blockio_read       18 blockio.h      int  blockio_read  (FILE *, char *, int);
blockio_read      137 encode.c           if (blockio_read(srcf,sblk,N-M)==EOF) 
blockio_read       85 extract.c          if (blockio_read(codef,cblk,N)==EOF) break;
blockio_read      155 verify.c           if (blockio_read(codef,cblk,N)==EOF) 
blockio_read      162 verify.c           { if (blockio_read(srcf,sblk,N-M)==EOF)