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// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include <cstdint>
namespace pw::protobuf {
// Per the protobuf specification, valid field numbers range between 1 and
// 2**29 - 1, inclusive. The numbers 19000-19999 are reserved for internal
// use.
constexpr static uint32_t kMaxFieldNumber = (1u << 29) - 1;
constexpr static uint32_t kFirstReservedNumber = 19000;
constexpr static uint32_t kLastReservedNumber = 19999;
enum class WireType {
kVarint = 0,
kFixed64 = 1,
kDelimited = 2,
// Wire types 3 and 4 are deprecated per the protobuf specification.
kFixed32 = 5,
};
inline constexpr unsigned int kFieldNumberShift = 3u;
inline constexpr unsigned int kWireTypeMask = (1u << kFieldNumberShift) - 1u;
constexpr uint32_t MakeKey(uint32_t field_number, WireType wire_type) {
return (field_number << kFieldNumberShift | static_cast<uint32_t>(wire_type));
}
constexpr bool ValidFieldNumber(uint32_t field_number) {
return field_number != 0 && field_number <= kMaxFieldNumber &&
!(field_number >= kFirstReservedNumber &&
field_number <= kLastReservedNumber);
}
} // namespace pw::protobuf