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s2: keep ErrCorrupt when Skip rejects an oversized chunk - #1303
(1) 9fef0a7 — s2.Reader.Skip reported ErrUnsupported instead of ErrCorrupt for an uncompressed chunk larger than the configured maximum block size, while Read reported ErrCorrupt for the same stream. The error guard after ensureBufferSize was inverted: that helper already sets r.err = ErrCorrupt when it returns false, so the inverted condition overwrote it. Match the other three call sites.
Test: TestSkipOversizedChunk in s2/reader_test.go — a short malformed stream with a 65535-byte uncompressed chunk fed to a Reader limited to 1024-byte blocks. It failed with Skip: got s2: unsupported input, want ErrCorrupt before the change; Read already passed.
Summary by CodeRabbit
Bug Fixes
Skipping an oversized or corrupt data chunk now reports the corruption error instead of replacing it with a generic unsupported-operation error. Reading and skipping such chunks consistently return the corruption error when the configured size limit is exceeded. This improves error reporting when handling invalid or unexpectedly large data.
An uncompressed chunk bigger than the configured maximum made Read report ErrCorrupt but Skip report ErrUnsupported, because the error guard was inverted. ensureBufferSize already sets ErrCorrupt; keep it.
Reader.Skip now preserves an existing error when buffer sizing fails. A test verifies that Read and Skip return ErrCorrupt for an oversized uncompressed chunk.
Changes: S2 Reader Error Handling
Layer / File(s)
Summary
Preserve errors in Skip s2/reader.go, s2/reader_test.go
Reader.Skip sets ErrUnsupported only when no error is already present. A test checks that Read and Skip return ErrCorrupt for a 65,535-byte uncompressed chunk when the maximum block size is 1,024 bytes.
The fix preserves the correct error for oversized chunks, with a regression test covering the failure. No merge-blocking issue remains.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Resolution
Docstring Coverage
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Description Check
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Title check
The title "s2: keep ErrCorrupt when Skip rejects an oversized chunk" matches the main change. The diff changes the guard in Reader.Skip so that ErrUnsupported is set only when no error is already pres…
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Out of Scope Changes check
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Full details: Title check
Explanation
The title "s2: keep ErrCorrupt when Skip rejects an oversized chunk" matches the main change. The diff changes the guard in Reader.Skip so that ErrUnsupported is set only when no error is already present, which keeps ErrCorrupt from ensureBufferSize. The added TestSkipOversizedChunk test checks this behavior. The title is specific, concise, and free of file lists or vague wording.
Full details: Docstring Coverage
Explanation
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 2 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Simplify code
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Failed pre-merge checks:
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Write docstrings for the functions missing them to satisfy the coverage
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Reviewing files that changed from the base of the PR and between d8a2412 and 9fef0a7.
Files selected for processing: 2
s2/reader.go
s2/reader_test.go
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(1) 9fef0a7 —
s2.Reader.SkipreportedErrUnsupportedinstead ofErrCorruptfor an uncompressed chunk larger than the configured maximum block size, whileReadreportedErrCorruptfor the same stream. The error guard afterensureBufferSizewas inverted: that helper already setsr.err = ErrCorruptwhen it returns false, so the inverted condition overwrote it. Match the other three call sites.Test:
TestSkipOversizedChunkins2/reader_test.go— a short malformed stream with a 65535-byte uncompressed chunk fed to aReaderlimited to 1024-byte blocks. It failed withSkip: got s2: unsupported input, want ErrCorruptbefore the change;Readalready passed.Summary by CodeRabbit