FATFileHandle.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #include "ff.h"
00023 #include "ffconf.h"
00024 #include "mbed_debug.h"
00025 
00026 #include "FATFileHandle.h"
00027 
00028 FATFileHandle::FATFileHandle(FIL fh, PlatformMutex * mutex): _mutex(mutex) {
00029     _fh = fh;
00030 }
00031 
00032 int FATFileHandle::close() {
00033     lock();
00034     int retval = f_close(&_fh);
00035     unlock();
00036     delete this;
00037     return retval;
00038 }
00039 
00040 ssize_t FATFileHandle::write(const void* buffer, size_t length) {
00041     lock();
00042     UINT n;
00043     FRESULT res = f_write(&_fh, buffer, length, &n);
00044     if (res) {
00045         debug_if(FFS_DBG, "f_write() failed: %d", res);
00046         unlock();
00047         return -1;
00048     }
00049     unlock();
00050     return n;
00051 }
00052 
00053 ssize_t FATFileHandle::read(void* buffer, size_t length) {
00054     lock();
00055     debug_if(FFS_DBG, "read(%d)\n", length);
00056     UINT n;
00057     FRESULT res = f_read(&_fh, buffer, length, &n);
00058     if (res) {
00059         debug_if(FFS_DBG, "f_read() failed: %d\n", res);
00060         unlock();
00061         return -1;
00062     }
00063     unlock();
00064     return n;
00065 }
00066 
00067 int FATFileHandle::isatty() {
00068     return 0;
00069 }
00070 
00071 off_t FATFileHandle::lseek(off_t position, int whence) {
00072     lock();
00073     if (whence == SEEK_END) {
00074         position += _fh.fsize;
00075     } else if(whence==SEEK_CUR) {
00076         position += _fh.fptr;
00077     }
00078     FRESULT res = f_lseek(&_fh, position);
00079     if (res) {
00080         debug_if(FFS_DBG, "lseek failed: %d\n", res);
00081         unlock();
00082         return -1;
00083     } else {
00084         debug_if(FFS_DBG, "lseek OK, returning %i\n", _fh.fptr);
00085         unlock();
00086         return _fh.fptr;
00087     }
00088 }
00089 
00090 int FATFileHandle::fsync() {
00091     lock();
00092     FRESULT res = f_sync(&_fh);
00093     if (res) {
00094         debug_if(FFS_DBG, "f_sync() failed: %d\n", res);
00095         unlock();
00096         return -1;
00097     }
00098     unlock();
00099     return 0;
00100 }
00101 
00102 off_t FATFileHandle::flen() {
00103     lock();
00104     off_t size = _fh.fsize;
00105     unlock();
00106     return size;
00107 }
00108 
00109 void FATFileHandle::lock() {
00110     _mutex->lock();
00111 }
00112 
00113 void FATFileHandle::unlock() {
00114     _mutex->unlock();
00115 }