Jing Qiu / mbed

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Fork of mbed by gokmen ascioglu

LocalFileSystem.h@1:27d81db81dd7, 2015-03-03 (annotated)

Committer:
Jing_Qiu
Date:
Tue Mar 03 00:55:57 2015 +0000
Revision:
1:27d81db81dd7
Parent:
0:a8fa94490a0a 
revise

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - LocalFileSystem
gokmenascioglu 0:a8fa94490a0a 2 * Copyright (c) 2008-2009 ARM Limited. All rights reserved.
gokmenascioglu 0:a8fa94490a0a 3 */
gokmenascioglu 0:a8fa94490a0a 4
gokmenascioglu 0:a8fa94490a0a 5 #ifndef MBED_LOCALFILESYSTEM_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_LOCALFILESYSTEM_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #include "FileSystemLike.h"
gokmenascioglu 0:a8fa94490a0a 9
gokmenascioglu 0:a8fa94490a0a 10 namespace mbed {
gokmenascioglu 0:a8fa94490a0a 11
gokmenascioglu 0:a8fa94490a0a 12 FILEHANDLE local_file_open(const char* name, int flags);
gokmenascioglu 0:a8fa94490a0a 13
gokmenascioglu 0:a8fa94490a0a 14 class LocalFileHandle : public FileHandle {
gokmenascioglu 0:a8fa94490a0a 15
gokmenascioglu 0:a8fa94490a0a 16 public:
gokmenascioglu 0:a8fa94490a0a 17 LocalFileHandle(FILEHANDLE fh);
gokmenascioglu 0:a8fa94490a0a 18
gokmenascioglu 0:a8fa94490a0a 19 virtual int close();
gokmenascioglu 0:a8fa94490a0a 20
gokmenascioglu 0:a8fa94490a0a 21 virtual ssize_t write(const void *buffer, size_t length);
gokmenascioglu 0:a8fa94490a0a 22
gokmenascioglu 0:a8fa94490a0a 23 virtual ssize_t read(void *buffer, size_t length);
gokmenascioglu 0:a8fa94490a0a 24
gokmenascioglu 0:a8fa94490a0a 25 virtual int isatty();
gokmenascioglu 0:a8fa94490a0a 26
gokmenascioglu 0:a8fa94490a0a 27 virtual off_t lseek(off_t position, int whence);
gokmenascioglu 0:a8fa94490a0a 28
gokmenascioglu 0:a8fa94490a0a 29 virtual int fsync();
gokmenascioglu 0:a8fa94490a0a 30
gokmenascioglu 0:a8fa94490a0a 31 virtual off_t flen();
gokmenascioglu 0:a8fa94490a0a 32
gokmenascioglu 0:a8fa94490a0a 33 protected:
gokmenascioglu 0:a8fa94490a0a 34 FILEHANDLE _fh;
gokmenascioglu 0:a8fa94490a0a 35 int pos;
gokmenascioglu 0:a8fa94490a0a 36 };
gokmenascioglu 0:a8fa94490a0a 37
gokmenascioglu 0:a8fa94490a0a 38 /* Class: LocalFileSystem
gokmenascioglu 0:a8fa94490a0a 39 * A filesystem for accessing the local mbed Microcontroller USB disk drive
gokmenascioglu 0:a8fa94490a0a 40 *
gokmenascioglu 0:a8fa94490a0a 41 * This allows programs to read and write files on the same disk drive that is used to program the
gokmenascioglu 0:a8fa94490a0a 42 * mbed Microcontroller. Once created, the standard C file access functions are used to open,
gokmenascioglu 0:a8fa94490a0a 43 * read and write files.
gokmenascioglu 0:a8fa94490a0a 44 *
gokmenascioglu 0:a8fa94490a0a 45 * Example:
gokmenascioglu 0:a8fa94490a0a 46 * > #include "mbed.h"
gokmenascioglu 0:a8fa94490a0a 47 * >
gokmenascioglu 0:a8fa94490a0a 48 * > LocalFileSystem local("local"); // Create the local filesystem under the name "local"
gokmenascioglu 0:a8fa94490a0a 49 * >
gokmenascioglu 0:a8fa94490a0a 50 * > int main() {
gokmenascioglu 0:a8fa94490a0a 51 * > FILE *fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
gokmenascioglu 0:a8fa94490a0a 52 * > fprintf(fp, "Hello World!");
gokmenascioglu 0:a8fa94490a0a 53 * > fclose(fp);
gokmenascioglu 0:a8fa94490a0a 54 * > remove("/local/out.txt"); // Removes the file "out.txt" from the local file system
gokmenascioglu 0:a8fa94490a0a 55 * >
gokmenascioglu 0:a8fa94490a0a 56 * > DIR *d = opendir("/local"); // Opens the root directory of the local file system
gokmenascioglu 0:a8fa94490a0a 57 * > struct dirent *p;
gokmenascioglu 0:a8fa94490a0a 58 * > while((p = readdir(d)) != NULL) { // Print the names of the files in the local file system
gokmenascioglu 0:a8fa94490a0a 59 * > printf("%s\n", p->d_name); // to stdout.
gokmenascioglu 0:a8fa94490a0a 60 * > }
gokmenascioglu 0:a8fa94490a0a 61 * > closedir(d);
gokmenascioglu 0:a8fa94490a0a 62 * > }
gokmenascioglu 0:a8fa94490a0a 63 *
gokmenascioglu 0:a8fa94490a0a 64 * Implementation Notes:
gokmenascioglu 0:a8fa94490a0a 65 * If the microcontroller program makes an access to the local drive, it will be marked as "removed"
gokmenascioglu 0:a8fa94490a0a 66 * on the Host computer. This means it is no longer accessible from the Host Computer.
gokmenascioglu 0:a8fa94490a0a 67 *
gokmenascioglu 0:a8fa94490a0a 68 * The drive will only re-appear when the microcontroller program exists. Note that if the program does
gokmenascioglu 0:a8fa94490a0a 69 * not exit, you will need to hold down reset on the mbed Microcontroller to be able to see the drive again!
gokmenascioglu 0:a8fa94490a0a 70 */
gokmenascioglu 0:a8fa94490a0a 71 class LocalFileSystem : public FileSystemLike {
gokmenascioglu 0:a8fa94490a0a 72
gokmenascioglu 0:a8fa94490a0a 73 public:
gokmenascioglu 0:a8fa94490a0a 74
gokmenascioglu 0:a8fa94490a0a 75 LocalFileSystem(const char* n) : FileSystemLike(n) {
gokmenascioglu 0:a8fa94490a0a 76
gokmenascioglu 0:a8fa94490a0a 77 }
gokmenascioglu 0:a8fa94490a0a 78
gokmenascioglu 0:a8fa94490a0a 79 virtual FileHandle *open(const char* name, int flags);
gokmenascioglu 0:a8fa94490a0a 80 virtual int remove(const char *filename);
gokmenascioglu 0:a8fa94490a0a 81 virtual DirHandle *opendir(const char *name);
gokmenascioglu 0:a8fa94490a0a 82 };
gokmenascioglu 0:a8fa94490a0a 83
gokmenascioglu 0:a8fa94490a0a 84 } // namespace mbed
gokmenascioglu 0:a8fa94490a0a 85
gokmenascioglu 0:a8fa94490a0a 86 #endif