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/*
* Copyright 2008 CoreMedia AG, Hamburg
*
* 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.
*/
package com.coremedia.iso.boxes;
import com.coremedia.iso.BoxParser;
import com.coremedia.iso.ChannelHelper;
import com.coremedia.iso.IsoTypeWriter;
import com.googlecode.mp4parser.AbstractBox;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.LinkedList;
import java.util.List;
import static com.googlecode.mp4parser.util.CastUtils.l2i;
/**
* A free box. Just a placeholder to enable editing without rewriting the whole file.
*/
public class FreeBox implements Box {
public static final String TYPE = "free";
ByteBuffer data;
List<Box> replacers = new LinkedList<Box>();
private ContainerBox parent;
public FreeBox() {
}
public FreeBox(int size) {
this.data = ByteBuffer.allocate(size);
}
public ByteBuffer getData() {
return data;
}
public void setData(ByteBuffer data) {
this.data = data;
}
public void getBox(WritableByteChannel os) throws IOException {
for (Box replacer : replacers) {
replacer.getBox(os);
}
ByteBuffer header = ByteBuffer.allocate(8);
IsoTypeWriter.writeUInt32(header, 8 + data.limit());
header.put(TYPE.getBytes());
header.rewind();
os.write(header);
data.rewind();
os.write(data);
}
public ContainerBox getParent() {
return parent;
}
public void setParent(ContainerBox parent) {
this.parent = parent;
}
public long getSize() {
long size = 8;
for (Box replacer : replacers) {
size += replacer.getSize();
}
size += data.limit();
return size;
}
public String getType() {
return TYPE;
}
public void parse(ReadableByteChannel readableByteChannel, ByteBuffer header, long contentSize, BoxParser boxParser) throws IOException {
if (readableByteChannel instanceof FileChannel && contentSize > 1024 * 1024) {
// It's quite expensive to map a file into the memory. Just do it when the box is larger than a MB.
data = ((FileChannel) readableByteChannel).map(FileChannel.MapMode.READ_ONLY, ((FileChannel) readableByteChannel).position(), contentSize);
((FileChannel) readableByteChannel).position(((FileChannel) readableByteChannel).position() + contentSize);
} else {
assert contentSize < Integer.MAX_VALUE;
data = ChannelHelper.readFully(readableByteChannel, contentSize);
}
}
public void addAndReplace(Box box) {
data.position(l2i(box.getSize()));
data = data.slice();
replacers.add(box);
}
}
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