diff --git a/libhidlcache/include/hidlcache/MemoryDealer.h b/libhidlcache/include/hidlcache/MemoryDealer.h
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+/*
+ * Copyright (C) 2007 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_HIDL_MEMORY_DEALER_H
+#define ANDROID_HIDL_MEMORY_DEALER_H
+
+#include <android/hidl/memory/1.0/IMemory.h>
+#include <android/hidl/memory/block/1.0/types.h>
+#include <stdint.h>
+#include <sys/types.h>
+namespace android {
+namespace hardware {
+
+class SimpleBestFitAllocator;
+
+// MemoryDealer allocates/deallocates blocks from a continuous memory region.
+// It operates on size and offset and does not depend on any specific data types.
+class MemoryDealer : public RefBase {
+   public:
+    /// Allocate a block with size. The allocated block is identified with an
+    /// offset. For example:
+    /// ssize_t K = dealer->allocateOffset(size);
+    /// On success, K is positive and points to a subregion K ~ (K+size-1) in the heap.
+    /// It's negative if the allocation fails.
+    virtual ssize_t allocateOffset(size_t size);
+    /// @param offset It points to the block that allocated with allocateOffset previously.
+    virtual void deallocate(size_t offset);
+    /// @param tag a string tag used to mark the dump message
+    virtual void dump(const char* tag) const;
+
+    // allocations are aligned to some value. return that value so clients can account for it.
+    static size_t getAllocationAlignment();
+
+    MemoryDealer(size_t size);
+    virtual ~MemoryDealer();
+
+   protected:
+    SimpleBestFitAllocator* mAllocator;
+};
+
+// It extends the generic MemoryDealer and uses
+//  - sp<IMemory> to represent the main memory region.
+//  - MemoryBlock to represent the the block to allocate/deallocate
+class HidlMemoryDealer : public MemoryDealer {
+    using IMemory = ::android::hidl::memory::V1_0::IMemory;
+    using IMemoryToken = ::android::hidl::memory::token::V1_0::IMemoryToken;
+    using MemoryBlock = ::android::hidl::memory::block::V1_0::MemoryBlock;
+
+   public:
+    static bool isOk(const MemoryBlock& memblk);
+    /// @param memory The memory size must align to 4096 bytes
+    static sp<HidlMemoryDealer> getInstance(const hidl_memory& memory);
+    virtual MemoryBlock allocate(size_t size);
+    virtual sp<IMemory> heap();
+
+   protected:
+    /// @param heap It must be acquired with mapMemory(memory) with its
+    /// argument corresponds to the 2nd argument passed to HidlMemoryDealer.
+    HidlMemoryDealer(sp<IMemory> heap, const hidl_memory& memory);
+    sp<IMemory> mHeap;
+    sp<IMemoryToken> mToken;
+};
+
+};  // namespace hardware
+};  // namespace android
+
+#endif  // ANDROID_HIDL_MEMORY_DEALER_H