contrib/zlib/zlib.h

542                                      int  memLevel,
582      The memLevel parameter specifies how much memory should be allocated
583    for the internal compression state.  memLevel=1 uses minimum memory but is
584    slow and reduces compression ratio; memLevel=9 uses maximum memory for
586    as a function of windowBits and memLevel.
1770                                       int windowBits, int memLevel,
1784 #  define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
1785           deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
1798 #  define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
1799           deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\