RFR: 8320971: Use BufferedInputStream.buf directly when param of implTransferTo() is trusted [v3]

[Alan Bateman]

On Mon, 4 Dec 2023 13:30:02 GMT, Vladimir Sitnikov <vsitnikov at openjdk.org> wrote:

> > it doesn't solve the second part of the concern which is read-only view on the internal buffer.
> 
> I think `ByteBuffer.asReadOnlyBuffer()` should resolve the issues regarding naked byte access. At least `ByteBuffer#array()` returns `null` for read-only buffers, and `ByteBuffer#hasArray()` returns `false`. Am I missing something?

The backing array is not frozen so a read-only view doesn't address the second part of the concern where the target keeps a reference.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16879#discussion_r1413912622