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
|
#include "state.h"
#include <library/cpp/xdelta3/state/hash.h>
#include <library/cpp/xdelta3/xdelta_codec/codec.h>
#include <util/stream/null.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
namespace NXdeltaAggregateColumn {
size_t SizeOfHeaderSize(size_t headerSize)
{
using namespace NProtoBuf::io;
ui32 dummy = 0;
auto data = reinterpret_cast<ui8*>(&dummy);
return CodedOutputStream::WriteVarint32ToArray(headerSize, data) - data;
}
size_t SizeOfHeader(const TStateHeader& header)
{
// length of header + calculated length
auto headerSize = header.ByteSize();
return SizeOfHeaderSize(headerSize) + headerSize;
}
TStateHeader* ParseHeader(NProtoBuf::Arena& arena, const ui8* data, size_t size)
{
using namespace NProtoBuf::io;
auto header = NProtoBuf::Arena::CreateMessage<TStateHeader>(&arena);
if (nullptr == data || 0 == size) {
header->set_error_code(TStateHeader::HEADER_PARSE_ERROR);
return header;
}
ui32 headerSize = 0;
CodedInputStream in(data, size);
if (in.ReadVarint32(&headerSize)) {
auto sizeofHeaderSize = in.CurrentPosition();
if (size - sizeofHeaderSize < headerSize) {
header->set_error_code(TStateHeader::HEADER_PARSE_ERROR);
return header;
}
if (!header->ParseFromArray(data + sizeofHeaderSize, headerSize)) {
header->Clear();
header->set_error_code(TStateHeader::HEADER_PARSE_ERROR);
}
} else {
header->set_error_code(TStateHeader::HEADER_PARSE_ERROR);
}
return header;
}
bool EncodeHeaderTo(const TStateHeader& header, ui8* data, size_t size, size_t& resultSize)
{
using namespace NProtoBuf::io;
resultSize = 0;
auto headerSize = header.ByteSize();
auto sizeOfHeaderSize = SizeOfHeaderSize(headerSize);
if (header.SerializeToArray(data + sizeOfHeaderSize, size - sizeOfHeaderSize)) {
sizeOfHeaderSize = CodedOutputStream::WriteVarint32ToArray(headerSize, data) - data;
resultSize = sizeOfHeaderSize + headerSize;
return true;
}
return false;
}
TStateHeader::EErrorCode CheckProto(const TStateHeader* header, size_t dataSize)
{
auto hasRequiredFields = false;
if (header->type() == TStateHeader::BASE) {
hasRequiredFields = header->has_data_size();
} else if (header->type() == TStateHeader::PATCH) {
hasRequiredFields = header->has_base_hash() &&
header->has_state_hash() &&
header->has_state_size() &&
header->has_data_size();
} else {
hasRequiredFields = header->has_error_code();
}
if (!hasRequiredFields) {
return TStateHeader::MISSING_REQUIRED_FIELD_ERROR;
}
auto payloadSizeOk = header->data_size() <= dataSize - SizeOfHeader(*header);
if (!payloadSizeOk) {
return TStateHeader::WRONG_DATA_SIZE;
}
return TStateHeader::NO_ERROR;
}
TState::TState(NProtoBuf::Arena& arena, const ui8* data, size_t size)
{
if (nullptr == data || 0 == size) {
return;
}
HeaderPtr = ParseHeader(arena, data, size);
if (HeaderPtr->has_error_code() && HeaderPtr->error_code() == TStateHeader::HEADER_PARSE_ERROR) {
return;
}
auto errorCode = CheckProto(HeaderPtr, size);
if (errorCode != TStateHeader::NO_ERROR) {
HeaderPtr->Clear();
HeaderPtr->set_error_code(errorCode);
return;
}
if (HeaderPtr->type() != TStateHeader::NONE_TYPE) {
if (HeaderPtr->data_size()) {
Data = data + SizeOfHeader(*HeaderPtr);
}
}
}
ui32 TState::CalcHash() const
{
if (nullptr != PayloadData() && 0 != PayloadSize()) {
return NXdeltaAggregateColumn::CalcHash(PayloadData(), PayloadSize());
}
return 0;
}
size_t TState::PayloadSize() const
{
return HeaderPtr->data_size();
}
TStateHeader::EErrorCode TState::Error() const
{
return HeaderPtr->has_error_code()
? HeaderPtr->error_code()
: TStateHeader::NO_ERROR;
}
TStateHeader::EType TState::Type() const
{
return HeaderPtr->type();
}
}
|
