Implement IComponent::setState()

src/common/serialization/vst3/base.cpp

@@ -175,6 +175,10 @@ tresult PLUGIN_API VectorStream::queryInterface(Steinberg::FIDString _iid,
     return Steinberg::kNoInterface;
 }
 
+size_t VectorStream::size() const {
+    return buffer.size();
+}
+
 tresult PLUGIN_API VectorStream::read(void* buffer,
                                       int32 numBytes,
                                       int32* numBytesRead) {

src/common/serialization/vst3/base.h

@@ -134,6 +134,11 @@ class VectorStream : public Steinberg::IBStream,
 
     DECLARE_FUNKNOWN_METHODS
 
+    /**
+     * Return the buffer's, used in the logging messages.
+     */
+    size_t size() const;
+
     // From `IBstream`
     tresult PLUGIN_API read(void* buffer,
                             int32 numBytes,

src/common/serialization/vst3/component.h

@@ -350,6 +350,25 @@ class YaComponent : public Steinberg::Vst::IComponent {
     };
 
     virtual tresult PLUGIN_API setActive(TBool state) override = 0;
+
+    /**
+     * Message to pass through a call to `IComponent::setState(state)` to the
+     * Wine plugin host.
+     */
+    struct SetState {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+
+        VectorStream state;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.object(state);
+        }
+    };
+
     virtual tresult PLUGIN_API
     setState(Steinberg::IBStream* state) override = 0;
     virtual tresult PLUGIN_API