fix: Need to include zip64 extra field in central directory

[Pr0methean]

No description provided.

[amazon-q-developer]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[amazon-q-developer]

✅ I finished the code review, and left comments with the issues I found. I will now generate code fix suggestions.

[Pr0methean]

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[Pr0methean]

/Gemini help

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[Pr0methean]

@gemini-code-assist How can I fix the failing tests?

[gemini-code-assist]

Hi @Pr0methean, I understand you're looking for help with failing tests. While I don't have direct access to the specific error messages or logs from your CI/CD pipeline, which are usually the best source of information for debugging, I can offer some general guidance based on the changes in this pull request.

To effectively troubleshoot the failing tests, I recommend the following steps:

1. Review CI Logs Thoroughly: The most crucial step is to examine the detailed output from your CI runs. Look for:

   • Error messages and stack traces: These will pinpoint the exact location and nature of the failure.
   • Test names: Identify which specific tests are failing.
   • Environment details: Note the Rust version (MSRV, stable, nightly), feature flags (--no-default-features, --all-features, default features), and operating system (Windows, MacOS, Ubuntu) under which the tests are failing.

2. Reproduce Locally: Try to reproduce the failing tests on your local machine using the same environment (Rust version, features, OS) as the CI. This will allow for faster iteration and debugging.

3. Focus on Changed Areas: Based on the changes in this pull request, the most likely areas to investigate for new test failures are:

   • tests/append_near_4gb.rs: This is a newly added test file, and new tests often expose edge cases or regressions. Pay close attention to the assertions and the data being written/read in these tests, especially test_append_near_4gb and test_append_near_4gb_with_1gb_files, as they deal with large file sizes and ZIP64 boundaries.
   • src/read.rs - parse_extra_field function: The logic for parsing extra fields has been significantly refactored. Any issues in correctly interpreting or preserving these fields (especially ZIP64 extra fields) during reading could lead to validation failures in existing or new tests.
   • src/write.rs - ZIP64 handling: The new logic to force ZIP64 for files starting near the 4GB boundary (if header_start > spec::ZIP64_BYTES_THR) and the explicit writing of zip64_extra_field_block in the central directory header are critical. Ensure these changes correctly generate valid ZIP64 structures that can be read back by the zip crate itself or other ZIP tools.

Remember that the PR description highlights the importance of passing all checks across the 3-dimensional matrix (MSRV/stable/nightly, feature flags, and OS). A failure in one specific combination might indicate an environment-dependent issue or a subtle bug related to feature interactions.

Once you have the specific error messages, you can often narrow down the problem much more quickly. Let me know if you get more details from the CI logs!