util/src/main/java/org/jf/util/NibbleUtils.java

/*
 * Copyright 2012, Google Inc.
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package org.jf.util;

public abstract class NibbleUtils {
    /**
     * Extracts the high signed 4-bit nibble from the least significant
     * byte of the given value
     * @param value the value to extract the nibble from
     * @return the extracted signed nibble value
     */
    public static int extractHighSignedNibble(int value) {
        return (value << 24) >> 28;
    }

    /**
     * Extracts the low signed 4-bit nibble from the least significant
     * byte of the given value
     * @param value the value to extract the nibble from
     * @return the extracted signed nibble value
     */
    public static int extractLowSignedNibble(int value) {
        return (value << 28) >> 28;
    }

    /**
     * Extracts the high unsigned 4-bit nibble from the least significant
     * byte of the given value
     * @param value the value to extract the nibble from
     * @return the extracted unsigned nibble value
     */
    public static int extractHighUnsignedNibble(int value) {
        return (value & 0xF0) >>> 4;
    }

    /**
     * Extracts the low unsigned 4-bit nibble from the least significant
     * byte of the given value
     * @param value the value to extract the nibble from
     * @return the extracted unsigned nibble value
     */
    public static int extractLowUnsignedNibble(int value) {
        return value & 0x0F;
    }
}