Java Text Parse textToNumericFormat(String src)

Description

Converts IPv4 address in its textual presentation form into its numeric binary form.

License

Apache License

Parameter

Parameter	Description
src	a String representing an IPv4 address in standard format

Return

a byte array representing the IPv4 numeric address

Declaration

public static byte[] textToNumericFormat(String src) 

Method Source Code

//package com.java2s;
/* //from  w w  w. ja v a2 s . com
 * Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */

public class Main {
    public static final int INADDRSZ = 4;

    /**
     * Converts IPv4 address in its textual presentation form into its numeric binary form.
     * 
     * @param src
     *            a String representing an IPv4 address in standard format
     * @return a byte array representing the IPv4 numeric address
     */
    public static byte[] textToNumericFormat(String src) {
        if (src == null || src.length() == 0) {
            return null;
        }
        int octets;
        char ch;
        byte[] dst = new byte[INADDRSZ];
        char[] srcb = src.toCharArray();
        boolean sawDigit = false;

        octets = 0;
        int i = 0;
        int cur = 0;
        while (i < srcb.length) {
            ch = srcb[i++];
            if (Character.isDigit(ch)) {
                int sum = dst[cur] * 10 + (Character.digit(ch, 10) & 0xff);

                if (sum > 255) {
                    return null;
                }
                dst[cur] = (byte) (sum & 0xff);
                if (!sawDigit) {
                    if (++octets > INADDRSZ) {
                        return null;
                    }
                    sawDigit = true;
                }
            } else if (ch == '.' && sawDigit) {
                if (octets == INADDRSZ) {
                    return null;
                }
                cur++;
                dst[cur] = 0;
                sawDigit = false;
            } else {
                return null;
            }
        }

        if (octets < INADDRSZ) {
            return null;
        }
        return dst;
    }
}

Related

1. textToBytes(String text)
2. textToCDATA(String text)
3. textToInteger(String filename, String text, String name)
4. textToInteger(String text)
5. textToMMDDYYYY(String pdata)
6. textToNumericFormatV4(String host)
7. textToNumericFormatV4(String ipString)
8. textToNumericFormatV4(String src)
9. textToNumericFormatV6(String src)