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) {
00029     _fh = fh;
00030 }
00031 
00032 int FATFileHandle::close() {
00033     int retval = f_close(&_fh);
00034     delete this;
00035     return retval;
00036 }
00037 
00038 ssize_t FATFileHandle::write(const void* buffer, size_t length) {
00039     UINT n;
00040     FRESULT res = f_write(&_fh, buffer, length, &n);
00041     if (res) {
00042         debug_if(FFS_DBG, "f_write() failed: %d", res);
00043         return -1;
00044     }
00045     return n;
00046 }
00047 
00048 ssize_t FATFileHandle::read(void* buffer, size_t length) {
00049     debug_if(FFS_DBG, "read(%d)\n", length);
00050     UINT n;
00051     FRESULT res = f_read(&_fh, buffer, length, &n);
00052     if (res) {
00053         debug_if(FFS_DBG, "f_read() failed: %d\n", res);
00054         return -1;
00055     }
00056     return n;
00057 }
00058 
00059 int FATFileHandle::isatty() {
00060     return 0;
00061 }
00062 
00063 off_t FATFileHandle::lseek(off_t position, int whence) {
00064     if (whence == SEEK_END) {
00065         position += _fh.fsize;
00066     } else if(whence==SEEK_CUR) {
00067         position += _fh.fptr;
00068     }
00069     FRESULT res = f_lseek(&_fh, position);
00070     if (res) {
00071         debug_if(FFS_DBG, "lseek failed: %d\n", res);
00072         return -1;
00073     } else {
00074         debug_if(FFS_DBG, "lseek OK, returning %i\n", _fh.fptr);
00075         return _fh.fptr;
00076     }
00077 }
00078 
00079 int FATFileHandle::fsync() {
00080     FRESULT res = f_sync(&_fh);
00081     if (res) {
00082         debug_if(FFS_DBG, "f_sync() failed: %d\n", res);
00083         return -1;
00084     }
00085     return 0;
00086 }
00087 
00088 off_t FATFileHandle::flen() {
00089     return _fh.fsize;
00090 }