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#pragma once
#include <util/generic/string.h>
#include <util/generic/yexception.h>
#include <util/system/yassert.h>
inline static char DigitToChar(unsigned char digit) {
if (digit < 10) {
return (char)digit + '0';
}
return (char)(digit - 10) + 'A';
}
extern const char* const Char2DigitTable;
inline static int Char2Digit(char ch) {
char result = Char2DigitTable[(unsigned char)ch];
Y_ENSURE(result != '\xff', "invalid hex character " << (int)ch);
return result;
}
//! Convert a hex string of exactly 2 chars to int
/*! @example String2Byte("10") => 16 */
inline static int String2Byte(const char* s) {
return Char2Digit(*s) * 16 + Char2Digit(*(s + 1));
}
char* HexEncode(const void* in, size_t len, char* out);
TString HexEncode(const void* in, size_t len);
inline TString HexEncode(const TStringBuf h) {
return HexEncode(h.data(), h.size());
}
//! Convert a hex string @c in of @c len chars (case-insensitive) to array of ints stored at @c ptr and return this array.
/*! @note len must be even (len % 2 == 0), otherwise an exception will be thrown.
* @return @c ptr, which is an array of chars, where each char holds the numeric value
* equal to the corresponding 2 digits of the input stream.
* @warning You must ensure that @c ptr has (len/2) allocated bytes, otherwise SIGSEGV will happen.
*
* @example HexDecode("beef", 4, ptr) => {190, 239}
*/
void* HexDecode(const void* in, size_t len, void* ptr);
//! Convert a hex string @c in of @c len chars (case-insensitive) to array of ints and return this array.
/*! @note len must be even (len % 2 == 0), otherwise an exception will be thrown.
* @return an array of chars, where each char holds the numeric value equal to the corresponding 2 digits
* of the input stream.
*
* @example HexDecode("beef", 4) => {190, 239}
*/
TString HexDecode(const void* in, size_t len);
//! Convert an ASCII hex-string (case-insensitive) to the binary form. Note that h.Size() must be even (+h % 2 == 0).
inline TString HexDecode(const TStringBuf h) {
return HexDecode(h.data(), h.size());
}
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