libcamera/base: Move File to base library

The File abstraction is a base helper and not part of the libcamera
API. Move it to to allow usage by users of the base library.

Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Paul Elder  <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/base/file.h

@@ -4,12 +4,13 @@
  *
  * file.h - File I/O operations
  */
-#ifndef __LIBCAMERA_INTERNAL_FILE_H__
-#define __LIBCAMERA_INTERNAL_FILE_H__
+#ifndef __LIBCAMERA_BASE_FILE_H__
+#define __LIBCAMERA_BASE_FILE_H__
+
+#include <sys/types.h>
 
 #include <map>
 #include <string>
-#include <sys/types.h>
 
 #include <libcamera/base/class.h>
 
@@ -75,4 +76,4 @@ private:
 
 } /* namespace libcamera */
 
-#endif /* __LIBCAMERA_INTERNAL_FILE_H__ */
+#endif /* __LIBCAMERA_BASE_FILE_H__ */

include/libcamera/base/meson.build

@@ -7,6 +7,7 @@ libcamera_base_headers = files([
     'class.h',
     'event_dispatcher.h',
     'event_dispatcher_poll.h',
+    'file.h',
     'log.h',
     'message.h',
     'object.h',

include/libcamera/internal/meson.build

@@ -23,7 +23,6 @@ libcamera_internal_headers = files([
     'device_enumerator_sysfs.h',
     'device_enumerator_udev.h',
     'event_notifier.h',
-    'file.h',
     'formats.h',
     'ipa_manager.h',
     'ipa_module.h',