init_rs — Find a matching or allocate a new rs control structure
struct rs_control * init_rs (int symsize, int gfpoly, int fcr, int prim, int nroots);
symsizethe symbol size (number of bits)
gfpolythe extended Galois field generator polynomial coefficients, with the 0th coefficient in the low order bit. The polynomial must be primitive;
fcrthe first consecutive root of the rs code generator polynomial in index form
primprimitive element to generate polynomial roots
nrootsRS code generator polynomial degree (number of roots)