Java ByteBuffer Write writeInt4(final ByteBuffer bb, int value, int highValue, final boolean flush)

Description

write Int

License

Open Source License

Declaration

public static int writeInt4(final ByteBuffer bb, int value, int highValue, final boolean flush)
            throws IOException 

Method Source Code

//package com.java2s;
/*//from  w w  w.  jav  a 2 s. c  o  m
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
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import java.io.IOException;

import java.io.OutputStream;
import java.nio.ByteBuffer;

public class Main {
    public static void writeInt4(final OutputStream os, int value) throws IOException {
        int nibbleL;
        int nibbleH;
        do {
            nibbleH = value & 7;
            value >>>= 3;

            if (value != 0) {
                nibbleH |= 8;
                nibbleL = value & 7;
                value >>>= 3;
                if (value != 0) {
                    nibbleL |= 8;
                }
            } else {
                nibbleL = 0;
            }

            os.write(nibbleL | (nibbleH << 4));
        } while (value != 0);
    }

    public static int writeInt4(final OutputStream out, int value, int highValue, final boolean flush)
            throws IOException {
        int nibbleL;
        int nibbleH;

        if (highValue > 0) {
            highValue &= 0x70; // clear highest bit
            nibbleL = value & 7;
            value >>>= 3;
            if (value != 0) {
                nibbleL |= 8;
            }

            out.write(highValue | nibbleL);

            if (value == 0) {
                return 0;
            }
        }

        do {
            // shift nibbleH to high byte's bits
            nibbleH = (value & 7) << 4;
            value >>>= 3;

            if (value != 0) {
                nibbleH |= 0x80;
                nibbleL = value & 7;
                value >>>= 3;
                if (value != 0) {
                    nibbleL |= 8;
                }
            } else {
                if (!flush) {
                    return nibbleH | 0x80;
                }

                nibbleL = 0;
            }

            out.write(nibbleH | nibbleL);
        } while (value != 0);

        return 0;
    }

    public static int writeInt4(final ByteBuffer bb, int value, int highValue, final boolean flush)
            throws IOException {
        int nibbleL;
        int nibbleH;

        if (highValue > 0) {
            highValue &= 0x70; // clear highest bit
            nibbleL = value & 7;
            value >>>= 3;
            if (value != 0) {
                nibbleL |= 8;
            }

            bb.put((byte) (highValue | nibbleL));

            if (value == 0) {
                return 0;
            }
        }

        do {
            // shift nibbleH to high byte's bits
            nibbleH = (value & 7) << 4;
            value >>>= 3;

            if (value != 0) {
                nibbleH |= 0x80;
                nibbleL = value & 7;
                value >>>= 3;
                if (value != 0) {
                    nibbleL |= 8;
                }
            } else {
                if (!flush) {
                    return nibbleH | 0x80;
                }

                nibbleL = 0;
            }

            bb.put((byte) (nibbleH | nibbleL));
        } while (value != 0);

        return 0;
    }
}

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