fnfilter
(LPSTR)fnfilter(G.filename, slide), (LPSTR)methbuf, G.crec.crc32,
char *name = fnfilter(G.filename, slide);
char *fnfilter OF((ZCONST char *raw, uch *space));
#define FnFilter1(fname) fnfilter((fname), slide + (WSIZE>>1))
#define FnFilter2(fname) fnfilter((fname), slide + ((WSIZE>>1) + (WSIZE>>2)))