From 2c5f0ad23aa40d7410b28e01405c730e75c6cf83 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Sat, 26 Oct 2019 20:25:56 +0300
Subject: libcamera: Add controls serializer
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Add a new ControlSerializer helper to serialize and deserialize
ControlInfoMap and ControlList instances. This will be used to implement
the C IPA protocol and the communication with IPA through IPC.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
---
 src/libcamera/include/control_serializer.h | 52 ++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/libcamera/include/control_serializer.h

(limited to 'src/libcamera/include/control_serializer.h')

diff --git a/src/libcamera/include/control_serializer.h b/src/libcamera/include/control_serializer.h
new file mode 100644
index 00000000..bb3cb8e7
--- /dev/null
+++ b/src/libcamera/include/control_serializer.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * control_serializer.h - Control (de)serializer
+ */
+#ifndef __LIBCAMERA_CONTROL_SERIALIZER_H__
+#define __LIBCAMERA_CONTROL_SERIALIZER_H__
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#include <libcamera/controls.h>
+
+namespace libcamera {
+
+class ByteStreamBuffer;
+
+class ControlSerializer
+{
+public:
+	void reset();
+
+	static size_t binarySize(const ControlInfoMap &info);
+	static size_t binarySize(const ControlList &list);
+
+	int serialize(const ControlInfoMap &info, ByteStreamBuffer &buffer);
+	int serialize(const ControlList &list, ByteStreamBuffer &buffer);
+
+	template<typename T>
+	T deserialize(ByteStreamBuffer &buffer);
+
+private:
+	static size_t binarySize(const ControlValue &value);
+	static size_t binarySize(const ControlRange &range);
+
+	static void store(const ControlValue &value, ByteStreamBuffer &buffer);
+	static void store(const ControlRange &range, ByteStreamBuffer &buffer);
+
+	template<typename T>
+	T load(ControlType type, ByteStreamBuffer &b);
+
+	unsigned int serial_;
+	std::vector<std::unique_ptr<ControlId>> controlIds_;
+	std::map<unsigned int, ControlInfoMap> infoMaps_;
+	std::map<const ControlInfoMap *, unsigned int> infoMapHandles_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_CONTROL_SERIALIZER_H__ */
-- 
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