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64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
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/*
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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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#include "td/fec/online/Encoder.h"
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#include "td/fec/common/SymbolsView.h"
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namespace td {
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namespace online_code {
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Result<std::unique_ptr<Encoder>> Encoder::create(size_t symbol_size, BufferSlice data) {
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return std::make_unique<Encoder>(symbol_size, data.as_slice());
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}
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Encoder::Encoder(size_t symbol_size, Slice data)
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: parameters_(Rfc::get_parameters((data.size() + symbol_size - 1) / symbol_size).move_as_ok())
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, C_(parameters_.source_blocks_count() + parameters_.outer_encoding_blocks_count(), symbol_size)
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, d_(1, symbol_size)
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, data_size_(data.size()) {
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raptorq::SymbolsView view(parameters_.source_blocks_count() + parameters_.outer_encoding_blocks_count(), symbol_size,
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data);
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for (auto &symbol : view.symbols()) {
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C_.row_set(symbol.id, symbol.data);
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}
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parameters_.outer_encoding_for_each([&](uint32 i, uint32 j) {
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if (j < parameters_.source_blocks_count()) {
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C_.row_add(i + parameters_.source_blocks_count(), C_.row(j));
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}
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});
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}
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Encoder::Parameters Encoder::get_parameters() const {
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Parameters p;
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p.symbols_count = parameters_.source_blocks_count();
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p.symbol_size = C_.cols();
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p.data_size = data_size_;
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return p;
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}
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Status Encoder::gen_symbol(uint32 symbol_id, MutableSlice slice) {
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d_.set_zero();
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for (auto id : parameters_.get_inner_encoding_row(symbol_id)) {
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d_.row_add(0, C_.row(id));
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}
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slice.copy_from(d_.row(0));
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return Status::OK();
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}
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} // namespace online_code
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} // namespace td
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