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

[Alan Bateman]

On Wed, 29 Nov 2023 20:07:37 GMT, Vladimir Sitnikov <vsitnikov at openjdk.org> wrote:

> The buffer in question is protected, so any subclass can directly access it. In other words, untrusted code can easily acoess the buffer, and it does not sound fair to add extra overhead to the method which was created for the performance reasons.

If something extends BIS then it has access to the protected fields, this isn't a concern here. Instead, the concern is about passing a reference to the target output stream.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16879#discussion_r1409822279