URL编解码

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(const std::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; }