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
|
// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <cmath>
#include <cstdint>
#include <cstddef>
namespace document {
struct CompressionConfig {
enum Type {
NONE = 0,
HISTORIC_1 = 1,
HISTORIC_2 = 2,
HISTORIC_3 = 3,
HISTORIC_4 = 4,
UNCOMPRESSABLE = 5,
LZ4 = 6
};
CompressionConfig()
: type(NONE), compressionLevel(0), threshold(90), minSize(0) {}
CompressionConfig(Type t)
: type(t), compressionLevel(9), threshold(90), minSize(0) {}
CompressionConfig(Type t, uint8_t level, uint8_t minRes)
: type(t), compressionLevel(level), threshold(minRes), minSize(0) {}
CompressionConfig(Type t, uint8_t lvl, uint8_t minRes, size_t minSz)
: type(t), compressionLevel(lvl), threshold(minRes), minSize(minSz) {}
bool operator==(const CompressionConfig& o) const {
return (type == o.type
&& compressionLevel == o.compressionLevel
&& threshold == o.threshold);
}
bool operator!=(const CompressionConfig& o) const {
return !operator==(o);
}
static Type toType(uint32_t val) {
switch (val) {
case 1: return HISTORIC_1;
case 2: return HISTORIC_2;
case 3: return HISTORIC_3;
case 4: return HISTORIC_4;
case 5: return UNCOMPRESSABLE;
case 6: return LZ4;
default: return NONE;
}
}
static bool isCompressed(Type type) {
return (type != CompressionConfig::NONE &&
type != CompressionConfig::UNCOMPRESSABLE);
}
bool useCompression() const { return isCompressed(type); }
Type type;
uint8_t compressionLevel;
uint8_t threshold;
size_t minSize;
};
class CompressionInfo
{
public:
CompressionInfo(size_t uncompressedSize)
: _uncompressedSize(uncompressedSize), _compressedSize(uncompressedSize) { }
CompressionInfo(size_t uncompressedSize, size_t compressedSize)
: _uncompressedSize(uncompressedSize), _compressedSize(compressedSize) { }
size_t getUncompressedSize() const { return _uncompressedSize; }
size_t getCompressedSize() const { return _compressedSize; }
double getCompressionRatio() const { return _uncompressedSize/_compressedSize; }
private:
size_t _uncompressedSize;
size_t _compressedSize;
};
inline CompressionInfo operator + (const CompressionInfo & a, const CompressionInfo & b)
{
return CompressionInfo(a.getUncompressedSize() + b.getUncompressedSize(), a.getCompressedSize() + b.getCompressedSize());
}
}
|
