Summary and realization of UrlEncode and UrlDecode

UrlEncode:
Used to encode URL strings, numbers and letters remain unchanged, spaces become ' + ', others (such as: Chinese characters) are first converted to hexadecimal notation, and then an identifier% is prepended to each byte.
For example: "Ah" ASCII hexadecimal is 0xb0a1-->%b0%a1

Code implementation:

1UnsignedCharChar_to_hex (unsignedCharch)2 {3     //0xa (10) converted to character ' A ' (65), plus//0x0 (0) translates to character ' 0 ' (48), plus4     return(unsignedChar) (Ch >9? CH + -: Ch + -);5 }6 7STD::stringUrlEncode (Const Char*PSRC)8 {9UnsignedCharchtemp;TenSTD::stringstrdest; One  A      while(*PSRC) -     { -Chtemp = (unsignedChar)*PSRC; the         if((Chtemp >='a'&& chtemp <='Z') || (Chtemp >='A'&& chtemp <='Z') || (Chtemp >='0'&& chtemp <='9') -|| STRCHR ("-_.! ~* ' ()", chtemp)) -         { -Strdest + =chtemp; +         } -          Else if(Chtemp = =' ') +          { A*pdest++ ='+'; at          } -         Else -         { -Strdest + ='%'; -Strdest + = Char_to_hex (unsignedChar) (Chtemp >>4) ); -Strdest + = Char_to_hex (unsignedChar) (Chtemp &0x0f) ); in         } -++PSRC; to     } +  -     returnstrdest; the}

UrlDecode:
Used to decode encoded URL strings, which are decoded in the opposite way as UrlEncode

Code implementation:

1UnsignedChar* UrlDecode (unsignedChar* PSRC, std::string&strdest)2 {3     Charsztemp[2];4 5      while(*PSRC)6     {7memset (Sztemp,'/0',2 );8         if(*psrc! ='%'&& *PSRC! =' ')9         {TenStrdest + = *psrc++; One             Continue; A         } -         Else if(*PSRC = =' ' ) -         { theStrdest + ='+'; -             Continue; -         } -         //Ignore% +++PSRC; -UnsignedCharCTMP =0; +  A          for(intK =0; K <2&& *psrc; ++k, ++PSRC)//example: Will%3f---> 0x3f at         { -             if(*psrc <='9')//0x30~0x39 -             { -CTMP |= (*PSRC &0x0f) << (1-K) *4; -             } -             Else if(*psrc >='a')//0x61~7a in             { -CTMP |= (*PSRC-0x57) << (1-K) *4; to             } +             Else//0x41~5a -             { theCTMP |= (*PSRC-0x37) << (1-K) *4; *             } $         }Panax NotoginsengStrdest + =cTmp; -     } the     return 0; +}

Summary and realization of UrlEncode and UrlDecode