Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

features/unsupported/fs/fat/FATFileHandle.cpp@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2012 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
elessair 0:f269e3021894 5 * of this software and associated documentation files (the "Software"), to deal
elessair 0:f269e3021894 6 * in the Software without restriction, including without limitation the rights
elessair 0:f269e3021894 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
elessair 0:f269e3021894 8 * copies of the Software, and to permit persons to whom the Software is
elessair 0:f269e3021894 9 * furnished to do so, subject to the following conditions:
elessair 0:f269e3021894 10 *
elessair 0:f269e3021894 11 * The above copyright notice and this permission notice shall be included in
elessair 0:f269e3021894 12 * all copies or substantial portions of the Software.
elessair 0:f269e3021894 13 *
elessair 0:f269e3021894 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
elessair 0:f269e3021894 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
elessair 0:f269e3021894 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
elessair 0:f269e3021894 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
elessair 0:f269e3021894 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
elessair 0:f269e3021894 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
elessair 0:f269e3021894 20 * SOFTWARE.
elessair 0:f269e3021894 21 */
elessair 0:f269e3021894 22 #include "ff.h"
elessair 0:f269e3021894 23 #include "ffconf.h"
elessair 0:f269e3021894 24 #include "mbed_debug.h"
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 #include "FATFileHandle.h"
elessair 0:f269e3021894 27
elessair 0:f269e3021894 28 FATFileHandle::FATFileHandle(FIL fh, PlatformMutex * mutex): _mutex(mutex) {
elessair 0:f269e3021894 29 _fh = fh;
elessair 0:f269e3021894 30 }
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 int FATFileHandle::close() {
elessair 0:f269e3021894 33 lock();
elessair 0:f269e3021894 34 int retval = f_close(&_fh);
elessair 0:f269e3021894 35 unlock();
elessair 0:f269e3021894 36 delete this;
elessair 0:f269e3021894 37 return retval;
elessair 0:f269e3021894 38 }
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 ssize_t FATFileHandle::write(const void* buffer, size_t length) {
elessair 0:f269e3021894 41 lock();
elessair 0:f269e3021894 42 UINT n;
elessair 0:f269e3021894 43 FRESULT res = f_write(&_fh, buffer, length, &n);
elessair 0:f269e3021894 44 if (res) {
elessair 0:f269e3021894 45 debug_if(FFS_DBG, "f_write() failed: %d", res);
elessair 0:f269e3021894 46 unlock();
elessair 0:f269e3021894 47 return -1;
elessair 0:f269e3021894 48 }
elessair 0:f269e3021894 49 unlock();
elessair 0:f269e3021894 50 return n;
elessair 0:f269e3021894 51 }
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 ssize_t FATFileHandle::read(void* buffer, size_t length) {
elessair 0:f269e3021894 54 lock();
elessair 0:f269e3021894 55 debug_if(FFS_DBG, "read(%d)\n", length);
elessair 0:f269e3021894 56 UINT n;
elessair 0:f269e3021894 57 FRESULT res = f_read(&_fh, buffer, length, &n);
elessair 0:f269e3021894 58 if (res) {
elessair 0:f269e3021894 59 debug_if(FFS_DBG, "f_read() failed: %d\n", res);
elessair 0:f269e3021894 60 unlock();
elessair 0:f269e3021894 61 return -1;
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63 unlock();
elessair 0:f269e3021894 64 return n;
elessair 0:f269e3021894 65 }
elessair 0:f269e3021894 66
elessair 0:f269e3021894 67 int FATFileHandle::isatty() {
elessair 0:f269e3021894 68 return 0;
elessair 0:f269e3021894 69 }
elessair 0:f269e3021894 70
elessair 0:f269e3021894 71 off_t FATFileHandle::lseek(off_t position, int whence) {
elessair 0:f269e3021894 72 lock();
elessair 0:f269e3021894 73 if (whence == SEEK_END) {
elessair 0:f269e3021894 74 position += _fh.fsize;
elessair 0:f269e3021894 75 } else if(whence==SEEK_CUR) {
elessair 0:f269e3021894 76 position += _fh.fptr;
elessair 0:f269e3021894 77 }
elessair 0:f269e3021894 78 FRESULT res = f_lseek(&_fh, position);
elessair 0:f269e3021894 79 if (res) {
elessair 0:f269e3021894 80 debug_if(FFS_DBG, "lseek failed: %d\n", res);
elessair 0:f269e3021894 81 unlock();
elessair 0:f269e3021894 82 return -1;
elessair 0:f269e3021894 83 } else {
elessair 0:f269e3021894 84 debug_if(FFS_DBG, "lseek OK, returning %i\n", _fh.fptr);
elessair 0:f269e3021894 85 unlock();
elessair 0:f269e3021894 86 return _fh.fptr;
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88 }
elessair 0:f269e3021894 89
elessair 0:f269e3021894 90 int FATFileHandle::fsync() {
elessair 0:f269e3021894 91 lock();
elessair 0:f269e3021894 92 FRESULT res = f_sync(&_fh);
elessair 0:f269e3021894 93 if (res) {
elessair 0:f269e3021894 94 debug_if(FFS_DBG, "f_sync() failed: %d\n", res);
elessair 0:f269e3021894 95 unlock();
elessair 0:f269e3021894 96 return -1;
elessair 0:f269e3021894 97 }
elessair 0:f269e3021894 98 unlock();
elessair 0:f269e3021894 99 return 0;
elessair 0:f269e3021894 100 }
elessair 0:f269e3021894 101
elessair 0:f269e3021894 102 off_t FATFileHandle::flen() {
elessair 0:f269e3021894 103 lock();
elessair 0:f269e3021894 104 off_t size = _fh.fsize;
elessair 0:f269e3021894 105 unlock();
elessair 0:f269e3021894 106 return size;
elessair 0:f269e3021894 107 }
elessair 0:f269e3021894 108
elessair 0:f269e3021894 109 void FATFileHandle::lock() {
elessair 0:f269e3021894 110 _mutex->lock();
elessair 0:f269e3021894 111 }
elessair 0:f269e3021894 112
elessair 0:f269e3021894 113 void FATFileHandle::unlock() {
elessair 0:f269e3021894 114 _mutex->unlock();
elessair 0:f269e3021894 115 }