mirror of
https://github.com/danog/ton.git
synced 2024-12-11 16:49:37 +01:00
78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
/*
|
|
This file is part of TON Blockchain Library.
|
|
|
|
TON Blockchain Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
TON Blockchain Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
Copyright 2017-2019 Telegram Systems LLP
|
|
*/
|
|
#include "td/fec/online/Decoder.h"
|
|
|
|
namespace td {
|
|
namespace online_code {
|
|
Result<std::unique_ptr<Decoder>> Decoder::create(Encoder::Parameters p) {
|
|
return std::make_unique<Decoder>(p.symbol_size, p.data_size);
|
|
}
|
|
|
|
Decoder::Decoder(size_t symbol_size, size_t data_size)
|
|
: parameters_(Rfc::get_parameters((data_size + symbol_size - 1) / symbol_size).move_as_ok())
|
|
, symbol_size_(symbol_size)
|
|
, data_size_(data_size) {
|
|
MatrixGF256 d_{1, symbol_size_};
|
|
d_.set_zero();
|
|
std::vector<uint32> e_cnt(parameters_.outer_encoding_blocks_count(), 0);
|
|
std::vector<std::vector<uint32>> e(parameters_.outer_encoding_blocks_count());
|
|
parameters_.outer_encoding_for_each([&](uint32 i, uint32 j) { e_cnt[i]++; });
|
|
for (uint32 i = 0; i < parameters_.outer_encoding_blocks_count(); i++) {
|
|
e[i].reserve(e_cnt[i]);
|
|
}
|
|
parameters_.outer_encoding_for_each([&](uint32 i, uint32 j) { e[i].push_back(j); });
|
|
for (uint32 i = 0; i < parameters_.outer_encoding_blocks_count(); i++) {
|
|
decoding_.add_equation(e[i], d_.row(0));
|
|
}
|
|
}
|
|
|
|
Status Decoder::add_symbol(raptorq::SymbolRef symbol_ref) {
|
|
if (symbol_ref.data.size() != symbol_size_) {
|
|
return Status::Error("Symbol has invalid length");
|
|
}
|
|
|
|
auto offset = decoding_.ready_symbols().size();
|
|
decoding_.add_equation(parameters_.get_inner_encoding_row(symbol_ref.id), symbol_ref.data);
|
|
|
|
//LOG(ERROR) << inner_decoding_.ready_symbols().size();
|
|
for (auto symbol_id : decoding_.ready_symbols().substr(offset)) {
|
|
if (symbol_id < parameters_.source_blocks_count()) {
|
|
ready_cnt_++;
|
|
}
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
bool Decoder::is_ready() const {
|
|
return ready_cnt_ == parameters_.source_blocks_count();
|
|
}
|
|
|
|
BufferSlice Decoder::get_data() const {
|
|
CHECK(is_ready());
|
|
BufferSlice res(data_size_);
|
|
for (uint32 i = 0; i < parameters_.source_blocks_count(); i++) {
|
|
auto dest = res.as_slice().substr(i * symbol_size_);
|
|
dest.copy_from(decoding_.get_symbol(i).truncate(dest.size()));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
} // namespace online_code
|
|
} // namespace td
|