS;
  85         } else {
  86             openmode |= FA_OPEN_ALWAYS;
  87         }
  88     }
  89
  90     FIL fh;
  91     FRESULT res = f_open(&fh, n, openmode);
  92     if (res) {
  93         debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
  94         return NULL;
  95     }
  96     if (flags & O_APPEND) {
  97         f_lseek(&fh, fh.fsize);
  98     }
  99     return new FATFileHandle(fh);
 100 }
 101
 102 int FATFileSystem::remove(const char *filename) {
 103     FRESULT res = f_unlink(filename);
 104     if (res) {
 105         debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
 106         return -1;
 107     }
 108     return 0;
 109 }
 110
 111 int FATFileSystem::rename(const char *oldname, const char *newname) {
 112     FRESULT res = f_rename(oldname, newname);
 113     if (res) {
 114         debug_if(FFS_DBG, "f_rename() failed: %d\n", res);
 115         return -1;
 116     }
 117     return 0;
 118 }
 119
 120 int FATFileSystem::format() {
 121     FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
 122     if (res) {
 123         debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
 124         return -1;
 125     }
 126     return 0;
 127 }
 128
 129 DirHandle *FATFileSystem::opendir(const char *name) {
 130     FATFS_DIR dir;
 131     FRESULT res = f_opendir(&dir, name);
 132     if (res != 0) {
 133         return NULL;
 134     }
 135     return new FATDirHandle(dir);
 136 }
 137
 138 int FATFileSystem::mkdir(const char *name, mode_t mode) {
 139     FRESULT res = f_mkdir(name);
 140     return res == 0 ? 0 : -1;
 141 }
 142
 143 int FATFileSystem::mount() {
 144     FRESULT res = f_mount(_fsid, &_fs);
 145     return res == 0 ? 0 : -1;
 146 }
 147
 148 int FATFileSystem::unmount() {
 149     if (disk_sync())
 150         return -1;
 151     FRESULT res = f_mount(_fsid, NULL);
 152     return res == 0 ? 0 : -1;
 153 }