public static byte[] textToNumericFormatV4(String src) {
if (src.length() == 0) {
return null;
}
byte[] res = new byte[INADDR4SZ];
String[] s = src.split("\\.", -1);
long val;
try {
switch(s.length) {
case 1:
/*
* When only one part is given, the value is stored directly in
* the network address without any byte rearrangement.
*/
val = Long.parseLong(s[0]);
if (val < 0 || val > 0xffffffffL)
return null;
res[0] = (byte) ((val > > 24) & 0xff);
res[1] = (byte) (((val & 0xffffff) > > 16) & 0xff);
res[2] = (byte) (((val & 0xffff) > > 8) & 0xff);
res[3] = (byte) (val & 0xff);
break;
case 2:
/*
* When a two part address is supplied, the last part is
* interpreted as a 24-bit quantity and placed in the right
* most three bytes of the network address. This makes the
* two part address format convenient for specifying Class A
* network addresses as net.host.
*/
val = Integer.parseInt(s[0]);
if (val < 0 || val > 0xff)
return null;
res[0] = (byte) (val & 0xff);
val = Integer.parseInt(s[1]);
if (val < 0 || val > 0xffffff)
return null;
res[1] = (byte) ((val > > 16) & 0xff);
res[2] = (byte) (((val & 0xffff) > > 8) &0xff);
res[3] = (byte) (val & 0xff);
break;
case 3:
/*
* When a three part address is specified, the last part is
* interpreted as a 16-bit quantity and placed in the right
* most two bytes of the network address. This makes the
* three part address format convenient for specifying
* Class B net- work addresses as 128.net.host.
*/
for (int i = 0; i < 2; i++) {
val = Integer.parseInt(s[i]);
if (val < 0 || val > 0xff)
return null;
res[i] = (byte) (val & 0xff);
}
val = Integer.parseInt(s[2]);
if (val < 0 || val > 0xffff)
return null;
res[2] = (byte) ((val > > 8) & 0xff);
res[3] = (byte) (val & 0xff);
break;
case 4:
/*
* When four parts are specified, each is interpreted as a
* byte of data and assigned, from left to right, to the
* four bytes of an IPv4 address.
*/
for (int i = 0; i < 4; i++) {
val = Integer.parseInt(s[i]);
if (val < 0 || val > 0xff)
return null;
res[i] = (byte) (val & 0xff);
}
break;
default:
return null;
}
} catch(NumberFormatException e) {
return null;
}
return res;
}
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