Question

I’m trying to create simple DER decoder – console application that just outputs content of given data structure (encoded in DER format, like this one).

I have problems with running this example: A ”Rectangle” Decoder .

I’m trying to compile it with MSVC and I have problems with #include <inttypes.h> and #include <netinet/in.h>. Also type ssize_t is undefined.

Here’s what I’ve done for now:
1. At Online ASN.1 Compiler I pasted this code into textfield:

RectangleModule1 DEFINITIONS ::=
BEGIN

Rectangle ::= SEQUENCE {
    height  INTEGER,
    width   INTEGER
}

END

2. I selected “Use native machine types” and “Generate PER support” options.
3. It “Compiled OK” so I downloaded that output .tgz
4. Created empty project int Visual Studio 2010, drag-n-dropped source files extracted from this .tgz
5. Set additional include directory to “skeletons” directory of ASN1C
6. Tried to build it.

What am I missing?

Any help would be appreciated

Answer 1

The problem is that code generated by ASN1C must be modified in order to compile it with MSVC and to use it in Windows environment.

1. #include <inttypes.h> should be replaced with #define ssize_t SSIZE_T
2. #include <netinet/in.h> should be replaced with #include <Winsock2.h>
3. keyword inline should be removed from static functions defined in asn_internal.h

After that, everything works fine 😉