org.jgroups.util.ByteArrayDataOutputStream Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.util;

import java.io.DataOutput;
import java.util.Arrays;

/**
 * Implements {@link java.io.DataOutput} over a byte[] buffer. The byte[] buffer expands when needed; however, it
 * doesn't double but only expands minimally, to accommodate the additional data.
 * It is therefore recommended to always size the buffer to the actual number of bytes needed.
 * This class is not thread safe.
 * @author Bela Ban
 * @since  3.5
 */
public class ByteArrayDataOutputStream implements DataOutput {
    protected byte[] buf;
    protected int    pos;

    public ByteArrayDataOutputStream() {
        this(32);
    }

    public ByteArrayDataOutputStream(int capacity) {
        this.buf=new byte[capacity];
    }

    public ByteArrayDataOutputStream position(int pos) {
        this.pos=checkBounds(pos); return this;
    }

    public int    position()  {return pos;}
    public byte[] buffer()    {return buf;}
    public Buffer getBuffer() {return new Buffer(buf, 0, pos);}


    public void write(int b) {
        ensureCapacity(1);
        buf[pos++]=(byte)b;
    }

    public void write(byte[] b) {
        write(b, 0, b.length);
    }

    public void write(byte[] b, int off, int len) {
        if ((off < 0) || (off > b.length) || (len < 0) || ((off + len) - b.length > 0))
            throw new IndexOutOfBoundsException();
        ensureCapacity(len);

        System.arraycopy(b, off, buf, pos, len);
        pos+=len;
    }

    public void writeBoolean(boolean v) {
        write(v ? 1 : 0);
    }

    public void writeByte(int v) {
        write(v);
    }

    public void writeShort(int v) {
        write((v >>> 8) & 0xFF);
        write((v >>> 0) & 0xFF);
    }

    public void writeChar(int v) {
        write((v >>> 8) & 0xFF);
        write((v >>> 0) & 0xFF);
    }

    public void writeInt(int v) {
        write((v >>> 24) & 0xFF);
        write((v >>> 16) & 0xFF);
        write((v >>>  8) & 0xFF);
        write((v >>>  0) & 0xFF);
    }

    public void writeLong(long v) {
        write((byte)(v >>> 56));
        write((byte)(v >>> 48));
        write((byte)(v >>> 40));
        write((byte)(v >>> 32));
        write((byte)(v >>> 24));
        write((byte)(v >>> 16));
        write((byte)(v >>>  8));
        write((byte)(v >>>  0));
    }

    public void writeFloat(float v) {
        writeInt(Float.floatToIntBits(v));
    }

    public void writeDouble(double v) {
        writeLong(Double.doubleToLongBits(v));
    }

    public void writeBytes(String s) {
        int len=s != null? s.length() : 0;
        if(len > 0)
            ensureCapacity(len);
        for(int i = 0 ; i < len ; i++)
            write((byte)s.charAt(i));
    }

    public void writeChars(String s) {
        int len=s != null? s.length() : 0;
        if(len > 0)
            ensureCapacity(len *2); // 2 bytes per char

        for(int i = 0 ; i < len ; i++) {
            int v = s.charAt(i);
            writeChar(v);
        }
    }

    public void writeUTF(String str) {
        int strlen=str != null? str.length() : 0;
        if(strlen > 0)
            ensureCapacity(strlen *2 + 2);

        int utflen = 0;
        int c, count = 0;

        if(str == null) {
            writeShort(-1);
            return;
        }

        /* use charAt instead of copying String to char array */
        for (int i = 0; i < strlen; i++) {
            c = str.charAt(i);
            if ((c >= 0x0001) && (c <= 0x007F))
                utflen++;
            else if (c > 0x07FF)
                utflen += 3;
            else
                utflen += 2;
        }

        if (utflen > 65535)
            throw new IllegalArgumentException("encoded string too long: " + utflen + " bytes");

        byte[] bytearr=new byte[utflen+2];

        bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
        bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);

        int i=0;
        for (i=0; i= 0x0001) && (c <= 0x007F))) break;
            bytearr[count++] = (byte) c;
        }

        for (;i < strlen; i++){
            c = str.charAt(i);
            if ((c >= 0x0001) && (c <= 0x007F)) {
                bytearr[count++] = (byte) c;

            } else if (c > 0x07FF) {
                bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
                bytearr[count++] = (byte) (0x80 | ((c >>  6) & 0x3F));
                bytearr[count++] = (byte) (0x80 | ((c >>  0) & 0x3F));
            } else {
                bytearr[count++] = (byte) (0xC0 | ((c >>  6) & 0x1F));
                bytearr[count++] = (byte) (0x80 | ((c >>  0) & 0x3F));
            }
        }
        write(bytearr, 0, utflen+2);
    }

    public String toString() {
        return "pos=" + pos + " lim=" + buf.length;
    }

    protected int checkBounds(int pos) {
        if(pos < 0 || pos > buf.length)
            throw new IndexOutOfBoundsException("pos=" + pos + ", length=" + buf.length);
        return pos;
    }

    protected void ensureCapacity(int bytes) {
        if(pos + bytes > buf.length) {
            int new_size=buf.length + bytes + 32;
            buf=Arrays.copyOf(buf, new_size);
        }
    }
}