Merge MetaIO 2026-07-22 (8c41a1d9): fix #6575 B64/B65/B66

[hjmjohnson]

Updates the vendored MetaIO to upstream Kitware/MetaIO 8c41a1d9 (2026-07-22), landing the fixes for #6575 items B64, B65, and B66. Standard two-parent ThirdParty vendor merge; the diff is MetaIO-only.

Upstream fixes (both merged): Kitware/MetaIO#141 (B64) and Kitware/MetaIO#142 (B65, B66).

Bugs fixed

#	Bug	Upstream
B64	metaImage ElementDataFile = LIST: out-of-range file dimension (LIST -1, LIST NDims) and short slice lists falsely reported success	Kitware/MetaIO#141
B65	M_ReadElements: a compressed image with no CompressedDataSize measured from the start of the file, so a LOCAL image inflated its own ASCII header	Kitware/MetaIO#142
B66	MET_PerformUncompression unconditionally returned true; dest_pos accounting skipped the final inflate, so no byte-count check was possible — both fixed, and both call sites now honour the result	Kitware/MetaIO#142

Upstream added two regression tests, vendored here: testMeta13ImageList.cxx (B64) and testMeta14ImageCompressed.cxx (B65/B66).

Local verification

• Two-parent merge of the 8c41a1d9 MetaIO snapshot into main; diff vs main is MetaIO-only (9 files).
• pre-commit run --all-files clean.
• 83/83 Meta tests pass, including testMeta13ImageList and testMeta14ImageCompressed.

[greptile-apps]

Greptile Summary

Updates the vendored MetaIO snapshot with stricter LIST handling and compressed-data validation.

• Corrects LIST dimension bounds and rejects incomplete file lists.
• Measures omitted compressed-data sizes from the current stream position.
• Propagates decompression failures through MetaImage and MetaArray reads.
• Adjusts the VTK MetaIO target/export symbol configuration.
• Adds regression tests for LIST input and compressed images.

Confidence Score: 3/5

The PR should not merge until decompression success requires a complete zlib stream rather than only the expected output byte count.

A stream that fills the destination exactly can exit through Z_BUF_ERROR without reaching Z_STREAM_END, yet MET_PerformUncompression returns true and both public read paths accept the data.

Modules/ThirdParty/MetaIO/src/MetaIO/src/metaUtils.cxx

T-Rex Logs

What T-Rex did

• A minimal C++ harness was created to reproduce and read the incomplete zlib stream.
• The regression harness executable was compiled successfully and produced for verification.
• Runtime verification showed the incomplete zlib stream was accepted by both decompression paths, producing 4096 bytes with Z_OK and no Z_STREAM_END, and MetaImage::Read exposed the expected pixel values.
• Build and test transcripts were captured, documenting the exact build command, working directory, verbose Ninja invocation, and the passing CTest results.

_{Ran code and verified through T-Rex}

Important Files Changed

Filename	Overview
Modules/ThirdParty/MetaIO/src/MetaIO/src/metaUtils.cxx	Adds output-byte accounting but still permits decompression success without reaching the end of the compressed stream.
Modules/ThirdParty/MetaIO/src/MetaIO/src/metaImage.cxx	Fixes LIST bounds and completeness checks, corrects LOCAL compressed-data positioning, and propagates decompression failure.
Modules/ThirdParty/MetaIO/src/MetaIO/src/metaArray.cxx	Corrects inferred compressed-data positioning and propagates decompression failure.
Modules/ThirdParty/MetaIO/src/MetaIO/src/CMakeLists.txt	Aligns the VTK physical target name and shared-library export symbol with VTK's MetaIO integration.
Modules/ThirdParty/MetaIO/src/MetaIO/src/tests/testMeta13ImageList.cxx	Adds regression coverage for valid, incomplete, and out-of-range LIST inputs.
Modules/ThirdParty/MetaIO/src/MetaIO/src/tests/testMeta14ImageCompressed.cxx	Adds compressed LOCAL and truncation regression coverage, but does not exercise an exact-size stream missing a valid trailer.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[MetaImage or MetaArray read] --> B[Determine compressed input size]
  B --> C[MET_PerformUncompression]
  C --> D{inflate reached Z_STREAM_END?}
  D -->|Yes| E{Produced expected bytes?}
  D -->|No| F[Return failure]
  E -->|Yes| G[Read succeeds]
  E -->|No| F

Loading

_{Reviews (1): Last reviewed commit: "Merge branch 'upstream-MetaIO' into upda..." | Re-trigger Greptile}

[hjmjohnson]

Fixed the ARMBUILD-arm / ITK.Linux failure (itkImageFileReaderManyComponentVectorTest). Root cause: the many-component fixture's compressed stream was truncated — it decompresses to 119 bytes while the header declares 31 MET_FLOAT channels (124 bytes). The old MetaIO silently accepted the short read; the 8c41a1d9 uncompression-result fix in this PR correctly rejects it.

Repointed the content link to a valid re-encoded blob (InsightSoftwareConsortium/ITKTestingData#78, merged) in commit 571c7d9. Verified locally against the mirror-fetched blob: reads exit 0 under this PR's MetaIO build; pre-commit run --all-files clean.

[hjmjohnson]

Upstream fix for the greptile response at Kitware/MetaIO#145. Will need to rebase once that is in place. Merging this as is for now. The upstream is real, but out of scope for clearing the problems identified in 6675.