25434212282
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Ran 06 May 2026 12:24PM UTC

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Build # 25434212282

Build Type

push

github

Committed by

Dead2

Commit Message

Add early return when prev_length already exceeds lookahead

Near end-of-input the caller's prev_length can exceed the
current lookahead, making the chain walk pointless since no
match can be longer than the available input. The non-slow
path never clamped this case — break_matching was slow-path
only — leaving the output contract unguarded.

Together with the existing `if (len >= lookahead)` early
return in the update block — which stops the chain walk as
soon as a match reaches lookahead — this ensures no
unnecessary chain steps are taken. madler/zlib does the full
chain walk when prev_length exceeds lookahead and clamps
best_len at the function exit resulting in extra work.

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