ton/tl-utils/lite-utils.cpp

/*
    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 "tl-utils.hpp"
#include "tl/tl_object_store.h"
#include "auto/tl/lite_api.hpp"
#include "td/utils/tl_storers.h"
#include "td/utils/crypto.h"
#include "crypto/common/bitstring.h"

namespace ton {

td::BufferSlice serialize_tl_object(const lite_api::Object *T, bool boxed, td::BufferSlice &&suffix) {
  td::TlStorerCalcLength X;
  T->store(X);
  auto l = X.get_length() + (boxed ? 4 : 0);
  auto len = l + suffix.size();

  td::BufferSlice B(len);
  td::TlStorerUnsafe Y(B.as_slice().ubegin());
  if (boxed) {
    Y.store_binary(T->get_id());
  }
  T->store(Y);

  auto S = B.as_slice();
  S.remove_prefix(l);
  S.copy_from(suffix.as_slice());
  suffix.clear();

  return B;
}

td::BufferSlice serialize_tl_object(const lite_api::Object *T, bool boxed) {
  td::TlStorerCalcLength X;
  T->store(X);
  auto l = X.get_length() + (boxed ? 4 : 0);
  auto len = l;

  td::BufferSlice B(len);
  td::TlStorerUnsafe Y(B.as_slice().ubegin());
  if (boxed) {
    Y.store_binary(T->get_id());
  }
  T->store(Y);

  return B;
}

td::BufferSlice serialize_tl_object(const lite_api::Function *T, bool boxed) {
  CHECK(boxed);
  td::TlStorerCalcLength X;
  T->store(X);
  auto l = X.get_length();
  auto len = l;

  td::BufferSlice B(len);
  td::TlStorerUnsafe Y(B.as_slice().ubegin());

  T->store(Y);

  return B;
}

td::BufferSlice serialize_tl_object(const lite_api::Function *T, bool boxed, td::BufferSlice &&suffix) {
  CHECK(boxed);
  td::TlStorerCalcLength X;
  T->store(X);
  auto l = X.get_length();
  auto len = l + suffix.size();

  td::BufferSlice B(len);
  td::TlStorerUnsafe Y(B.as_slice().ubegin());

  T->store(Y);

  auto S = B.as_slice();
  S.remove_prefix(l);
  S.copy_from(suffix.as_slice());
  suffix.clear();

  return B;
}

td::UInt256 get_tl_object_sha256(const lite_api::Object *T) {
  td::TlStorerCalcLength X;
  T->store(X);
  auto len = X.get_length() + 4;

  td::BufferSlice B(len);
  td::TlStorerUnsafe Y(B.as_slice().ubegin());
  Y.store_binary(T->get_id());
  T->store(Y);

  td::UInt256 id256;
  td::sha256(B.as_slice(), id256.as_slice());

  return id256;
}

td::Bits256 get_tl_object_sha_bits256(const lite_api::Object *T) {
  td::TlStorerCalcLength X;
  T->store(X);
  auto len = X.get_length() + 4;

  td::BufferSlice B(len);
  td::TlStorerUnsafe Y(B.as_slice().ubegin());
  Y.store_binary(T->get_id());
  T->store(Y);

  td::Bits256 id256;
  td::sha256(B.as_slice(), id256.as_slice());

  return id256;
}

}  // namespace ton