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63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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*/
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#pragma once
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#include "td/utils/buffer.h"
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#include "td/utils/Span.h"
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#include "td/fec/algebra/MatrixGF256.h"
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namespace td {
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class BeliefPropagationDecoding {
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public:
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explicit BeliefPropagationDecoding(size_t symbols_count, size_t symbol_size);
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void add_equation(Span<uint32> symbol_ids, Slice data);
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bool is_ready() const;
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Span<uint32> ready_symbols() const;
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Slice get_symbol(uint32 symbol_id) const;
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private:
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struct SymbolInfo {
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bool is_ready{false};
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uint32 head_ = 0;
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};
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struct EquationInfo {
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uint32 symbols_xor{0};
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uint32 symbols_count{0};
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};
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size_t max_equation_count_;
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MatrixGF256 C_;
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MatrixGF256 D_;
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std::vector<SymbolInfo> symbols_;
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std::vector<EquationInfo> equations_;
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std::vector<uint32> ready_equations_;
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std::vector<uint32> ready_symbols_;
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struct Edge {
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uint32 value;
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uint32 next;
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};
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std::vector<Edge> edges_;
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void loop();
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};
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} // namespace td
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