| /* |
| * 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 |
| } |
| |
| } |
| |
| |
| } |