From 42b53f3d80be77d3ff67bdabfce7f8feec375bd0 Mon Sep 17 00:00:00 2001
From: goodale <goodale@eff87b29-5268-4891-90a3-a07138403961>
Date: Fri, 18 Jan 2002 01:49:42 +0000
Subject: Trap attempt to use IOJpeg when maxdim < 3.

Tom


git-svn-id: http://svn.cactuscode.org/arrangements/CactusIO/IOJpeg/trunk@51 eff87b29-5268-4891-90a3-a07138403961
---
 src/GHExtension.c | 34 +++++++++++++++++++---------------
 src/Startup.c     |  7 +++++++
 2 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/src/GHExtension.c b/src/GHExtension.c
index e88d18a..1b65a07 100644
--- a/src/GHExtension.c
+++ b/src/GHExtension.c
@@ -112,26 +112,30 @@ void IOJpeg_SliceCenterSetup(CCTK_ARGUMENTS)
   int numvars;
   IOJpegGeo_t geo_default;
   IOJpegGH *myGH;
+  int extension_handle;
 
+  extension_handle = CCTK_GHExtensionHandle ("IOJpeg");
 
-  myGH = (IOJpegGH *) cctkGH->extensions [CCTK_GHExtensionHandle ("IOJpeg")];
-
-  numvars = CCTK_NumVars ();
-
-  /* Loop over all slab dimension */
-  for (idim = 0; idim < SLABSKEL_MAXDIM; idim++)
+  if(extension_handle >= 0)
   {
-    IOJpeg_DefaultGeo(cctkGH, idim, &geo_default);
+    myGH = (IOJpegGH *) cctkGH->extensions [extension_handle];
+
+    numvars = CCTK_NumVars ();
 
-    /* Set the default HDF5 slab geometry for slab with dimension -idim-*/
-    for (inum = 0; inum < numvars; inum++)
+    /* Loop over all slab dimension */
+    for (idim = 0; idim < SLABSKEL_MAXDIM; idim++)
     {
-      myGH->out_geo[inum][idim] = geo_default;
-      myGH->out_geo[inum][idim].vdim = CCTK_GroupDimFromVarI (inum);
-    }
+      IOJpeg_DefaultGeo(cctkGH, idim, &geo_default);
 
-    /* allocate the flags array for every possible 2D hyperslab */
-    myGH->advertised[idim] = (char *) calloc (numvars, 1);
-  }
+      /* Set the default HDF5 slab geometry for slab with dimension -idim-*/
+      for (inum = 0; inum < numvars; inum++)
+      {
+        myGH->out_geo[inum][idim] = geo_default;
+        myGH->out_geo[inum][idim].vdim = CCTK_GroupDimFromVarI (inum);
+      }
 
+      /* allocate the flags array for every possible 2D hyperslab */
+      myGH->advertised[idim] = (char *) calloc (numvars, 1);
+    }
+  }
 }
diff --git a/src/Startup.c b/src/Startup.c
index e5c19ae..6927697 100644
--- a/src/Startup.c
+++ b/src/Startup.c
@@ -29,6 +29,13 @@ void IOJpeg_Startup (void)
     return;
   }
 
+  if (CCTK_MaxDim() < 3)
+  {
+    CCTK_WARN (1, "IOJpeg: IOJpeg can only currently handle 3D GVs. "
+                  "No IOJpeg IO methods will be enabled.");
+    return;
+  }
+
   IO_GHExtension = CCTK_RegisterGHExtension ("IOJpeg");
   CCTK_RegisterGHExtensionSetupGH (IO_GHExtension, IOJpeg_SetupGH);
   CCTK_RegisterGHExtensionInitGH (IO_GHExtension, IOJpeg_InitGH);
-- 
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