Mega Code Archive
Utility class for URL decoding
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//package flex.messaging.util;
import java.io.UnsupportedEncodingException;
/**
* Utility class for URL decoding.
*
*@exclude
*/
public final class URLDecoder
{
public static String decode(String s)
{
try
{
return decode(s, "UTF8");
}
catch (UnsupportedEncodingException ex)
{
throw new IllegalArgumentException("UTF8");
}
}
public static String decode(String s, String enc) throws UnsupportedEncodingException
{
if (!needsDecoding(s))
{
return s;
}
int length = s.length();
byte[] bytes = new byte[length];
// FIXME: This needs to specify a character encoding (ASCII?)
s.getBytes(0, length, bytes, 0);
int k = 0;
length = bytes.length;
for (int i = 0; i < length; i++)
{
if (bytes[i] == '%')
{
while (bytes[i + 1] == '%')
{
i++;
}
if (i < length - 2)
{
bytes[k] = x2c(bytes, i);
i += 2;
}
else
{
throw new IllegalArgumentException(s);
}
}
else if (bytes[i] == '+')
{
bytes[k] = (byte)' ';
}
else
{
bytes[k] = bytes[i];
}
k++;
}
return new String(bytes, 0, k, enc);
}
private static boolean needsDecoding(String s)
{
if (s == null)
{
return false;
}
int length = s.length();
for (int i = 0; i < length; i++)
{
int c = (int)s.charAt(i);
if (c == '+' || c == '%')
{
return true;
}
}
return false;
}
private static byte x2c(byte[] b, int i)
{
int result;
byte b1 = b[i + 1];
byte b2 = b[i + 2];
// return Byte.parseByte("" + (char) b1 + (char) b2, 16);
if (b1 < '0' || (b1 > 'F' && b1 < 'a') || b1 > 'f' ||
b2 < '0' || (b2 > 'F' && b2 < 'a') || b2 > 'f')
{
throw new IllegalArgumentException("%" + (char)b1 + (char)b2);
}
result = b1 >= 'A' ? (b1 & 0xdf) - 'A' + 10 : b1 - '0';
result *= 16;
result += b2 >= 'A' ? (b2 & 0xdf) - 'A' + 10 : b2 - '0';
return (byte)result;
}
}
]]>