RFR: 8369564: Provide a MemorySegment API to read strings with known lengths [v8]

[Jorn Vernee]

On Fri, 21 Nov 2025 10:38:40 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

>> test/jdk/java/foreign/TestStringEncoding.java line 135:
>> 
>>> 133:         }
>>> 134:     }
>>> 135: 
>> 
>> We need some more tests for the other new methods as well. Also, it would be nice to test non-standard charsets.
>
> I added more tests to cover regular and exception cases for the three new methods. I'm happy to take suggestions on additional test coverage, or if there's a better location for any of the tests.

Thanks, these look great!

I think another test that tests the case where `srcIndex + numChars` overflows for `copy` and `allocateFrom`, with different char sets (one that takes the internal `bytesCompatible == true`, and one that takes the `bytesCompatible == false` route) would be good to have.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/28043#discussion_r2549679121