Java BigInteger Calculate getHexString(BigInteger bigInt)

License

Parameter

Return

Declaration

public static String getHexString(BigInteger bigInt) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.math.BigInteger;

public class Main {
    /****************************************************************************
     * Get hex string for the supplied big integer: "0x<hex string>" where hex
     * string is outputted in groups of exactly four characters sub-divided by
     * spaces.// www  .j  av  a  2s  .c  om
     * 
     * @param bigInt
     *            Big integer
     * @return Hex string
     */
    public static String getHexString(BigInteger bigInt) {
        // Convert number to hex string
        String hex = bigInt.toString(16).toUpperCase();

        // Get number padding bytes
        int padding = (4 - (hex.length() % 4));

        // Insert any required padding to get groups of exactly 4 characters
        if ((padding > 0) && (padding < 4)) {
            StringBuilder sb = new StringBuilder(hex);

            for (int i = 0; i < padding; i++) {
                sb.insert(0, '0');
            }

            hex = sb.toString();
        }

        // Output with leading "0x" and spaces to form groups
        StringBuilder strBuff = new StringBuilder();

        strBuff.append("0x");

        for (int i = 0; i < hex.length(); i++) {
            strBuff.append(hex.charAt(i));

            if ((((i + 1) % 4) == 0) && ((i + 1) != hex.length())) {
                strBuff.append(' ');
            }
        }

        return strBuff.toString();
    }

    /**
     * Get hex string for the supplied byte array: "0x<hex string>" where hex
     * string is outputted in groups of exactly four characters sub-divided by
     * spaces.
     * 
     * @param bytes
     *            Byte array
     * @return Hex string
     */
    public static String getHexString(byte[] bytes) {
        return getHexString(new BigInteger(1, bytes));
    }
}

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