1 files changed, 53 insertions, 0 deletions
diff --git a/fitsy++/var.C b/fitsy++/var.C
new file mode 100644
index 0000000..4cf1041
--- /dev/null
+++ b/fitsy++/var.C
@@ -0,0 +1,53 @@
+// Copyright (C) 1999-2018
+// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+// For conditions of distribution and use, see copyright notice in "copyright"
+
+#include <tcl.h>
+
+#include "var.h"
+
+FitsVar::FitsVar(Tcl_Interp* interp, const char* var, const char* fn)
+{
+  parse(fn);
+  if (!valid_)
+    return;
+
+  // reset
+  valid_ =0;
+
+  obj = Tcl_GetVar2Ex(interp, (char*)var, NULL, 
+		      TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG);
+  if (!obj)
+    return;
+
+  // just in case
+  Tcl_ConvertToType(interp, obj, Tcl_GetObjType("bytearray"));
+
+  typedef struct ByteArray {
+    int used;			/* The number of bytes used in the byte
+				 * array. */
+    int allocated;		/* The amount of space actually allocated
+				 * minus 1 byte. */
+    unsigned char bytes[4];	/* The array of bytes.  The actual size of
+				 * this field depends on the 'allocated' field
+				 * above. */
+  } ByteArray;
+
+  ByteArray* ba = (ByteArray*)(obj->internalRep.otherValuePtr);
+  mapsize_ = ba->used;
+  mapdata_ = (char*)ba->bytes;
+
+  Tcl_IncrRefCount(obj);
+
+  // so far, so good
+  valid_ = 1;
+}
+
+FitsVar::~FitsVar()
+{
+  if (obj)
+    Tcl_DecrRefCount(obj);
+}
+
+
+