io.undertow.conduits.RangeStreamSinkConduit Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.conduits;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.AbstractStreamSinkConduit;
import org.xnio.conduits.ConduitWritableByteChannel;
import org.xnio.conduits.Conduits;
import org.xnio.conduits.StreamSinkConduit;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* @author Stuart Douglas
*/
public class RangeStreamSinkConduit extends AbstractStreamSinkConduit {
private final long start, end;
private final long originalResponseLength;
private long written;
public RangeStreamSinkConduit(StreamSinkConduit next, long start, long end, long originalResponseLength) {
super(next);
this.start = start;
this.end = end;
this.originalResponseLength = originalResponseLength;
}
@Override
public int write(ByteBuffer src) throws IOException {
boolean currentInclude = written >= start && written <= end;
long bytesRemaining = written < start ? start - written : written <= end ? end - written + 1 : Long.MAX_VALUE;
if (currentInclude) {
int old = src.limit();
src.limit((int) Math.min(src.position() + bytesRemaining, src.limit()));
int written;
int toConsume = 0;
try {
written = super.write(src);
this.written += written;
} finally {
if (!src.hasRemaining()) {
//we wrote everything out
src.limit(old);
if (src.hasRemaining()) {
toConsume = src.remaining();
//but there was still some data that fell outside the range, so we discard it
this.written += toConsume;
src.position(src.limit());
}
} else {
src.limit(old);
}
}
return written + toConsume;
} else {
if (src.remaining() <= bytesRemaining) {
int rem = src.remaining();
this.written += rem;
src.position(src.limit());
return rem;
} else {
this.written += bytesRemaining;
src.position((int) (src.position() + bytesRemaining));
return (int) bytesRemaining + write(src);
}
}
}
@Override
public long write(ByteBuffer[] srcs, int offs, int len) throws IOException {
long ret = 0;
//todo: a more efficent impl
for (int i = offs; i < offs + len; ++i) {
ByteBuffer buf = srcs[i];
if (buf.remaining() > 0) {
ret += write(buf);
if (buf.hasRemaining()) {
return ret;
}
}
}
return ret;
}
@Override
public long transferFrom(StreamSourceChannel source, long count, ByteBuffer throughBuffer) throws IOException {
return IoUtils.transfer(source, count, throughBuffer, new ConduitWritableByteChannel(this));
}
@Override
public long transferFrom(FileChannel src, long position, long count) throws IOException {
return src.transferTo(position, count, new ConduitWritableByteChannel(this));
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
return Conduits.writeFinalBasic(this, srcs, offset, length);
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
return Conduits.writeFinalBasic(this, src);
}
}