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https://github.com/ClickHouse/ClickHouse.git
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142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
#pragma once
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#include <string>
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/// Maps 0..15 to 0..9A..F or 0..9a..f correspondingly.
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extern const char * const hex_digit_to_char_uppercase_table;
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extern const char * const hex_digit_to_char_lowercase_table;
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inline char hexDigitUppercase(unsigned char c)
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{
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return hex_digit_to_char_uppercase_table[c];
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}
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inline char hexDigitLowercase(unsigned char c)
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{
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return hex_digit_to_char_lowercase_table[c];
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}
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#include <cstring>
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#include <cstddef>
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#include <base/types.h>
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/// Maps 0..255 to 00..FF or 00..ff correspondingly
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extern const char * const hex_byte_to_char_uppercase_table;
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extern const char * const hex_byte_to_char_lowercase_table;
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inline void writeHexByteUppercase(UInt8 byte, void * out)
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{
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memcpy(out, &hex_byte_to_char_uppercase_table[static_cast<size_t>(byte) * 2], 2);
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}
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inline void writeHexByteLowercase(UInt8 byte, void * out)
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{
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memcpy(out, &hex_byte_to_char_lowercase_table[static_cast<size_t>(byte) * 2], 2);
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}
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extern const char * const bin_byte_to_char_table;
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inline void writeBinByte(UInt8 byte, void * out)
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{
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memcpy(out, &bin_byte_to_char_table[static_cast<size_t>(byte) * 8], 8);
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}
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/// Produces hex representation of an unsigned int with leading zeros (for checksums)
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template <typename TUInt>
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inline void writeHexUIntImpl(TUInt uint_, char * out, const char * const table)
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{
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union
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{
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TUInt value;
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UInt8 uint8[sizeof(TUInt)];
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};
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value = uint_;
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/// Use little endian
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for (size_t i = 0; i < sizeof(TUInt); ++i)
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memcpy(out + i * 2, &table[static_cast<size_t>(uint8[sizeof(TUInt) - 1 - i]) * 2], 2);
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}
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template <typename TUInt>
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inline void writeHexUIntUppercase(TUInt uint_, char * out)
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{
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writeHexUIntImpl(uint_, out, hex_byte_to_char_uppercase_table);
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}
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template <typename TUInt>
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inline void writeHexUIntLowercase(TUInt uint_, char * out)
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{
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writeHexUIntImpl(uint_, out, hex_byte_to_char_lowercase_table);
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}
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template <typename TUInt>
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std::string getHexUIntUppercase(TUInt uint_)
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{
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std::string res(sizeof(TUInt) * 2, '\0');
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writeHexUIntUppercase(uint_, res.data());
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return res;
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}
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template <typename TUInt>
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std::string getHexUIntLowercase(TUInt uint_)
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{
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std::string res(sizeof(TUInt) * 2, '\0');
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writeHexUIntLowercase(uint_, res.data());
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return res;
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}
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/// Maps 0..9, A..F, a..f to 0..15. Other chars are mapped to implementation specific value.
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extern const char * const hex_char_to_digit_table;
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inline UInt8 unhex(char c)
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{
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return hex_char_to_digit_table[static_cast<UInt8>(c)];
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}
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inline UInt8 unhex2(const char * data)
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{
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return
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static_cast<UInt8>(unhex(data[0])) * 0x10
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+ static_cast<UInt8>(unhex(data[1]));
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}
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inline UInt16 unhex4(const char * data)
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{
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return
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static_cast<UInt16>(unhex(data[0])) * 0x1000
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+ static_cast<UInt16>(unhex(data[1])) * 0x100
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+ static_cast<UInt16>(unhex(data[2])) * 0x10
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+ static_cast<UInt16>(unhex(data[3]));
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}
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template <typename TUInt>
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TUInt unhexUInt(const char * data)
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{
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TUInt res = 0;
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if constexpr ((sizeof(TUInt) <= 8) || ((sizeof(TUInt) % 8) != 0))
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{
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for (size_t i = 0; i < sizeof(TUInt) * 2; ++i, ++data)
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{
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res <<= 4;
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res += unhex(*data);
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}
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}
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else
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{
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for (size_t i = 0; i < sizeof(TUInt) / 8; ++i, data += 16)
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{
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res <<= 64;
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res += unhexUInt<UInt64>(data);
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}
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}
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return res;
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}
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