ftp.nice.ch/pub/next/unix/archiver/freeze.2.3.N.bs.tar.gz#/freeze/huf.h

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extern u_short freq[];
extern short son[], prnt[];
extern void StartHuff(), init(), write_header(), EncodeChar();
extern void EncodePosition();
#define MAX_FREQ        (u_short)0x8000 /* Tree update timing */

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.