/**
* @(#)DataChunkOutputStream.java 1.0 2008-08-11
*
* Copyright (c) 2008 Werner Randelshofer
* Hausmatt 10, CH-6405 Immensee, Switzerland
* All rights reserved.
*
* The copyright of this software is owned by Werner Randelshofer.
* You may not use, copy or modify this software, except in
* accordance with the license agreement you entered into with
* Werner Randelshofer. For details see accompanying license terms.
*/
package evopaint.util.avi;
import java.io.*;
import java.util.GregorianCalendar;
/**
* This output stream filter supports common data types used inside
* of AVI RIFF Data Chunks.
*
* @author Werner Randelshofer
* @version 1.0 2008-08-11 Created.
*/
public class DataChunkOutputStream extends FilterOutputStream {
protected static final long MAC_TIMESTAMP_EPOCH = new GregorianCalendar(1904, GregorianCalendar.JANUARY, 1).getTimeInMillis();
/**
* The number of bytes written to the data output stream so far.
* If this counter overflows, it will be wrapped to Integer.MAX_VALUE.
*/
protected long written;
public DataChunkOutputStream(OutputStream out) {
super(out);
}
/**
* Writes an Atom Type identifier (4 bytes).
* @param s A string with a length of 4 characters.
*/
public void writeType(String s) throws IOException {
if (s.length() != 4) {
throw new IllegalArgumentException("type string must have 4 characters");
}
try {
out.write(s.getBytes("ASCII"), 0, 4);
incCount(4);
} catch (UnsupportedEncodingException e) {
throw new InternalError(e.toString());
}
}
/**
* Writes out a <code>byte</code> to the underlying output stream as
* a 1-byte value. If no exception is thrown, the counter
* <code>written</code> is incremented by <code>1</code>.
*
* @param v a <code>byte</code> value to be written.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterOutputStream#out
*/
public final void writeByte(int v) throws IOException {
out.write(v);
incCount(1);
}
/**
* Writes <code>len</code> bytes from the specified byte array
* starting at offset <code>off</code> to the underlying output stream.
* If no exception is thrown, the counter <code>written</code> is
* incremented by <code>len</code>.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterOutputStream#out
*/
@Override
public synchronized void write(byte b[], int off, int len)
throws IOException {
out.write(b, off, len);
incCount(len);
}
/**
* Writes the specified byte (the low eight bits of the argument
* <code>b</code>) to the underlying output stream. If no exception
* is thrown, the counter <code>written</code> is incremented by
* <code>1</code>.
* <p>
* Implements the <code>write</code> method of <code>OutputStream</code>.
*
* @param b the <code>byte</code> to be written.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterOutputStream#out
*/
@Override
public synchronized void write(int b) throws IOException {
out.write(b);
incCount(1);
}
/**
* Writes an <code>int</code> to the underlying output stream as four
* bytes, high byte first. If no exception is thrown, the counter
* <code>written</code> is incremented by <code>4</code>.
*
* @param v an <code>int</code> to be written.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterOutputStream#out
*/
public void writeInt(int v) throws IOException {
out.write((v >>> 0) & 0xff);
out.write((v >>> 8) & 0xff);
out.write((v >>> 16) & 0xff);
out.write((v >>> 24) & 0xff);
incCount(4);
}
/**
* Writes an unsigned 32 bit integer value.
*
* @param v The value
* @throws java.io.IOException
*/
public void writeUInt(long v) throws IOException {
out.write((int) ((v >>> 0) & 0xff));
out.write((int) ((v >>> 8) & 0xff));
out.write((int) ((v >>> 16) & 0xff));
out.write((int) ((v >>> 24) & 0xff));
incCount(4);
}
/**
* Writes a signed 16 bit integer value.
*
* @param v The value
* @throws java.io.IOException
*/
public void writeShort(int v) throws IOException {
out.write((int) ((v >>> 0) & 0xff));
out.write((int) ((v >> 8) & 0xff));
incCount(2);
}
public void writeLong(long v) throws IOException {
out.write((int) (v >>> 0) & 0xff);
out.write((int) (v >>> 8) & 0xff);
out.write((int) (v >>> 16) & 0xff);
out.write((int) (v >>> 24) & 0xff);
out.write((int) (v >>> 32) & 0xff);
out.write((int) (v >>> 40) & 0xff);
out.write((int) (v >>> 48) & 0xff);
out.write((int) (v >>> 56) & 0xff);
incCount(8);
}
public void writeUShort(int v) throws IOException {
out.write((int) ((v >>> 0) & 0xff));
out.write((int) ((v >> 8) & 0xff));
incCount(2);
}
/**
* Increases the written counter by the specified value
* until it reaches Long.MAX_VALUE.
*/
protected void incCount(int value) {
long temp = written + value;
if (temp < 0) {
temp = Long.MAX_VALUE;
}
written = temp;
}
/**
* Returns the current value of the counter <code>written</code>,
* the number of bytes written to this data output stream so far.
* If the counter overflows, it will be wrapped to Integer.MAX_VALUE.
*
* @return the value of the <code>written</code> field.
* @see java.io.DataOutputStream#written
*/
public final long size() {
return written;
}
/**
* Sets the value of the counter <code>written</code> to 0.
*/
public void clearCount() {
written = 0;
}
}