PHung Tung / DISCO-F746_WAV_PLAYER

SPKT

Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

SRC_STM32F7/common/FileSystemLike.cpp@0:8ede47d38d10, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:37:21 2019 +0000
Revision:
0:8ede47d38d10
SPKT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:8ede47d38d10 1 /* mbed Microcontroller Library
phungductung 0:8ede47d38d10 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:8ede47d38d10 3 *
phungductung 0:8ede47d38d10 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:8ede47d38d10 5 * you may not use this file except in compliance with the License.
phungductung 0:8ede47d38d10 6 * You may obtain a copy of the License at
phungductung 0:8ede47d38d10 7 *
phungductung 0:8ede47d38d10 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:8ede47d38d10 9 *
phungductung 0:8ede47d38d10 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:8ede47d38d10 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:8ede47d38d10 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:8ede47d38d10 13 * See the License for the specific language governing permissions and
phungductung 0:8ede47d38d10 14 * limitations under the License.
phungductung 0:8ede47d38d10 15 */
phungductung 0:8ede47d38d10 16 #include "FileSystemLike.h"
phungductung 0:8ede47d38d10 17
phungductung 0:8ede47d38d10 18 namespace mbed {
phungductung 0:8ede47d38d10 19
phungductung 0:8ede47d38d10 20 class BaseDirHandle : public DirHandle {
phungductung 0:8ede47d38d10 21 public:
phungductung 0:8ede47d38d10 22 /*
phungductung 0:8ede47d38d10 23 We keep track of our current location as the n'th object in the
phungductung 0:8ede47d38d10 24 FileSystemLike list. Using a Base* instead would cause problems if that
phungductung 0:8ede47d38d10 25 object were to be destroyed between readdirs.
phungductung 0:8ede47d38d10 26 Using this method does mean though that destroying/creating objects can
phungductung 0:8ede47d38d10 27 give unusual results from readdir.
phungductung 0:8ede47d38d10 28 */
phungductung 0:8ede47d38d10 29 off_t n;
phungductung 0:8ede47d38d10 30 struct dirent cur_entry;
phungductung 0:8ede47d38d10 31
phungductung 0:8ede47d38d10 32 BaseDirHandle() : n(0), cur_entry() {
phungductung 0:8ede47d38d10 33 }
phungductung 0:8ede47d38d10 34
phungductung 0:8ede47d38d10 35 virtual int closedir() {
phungductung 0:8ede47d38d10 36 delete this;
phungductung 0:8ede47d38d10 37 return 0;
phungductung 0:8ede47d38d10 38 }
phungductung 0:8ede47d38d10 39
phungductung 0:8ede47d38d10 40 virtual struct dirent *readdir() {
phungductung 0:8ede47d38d10 41 FileBase *ptr = FileBase::get(n);
phungductung 0:8ede47d38d10 42 if (ptr == NULL) return NULL;
phungductung 0:8ede47d38d10 43
phungductung 0:8ede47d38d10 44 /* Increment n, so next readdir gets the next item */
phungductung 0:8ede47d38d10 45 n++;
phungductung 0:8ede47d38d10 46
phungductung 0:8ede47d38d10 47 /* Setup cur entry and return a pointer to it */
phungductung 0:8ede47d38d10 48 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
phungductung 0:8ede47d38d10 49 return &cur_entry;
phungductung 0:8ede47d38d10 50 }
phungductung 0:8ede47d38d10 51
phungductung 0:8ede47d38d10 52 virtual off_t telldir() {
phungductung 0:8ede47d38d10 53 return n;
phungductung 0:8ede47d38d10 54 }
phungductung 0:8ede47d38d10 55
phungductung 0:8ede47d38d10 56 virtual void seekdir(off_t offset) {
phungductung 0:8ede47d38d10 57 n = offset;
phungductung 0:8ede47d38d10 58 }
phungductung 0:8ede47d38d10 59
phungductung 0:8ede47d38d10 60 virtual void rewinddir() {
phungductung 0:8ede47d38d10 61 n = 0;
phungductung 0:8ede47d38d10 62 }
phungductung 0:8ede47d38d10 63 };
phungductung 0:8ede47d38d10 64
phungductung 0:8ede47d38d10 65 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
phungductung 0:8ede47d38d10 66
phungductung 0:8ede47d38d10 67 }
phungductung 0:8ede47d38d10 68
phungductung 0:8ede47d38d10 69 FileSystemLike::~FileSystemLike() {
phungductung 0:8ede47d38d10 70
phungductung 0:8ede47d38d10 71 }
phungductung 0:8ede47d38d10 72
phungductung 0:8ede47d38d10 73 DirHandle *FileSystemLike::opendir() {
phungductung 0:8ede47d38d10 74 return new BaseDirHandle();
phungductung 0:8ede47d38d10 75 }
phungductung 0:8ede47d38d10 76
phungductung 0:8ede47d38d10 77 } // namespace mbed