C ++ implements UrlEncode and UrlDecode

# Include "stdafx. h"

# Include

# Include

# Include

Using namespace std;

Std: string UrlEncode (const std: string & szToEncode)

{

Std: string src = szToEncode;

Char hex [] = "0123456789 ABCDEF ";

String dst;

For (size_t I = 0; I <src. size (); ++ I)

{

Unsigned char cc = src [I];

If (isascii (cc ))

{

If (cc = '')

{

Dst + = "% 20 ";

}

Else

Dst + = cc;

}

Else

{

Unsigned char c = static_cast (src [I]);

Dst + = '% ';

Dst + = hex [c/16];

Dst + = hex [c % 16];

}

}

Return dst;

}

Std: string UrlDecode (const std: string & szToDecode)

{

Std: string result;

Int hex = 0;

For (size_t I = 0; I <szToDecode. length (); ++ I)

{

Switch (szToDecode [I])

{

Case '+ ':

Result + = '';

Break;

Case '% ':

If (isxdigit (szToDecode [I + 1]) & isxdigit (szToDecode [I + 2])

{

Std: string hexStr = szToDecode. substr (I + 1, 2 );

Hex = strtol (hexStr. c_str (), 0, 16 );

// Letters and numbers [0-9a-zA-Z], some special symbols [$-_. +! * '(),], And some reserved words [$ & +,/:; =? @]

// URL can be used directly without Encoding

If (! (Hex> = 48 & hex <= 57) | // 0-9

(Hex> = 97 & hex <= 122) | // a-z

(Hex> = 65 & hex <= 90) | // A-Z

// Some special symbols and reserved words [$-_. +! * '(),] [$ & +,/:; =? @]

Hex = 0x21 | hex = 0x24 | hex = 0x26 | hex = 0x27 | hex = 0x28 | hex = 0x29

| Hex = 0x2a | hex = 0x2b | hex = 0x2c | hex = 0x2d | hex = 0x2e | hex = 0x2f

| Hex = 0x3A | hex = 0x3B | hex = 0x3D | hex = 0x3f | hex = 0x40 | hex = 0x5f

))

{

Result + = char (hex );

I + = 2;

}

Else result + = '% ';

} Else {

Result + = '% ';

}

Break;

Default:

Result + = szToDecode [I];

Break;

}

}

Return result;

}

/*

Int main ()

{

String test_str1 = "refreshing ";

String test_str2 = UrlEncode (test_str1 );

Cout <test_str2 <endl;

}

*/