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/* Copyright (c) 2015, David A. Clunie DBA Pixelmed Publishing. All rights reserved. */
package com.pixelmed.codec.jpeg;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteOrder;
/**
* <p>A class that allows writing to either an {@link java.io.OutputStream OutputStream}
* or a byte[] or short[] of preallocated size.</p>
*
* <p>An unallocated instance may be constructed but any attempt to write to it will
* fail until either an OutputStream is assigned or an array of the appropriate type
* is allocated. This allows, for example, the instance to be created and later
* allocated based on size information, e.g., as header information is encountered
* while decompressing before decompressed pixel values need to be written.</p>
*
* @author dclunie
*/
public class OutputArrayOrStream {
private static final String identString = "@(#) $Header: /userland/cvs/codec/com/pixelmed/codec/jpeg/OutputArrayOrStream.java,v 1.5 2016/01/16 13:30:09 dclunie Exp $";
protected OutputStream out = null;
protected ByteOrder order = null;
protected byte[] byteValues = null;
protected short[] shortValues = null;
protected int byteOffset = 0;
protected int shortOffset = 0;
public OutputArrayOrStream() {
// lazy allocation
}
public OutputArrayOrStream(OutputStream out,ByteOrder order) {
this.out = out;
this.order = order;
}
public OutputArrayOrStream(byte[] byteValues) {
this.byteValues = byteValues;
byteOffset = 0;
}
public OutputArrayOrStream(short[] shortValues) {
this.shortValues = shortValues;
shortOffset = 0;
}
public void setOutputStream(OutputStream out,ByteOrder order) throws IOException {
if (this.out != null || this.byteValues != null || this.shortValues != null) {
throw new IOException("Destination already allocated");
}
this.out = out;
this.order = order;
}
/**
* <p>Retrieves the OutputStream's byte order used when writing short values.</p>
*
* @return The OutputStream's byte order, or null if no OutputStream
*/
public ByteOrder order() {
return out == null ? null : order;
}
/**
* <p>Modifes the OutputStream's byte order used when writing short values.</p>
*
* @param order the new byte order, either BIG_ENDIAN or LITTLE_ENDIAN
* @throws IOException if no OutputStream assigned
*/
public void order(ByteOrder order) throws IOException {
if (out == null) {
throw new IOException("Cannot assign byte order if no OutputStream");
}
this.order = order;
}
public void allocateByteArray(int length) throws IOException {
if (this.out != null || this.byteValues != null || this.shortValues != null) {
throw new IOException("Destination already allocated");
}
this.byteValues = new byte[length];
byteOffset = 0;
}
public void allocateShortArray(int length) throws IOException {
if (this.out != null || this.byteValues != null || this.shortValues != null) {
throw new IOException("Destination already allocated");
}
this.shortValues = new short[length];
shortOffset = 0;
}
public OutputStream getOutputStream() {
return out;
}
public byte[] getByteArray() {
return byteValues;
}
public short[] getShortArray() {
return shortValues;
}
/**
* Writes the specified <code>byte</code> to this output.
*
* @param b the <code>byte</code>.
* @throws IOException if an I/O error occurs.
*/
public void writeByte(int b) throws IOException {
if (out != null) {
out.write(b);
}
else if (byteValues != null) {
byteValues[byteOffset++] = (byte)b;
}
else if (shortValues != null) {
throw new IOException("Cannot write byte value to short array");
}
else {
throw new IOException("Byte array not allocated yet");
}
}
/**
* Writes the specified <code>short</code> to this output.
*
* @param s the <code>short</code>.
* @throws IOException if an I/O error occurs.
*/
public void writeShort(int s) throws IOException {
if (out != null) {
if (order == ByteOrder.LITTLE_ENDIAN) {
out.write(s);
out.write(s>>8);
}
else {
out.write(s>>8);
out.write(s);
}
}
else if (shortValues != null) {
shortValues[shortOffset++] = (short)s;
}
else if (byteValues != null) {
throw new IOException("Cannot write short value to byte array");
}
else {
throw new IOException("Short array not allocated yet");
}
}
/**
* <p>Closes any assigned OutputStream.</p>
*
* <p>Does nothing if arrays allocated instead of an OutputStream (i.e., does NOT release them).</p>
*
* @throws IOException if an I/O error occurs.
*/
public void close() throws IOException {
if (out != null) {
out.close();
}
}
}
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