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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2023
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/mtproto/TlsReaderByteFlow.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
namespace td {
namespace mtproto {
bool TlsReaderByteFlow::loop() {
if (input_->size() < 5) {
set_need_size(5);
return false;
}
auto it = input_->clone();
uint8 buf[5];
it.advance(5, MutableSlice(buf, 5));
if (Slice(buf, 3) != Slice("\x17\x03\x03")) {
close_input(Status::Error("Invalid bytes at the beginning of a packet (emulated tls)"));
return false;
}
size_t len = (buf[3] << 8) | buf[4];
if (it.size() < len) {
set_need_size(5 + len);
return false;
}
output_.append(it.cut_head(len));
*input_ = std::move(it);
return true;
}
} // namespace mtproto
} // namespace td
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