Ricardo Benitez / FATFileSystem

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Fork of FATFileSystem by mbed official

FATFileSystem.cpp@1:46ce1e16c870, 2012-11-27 (annotated)

Committer:
emilmont
Date:
Tue Nov 27 17:31:18 2012 +0000
Revision:
1:46ce1e16c870
Child:
2:b6669c987c8e
Commit FATFileSystem code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:46ce1e16c870 1 /* mbed Microcontroller Library
emilmont 1:46ce1e16c870 2 * Copyright (c) 2006-2012 ARM Limited
emilmont 1:46ce1e16c870 3 *
emilmont 1:46ce1e16c870 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
emilmont 1:46ce1e16c870 5 * of this software and associated documentation files (the "Software"), to deal
emilmont 1:46ce1e16c870 6 * in the Software without restriction, including without limitation the rights
emilmont 1:46ce1e16c870 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
emilmont 1:46ce1e16c870 8 * copies of the Software, and to permit persons to whom the Software is
emilmont 1:46ce1e16c870 9 * furnished to do so, subject to the following conditions:
emilmont 1:46ce1e16c870 10 *
emilmont 1:46ce1e16c870 11 * The above copyright notice and this permission notice shall be included in
emilmont 1:46ce1e16c870 12 * all copies or substantial portions of the Software.
emilmont 1:46ce1e16c870 13 *
emilmont 1:46ce1e16c870 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
emilmont 1:46ce1e16c870 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
emilmont 1:46ce1e16c870 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
emilmont 1:46ce1e16c870 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
emilmont 1:46ce1e16c870 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
emilmont 1:46ce1e16c870 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
emilmont 1:46ce1e16c870 20 * SOFTWARE.
emilmont 1:46ce1e16c870 21 */
emilmont 1:46ce1e16c870 22 #include "mbed.h"
emilmont 1:46ce1e16c870 23
emilmont 1:46ce1e16c870 24 #include "ffconf.h"
emilmont 1:46ce1e16c870 25 #include "debug.h"
emilmont 1:46ce1e16c870 26
emilmont 1:46ce1e16c870 27 #include "FATFileSystem.h"
emilmont 1:46ce1e16c870 28 #include "FATFileHandle.h"
emilmont 1:46ce1e16c870 29 #include "FATDirHandle.h"
emilmont 1:46ce1e16c870 30
emilmont 1:46ce1e16c870 31 DWORD get_fattime(void) {
emilmont 1:46ce1e16c870 32 time_t rawtime;
emilmont 1:46ce1e16c870 33 time(&rawtime);
emilmont 1:46ce1e16c870 34 struct tm *ptm = localtime(&rawtime);
emilmont 1:46ce1e16c870 35 return (DWORD)(ptm->tm_year - 80) << 25
emilmont 1:46ce1e16c870 36 | (DWORD)(ptm->tm_mon + 1 ) << 21
emilmont 1:46ce1e16c870 37 | (DWORD)(ptm->tm_mday ) << 16
emilmont 1:46ce1e16c870 38 | (DWORD)(ptm->tm_hour ) << 11
emilmont 1:46ce1e16c870 39 | (DWORD)(ptm->tm_min ) << 5
emilmont 1:46ce1e16c870 40 | (DWORD)(ptm->tm_sec/2 );
emilmont 1:46ce1e16c870 41 }
emilmont 1:46ce1e16c870 42
emilmont 1:46ce1e16c870 43 FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
emilmont 1:46ce1e16c870 44
emilmont 1:46ce1e16c870 45 FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
emilmont 1:46ce1e16c870 46 debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
emilmont 1:46ce1e16c870 47 for(int i=0; i<_VOLUMES; i++) {
emilmont 1:46ce1e16c870 48 if(_ffs[i] == 0) {
emilmont 1:46ce1e16c870 49 _ffs[i] = this;
emilmont 1:46ce1e16c870 50 _fsid = i;
emilmont 1:46ce1e16c870 51 debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%d]\n", _name, _fsid);
emilmont 1:46ce1e16c870 52 f_mount(i, &_fs);
emilmont 1:46ce1e16c870 53 return;
emilmont 1:46ce1e16c870 54 }
emilmont 1:46ce1e16c870 55 }
emilmont 1:46ce1e16c870 56 error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
emilmont 1:46ce1e16c870 57 }
emilmont 1:46ce1e16c870 58
emilmont 1:46ce1e16c870 59 FATFileSystem::~FATFileSystem() {
emilmont 1:46ce1e16c870 60 for (int i=0; i<_VOLUMES; i++) {
emilmont 1:46ce1e16c870 61 if (_ffs[i] == this) {
emilmont 1:46ce1e16c870 62 _ffs[i] = 0;
emilmont 1:46ce1e16c870 63 f_mount(i, NULL);
emilmont 1:46ce1e16c870 64 }
emilmont 1:46ce1e16c870 65 }
emilmont 1:46ce1e16c870 66 }
emilmont 1:46ce1e16c870 67
emilmont 1:46ce1e16c870 68 FileHandle *FATFileSystem::open(const char* name, int flags) {
emilmont 1:46ce1e16c870 69 debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%d]\n", name, _name, _fsid);
emilmont 1:46ce1e16c870 70 char n[64];
emilmont 1:46ce1e16c870 71 sprintf(n, "%d:/%s", _fsid, name);
emilmont 1:46ce1e16c870 72
emilmont 1:46ce1e16c870 73 /* POSIX flags -> FatFS open mode */
emilmont 1:46ce1e16c870 74 BYTE openmode;
emilmont 1:46ce1e16c870 75 if (flags & O_RDWR) {
emilmont 1:46ce1e16c870 76 openmode = FA_READ|FA_WRITE;
emilmont 1:46ce1e16c870 77 } else if(flags & O_WRONLY) {
emilmont 1:46ce1e16c870 78 openmode = FA_WRITE;
emilmont 1:46ce1e16c870 79 } else {
emilmont 1:46ce1e16c870 80 openmode = FA_READ;
emilmont 1:46ce1e16c870 81 }
emilmont 1:46ce1e16c870 82 if(flags & O_CREAT) {
emilmont 1:46ce1e16c870 83 if(flags & O_TRUNC) {
emilmont 1:46ce1e16c870 84 openmode |= FA_CREATE_ALWAYS;
emilmont 1:46ce1e16c870 85 } else {
emilmont 1:46ce1e16c870 86 openmode |= FA_OPEN_ALWAYS;
emilmont 1:46ce1e16c870 87 }
emilmont 1:46ce1e16c870 88 }
emilmont 1:46ce1e16c870 89
emilmont 1:46ce1e16c870 90 FIL fh;
emilmont 1:46ce1e16c870 91 FRESULT res = f_open(&fh, n, openmode);
emilmont 1:46ce1e16c870 92 if (res) {
emilmont 1:46ce1e16c870 93 debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
emilmont 1:46ce1e16c870 94 return NULL;
emilmont 1:46ce1e16c870 95 }
emilmont 1:46ce1e16c870 96 if (flags & O_APPEND) {
emilmont 1:46ce1e16c870 97 f_lseek(&fh, fh.fsize);
emilmont 1:46ce1e16c870 98 }
emilmont 1:46ce1e16c870 99 return new FATFileHandle(fh);
emilmont 1:46ce1e16c870 100 }
emilmont 1:46ce1e16c870 101
emilmont 1:46ce1e16c870 102 int FATFileSystem::remove(const char *filename) {
emilmont 1:46ce1e16c870 103 FRESULT res = f_unlink(filename);
emilmont 1:46ce1e16c870 104 if (res) {
emilmont 1:46ce1e16c870 105 debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
emilmont 1:46ce1e16c870 106 return -1;
emilmont 1:46ce1e16c870 107 }
emilmont 1:46ce1e16c870 108 return 0;
emilmont 1:46ce1e16c870 109 }
emilmont 1:46ce1e16c870 110
emilmont 1:46ce1e16c870 111 int FATFileSystem::format() {
emilmont 1:46ce1e16c870 112 FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
emilmont 1:46ce1e16c870 113 if (res) {
emilmont 1:46ce1e16c870 114 debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
emilmont 1:46ce1e16c870 115 return -1;
emilmont 1:46ce1e16c870 116 }
emilmont 1:46ce1e16c870 117 return 0;
emilmont 1:46ce1e16c870 118 }
emilmont 1:46ce1e16c870 119
emilmont 1:46ce1e16c870 120 DirHandle *FATFileSystem::opendir(const char *name) {
emilmont 1:46ce1e16c870 121 FATFS_DIR dir;
emilmont 1:46ce1e16c870 122 FRESULT res = f_opendir(&dir, name);
emilmont 1:46ce1e16c870 123 if (res != 0) {
emilmont 1:46ce1e16c870 124 return NULL;
emilmont 1:46ce1e16c870 125 }
emilmont 1:46ce1e16c870 126 return new FATDirHandle(dir);
emilmont 1:46ce1e16c870 127 }
emilmont 1:46ce1e16c870 128
emilmont 1:46ce1e16c870 129 int FATFileSystem::mkdir(const char *name, mode_t mode) {
emilmont 1:46ce1e16c870 130 FRESULT res = f_mkdir(name);
emilmont 1:46ce1e16c870 131 return res == 0 ? 0 : -1;
emilmont 1:46ce1e16c870 132 }