GNU Radio 2.x: int.h Source File

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# int.h

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    00001 /* Include file to configure the RS codec for integer symbols
    00002  *
    00003  * Copyright 2002, Phil Karn, KA9Q
    00004  * May be used under the terms of the GNU General Public License (GPL)
    00005  */
    00006 #define DTYPE int
    00007
    00008 /* Reed-Solomon codec control block */
    00009 struct rs {
    00010   unsigned int mm;   /* Bits per symbol */
    00011   unsigned int nn;   /* Symbols per block (= (1<<mm)-1) */
    00012   int *alpha_to;      /* log lookup table */
    00013   int *index_of;      /* Antilog lookup table */
    00014   int *genpoly;       /* Generator polynomial */
    00015   unsigned int nroots;     /* Number of generator roots = number of parity symbols */
    00016   unsigned int fcr;        /* First consecutive root, index form */
    00017   unsigned int prim;       /* Primitive element, index form */
    00018   unsigned int iprim;      /* prim-th root of 1, index form */
    00019 };
    00020
    00021 static inline int modnn(struct rs *rs,int x){
    00022   while (x >= rs->nn) {
    00023     x -= rs->nn;
    00024     x = (x >> rs->mm) + (x & rs->nn);
    00025   }
    00026   return x;
    00027 }
    00028 #define MODNN(x) modnn(rs,x)
    00029
    00030 #define MM (rs->mm)
    00031 #define NN (rs->nn)
    00032 #define ALPHA_TO (rs->alpha_to)
    00033 #define INDEX_OF (rs->index_of)
    00034 #define GENPOLY (rs->genpoly)
    00035 #define NROOTS (rs->nroots)
    00036 #define FCR (rs->fcr)
    00037 #define PRIM (rs->prim)
    00038 #define IPRIM (rs->iprim)
    00039 #define A0 (NN)
    00040
    00041 #define ENCODE_RS encode_rs_int
    00042 #define DECODE_RS decode_rs_int
    00043 #define INIT_RS init_rs_int
    00044 #define FREE_RS free_rs_int
    00045
    00046 void ENCODE_RS(void *p,DTYPE *data,DTYPE *parity);
    00047 int DECODE_RS(void *p,DTYPE *data,int *eras_pos,int no_eras);
    00048 void *INIT_RS(unsigned int symsize,unsigned int gfpoly,unsigned int fcr,
    00049                    unsigned int prim,unsigned int nroots);
    00050 void FREE_RS(void *p);
    00051
    00052
    00053
    00054