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 
00025 #include "FATFileHandle.h"
00026 
00027 
00028 
00029 FATFileHandle::FATFileHandle(FIL fh) {
00030     _fh = fh;
00031 }
00032 
00033 int FATFileHandle::close() {
00034     int retval = f_close(&_fh);
00035     delete this;
00036     return retval;
00037 }
00038 
00039 ssize_t FATFileHandle::write(const void* buffer, size_t length) {
00040     UINT n;
00041     FRESULT res = f_write(&_fh, buffer, length, &n);
00042     if (res) { 
00043         return -1;
00044     }
00045     return n;
00046 }
00047         
00048 ssize_t FATFileHandle::read(void* buffer, size_t length) {
00049     UINT n;
00050     FRESULT res = f_read(&_fh, buffer, length, &n);
00051     if (res) {
00052         return -1;
00053     }
00054     return n;
00055 }
00056 
00057 int FATFileHandle::isatty() {
00058     return 0;
00059 }
00060 
00061 off_t FATFileHandle::lseek(off_t position, int whence) {
00062     if (whence == SEEK_END) {
00063         position += _fh.fsize;
00064     } else if(whence==SEEK_CUR) {
00065         position += _fh.fptr;
00066     }
00067     FRESULT res = f_lseek(&_fh, position);
00068     if (res) {
00069         return -1;
00070     } else {
00071         return _fh.fptr;
00072     }
00073 }
00074 
00075 int FATFileHandle::fsync() {
00076     FRESULT res = f_sync(&_fh);
00077     if (res) {
00078         return -1;
00079     }
00080     return 0;
00081 }
00082 
00083 off_t FATFileHandle::flen() {
00084     return _fh.fsize;
00085 }