HexHelpers.h

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#pragma once
#include <bzscore/string.h>

namespace GDBServerFoundation
{
    namespace HexHelpers
    {
        const char hexTable[17] = "0123456789abcdef";

        static inline unsigned hexToInt(char hexChar)
        {
            //TODO: convert to a table-based version
            if (hexChar >= '0' && hexChar <= '9')
                return hexChar - '0';
            if (hexChar >= 'A' && hexChar <= 'F')
                return hexChar + 0x0A - 'A';
            if (hexChar >= 'a' && hexChar <= 'f')
                return hexChar + 0x0A - 'a';
            return 0;
        }

        static inline unsigned ParseHexValue(const char *p)
        {
            return (hexToInt(p[0]) << 4) | hexToInt(p[1]);
        }

        static inline unsigned ParseHexValue(char firstChar, char secondChar)
        {
            return (hexToInt(firstChar) << 4) | hexToInt(secondChar);
        }

        template<typename _Type> static inline _Type ParseHexString(const BazisLib::TempStringA &str)
        {
            _Type result = 0;
            size_t i = 0;
            bool negate = false;
            if (!str.empty() && str[0] == '-')
                negate = true, i++;

            for (;i < str.size(); i++)
                result = (result << 4) | hexToInt(str[i]);      

            if (negate)
                return 0 - result;
            return result;
        }
    }
}