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 #if !_FS_READONLY
00040     UINT n;
00041     FRESULT res = f_write(&_fh, buffer, length, &n);
00042     if (res) {
00043         debug_if(FFS_DBG, "f_write() failed: %d", res);
00044         return -1;
00045     }
00046     return n;
00047 #else
00048     return -1;
00049 #endif
00050 }
00051 
00052 ssize_t FATFileHandle::read(void* buffer, size_t length) {
00053     debug_if(FFS_DBG, "read(%d)\n", length);
00054     UINT n;
00055     FRESULT res = f_read(&_fh, buffer, length, &n);
00056     if (res) {
00057         debug_if(FFS_DBG, "f_read() failed: %d\n", res);
00058         return -1;
00059     }
00060     return n;
00061 }
00062 
00063 int FATFileHandle::isatty() {
00064     return 0;
00065 }
00066 
00067 off_t FATFileHandle::lseek(off_t position, int whence) {
00068     if (whence == SEEK_END) {
00069         position += _fh.fsize;
00070     } else if(whence==SEEK_CUR) {
00071         position += _fh.fptr;
00072     }
00073     FRESULT res = f_lseek(&_fh, position);
00074     if (res) {
00075         debug_if(FFS_DBG, "lseek failed: %d\n", res);
00076         return -1;
00077     } else {
00078         debug_if(FFS_DBG, "lseek OK, returning %i\n", _fh.fptr);
00079         return _fh.fptr;
00080     }
00081 }
00082 
00083 int FATFileHandle::fsync() {
00084 #if !_FS_READONLY
00085     FRESULT res = f_sync(&_fh);
00086     if (res) {
00087         debug_if(FFS_DBG, "f_sync() failed: %d\n", res);
00088         return -1;
00089     }
00090     return 0;
00091 #else
00092     return -1;
00093 #endif
00094 }
00095 
00096 off_t FATFileHandle::flen() {
00097     return _fh.fsize;
00098 }