974a9c2885
Implement ProtoOutputStream.h to write protobuf format data. Usage of dumping proto: ProtoOutputStream proto(fd); proto.write(fieldId, value1); // dump a single value // start to dump a message: long long token = proto.start(messageFieldId); proto.write(nestedField1, nestedValue1); ... proto.end(token); fieldId will be generated by protoc-cpp plugin(TBD). It is an encoded uint64_t value, with 0 - 32 bits as its proto number, 33 - 40 bits reserved for field type, int32, bool, string, message, etc. and 41 - 43 bits for single, repeated or packed type. Currently packed field is not supported. Bug: 65641021 Test: N/A, need to wait for protoc-cpp plugin and will test in incident_helper Change-Id: Ic188615b950235aae0edeee4876b78d31feb5619
70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
/*
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* Copyright (C) 2016 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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#include <android/util/protobuf.h>
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namespace android {
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namespace util {
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uint8_t
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read_wire_type(uint32_t varint)
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{
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return (uint8_t) (varint & WIRE_TYPE_MASK);
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}
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uint32_t
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read_field_id(uint32_t varint)
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{
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return varint >> FIELD_ID_SHIFT;
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}
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size_t
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get_varint_size(uint64_t varint)
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{
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size_t size = 1;
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while ((varint & ~0x7F)) {
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size++;
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varint >>= 7;
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}
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return size;
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}
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uint8_t*
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write_raw_varint(uint8_t* buf, uint64_t val)
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{
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uint8_t* p = buf;
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while (true) {
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if ((val & ~0x7F) == 0) {
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*p++ = (uint8_t)val;
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return p;
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} else {
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*p++ = (uint8_t)((val & 0x7F) | 0x80);
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val >>= 7;
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}
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}
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}
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uint8_t*
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write_length_delimited_tag_header(uint8_t* buf, uint32_t fieldId, size_t size)
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{
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buf = write_raw_varint(buf, (fieldId << FIELD_ID_SHIFT) | WIRE_TYPE_LENGTH_DELIMITED);
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buf = write_raw_varint(buf, size);
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return buf;
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}
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} // util
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} // android
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