libpcsc_cpptools/src/DBO/ScHex.cpp

//
// Created by robin on 6/29/15.
//

#include <string>
#include <wintypes.h>
#include "libpcsc_cpptools/ScHex.h"


const char ScHex::hexCharToInt(const char& c)
{
    if (c >= 'a')
        return (char)(10 + (c - ('a' - 'A')) - 'A');
    if (c >= 'A')
        return (char)(10 + c - 'A');
    return c - '0';
}

const std::string ScHex::stringToByteArray(const std::string &str)
{
    std::string hexa;
    for (auto c : str)
    {
        if (isxdigit(c))
            hexa += c;
    }
    if (hexa.size() % 2)
        hexa.insert(0, "0");
    auto data = new BYTE[hexa.size() / 2];
    for (size_t i = 0; i < hexa.size(); i += 2)
    {
        data[i / 2] = (hexCharToInt(hexa[i]) << 4) | hexCharToInt(hexa[i + 1]);
    }
    return std::string((char*)data, hexa.size() / 2);
}

const std::string ScHex::byteArrayToString(const std::string &bytes, const std::string &separator)
{
    std::string res;
    for (DWORD i = 0; i < bytes.size();++i)
    {
        res += intToHexChar(bytes.data()[i]);
        if (i != bytes.size() - 1)
            res += separator;
    }
    return res;
}

const std::string ScHex::intToHexChar(const char &c)
{
    std::string res;
    for (auto c1 : {(c & 0xf0) >> 4, c & 0x0f})
    {
        if (c1 < 10)
            res += '0' + c1;
        else
            res += 'A' + (c1 - 10);
    }
    return res;
}