/* DEC.H - Interface to decoding procedures. *//* Copyright (c) 2000, 2001 by Radford M. Neal  * * Permission is granted for anyone to copy, use, or modify this program  * for purposes of research or education, provided this copyright notice  * is retained, and note is made of any changes that have been made.  * * This program is distributed without any warranty, express or implied. * As this program was written for research purposes only, it has not been * tested to the degree that would be advisable in any important application. * All use of this program is entirely at the user's own risk. *//* DECODING METHOD, ITS PARAMETERS, AND OTHER VARIABLES.  The global variables    declared here are located in dec.c. */typedef enum { Enum_block, Enum_bit, Prprp} decoding_method;extern decoding_method dec_method; /* Decoding method to use */extern int table;	/* Trace option, 2 for a table of decoding details */extern int block_no;	/* Number of current block, from zero */extern int max_iter;	/* Maximum number of iteratons of decoding to do */extern char *gen_file;	/* Generator file for Enum_block and Enum_bit *//* PROCEDURES RELATING TO DECODING METHODS. */void enum_decode_setup (void);unsigned enum_decode (double *, char *, double *, int);void prprp_decode_setup (void);unsigned prprp_decode (mod2sparse *, double *, char *, char *, double *);void initprp (mod2sparse *, double *, char *, double *);void iterprp (mod2sparse *, double *, char *, double *);