Add support for DRM blobs

6 files changed, 83 insertions, 0 deletions

diff --git a/libkms++/blob.cpp b/libkms++/blob.cpp
new file mode 100644
index 0000000..10a71c6
--- /dev/null
+++ b/libkms++/blob.cpp
@@ -0,0 +1,51 @@
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#include "kms++.h"
+
+using namespace std;
+
+namespace kms
+{
+
+Blob::Blob(Card& card, uint32_t blob_id)
+	: DrmObject(card, blob_id, DRM_MODE_OBJECT_BLOB), m_created(false)
+{
+	// XXX should we verify that the blob_id is a blob object?
+}
+
+Blob::Blob(Card& card, void* data, size_t len)
+	: DrmObject(card, DRM_MODE_OBJECT_BLOB), m_created(true)
+{
+	uint32_t id;
+
+	int r = drmModeCreatePropertyBlob(card.fd(), data, len, &id);
+	if (r)
+		throw invalid_argument("FAILED TO CREATE PROP\n");
+
+	set_id(id);
+}
+
+Blob::~Blob()
+{
+	if (m_created)
+		drmModeDestroyPropertyBlob(card().fd(), id());
+}
+
+vector<uint8_t> Blob::data()
+{
+	drmModePropertyBlobPtr blob = drmModeGetPropertyBlob(card().fd(), id());
+
+	if (!blob)
+		throw invalid_argument("Blob data not available");
+
+	uint8_t* data = (uint8_t*)blob->data;
+
+	auto v = vector<uint8_t>(data, data + blob->length);
+
+	drmModeFreePropertyBlob(blob);
+
+	return v;
+}
+
+}
diff --git a/libkms++/blob.h b/libkms++/blob.h
new file mode 100644
index 0000000..c6c230c
--- /dev/null
+++ b/libkms++/blob.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "drmobject.h"
+
+namespace kms
+{
+
+class Blob : public DrmObject
+{
+public:
+	Blob(Card& card, uint32_t blob_id);
+	Blob(Card& card, void* data, size_t len);
+	virtual ~Blob();
+
+	std::vector<uint8_t> data();
+
+private:
+	bool m_created;
+};
+
+}
diff --git a/libkms++/decls.h b/libkms++/decls.h
index 1bb968f..e84b29a 100644
--- a/libkms++/decls.h
+++ b/libkms++/decls.h
@@ -14,5 +14,6 @@ class DrmObject;
 class PageFlipHandlerBase;
 class Plane;
 class Property;
+class Blob;
 struct Videomode;
 }
diff --git a/libkms++/drmpropobject.cpp b/libkms++/drmpropobject.cpp
index de9dfe3..50f87a7 100644
--- a/libkms++/drmpropobject.cpp
+++ b/libkms++/drmpropobject.cpp
@@ -61,6 +61,13 @@ uint64_t DrmPropObject::get_prop_value(const string& name) const
 	throw invalid_argument("property not found: " + name);
 }
 
+unique_ptr<Blob> DrmPropObject::get_prop_value_as_blob(const string& name) const
+{
+	uint32_t blob_id = (uint32_t)get_prop_value(name);
+
+	return unique_ptr<Blob>(new Blob(card(), blob_id));
+}
+
 int DrmPropObject::set_prop_value(uint32_t id, uint64_t value)
 {
 	return drmModeObjectSetProperty(card().fd(), this->id(), this->object_type(), id, value);
diff --git a/libkms++/drmpropobject.h b/libkms++/drmpropobject.h
index 6dfd2a8..ec28d45 100644
--- a/libkms++/drmpropobject.h
+++ b/libkms++/drmpropobject.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <map>
+#include <memory>
 
 #include "drmobject.h"
 #include "decls.h"
@@ -15,6 +16,7 @@ public:
 	void refresh_props();
 	uint64_t get_prop_value(uint32_t id) const;
 	uint64_t get_prop_value(const std::string& name) const;
+	std::unique_ptr<Blob> get_prop_value_as_blob(const std::string& name) const;
 
 	const std::map<uint32_t, uint64_t>& get_prop_map() const { return m_prop_values; }
 
diff --git a/libkms++/kms++.h b/libkms++/kms++.h
index 291cf13..3365ef7 100644
--- a/libkms++/kms++.h
+++ b/libkms++/kms++.h
@@ -10,5 +10,6 @@
 #include "extframebuffer.h"
 #include "plane.h"
 #include "property.h"
+#include "blob.h"
 #include "pipeline.h"
 #include "pagefliphandler.h"