FATFileSystem.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #include "mbed.h"
00023 
00024 #include "ffconf.h"
00025 #include "mbed_debug.h"
00026 
00027 #include "FATFileSystem.h"
00028 #include "FATFileHandle.h"
00029 #include "FATDirHandle.h"
00030 
00031 DWORD get_fattime(void) {
00032     time_t rawtime;
00033     time(&rawtime);
00034     struct tm *ptm = localtime(&rawtime);
00035     return (DWORD)(ptm->tm_year - 80) << 25
00036          | (DWORD)(ptm->tm_mon + 1  ) << 21
00037          | (DWORD)(ptm->tm_mday     ) << 16
00038          | (DWORD)(ptm->tm_hour     ) << 11
00039          | (DWORD)(ptm->tm_min      ) << 5
00040          | (DWORD)(ptm->tm_sec/2    );
00041 }
00042 
00043 FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
00044 
00045 FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
00046     debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
00047     for(int i=0; i<_VOLUMES; i++) {
00048         if(_ffs[i] == 0) {
00049             _ffs[i] = this;
00050             _fsid = i;
00051             debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%d]\n", _name, _fsid);
00052             f_mount(i, &_fs);
00053             return;
00054         }
00055     }
00056     error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
00057 }
00058 
00059 FATFileSystem::~FATFileSystem() {
00060     for (int i=0; i<_VOLUMES; i++) {
00061         if (_ffs[i] == this) {
00062             _ffs[i] = 0;
00063             f_mount(i, NULL);
00064         }
00065     }
00066 }
00067 
00068 FileHandle *FATFileSystem::open(const char* name, int flags) {
00069     debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%d]\n", name, _name, _fsid);
00070     char n[64];
00071     sprintf(n, "%d:/%s", _fsid, name);
00072     
00073     /* POSIX flags -> FatFS open mode */
00074     BYTE openmode;
00075     if (flags & O_RDWR) {
00076         openmode = FA_READ|FA_WRITE;
00077     } else if(flags & O_WRONLY) {
00078         openmode = FA_WRITE;
00079     } else {
00080         openmode = FA_READ;
00081     }
00082     if(flags & O_CREAT) {
00083         if(flags & O_TRUNC) {
00084             openmode |= FA_CREATE_ALWAYS;
00085         } else {
00086             openmode |= FA_OPEN_ALWAYS;
00087         }
00088     }
00089     
00090     FIL fh;
00091     FRESULT res = f_open(&fh, n, openmode);
00092     if (res) { 
00093         debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
00094         return NULL;
00095     }
00096     if (flags & O_APPEND) {
00097         f_lseek(&fh, fh.fsize);
00098     }
00099     return new FATFileHandle(fh);
00100 }
00101     
00102 int FATFileSystem::remove(const char *filename) {
00103     FRESULT res = f_unlink(filename);
00104     if (res) { 
00105         debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
00106         return -1;
00107     }
00108     return 0;
00109 }
00110 
00111 int FATFileSystem::format() {
00112     FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
00113     if (res) {
00114         debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
00115         return -1;
00116     }
00117     return 0;
00118 }
00119 
00120 DirHandle *FATFileSystem::opendir(const char *name) {
00121     FATFS_DIR dir;
00122     FRESULT res = f_opendir(&dir, name);
00123     if (res != 0) {
00124         return NULL;
00125     }
00126     return new FATDirHandle(dir);
00127 }
00128 
00129 int FATFileSystem::mkdir(const char *name, mode_t mode) {
00130     FRESULT res = f_mkdir(name);
00131     return res == 0 ? 0 : -1;
00132 }