diff options
Diffstat (limited to 'isoparser/src/main/java/com/coremedia/iso/ChannelHelper.java')
-rw-r--r-- | isoparser/src/main/java/com/coremedia/iso/ChannelHelper.java | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/coremedia/iso/ChannelHelper.java b/isoparser/src/main/java/com/coremedia/iso/ChannelHelper.java new file mode 100644 index 0000000..2ec1d05 --- /dev/null +++ b/isoparser/src/main/java/com/coremedia/iso/ChannelHelper.java @@ -0,0 +1,90 @@ +/* + * 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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