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8273038: ChannelInputStream.transferTo() uses FileChannel.transferTo(FileChannel)

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Reviewed-by: alanb
This commit is contained in:
Markus Karg 2021-09-08 11:22:47 +00:00 • committed by Alan Bateman
parent 6750c34c92
commit 185557423d
4 changed files with 388 additions and 80 deletions
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27
src/java.base/share/classes/sun/nio/ch/ChannelInputStream.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -142,4 +142,29 @@ public class ChannelInputStream
ch.close();
}
@Override
public long transferTo(OutputStream out) throws IOException {
Objects.requireNonNull(out, "out");
if (out instanceof ChannelOutputStream cos
&& ch instanceof FileChannel fc
&& cos.channel() instanceof FileChannel dst) {
return transfer(fc, dst);
}
return super.transferTo(out);
}
private static long transfer(FileChannel src, FileChannel dst) throws IOException {
long initialPos = src.position();
long pos = initialPos;
try {
while (pos < src.size()) {
pos += src.transferTo(pos, Long.MAX_VALUE, dst);
}
} finally {
src.position(pos);
}
return pos - initialPos;
}
}