1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACING_CORE_SLICED_PROTOBUF_INPUT_STREAM_H_ 18 #define SRC_TRACING_CORE_SLICED_PROTOBUF_INPUT_STREAM_H_ 19 20 #include "perfetto/tracing/core/slice.h" 21 22 #include <stdint.h> 23 24 #include "google/protobuf/io/zero_copy_stream.h" 25 26 namespace perfetto { 27 28 // Wraps a sequence of Slice(s) in a protobuf ZeroCopyInputStream that can be 29 // passed to protobuf::Message::ParseFromZeroCopyStream(). 30 class SlicedProtobufInputStream 31 : public google::protobuf::io::ZeroCopyInputStream { 32 public: 33 explicit SlicedProtobufInputStream(const Slices*); 34 ~SlicedProtobufInputStream() override; 35 36 // ZeroCopyInputStream implementation. See zero_copy_stream.h for the API 37 // contract of the methods below. 38 bool Next(const void** data, int* size) override; 39 void BackUp(int count) override; 40 bool Skip(int count) override; 41 google::protobuf::int64 ByteCount() const override; 42 43 private: 44 bool Validate() const; 45 46 const Slices* const slices_; 47 Slices::const_iterator cur_slice_; 48 size_t pos_in_cur_slice_ = 0; 49 }; 50 51 } // namespace perfetto 52 53 #endif // SRC_TRACING_CORE_SLICED_PROTOBUF_INPUT_STREAM_H_ 54
