AVRO-4294: [c++] Bound allocation when decoding length-prefixed values and collections#3859

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iemejia wants to merge 21 commits into

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iemejia:AVRO-4294-cpp-available-bytes

Commits on Jul 12, 2026

AVRO-4294: [c++] Apply depth guard only to records so deep null returns 0
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AVRO-4294: [c++] Return a conservative 0 minimum at the recursion depth guard
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AVRO-4294: [c++] Avoid null pointer subtraction in StreamReader::remainingBytes
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AVRO-4294: [c++] Cap zero-byte collection element allocation
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AVRO-4294: [c++] Reject INT64_MIN array/map block count
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AVRO-4294: [c++] Always apply structural cap; drop unused vars; cleanups
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AVRO-4294: [c++] Reject negative skip block size; tighten resolving caps
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AVRO-4294: [c++] Reject block count that would truncate on size_t cast
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AVRO-4294: [c++] Grow collections on demand instead of preallocating
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AVRO-4294: [c++] Bounds-check union branch index in selectBranch
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Commits on Jul 13, 2026