RFR: 8320971: Use BufferedInputStream.buf directly when param of implTransferTo() is trusted [v18]

[Sergey Tsypanov]

On Sat, 23 Dec 2023 23:18:40 GMT, Markus KARG <duke at openjdk.org> wrote:

>> Yeah, but how could I intercept the argument of OutputStream.write() and check it's identity?
>
> As I wrote earlier today to Vladimir (see above) I actually do not see a solution for this, frankly spoken, as the interceptor would not be trusted. That's why I asked Brian for his ok to keep the test as-is. We need to wait for his judgement, as he is the reviewer, not me (I only try to give initial advice). My comment was more a hint for me to wait for Brian's judgement, less a request to you to fix this.

@bplb are you ok with the current implementation and its test?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16879#discussion_r1437723313