Diff: mbed/drivers/LocalFileSystem.h

Revision:

0:d6c9b09b4042

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed/drivers/LocalFileSystem.h	Wed Dec 02 18:02:03 2020 +0000
@@ -0,0 +1,114 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_LOCALFILESYSTEM_H
+#define MBED_LOCALFILESYSTEM_H
+
+#include "platform/platform.h"
+
+#if DEVICE_LOCALFILESYSTEM
+
+#include "drivers/FileSystemLike.h"
+#include "platform/PlatformMutex.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+
+FILEHANDLE local_file_open(const char* name, int flags);
+
+class LocalFileHandle : public FileHandle {
+
+public:
+    LocalFileHandle(FILEHANDLE fh);
+
+    virtual int close();
+
+    virtual ssize_t write(const void *buffer, size_t length);
+
+    virtual ssize_t read(void *buffer, size_t length);
+
+    virtual int isatty();
+
+    virtual off_t lseek(off_t position, int whence);
+
+    virtual int fsync();
+
+    virtual off_t flen();
+
+protected:
+    virtual void lock();
+    virtual void unlock();
+    FILEHANDLE _fh;
+    int pos;
+    PlatformMutex _mutex;
+};
+
+/** A filesystem for accessing the local mbed Microcontroller USB disk drive
+ *
+ *  This allows programs to read and write files on the same disk drive that is used to program the
+ *  mbed Microcontroller. Once created, the standard C file access functions are used to open,
+ *  read and write files.
+ *
+ * @Note Synchronization level: Thread safe
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ *
+ * LocalFileSystem local("local");               // Create the local filesystem under the name "local"
+ *
+ * int main() {
+ *     FILE *fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
+ *     fprintf(fp, "Hello World!");
+ *     fclose(fp);
+ *     remove("/local/out.txt");                 // Removes the file "out.txt" from the local file system
+ *
+ *     DIR *d = opendir("/local");               // Opens the root directory of the local file system
+ *     struct dirent *p;
+ *     while((p = readdir(d)) != NULL) {         // Print the names of the files in the local file system
+ *       printf("%s\n", p->d_name);              // to stdout.
+ *     }
+ *     closedir(d);
+ * }
+ * @endcode
+ *
+ * @note
+ *  If the microcontroller program makes an access to the local drive, it will be marked as "removed"
+ *  on the Host computer. This means it is no longer accessible from the Host Computer.
+ *
+ *  The drive will only re-appear when the microcontroller program exists. Note that if the program does
+ *  not exit, you will need to hold down reset on the mbed Microcontroller to be able to see the drive again!
+ */
+class LocalFileSystem : public FileSystemLike {
+    // No modifiable state
+
+public:
+    LocalFileSystem(const char* n) : FileSystemLike(n) {
+
+    }
+
+    virtual FileHandle *open(const char* name, int flags);
+    virtual int remove(const char *filename);
+    virtual DirHandle *opendir(const char *name);
+};
+
+} // namespace mbed
+
+#endif
+
+#endif
+
+/** @}*/