char dec2hexChar(short int n) {
if ( 0 <= n &&n <= 9 ) {
return char( short('0') + n );
} else if ( 10 <= n&& n <= 15 ){
return char( short('A') + n - 10 );
} else {
return char(0);
}
}
short int hexChar2dec(char c) {
if ( '0'<=c &&c<='9' ) {
return short(c-'0');
} else if ( 'a'<=c&& c<='f' ){
return ( short(c-'a') + 10 );
} else if ( 'A'<=c&& c<='F' ){
return ( short(c-'A') + 10 );
} else {
return -1;
}
}
string escapeURL(const string &URL)
{
string result = "";
for ( unsigned int i=0; i<URL.size(); i++ ){
char c = URL[i];
if (
( '0'<=c&& c<='9' ) ||
( 'a'<=c&& c<='z' ) ||
( 'A'<=c&& c<='Z' ) ||
c=='/' || c=='.'
) {
result += c;
} else {
int j = (short int)c;
if ( j < 0 ){
j += 256;
}
int i1, i0;
i1 = j / 16;
i0 = j - i1*16;
result += '%';
result += dec2hexChar(i1);
result += dec2hexChar(i0);
}
}
return result;
}
std::string deescapeURL(conststd::string &URL){
string result = "";
for ( unsigned int i=0; i<URL.size(); i++ ){
char c = URL[i];
if ( c != '%' ) {
result += c;
} else {
char c1 = URL[++i];
char c0 = URL[++i];
int num = 0;
num += hexChar2dec(c1) * 16 +hexChar2dec(c0);
result += char(num);
}
}
return result;
}
} else {
char c1 = URL[++i];
char c0 = URL[++i];
int num = 0;
num += hexChar2dec(c1) * 16 +hexChar2dec(c0);