megan gimple / SDFileSystem

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Dependents:   gimple_A4_3_Temp_Light

FATFileSystem/FATFileSystem.cpp@0:07ff9ae5339f, 2021-11-13 (annotated)

Committer:
mgimple
Date:
Sat Nov 13 20:10:05 2021 +0000
Revision:
0:07ff9ae5339f
SD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mgimple 0:07ff9ae5339f 1 /* mbed Microcontroller Library
mgimple 0:07ff9ae5339f 2 * Copyright (c) 2006-2012 ARM Limited
mgimple 0:07ff9ae5339f 3 *
mgimple 0:07ff9ae5339f 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mgimple 0:07ff9ae5339f 5 * of this software and associated documentation files (the "Software"), to deal
mgimple 0:07ff9ae5339f 6 * in the Software without restriction, including without limitation the rights
mgimple 0:07ff9ae5339f 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mgimple 0:07ff9ae5339f 8 * copies of the Software, and to permit persons to whom the Software is
mgimple 0:07ff9ae5339f 9 * furnished to do so, subject to the following conditions:
mgimple 0:07ff9ae5339f 10 *
mgimple 0:07ff9ae5339f 11 * The above copyright notice and this permission notice shall be included in
mgimple 0:07ff9ae5339f 12 * all copies or substantial portions of the Software.
mgimple 0:07ff9ae5339f 13 *
mgimple 0:07ff9ae5339f 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mgimple 0:07ff9ae5339f 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mgimple 0:07ff9ae5339f 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mgimple 0:07ff9ae5339f 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mgimple 0:07ff9ae5339f 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mgimple 0:07ff9ae5339f 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mgimple 0:07ff9ae5339f 20 * SOFTWARE.
mgimple 0:07ff9ae5339f 21 */
mgimple 0:07ff9ae5339f 22 #include "mbed.h"
mgimple 0:07ff9ae5339f 23
mgimple 0:07ff9ae5339f 24 #include "ffconf.h"
mgimple 0:07ff9ae5339f 25 #include "mbed_debug.h"
mgimple 0:07ff9ae5339f 26
mgimple 0:07ff9ae5339f 27 #include "FATFileSystem.h"
mgimple 0:07ff9ae5339f 28 #include "FATFileHandle.h"
mgimple 0:07ff9ae5339f 29 #include "FATDirHandle.h"
mgimple 0:07ff9ae5339f 30
mgimple 0:07ff9ae5339f 31 DWORD get_fattime(void) {
mgimple 0:07ff9ae5339f 32 time_t rawtime;
mgimple 0:07ff9ae5339f 33 time(&rawtime);
mgimple 0:07ff9ae5339f 34 struct tm *ptm = localtime(&rawtime);
mgimple 0:07ff9ae5339f 35 return (DWORD)(ptm->tm_year - 80) << 25
mgimple 0:07ff9ae5339f 36 | (DWORD)(ptm->tm_mon + 1 ) << 21
mgimple 0:07ff9ae5339f 37 | (DWORD)(ptm->tm_mday ) << 16
mgimple 0:07ff9ae5339f 38 | (DWORD)(ptm->tm_hour ) << 11
mgimple 0:07ff9ae5339f 39 | (DWORD)(ptm->tm_min ) << 5
mgimple 0:07ff9ae5339f 40 | (DWORD)(ptm->tm_sec/2 );
mgimple 0:07ff9ae5339f 41 }
mgimple 0:07ff9ae5339f 42
mgimple 0:07ff9ae5339f 43 FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
mgimple 0:07ff9ae5339f 44
mgimple 0:07ff9ae5339f 45 FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
mgimple 0:07ff9ae5339f 46 debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
mgimple 0:07ff9ae5339f 47 for(int i=0; i<_VOLUMES; i++) {
mgimple 0:07ff9ae5339f 48 if(_ffs[i] == 0) {
mgimple 0:07ff9ae5339f 49 _ffs[i] = this;
mgimple 0:07ff9ae5339f 50 _fsid[0] = '0' + i;
mgimple 0:07ff9ae5339f 51 _fsid[1] = '\0';
mgimple 0:07ff9ae5339f 52 debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%s]\n", getName(), _fsid);
mgimple 0:07ff9ae5339f 53 f_mount(&_fs, _fsid, 0);
mgimple 0:07ff9ae5339f 54 return;
mgimple 0:07ff9ae5339f 55 }
mgimple 0:07ff9ae5339f 56 }
mgimple 0:07ff9ae5339f 57 error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
mgimple 0:07ff9ae5339f 58 }
mgimple 0:07ff9ae5339f 59
mgimple 0:07ff9ae5339f 60 FATFileSystem::~FATFileSystem() {
mgimple 0:07ff9ae5339f 61 for (int i=0; i<_VOLUMES; i++) {
mgimple 0:07ff9ae5339f 62 if (_ffs[i] == this) {
mgimple 0:07ff9ae5339f 63 _ffs[i] = 0;
mgimple 0:07ff9ae5339f 64 f_mount(NULL, _fsid, 0);
mgimple 0:07ff9ae5339f 65 }
mgimple 0:07ff9ae5339f 66 }
mgimple 0:07ff9ae5339f 67 }
mgimple 0:07ff9ae5339f 68
mgimple 0:07ff9ae5339f 69 FileHandle *FATFileSystem::open(const char* name, int flags) {
mgimple 0:07ff9ae5339f 70 debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%s]\n", name, getName(), _fsid);
mgimple 0:07ff9ae5339f 71 char n[64];
mgimple 0:07ff9ae5339f 72 sprintf(n, "%s:/%s", _fsid, name);
mgimple 0:07ff9ae5339f 73
mgimple 0:07ff9ae5339f 74 /* POSIX flags -> FatFS open mode */
mgimple 0:07ff9ae5339f 75 BYTE openmode;
mgimple 0:07ff9ae5339f 76 if (flags & O_RDWR) {
mgimple 0:07ff9ae5339f 77 openmode = FA_READ|FA_WRITE;
mgimple 0:07ff9ae5339f 78 } else if(flags & O_WRONLY) {
mgimple 0:07ff9ae5339f 79 openmode = FA_WRITE;
mgimple 0:07ff9ae5339f 80 } else {
mgimple 0:07ff9ae5339f 81 openmode = FA_READ;
mgimple 0:07ff9ae5339f 82 }
mgimple 0:07ff9ae5339f 83 if(flags & O_CREAT) {
mgimple 0:07ff9ae5339f 84 if(flags & O_TRUNC) {
mgimple 0:07ff9ae5339f 85 openmode |= FA_CREATE_ALWAYS;
mgimple 0:07ff9ae5339f 86 } else {
mgimple 0:07ff9ae5339f 87 openmode |= FA_OPEN_ALWAYS;
mgimple 0:07ff9ae5339f 88 }
mgimple 0:07ff9ae5339f 89 }
mgimple 0:07ff9ae5339f 90
mgimple 0:07ff9ae5339f 91 FIL fh;
mgimple 0:07ff9ae5339f 92 FRESULT res = f_open(&fh, n, openmode);
mgimple 0:07ff9ae5339f 93 if (res) {
mgimple 0:07ff9ae5339f 94 debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
mgimple 0:07ff9ae5339f 95 return NULL;
mgimple 0:07ff9ae5339f 96 }
mgimple 0:07ff9ae5339f 97 if (flags & O_APPEND) {
mgimple 0:07ff9ae5339f 98 f_lseek(&fh, fh.fsize);
mgimple 0:07ff9ae5339f 99 }
mgimple 0:07ff9ae5339f 100 return new FATFileHandle(fh);
mgimple 0:07ff9ae5339f 101 }
mgimple 0:07ff9ae5339f 102
mgimple 0:07ff9ae5339f 103 int FATFileSystem::open(FileHandle **file, const char *name, int flags) {
mgimple 0:07ff9ae5339f 104 FileHandle *temp = open(name, flags);
mgimple 0:07ff9ae5339f 105 if (!temp) {
mgimple 0:07ff9ae5339f 106 return -1;
mgimple 0:07ff9ae5339f 107 }
mgimple 0:07ff9ae5339f 108
mgimple 0:07ff9ae5339f 109 *file = temp;
mgimple 0:07ff9ae5339f 110 return 0;
mgimple 0:07ff9ae5339f 111 }
mgimple 0:07ff9ae5339f 112
mgimple 0:07ff9ae5339f 113 int FATFileSystem::remove(const char *filename) {
mgimple 0:07ff9ae5339f 114 FRESULT res = f_unlink(filename);
mgimple 0:07ff9ae5339f 115 if (res) {
mgimple 0:07ff9ae5339f 116 debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
mgimple 0:07ff9ae5339f 117 return -1;
mgimple 0:07ff9ae5339f 118 }
mgimple 0:07ff9ae5339f 119 return 0;
mgimple 0:07ff9ae5339f 120 }
mgimple 0:07ff9ae5339f 121
mgimple 0:07ff9ae5339f 122 int FATFileSystem::rename(const char *oldname, const char *newname) {
mgimple 0:07ff9ae5339f 123 FRESULT res = f_rename(oldname, newname);
mgimple 0:07ff9ae5339f 124 if (res) {
mgimple 0:07ff9ae5339f 125 debug_if(FFS_DBG, "f_rename() failed: %d\n", res);
mgimple 0:07ff9ae5339f 126 return -1;
mgimple 0:07ff9ae5339f 127 }
mgimple 0:07ff9ae5339f 128 return 0;
mgimple 0:07ff9ae5339f 129 }
mgimple 0:07ff9ae5339f 130
mgimple 0:07ff9ae5339f 131 int FATFileSystem::format() {
mgimple 0:07ff9ae5339f 132 FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
mgimple 0:07ff9ae5339f 133 if (res) {
mgimple 0:07ff9ae5339f 134 debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
mgimple 0:07ff9ae5339f 135 return -1;
mgimple 0:07ff9ae5339f 136 }
mgimple 0:07ff9ae5339f 137 return 0;
mgimple 0:07ff9ae5339f 138 }
mgimple 0:07ff9ae5339f 139
mgimple 0:07ff9ae5339f 140 DirHandle *FATFileSystem::opendir(const char *name) {
mgimple 0:07ff9ae5339f 141 FATFS_DIR dir;
mgimple 0:07ff9ae5339f 142 FRESULT res = f_opendir(&dir, name);
mgimple 0:07ff9ae5339f 143 if (res != 0) {
mgimple 0:07ff9ae5339f 144 return NULL;
mgimple 0:07ff9ae5339f 145 }
mgimple 0:07ff9ae5339f 146 return new FATDirHandle(dir);
mgimple 0:07ff9ae5339f 147 }
mgimple 0:07ff9ae5339f 148
mgimple 0:07ff9ae5339f 149 int FATFileSystem::open(DirHandle **dir, const char *name) {
mgimple 0:07ff9ae5339f 150 DirHandle *temp = opendir(name);
mgimple 0:07ff9ae5339f 151 if (!temp) {
mgimple 0:07ff9ae5339f 152 return -1;
mgimple 0:07ff9ae5339f 153 }
mgimple 0:07ff9ae5339f 154
mgimple 0:07ff9ae5339f 155 *dir = temp;
mgimple 0:07ff9ae5339f 156 return 0;
mgimple 0:07ff9ae5339f 157 }
mgimple 0:07ff9ae5339f 158
mgimple 0:07ff9ae5339f 159 int FATFileSystem::mkdir(const char *name, mode_t mode) {
mgimple 0:07ff9ae5339f 160 FRESULT res = f_mkdir(name);
mgimple 0:07ff9ae5339f 161 return res == 0 ? 0 : -1;
mgimple 0:07ff9ae5339f 162 }
mgimple 0:07ff9ae5339f 163
mgimple 0:07ff9ae5339f 164 int FATFileSystem::mount() {
mgimple 0:07ff9ae5339f 165 FRESULT res = f_mount(&_fs, _fsid, 1);
mgimple 0:07ff9ae5339f 166 return res == 0 ? 0 : -1;
mgimple 0:07ff9ae5339f 167 }
mgimple 0:07ff9ae5339f 168
mgimple 0:07ff9ae5339f 169 int FATFileSystem::unmount() {
mgimple 0:07ff9ae5339f 170 if (disk_sync())
mgimple 0:07ff9ae5339f 171 return -1;
mgimple 0:07ff9ae5339f 172 FRESULT res = f_mount(NULL, _fsid, 0);
mgimple 0:07ff9ae5339f 173 return res == 0 ? 0 : -1;
mgimple 0:07ff9ae5339f 174 }