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
159
160
161
162
163
|
#include <zlib.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionStringOrArrayToT.h>
namespace
{
template <class T>
struct CRCBase
{
T tab[256];
explicit CRCBase(T polynomial)
{
for (size_t i = 0; i < 256; ++i)
{
T c = static_cast<T>(i);
for (size_t j = 0; j < 8; ++j)
c = c & 1 ? polynomial ^ (c >> 1) : c >> 1;
tab[i] = c;
}
}
};
template <class T, T polynomial>
struct CRCImpl
{
using ReturnType = T;
static T makeCRC(const unsigned char *buf, size_t size)
{
static CRCBase<ReturnType> base(polynomial);
T crc = 0;
for (size_t i = 0; i < size; ++i)
crc = base.tab[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);
return crc;
}
};
constexpr UInt64 CRC64_ECMA = 0xc96c5795d7870f42ULL;
struct CRC64ECMAImpl : public CRCImpl<UInt64, CRC64_ECMA>
{
static constexpr auto name = "CRC64";
};
constexpr UInt32 CRC32_IEEE = 0xedb88320;
struct CRC32IEEEImpl : public CRCImpl<UInt32, CRC32_IEEE>
{
static constexpr auto name = "CRC32IEEE";
};
struct CRC32ZLIBImpl
{
using ReturnType = UInt32;
static constexpr auto name = "CRC32";
static UInt32 makeCRC(const unsigned char *buf, size_t size)
{
return static_cast<UInt32>(crc32_z(0L, buf, size));
}
};
}
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
namespace
{
template <class Impl>
struct CRCFunctionWrapper
{
static constexpr auto is_fixed_to_constant = true;
using ReturnType = typename Impl::ReturnType;
static void vector(const ColumnString::Chars & data, const ColumnString::Offsets & offsets, PaddedPODArray<ReturnType> & res)
{
size_t size = offsets.size();
ColumnString::Offset prev_offset = 0;
for (size_t i = 0; i < size; ++i)
{
res[i] = doCRC(data, prev_offset, offsets[i] - prev_offset - 1);
prev_offset = offsets[i];
}
}
static void vectorFixedToConstant(const ColumnString::Chars & data, size_t n, ReturnType & res) { res = doCRC(data, 0, n); }
static void vectorFixedToVector(const ColumnString::Chars & data, size_t n, PaddedPODArray<ReturnType> & res)
{
size_t size = data.size() / n;
for (size_t i = 0; i < size; ++i)
{
res[i] = doCRC(data, i * n, n);
}
}
[[noreturn]] static void array(const ColumnString::Offsets & /*offsets*/, PaddedPODArray<ReturnType> & /*res*/)
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Cannot apply function {} to Array argument", std::string(Impl::name));
}
[[noreturn]] static void uuid(const ColumnUUID::Container & /*offsets*/, size_t /*n*/, PaddedPODArray<ReturnType> & /*res*/)
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Cannot apply function {} to UUID argument", std::string(Impl::name));
}
[[noreturn]] static void ipv6(const ColumnIPv6::Container & /*offsets*/, size_t /*n*/, PaddedPODArray<ReturnType> & /*res*/)
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Cannot apply function {} to IPv6 argument", std::string(Impl::name));
}
[[noreturn]] static void ipv4(const ColumnIPv4::Container & /*offsets*/, size_t /*n*/, PaddedPODArray<ReturnType> & /*res*/)
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Cannot apply function {} to IPv4 argument", std::string(Impl::name));
}
private:
static ReturnType doCRC(const ColumnString::Chars & buf, size_t offset, size_t size)
{
const unsigned char * p = reinterpret_cast<const unsigned char *>(buf.data()) + offset;
return Impl::makeCRC(p, size);
}
};
template <class T>
using FunctionCRC = FunctionStringOrArrayToT<CRCFunctionWrapper<T>, T, typename T::ReturnType>;
// The same as IEEE variant, but uses 0xffffffff as initial value
// This is the default
//
// (And zlib is used here, since it has optimized version)
using FunctionCRC32ZLIB = FunctionCRC<CRC32ZLIBImpl>;
// Uses CRC-32-IEEE 802.3 polynomial
using FunctionCRC32IEEE = FunctionCRC<CRC32IEEEImpl>;
// Uses CRC-64-ECMA polynomial
using FunctionCRC64ECMA = FunctionCRC<CRC64ECMAImpl>;
}
template <class T>
void registerFunctionCRCImpl(FunctionFactory & factory)
{
factory.registerFunction<T>(T::name, {}, FunctionFactory::CaseInsensitive);
}
REGISTER_FUNCTION(CRC)
{
registerFunctionCRCImpl<FunctionCRC32ZLIB>(factory);
registerFunctionCRCImpl<FunctionCRC32IEEE>(factory);
registerFunctionCRCImpl<FunctionCRC64ECMA>(factory);
}
}
|
