tmk_core/tool/mbed/mbed-sdk/libraries/mbed/api/LocalFileSystem.h

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