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mbed/drivers/FileLike.h

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+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_FILELIKE_H
+#define MBED_FILELIKE_H
+
+#include "platform/mbed_toolchain.h"
+#include "drivers/FileBase.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+
+
+/* Class FileLike
+ *  A file-like object is one that can be opened with fopen by
+ *  fopen("/name", mode).
+ *
+ *  @Note Synchronization level: Set by subclass
+ */
+class FileLike : public FileBase {
+public:
+    /** Constructor FileLike
+     *
+     *  @param name     The name to use to open the file.
+     */
+    FileLike(const char *name = NULL) : FileBase(name, FilePathType) {}
+    virtual ~FileLike() {}
+
+    /** Read the contents of a file into a buffer
+     *
+     *  @param buffer   The buffer to read in to
+     *  @param size     The number of bytes to read
+     *  @return         The number of bytes read, 0 at end of file, negative error on failure
+     */
+    virtual ssize_t read(void *buffer, size_t len) = 0;
+
+    /** Write the contents of a buffer to a file
+     *
+     *  @param buffer   The buffer to write from
+     *  @param size     The number of bytes to write 
+     *  @return         The number of bytes written, negative error on failure
+     */
+    virtual ssize_t write(const void *buffer, size_t len) = 0;
+
+    /** Close a file
+     *
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual int close() = 0;
+
+    /** Flush any buffers associated with the file
+     *
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual int sync() = 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;
+
+    /** Get the file position of the file
+     *
+     *  @return         The current offset in the file
+     */
+    virtual off_t tell() = 0;
+
+    /** Rewind the file position to the beginning of the file
+     *
+     *  @note This is equivalent to file_seek(file, 0, FS_SEEK_SET)
+     */
+    virtual void rewind() = 0;
+
+    /** Get the size of the file
+     *
+     *  @return         Size of the file in bytes
+     */
+    virtual size_t size() = 0;
+
+    /** Move the file position to a given offset from a given location.
+     *
+     *  @param offset The offset from whence to move to
+     *  @param whence SEEK_SET for the start of the file, SEEK_CUR for the
+     *   current file position, or SEEK_END for the end of the file.
+     *
+     *  @returns
+     *    new file position on success,
+     *    -1 on failure or unsupported
+     */
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by FileLike::seek")
+    virtual off_t lseek(off_t offset, int whence) { return seek(offset, whence); }
+
+    /** Flush any buffers associated with the FileHandle, ensuring it
+     *  is up to date on disk
+     *
+     *  @returns
+     *    0 on success or un-needed,
+     *   -1 on error
+     */
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by FileLike::sync")
+    virtual int fsync() { return sync(); }
+
+    /** Find the length of the file
+     *
+     *  @returns
+     *   Length of the file
+     */
+    MBED_DEPRECATED_SINCE("mbed-os-5.4", "Replaced by FileLike::size")
+    virtual off_t flen() { return size(); }
+
+protected:
+    /** Acquire exclusive access to this object.
+     */
+    virtual void lock() {
+        // Stub
+    }
+
+    /** Release exclusive access to this object.
+     */
+    virtual void unlock() {
+        // Stub
+    }
+};
+
+
+/** @}*/
+} // namespace mbed
+
+#endif