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/*******************************************************************************
* Copyright (c) 2000, 2019 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal.webapp.servlet;
import java.io.*;
/**
* Filters output stream and inserts specified bytes before the end of HEAD
* element (before </html> tag) of HTML in the stream.
*/
public class FilterHTMLHeadOutputStream extends FilterOutputStream {
private static final int STATE_START = 0;
private static final int STATE_LT = 1;
private static final int STATE_LT_SLASH = 2;
private static final int STATE_LT_SLASH_H = 3;
private static final int STATE_LT_SLASH_HE = 4;
private static final int STATE_LT_SLASH_HEA = 5;
private static final int STATE_LT_SLASH_HEAD = 6;
private static final int STATE_DONE = 7;
private int state = STATE_START;
private byte[] toInsert;
ByteArrayOutputStream buffer = new ByteArrayOutputStream(7);
/**
* Constructor.
*
* @param out
* sink output stream
* @param bytesToInsert
* bytes to insert in head of HTML
*/
public FilterHTMLHeadOutputStream(OutputStream out, byte[] bytesToInsert) {
super(out);
toInsert = bytesToInsert;
}
/**
* Writes the specified <code>byte</code> to this output stream.
* <p>
* The underlying stream might have a more bytes written to it, following
* the <head> HTML element.
* <p>
* Implements the abstract <tt>write</tt> method of <tt>OutputStream</tt>.
*
* @param b
* the <code>byte</code>.
* @exception IOException
* if an I/O error occurs.
*/
@Override
public final void write(int b) throws IOException {
switch (state) {
case STATE_START:
if (b == '<') {
buffer.write(b);
state = STATE_LT;
} else {
out.write(b);
}
break;
case STATE_LT:
buffer.write(b);
if (b == '/') {
state = STATE_LT_SLASH;
} else {
reset();
}
break;
case STATE_LT_SLASH:
buffer.write(b);
if (b == 'h' || b == 'H') {
state = STATE_LT_SLASH_H;
} else {
reset();
}
break;
case STATE_LT_SLASH_H:
buffer.write(b);
if (b == 'e' || b == 'E') {
state = STATE_LT_SLASH_HE;
} else {
reset();
}
break;
case STATE_LT_SLASH_HE:
buffer.write(b);
if (b == 'a' || b == 'A') {
state = STATE_LT_SLASH_HEA;
} else {
reset();
}
break;
case STATE_LT_SLASH_HEA:
buffer.write(b);
if (b == 'd' || b == 'D') {
state = STATE_LT_SLASH_HEAD;
} else {
reset();
}
break;
case STATE_LT_SLASH_HEAD:
buffer.write(b);
if (b == '>') {
out.write(toInsert);
out.write('\n');
reset();
state = STATE_DONE;
} else {
reset();
}
break;
default: // (case STATE_DONE):
out.write(b);
break;
}
}
private void reset() throws IOException {
out.write(buffer.toByteArray());
buffer.reset();
state = STATE_START;
}
@Override
public void write(byte b[], int off, int len) throws IOException {
if (state == STATE_DONE) {
out.write(b, off, len);
} else {
for (int i = 0; i < len; i++) {
write(b[off + i]);
}
}
}
@Override
public void close() throws IOException {
reset();
super.close();
}
}
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