Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

drivers/LocalFileSystem.h@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #ifndef MBED_LOCALFILESYSTEM_H
elessair 0:f269e3021894 17 #define MBED_LOCALFILESYSTEM_H
elessair 0:f269e3021894 18
elessair 0:f269e3021894 19 #include "platform/platform.h"
elessair 0:f269e3021894 20
elessair 0:f269e3021894 21 #if DEVICE_LOCALFILESYSTEM
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 #include "drivers/FileSystemLike.h"
elessair 0:f269e3021894 24 #include "platform/PlatformMutex.h"
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 namespace mbed {
elessair 0:f269e3021894 27 /** \addtogroup drivers */
elessair 0:f269e3021894 28 /** @{*/
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 FILEHANDLE local_file_open(const char* name, int flags);
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 class LocalFileHandle : public FileHandle {
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 public:
elessair 0:f269e3021894 35 LocalFileHandle(FILEHANDLE fh);
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 virtual int close();
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 virtual ssize_t write(const void *buffer, size_t length);
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 virtual ssize_t read(void *buffer, size_t length);
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 virtual int isatty();
elessair 0:f269e3021894 44
elessair 0:f269e3021894 45 virtual off_t lseek(off_t position, int whence);
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 virtual int fsync();
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 virtual off_t flen();
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 protected:
elessair 0:f269e3021894 52 virtual void lock();
elessair 0:f269e3021894 53 virtual void unlock();
elessair 0:f269e3021894 54 FILEHANDLE _fh;
elessair 0:f269e3021894 55 int pos;
elessair 0:f269e3021894 56 PlatformMutex _mutex;
elessair 0:f269e3021894 57 };
elessair 0:f269e3021894 58
elessair 0:f269e3021894 59 /** A filesystem for accessing the local mbed Microcontroller USB disk drive
elessair 0:f269e3021894 60 *
elessair 0:f269e3021894 61 * This allows programs to read and write files on the same disk drive that is used to program the
elessair 0:f269e3021894 62 * mbed Microcontroller. Once created, the standard C file access functions are used to open,
elessair 0:f269e3021894 63 * read and write files.
elessair 0:f269e3021894 64 *
elessair 0:f269e3021894 65 * @Note Synchronization level: Thread safe
elessair 0:f269e3021894 66 *
elessair 0:f269e3021894 67 * Example:
elessair 0:f269e3021894 68 * @code
elessair 0:f269e3021894 69 * #include "mbed.h"
elessair 0:f269e3021894 70 *
elessair 0:f269e3021894 71 * LocalFileSystem local("local"); // Create the local filesystem under the name "local"
elessair 0:f269e3021894 72 *
elessair 0:f269e3021894 73 * int main() {
elessair 0:f269e3021894 74 * FILE *fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
elessair 0:f269e3021894 75 * fprintf(fp, "Hello World!");
elessair 0:f269e3021894 76 * fclose(fp);
elessair 0:f269e3021894 77 * remove("/local/out.txt"); // Removes the file "out.txt" from the local file system
elessair 0:f269e3021894 78 *
elessair 0:f269e3021894 79 * DIR *d = opendir("/local"); // Opens the root directory of the local file system
elessair 0:f269e3021894 80 * struct dirent *p;
elessair 0:f269e3021894 81 * while((p = readdir(d)) != NULL) { // Print the names of the files in the local file system
elessair 0:f269e3021894 82 * printf("%s\n", p->d_name); // to stdout.
elessair 0:f269e3021894 83 * }
elessair 0:f269e3021894 84 * closedir(d);
elessair 0:f269e3021894 85 * }
elessair 0:f269e3021894 86 * @endcode
elessair 0:f269e3021894 87 *
elessair 0:f269e3021894 88 * @note
elessair 0:f269e3021894 89 * If the microcontroller program makes an access to the local drive, it will be marked as "removed"
elessair 0:f269e3021894 90 * on the Host computer. This means it is no longer accessible from the Host Computer.
elessair 0:f269e3021894 91 *
elessair 0:f269e3021894 92 * The drive will only re-appear when the microcontroller program exists. Note that if the program does
elessair 0:f269e3021894 93 * not exit, you will need to hold down reset on the mbed Microcontroller to be able to see the drive again!
elessair 0:f269e3021894 94 */
elessair 0:f269e3021894 95 class LocalFileSystem : public FileSystemLike {
elessair 0:f269e3021894 96 // No modifiable state
elessair 0:f269e3021894 97
elessair 0:f269e3021894 98 public:
elessair 0:f269e3021894 99 LocalFileSystem(const char* n) : FileSystemLike(n) {
elessair 0:f269e3021894 100
elessair 0:f269e3021894 101 }
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 virtual FileHandle *open(const char* name, int flags);
elessair 0:f269e3021894 104 virtual int remove(const char *filename);
elessair 0:f269e3021894 105 virtual DirHandle *opendir(const char *name);
elessair 0:f269e3021894 106 };
elessair 0:f269e3021894 107
elessair 0:f269e3021894 108 } // namespace mbed
elessair 0:f269e3021894 109
elessair 0:f269e3021894 110 #endif
elessair 0:f269e3021894 111
elessair 0:f269e3021894 112 #endif
elessair 0:f269e3021894 113
elessair 0:f269e3021894 114 /** @}*/