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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * 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.
+ */
+
+/**
+ * @file View.h
+ * @ingroup COM_AI_RUNTIME
+ * @brief This file defines internal::nnapi::tensor::View class
+ */
+#ifndef __INTERNAL_NNAPI_TENSOR_VIEW_H__
+#define __INTERNAL_NNAPI_TENSOR_VIEW_H__
+
+#include "misc/tensor/Shape.h"
+#include "misc/tensor/Index.h"
+
+namespace internal
+{
+namespace nnapi
+{
+namespace tensor
+{
+
+/**
+ * @brief Class to access tensor's element information using index
+ */
+template <typename T> class View
+{
+public:
+ /**
+ * @brief Construct a new View object
+ * @param[in] shape Shape of tensor
+ * @param[in] ptr Pointer to tensor data
+ * @param[in] len Size of tensor (byte)
+ */
+ // NOTE The parameter len denotes the number of bytes.
+ View(const ::nnfw::misc::tensor::Shape &shape, T *ptr, size_t len) : _shape{shape}, _ptr{ptr}
+ {
+ assert(shape.num_elements() * sizeof(T) == len);
+ }
+
+public:
+ /**
+ * @brief Get shape of tensor
+ * @return Shape of tensor
+ */
+ const nnfw::misc::tensor::Shape &shape(void) const { return _shape; }
+
+private:
+ /**
+ * @brief Get position of element using index in tensor
+ * @param[in] index Index of element
+ * @return Position of element
+ */
+ uint32_t offset_of(const nnfw::misc::tensor::Index &index) const
+ {
+ if (_shape.rank() == 0)
+ {
+ return 0;
+ }
+
+ uint32_t offset = index.at(0);
+
+ // Stride decreases as axis increases in NNAPI
+ for (uint32_t axis = 1; axis < _shape.rank(); ++axis)
+ {
+ offset *= _shape.dim(axis);
+ offset += index.at(axis);
+ }
+
+ return offset;
+ }
+
+public:
+ /**
+ * @brief Get value of element at index
+ * @param[in] index Index of element
+ * @return Value of element at index
+ */
+ T at(const nnfw::misc::tensor::Index &index) const
+ {
+ const auto offset = offset_of(index);
+
+ return _ptr[offset];
+ }
+
+ /**
+ * @brief Get reference of element at index
+ * @param[in] index Index of element
+ * @return Reference of element at index
+ */
+ T &at(const nnfw::misc::tensor::Index &index)
+ {
+ const auto offset = offset_of(index);
+
+ return _ptr[offset];
+ }
+
+private:
+ nnfw::misc::tensor::Shape _shape;
+
+private:
+ T *_ptr;
+};
+
+} // namespace tensor
+} // namespace nnapi
+} // namespace internal
+
+#endif // __INTERNAL_NNAPI_TENSOR_VIEW_H__