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
|
/*
* Copyright (c) 2019, 2025, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2.0,
* as published by the Free Software Foundation.
*
* This program is designed to work with certain software (including
* but not limited to OpenSSL) that is licensed under separate terms,
* as designated in a particular file or component or in included license
* documentation. The authors of MySQL hereby grant you an additional
* permission to link the program and your derivative works with the
* separately licensed software that they have either included with
* the program or referenced in the documentation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License, version 2.0, for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PLUGIN_X_PROTOCOL_STREAM_DECOMPRESSION_INPUT_STREAM_H_
#define PLUGIN_X_PROTOCOL_STREAM_DECOMPRESSION_INPUT_STREAM_H_
#include "google/protobuf/io/zero_copy_stream.h"
#include "my_dbug.h"
#include "plugin/x/protocol/stream/compression/decompression_algorithm_interface.h"
namespace protocol {
class Decompression_input_stream
: public google::protobuf::io::ZeroCopyInputStream {
public:
using ZeroCopyInputStream = google::protobuf::io::ZeroCopyInputStream;
public:
Decompression_input_stream(Decompression_algorithm_interface *algorithm,
ZeroCopyInputStream *zero_copy_stream)
: m_decompression_algorithm(algorithm), m_source(zero_copy_stream) {}
bool Next(const void **data, int *size) override {
DBUG_TRACE;
const auto left = m_output_buffer_data_size - m_output_buffer_offset;
if (left > 0) {
*data = m_output_buffer + m_output_buffer_offset;
*size = left;
m_output_buffer_offset = m_output_buffer_data_size;
DBUG_PRINT("info", ("Next(size:%i)=true", *size));
DBUG_DUMP("Decompression_input_stream-out", (const uint8_t *)*data,
(int)*size);
return true;
}
m_all += m_output_buffer_offset;
if (!ReadCompressed()) {
return false;
}
return Next(data, size);
}
void BackUp(int count) override {
m_output_buffer_offset -= count;
DBUG_LOG("Decompression_input_stream::debug",
"BackUp(" << count << ") where m_output_buffer_offset:"
<< m_output_buffer_offset
<< ", m_output_buffer_data_size:"
<< m_output_buffer_data_size);
}
bool Skip(int count) override {
DBUG_LOG("Decompression_input_stream::debug", "Skip(" << count << ")");
auto left = m_output_buffer_data_size - m_output_buffer_offset;
if (left >= count) {
m_output_buffer_offset += count;
return true;
}
m_output_buffer_offset = m_output_buffer_data_size;
m_all += m_output_buffer_offset;
if (!ReadCompressed()) return false;
return Skip(count - left);
}
google::protobuf::int64 ByteCount() const override {
return m_all + m_output_buffer_offset;
}
private:
bool ReadCompressed() {
DBUG_TRACE;
if (m_decompression_algorithm->needs_input()) {
uint8_t *in_ptr;
int in_size;
if (!m_source->Next(
const_cast<const void **>(reinterpret_cast<void **>(&in_ptr)),
&in_size))
return false;
m_decompression_algorithm->set_input(in_ptr, in_size);
}
m_output_buffer_offset = 0;
m_output_buffer_data_size = sizeof(m_output_buffer);
return m_decompression_algorithm->decompress(m_output_buffer,
&m_output_buffer_data_size);
}
Decompression_algorithm_interface *m_decompression_algorithm;
ZeroCopyInputStream *m_source;
int64_t m_all = 0;
int64_t m_output_buffer_data_size = 0;
int64_t m_output_buffer_offset = 0;
uint8_t m_output_buffer[512];
};
} // namespace protocol
#endif // PLUGIN_X_PROTOCOL_STREAM_DECOMPRESSION_INPUT_STREAM_H_
|
