C++实现urlencode,urldecode

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namespace HttpUtility{       typedef unsigned char BYTE;     inline BYTE toHex(const BYTE &x)    {        return x > 9 ? x -10 + 'A': x + '0';    }    inline BYTE fromHex(const BYTE &x)    {        return isdigit(x) ? x-'0' : x-'A'+10;    }     inline string URLEncode(const string &sIn)    {        string sOut;        for( size_t ix = 0; ix < sIn.size(); ix++ )        {                  BYTE buf[4];            memset( buf, 0, 4 );            if( isalnum( (BYTE)sIn[ix] ) )            {                      buf[0] = sIn[ix];            }            //else if ( isspace( (BYTE)sIn[ix] ) ) //貌似把空格编码成%20或者+都可以            //{            //    buf[0] = '+';            //}            else            {                buf[0] = '%';                buf[1] = toHex( (BYTE)sIn[ix] >> 4 );                buf[2] = toHex( (BYTE)sIn[ix] % 16);            }            sOut += (char *)buf;        }        return sOut;    };    inline string URLDecode(const string &sIn)    {        string sOut;        for( size_t ix = 0; ix < sIn.size(); ix++ )        {            BYTE ch = 0;            if(sIn[ix]=='%')            {                ch = (fromHex(sIn[ix+1])<<4);                ch |= fromHex(sIn[ix+2]);                ix += 2;            }            else if(sIn[ix] == '+')            {                ch = ' ';            }            else            {                ch = sIn[ix];            }            sOut += (char)ch;        }        return sOut;    }}

感谢：http://www.cnitblog.com/luckydmz/archive/2010/10/12/69959.html