Initial commit of toolkit SWIG wrapper work

tools/epanet-toolkit/src/epanet_toolkit.i

@@ -0,0 +1,71 @@
+/*
+ *  epanet_toolkit.i - SWIG interface description file for EPANET toolkit
+ * 
+ *  Created:    11/27/2017
+ *  Author:     Michael E. Tryby
+ *              US EPA - ORD/NRMRL
+ *  
+ *  Build command: 
+ *    $ swig -I../../../include -python epanet_toolkit.i
+ *
+*/ 
+
+%module epanet_toolkit
+%{
+#include "epanet2.h"
+
+#define SWIG_FILE_WITH_INIT
+%}
+
+
+/* DEFINE AND TYPEDEF MUST BE INCLUDED */
+typedef void* EN_ProjectHandle;
+
+
+#ifndef DLLEXPORT
+  #ifdef WINDOWS
+    #ifdef __cplusplus
+      #define DLLEXPORT extern "C" __declspec(dllexport)
+    #else
+      #define DLLEXPORT __declspec(dllexport) __stdcall
+    #endif // __cplusplus
+  #elif defined(CYGWIN)
+    #define DLLEXPORT __stdcall
+  #elif defined(__APPLE__)
+    #ifdef __cplusplus
+      #define DLLEXPORT
+    #else
+      #define DLLEXPORT
+    #endif
+  #else
+    #define DLLEXPORT
+  #endif
+#endif
+
+
+/* TYPEMAPS FOR OPAQUE POINTER */
+/* Used for functions that output a new opaque pointer */
+%typemap(in, numinputs=0) EN_ProjectHandle* ph (EN_ProjectHandle retval)
+{
+ /* OUTPUT in */
+    retval = NULL;
+    $1 = &retval;
+}
+/* used for functions that take in an opaque pointer (or NULL)
+and return a (possibly) different pointer */
+%typemap(argout) EN_PorjectHandle* ph
+{
+ /* OUTPUT argout */
+    %append_output(SWIG_NewPointerObj(SWIG_as_voidptr(retval$argnum), $1_descriptor, 0));
+} 
+/* No need for special IN typemap for opaque pointers, it works anyway */
+
+
+/* NO EXCEPTION HANDLING FOR THESE FUNCTIONS */    
+int DLLEXPORT EN_alloc(EN_ProjectHandle* ph);
+int DLLEXPORT EN_open(EN_ProjectHandle ph, char *inpFile, char *rptFile, char *binOutFile);
+int DLLEXPORT EN_solveH(EN_ProjectHandle ph);
+int DLLEXPORT EN_solveQ(EN_ProjectHandle ph);
+int DLLEXPORT EN_report(EN_ProjectHandle ph);
+int DLLEXPORT EN_close(EN_ProjectHandle ph);
+int DLLEXPORT EN_free(EN_ProjectHandle ph);