PHung Tung / WAV2

SPKT

Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

mbed_src_STM32F7/common/FileSystemLike.cpp@0:aa3fc5ad02f7, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 09:08:29 2019 +0000
Revision:
0:aa3fc5ad02f7
SPKT

Who changed what in which revision?

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phungductung 0:aa3fc5ad02f7 1 /* mbed Microcontroller Library
phungductung 0:aa3fc5ad02f7 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:aa3fc5ad02f7 3 *
phungductung 0:aa3fc5ad02f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:aa3fc5ad02f7 5 * you may not use this file except in compliance with the License.
phungductung 0:aa3fc5ad02f7 6 * You may obtain a copy of the License at
phungductung 0:aa3fc5ad02f7 7 *
phungductung 0:aa3fc5ad02f7 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:aa3fc5ad02f7 9 *
phungductung 0:aa3fc5ad02f7 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:aa3fc5ad02f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:aa3fc5ad02f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:aa3fc5ad02f7 13 * See the License for the specific language governing permissions and
phungductung 0:aa3fc5ad02f7 14 * limitations under the License.
phungductung 0:aa3fc5ad02f7 15 */
phungductung 0:aa3fc5ad02f7 16 #include "FileSystemLike.h"
phungductung 0:aa3fc5ad02f7 17
phungductung 0:aa3fc5ad02f7 18 namespace mbed {
phungductung 0:aa3fc5ad02f7 19
phungductung 0:aa3fc5ad02f7 20 class BaseDirHandle : public DirHandle {
phungductung 0:aa3fc5ad02f7 21 public:
phungductung 0:aa3fc5ad02f7 22 /*
phungductung 0:aa3fc5ad02f7 23 We keep track of our current location as the n'th object in the
phungductung 0:aa3fc5ad02f7 24 FileSystemLike list. Using a Base* instead would cause problems if that
phungductung 0:aa3fc5ad02f7 25 object were to be destroyed between readdirs.
phungductung 0:aa3fc5ad02f7 26 Using this method does mean though that destroying/creating objects can
phungductung 0:aa3fc5ad02f7 27 give unusual results from readdir.
phungductung 0:aa3fc5ad02f7 28 */
phungductung 0:aa3fc5ad02f7 29 off_t n;
phungductung 0:aa3fc5ad02f7 30 struct dirent cur_entry;
phungductung 0:aa3fc5ad02f7 31
phungductung 0:aa3fc5ad02f7 32 BaseDirHandle() : n(0), cur_entry() {
phungductung 0:aa3fc5ad02f7 33 }
phungductung 0:aa3fc5ad02f7 34
phungductung 0:aa3fc5ad02f7 35 virtual int closedir() {
phungductung 0:aa3fc5ad02f7 36 delete this;
phungductung 0:aa3fc5ad02f7 37 return 0;
phungductung 0:aa3fc5ad02f7 38 }
phungductung 0:aa3fc5ad02f7 39
phungductung 0:aa3fc5ad02f7 40 virtual struct dirent *readdir() {
phungductung 0:aa3fc5ad02f7 41 FileBase *ptr = FileBase::get(n);
phungductung 0:aa3fc5ad02f7 42 if (ptr == NULL) return NULL;
phungductung 0:aa3fc5ad02f7 43
phungductung 0:aa3fc5ad02f7 44 /* Increment n, so next readdir gets the next item */
phungductung 0:aa3fc5ad02f7 45 n++;
phungductung 0:aa3fc5ad02f7 46
phungductung 0:aa3fc5ad02f7 47 /* Setup cur entry and return a pointer to it */
phungductung 0:aa3fc5ad02f7 48 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
phungductung 0:aa3fc5ad02f7 49 return &cur_entry;
phungductung 0:aa3fc5ad02f7 50 }
phungductung 0:aa3fc5ad02f7 51
phungductung 0:aa3fc5ad02f7 52 virtual off_t telldir() {
phungductung 0:aa3fc5ad02f7 53 return n;
phungductung 0:aa3fc5ad02f7 54 }
phungductung 0:aa3fc5ad02f7 55
phungductung 0:aa3fc5ad02f7 56 virtual void seekdir(off_t offset) {
phungductung 0:aa3fc5ad02f7 57 n = offset;
phungductung 0:aa3fc5ad02f7 58 }
phungductung 0:aa3fc5ad02f7 59
phungductung 0:aa3fc5ad02f7 60 virtual void rewinddir() {
phungductung 0:aa3fc5ad02f7 61 n = 0;
phungductung 0:aa3fc5ad02f7 62 }
phungductung 0:aa3fc5ad02f7 63 };
phungductung 0:aa3fc5ad02f7 64
phungductung 0:aa3fc5ad02f7 65 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
phungductung 0:aa3fc5ad02f7 66
phungductung 0:aa3fc5ad02f7 67 }
phungductung 0:aa3fc5ad02f7 68
phungductung 0:aa3fc5ad02f7 69 FileSystemLike::~FileSystemLike() {
phungductung 0:aa3fc5ad02f7 70
phungductung 0:aa3fc5ad02f7 71 }
phungductung 0:aa3fc5ad02f7 72
phungductung 0:aa3fc5ad02f7 73 DirHandle *FileSystemLike::opendir() {
phungductung 0:aa3fc5ad02f7 74 return new BaseDirHandle();
phungductung 0:aa3fc5ad02f7 75 }
phungductung 0:aa3fc5ad02f7 76
phungductung 0:aa3fc5ad02f7 77 } // namespace mbed