[Zlib-devel] stored-block size limit?

[Mark Adler]

On Tuesday, April 9, 2002, at 08:10  AM, Greg Roelofs wrote:
> can you explain why the results of the Z_HUFFMAN_ONLY strategy are 
> (empirically) completely independent of the compression level?

The compression level only affects how hard deflate looks for matching 
strings.  Since Huffman-only doesn't use matching strings at all, the 
compression level has no effect.

memLevel will have an effect on Huffman-only, since it changes the size 
of blocks with the same Huffman codes.  The effect of this is not 
obvious.  Smaller blocks have more relative overhead for the code 
descriptions, but on the other hand they adapt to changing data more 
rapidly, possibly resulting in more optimum code selection.

mark