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FATFileSystem/FATFileSystem.cpp@0:c9f6f3f0cd78, 2020-01-28 (annotated)

Committer:: adrevong
Date:: Tue Jan 28 11:11:57 2020 +0000
Revision:: 0:c9f6f3f0cd78

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User	Revision	Line number	New contents of line
adrevong	0:c9f6f3f0cd78	1	/* mbed Microcontroller Library
adrevong	0:c9f6f3f0cd78	2	* Copyright (c) 2006-2012 ARM Limited
adrevong	0:c9f6f3f0cd78	3	*
adrevong	0:c9f6f3f0cd78	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
adrevong	0:c9f6f3f0cd78	5	* of this software and associated documentation files (the "Software"), to deal
adrevong	0:c9f6f3f0cd78	6	* in the Software without restriction, including without limitation the rights
adrevong	0:c9f6f3f0cd78	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
adrevong	0:c9f6f3f0cd78	8	* copies of the Software, and to permit persons to whom the Software is
adrevong	0:c9f6f3f0cd78	9	* furnished to do so, subject to the following conditions:
adrevong	0:c9f6f3f0cd78	10	*
adrevong	0:c9f6f3f0cd78	11	* The above copyright notice and this permission notice shall be included in
adrevong	0:c9f6f3f0cd78	12	* all copies or substantial portions of the Software.
adrevong	0:c9f6f3f0cd78	13	*
adrevong	0:c9f6f3f0cd78	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
adrevong	0:c9f6f3f0cd78	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
adrevong	0:c9f6f3f0cd78	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
adrevong	0:c9f6f3f0cd78	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
adrevong	0:c9f6f3f0cd78	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
adrevong	0:c9f6f3f0cd78	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
adrevong	0:c9f6f3f0cd78	20	* SOFTWARE.
adrevong	0:c9f6f3f0cd78	21	*/
adrevong	0:c9f6f3f0cd78	22	#include "mbed.h"
adrevong	0:c9f6f3f0cd78	23
adrevong	0:c9f6f3f0cd78	24	#include "ffconf.h"
adrevong	0:c9f6f3f0cd78	25	#include "mbed_debug.h"
adrevong	0:c9f6f3f0cd78	26
adrevong	0:c9f6f3f0cd78	27	#include "FATFileSystem.h"
adrevong	0:c9f6f3f0cd78	28	#include "FATFileHandle.h"
adrevong	0:c9f6f3f0cd78	29	#include "FATDirHandle.h"
adrevong	0:c9f6f3f0cd78	30
adrevong	0:c9f6f3f0cd78	31	DWORD get_fattime(void) {
adrevong	0:c9f6f3f0cd78	32	time_t rawtime;
adrevong	0:c9f6f3f0cd78	33	time(&rawtime);
adrevong	0:c9f6f3f0cd78	34	struct tm *ptm = localtime(&rawtime);
adrevong	0:c9f6f3f0cd78	35	return (DWORD)(ptm->tm_year - 80) << 25
adrevong	0:c9f6f3f0cd78	36	\| (DWORD)(ptm->tm_mon + 1 ) << 21
adrevong	0:c9f6f3f0cd78	37	\| (DWORD)(ptm->tm_mday ) << 16
adrevong	0:c9f6f3f0cd78	38	\| (DWORD)(ptm->tm_hour ) << 11
adrevong	0:c9f6f3f0cd78	39	\| (DWORD)(ptm->tm_min ) << 5
adrevong	0:c9f6f3f0cd78	40	\| (DWORD)(ptm->tm_sec/2 );
adrevong	0:c9f6f3f0cd78	41	}
adrevong	0:c9f6f3f0cd78	42
adrevong	0:c9f6f3f0cd78	43	FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
adrevong	0:c9f6f3f0cd78	44
adrevong	0:c9f6f3f0cd78	45	FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
adrevong	0:c9f6f3f0cd78	46	debug_if(FFS_DBG, "FATFileSystem(%s)\n", n);
adrevong	0:c9f6f3f0cd78	47	for(int i=0; i<_VOLUMES; i++) {
adrevong	0:c9f6f3f0cd78	48	if(_ffs[i] == 0) {
adrevong	0:c9f6f3f0cd78	49	_ffs[i] = this;
adrevong	0:c9f6f3f0cd78	50	_fsid[0] = '0' + i;
adrevong	0:c9f6f3f0cd78	51	_fsid[1] = '\0';
adrevong	0:c9f6f3f0cd78	52	debug_if(FFS_DBG, "Mounting [%s] on ffs drive [%s]\n", getName(), _fsid);
adrevong	0:c9f6f3f0cd78	53	f_mount(&_fs, _fsid, 0);
adrevong	0:c9f6f3f0cd78	54	return;
adrevong	0:c9f6f3f0cd78	55	}
adrevong	0:c9f6f3f0cd78	56	}
adrevong	0:c9f6f3f0cd78	57	error("Couldn't create %s in FATFileSystem::FATFileSystem\n", n);
adrevong	0:c9f6f3f0cd78	58	}
adrevong	0:c9f6f3f0cd78	59
adrevong	0:c9f6f3f0cd78	60	FATFileSystem::~FATFileSystem() {
adrevong	0:c9f6f3f0cd78	61	for (int i=0; i<_VOLUMES; i++) {
adrevong	0:c9f6f3f0cd78	62	if (_ffs[i] == this) {
adrevong	0:c9f6f3f0cd78	63	_ffs[i] = 0;
adrevong	0:c9f6f3f0cd78	64	f_mount(NULL, _fsid, 0);
adrevong	0:c9f6f3f0cd78	65	}
adrevong	0:c9f6f3f0cd78	66	}
adrevong	0:c9f6f3f0cd78	67	}
adrevong	0:c9f6f3f0cd78	68
adrevong	0:c9f6f3f0cd78	69	FileHandle FATFileSystem::open(const char name, int flags) {
adrevong	0:c9f6f3f0cd78	70	debug_if(FFS_DBG, "open(%s) on filesystem [%s], drv [%s]\n", name, getName(), _fsid);
adrevong	0:c9f6f3f0cd78	71	char n[64];
adrevong	0:c9f6f3f0cd78	72	sprintf(n, "%s:/%s", _fsid, name);
adrevong	0:c9f6f3f0cd78	73
adrevong	0:c9f6f3f0cd78	74	/* POSIX flags -> FatFS open mode */
adrevong	0:c9f6f3f0cd78	75	BYTE openmode;
adrevong	0:c9f6f3f0cd78	76	if (flags & O_RDWR) {
adrevong	0:c9f6f3f0cd78	77	openmode = FA_READ\|FA_WRITE;
adrevong	0:c9f6f3f0cd78	78	} else if(flags & O_WRONLY) {
adrevong	0:c9f6f3f0cd78	79	openmode = FA_WRITE;
adrevong	0:c9f6f3f0cd78	80	} else {
adrevong	0:c9f6f3f0cd78	81	openmode = FA_READ;
adrevong	0:c9f6f3f0cd78	82	}
adrevong	0:c9f6f3f0cd78	83	if(flags & O_CREAT) {
adrevong	0:c9f6f3f0cd78	84	if(flags & O_TRUNC) {
adrevong	0:c9f6f3f0cd78	85	openmode \|= FA_CREATE_ALWAYS;
adrevong	0:c9f6f3f0cd78	86	} else {
adrevong	0:c9f6f3f0cd78	87	openmode \|= FA_OPEN_ALWAYS;
adrevong	0:c9f6f3f0cd78	88	}
adrevong	0:c9f6f3f0cd78	89	}
adrevong	0:c9f6f3f0cd78	90
adrevong	0:c9f6f3f0cd78	91	FIL fh;
adrevong	0:c9f6f3f0cd78	92	FRESULT res = f_open(&fh, n, openmode);
adrevong	0:c9f6f3f0cd78	93	if (res) {
adrevong	0:c9f6f3f0cd78	94	debug_if(FFS_DBG, "f_open('w') failed: %d\n", res);
adrevong	0:c9f6f3f0cd78	95	return NULL;
adrevong	0:c9f6f3f0cd78	96	}
adrevong	0:c9f6f3f0cd78	97	if (flags & O_APPEND) {
adrevong	0:c9f6f3f0cd78	98	f_lseek(&fh, fh.fsize);
adrevong	0:c9f6f3f0cd78	99	}
adrevong	0:c9f6f3f0cd78	100	return new FATFileHandle(fh);
adrevong	0:c9f6f3f0cd78	101	}
adrevong	0:c9f6f3f0cd78	102
adrevong	0:c9f6f3f0cd78	103	int FATFileSystem::open(FileHandle *file, const char name, int flags) {
adrevong	0:c9f6f3f0cd78	104	FileHandle *temp = open(name, flags);
adrevong	0:c9f6f3f0cd78	105	if (!temp) {
adrevong	0:c9f6f3f0cd78	106	return -1;
adrevong	0:c9f6f3f0cd78	107	}
adrevong	0:c9f6f3f0cd78	108
adrevong	0:c9f6f3f0cd78	109	*file = temp;
adrevong	0:c9f6f3f0cd78	110	return 0;
adrevong	0:c9f6f3f0cd78	111	}
adrevong	0:c9f6f3f0cd78	112
adrevong	0:c9f6f3f0cd78	113	int FATFileSystem::remove(const char *filename) {
adrevong	0:c9f6f3f0cd78	114	FRESULT res = f_unlink(filename);
adrevong	0:c9f6f3f0cd78	115	if (res) {
adrevong	0:c9f6f3f0cd78	116	debug_if(FFS_DBG, "f_unlink() failed: %d\n", res);
adrevong	0:c9f6f3f0cd78	117	return -1;
adrevong	0:c9f6f3f0cd78	118	}
adrevong	0:c9f6f3f0cd78	119	return 0;
adrevong	0:c9f6f3f0cd78	120	}
adrevong	0:c9f6f3f0cd78	121
adrevong	0:c9f6f3f0cd78	122	int FATFileSystem::rename(const char oldname, const char newname) {
adrevong	0:c9f6f3f0cd78	123	FRESULT res = f_rename(oldname, newname);
adrevong	0:c9f6f3f0cd78	124	if (res) {
adrevong	0:c9f6f3f0cd78	125	debug_if(FFS_DBG, "f_rename() failed: %d\n", res);
adrevong	0:c9f6f3f0cd78	126	return -1;
adrevong	0:c9f6f3f0cd78	127	}
adrevong	0:c9f6f3f0cd78	128	return 0;
adrevong	0:c9f6f3f0cd78	129	}
adrevong	0:c9f6f3f0cd78	130
adrevong	0:c9f6f3f0cd78	131	int FATFileSystem::format() {
adrevong	0:c9f6f3f0cd78	132	FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
adrevong	0:c9f6f3f0cd78	133	if (res) {
adrevong	0:c9f6f3f0cd78	134	debug_if(FFS_DBG, "f_mkfs() failed: %d\n", res);
adrevong	0:c9f6f3f0cd78	135	return -1;
adrevong	0:c9f6f3f0cd78	136	}
adrevong	0:c9f6f3f0cd78	137	return 0;
adrevong	0:c9f6f3f0cd78	138	}
adrevong	0:c9f6f3f0cd78	139
adrevong	0:c9f6f3f0cd78	140	DirHandle FATFileSystem::opendir(const char name) {
adrevong	0:c9f6f3f0cd78	141	FATFS_DIR dir;
adrevong	0:c9f6f3f0cd78	142	FRESULT res = f_opendir(&dir, name);
adrevong	0:c9f6f3f0cd78	143	if (res != 0) {
adrevong	0:c9f6f3f0cd78	144	return NULL;
adrevong	0:c9f6f3f0cd78	145	}
adrevong	0:c9f6f3f0cd78	146	return new FATDirHandle(dir);
adrevong	0:c9f6f3f0cd78	147	}
adrevong	0:c9f6f3f0cd78	148
adrevong	0:c9f6f3f0cd78	149	int FATFileSystem::open(DirHandle *dir, const char name) {
adrevong	0:c9f6f3f0cd78	150	DirHandle *temp = opendir(name);
adrevong	0:c9f6f3f0cd78	151	if (!temp) {
adrevong	0:c9f6f3f0cd78	152	return -1;
adrevong	0:c9f6f3f0cd78	153	}
adrevong	0:c9f6f3f0cd78	154
adrevong	0:c9f6f3f0cd78	155	*dir = temp;
adrevong	0:c9f6f3f0cd78	156	return 0;
adrevong	0:c9f6f3f0cd78	157	}
adrevong	0:c9f6f3f0cd78	158
adrevong	0:c9f6f3f0cd78	159	int FATFileSystem::mkdir(const char *name, mode_t mode) {
adrevong	0:c9f6f3f0cd78	160	FRESULT res = f_mkdir(name);
adrevong	0:c9f6f3f0cd78	161	return res == 0 ? 0 : -1;
adrevong	0:c9f6f3f0cd78	162	}
adrevong	0:c9f6f3f0cd78	163
adrevong	0:c9f6f3f0cd78	164	int FATFileSystem::mount() {
adrevong	0:c9f6f3f0cd78	165	FRESULT res = f_mount(&_fs, _fsid, 1);
adrevong	0:c9f6f3f0cd78	166	return res == 0 ? 0 : -1;
adrevong	0:c9f6f3f0cd78	167	}
adrevong	0:c9f6f3f0cd78	168
adrevong	0:c9f6f3f0cd78	169	int FATFileSystem::unmount() {
adrevong	0:c9f6f3f0cd78	170	if (disk_sync())
adrevong	0:c9f6f3f0cd78	171	return -1;
adrevong	0:c9f6f3f0cd78	172	FRESULT res = f_mount(NULL, _fsid, 0);
adrevong	0:c9f6f3f0cd78	173	return res == 0 ? 0 : -1;
adrevong	0:c9f6f3f0cd78	174	}

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Type:	Library
Created:	28 Jan 2020
Imports:	18
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	62

FATFileSystem/FATFileSystem.cpp@0:c9f6f3f0cd78, 2020-01-28 (annotated)

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