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mbed library sources. Supersedes mbed-src.

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platform/DirHandle.h@180:d79f997829d6, 2017-12-18 (annotated)

Committer:
Anythingconnected
Date:
Mon Dec 18 10:14:27 2017 +0000
Revision:
180:d79f997829d6
Parent:
178:79309dc6340a 
Getting byte by byte read to work

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AnnaBridge 167:e84263d55307 1 /* mbed Microcontroller Library
AnnaBridge 167:e84263d55307 2 * Copyright (c) 2006-2013 ARM Limited
AnnaBridge 167:e84263d55307 3 *
AnnaBridge 167:e84263d55307 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 167:e84263d55307 5 * you may not use this file except in compliance with the License.
AnnaBridge 167:e84263d55307 6 * You may obtain a copy of the License at
AnnaBridge 167:e84263d55307 7 *
AnnaBridge 167:e84263d55307 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 167:e84263d55307 9 *
AnnaBridge 167:e84263d55307 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 167:e84263d55307 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 167:e84263d55307 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 167:e84263d55307 13 * See the License for the specific language governing permissions and
AnnaBridge 167:e84263d55307 14 * limitations under the License.
AnnaBridge 167:e84263d55307 15 */
AnnaBridge 167:e84263d55307 16 #ifndef MBED_DIRHANDLE_H
AnnaBridge 167:e84263d55307 17 #define MBED_DIRHANDLE_H
AnnaBridge 167:e84263d55307 18
AnnaBridge 167:e84263d55307 19 #include <stdint.h>
AnnaBridge 167:e84263d55307 20 #include "platform/platform.h"
AnnaBridge 167:e84263d55307 21 #include "platform/FileHandle.h"
AnnaBridge 168:9672193075cf 22 #include "platform/NonCopyable.h"
AnnaBridge 167:e84263d55307 23
AnnaBridge 167:e84263d55307 24 namespace mbed {
AnnaBridge 167:e84263d55307 25 /** \addtogroup platform */
AnnaBridge 178:79309dc6340a 26 /** @{*/
AnnaBridge 178:79309dc6340a 27 /**
AnnaBridge 178:79309dc6340a 28 * \defgroup platform_DirHandle DirHandle functions
AnnaBridge 178:79309dc6340a 29 * @{
AnnaBridge 178:79309dc6340a 30 */
AnnaBridge 167:e84263d55307 31
AnnaBridge 167:e84263d55307 32
AnnaBridge 167:e84263d55307 33 /** Represents a directory stream. Objects of this type are returned
AnnaBridge 167:e84263d55307 34 * by an opendir function. The core functions are read and seek,
AnnaBridge 167:e84263d55307 35 * but only a subset needs to be provided.
AnnaBridge 167:e84263d55307 36 *
AnnaBridge 167:e84263d55307 37 * If a FileSystemLike class defines the opendir method, then the
AnnaBridge 167:e84263d55307 38 * directories of an object of that type can be accessed by
AnnaBridge 167:e84263d55307 39 * DIR *d = opendir("/example/directory") (or opendir("/example")
AnnaBridge 167:e84263d55307 40 * to open the root of the filesystem), and then using readdir(d) etc.
AnnaBridge 167:e84263d55307 41 *
AnnaBridge 167:e84263d55307 42 * The root directory is considered to contain all FileHandle and
AnnaBridge 167:e84263d55307 43 * FileSystem objects, so the DIR* returned by opendir("/") will
AnnaBridge 167:e84263d55307 44 * reflect this.
AnnaBridge 167:e84263d55307 45 *
AnnaBridge 167:e84263d55307 46 * @note to create a directory, @see Dir
AnnaBridge 167:e84263d55307 47 * @note Synchronization level: Set by subclass
AnnaBridge 167:e84263d55307 48 */
AnnaBridge 168:9672193075cf 49 class DirHandle : private NonCopyable<DirHandle> {
AnnaBridge 167:e84263d55307 50 public:
AnnaBridge 167:e84263d55307 51 virtual ~DirHandle() {}
AnnaBridge 167:e84263d55307 52
AnnaBridge 167:e84263d55307 53 /** Read the next directory entry
AnnaBridge 167:e84263d55307 54 *
AnnaBridge 167:e84263d55307 55 * @param ent The directory entry to fill out
AnnaBridge 167:e84263d55307 56 * @return 1 on reading a filename, 0 at end of directory, negative error on failure
AnnaBridge 167:e84263d55307 57 */
AnnaBridge 167:e84263d55307 58 virtual ssize_t read(struct dirent *ent) = 0;
AnnaBridge 167:e84263d55307 59
AnnaBridge 167:e84263d55307 60 /** Close a directory
AnnaBridge 167:e84263d55307 61 *
AnnaBridge 167:e84263d55307 62 * @return 0 on success, negative error code on failure
AnnaBridge 167:e84263d55307 63 */
AnnaBridge 167:e84263d55307 64 virtual int close() = 0;
AnnaBridge 167:e84263d55307 65
AnnaBridge 167:e84263d55307 66 /** Set the current position of the directory
AnnaBridge 167:e84263d55307 67 *
AnnaBridge 167:e84263d55307 68 * @param offset Offset of the location to seek to,
AnnaBridge 167:e84263d55307 69 * must be a value returned from tell
AnnaBridge 167:e84263d55307 70 */
AnnaBridge 167:e84263d55307 71 virtual void seek(off_t offset) = 0;
AnnaBridge 167:e84263d55307 72
AnnaBridge 167:e84263d55307 73 /** Get the current position of the directory
AnnaBridge 167:e84263d55307 74 *
AnnaBridge 167:e84263d55307 75 * @return Position of the directory that can be passed to rewind
AnnaBridge 167:e84263d55307 76 */
AnnaBridge 167:e84263d55307 77 virtual off_t tell() = 0;
AnnaBridge 167:e84263d55307 78
AnnaBridge 167:e84263d55307 79 /** Rewind the current position to the beginning of the directory
AnnaBridge 167:e84263d55307 80 */
AnnaBridge 167:e84263d55307 81 virtual void rewind() = 0;
AnnaBridge 167:e84263d55307 82
AnnaBridge 167:e84263d55307 83 /** Get the sizeof the directory
AnnaBridge 167:e84263d55307 84 *
AnnaBridge 167:e84263d55307 85 * @return Number of files in the directory
AnnaBridge 167:e84263d55307 86 */
AnnaBridge 167:e84263d55307 87 virtual size_t size()
AnnaBridge 167:e84263d55307 88 {
AnnaBridge 167:e84263d55307 89 off_t off = tell();
AnnaBridge 167:e84263d55307 90 size_t size = 0;
AnnaBridge 167:e84263d55307 91 struct dirent *ent = new struct dirent;
AnnaBridge 167:e84263d55307 92
AnnaBridge 167:e84263d55307 93 rewind();
AnnaBridge 167:e84263d55307 94 while (read(ent) > 0) {
AnnaBridge 167:e84263d55307 95 size += 1;
AnnaBridge 167:e84263d55307 96 }
AnnaBridge 167:e84263d55307 97 seek(off);
AnnaBridge 167:e84263d55307 98
AnnaBridge 167:e84263d55307 99 delete ent;
AnnaBridge 167:e84263d55307 100 return size;
AnnaBridge 167:e84263d55307 101 }
AnnaBridge 167:e84263d55307 102
AnnaBridge 167:e84263d55307 103 /** Closes the directory.
AnnaBridge 167:e84263d55307 104 *
AnnaBridge 167:e84263d55307 105 * @returns
AnnaBridge 167:e84263d55307 106 * 0 on success,
AnnaBridge 167:e84263d55307 107 * -1 on error.
AnnaBridge 167:e84263d55307 108 */
AnnaBridge 167:e84263d55307 109 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::close")
AnnaBridge 167:e84263d55307 110 virtual int closedir() { return close(); };
AnnaBridge 167:e84263d55307 111
AnnaBridge 167:e84263d55307 112 /** Return the directory entry at the current position, and
AnnaBridge 167:e84263d55307 113 * advances the position to the next entry.
AnnaBridge 167:e84263d55307 114 *
AnnaBridge 167:e84263d55307 115 * @returns
AnnaBridge 167:e84263d55307 116 * A pointer to a dirent structure representing the
AnnaBridge 167:e84263d55307 117 * directory entry at the current position, or NULL on reaching
AnnaBridge 167:e84263d55307 118 * end of directory or error.
AnnaBridge 167:e84263d55307 119 */
AnnaBridge 167:e84263d55307 120 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::read")
AnnaBridge 167:e84263d55307 121 virtual struct dirent *readdir()
AnnaBridge 167:e84263d55307 122 {
AnnaBridge 167:e84263d55307 123 static struct dirent ent;
AnnaBridge 167:e84263d55307 124 return (read(&ent) > 0) ? &ent : NULL;
AnnaBridge 167:e84263d55307 125 }
AnnaBridge 167:e84263d55307 126
AnnaBridge 167:e84263d55307 127 /** Resets the position to the beginning of the directory.
AnnaBridge 167:e84263d55307 128 */
AnnaBridge 167:e84263d55307 129 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::rewind")
AnnaBridge 167:e84263d55307 130 virtual void rewinddir() { rewind(); }
AnnaBridge 167:e84263d55307 131
AnnaBridge 167:e84263d55307 132 /** Returns the current position of the DirHandle.
AnnaBridge 167:e84263d55307 133 *
AnnaBridge 167:e84263d55307 134 * @returns
AnnaBridge 167:e84263d55307 135 * the current position,
AnnaBridge 167:e84263d55307 136 * -1 on error.
AnnaBridge 167:e84263d55307 137 */
AnnaBridge 167:e84263d55307 138 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::tell")
AnnaBridge 167:e84263d55307 139 virtual off_t telldir() { return tell(); }
AnnaBridge 167:e84263d55307 140
AnnaBridge 167:e84263d55307 141 /** Sets the position of the DirHandle.
AnnaBridge 167:e84263d55307 142 *
AnnaBridge 167:e84263d55307 143 * @param location The location to seek to. Must be a value returned by telldir.
AnnaBridge 167:e84263d55307 144 */
AnnaBridge 167:e84263d55307 145 MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::seek")
AnnaBridge 167:e84263d55307 146 virtual void seekdir(off_t location) { seek(location); }
AnnaBridge 167:e84263d55307 147 };
AnnaBridge 167:e84263d55307 148
AnnaBridge 178:79309dc6340a 149 /**@}*/
AnnaBridge 167:e84263d55307 150
AnnaBridge 178:79309dc6340a 151 /**@}*/
AnnaBridge 167:e84263d55307 152 } // namespace mbed
AnnaBridge 167:e84263d55307 153
AnnaBridge 167:e84263d55307 154 #endif /* MBED_DIRHANDLE_H */