mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
46 lines
1.6 KiB
C++
46 lines
1.6 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 "td/fec/common/SymbolsView.h"
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namespace td {
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namespace raptorq {
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SymbolsView::SymbolsView(size_t symbols_count, size_t symbol_size, Slice data) {
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symbols_.reserve(symbols_count);
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zero_symbol_ = std::string(symbol_size, '\0');
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last_symbol_ = std::string(symbol_size, '\0');
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for (uint32 symbol_i = 0; symbol_i < symbols_count; symbol_i++) {
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auto offset = symbol_i * symbol_size;
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Slice symbol;
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if (offset < data.size()) {
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symbol = data.substr(offset).truncate(symbol_size);
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}
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Slice slice;
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if (symbol.empty()) {
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slice = zero_symbol_;
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} else if (symbol.size() < symbol_size) {
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MutableSlice(last_symbol_).copy_from(symbol);
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slice = last_symbol_;
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} else {
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slice = symbol;
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}
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symbols_.push_back(SymbolRef{symbol_i, slice});
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}
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}
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} // namespace raptorq
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} // namespace td
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