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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.util;
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@apache.org">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 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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