42711a0b4f
The in-place algorithm in ProtoOutputStream will have at most 2 copies of possible nested message values incidentd is getting which makes it more ram-efficient, and minimize allocations. Bug: 65641021 Test: the units pass Change-Id: Ic3fe99b7e27895bd613a129ba0f12ccfca4af317
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_UTIL_PROTOOUTPUT_STREAM_H
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#define ANDROID_UTIL_PROTOOUTPUT_STREAM_H
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#include <android/util/EncodedBuffer.h>
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#include <stdint.h>
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#include <string>
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namespace android {
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namespace util {
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/**
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* Class to write to a protobuf stream.
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*
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* Each write method takes an ID code from the protoc generated classes
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* and the value to write. To make a nested object, call start
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* and then end when you are done.
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*
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* See the java version implementation (ProtoOutputStream.java) for more infos.
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*/
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class ProtoOutputStream
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{
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public:
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ProtoOutputStream();
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~ProtoOutputStream();
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/**
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* Write APIs for dumping protobuf data. Returns true if the write succeeds.
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*/
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bool write(uint64_t fieldId, double val);
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bool write(uint64_t fieldId, float val);
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bool write(uint64_t fieldId, int val);
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bool write(uint64_t fieldId, long long val);
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bool write(uint64_t fieldId, bool val);
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bool write(uint64_t fieldId, std::string val);
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bool write(uint64_t fieldId, const char* val);
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/**
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* Starts a sub-message write session.
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* Returns a token of this write session.
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* Must call end(token) when finish write this sub-message.
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*/
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long long start(uint64_t fieldId);
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void end(long long token);
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/**
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* Flushes the protobuf data out to given fd.
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*/
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size_t size();
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EncodedBuffer::iterator data();
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bool flush(int fd);
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// Please don't use the following functions to dump protos unless you are sure about it.
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void writeRawVarint(uint64_t varint);
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void writeLengthDelimitedHeader(uint32_t id, size_t size);
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void writeRawByte(uint8_t byte);
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private:
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EncodedBuffer mBuffer;
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size_t mCopyBegin;
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bool mCompact;
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int mDepth;
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int mObjectId;
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long long mExpectedObjectToken;
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inline void writeDoubleImpl(uint32_t id, double val);
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inline void writeFloatImpl(uint32_t id, float val);
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inline void writeInt64Impl(uint32_t id, long long val);
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inline void writeInt32Impl(uint32_t id, int val);
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inline void writeUint64Impl(uint32_t id, uint64_t val);
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inline void writeUint32Impl(uint32_t id, uint32_t val);
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inline void writeFixed64Impl(uint32_t id, uint64_t val);
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inline void writeFixed32Impl(uint32_t id, uint32_t val);
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inline void writeSFixed64Impl(uint32_t id, long long val);
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inline void writeSFixed32Impl(uint32_t id, int val);
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inline void writeZigzagInt64Impl(uint32_t id, long long val);
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inline void writeZigzagInt32Impl(uint32_t id, int val);
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inline void writeEnumImpl(uint32_t id, int val);
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inline void writeBoolImpl(uint32_t id, bool val);
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inline void writeUtf8StringImpl(uint32_t id, const char* val, size_t size);
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bool compact();
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size_t editEncodedSize(size_t rawSize);
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bool compactSize(size_t rawSize);
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};
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}
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}
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#endif // ANDROID_UTIL_PROTOOUTPUT_STREAM_H
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