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/*
* $Id$
* Copyright (C) 2002 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.render.ps;
import java.io.OutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
/**
* This class applies a ASCII Hex encoding to the stream.
*
* @author <a href="mailto:jeremias.maerki@outline.ch">Jeremias Maerki</a>
* @version $Id$
*/
public class ASCIIHexOutputStream extends FilterOutputStream
implements Finalizable {
private static final int EOL = 0x0A; //"\n"
private static final int EOD = 0x3E; //">"
private static final int ZERO = 0x30; //"0"
private static final int NINE = 0x39; //"9"
private static final int A = 0x41; //"A"
private static final int ADIFF = A - NINE - 1;
private int posinline = 0;
/** @see java.io.FilterOutputStream **/
public ASCIIHexOutputStream(OutputStream out) {
super(out);
}
/** @see java.io.FilterOutputStream **/
public void write(int b) throws IOException {
b &= 0xFF;
int digit1 = ((b & 0xF0) >> 4) + ZERO;
if (digit1 > NINE) {
digit1 += ADIFF;
}
out.write(digit1);
int digit2 = (b & 0x0F) + ZERO;
if (digit2 > NINE) {
digit2 += ADIFF;
}
out.write(digit2);
posinline++;
checkLineWrap();
}
private void checkLineWrap() throws IOException {
//Maximum line length is 80 characters
if (posinline >= 40) {
out.write(EOL);
posinline = 0;
}
}
/** @see org.apache.fop.render.ps.Finalizable **/
public void finalizeStream() throws IOException {
checkLineWrap();
//Write closing character ">"
super.write(EOD);
flush();
if (out instanceof Finalizable) {
((Finalizable) out).finalizeStream();
}
}
/** @see java.io.FilterOutputStream **/
public void close() throws IOException {
finalizeStream();
super.close();
}
}
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