change function definitions

Buffers are no longer wired into any input or translation functions.
They are supplied as arguments through main.

trans.h

@@ -1,12 +1,10 @@
 #ifndef HEADER_TRANS
 #define HEADER_TRANS
 
-#include "input.h"
+int
+encode(unsigned char *op, int olen, unsigned char *sp);
 
-unsigned char *
-encode(unsigned char *op, int np);
-
-unsigned char *
-decode(unsigned char *sp, int *np);
+int
+decode(unsigned char *sp, int slen, unsigned char *op);
 
 #endif