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/*
* Copyright 2012 Sebastian Annies, 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;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.WritableByteChannel;
import static com.googlecode.mp4parser.util.CastUtils.l2i;
public class ChannelHelper {
public static ByteBuffer readFully(final ReadableByteChannel channel, long size) throws IOException {
if (channel instanceof FileChannel && size > 1024 * 1024) {
ByteBuffer bb = ((FileChannel) channel).map(FileChannel.MapMode.READ_ONLY, ((FileChannel) channel).position(), size);
((FileChannel) channel).position(((FileChannel) channel).position() + size);
return bb;
} else {
ByteBuffer buf = ByteBuffer.allocate(l2i(size));
readFully(channel, buf, buf.limit());
buf.rewind();
assert buf.limit() == size;
return buf;
}
}
public static void readFully(final ReadableByteChannel channel, final ByteBuffer buf)
throws IOException {
readFully(channel, buf, buf.remaining());
}
public static int readFully(final ReadableByteChannel channel, final ByteBuffer buf, final int length)
throws IOException {
int n, count = 0;
while (-1 != (n = channel.read(buf))) {
count += n;
if (count == length) {
break;
}
}
if (n == -1) {
throw new EOFException("End of file. No more boxes.");
}
return count;
}
public static void writeFully(final WritableByteChannel channel, final ByteBuffer buf)
throws IOException {
do {
int written = channel.write(buf);
if (written < 0) {
throw new EOFException();
}
} while (buf.hasRemaining());
}
public static void close(SelectionKey key) {
try {
key.channel().close();
} catch (IOException e) {
// nop
}
}
}
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