The compression-level can be set in the range of -1..9, with 6 being
the default compression level. Levels above 6 will have higher
compression rates at the cost of more CPU and memory usage. Levels below
6 will use less CPU and memory at the cost of lower compression rates.
Specifies how much memory should be allocated for the internal compression
state. 1 uses minimum memory but is slow and reduces compression ratio;
9 uses maximum memory for optimal speed. The default value is 8.
Tunes the compression algorithm. Use the value STRATEGYDEFAULT for normal
data, STRATEGYFILTERED for data produced by a filter (or predictor),
STRATEGYHUFFMANONLY to force Huffman encoding only (no string match), or
STRATEGY_RLE to limit match distances to one (run-length encoding).
Base two logarithm of the window size (the size of the history buffer). It
should be in the range 8..15. Larger values result in better compression at
the expense of memory usage. The default value is 15