From 69fb44ec4bf220b8e099148d605172ee1f5c05c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20K=C3=B6lling?=
 <tobias.koelling@physik.uni-muenchen.de>
Date: Thu, 3 Sep 2020 17:51:46 +0200
Subject: [PATCH] added NC_VIRTUAL storage layout

---
 include/netcdf.h      | 1 +
 libhdf5/hdf5open.c    | 4 ++++
 libsrc4/nc4internal.c | 2 ++
 ncdump/ncdump.c       | 3 +++
 4 files changed, 10 insertions(+)

diff --git a/include/netcdf.h b/include/netcdf.h
index 630d1d21b..99bc0c219 100644
--- a/include/netcdf.h
+++ b/include/netcdf.h
@@ -300,6 +300,7 @@ NOTE: The NC_MAX_DIMS, NC_MAX_ATTRS, and NC_MAX_VARS limits
 #define NC_CONTIGUOUS      1
 #define NC_COMPACT         2
 #define NC_UNKNOWN_STORAGE 3
+#define NC_VIRTUAL         4
 /**@}*/
 
 /** In HDF5 files you can set check-summing for each variable.
diff --git a/libhdf5/hdf5open.c b/libhdf5/hdf5open.c
index a87def596..22205fc15 100644
--- a/libhdf5/hdf5open.c
+++ b/libhdf5/hdf5open.c
@@ -1141,6 +1141,10 @@ get_chunking_info(hid_t propid, NC_VAR_INFO_T *var)
     {
 	var->storage = NC_COMPACT;
     }
+    else if (layout == H5D_VIRTUAL)
+    {
+	var->storage = NC_VIRTUAL;
+    }
     else
     {
     var->storage = NC_UNKNOWN_STORAGE;
diff --git a/libsrc4/nc4internal.c b/libsrc4/nc4internal.c
index bc2346cc6..968b2ab08 100644
--- a/libsrc4/nc4internal.c
+++ b/libsrc4/nc4internal.c
@@ -1711,6 +1711,8 @@ rec_print_metadata(NC_GRP_INFO_T *grp, int tab_count)
             strcat(storage_str, "compact");
         else if (var->storage == NC_CHUNKED)
             strcat(storage_str, "chunked");
+        else if (var->storage == NC_VIRTUAL)
+            strcat(storage_str, "virtual");
         else
             strcat(storage_str, "unknown");
         LOG((2, "%s VARIABLE - varid: %d name: %s ndims: %d "
diff --git a/ncdump/ncdump.c b/ncdump/ncdump.c
index b61dac26c..4b2231e3c 100644
--- a/ncdump/ncdump.c
+++ b/ncdump/ncdump.c
@@ -1002,6 +1002,9 @@ pr_att_specials(
 		printf("%lu%s", (unsigned long)chunkp[i], i+1 < varp->ndims ? ", " : " ;\n");
 	    }
 	    free(chunkp);
+    } else if(contig == NC_VIRTUAL) {
+	    pr_att_name(ncid, varp->name, NC_ATT_STORAGE);
+	    printf(" = \"virtual\" ;\n");
     } else {
 	    pr_att_name(ncid, varp->name, NC_ATT_STORAGE);
 	    printf(" = \"unknown\" ;\n");