FileSystem: Reverted deprecation of DirHandle

Should follow same path as FileHandle, although this is less used
and there is currently no route to introduce a hook for a customized
DirHandle in retarget.

features/filesystem/Dir.h

@@ -18,6 +18,7 @@
 #define DIR_H
 
 #include "filesystem/FileSystem.h"
+#include "platform/DirHandle.h"
 
 namespace mbed {
 /** \addtogroup filesystem */
@@ -26,7 +27,7 @@ namespace mbed {
 
 /** Dir class
  */
-class Dir {
+class Dir : public DirHandle {
 public:
     /** Create an uninitialized directory
      *

platform/DirHandle.h

@@ -18,42 +18,92 @@
 
 #include <stdint.h>
 #include "platform/platform.h"
-
-#include "FileHandle.h"
+#include "platform/FileHandle.h"
 
 namespace mbed {
 /** \addtogroup drivers */
 /** @{*/
 
+
 /** Represents a directory stream. Objects of this type are returned
- *  by a FileSystemLike's opendir method. Implementations must define
- *  at least closedir, readdir and rewinddir.
+ *  by an opendir function. The core functions are read and seek,
+ *  but only a subset needs to be provided.
  *
  *  If a FileSystemLike class defines the opendir method, then the
  *  directories of an object of that type can be accessed by
  *  DIR *d = opendir("/example/directory") (or opendir("/example")
  *  to open the root of the filesystem), and then using readdir(d) etc.
  *
- *  The root directory is considered to contain all FileLike and
- *  FileSystemLike objects, so the DIR* returned by opendir("/") will
+ *  The root directory is considered to contain all FileHandle and
+ *  FileSystem objects, so the DIR* returned by opendir("/") will
  *  reflect this.
  *
+ *  @note to create a directory, @see Dir
  *  @Note Synchronization level: Set by subclass
  */
 class DirHandle {
 public:
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-        "The mbed 2 filesystem classes have been superseeded by the FileSystem api, "
-        "Replaced by File")
-    DirHandle() {}
+    virtual ~DirHandle() {}
+
+    /** Read the next directory entry
+     *
+     *  @param path     The buffer to read the null terminated path name in to
+     *  @param ent      The directory entry to fill out
+     *  @return         1 on reading a filename, 0 at end of directory, negative error on failure
+     */
+    virtual ssize_t read(struct dirent *ent) = 0;
+
+    /** Close a directory
+     *
+     *  return          0 on success, negative error code on failure
+     */
+    virtual int close() = 0;
+
+    /** Set the current position of the directory
+     *
+     *  @param offset   Offset of the location to seek to,
+     *                  must be a value returned from tell
+     */
+    virtual void seek(off_t offset) = 0;
+
+    /** Get the current position of the directory
+     *
+     *  @return         Position of the directory that can be passed to rewind
+     */
+    virtual off_t tell() = 0;
+
+    /** Rewind the current position to the beginning of the directory
+     */
+    virtual void rewind() = 0;
+
+    /** Get the sizeof the directory 
+     *
+     *  @return         Number of files in the directory
+     */
+    virtual size_t size()
+    {
+        off_t off = tell();
+        size_t size = 0;
+        struct dirent *ent = new struct dirent;
+
+        rewind();
+        while (read(ent) > 0) {
+            size += 1;
+        }
+        seek(off);
+
+        delete ent;
+        return size;
+    }
 
     /** Closes the directory.
      *
      *  @returns
      *    0 on success,
      *   -1 on error.
      */
-    virtual int closedir()=0;
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::close")
+    virtual int closedir() { return close(); };
 
     /** Return the directory entry at the current position, and
      *  advances the position to the next entry.
@@ -63,51 +113,36 @@ class DirHandle {
      *  directory entry at the current position, or NULL on reaching
      *  end of directory or error.
      */
-    virtual struct dirent *readdir()=0;
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::read")
+    virtual struct dirent *readdir()
+    {
+        static struct dirent ent;
+        return (read(&ent) > 0) ? &ent : NULL;
+    }
 
     /** Resets the position to the beginning of the directory.
      */
-    virtual void rewinddir()=0;
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::rewind")
+    virtual void rewinddir() { rewind(); }
 
     /** Returns the current position of the DirHandle.
      *
      * @returns
      *   the current position,
      *  -1 on error.
      */
-    virtual off_t telldir() { return -1; }
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::tell")
+    virtual off_t telldir() { return tell(); }
 
     /** Sets the position of the DirHandle.
      *
      *  @param location The location to seek to. Must be a value returned by telldir.
      */
-    virtual void seekdir(off_t location) { (void)location;}
-
-    virtual ~DirHandle() {}
-
-protected:
-
-    /** Acquire exclusive access to this object.
-     */
-    virtual void lock() {
-        // Stub
-    }
-
-    /** Release exclusive access to this object.
-     */
-    virtual void unlock() {
-        // Stub
-    }
-
-protected:
-    /** Internal-only constructor to work around deprecated notices when not used
-     *. due to nested deprecations and difficulty of compilers finding their way around
-     *  the class hierarchy
-     */
-    friend class FileSystemLike;
-    DirHandle(int) {}
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by DirHandle::seek")
+    virtual void seekdir(off_t location) { seek(location); }
 };
 
+
 } // namespace mbed
 
 #endif /* MBED_DIRHANDLE_H */

platform/FileHandle.h

@@ -55,6 +55,17 @@ class FileHandle {
      */
     virtual ssize_t write(const void *buffer, size_t len) = 0;
 
+    /** Move the file position to a given offset from from a given location
+     *
+     *  @param offset   The offset from whence to move to
+     *  @param whence   The start of where to seek
+     *      SEEK_SET to start from beginning of file,
+     *      SEEK_CUR to start from current position in file,
+     *      SEEK_END to start from end of file
+     *  @return         The new offset of the file
+     */
+    virtual off_t seek(off_t offset, int whence = SEEK_SET) = 0;
+
     /** Close a file
      *
      *  @return         0 on success, negative error code on failure
@@ -65,24 +76,19 @@ class FileHandle {
      *
      *  @return         0 on success, negative error code on failure
      */
-    virtual int sync() = 0;
+    virtual int sync()
+    {
+        return 0;
+    }
 
     /** Check if the file in an interactive terminal device
      *
      *  @return         True if the file is a terminal
      */
-    virtual int isatty() = 0;
-
-    /** Move the file position to a given offset from from a given location
-     *
-     *  @param offset   The offset from whence to move to
-     *  @param whence   The start of where to seek
-     *      SEEK_SET to start from beginning of file,
-     *      SEEK_CUR to start from current position in file,
-     *      SEEK_END to start from end of file
-     *  @return         The new offset of the file
-     */
-    virtual off_t seek(off_t offset, int whence = SEEK_SET) = 0;
+    virtual int isatty()
+    {
+        return false;
+    }
 
     /** Get the file position of the file
      *

platform/FileSystemLike.cpp

@@ -27,48 +27,47 @@ class BaseDirHandle : public DirHandle {
       give unusual results from readdir.
     */
     off_t n;
-    struct dirent cur_entry;
 
-    BaseDirHandle() : DirHandle(0), n(0), cur_entry() {
+    BaseDirHandle() : DirHandle(), n(0) {
     }
 
-    virtual int closedir() {
+    virtual int close() {
         // No lock can be used in destructor
         delete this;
         return 0;
     }
 
-    virtual struct dirent *readdir() {
+    virtual int read(struct dirent *ent) {
         lock();
         FileBase *ptr = FileBase::get(n);
         if (ptr == NULL) {
             unlock();
-            return NULL;
+            return -1;
         }
 
         /* Increment n, so next readdir gets the next item */
         n++;
 
         /* Setup cur entry and return a pointer to it */
-        std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
+        std::strncpy(ent->d_name, ptr->getName(), NAME_MAX);
         unlock();
-        return &cur_entry;
+        return 0;
     }
 
-    virtual off_t telldir() {
+    virtual off_t tell() {
         lock();
         off_t offset = n;
         unlock();
         return offset;
     }
 
-    virtual void seekdir(off_t offset) {
+    virtual void seek(off_t offset) {
         lock();
         n = offset;
         unlock();
     }
 
-    virtual void rewinddir() {
+    virtual void rewind() {
         lock();
         n = 0;
         unlock();

platform/LocalFileSystem.cpp

@@ -182,43 +182,42 @@ void LocalFileHandle::unlock() {
 class LocalDirHandle : public DirHandle {
 
 public:
-    struct dirent cur_entry;
     XFINFO info;
 
-    LocalDirHandle() : cur_entry(), info() {
+    LocalDirHandle() : info() {
     }
 
-    virtual int closedir() {
+    virtual int close() {
         // No lock can be used in destructor
         delete this;
         return 0;
     }
 
-    virtual struct dirent *readdir() {
+    virtual int read(struct dirent *ent) {
         lock();
         if (xffind("*", &info)!=0) {
             unlock();
-            return NULL;
+            return 0;
         }
-        memcpy(cur_entry.d_name, info.name, sizeof(info.name));
+        memcpy(ent->d_name, info.name, sizeof(info.name));
         unlock();
-        return &cur_entry;
+        return 1;
     }
 
-    virtual void rewinddir() {
+    virtual void rewind() {
         lock();
         info.fileID = 0;
         unlock();
     }
 
-    virtual off_t telldir() {
+    virtual off_t tell() {
         lock();
         int fileId = info.fileID;
         unlock();
         return fileId;
     }
 
-    virtual void seekdir(off_t offset) {
+    virtual void seek(off_t offset) {
         lock();
         info.fileID = offset;
         unlock();