int　urldecode(char *str)

{

        int i, j;

        int len;

        if(!str) return 0;



        if(!strchr(str, '%')) return 0;



        len = strlen(str);

        for(i=0; i<len; i++){

                if(str[i] == '%'){

                        if(i+2 >= len){

                                return 1;

                        }

                        if(str[i+1] == '2' && str[i+2] == '5'){

                                str[i] = '%';

                                len -= 2;

                                for(j=i+1; j<len; j++){

                                        str[j] = str[j+2];

                                }

                                str[j] = '\0';

                        }else if(str[i+1] == '3' && (str[i+2] == 'A' || str[i+2] == 'a')){

                                str[i] = ':';

                                len -= 2;

                                for(j=i+1; j<len; j++){

                                        str[j] = str[j+2];

                                }

                                str[j] = '\0';

                        }else if(str[i+1] == '4' && str[i+2] == '0'){

                                str[i] = ':';

                                len -= 2;

                                for(j=i+1; j<len; j++){

                                        str[j] = str[j+2];

                                }

                                str[j] = '\0';

                        }else{

                                return 1;

                        }

                }

        }

        return 0;

}