Pad array writes to the correct number of entries

[Schamper]

Fixes #154

[codspeed-hq]

Merging this PR will improve performance by 11.64%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
✅ 12 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_benchmark_getattr_types	12.1 µs	10.8 µs	+12.49%
⚡	test_benchmark_getattr_constants	11.9 µs	10.8 µs	+10.79%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing fix-array-write (29ceaaa) with main (8fd1506)}

[Copilot]

Pull request overview

This PR addresses issue #154 by ensuring fixed-size array fields (especially trailing arrays in structs) serialize to the full declared size by padding missing entries, and by erroring when writes exceed the declared static size.

Changes:

• Pad static arrays on write when fewer than num_entries elements/characters are provided (base arrays, char[], wchar[]), while raising ArraySizeError on overflow.
• Add/extend tests to validate correct padding behavior and overflow errors for uint8[], char[], and wchar[].
• Fix a spelling typo in structure field-offset comments (“alligned” → “aligned”).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_types_wchar.py	Adds regression tests for wchar[] padding and overflow behavior, including struct end-of-struct array cases.
tests/test_types_char.py	Adds regression tests for char[] padding and overflow behavior, including struct end-of-struct array cases.
tests/test_types_base.py	Adds regression tests for generic array padding on write (primitive and struct element arrays).
dissect/cstruct/types/wchar.py	Pads static wchar[] writes to num_entries, raising ArraySizeError on overflow.
dissect/cstruct/types/char.py	Pads static char[] writes to num_entries, raising ArraySizeError on overflow; broadens _write input types.
dissect/cstruct/types/base.py	Pads static generic arrays to num_entries using element defaults, raising ArraySizeError on overflow.
dissect/cstruct/types/structure.py	Comment spelling correction only.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (8fd1506) to head (29ceaaa).

Files with missing lines	Patch %	Lines
dissect/cstruct/types/char.py	0.00%	8 Missing ⚠️
dissect/cstruct/types/wchar.py	0.00%	5 Missing ⚠️
dissect/cstruct/types/base.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #166   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         22      22           
  Lines       2773    2785   +12     
=====================================
- Misses      2773    2785   +12     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.