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78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
#ifndef DB_VARINT_H
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#define DB_VARINT_H
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#include <DB/Core/Types.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/WriteBuffer.h>
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namespace DB
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{
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/** Записать UInt64 в формате переменной длины (base128) */
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void writeVarUInt(UInt64 x, std::ostream & ostr);
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void writeVarUInt(UInt64 x, WriteBuffer & ostr);
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char * writeVarUInt(UInt64 x, char * ostr);
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/** Прочитать UInt64, записанный в формате переменной длины (base128) */
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void readVarUInt(UInt64 & x, std::istream & istr);
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void readVarUInt(UInt64 & x, ReadBuffer & istr);
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const char * readVarUInt(UInt64 & x, const char * istr, size_t size);
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/** Получить длину UInt64 в формате VarUInt */
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size_t getLengthOfVarUInt(UInt64 x);
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/** Получить длину Int64 в формате VarInt */
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size_t getLengthOfVarInt(Int64 x);
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/** Записать Int64 в формате переменной длины (base128) */
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template <typename OUT>
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inline void writeVarInt(Int64 x, OUT & ostr)
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{
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writeVarUInt(static_cast<UInt64>((x << 1) ^ (x >> 63)), ostr);
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}
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inline char * writeVarInt(Int64 x, char * ostr)
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{
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return writeVarUInt(static_cast<UInt64>((x << 1) ^ (x >> 63)), ostr);
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}
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/** Прочитать Int64, записанный в формате переменной длины (base128) */
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template <typename IN>
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inline void readVarInt(Int64 & x, IN & istr)
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{
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readVarUInt(*reinterpret_cast<UInt64*>(&x), istr);
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x = (static_cast<UInt64>(x) >> 1) ^ -(x & 1);
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}
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inline const char * readVarInt(Int64 & x, const char * istr, size_t size)
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{
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const char * res = readVarUInt(*reinterpret_cast<UInt64*>(&x), istr, size);
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x = (static_cast<UInt64>(x) >> 1) ^ -(x & 1);
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return res;
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}
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inline void writeVarT(UInt64 x, std::ostream & ostr) { writeVarUInt(x, ostr); }
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inline void writeVarT(Int64 x, std::ostream & ostr) { writeVarInt(x, ostr); }
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inline void writeVarT(UInt64 x, WriteBuffer & ostr) { writeVarUInt(x, ostr); }
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inline void writeVarT(Int64 x, WriteBuffer & ostr) { writeVarInt(x, ostr); }
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inline char * writeVarT(UInt64 x, char * & ostr) { return writeVarUInt(x, ostr); }
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inline char * writeVarT(Int64 x, char * & ostr) { return writeVarInt(x, ostr); }
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inline void readVarT(UInt64 & x, std::istream & istr) { readVarUInt(x, istr); }
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inline void readVarT(Int64 & x, std::istream & istr) { readVarInt(x, istr); }
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inline void readVarT(UInt64 & x, ReadBuffer & istr) { readVarUInt(x, istr); }
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inline void readVarT(Int64 & x, ReadBuffer & istr) { readVarInt(x, istr); }
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inline const char * readVarT(UInt64 & x, const char * istr, size_t size) { return readVarUInt(x, istr, size); }
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inline const char * readVarT(Int64 & x, const char * istr, size_t size) { return readVarInt(x, istr, size); }
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}
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#endif
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