WIP on superfox test progs.

lib/superfox/Makefile

@@ -15,7 +15,7 @@ CFLAGS= -O9 -Wall
 %.o: %.F90
 	${FC} ${FFLAGS} -c $<
 
-all:	rs_sf.a rstest rs_125_49 rst8
+all:	rs_sf.a rstest
 
 OBJS1 = rstest.o ran1.o rs_sf.a
 rstest: $(OBJS1)

lib/superfox/rs_sf.c

@@ -37,17 +37,7 @@ void rs_encode_sf_(int *dgen, int *sent)
   }
 }
 
-void rs_decode_sf_(int *recd, int *era_pos, int *numera, int *decoded,
+void rs_decode_sf_(int *recd, int *era_pos, int *numera, int *nerr)
-		   int *nerr)
-/*
-Decode received data recd[NN], producing decoded[KK]. Positiions of 
-erased symbols are specified in array era_pos[numera]. The number of 
-corrected errors is *nerr; if the data are uncorrectable, *nerr=-1 
-is returned.
-*/
 {
   *nerr=decode_rs_sf(rs_sf,recd,era_pos,*numera);
-  for(int i=0; i<kk; i++) {
-    decoded[i]=recd[nroots+i];
-  }
 }

lib/superfox/rst8.f90

@@ -2,10 +2,11 @@ program rst8
 
   character arg*8
   integer*1 dat0(223)                          !Generated data
-  integer*1 parity(32)                         !Parity symbols
+  integer*1 parsym(32)                         !Parity symbols
   integer*1 cword0(255)                        !Generated codeword
   integer*1 cword(255)    !Rcvd codeword with errors; will be corrected in place
   integer iera(0:200)                          !Positions of additional erasures
+  integer decode_rs_8
       
   nargs=iargc()
   if(nargs.ne.3) then
@@ -37,12 +38,12 @@ program rst8
   write(*,1004) dat0(1:kk)
 1004 format(20i4)
 
-  call encode_rs_8(dat0,parity)                 !Get parity symbols
+  call encode_rs_8(dat0,parsym,npad)                 !Get parity symbols
   cword0(1:kk)=dat0(1:kk)                       !Genetated codeword
-  cword0(kk+1:nn)=parity(1:nn-kk)
+  cword0(kk+1:nn)=parsym(1:nn-kk)
   write(*,1006)
 1006 format(/'Encoded channel symbols')
-  write(*,1002) cword0(1:nn)
+  write(*,1004) cword0(1:nn)
   
   cword=cword0
   do i=1,nerr                                !Introduce errors
@@ -51,18 +52,18 @@ program rst8
   enddo
   write(*,1008) nera
 1008 format(/'Received channel symbols, with',i4,' errors at the end:')
-  write(*,1002) cword(1:nn)
+  write(*,1004) cword(1:nn)
 
   do i=0,nera-1
      iera(i)=i
   enddo
 
-  call decode_rs_8(cword,iera,nera,npad)
+  nfixed=decode_rs_8(cword,iera,nera,npad)
   ibad=count(cword(1:kk).ne.cword0(1:kk))
 
   write(*,1010)
 1010 format(/'Decoded result:')
-  write(*,1002) cword(1:kk)
+  write(*,1004) cword(1:kk)
   maxfix=(nn-kk)/2 + nera/2
   write(*,1100) nerr,nera,nfixed,maxfix
 1100 format(/'nerr:',i3,'   nera:',i3,'   nfixed:',i3,'   maxfix:',i3)

lib/superfox/rstest.f90

@@ -1,11 +1,17 @@
 program rstest
-
+  
   character arg*8
-  integer dgen(235)                          !Generated data, i*4
+  integer dat0(255)                          !Message symbols
-  integer gsym0(255)                         !Encoded data, Karn
+  integer parsym(255)                        !Parity symbols
-  integer gsym(255)                          !Encoded data with errors
+  integer chansym0(255)                      !Encoded data, Karn
+  integer chansym(255)                       !Encoded data with errors
   integer dat(235)                           !Decoded data, i*4
+!  integer, target :: parsym(255)
   integer iera(0:200)                        !Positions of erasures
+  integer gfpoly
+!  type(c_ptr) :: rs
+
+  data gfpoly/z'11d'/
       
   nargs=iargc()
   if(nargs.ne.5) then
@@ -27,41 +33,46 @@ program rstest
   read(arg,*) nera
   call getarg(5,arg)
   read(arg,*) nerr
-  
+
 ! Initialize the Karn codec
   nq=2**mm
   nfz=3
   call rs_init_sf(mm,nq,nn,kk,nfz)             !Initialize the Karn RS codec
 
-! Generate random message, kk symbols with values 0 to nq-1
+! Generate kk message symbols.  (Values must be in  range 0 to nq-1.)
   do i=1,kk
-     dgen(i)=i
+     dat0(i)=i
   enddo
 
-  write(*,1000)
+  write(*,1000) mm,nn,kk,nera,nerr
-1000 format('Generated data symbols, values 0-127:')
+1000 format('M:',i2,'   N:',i4,'   K:',i4,'   nera:',i4,'   nerr:',i4/ &
-  write(*,1002) dgen(1:kk)
+            'Generated data symbols')
+  write(*,1002) dat0(1:kk)
 1002 format(20i4)
 
-  call rs_encode_sf(dgen,gsym0)                 !Encode dgen into gsym0
+  call rs_encode_sf(dat0,parsym)                 !Compute parity symbols
+  chansym0(1:kk)=dat0(1:kk)
+  chansym0(kk+1:nn)=parsym(1:nn-kk)
+
   write(*,1004)
 1004 format(/'Encoded channel symbols')
-  write(*,1002) gsym0(1:nn)
+  write(*,1002) chansym0(1:nn)
   
-  gsym=gsym0
+  chansym=chansym0
   do i=1,nerr                                !Introduce errors
-     gsym(i)=mod(gsym(i)+1,nq)
+     chansym(i)=mod(chansym(i)+1,nq)
   enddo
   write(*,1006) nera
 1006 format(/'Recovered channel symbols, with',i4,' errors at the start:')
-  write(*,1002) gsym(1:nn)
+  write(*,1002) chansym(1:nn)
 
   do i=0,nera-1
      iera(i)=i
   enddo
 
-  call rs_decode_sf(gsym,iera,nera,dat,nfixed)
+  call rs_decode_sf(chansym,iera,nera,nfixed)
-  ibad=count(dat(1:kk).ne.dgen(1:kk))
+  dat(1:kk)=chansym(1:kk)
+  ibad=count(dat(1:kk).ne.dat0(1:kk))
   write(*,1008)
 1008 format(/'Decoded result:')
   write(*,1002) dat(1:kk)

lib/superfox/sfoxtest.f90

@@ -13,7 +13,7 @@ program sfoxtest
   complex cnoise(NMAX)                   !Complex noise
   complex crcvd(NMAX)                    !Signal as received
   integer imsg(KK)                       !Information symbols
-  integer jmsg(KK)                       !Decoded information 
+  integer jmsg(KK)                       !Decoded information
   integer*1 imsg1(7*KK)                  !Copy of imsg in 1-bit i*1 format
   integer idat(NN)                       !Encoded data, 7-bit integers
   integer jdat(NN)                       !Recovered hard-decision symbols

lib/superfox/wrap_rs_8.c

@@ -1,5 +1,9 @@
 #include <stdio.h>
 
+void encode_rs_8(unsigned char *data, unsigned char *parity, int pad);
+
+int decode_rs_8(unsigned char *data, int *eras_pos, int no_eras, int pad);
+
 void encode_rs_8_(unsigned char data[], unsigned char parity[], int *npad)
 {
   encode_rs_8(data,parity,*npad);           //Compute the parity symbols