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572 lines
15 KiB
C++
572 lines
15 KiB
C++
#pragma once
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#include <cstring>
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#include <limits>
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#include <algorithm>
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#include <tr1/type_traits>
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#include <Yandex/Common.h>
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#include <Yandex/DateLUT.h>
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#include <mysqlxx/Date.h>
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#include <mysqlxx/DateTime.h>
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#include <DB/Core/Types.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/VarInt.h>
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#define DEFAULT_MAX_STRING_SIZE 0x00FFFFFFULL
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namespace DB
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{
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/// Функции-помошники для форматированного чтения
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static inline char parseEscapeSequence(char c)
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{
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switch(c)
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{
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case 'b':
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return '\b';
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case 'f':
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return '\f';
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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case '0':
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return '\0';
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default:
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return c;
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}
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}
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static inline void throwReadAfterEOF()
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{
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throw Exception("Attempt to read after eof", ErrorCodes::ATTEMPT_TO_READ_AFTER_EOF);
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}
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/// Чтение POD-типа в native формате
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template <typename T>
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inline void readPODBinary(T & x, ReadBuffer & buf)
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{
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buf.readStrict(reinterpret_cast<char *>(&x), sizeof(x));
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}
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template <typename T>
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inline void readIntBinary(T & x, ReadBuffer & buf)
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{
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readPODBinary(x, buf);
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}
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template <typename T>
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inline void readFloatBinary(T & x, ReadBuffer & buf)
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{
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readPODBinary(x, buf);
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}
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inline void readStringBinary(std::string & s, DB::ReadBuffer & buf, size_t MAX_STRING_SIZE = DEFAULT_MAX_STRING_SIZE)
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{
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size_t size = 0;
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DB::readVarUInt(size, buf);
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if (size > MAX_STRING_SIZE)
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throw Poco::Exception("Too large string size.");
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s.resize(size);
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buf.readStrict(const_cast<char *>(s.data()), size);
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}
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inline void readChar(char & x, ReadBuffer & buf)
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{
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if (!buf.eof())
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{
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x = *buf.position();
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++buf.position();
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}
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else
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throwReadAfterEOF();
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}
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void assertString(const char * s, ReadBuffer & buf);
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inline void readBoolText(bool & x, ReadBuffer & buf)
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{
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char tmp = '0';
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readChar(tmp, buf);
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x = tmp != '0';
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}
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template <typename T>
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void readIntText(T & x, ReadBuffer & buf)
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{
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bool negative = false;
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x = 0;
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if (buf.eof())
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throwReadAfterEOF();
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while (!buf.eof())
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{
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switch (*buf.position())
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{
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case '+':
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break;
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case '-':
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if (std::tr1::is_signed<T>::value)
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negative = true;
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else
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return;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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x *= 10;
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x += *buf.position() - '0';
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break;
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default:
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if (negative)
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x = -x;
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return;
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}
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++buf.position();
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}
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if (negative)
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x = -x;
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}
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/** Более оптимизированная версия (примерно в 1.5 раза на реальных данных).
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* Отличается тем, что:
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* - из чисел, начинающихся на ноль, парсится только ноль;
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* - не поддерживается символ '+' перед числом;
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* - символы :;<=>? парсятся, как некоторые цифры.
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*/
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template <typename T>
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void readIntTextUnsafe(T & x, ReadBuffer & buf)
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{
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bool negative = false;
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x = 0;
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if (unlikely(buf.eof()))
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throwReadAfterEOF();
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if (std::tr1::is_signed<T>::value && *buf.position() == '-')
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{
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++buf.position();
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negative = true;
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}
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if (*buf.position() == '0') /// В реальных данных много нулей.
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{
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++buf.position();
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return;
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}
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while (!buf.eof())
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{
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if ((*buf.position() & 0xF0) == 0x30) /// Имеет смысл, что это условие находится внутри цикла.
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{
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x *= 10;
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x += *buf.position() & 0x0F;
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++buf.position();
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}
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else
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break;
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}
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if (std::tr1::is_signed<T>::value && negative)
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x = -x;
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}
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/// грубо
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template <typename T>
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void readFloatText(T & x, ReadBuffer & buf)
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{
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bool negative = false;
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x = 0;
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bool after_point = false;
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double power_of_ten = 1;
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if (buf.eof())
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throwReadAfterEOF();
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while (!buf.eof())
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{
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switch (*buf.position())
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{
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case '+':
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break;
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case '-':
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negative = true;
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break;
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case '.':
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after_point = true;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if (after_point)
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{
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power_of_ten /= 10;
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x += (*buf.position() - '0') * power_of_ten;
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}
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else
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{
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x *= 10;
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x += *buf.position() - '0';
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}
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break;
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case 'e':
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case 'E':
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{
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++buf.position();
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Int32 exponent = 0;
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readIntText(exponent, buf);
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if (exponent == 0)
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{
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if (negative)
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x = -x;
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return;
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}
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else if (exponent > 0)
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{
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for (Int32 i = 0; i < exponent; ++i)
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x *= 10;
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if (negative)
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x = -x;
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return;
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}
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else
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{
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for (Int32 i = 0; i < exponent; ++i)
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x /= 10;
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if (negative)
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x = -x;
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return;
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}
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}
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case 'i':
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++buf.position();
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assertString("nf", buf);
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x = std::numeric_limits<T>::infinity();
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if (negative)
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x = -x;
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return;
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case 'I':
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++buf.position();
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assertString("NF", buf);
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x = std::numeric_limits<T>::infinity();
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if (negative)
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x = -x;
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return;
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case 'n':
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++buf.position();
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assertString("an", buf);
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x = std::numeric_limits<T>::quiet_NaN();
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return;
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case 'N':
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++buf.position();
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assertString("AN", buf);
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x = std::numeric_limits<T>::quiet_NaN();
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return;
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default:
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if (negative)
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x = -x;
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return;
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}
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++buf.position();
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}
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if (negative)
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x = -x;
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}
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/// грубо; всё до '\n' или '\t'
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void readString(String & s, ReadBuffer & buf);
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void readEscapedString(String & s, ReadBuffer & buf);
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void readQuotedString(String & s, ReadBuffer & buf);
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void readDoubleQuotedString(String & s, ReadBuffer & buf);
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void readBackQuotedString(String & s, ReadBuffer & buf);
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/// в формате YYYY-MM-DD
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inline void readDateText(Yandex::DayNum_t & date, ReadBuffer & buf)
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{
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char s[10];
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size_t size = buf.read(s, 10);
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if (10 != size)
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{
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s[size] = 0;
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throw Exception(std::string("Cannot parse date ") + s, ErrorCodes::CANNOT_PARSE_DATE);
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}
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UInt16 year = (s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0');
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UInt8 month = (s[5] - '0') * 10 + (s[6] - '0');
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UInt8 day = (s[8] - '0') * 10 + (s[9] - '0');
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date = Yandex::DateLUTSingleton::instance().makeDayNum(year, month, day);
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}
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inline void readDateText(mysqlxx::Date & date, ReadBuffer & buf)
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{
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char s[10];
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size_t size = buf.read(s, 10);
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if (10 != size)
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{
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s[size] = 0;
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throw Exception(std::string("Cannot parse date ") + s, ErrorCodes::CANNOT_PARSE_DATE);
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}
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date.year((s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0'));
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date.month((s[5] - '0') * 10 + (s[6] - '0'));
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date.day((s[8] - '0') * 10 + (s[9] - '0'));
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}
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/// в формате YYYY-MM-DD HH:MM:SS, согласно текущему часовому поясу
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inline void readDateTimeText(time_t & datetime, ReadBuffer & buf)
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{
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char s[19];
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size_t size = buf.read(s, 19);
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if (19 != size)
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{
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s[size] = 0;
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throw Exception(std::string("Cannot parse datetime ") + s, ErrorCodes::CANNOT_PARSE_DATETIME);
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}
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UInt16 year = (s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0');
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UInt8 month = (s[5] - '0') * 10 + (s[6] - '0');
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UInt8 day = (s[8] - '0') * 10 + (s[9] - '0');
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UInt8 hour = (s[11] - '0') * 10 + (s[12] - '0');
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UInt8 minute = (s[14] - '0') * 10 + (s[15] - '0');
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UInt8 second = (s[17] - '0') * 10 + (s[18] - '0');
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if (unlikely(year == 0))
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datetime = 0;
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else
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datetime = Yandex::DateLUTSingleton::instance().makeDateTime(year, month, day, hour, minute, second);
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}
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inline void readDateTimeText(mysqlxx::DateTime & datetime, ReadBuffer & buf)
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{
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char s[19];
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size_t size = buf.read(s, 19);
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if (19 != size)
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{
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s[size] = 0;
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throw Exception(std::string("Cannot parse datetime ") + s, ErrorCodes::CANNOT_PARSE_DATETIME);
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}
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datetime.year((s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0'));
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datetime.month((s[5] - '0') * 10 + (s[6] - '0'));
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datetime.day((s[8] - '0') * 10 + (s[9] - '0'));
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datetime.hour((s[11] - '0') * 10 + (s[12] - '0'));
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datetime.minute((s[14] - '0') * 10 + (s[15] - '0'));
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datetime.second((s[17] - '0') * 10 + (s[18] - '0'));
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}
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/// Общие методы для чтения значения в бинарном формате.
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inline void readBinary(UInt8 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(UInt16 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(UInt32 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(UInt64 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Int8 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Int16 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Int32 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Int64 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Float32 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Float64 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(String & x, ReadBuffer & buf) { readStringBinary(x, buf); }
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inline void readBinary(bool & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(Yandex::VisitID_t & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(mysqlxx::Date & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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inline void readBinary(mysqlxx::DateTime & x, ReadBuffer & buf) { readPODBinary(x, buf); }
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/// Общие методы для чтения значения в текстовом виде из tab-separated формата.
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inline void readText(UInt8 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(UInt16 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(UInt32 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(UInt64 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(Int8 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(Int16 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(Int32 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(Int64 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(Float32 & x, ReadBuffer & buf) { readFloatText(x, buf); }
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inline void readText(Float64 & x, ReadBuffer & buf) { readFloatText(x, buf); }
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inline void readText(String & x, ReadBuffer & buf) { readEscapedString(x, buf); }
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inline void readText(bool & x, ReadBuffer & buf) { readBoolText(x, buf); }
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inline void readText(Yandex::VisitID_t & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readText(mysqlxx::Date & x, ReadBuffer & buf) { readDateText(x, buf); }
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inline void readText(mysqlxx::DateTime & x, ReadBuffer & buf) { readDateTimeText(x, buf); }
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/// Общие методы для чтения значения в текстовом виде, при необходимости, в кавычках.
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inline void readQuoted(UInt8 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(UInt16 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(UInt32 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(UInt64 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(Int8 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(Int16 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(Int32 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(Int64 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(Float32 & x, ReadBuffer & buf) { readFloatText(x, buf); }
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inline void readQuoted(Float64 & x, ReadBuffer & buf) { readFloatText(x, buf); }
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inline void readQuoted(String & x, ReadBuffer & buf) { readQuotedString(x, buf); }
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inline void readQuoted(bool & x, ReadBuffer & buf) { readBoolText(x, buf); }
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inline void readQuoted(Yandex::VisitID_t & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readQuoted(mysqlxx::Date & x, ReadBuffer & buf)
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{
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assertString("'", buf);
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readDateText(x, buf);
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assertString("'", buf);
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}
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inline void readQuoted(mysqlxx::DateTime & x, ReadBuffer & buf)
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{
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assertString("'", buf);
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readDateTimeText(x, buf);
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assertString("'", buf);
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}
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/// В двойных кавычках
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inline void readDoubleQuoted(UInt8 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(UInt16 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(UInt32 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(UInt64 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(Int8 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(Int16 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(Int32 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(Int64 & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(Float32 & x, ReadBuffer & buf) { readFloatText(x, buf); }
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inline void readDoubleQuoted(Float64 & x, ReadBuffer & buf) { readFloatText(x, buf); }
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inline void readDoubleQuoted(String & x, ReadBuffer & buf) { readDoubleQuotedString(x, buf); }
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inline void readDoubleQuoted(bool & x, ReadBuffer & buf) { readBoolText(x, buf); }
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inline void readDoubleQuoted(Yandex::VisitID_t & x, ReadBuffer & buf) { readIntText(x, buf); }
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inline void readDoubleQuoted(mysqlxx::Date & x, ReadBuffer & buf)
|
||
{
|
||
assertString("\"", buf);
|
||
readDateText(x, buf);
|
||
assertString("\"", buf);
|
||
}
|
||
|
||
inline void readDoubleQuoted(mysqlxx::DateTime & x, ReadBuffer & buf)
|
||
{
|
||
assertString("\"", buf);
|
||
readDateTimeText(x, buf);
|
||
assertString("\"", buf);
|
||
}
|
||
|
||
|
||
/// Пропустить пробельные символы.
|
||
inline void skipWhitespaceIfAny(ReadBuffer & buf)
|
||
{
|
||
while (!buf.eof()
|
||
&& (*buf.position() == ' '
|
||
|| *buf.position() == '\t'
|
||
|| *buf.position() == '\n'
|
||
|| *buf.position() == '\r'
|
||
|| *buf.position() == '\f'))
|
||
++buf.position();
|
||
}
|
||
|
||
|
||
/** Прочитать сериализованный эксепшен.
|
||
* При сериализации/десериализации часть информации теряется
|
||
* (тип обрезается до базового, message заменяется на displayText, и stack trace дописывается в message)
|
||
* К нему может быть добавлено дополнительное сообщение (например, вы можете указать, откуда оно было прочитано).
|
||
*/
|
||
void readException(Exception & e, ReadBuffer & buf, const String & additional_message = "");
|
||
void readAndThrowException(ReadBuffer & buf, const String & additional_message = "");
|
||
|
||
|
||
/** Вспомогательная функция
|
||
*/
|
||
template <typename T>
|
||
static inline const char * tryReadIntText(T & x, const char * pos, const char * end)
|
||
{
|
||
bool negative = false;
|
||
x = 0;
|
||
if (pos >= end)
|
||
return pos;
|
||
|
||
while (pos < end)
|
||
{
|
||
switch (*pos)
|
||
{
|
||
case '+':
|
||
break;
|
||
case '-':
|
||
if (std::tr1::is_signed<T>::value)
|
||
negative = true;
|
||
else
|
||
return pos;
|
||
break;
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
x *= 10;
|
||
x += *pos - '0';
|
||
break;
|
||
default:
|
||
if (negative)
|
||
x = -x;
|
||
return pos;
|
||
}
|
||
++pos;
|
||
}
|
||
if (negative)
|
||
x = -x;
|
||
return pos;
|
||
}
|
||
|
||
}
|