| /* |
| * Copyright (C) 2023 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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. |
| */ |
| |
| #ifndef INCLUDE_PERFETTO_PUBLIC_ABI_PB_DECODER_ABI_H_ |
| #define INCLUDE_PERFETTO_PUBLIC_ABI_PB_DECODER_ABI_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include "perfetto/public/abi/export.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // Stores the state required to decode a protobuf message (from a continuous |
| // memory buffer). |
| struct PerfettoPbDecoder { |
| // Pointer to the beginning of the next field that should be decoded. |
| const uint8_t* read_ptr; |
| // Pointer to one past the end of the buffer. |
| const uint8_t* end_ptr; |
| }; |
| |
| enum PerfettoPbDecoderStatus { |
| // A field has been decoded correctly. There is more data into the buffer, |
| // starting from an updated `read_ptr`. |
| PERFETTO_PB_DECODER_OK = 0, |
| // The last field has been decoded correctly until the end. There is no more |
| // data into the buffer. |
| PERFETTO_PB_DECODER_DONE = 1, |
| // The data starting at `read_ptr` cannot be fully decoded as a protobuf |
| // field. `read_ptr` has not been updated. |
| PERFETTO_PB_DECODER_ERROR = 2, |
| }; |
| |
| // The content of a length-delimited field (wire type 2) |
| struct PerfettoPbDecoderDelimitedField { |
| const uint8_t* start; |
| size_t len; |
| }; |
| |
| // A field parsed by the decoder. |
| struct PerfettoPbDecoderField { |
| // PerfettoPbDecoderStatus |
| uint32_t status; |
| // PerfettoPbWireType |
| uint32_t wire_type; |
| // The protobuf field id. |
| uint32_t id; |
| // The value of this field. |
| union { |
| // For wire type 2. |
| struct PerfettoPbDecoderDelimitedField delimited; |
| // For wire type 0 and 1. |
| uint64_t integer64; |
| // For wire type 5. |
| uint32_t integer32; |
| // For wire type 1. |
| double double_val; |
| // For wire type 5. |
| float float_val; |
| } value; |
| }; |
| |
| // Parses a field and returns it. Advances `*decoder->read_ptr` to point after |
| // the field. |
| PERFETTO_SDK_EXPORT struct PerfettoPbDecoderField PerfettoPbDecoderParseField( |
| struct PerfettoPbDecoder* decoder); |
| |
| // Advances `*decoder->read_ptr` to point after the current field. |
| // Returns a `PerfettoPbDecoderStatus`. |
| PERFETTO_SDK_EXPORT uint32_t |
| PerfettoPbDecoderSkipField(struct PerfettoPbDecoder* decoder); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // INCLUDE_PERFETTO_PUBLIC_ABI_PB_DECODER_ABI_H_ |