mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
43 lines
1.5 KiB
C++
43 lines
1.5 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 2017-2020 Telegram Systems LLP
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*/
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#include "FecHelper.h"
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#include "td/utils/check.h"
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namespace ton {
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namespace rldp2 {
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td::uint32 FecHelper::get_fec_symbols_count() const {
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constexpr td::uint32 x = 5;
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constexpr td::uint32 y = 5;
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// smallest (symbols_count + x + y * i) > received_symbols_count
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if (symbols_count + x > received_symbols_count) {
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return symbols_count + x;
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}
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td::uint32 i = (received_symbols_count - (symbols_count + x)) / y + 1;
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return symbols_count + x + i * y;
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}
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td::uint32 FecHelper::get_left_fec_symbols_count() const {
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auto fec_symbols_count = get_fec_symbols_count();
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CHECK(fec_symbols_count > received_symbols_count);
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return fec_symbols_count - received_symbols_count;
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}
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} // namespace rldp2
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} // namespace ton
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