Java ByteBuffer Read readHexString(ByteBuffer buffer, int nrBytes)

Description

read Hex String

License

Apache License

Declaration

public static String readHexString(ByteBuffer buffer, int nrBytes) 

Method Source Code

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

import java.nio.ByteBuffer;

public class Main {
    private static final char[] HEX = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
            'F' };

    public static String readHexString(ByteBuffer buffer, int nrBytes) {
        byte[] bytes = new byte[nrBytes];
        for (int i = bytes.length - 1; i >= 0; i--) {
            bytes[i] = buffer.get();/*  ww  w  . j a  v  a  2  s  .c o m*/
        }
        return toHexString(bytes);
    }

    public static String toHexString(byte value) {
        return new String(new char[] { HEX[(value >>> 4) & 0xf], HEX[(value >>> 0) & 0xf] });
    }

    public static String toHexString(byte[] bytes) {
        return toHexString(bytes, 0, bytes.length, 0);
    }

    public static String toHexString(byte[] bytes, int offset, int length, int spacing) {
        StringBuilder sb = new StringBuilder();
        for (int ix = offset; ix < offset + length; ix++) {
            sb.append(HEX[(bytes[ix] >>> 4) & 0xf]);
            sb.append(HEX[bytes[ix] & 0xf]);
            if (spacing > 0 && ix % spacing == spacing - 1 && ix < offset + length - 1) {
                sb.append(' ');
            }
        }
        return sb.toString();
    }

    public static String toHexString(ByteBuffer byteBuffer) {
        byteBuffer.rewind();
        return toHexString(byteBuffer.array(), byteBuffer.arrayOffset() + byteBuffer.position(),
                byteBuffer.remaining(), 4);
    }

    public static String toHexString(int value) {
        return new String(new char[] { HEX[(value >>> 28) & 0xf], HEX[(value >>> 24) & 0xf],
                HEX[(value >>> 20) & 0xf], HEX[(value >>> 16) & 0xf], HEX[(value >>> 12) & 0xf],
                HEX[(value >>> 8) & 0xf], HEX[(value >>> 4) & 0xf], HEX[(value >>> 0) & 0xf] });
    }

    public static String toHexString(short value) {
        return new String(new char[] { HEX[(value >>> 12) & 0xf], HEX[(value >>> 8) & 0xf],
                HEX[(value >>> 4) & 0xf], HEX[(value >>> 0) & 0xf] });
    }
}

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