Madeline Kistler / SDFileSystem2

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FATFileSystem/FATFileSystem.cpp@0:812e8b0b2832, 2020-11-17 (annotated)

Committer:
mkistler
Date:
Tue Nov 17 20:30:08 2020 +0000
Revision:
0:812e8b0b2832
Final draft.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mkistler 0:812e8b0b2832 1 /* mbed Microcontroller Library
mkistler 0:812e8b0b2832 2 * Copyright (c) 2006-2012 ARM Limited
mkistler 0:812e8b0b2832 3 *
mkistler 0:812e8b0b2832 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mkistler 0:812e8b0b2832 5 * of this software and associated documentation files (the "Software"), to deal
mkistler 0:812e8b0b2832 6 * in the Software without restriction, including without limitation the rights
mkistler 0:812e8b0b2832 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mkistler 0:812e8b0b2832 8 * copies of the Software, and to permit persons to whom the Software is
mkistler 0:812e8b0b2832 9 * furnished to do so, subject to the following conditions:
mkistler 0:812e8b0b2832 10 *
mkistler 0:812e8b0b2832 11 * The above copyright notice and this permission notice shall be included in
mkistler 0:812e8b0b2832 12 * all copies or substantial portions of the Software.
mkistler 0:812e8b0b2832 13 *
mkistler 0:812e8b0b2832 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mkistler 0:812e8b0b2832 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mkistler 0:812e8b0b2832 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mkistler 0:812e8b0b2832 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mkistler 0:812e8b0b2832 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mkistler 0:812e8b0b2832 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mkistler 0:812e8b0b2832 20 * SOFTWARE.
mkistler 0:812e8b0b2832 21 */
mkistler 0:812e8b0b2832 22 #include "mbed.h"
mkistler 0:812e8b0b2832 23
mkistler 0:812e8b0b2832 24 #include "ffconf.h"
mkistler 0:812e8b0b2832 25 #include "mbed_debug.h"
mkistler 0:812e8b0b2832 26
mkistler 0:812e8b0b2832 27 #include "FATFileSystem.h"
mkistler 0:812e8b0b2832 28 #include "FATFileHandle.h"
mkistler 0:812e8b0b2832 29 #include "FATDirHandle.h"
mkistler 0:812e8b0b2832 30
mkistler 0:812e8b0b2832 31 DWORD get_fattime(void) {
mkistler 0:812e8b0b2832 32 time_t rawtime;
mkistler 0:812e8b0b2832 33 time(&rawtime);
mkistler 0:812e8b0b2832 34 struct tm *ptm = localtime(&rawtime);
mkistler 0:812e8b0b2832 35 return (DWORD)(ptm->tm_year - 80) << 25
mkistler 0:812e8b0b2832 36 | (DWORD)(ptm->tm_mon + 1 ) << 21
mkistler 0:812e8b0b2832 37 | (DWORD)(ptm->tm_mday ) << 16
mkistler 0:812e8b0b2832 38 | (DWORD)(ptm->tm_hour ) << 11
mkistler 0:812e8b0b2832 39 | (DWORD)(ptm->tm_min ) << 5
mkistler 0:812e8b0b2832 40 | (DWORD)(ptm->tm_sec/2 );
mkistler 0:812e8b0b2832 41 }
mkistler 0:812e8b0b2832 42
mkistler 0:812e8b0b2832 43 FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
mkistler 0:812e8b0b2832 44
mkistler 0:812e8b0b2832 45 FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
mkistler 0:812e8b0b2832 46 debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
mkistler 0:812e8b0b2832 47 for(int i=0; i<_VOLUMES; i++) {
mkistler 0:812e8b0b2832 48 if(_ffs[i] == 0) {
mkistler 0:812e8b0b2832 49 _ffs[i] = this;
mkistler 0:812e8b0b2832 50 _fsid[0] = '0' + i;
mkistler 0:812e8b0b2832 51 _fsid[1] = '\0';
mkistler 0:812e8b0b2832 52 debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%s]\n", getName(), _fsid);
mkistler 0:812e8b0b2832 53 f_mount(&_fs, _fsid, 0);
mkistler 0:812e8b0b2832 54 return;
mkistler 0:812e8b0b2832 55 }
mkistler 0:812e8b0b2832 56 }
mkistler 0:812e8b0b2832 57 error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
mkistler 0:812e8b0b2832 58 }
mkistler 0:812e8b0b2832 59
mkistler 0:812e8b0b2832 60 FATFileSystem::~FATFileSystem() {
mkistler 0:812e8b0b2832 61 for (int i=0; i<_VOLUMES; i++) {
mkistler 0:812e8b0b2832 62 if (_ffs[i] == this) {
mkistler 0:812e8b0b2832 63 _ffs[i] = 0;
mkistler 0:812e8b0b2832 64 f_mount(NULL, _fsid, 0);
mkistler 0:812e8b0b2832 65 }
mkistler 0:812e8b0b2832 66 }
mkistler 0:812e8b0b2832 67 }
mkistler 0:812e8b0b2832 68
mkistler 0:812e8b0b2832 69 FileHandle *FATFileSystem::open(const char* name, int flags) {
mkistler 0:812e8b0b2832 70 debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%s]\n", name, getName(), _fsid);
mkistler 0:812e8b0b2832 71 char n[64];
mkistler 0:812e8b0b2832 72 sprintf(n, "%s:/%s", _fsid, name);
mkistler 0:812e8b0b2832 73
mkistler 0:812e8b0b2832 74 /* POSIX flags -> FatFS open mode */
mkistler 0:812e8b0b2832 75 BYTE openmode;
mkistler 0:812e8b0b2832 76 if (flags & O_RDWR) {
mkistler 0:812e8b0b2832 77 openmode = FA_READ|FA_WRITE;
mkistler 0:812e8b0b2832 78 } else if(flags & O_WRONLY) {
mkistler 0:812e8b0b2832 79 openmode = FA_WRITE;
mkistler 0:812e8b0b2832 80 } else {
mkistler 0:812e8b0b2832 81 openmode = FA_READ;
mkistler 0:812e8b0b2832 82 }
mkistler 0:812e8b0b2832 83 if(flags & O_CREAT) {
mkistler 0:812e8b0b2832 84 if(flags & O_TRUNC) {
mkistler 0:812e8b0b2832 85 openmode |= FA_CREATE_ALWAYS;
mkistler 0:812e8b0b2832 86 } else {
mkistler 0:812e8b0b2832 87 openmode |= FA_OPEN_ALWAYS;
mkistler 0:812e8b0b2832 88 }
mkistler 0:812e8b0b2832 89 }
mkistler 0:812e8b0b2832 90
mkistler 0:812e8b0b2832 91 FIL fh;
mkistler 0:812e8b0b2832 92 FRESULT res = f_open(&fh, n, openmode);
mkistler 0:812e8b0b2832 93 if (res) {
mkistler 0:812e8b0b2832 94 debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
mkistler 0:812e8b0b2832 95 return NULL;
mkistler 0:812e8b0b2832 96 }
mkistler 0:812e8b0b2832 97 if (flags & O_APPEND) {
mkistler 0:812e8b0b2832 98 f_lseek(&fh, fh.fsize);
mkistler 0:812e8b0b2832 99 }
mkistler 0:812e8b0b2832 100 return new FATFileHandle(fh);
mkistler 0:812e8b0b2832 101 }
mkistler 0:812e8b0b2832 102
mkistler 0:812e8b0b2832 103 int FATFileSystem::open(FileHandle **file, const char *name, int flags) {
mkistler 0:812e8b0b2832 104 FileHandle *temp = open(name, flags);
mkistler 0:812e8b0b2832 105 if (!temp) {
mkistler 0:812e8b0b2832 106 return -1;
mkistler 0:812e8b0b2832 107 }
mkistler 0:812e8b0b2832 108
mkistler 0:812e8b0b2832 109 *file = temp;
mkistler 0:812e8b0b2832 110 return 0;
mkistler 0:812e8b0b2832 111 }
mkistler 0:812e8b0b2832 112
mkistler 0:812e8b0b2832 113 int FATFileSystem::remove(const char *filename) {
mkistler 0:812e8b0b2832 114 FRESULT res = f_unlink(filename);
mkistler 0:812e8b0b2832 115 if (res) {
mkistler 0:812e8b0b2832 116 debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
mkistler 0:812e8b0b2832 117 return -1;
mkistler 0:812e8b0b2832 118 }
mkistler 0:812e8b0b2832 119 return 0;
mkistler 0:812e8b0b2832 120 }
mkistler 0:812e8b0b2832 121
mkistler 0:812e8b0b2832 122 int FATFileSystem::rename(const char *oldname, const char *newname) {
mkistler 0:812e8b0b2832 123 FRESULT res = f_rename(oldname, newname);
mkistler 0:812e8b0b2832 124 if (res) {
mkistler 0:812e8b0b2832 125 debug_if(FFS_DBG, "f_rename() failed: %d\n", res);
mkistler 0:812e8b0b2832 126 return -1;
mkistler 0:812e8b0b2832 127 }
mkistler 0:812e8b0b2832 128 return 0;
mkistler 0:812e8b0b2832 129 }
mkistler 0:812e8b0b2832 130
mkistler 0:812e8b0b2832 131 int FATFileSystem::format() {
mkistler 0:812e8b0b2832 132 FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
mkistler 0:812e8b0b2832 133 if (res) {
mkistler 0:812e8b0b2832 134 debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
mkistler 0:812e8b0b2832 135 return -1;
mkistler 0:812e8b0b2832 136 }
mkistler 0:812e8b0b2832 137 return 0;
mkistler 0:812e8b0b2832 138 }
mkistler 0:812e8b0b2832 139
mkistler 0:812e8b0b2832 140 DirHandle *FATFileSystem::opendir(const char *name) {
mkistler 0:812e8b0b2832 141 FATFS_DIR dir;
mkistler 0:812e8b0b2832 142 FRESULT res = f_opendir(&dir, name);
mkistler 0:812e8b0b2832 143 if (res != 0) {
mkistler 0:812e8b0b2832 144 return NULL;
mkistler 0:812e8b0b2832 145 }
mkistler 0:812e8b0b2832 146 return new FATDirHandle(dir);
mkistler 0:812e8b0b2832 147 }
mkistler 0:812e8b0b2832 148
mkistler 0:812e8b0b2832 149 int FATFileSystem::open(DirHandle **dir, const char *name) {
mkistler 0:812e8b0b2832 150 DirHandle *temp = opendir(name);
mkistler 0:812e8b0b2832 151 if (!temp) {
mkistler 0:812e8b0b2832 152 return -1;
mkistler 0:812e8b0b2832 153 }
mkistler 0:812e8b0b2832 154
mkistler 0:812e8b0b2832 155 *dir = temp;
mkistler 0:812e8b0b2832 156 return 0;
mkistler 0:812e8b0b2832 157 }
mkistler 0:812e8b0b2832 158
mkistler 0:812e8b0b2832 159 int FATFileSystem::mkdir(const char *name, mode_t mode) {
mkistler 0:812e8b0b2832 160 FRESULT res = f_mkdir(name);
mkistler 0:812e8b0b2832 161 return res == 0 ? 0 : -1;
mkistler 0:812e8b0b2832 162 }
mkistler 0:812e8b0b2832 163
mkistler 0:812e8b0b2832 164 int FATFileSystem::mount() {
mkistler 0:812e8b0b2832 165 FRESULT res = f_mount(&_fs, _fsid, 1);
mkistler 0:812e8b0b2832 166 return res == 0 ? 0 : -1;
mkistler 0:812e8b0b2832 167 }
mkistler 0:812e8b0b2832 168
mkistler 0:812e8b0b2832 169 int FATFileSystem::unmount() {
mkistler 0:812e8b0b2832 170 if (disk_sync())
mkistler 0:812e8b0b2832 171 return -1;
mkistler 0:812e8b0b2832 172 FRESULT res = f_mount(NULL, _fsid, 0);
mkistler 0:812e8b0b2832 173 return res == 0 ? 0 : -1;
mkistler 0:812e8b0b2832 174 }