Fixing incorrectly generated header for `jfif-and-exif.jpg` to support JDK built with `--with-libjpeg=system`.
The test fixture jfif-and-exif.jpg (added by JDK-8160327) currently is a malformed JPEG. Builds that bundle OpenJDK's libjpeg pass because the jdmarker.c leniency patch (JDK-4511441) lets the reader skip the resulting bogus marker and resync. Builds configured --with-libjpeg=system reject it with `javax.imageio.IIOException: Unsupported marker type 0xf7` The core of the issue seems to be a stale test resource, not a product bug. JDK-8351110 later added a guard to the JFIF writer so it can no longer emit a thumbnail that overflows the header length, which confirms the checked-in fixture is invalid. Here I'm regenerating the header correctly and fixing the test size. Testing: * GHA Sanity Checks * Adjusted `JpegExifThumbnailTest.java` test using builds with and without `--with-libjpeg=system` --------- - [X] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - 8396848: JpegExifThumbnailTest.java fails with system libjpeg due to malformed jfif-and-exif.jpg Changes: https://git.openjdk.org/jdk/pull/33759/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33759&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8396848 Stats: 5 lines in 2 files changed: 3 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/33759.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/33759/head:pull/33759 PR: https://git.openjdk.org/jdk/pull/33759
