This is a relative method for getting a single unsigned byte from ByteBuffer. - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

This is a relative method for getting a single unsigned byte from ByteBuffer.

Demo Code


//package com.java2s;

import java.nio.ByteBuffer;

public class Main {
    /**/*from   ww w .j a  v a2s.com*/
     * This is a relative method for getting a single unsigned byte.  Unlike
     * {@link ByteBuffer#get()}, this method won't do sign-extension.
     *
     * @param buf The {@link ByteBuffer} to get the byte from.
     * @return Returns an unsigned integer in the range 0-256.
     * @throws BufferUnderflowException if the buffer's current position is not
     * smaller than its limit.
     */
    public static int getUnsignedByte(ByteBuffer buf) {
        return buf.get() & 0x000000FF;
    }

    /**
     * This is an absolute method for getting a single unsigned byte.  Unlike
     * {@link ByteBuffer#get(int)}, this method won't do sign-extension.
     *
     * @param buf The {@link ByteBuffer} to get the byte from.
     * @param offset The absolute offset within the {@link ByteBuffer} of the
     * first byte to read; must be non-negative.
     * @return Returns an unsigned integer in the range 0-256.
     * @throws BufferUnderflowException if the buffer's current position is not
     * smaller than its limit.
     * @throws IllegalArgumentException if the offset is either negative or
     * beyond the buffer's limit.
     */
    public static int getUnsignedByte(ByteBuffer buf, int offset) {
        try {
            return buf.get(offset) & 0x000000FF;
        } catch (IndexOutOfBoundsException e) {
            throw new IllegalArgumentException(e);
        }
    }
}

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