Madeline Kistler / SDFileSystem2

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FATFileSystem/FATFileHandle.cpp@0:812e8b0b2832, 2020-11-17 (annotated)

Committer:
mkistler
Date:
Tue Nov 17 20:30:08 2020 +0000
Revision:
0:812e8b0b2832
Final draft.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mkistler 0:812e8b0b2832 1 /* mbed Microcontroller Library
mkistler 0:812e8b0b2832 2 * Copyright (c) 2006-2012 ARM Limited
mkistler 0:812e8b0b2832 3 *
mkistler 0:812e8b0b2832 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mkistler 0:812e8b0b2832 5 * of this software and associated documentation files (the "Software"), to deal
mkistler 0:812e8b0b2832 6 * in the Software without restriction, including without limitation the rights
mkistler 0:812e8b0b2832 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mkistler 0:812e8b0b2832 8 * copies of the Software, and to permit persons to whom the Software is
mkistler 0:812e8b0b2832 9 * furnished to do so, subject to the following conditions:
mkistler 0:812e8b0b2832 10 *
mkistler 0:812e8b0b2832 11 * The above copyright notice and this permission notice shall be included in
mkistler 0:812e8b0b2832 12 * all copies or substantial portions of the Software.
mkistler 0:812e8b0b2832 13 *
mkistler 0:812e8b0b2832 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mkistler 0:812e8b0b2832 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mkistler 0:812e8b0b2832 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mkistler 0:812e8b0b2832 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mkistler 0:812e8b0b2832 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mkistler 0:812e8b0b2832 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mkistler 0:812e8b0b2832 20 * SOFTWARE.
mkistler 0:812e8b0b2832 21 */
mkistler 0:812e8b0b2832 22 #include "ff.h"
mkistler 0:812e8b0b2832 23 #include "ffconf.h"
mkistler 0:812e8b0b2832 24 #include "mbed_debug.h"
mkistler 0:812e8b0b2832 25
mkistler 0:812e8b0b2832 26 #include "FATFileHandle.h"
mkistler 0:812e8b0b2832 27
mkistler 0:812e8b0b2832 28 FATFileHandle::FATFileHandle(FIL fh) {
mkistler 0:812e8b0b2832 29 _fh = fh;
mkistler 0:812e8b0b2832 30 }
mkistler 0:812e8b0b2832 31
mkistler 0:812e8b0b2832 32 int FATFileHandle::close() {
mkistler 0:812e8b0b2832 33 int retval = f_close(&_fh);
mkistler 0:812e8b0b2832 34 delete this;
mkistler 0:812e8b0b2832 35 return retval;
mkistler 0:812e8b0b2832 36 }
mkistler 0:812e8b0b2832 37
mkistler 0:812e8b0b2832 38 ssize_t FATFileHandle::write(const void* buffer, size_t length) {
mkistler 0:812e8b0b2832 39 UINT n;
mkistler 0:812e8b0b2832 40 FRESULT res = f_write(&_fh, buffer, length, &n);
mkistler 0:812e8b0b2832 41 if (res) {
mkistler 0:812e8b0b2832 42 debug_if(FFS_DBG, "f_write() failed: %d", res);
mkistler 0:812e8b0b2832 43 return -1;
mkistler 0:812e8b0b2832 44 }
mkistler 0:812e8b0b2832 45 return n;
mkistler 0:812e8b0b2832 46 }
mkistler 0:812e8b0b2832 47
mkistler 0:812e8b0b2832 48 ssize_t FATFileHandle::read(void* buffer, size_t length) {
mkistler 0:812e8b0b2832 49 debug_if(FFS_DBG, "read(%d)\n", length);
mkistler 0:812e8b0b2832 50 UINT n;
mkistler 0:812e8b0b2832 51 FRESULT res = f_read(&_fh, buffer, length, &n);
mkistler 0:812e8b0b2832 52 if (res) {
mkistler 0:812e8b0b2832 53 debug_if(FFS_DBG, "f_read() failed: %d\n", res);
mkistler 0:812e8b0b2832 54 return -1;
mkistler 0:812e8b0b2832 55 }
mkistler 0:812e8b0b2832 56 return n;
mkistler 0:812e8b0b2832 57 }
mkistler 0:812e8b0b2832 58
mkistler 0:812e8b0b2832 59 int FATFileHandle::isatty() {
mkistler 0:812e8b0b2832 60 return 0;
mkistler 0:812e8b0b2832 61 }
mkistler 0:812e8b0b2832 62
mkistler 0:812e8b0b2832 63 off_t FATFileHandle::lseek(off_t position, int whence) {
mkistler 0:812e8b0b2832 64 if (whence == SEEK_END) {
mkistler 0:812e8b0b2832 65 position += _fh.fsize;
mkistler 0:812e8b0b2832 66 } else if(whence==SEEK_CUR) {
mkistler 0:812e8b0b2832 67 position += _fh.fptr;
mkistler 0:812e8b0b2832 68 }
mkistler 0:812e8b0b2832 69 FRESULT res = f_lseek(&_fh, position);
mkistler 0:812e8b0b2832 70 if (res) {
mkistler 0:812e8b0b2832 71 debug_if(FFS_DBG, "lseek failed: %d\n", res);
mkistler 0:812e8b0b2832 72 return -1;
mkistler 0:812e8b0b2832 73 } else {
mkistler 0:812e8b0b2832 74 debug_if(FFS_DBG, "lseek OK, returning %i\n", _fh.fptr);
mkistler 0:812e8b0b2832 75 return _fh.fptr;
mkistler 0:812e8b0b2832 76 }
mkistler 0:812e8b0b2832 77 }
mkistler 0:812e8b0b2832 78
mkistler 0:812e8b0b2832 79 int FATFileHandle::fsync() {
mkistler 0:812e8b0b2832 80 FRESULT res = f_sync(&_fh);
mkistler 0:812e8b0b2832 81 if (res) {
mkistler 0:812e8b0b2832 82 debug_if(FFS_DBG, "f_sync() failed: %d\n", res);
mkistler 0:812e8b0b2832 83 return -1;
mkistler 0:812e8b0b2832 84 }
mkistler 0:812e8b0b2832 85 return 0;
mkistler 0:812e8b0b2832 86 }
mkistler 0:812e8b0b2832 87
mkistler 0:812e8b0b2832 88 off_t FATFileHandle::flen() {
mkistler 0:812e8b0b2832 89 return _fh.fsize;
mkistler 0:812e8b0b2832 90 }