1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* Copyright (C) 2017 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 ANDROID_UTIL_PROTOOUTPUT_STREAM_H
#define ANDROID_UTIL_PROTOOUTPUT_STREAM_H
#include <android/util/EncodedBuffer.h>
#include <string>
namespace android {
namespace util {
/**
* Position of the field type in a (long long) fieldId.
*/
const uint64_t FIELD_TYPE_SHIFT = 32;
/**
* Mask for the field types stored in a fieldId. Leaves a whole
* byte for future expansion, even though there are currently only 17 types.
*/
const uint64_t FIELD_TYPE_MASK = 0x0ffULL << FIELD_TYPE_SHIFT;
/**
* The types are copied from external/protobuf/src/google/protobuf/descriptor.h directly,
* so no extra mapping needs to be maintained in this case.
*/
const uint64_t FIELD_TYPE_UNKNOWN = 0;
const uint64_t FIELD_TYPE_DOUBLE = 1ULL << FIELD_TYPE_SHIFT; // double, exactly eight bytes on the wire.
const uint64_t FIELD_TYPE_FLOAT = 2ULL << FIELD_TYPE_SHIFT; // float, exactly four bytes on the wire.
const uint64_t FIELD_TYPE_INT64 = 3ULL << FIELD_TYPE_SHIFT; // int64, varint on the wire. Negative numbers
// take 10 bytes. Use TYPE_SINT64 if negative
// values are likely.
const uint64_t FIELD_TYPE_UINT64 = 4ULL << FIELD_TYPE_SHIFT; // uint64, varint on the wire.
const uint64_t FIELD_TYPE_INT32 = 5ULL << FIELD_TYPE_SHIFT; // int32, varint on the wire. Negative numbers
// take 10 bytes. Use TYPE_SINT32 if negative
// values are likely.
const uint64_t FIELD_TYPE_FIXED64 = 6ULL << FIELD_TYPE_SHIFT; // uint64, exactly eight bytes on the wire.
const uint64_t FIELD_TYPE_FIXED32 = 7ULL << FIELD_TYPE_SHIFT; // uint32, exactly four bytes on the wire.
const uint64_t FIELD_TYPE_BOOL = 8ULL << FIELD_TYPE_SHIFT; // bool, varint on the wire.
const uint64_t FIELD_TYPE_STRING = 9ULL << FIELD_TYPE_SHIFT; // UTF-8 text.
// const uint64_t FIELD_TYPE_GROUP = 10ULL << FIELD_TYPE_SHIFT; // Tag-delimited message. Deprecated.
const uint64_t FIELD_TYPE_MESSAGE = 11ULL << FIELD_TYPE_SHIFT; // Length-delimited message.
const uint64_t FIELD_TYPE_BYTES = 12ULL << FIELD_TYPE_SHIFT; // Arbitrary byte array.
const uint64_t FIELD_TYPE_UINT32 = 13ULL << FIELD_TYPE_SHIFT; // uint32, varint on the wire
const uint64_t FIELD_TYPE_ENUM = 14ULL << FIELD_TYPE_SHIFT; // Enum, varint on the wire
const uint64_t FIELD_TYPE_SFIXED32 = 15ULL << FIELD_TYPE_SHIFT; // int32, exactly four bytes on the wire
const uint64_t FIELD_TYPE_SFIXED64 = 16ULL << FIELD_TYPE_SHIFT; // int64, exactly eight bytes on the wire
const uint64_t FIELD_TYPE_SINT32 = 17ULL << FIELD_TYPE_SHIFT; // int32, ZigZag-encoded varint on the wire
const uint64_t FIELD_TYPE_SINT64 = 18ULL << FIELD_TYPE_SHIFT; // int64, ZigZag-encoded varint on the wire
//
// FieldId flags for whether the field is single, repeated or packed.
// TODO: packed is not supported yet.
//
const uint64_t FIELD_COUNT_SHIFT = 40;
const uint64_t FIELD_COUNT_MASK = 0x0fULL << FIELD_COUNT_SHIFT;
const uint64_t FIELD_COUNT_UNKNOWN = 0;
const uint64_t FIELD_COUNT_SINGLE = 1ULL << FIELD_COUNT_SHIFT;
const uint64_t FIELD_COUNT_REPEATED = 2ULL << FIELD_COUNT_SHIFT;
const uint64_t FIELD_COUNT_PACKED = 5ULL << FIELD_COUNT_SHIFT;
/**
* Class to write to a protobuf stream.
*
* Each write method takes an ID code from the protoc generated classes
* and the value to write. To make a nested object, call start
* and then end when you are done.
*
* See the java version implementation (ProtoOutputStream.java) for more infos.
*/
class ProtoOutputStream
{
public:
ProtoOutputStream();
~ProtoOutputStream();
/**
* Write APIs for dumping protobuf data. Returns true if the write succeeds.
*/
bool write(uint64_t fieldId, double val);
bool write(uint64_t fieldId, float val);
bool write(uint64_t fieldId, int val);
bool write(uint64_t fieldId, long long val);
bool write(uint64_t fieldId, bool val);
bool write(uint64_t fieldId, std::string val);
bool write(uint64_t fieldId, const char* val, size_t size);
/**
* Starts a sub-message write session.
* Returns a token of this write session.
* Must call end(token) when finish write this sub-message.
*/
long long start(uint64_t fieldId);
void end(long long token);
/**
* Flushes the protobuf data out to given fd. When the following functions are called,
* it is not able to write to ProtoOutputStream any more since the data is compact.
*/
size_t size(); // Get the size of the serialized protobuf.
EncodedBuffer::iterator data(); // Get the reader apis of the data.
bool flush(int fd); // Flush data directly to a file descriptor.
// Please don't use the following functions to dump protos unless you are familiar with protobuf encoding.
void writeRawVarint(uint64_t varint);
void writeLengthDelimitedHeader(uint32_t id, size_t size);
void writeRawByte(uint8_t byte);
private:
EncodedBuffer mBuffer;
size_t mCopyBegin;
bool mCompact;
int mDepth;
int mObjectId;
long long mExpectedObjectToken;
inline void writeDoubleImpl(uint32_t id, double val);
inline void writeFloatImpl(uint32_t id, float val);
inline void writeInt64Impl(uint32_t id, long long val);
inline void writeInt32Impl(uint32_t id, int val);
inline void writeUint64Impl(uint32_t id, uint64_t val);
inline void writeUint32Impl(uint32_t id, uint32_t val);
inline void writeFixed64Impl(uint32_t id, uint64_t val);
inline void writeFixed32Impl(uint32_t id, uint32_t val);
inline void writeSFixed64Impl(uint32_t id, long long val);
inline void writeSFixed32Impl(uint32_t id, int val);
inline void writeZigzagInt64Impl(uint32_t id, long long val);
inline void writeZigzagInt32Impl(uint32_t id, int val);
inline void writeEnumImpl(uint32_t id, int val);
inline void writeBoolImpl(uint32_t id, bool val);
inline void writeUtf8StringImpl(uint32_t id, const char* val, size_t size);
inline void writeMessageBytesImpl(uint32_t id, const char* val, size_t size);
bool compact();
size_t editEncodedSize(size_t rawSize);
bool compactSize(size_t rawSize);
};
}
}
#endif // ANDROID_UTIL_PROTOOUTPUT_STREAM_H
|
