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138a35df8f
This change fixes some division-by-zero bugs introduced by the optimized ring buffer read/write functions in d8c067966. There are edge cases where decompression can use a length zero ring buffer as the size of the ring buffer used is exactly the the window size specified by a Zstandard frame, and this can be zero. Switching away from loops to mem copies means that we need to ensure ring buffers do not have length zero ring when attempting to read/write from them.