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Java 文本到数字格式IPv6

欢马劈雪

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文本到数字格式IPv6

实例源码：

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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

* This code is free software; you can redistribute it and/or modify it

* under the terms of the GNU General Public License version 2 only, as

* published by the Free Software Foundation.  Oracle designates this

* particular file as subject to the "Classpath" exception as provided

* by Oracle in the LICENSE file that accompanied this code.

* This code is distributed in the hope that it will be useful, but WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

* version 2 for more details (a copy is included in the LICENSE file that

* accompanied this code).

* You should have received a copy of the GNU General Public License version

* 2 along with this work; if not, write to the Free Software Foundation,

* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

* or visit www.oracle.com if you need additional information or have any

* questions.

//package com.nowjava;

public class Main {
/* from 
时 代 J a v a - nowjava.com*/

public static void main(String[] argv) throws Exception {

String src = "nowjava.com";

System.out.println(java.util.Arrays

.toString(textToNumericFormatV6(src)));

}

private static final int INADDR4SZ = 4;

private static final int INADDR16SZ = 16;

private static final int INT16SZ = 2;

public static byte[] textToNumericFormatV6(String src) {

// Shortest valid string is "::", hence at least 2 chars
        /**
        来 自 时 代 J a v a
        **/

if (src.length() < 2) {

return null;

}

int colonp;

char ch;

boolean saw_xdigit;

int val;

char[] srcb = src.toCharArray();

byte[] dst = new byte[INADDR16SZ];

int srcb_length = srcb.length;

int pc = src.indexOf('%');

if (pc == srcb_length - 1) {

return null;

}

if (pc != -1) {

srcb_length = pc;

}

colonp = -1;

int i = 0, j = 0;

/* Leading :: requires some special handling. */

if (srcb[i] == ':')

if (srcb[++i] != ':')

return null;

int curtok = i;

saw_xdigit = false;

val = 0;

while (i < srcb_length) {

ch = srcb[i++];

int chval = Character.digit(ch, 16);

if (chval != -1) {

val <<= 4;

val |= chval;

if (val > 0xffff)

return null;

saw_xdigit = true;

continue;

}

if (ch == ':') {

curtok = i;

if (!saw_xdigit) {

if (colonp != -1)

return null;

colonp = j;

continue;

} else if (i == srcb_length) {

return null;

}

if (j + INT16SZ > INADDR16SZ)

return null;

dst[j++] = (byte) ((val >> 8) & 0xff);

dst[j++] = (byte) (val & 0xff);

saw_xdigit = false;

val = 0;

continue;

}

if (ch == '.' && ((j + INADDR4SZ) <= INADDR16SZ)) {

String ia4 = src.substring(curtok, srcb_length);

/* check this IPv4 address has 3 dots, ie. A.B.C.D */

int dot_count = 0, index = 0;

while ((index = ia4.indexOf('.', index)) != -1) {

dot_count++;

index++;

}

if (dot_count != 3) {

return null;

}

byte[] v4addr = textToNumericFormatV4(ia4);

if (v4addr == null) {

return null;

}

for (int k = 0; k < INADDR4SZ; k++) {

dst[j++] = v4addr[k];

}

saw_xdigit = false;

break; /* '\0' was seen by inet_pton4(). */

}

return null;

}

if (saw_xdigit) {

if (j + INT16SZ > INADDR16SZ)

return null;

dst[j++] = (byte) ((val >> 8) & 0xff);

dst[j++] = (byte) (val & 0xff);

}

if (colonp != -1) {

int n = j - colonp;

if (j == INADDR16SZ)

return null;

for (i = 1; i <= n; i++) {

dst[INADDR16SZ - i] = dst[colonp + n - i];

dst[colonp + n - i] = 0;

}

j = INADDR16SZ;

}

if (j != INADDR16SZ)

return null;

byte[] newdst = convertFromIPv4MappedAddress(dst);

if (newdst != null) {

return newdst;

} else {

return dst;

}

@SuppressWarnings("fallthrough")

public static byte[] textToNumericFormatV4(String src) {

byte[] res = new byte[INADDR4SZ];

long tmpValue = 0;

int currByte = 0;

boolean newOctet = true;

int len = src.length();

if (len == 0 || len > 15) {

return null;

}

* When only one part is given, the value is stored directly in

* the network address without any byte rearrangement.

* 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.

* 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.

* 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.

* We determine and parse the leading parts, if any, as single

* byte values in one pass directly into the resulting byte[],

* then the remainder is treated as a 8-to-32-bit entity and

* translated into the remaining bytes in the array.

for (int i = 0; i < len; i++) {

char c = src.charAt(i);

if (c == '.') {

if (newOctet || tmpValue < 0 || tmpValue > 0xff

|| currByte == 3) {

return null;

}

res[currByte++] = (byte) (tmpValue & 0xff);

tmpValue = 0;

newOctet = true;

} else {

int digit = Character.digit(c, 10);

if (digit < 0) {

return null;

}

tmpValue *= 10;

tmpValue += digit;

newOctet = false;

}

if (newOctet || tmpValue < 0

|| tmpValue >= (1L << ((4 - currByte) * 8))) {

return null;

}

switch (currByte) {

case 0:

res[0] = (byte) ((tmpValue >> 24) & 0xff);
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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