tdlight/td/mtproto/utils.h

104 lines
2.7 KiB
C
Raw Normal View History

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// 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)
//
#pragma once
#include "td/utils/buffer.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/Storer.h"
#include "td/utils/tl_parsers.h"
#include "td/utils/tl_storers.h"
#include <limits>
namespace td {
template <class T>
Result<typename T::ReturnType> fetch_result(Slice message, bool check_end = true) {
TlParser parser(message);
auto result = T::fetch_result(parser);
if (check_end) {
parser.fetch_end();
}
const char *error = parser.get_error();
if (error != nullptr) {
LOG(ERROR) << "Can't parse: " << format::as_hex_dump<4>(message);
return Status::Error(500, Slice(error));
}
return std::move(result);
}
template <class T>
Result<typename T::ReturnType> fetch_result(const BufferSlice &message, bool check_end = true) {
TlBufferParser parser(&message);
auto result = T::fetch_result(parser);
if (check_end) {
parser.fetch_end();
}
const char *error = parser.get_error();
if (error != nullptr) {
LOG(ERROR) << "Can't parse: " << format::as_hex_dump<4>(message.as_slice());
return Status::Error(500, Slice(error));
}
return std::move(result);
}
template <class T>
using TLStorer = DefaultStorer<T>;
template <class T>
class TLObjectStorer : public Storer {
mutable size_t size_ = std::numeric_limits<size_t>::max();
const T &object_;
public:
explicit TLObjectStorer(const T &object) : object_(object) {
}
size_t size() const override {
if (size_ == std::numeric_limits<size_t>::max()) {
TlStorerCalcLength storer;
storer.store_binary(object_.get_id());
object_.store(storer);
size_ = storer.get_length();
}
return size_;
}
size_t store(uint8 *ptr) const override {
TlStorerUnsafe storer(ptr);
storer.store_binary(object_.get_id());
object_.store(storer);
return static_cast<size_t>(storer.get_buf() - ptr);
}
};
namespace mtproto_api {
class Object;
class Function;
} // namespace mtproto_api
namespace telegram_api {
class Object;
class Function;
} // namespace telegram_api
TLStorer<mtproto_api::Function> create_storer(const mtproto_api::Function &function);
TLStorer<telegram_api::Function> create_storer(const telegram_api::Function &function);
TLObjectStorer<mtproto_api::Object> create_storer(const mtproto_api::Object &object);
TLObjectStorer<telegram_api::Object> create_storer(const telegram_api::Object &object);
} // namespace td