Diff: mbd_os/libraries/fs/fat/FATFileSystem.cpp

Revision:

1:55a6170b404f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbd_os/libraries/fs/fat/FATFileSystem.cpp	Sat Sep 17 16:32:05 2016 +0000
@@ -0,0 +1,209 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "mbed.h"
+
+#include "ffconf.h"
+#include "mbed_debug.h"
+
+#include "FATFileSystem.h"
+#include "FATFileHandle.h"
+#include "FATDirHandle.h"
+#include "critical.h"
+
+DWORD get_fattime(void) {
+    time_t rawtime;
+    time(&rawtime);
+    struct tm *ptm = localtime(&rawtime);
+    return (DWORD)(ptm->tm_year - 80) << 25
+         | (DWORD)(ptm->tm_mon + 1  ) << 21
+         | (DWORD)(ptm->tm_mday     ) << 16
+         | (DWORD)(ptm->tm_hour     ) << 11
+         | (DWORD)(ptm->tm_min      ) << 5
+         | (DWORD)(ptm->tm_sec/2    );
+}
+
+FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
+static PlatformMutex * mutex = NULL;
+
+PlatformMutex * get_fat_mutex() {
+    PlatformMutex * new_mutex = new PlatformMutex;
+
+    core_util_critical_section_enter();
+    if (NULL == mutex) {
+        mutex = new_mutex;
+    }
+    core_util_critical_section_exit();
+
+    if (mutex != new_mutex) {
+        delete new_mutex;
+    }
+    return mutex;
+}
+
+FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n), _mutex(get_fat_mutex()) {
+    lock();
+    debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
+    for(int i=0; i<_VOLUMES; i++) {
+        if(_ffs[i] == 0) {
+            _ffs[i] = this;
+            _fsid[0] = '0' + i;
+            _fsid[1] = '\0';
+            debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%s]\n", getName(), _fsid);
+            f_mount(&_fs, _fsid, 0);
+            unlock();
+            return;
+        }
+    }
+    error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
+    unlock();
+}
+
+FATFileSystem::~FATFileSystem() {
+    lock();
+    for (int i=0; i<_VOLUMES; i++) {
+        if (_ffs[i] == this) {
+            _ffs[i] = 0;
+            f_mount(NULL, _fsid, 0);
+        }
+    }
+    unlock();
+}
+
+FileHandle *FATFileSystem::open(const char* name, int flags) {
+    lock();
+    debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%s]\n", name, getName(), _fsid);
+    char n[64];
+    sprintf(n, "%s:/%s", _fsid, name);
+
+    /* POSIX flags -> FatFS open mode */
+    BYTE openmode;
+    if (flags & O_RDWR) {
+        openmode = FA_READ|FA_WRITE;
+    } else if(flags & O_WRONLY) {
+        openmode = FA_WRITE;
+    } else {
+        openmode = FA_READ;
+    }
+    if(flags & O_CREAT) {
+        if(flags & O_TRUNC) {
+            openmode |= FA_CREATE_ALWAYS;
+        } else {
+            openmode |= FA_OPEN_ALWAYS;
+        }
+    }
+
+    FIL fh;
+    FRESULT res = f_open(&fh, n, openmode);
+    if (res) {
+        debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
+        unlock();
+        return NULL;
+    }
+    if (flags & O_APPEND) {
+        f_lseek(&fh, fh.fsize);
+    }
+    FATFileHandle * handle = new FATFileHandle(fh, _mutex);
+    unlock();
+    return handle;
+}
+
+int FATFileSystem::remove(const char *filename) {
+    lock();
+    FRESULT res = f_unlink(filename);
+    if (res) {
+        debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
+        unlock();
+        return -1;
+    }
+    unlock();
+    return 0;
+}
+
+int FATFileSystem::rename(const char *oldname, const char *newname) {
+    lock();
+    FRESULT res = f_rename(oldname, newname);
+    if (res) {
+        debug_if(FFS_DBG, "f_rename() failed: %d\n", res);
+        unlock();
+        return -1;
+    }
+    unlock();
+    return 0;
+}
+
+int FATFileSystem::format() {
+    lock();
+    FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
+    if (res) {
+        debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
+        unlock();
+        return -1;
+    }
+    unlock();
+    return 0;
+}
+
+DirHandle *FATFileSystem::opendir(const char *name) {
+    lock();
+    FATFS_DIR dir;
+    FRESULT res = f_opendir(&dir, name);
+    if (res != 0) {
+        unlock();
+        return NULL;
+    }
+    FATDirHandle *handle = new FATDirHandle(dir, _mutex);
+    unlock();
+    return handle;
+}
+
+int FATFileSystem::mkdir(const char *name, mode_t mode) {
+    lock();
+    FRESULT res = f_mkdir(name);
+    unlock();
+    return res == 0 ? 0 : -1;
+}
+
+int FATFileSystem::mount() {
+    lock();
+    FRESULT res = f_mount(&_fs, _fsid, 1);
+    unlock();
+    return res == 0 ? 0 : -1;
+}
+
+int FATFileSystem::unmount() {
+    lock();
+    if (disk_sync()) {
+        unlock();
+        return -1;
+    }
+    FRESULT res = f_mount(NULL, _fsid, 0);
+    unlock();
+    return res == 0 ? 0 : -1;
+}
+
+void FATFileSystem::lock() {
+    _mutex->lock();
+}
+
+void FATFileSystem::unlock() {
+    _mutex->unlock();
+}