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106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
#include <openssl/md5.h>
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#include <DB/Core/Field.h>
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namespace DB
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{
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class FieldVisitorHash : public boost::static_visitor<>
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{
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public:
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MD5_CTX state;
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FieldVisitorHash()
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{
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MD5_Init(&state);
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}
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void finalize(unsigned char * place)
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{
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MD5_Final(place, &state);
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}
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void operator() (const Null & x)
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{
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char type = FieldType::Null;
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MD5_Update(&state, reinterpret_cast<const char *>(&type), sizeof(type));
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}
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void operator() (const UInt64 & x)
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{
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char type = FieldType::UInt64;
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MD5_Update(&state, reinterpret_cast<const char *>(&type), sizeof(type));
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MD5_Update(&state, reinterpret_cast<const char *>(&x), sizeof(x));
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}
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void operator() (const Int64 & x)
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{
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char type = FieldType::Int64;
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MD5_Update(&state, reinterpret_cast<const char *>(&type), sizeof(type));
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MD5_Update(&state, reinterpret_cast<const char *>(&x), sizeof(x));
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}
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void operator() (const Float64 & x)
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{
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char type = FieldType::Float64;
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MD5_Update(&state, reinterpret_cast<const char *>(&type), sizeof(type));
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MD5_Update(&state, reinterpret_cast<const char *>(&x), sizeof(x));
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}
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void operator() (const String & x)
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{
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char type = FieldType::String;
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MD5_Update(&state, reinterpret_cast<const char *>(&type), sizeof(type));
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/// Используем ноль на конце.
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MD5_Update(&state, x.c_str(), x.size() + 1);
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}
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void operator() (const Array & x)
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{
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throw Exception("Cannot aggregate by array", ErrorCodes::ILLEGAL_KEY_OF_AGGREGATION);
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}
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void operator() (const SharedPtr<IAggregateFunction> & x)
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{
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throw Exception("Cannot aggregate by state of aggregate function", ErrorCodes::ILLEGAL_KEY_OF_AGGREGATION);
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}
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};
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/** Преобразование значения в 64 бита. Для чисел - однозначное, для строк - некриптографический хэш. */
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class FieldVisitorToUInt64 : public boost::static_visitor<UInt64>
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{
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public:
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FieldVisitorToUInt64() {}
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UInt64 operator() (const Null & x) const { return 0; }
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UInt64 operator() (const UInt64 & x) const { return x; }
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UInt64 operator() (const Int64 & x) const { return x; }
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UInt64 operator() (const Float64 & x) const
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{
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UInt64 res = 0;
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memcpy(reinterpret_cast<char *>(&res), reinterpret_cast<const char *>(&x), sizeof(x));
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return res;
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}
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UInt64 operator() (const String & x) const
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{
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return std::tr1::hash<String>()(x);
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}
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UInt64 operator() (const Array & x) const
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{
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throw Exception("Cannot aggregate by array", ErrorCodes::ILLEGAL_KEY_OF_AGGREGATION);
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}
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UInt64 operator() (const SharedPtr<IAggregateFunction> & x) const
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{
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throw Exception("Cannot aggregate by state of aggregate function", ErrorCodes::ILLEGAL_KEY_OF_AGGREGATION);
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}
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};
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}
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