Fix JPEG image size determination

[kadykov]

Fixes #12530

Changes

• Fixed incorrect handling of non-0xFF blocks in the JPEG image size calculation. Instead of skipping one byte, the entire block is now skipped, improving performance and accuracy.
• Before this change, the code would incorrectly enter and parse non-0xFF blocks, leading to incorrect image size determination. This change ensures that only valid JPEG blocks are processed, skipping unnecessary metadata blocks.

Testing

This change was tested manually by verifying that the image size calculation is accurate for JPEG images with various metadata blocks. No new tests were added, as the existing tests should cover this scenario.

Docs

This change does not affect user behavior, so no documentation updates are required. The fix is internal to the JPEG image size calculation logic and does not introduce any new features or APIs.

[changeset-bot]

🦋 Changeset detected

Latest commit: 6c4ad21

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[codspeed-hq]

CodSpeed Performance Report

Merging #12542 will not alter performance

_{Comparing kadykov:jpeg-size (6c4ad21) with main (cf0d8b0)}

Summary

✅ 6 untouched benchmarks

[Princesseuh]

This folder is a vendored version of image-size (we have not written any of the code in it), I would suggest sending a PR there as well: https://github.com/image-size/image-size

Since the upstream package here is rarely updated, it should be fine to update our copy, though

[Princesseuh]

Code looks great, thank you!