RFR: 8321620: Optimize JImage decompressors

[Glavo]

On Mon, 20 Nov 2023 17:18:11 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> Can we use `Objects::checkIndex` here instead?

No, because these classes need to be compiled with `--release 8`.

Javadoc:


/**
 * @implNote This class needs to maintain JDK 8 source compatibility.
 *
 * It is used internally in the JDK to implement jimage/jrtfs access,
 * but also compiled and delivered as part of the jrtfs.jar to support access
 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
 */

> Is this the correct exception type?

I'm not sure, but I think it shouldn't matter, since the exception is never really thrown here for a valid jimage file.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16556#discussion_r1399536065
PR Review Comment: https://git.openjdk.org/jdk/pull/16556#discussion_r1399538948