nvsandboxutils: Add implementation for the APIs

This change adds manual wrappers around the generated bindings to make
them into more user-friendly APIs for the caller. Some helper functions
are also added.
The APIs that are currently present in the library and implemented here
are:
nvSandboxUtilsInit
nvSandboxUtilsShutdown
nvSandboxUtilsGetDriverVersion
nvSandboxUtilsGetGpuResource
nvSandboxUtilsGetFileContent

Signed-off-by: Evan Lezar <elezar@nvidia.com>
Signed-off-by: Huy Nguyen <huyn@nvidia.com>
Signed-off-by: Sananya Majumder <sananyam@nvidia.com>

internal/nvsandboxutils/impl.go

@@ -0,0 +1,64 @@
+/**
+# Copyright 2024 NVIDIA CORPORATION
+#
+# 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.
+**/
+
+package nvsandboxutils
+
+import "C"
+
+func (l *library) Init(path string) Ret {
+	if err := l.load(); err != nil {
+		return ERROR_LIBRARY_LOAD
+	}
+
+	input := InitInput{
+		Version: 1,
+		Type:    uint32(NV_ROOTFS_PATH),
+		Value:   convertStringToFixedArray(path),
+	}
+
+	return nvSandboxUtilsInit(&input)
+}
+
+func (l *library) Shutdown() Ret {
+	ret := nvSandboxUtilsShutdown()
+	if ret != SUCCESS {
+		return ret
+	}
+
+	err := l.close()
+	if err != nil {
+		return ERROR_UNKNOWN
+	}
+
+	return ret
+}
+
+// TODO: Is this length specified in the header file?
+const VERSION_LENGTH = 100
+
+func (l *library) GetDriverVersion() (string, Ret) {
+	Version := make([]byte, VERSION_LENGTH)
+	ret := nvSandboxUtilsGetDriverVersion(&Version[0], VERSION_LENGTH)
+	return string(Version[:clen(Version)]), ret
+}
+
+func (l *library) GetFileContent(path string) (string, Ret) {
+	Content := make([]byte, MAX_FILE_PATH)
+	FilePath := []byte(path + string(byte(0)))
+	Size := uint32(MAX_FILE_PATH)
+	ret := nvSandboxUtilsGetFileContent(&FilePath[0], &Content[0], &Size)
+	return string(Content[:clen(Content)]), ret
+}