chore: import upstream snapshot with attribution

samples/python/onnx_custom_plugin/load_plugin_lib.py

@@ -0,0 +1,58 @@
+#
+# SPDX-FileCopyrightText: Copyright (c) 1993-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import os
+import ctypes
+
+WORKING_DIR = os.environ.get("TRT_WORKING_DIR") or os.path.dirname(
+    os.path.realpath(__file__)
+)
+IS_WINDOWS = os.name == "nt"
+if IS_WINDOWS:
+    HARDMAX_PLUGIN_LIBRARY_NAME = "customHardmaxPlugin.dll"
+    HARDMAX_PLUGIN_LIBRARY = [
+        os.path.join(WORKING_DIR, "build", "Debug", HARDMAX_PLUGIN_LIBRARY_NAME),
+        os.path.join(WORKING_DIR, "build", "Release", HARDMAX_PLUGIN_LIBRARY_NAME),
+    ]
+else:
+    HARDMAX_PLUGIN_LIBRARY_NAME = "libcustomHardmaxPlugin.so"
+    HARDMAX_PLUGIN_LIBRARY = [
+        os.path.join(WORKING_DIR, "build", HARDMAX_PLUGIN_LIBRARY_NAME)
+    ]
+
+
+def load_plugin_lib():
+    for plugin_lib in HARDMAX_PLUGIN_LIBRARY:
+        if os.path.isfile(plugin_lib):
+            try:
+                # Python specifies that winmode is 0 by default, but some implementations
+                # incorrectly default to None instead. See:
+                # https://docs.python.org/3.8/library/ctypes.html
+                # https://github.com/python/cpython/blob/3.10/Lib/ctypes/__init__.py#L343
+                ctypes.CDLL(plugin_lib, winmode=0)
+            except TypeError:
+                # winmode only introduced in python 3.8
+                ctypes.CDLL(plugin_lib)
+            return
+
+    raise IOError(
+        "\n{}\n{}\n{}\n".format(
+            "Failed to load library ({}).".format(HARDMAX_PLUGIN_LIBRARY_NAME),
+            "Please build the Hardmax sample plugin.",
+            "For more information, see the included README.md",
+        )
+    )