Add IMemoryToken and the HidlMemoryToken

The IMemoryToken is an interface which composes shared memory.
It provides a get() method, which returns an instance of hidl_memory
that always refer to the same memory.

The HidlMemoryToken is an implementation of the IMemoryToken.

Bug: 69640337
Test: hidl_test
Change-Id: Idf3a090213be8cb315134143cb81e1d7df91b4a2

1 files changed, 36 insertions, 0 deletions

diff --git a/libhidlmemory/include/hidlmemory/HidlMemoryToken.h b/libhidlmemory/include/hidlmemory/HidlMemoryToken.h
new file mode 100644
index 0000000..4020377
--- /dev/null
+++ b/libhidlmemory/include/hidlmemory/HidlMemoryToken.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+#ifndef ANDROID_HARDWARE_HIDLMEMORYTOKEN_H
+#define ANDROID_HARDWARE_HIDLMEMORYTOKEN_H
+
+#include <android/hidl/memory/token/1.0/IMemoryToken.h>
+
+namespace android {
+namespace hardware {
+
+class HidlMemoryToken : public virtual ::android::hidl::memory::token::V1_0::IMemoryToken {
+   public:
+    Return<void> get(get_cb _hidl_cb) override;
+
+    HidlMemoryToken(sp<HidlMemory> memory);
+
+   protected:
+    sp<HidlMemory> mMemory;
+};
+
+}  // namespace hardware
+}  // namespace android
+#endif