BytesInput.copy(BytesInput) should return a copy not a reference - #3729
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dossett wants to merge 2 commits into
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BytesInput.copy(BytesInput) should return a copy not a reference#3729dossett wants to merge 2 commits into
dossett wants to merge 2 commits into
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dossett
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Aug 17, 2026
| * Zero-copy override: returns the backing array directly when fully used, | ||
| * skipping the base-class BAOS allocation + copy on every decompressor call. | ||
| * Returning the mutable array is safe — the base class already exposes a | ||
| * mutable {@code BAOS.getBuf()}. |
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I think Returning the mutable array is safe is the key. The array was mutable before, but it was a mutable copy of the original array.
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#3565 introduced several optimizations, but I think it also introduced an issue that PR seeks to address. Basically BytesInput.copy(BytesInput) has a public contract to return a copy, but a change to BytesInput.toByteArray() led to returning a reference in some cases. In addition to breaking the public contract, this can lead to data corruption.
See also #3717