二进制值和十六进制字符串相互转换的C++代码

#include <iostream>
#include <string>
#include <stdint.h>

using namespace std;

string BinToHex(const string &strBin, bool bIsUpper = false)
{
string strHex;
strHex.resize(strBin.size() * 2);
for (size_t i = 0; i < strBin.size(); i++)
{
uint8_t cTemp = strBin[i];
for (size_t j = 0; j < 2; j++)
{
uint8_t cCur = (cTemp & 0x0f);
if (cCur < 10)
{
cCur += '0';
}
else
{
cCur += ((bIsUpper ? 'A' : 'a') - 10);
}
strHex[2 * i + 1 - j] = cCur;
cTemp >>= 4;
}
}

return strHex;
}

string HexToBin(const string &strHex)
{
if (strHex.size() % 2 != 0)
{
return "";
}

string strBin;
strBin.resize(strHex.size() / 2);
for (size_t i = 0; i < strBin.size(); i++)
{
uint8_t cTemp = 0;
for (size_t j = 0; j < 2; j++)
{
char cCur = strHex[2 * i + j];
if (cCur >= '0' && cCur <= '9')
{
cTemp = (cTemp << 4) + (cCur - '0');
}
else if (cCur >= 'a' && cCur <= 'f')
{
cTemp = (cTemp << 4) + (cCur - 'a' + 10);
}
else if (cCur >= 'A' && cCur <= 'F')
{
cTemp = (cTemp << 4) + (cCur - 'A' + 10);
}
else
{
return "";
}
}
strBin[i] = cTemp;
}

return strBin;
}

int main()
{
string strBin = "!@#$%^&*()_+~`1234567890-=";
string strHex = "21402324255E262A28295F2B7E60313233343536373839302D3D";

string strBinToHex = BinToHex(strBin);
cout << strBinToHex << endl;
strBinToHex = BinToHex(strBin, true);
cout << strBinToHex << endl;

string strHexToBin = HexToBin(strHex);
cout << strHexToBin << endl;

return 0;
}