Amit Gandhi / mbed-dev

test

Fork of mbed-dev by mbed official

platform/DirHandle.h@168:e84263d55307, 2017-06-21 (annotated)

Committer:
AnnaBridge
Date:
Wed Jun 21 17:46:44 2017 +0100
Revision:
168:e84263d55307
Child:
169:9672193075cf
This updates the lib to the mbed lib v 145

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 168:e84263d55307 1 /* mbed Microcontroller Library
AnnaBridge 168:e84263d55307 2 * Copyright (c) 2006-2013 ARM Limited
AnnaBridge 168:e84263d55307 3 *
AnnaBridge 168:e84263d55307 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 168:e84263d55307 5 * you may not use this file except in compliance with the License.
AnnaBridge 168:e84263d55307 6 * You may obtain a copy of the License at
AnnaBridge 168:e84263d55307 7 *
AnnaBridge 168:e84263d55307 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 168:e84263d55307 9 *
AnnaBridge 168:e84263d55307 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 168:e84263d55307 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 168:e84263d55307 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 168:e84263d55307 13 * See the License for the specific language governing permissions and
AnnaBridge 168:e84263d55307 14 * limitations under the License.
AnnaBridge 168:e84263d55307 15 */
AnnaBridge 168:e84263d55307 16 #ifndef MBED_DIRHANDLE_H
AnnaBridge 168:e84263d55307 17 #define MBED_DIRHANDLE_H
AnnaBridge 168:e84263d55307 18
AnnaBridge 168:e84263d55307 19 #include <stdint.h>
AnnaBridge 168:e84263d55307 20 #include "platform/platform.h"
AnnaBridge 168:e84263d55307 21 #include "platform/FileHandle.h"
AnnaBridge 168:e84263d55307 22
AnnaBridge 168:e84263d55307 23 namespace mbed {
AnnaBridge 168:e84263d55307 24 /** \addtogroup platform */
AnnaBridge 168:e84263d55307 25
AnnaBridge 168:e84263d55307 26
AnnaBridge 168:e84263d55307 27 /** Represents a directory stream. Objects of this type are returned
AnnaBridge 168:e84263d55307 28 * by an opendir function. The core functions are read and seek,
AnnaBridge 168:e84263d55307 29 * but only a subset needs to be provided.
AnnaBridge 168:e84263d55307 30 *
AnnaBridge 168:e84263d55307 31 * If a FileSystemLike class defines the opendir method, then the
AnnaBridge 168:e84263d55307 32 * directories of an object of that type can be accessed by
AnnaBridge 168:e84263d55307 33 * DIR *d = opendir("/example/directory") (or opendir("/example")
AnnaBridge 168:e84263d55307 34 * to open the root of the filesystem), and then using readdir(d) etc.
AnnaBridge 168:e84263d55307 35 *
AnnaBridge 168:e84263d55307 36 * The root directory is considered to contain all FileHandle and
AnnaBridge 168:e84263d55307 37 * FileSystem objects, so the DIR* returned by opendir("/") will
AnnaBridge 168:e84263d55307 38 * reflect this.
AnnaBridge 168:e84263d55307 39 *
AnnaBridge 168:e84263d55307 40 * @note to create a directory, @see Dir
AnnaBridge 168:e84263d55307 41 * @note Synchronization level: Set by subclass
AnnaBridge 168:e84263d55307 42 * @ingroup platform
AnnaBridge 168:e84263d55307 43 */
AnnaBridge 168:e84263d55307 44 class DirHandle {
AnnaBridge 168:e84263d55307 45 public:
AnnaBridge 168:e84263d55307 46 virtual ~DirHandle() {}
AnnaBridge 168:e84263d55307 47
AnnaBridge 168:e84263d55307 48 /** Read the next directory entry
AnnaBridge 168:e84263d55307 49 *
AnnaBridge 168:e84263d55307 50 * @param ent The directory entry to fill out
AnnaBridge 168:e84263d55307 51 * @return 1 on reading a filename, 0 at end of directory, negative error on failure
AnnaBridge 168:e84263d55307 52 */
AnnaBridge 168:e84263d55307 53 virtual ssize_t read(struct dirent *ent) = 0;
AnnaBridge 168:e84263d55307 54
AnnaBridge 168:e84263d55307 55 /** Close a directory
AnnaBridge 168:e84263d55307 56 *
AnnaBridge 168:e84263d55307 57 * @return 0 on success, negative error code on failure
AnnaBridge 168:e84263d55307 58 */
AnnaBridge 168:e84263d55307 59 virtual int close() = 0;
AnnaBridge 168:e84263d55307 60
AnnaBridge 168:e84263d55307 61 /** Set the current position of the directory
AnnaBridge 168:e84263d55307 62 *
AnnaBridge 168:e84263d55307 63 * @param offset Offset of the location to seek to,
AnnaBridge 168:e84263d55307 64 * must be a value returned from tell
AnnaBridge 168:e84263d55307 65 */
AnnaBridge 168:e84263d55307 66 virtual void seek(off_t offset) = 0;
AnnaBridge 168:e84263d55307 67
AnnaBridge 168:e84263d55307 68 /** Get the current position of the directory
AnnaBridge 168:e84263d55307 69 *
AnnaBridge 168:e84263d55307 70 * @return Position of the directory that can be passed to rewind
AnnaBridge 168:e84263d55307 71 */
AnnaBridge 168:e84263d55307 72 virtual off_t tell() = 0;
AnnaBridge 168:e84263d55307 73
AnnaBridge 168:e84263d55307 74 /** Rewind the current position to the beginning of the directory
AnnaBridge 168:e84263d55307 75 */
AnnaBridge 168:e84263d55307 76 virtual void rewind() = 0;
AnnaBridge 168:e84263d55307 77
AnnaBridge 168:e84263d55307 78 /** Get the sizeof the directory
AnnaBridge 168:e84263d55307 79 *
AnnaBridge 168:e84263d55307 80 * @return Number of files in the directory
AnnaBridge 168:e84263d55307 81 */
AnnaBridge 168:e84263d55307 82 virtual size_t size()
AnnaBridge 168:e84263d55307 83 {
AnnaBridge 168:e84263d55307 84 off_t off = tell();
AnnaBridge 168:e84263d55307 85 size_t size = 0;
AnnaBridge 168:e84263d55307 86 struct dirent *ent = new struct dirent;
AnnaBridge 168:e84263d55307 87
AnnaBridge 168:e84263d55307 88 rewind();
AnnaBridge 168:e84263d55307 89 while (read(ent) > 0) {
AnnaBridge 168:e84263d55307 90 size += 1;
AnnaBridge 168:e84263d55307 91 }
AnnaBridge 168:e84263d55307 92 seek(off);
AnnaBridge 168:e84263d55307 93
AnnaBridge 168:e84263d55307 94 delete ent;
AnnaBridge 168:e84263d55307 95 return size;
AnnaBridge 168:e84263d55307 96 }
AnnaBridge 168:e84263d55307 97
AnnaBridge 168:e84263d55307 98 /** Closes the directory.
AnnaBridge 168:e84263d55307 99 *
AnnaBridge 168:e84263d55307 100 * @returns
AnnaBridge 168:e84263d55307 101 * 0 on success,
AnnaBridge 168:e84263d55307 102 * -1 on error.
AnnaBridge 168:e84263d55307 103 */
AnnaBridge 168:e84263d55307 104 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::close")
AnnaBridge 168:e84263d55307 105 virtual int closedir() { return close(); };
AnnaBridge 168:e84263d55307 106
AnnaBridge 168:e84263d55307 107 /** Return the directory entry at the current position, and
AnnaBridge 168:e84263d55307 108 * advances the position to the next entry.
AnnaBridge 168:e84263d55307 109 *
AnnaBridge 168:e84263d55307 110 * @returns
AnnaBridge 168:e84263d55307 111 * A pointer to a dirent structure representing the
AnnaBridge 168:e84263d55307 112 * directory entry at the current position, or NULL on reaching
AnnaBridge 168:e84263d55307 113 * end of directory or error.
AnnaBridge 168:e84263d55307 114 */
AnnaBridge 168:e84263d55307 115 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::read")
AnnaBridge 168:e84263d55307 116 virtual struct dirent *readdir()
AnnaBridge 168:e84263d55307 117 {
AnnaBridge 168:e84263d55307 118 static struct dirent ent;
AnnaBridge 168:e84263d55307 119 return (read(&ent) > 0) ? &ent : NULL;
AnnaBridge 168:e84263d55307 120 }
AnnaBridge 168:e84263d55307 121
AnnaBridge 168:e84263d55307 122 /** Resets the position to the beginning of the directory.
AnnaBridge 168:e84263d55307 123 */
AnnaBridge 168:e84263d55307 124 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::rewind")
AnnaBridge 168:e84263d55307 125 virtual void rewinddir() { rewind(); }
AnnaBridge 168:e84263d55307 126
AnnaBridge 168:e84263d55307 127 /** Returns the current position of the DirHandle.
AnnaBridge 168:e84263d55307 128 *
AnnaBridge 168:e84263d55307 129 * @returns
AnnaBridge 168:e84263d55307 130 * the current position,
AnnaBridge 168:e84263d55307 131 * -1 on error.
AnnaBridge 168:e84263d55307 132 */
AnnaBridge 168:e84263d55307 133 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::tell")
AnnaBridge 168:e84263d55307 134 virtual off_t telldir() { return tell(); }
AnnaBridge 168:e84263d55307 135
AnnaBridge 168:e84263d55307 136 /** Sets the position of the DirHandle.
AnnaBridge 168:e84263d55307 137 *
AnnaBridge 168:e84263d55307 138 * @param location The location to seek to. Must be a value returned by telldir.
AnnaBridge 168:e84263d55307 139 */
AnnaBridge 168:e84263d55307 140 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::seek")
AnnaBridge 168:e84263d55307 141 virtual void seekdir(off_t location) { seek(location); }
AnnaBridge 168:e84263d55307 142 };
AnnaBridge 168:e84263d55307 143
AnnaBridge 168:e84263d55307 144
AnnaBridge 168:e84263d55307 145 } // namespace mbed
AnnaBridge 168:e84263d55307 146
AnnaBridge 168:e84263d55307 147 #endif /* MBED_DIRHANDLE_H */