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/*
* Copyright 2019 Xilinx Inc.
*
* 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.
*/
#pragma once
#include <memory>
#include <vector>
#include <string>
namespace vitis {
namespace ai {
class VariableBitIterator {
public:
// std::unique_ptr<VariableBitIterator> create(char* data, size_t bit_width,
// size_t byte_offset, size_t bit_offset);
VariableBitIterator(unsigned char* data, size_t bit_width, size_t byte_offset,
size_t bit_offset);
public:
VariableBitIterator() = delete;
~VariableBitIterator() = default;
VariableBitIterator(const VariableBitIterator& other) = default;
VariableBitIterator& operator=(const VariableBitIterator& rhs) = default;
bool operator!=(const VariableBitIterator& rhs) { return !(*this == rhs); }
bool operator==(const VariableBitIterator& rhs) {
return true && data_ == rhs.data_ //
&& byte_offset_ == rhs.byte_offset_ //
&& bit_offset_ == rhs.bit_offset_ //
&& bit_width_ == rhs.bit_width_;
}
VariableBitIterator operator++() {
*this = this->next(1u);
return *this;
}
VariableBitIterator operator+(size_t offset_in_elt) {
// *this = this->next(offset_in_elt);
// return *this;
return this->next(offset_in_elt);
}
size_t operator*() { return get(); }
public:
public:
size_t mask(size_t num_of_bits) const;
std::pair<size_t, size_t> read(size_t byte_offset, size_t bit_offset,
size_t num_of_bits);
size_t write(size_t byte_offset, size_t bit_offset, size_t num_of_bits,
size_t val);
size_t get();
void set(size_t val);
VariableBitIterator next(size_t n_of_element = 1u);
std::string to_string() const;
private:
unsigned char* data_;
size_t bit_width_;
size_t byte_offset_;
size_t bit_offset_;
};
class VariableBitView {
public:
VariableBitView(unsigned char* data, size_t bit_width, const size_t elements)
: data_{data}, bit_width_{bit_width}, elements_{elements} {}
VariableBitIterator begin() {
return VariableBitIterator(&data_[0], bit_width_, 0u, 0u);
}
VariableBitIterator end() { return begin().next(elements_); }
public:
unsigned char* data_;
size_t bit_width_;
size_t elements_;
};
} // namespace ai
} // namespace vitis
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