package org.mp4parser.muxer;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import static org.mp4parser.tools.CastUtils.l2i;
/**
* Created by sannies on 10/15/13.
*/
public class MemoryDataSourceImpl implements DataSource {
ByteBuffer data;
public MemoryDataSourceImpl(byte[] data) {
this.data = ByteBuffer.wrap(data);
}
public MemoryDataSourceImpl(ByteBuffer buffer) {
this.data = buffer;
}
public int read(ByteBuffer byteBuffer) throws IOException {
if (0 == data.remaining() && 0 != byteBuffer.remaining()) {
return -1;
}
int size = Math.min(byteBuffer.remaining(), data.remaining());
if (byteBuffer.hasArray()) {
byteBuffer.put(data.array(), data.position(), size);
data.position(data.position() + size);
} else {
byte[] buf = new byte[size];
data.get(buf);
byteBuffer.put(buf);
}
return size;
}
public long size() throws IOException {
return data.capacity();
}
public long position() throws IOException {
return data.position();
}
public void position(long nuPos) throws IOException {
data.position(l2i(nuPos));
}
public long transferTo(long position, long count, WritableByteChannel target) throws IOException {
return target.write((ByteBuffer) ((ByteBuffer) data.position(l2i(position))).slice().limit(l2i(count)));
}
public ByteBuffer map(long startPosition, long size) throws IOException {
int oldPosition = data.position();
data.position(l2i(startPosition));
ByteBuffer result = data.slice();
result.limit(l2i(size));
data.position(oldPosition);
return result;
}
public void close() throws IOException {
//nop
}
}