[PATCH v2 5/9] ipa: rkisp1: params: Check for empty parameters

[Stefan Klug]

Add functions to check for empty parameter blocks. Modify the constructor
so that a parameter block constructed from an empty span stays empty.

Signed-off-by: Stefan Klug <stefan.klug at ideasonboard.com>

---

Changes in v2:
- Removed unrelated get() functions
---
 src/ipa/rkisp1/params.cpp | 3 +++
 src/ipa/rkisp1/params.h   | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/src/ipa/rkisp1/params.cpp b/src/ipa/rkisp1/params.cpp
index 4c0b051ce65d..b4a889e415fc 100644
--- a/src/ipa/rkisp1/params.cpp
+++ b/src/ipa/rkisp1/params.cpp
@@ -82,6 +82,9 @@ RkISP1ParamsBlockBase::RkISP1ParamsBlockBase(RkISP1Params *params, BlockType typ
 					     const Span<uint8_t> &data)
 	: params_(params), type_(type)
 {
+	if (data.empty())
+		return;
+
 	if (params_->format() == V4L2_META_FMT_RK_ISP1_EXT_PARAMS) {
 		header_ = data.subspan(0, sizeof(rkisp1_ext_params_block_header));
 		data_ = data.subspan(sizeof(rkisp1_ext_params_block_header));
diff --git a/src/ipa/rkisp1/params.h b/src/ipa/rkisp1/params.h
index 40450e34497a..04b06c2a6266 100644
--- a/src/ipa/rkisp1/params.h
+++ b/src/ipa/rkisp1/params.h
@@ -89,6 +89,9 @@ public:
 
 	void setEnabled(bool enabled);
 
+	bool isValid() const { return !data_.empty(); }
+	explicit operator bool() const { return !data_.empty(); }
+
 private:
 	LIBCAMERA_DISABLE_COPY(RkISP1ParamsBlockBase)
 
-- 
2.43.0