| // Copyright 2021 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. |
| |
| // Configuration macros for the protobuf module. |
| #pragma once |
| |
| #include <cstddef> |
| |
| // When encoding nested messages, the number of bytes to reserve for the varint |
| // submessage length. Nested messages are limited in size to the maximum value |
| // that can be varint-encoded into this reserved space. |
| // |
| // The values that can be set, and their corresponding maximum submessage |
| // lengths, are outlined below. |
| // |
| // 1 byte => 127 |
| // 2 bytes => 16,383 or < 16KiB |
| // 3 bytes => 2,097,151 or < 2048KiB |
| // 4 bytes => 268,435,455 or < 256MiB |
| // 5 bytes => 4,294,967,295 or < 4GiB (max uint32_t) |
| // |
| #ifndef PW_PROTOBUF_CFG_MAX_VARINT_SIZE |
| #define PW_PROTOBUF_CFG_MAX_VARINT_SIZE 4 |
| #endif // PW_PROTOBUF_MAX_VARINT_SIZE |
| |
| static_assert(PW_PROTOBUF_CFG_MAX_VARINT_SIZE > 0 && |
| PW_PROTOBUF_CFG_MAX_VARINT_SIZE <= 5); |
| |
| namespace pw::protobuf::config { |
| |
| inline constexpr size_t kMaxVarintSize = PW_PROTOBUF_CFG_MAX_VARINT_SIZE; |
| |
| } // namespace pw::protobuf::config |
