SWIG Java - Wrapping unsigned char[] in byte[] -

i want wrap struct containing fixed size array of unsigned char byte[] in java. interface file looks this:

%module example %include "arrays_java.i"  struct mystruct {    unsigned char data[1024];    int len; }; 

the java proxies created contain , set methods take , return short[].

is there way , if yes, easiest way can force swig generate java proxies using byte[] instead of short[]?

i don't want change struct in way. simplified example of large interface have wrap cannot change.

i aware of fact byte in java signed , doesn't cover range of unsigned char in c, passing data around more convenient dealing short[] or wrapper created using array_class defined in carrays.i offers getitem , setitem methods in turn take or return short.

so question if can force swig somehow (maybe typemap) treat unsigned char data[1024] char[1024] in maps byte[] in java.

we can force swig treat unsigned char arrays signed char arrays purpose of swig wrapping using %apply. example using:

%module example %include "arrays_java.i"  %apply signed char[any] { unsigned char[any] };  struct mystruct {    unsigned char data[1024];    int len; }; 

will force happen unsigned char arrays of (known) size. (think of %apply typemap copy , paste)

you write:

%apply signed char[any] { unsigned char data[any] }; 

or:

%apply signed char[any] { unsigned char data[1024] }; 

which apply arrays of type unsigned char of size, or size 1024 respectively.

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as handy tip: figured out typemaps wanted match on %apply calling swig '-debug-tmsearch' flag showed originally:

.... test.i:8: searching suitable 'jni' typemap for: unsigned char data[1024]   looking for: unsigned char data[1024]   looking for: unsigned char [1024]   looking for: unsigned char data[any]   looking for: unsigned char [any]   using: %typemap(jni) unsigned char [any] .... 

which shows typemaps apply in order of precedence every typemap used interface.