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mbed-os/features/storage/filesystem/fat/FATFileSystem.h

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/* 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.
*/
/** \addtogroup storage */
/** @{*/
#ifndef MBED_FATFILESYSTEM_H
#define MBED_FATFILESYSTEM_H
#include "FileSystem.h"
#include "BlockDevice.h"
#include "FileHandle.h"
#include "ff.h"
#include <stdint.h>
#include "PlatformMutex.h"
namespace mbed {
/**
* FAT file system based on ChaN's FAT file system library v0.8
*
* Synchronization level: Thread safe
*/
class FATFileSystem : public FileSystem {
public:
/** Lifetime of the FAT file system.
*
* @param name Name of the file system in the tree.
* @param bd Block device to mount. Mounted immediately if not NULL.
*/
FATFileSystem(const char *name = NULL, BlockDevice *bd = NULL);
virtual ~FATFileSystem();
/** Format a logical drive, FDISK partitioning rule.
*
* The block device to format should be mounted when this function is called.
*
* @param bd
* This is the block device that will be formatted.
*
* @param cluster_size
* This is the number of bytes per cluster. A larger cluster size decreases
* the overhead of the FAT table, but also increases the minimum file size. The
* cluster size must be a multiple of the underlying device's allocation unit
* and is currently limited to a max of 32,768 bytes. If the cluster size is set to zero, a cluster size
* is determined from the device's allocation unit. Defaults to zero.
*
* @return 0 on success, negative error code on failure.
*/
static int format(BlockDevice *bd, bd_size_t cluster_size = 0);
/** Mount a file system to a block device.
*
* @param bd Block device to mount to.
* @return 0 on success, negative error code on failure.
*/
virtual int mount(BlockDevice *bd);
/** Unmount a file system from the underlying block device.
*
* @return 0 on success, negative error code on failure.
*/
virtual int unmount();
/** Reformat a file system, results in an empty and mounted file system.
*
* @param bd
* Block device to reformat and mount. If NULL, the mounted
* Block device is used.
* Note: If mount fails, bd must be provided.
* Default: NULL
*
* @param allocation_unit
* This is the number of bytes per cluster size. The valid value is N
* times the sector size. N is a power of 2, from 1 to 128, for the FAT
* volume, and up to 16MiB for the exFAT volume. If zero is given,
* the default allocation unit size is selected by the underlying
* file system, which depends on the volume size.
*
* @return 0 on success, negative error code on failure.
*/
virtual int reformat(BlockDevice *bd, int allocation_unit);
/** Reformat a file system, results in an empty and mounted file system.
*
* @param bd Block device to reformat and mount. If NULL, the mounted
* Block device is used.
* Note: If mount fails, bd must be provided.
* Default: NULL
* @return 0 on success, negative error code on failure.
*/
virtual int reformat(BlockDevice *bd = NULL)
{
// Required for virtual inheritance shenanigans.
return reformat(bd, 0);
}
/** Remove a file from the file system.
*
* @param path The name of the file to remove.
* @return 0 on success, negative error code on failure.
*/
virtual int remove(const char *path);
/** Rename a file in the file system.
*
* @param path The current name of the file to rename.
* @param newpath The new name of the file.
* @return 0 on success, negative error code on failure.
*/
virtual int rename(const char *path, const char *newpath);
/** Store information about the file in a stat structure.
*
* @param path The name of the file to store information about.
* @param st The stat buffer to write to.
* @return 0 on success, negative error code on failure.
*/
virtual int stat(const char *path, struct stat *st);
/** Create a directory in the file system.
*
* @param path The name of the directory to create.
* @param mode The permissions with which to create the directory.
* @return 0 on success, negative error code on failure.
*/
virtual int mkdir(const char *path, mode_t mode);
/** Store information about the mounted file system in a statvfs structure.
*
* @param path The name of the file to store information about.
* @param buf The stat buffer to write to.
* @return 0 on success, negative error code on failure.
*/
virtual int statvfs(const char *path, struct statvfs *buf);
protected:
#if !(DOXYGEN_ONLY)
/** Open a file on the file system.
*
* @param file Destination for the handle to a newly created file.
* @param path The name of the file to open.
* @param flags The flags that trigger opening of the file. These flags are O_RDONLY, O_WRONLY, and O_RDWR,
* with an O_CREAT, O_TRUNC, or O_APPEND bitwise OR operator.
* @return 0 on success, negative error code on failure.
*/
virtual int file_open(fs_file_t *file, const char *path, int flags);
/** Close a file
*
* @param file File handle.
* @return 0 on success, negative error code on failure.
*/
virtual int file_close(fs_file_t file);
/** Read the contents of a file into a buffer.
*
* @param file File handle.
* @param buffer The buffer to read into.
* @param len The number of bytes to read.
* @return The number of bytes read; 0 at the end of the file, negative error on failure.
*/
virtual ssize_t file_read(fs_file_t file, void *buffer, size_t len);
/** Write the contents of a buffer to a file.
*
* @param file File handle.
* @param buffer The buffer to write from.
* @param len The number of bytes to write.
* @return The number of bytes written, negative error on failure.
*/
virtual ssize_t file_write(fs_file_t file, const void *buffer, size_t len);
/** Flush any buffers associated with the file.
*
* @param file File handle.
* @return 0 on success, negative error code on failure.
*/
virtual int file_sync(fs_file_t file);
/** Move the file position to a given offset from a given location
*
* @param file File handle.
* @param offset The offset from whence to move to.
* @param whence The start of where to seek.
* SEEK_SET to start from the beginning of the file,
* SEEK_CUR to start from the current position in the file,
* SEEK_END to start from the end of the file.
* @return The new offset of the file.
*/
virtual off_t file_seek(fs_file_t file, off_t offset, int whence);
/** Get the file position of the file.
*
* @param file File handle.
* @return The current offset in the file.
*/
virtual off_t file_tell(fs_file_t file);
/** Get the size of the file.
*
* @param file File handle.
* @return Size of the file in bytes.
*/
virtual off_t file_size(fs_file_t file);
/** Truncate or extend a file.
*
* The file's length is set to the specified value. The seek pointer is
* not changed. If the file is extended, the extended area appears as if
* it were zero-filled.
*
* @param file File handle.
* @param length The requested new length for the file.
*
* @return 0 on success, negative error code on failure.
*/
virtual int file_truncate(mbed::fs_file_t file, off_t length);
/** Open a directory on the file system.
*
* @param dir Destination for the handle to the directory.
* @param path Name of the directory to open.
* @return 0 on success, negative error code on failure.
*/
virtual int dir_open(fs_dir_t *dir, const char *path);
/** Close a directory
*
* @param dir Dir handle.
* @return 0 on success, negative error code on failure.
*/
virtual int dir_close(fs_dir_t dir);
/** Read the next directory entry
*
* @param dir Dir handle.
* @param ent The directory entry to fill out.
* @return 1 on reading a filename, 0 at the end of the directory, negative error on failure.
*/
virtual ssize_t dir_read(fs_dir_t dir, struct dirent *ent);
/** Set the current position of the directory.
*
* @param dir Dir handle.
* @param offset Offset of the location to seek to.
* Must be a value returned by dir_tell.
*/
virtual void dir_seek(fs_dir_t dir, off_t offset);
/** Get the current position of the directory.
*
* @param dir Dir handle.
* @return Directory position, which can be passed to dir_rewind.
*/
virtual off_t dir_tell(fs_dir_t dir);
/** Rewind the current position to the beginning of the directory.
*
* @param dir Dir handle.
*/
virtual void dir_rewind(fs_dir_t dir);
#endif //!(DOXYGEN_ONLY)
private:
FATFS _fs; // Work area (file system object) for logical drive.
char _fsid[sizeof("0:")];
int _id;
protected:
virtual void lock();
virtual void unlock();
virtual int mount(BlockDevice *bd, bool mount);
};
} // namespace mbed
// Added "using" for backwards compatibility.
#ifndef MBED_NO_GLOBAL_USING_DIRECTIVE
using mbed::FATFileSystem;
#endif
#endif
/** @}*/
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