tdlight/td/tl/tl_object_parse.h
2023-01-01 00:28:08 +03:00

148 lines
3.2 KiB
C++

//
// 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)
//
#pragma once
#include "td/tl/TlObject.h"
#include "td/utils/SliceBuilder.h"
#include "td/utils/UInt.h"
#include <cstdint>
#include <string>
#include <vector>
namespace td {
template <class Func, std::int32_t constructor_id>
class TlFetchBoxed {
public:
template <class ParserT>
static auto parse(ParserT &parser) -> decltype(Func::parse(parser)) {
auto parsed_constructor_id = parser.fetch_int();
if (parsed_constructor_id != constructor_id) {
parser.set_error(PSTRING() << "Wrong constructor " << parsed_constructor_id << " found instead of "
<< constructor_id);
return decltype(Func::parse(parser))();
}
return Func::parse(parser);
}
};
class TlFetchTrue {
public:
template <class ParserT>
static bool parse(ParserT &parser) {
return true;
}
};
class TlFetchBool {
public:
template <class ParserT>
static bool parse(ParserT &parser) {
constexpr std::int32_t ID_BOOL_FALSE = 0xbc799737;
constexpr std::int32_t ID_BOOL_TRUE = 0x997275b5;
std::int32_t c = parser.fetch_int();
if (c == ID_BOOL_TRUE) {
return true;
}
if (c != ID_BOOL_FALSE) {
parser.set_error("Bool expected");
}
return false;
}
};
class TlFetchInt {
public:
template <class ParserT>
static std::int32_t parse(ParserT &parser) {
return parser.fetch_int();
}
};
class TlFetchLong {
public:
template <class ParserT>
static std::int64_t parse(ParserT &parser) {
return parser.fetch_long();
}
};
class TlFetchDouble {
public:
template <class ParserT>
static double parse(ParserT &parser) {
return parser.fetch_double();
}
};
class TlFetchInt128 {
public:
template <class ParserT>
static UInt128 parse(ParserT &parser) {
return parser.template fetch_binary<UInt128>();
}
};
class TlFetchInt256 {
public:
template <class ParserT>
static UInt256 parse(ParserT &parser) {
return parser.template fetch_binary<UInt256>();
}
};
template <class T>
class TlFetchString {
public:
template <class ParserT>
static T parse(ParserT &parser) {
return parser.template fetch_string<T>();
}
};
template <class T>
class TlFetchBytes {
public:
template <class ParserT>
static T parse(ParserT &parser) {
return parser.template fetch_string<T>();
}
};
template <class Func>
class TlFetchVector {
public:
template <class ParserT>
static auto parse(ParserT &parser) -> std::vector<decltype(Func::parse(parser))> {
const std::uint32_t multiplicity = parser.fetch_int();
std::vector<decltype(Func::parse(parser))> v;
if (parser.get_left_len() < multiplicity) {
parser.set_error("Wrong vector length");
} else {
v.reserve(multiplicity);
for (std::uint32_t i = 0; i < multiplicity; i++) {
v.push_back(Func::parse(parser));
}
}
return v;
}
};
template <class T>
class TlFetchObject {
public:
template <class ParserT>
static tl_object_ptr<T> parse(ParserT &parser) {
return T::fetch(parser);
}
};
} // namespace td