tmk_core/tool/mbed/mbed-sdk/libraries/fs/fat/FATFileHandle.cpp

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