[C API] Add ov_core_add_extension C API

src/bindings/c/include/openvino/c/ov_core.h

@@ -215,6 +215,16 @@ ov_core_compile_model(const ov_core_t* core,
                       ov_compiled_model_t** compiled_model,
                       ...);
 
+/**
+ * @brief Adds an extension to the core.
+ * @ingroup ov_core_c_api
+ * @param core A pointer to the ov_core_t instance.
+ * @param library_path Path to an extension.
+ * @return Status code of the operation: OK(0) for success.
+ */
+OPENVINO_C_API(ov_status_e)
+ov_core_add_extension(const ov_core_t* core, const char* library_path);
+
 /**
  * @brief Reads a model and creates a compiled model from the IR/ONNX/PDPD file.
  * This can be more efficient than using the ov_core_read_model_from_XXX + ov_core_compile_model flow,

src/bindings/c/src/ov_core.cpp

@@ -132,6 +132,18 @@ ov_status_e ov_core_read_model_from_memory_buffer(const ov_core_t* core,
     return ov_status_e::OK;
 }
 
+ov_status_e ov_core_add_extension(const ov_core_t* core, const char* extension_path) {
+    if (!core || !extension_path) {
+        return ov_status_e::INVALID_C_PARAM;
+    }
+
+    try {
+        core->object->add_extension(extension_path);
+    }
+    CATCH_OV_EXCEPTIONS
+    return ov_status_e::OK;
+}
+
 ov_status_e ov_core_compile_model(const ov_core_t* core,
                                   const ov_model_t* model,
                                   const char* device_name,

src/bindings/c/tests/ov_core_test.cpp

@@ -126,6 +126,15 @@ TEST_P(ov_core_test, ov_core_compile_model) {
     ov_core_free(core);
 }
 
+TEST_P(ov_core_test, ov_core_add_extension) {
+    ov_core_t* core = nullptr;
+    OV_EXPECT_OK(ov_core_create(&core));
+    EXPECT_NE(nullptr, core);
+
+    OV_EXPECT_OK(ov_core_add_extension(core, extension_file_path.c_str()));
+    ov_core_free(core);
+}
+
 TEST_P(ov_core_test, ov_core_compile_model_with_property) {
     auto device_name = GetParam();
     ov_core_t* core = nullptr;

src/bindings/c/tests/ov_test.hpp

@@ -9,6 +9,7 @@
 #include <fstream>
 #include <openvino/util/file_util.hpp>
 
+#include "common_test_utils/file_utils.hpp"
 #include "openvino/c/openvino.h"
 #include "openvino/openvino.hpp"
 #include "test_model_repo.hpp"
@@ -25,22 +26,30 @@
 extern std::map<ov_element_type_e, size_t> element_type_size_map;
 #define GET_ELEMENT_TYPE_SIZE(a) element_type_size_map[a]
 
+inline std::string get_extension_file_path();
+
 class ov_capi_test_base : public ::testing::TestWithParam<std::string> {
 public:
     void SetUp() override {
         TestDataHelpers::generate_test_model();
         xml_file_name = TestDataHelpers::get_model_xml_file_name();
         bin_file_name = TestDataHelpers::get_model_bin_file_name();
+        extension_file_path = get_extension_file_path();
     }
 
     void TearDown() override {
         TestDataHelpers::release_test_model();
     }
 
 public:
-    std::string xml_file_name, bin_file_name;
+    std::string xml_file_name, bin_file_name, extension_file_path;
 };
 
+inline std::string get_extension_file_path() {
+    return ov::util::make_plugin_library_name<char>(ov::test::utils::getExecutableDirectory(),
+                                                    std::string("openvino_template_extension") + OV_BUILD_POSTFIX);
+}
+
 inline size_t find_device(ov_available_devices_t avai_devices, const char* device_name) {
     for (size_t i = 0; i < avai_devices.size; ++i) {
         if (strstr(avai_devices.devices[i], device_name))