Description: Cache used by ZopfliFindLongestMatch to remember previously found length/dist
values.
This is needed because the squeeze runs will ask these values multiple times for
the same position.
Uses large amounts of memory, since it has to remember the distance belonging
to every possible shorter-than-the-best length (the so called sublen array).
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File list (Check if you may need any files):
cache.c
cache.h