[svn-r7904] Purpose:

h5diff new features

Description:
added comparison for attributes
adeded comparison for all dataset datatypes
added tests for the new features
changed the output format

Solution:

Platforms tested:
linux
solaris 5.7
IRIX 6.5 (64)

Misc. update:

1 files changed, 683 insertions, 0 deletions

diff --git a/tools/h5diff/testh5diff_dset.c b/tools/h5diff/testh5diff_dset.c
new file mode 100644
index 0000000..44b2445
--- /dev/null
+++ b/tools/h5diff/testh5diff_dset.c
@@ -0,0 +1,683 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "testh5diff.h"
+
+
+
+/*-------------------------------------------------------------------------
+ * Function: write_dset_in
+ *
+ * Purpose: write datasets in LOC_ID 
+ *
+ * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
+ *
+ * Date: November 12, 2003
+ *
+ *-------------------------------------------------------------------------
+ */
+
+ 
+void write_dset_in(hid_t loc_id, 
+                   const char* dset_name, /* for saving reference to dataset*/
+                   hid_t file_id,
+                   int make_diffs /* flag to modify data buffers */)
+{
+ /* Compound datatype */
+ typedef struct s_t 
+ {
+  char   a;
+  double b;
+ } s_t;
+
+ typedef enum 
+ {
+  RED,
+  GREEN
+ } e_t;
+
+ hid_t   dset_id;
+ hid_t   space_id;  
+ hid_t   type_id;  
+ hid_t   plist_id;
+ herr_t  status;
+ int     val, i, j, k, n;
+ float   f;
+ int     fillvalue=2;
+
+ /* create 1D attributes with dimension [2], 2 elements */
+ hsize_t    dims[1]={2};
+ char       buf1[2][2]= {"ab","de"};        /* string */
+ char       buf2[2]= {1,2};                 /* bitfield, opaque */
+ s_t        buf3[2]= {{1,2},{3,4}};         /* compound */
+ hobj_ref_t buf4[2];                        /* reference */
+ e_t        buf45[2]= {RED,GREEN};          /* enum */
+ hvl_t      buf5[2];                        /* vlen */
+ hsize_t    dimarray[1]={3};                /* array dimension */
+ int        buf6[2][3]= {{1,2,3},{4,5,6}};  /* array */
+ int        buf7[2]= {1,2};                 /* integer */
+ float      buf8[2]= {1,2};                 /* float */
+
+ /* create 2D attributes with dimension [3][2], 6 elements */
+ hsize_t    dims2[2]={3,2};
+ char       buf12[6][2]= {"ab","cd","ef","gh","ij","kl"};         /* string */
+ char       buf22[3][2]= {{1,2},{3,4},{5,6}};                     /* bitfield, opaque */
+ s_t        buf32[6]= {{1,2},{3,4},{5,6},{7,8},{9,10},{11,12}};   /* compound */
+ hobj_ref_t buf42[3][2];                                          /* reference */
+ e_t        buf452[3][2];                                         /* enum */
+ hvl_t      buf52[3][2];                                          /* vlen */
+ int        buf62[6][3]= {{1,2,3},{4,5,6},{7,8,9},{10,11,12},{13,14,15},{16,17,18}};  /* array */
+ int        buf72[3][2]= {{1,2},{3,4},{5,6}};                     /* integer */
+ float      buf82[3][2]= {{1,2},{3,4},{5,6}};                     /* float */
+
+ /* create 3D attributes with dimension [4][3][2], 24 elements */
+ hsize_t    dims3[3]={4,3,2};
+ char       buf13[24][2]= {"ab","cd","ef","gh","ij","kl","mn","pq",
+ "rs","tu","vw","xz","AB","CD","EF","GH",
+ "IJ","KL","MN","PQ","RS","TU","VW","XZ"};  /* string */
+ char       buf23[4][3][2];    /* bitfield, opaque */
+ s_t        buf33[4][3][2];    /* compound */
+ hobj_ref_t buf43[4][3][2];    /* reference */
+ e_t        buf453[4][3][2];   /* enum */
+ hvl_t      buf53[4][3][2];    /* vlen */
+ int        buf63[24][3];      /* array */
+ int        buf73[4][3][2];    /* integer */
+ float      buf83[4][3][2];    /* float */
+
+
+/*-------------------------------------------------------------------------
+ * 1D 
+ *-------------------------------------------------------------------------
+ */
+ 
+/*-------------------------------------------------------------------------
+ * H5T_STRING
+ *-------------------------------------------------------------------------
+ */
+
+ 
+ if (make_diffs)
+ {
+  for (i=0; i<2; i++)
+   for (j=0; j<2; j++)
+   {
+    buf1[i][j]='z'; 
+   }
+ }
+
+
+ type_id = H5Tcopy(H5T_C_S1);
+ status  = H5Tset_size(type_id, 2);
+ write_dset(loc_id,1,dims,"string",type_id,buf1);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_BITFIELD
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  for (i=0; i<2; i++)
+   buf2[i]=buf2[1]=0;
+ }
+
+ type_id = H5Tcopy(H5T_STD_B8LE);
+ write_dset(loc_id,1,dims,"bitfield",type_id,buf2);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_OPAQUE
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  for (i=0; i<2; i++)
+  {
+   buf3[i].a=0; buf3[i].b=0;
+  }
+ }
+
+ type_id = H5Tcreate(H5T_OPAQUE, 1);
+ status = H5Tset_tag(type_id, "1-byte opaque type"); /* must set this */
+ write_dset(loc_id,1,dims,"opaque",type_id,buf2);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_COMPOUND
+ *-------------------------------------------------------------------------
+ */
+
+
+ if (make_diffs)
+ {
+  for (i=0; i<2; i++)
+  {
+   buf45[i]=GREEN; 
+  }
+ }
+
+ type_id = H5Tcreate (H5T_COMPOUND, sizeof(s_t));
+ H5Tinsert(type_id, "a", HOFFSET(s_t, a), H5T_NATIVE_CHAR);
+ H5Tinsert(type_id, "b", HOFFSET(s_t, b), H5T_NATIVE_DOUBLE);
+ write_dset(loc_id,1,dims,"compound",type_id,buf3);
+ status = H5Tclose(type_id);
+ 
+/*-------------------------------------------------------------------------
+ * H5T_REFERENCE
+ *-------------------------------------------------------------------------
+ */
+ /* Create references to dataset */
+ if (dset_name)
+ {
+  status=H5Rcreate(&buf4[0],file_id,dset_name,H5R_OBJECT,-1);
+  status=H5Rcreate(&buf4[1],file_id,dset_name,H5R_OBJECT,-1);
+  write_dset(loc_id,1,dims,"reference",H5T_STD_REF_OBJ,buf4);
+ }
+
+/*-------------------------------------------------------------------------
+ * H5T_ENUM
+ *-------------------------------------------------------------------------
+ */
+ type_id = H5Tcreate(H5T_ENUM, sizeof(e_t));
+ H5Tenum_insert(type_id, "RED",   (val = 0, &val));
+ H5Tenum_insert(type_id, "GREEN", (val = 1, &val));
+ write_dset(loc_id,1,dims,"enum",type_id,buf45);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_VLEN
+ *-------------------------------------------------------------------------
+ */
+ 
+ /* Allocate and initialize VL dataset to write */
+
+ buf5[0].len = 1;
+ buf5[0].p = malloc( 1 * sizeof(int));
+ ((int *)buf5[0].p)[0]=1;
+ buf5[1].len = 2;
+ buf5[1].p = malloc( 2 * sizeof(int));
+ ((int *)buf5[1].p)[0]=2;
+ ((int *)buf5[1].p)[1]=3;
+
+ if (make_diffs)
+ {
+  ((int *)buf5[0].p)[0]=0;
+  ((int *)buf5[1].p)[0]=0;
+  ((int *)buf5[1].p)[1]=0;
+ }
+
+ space_id = H5Screate_simple(1,dims,NULL);
+ type_id = H5Tvlen_create(H5T_NATIVE_INT);
+ dset_id = H5Dcreate(loc_id,"vlen",type_id,space_id,H5P_DEFAULT);
+ status = H5Dwrite(dset_id,type_id,H5S_ALL,H5S_ALL,H5P_DEFAULT,buf5);
+ assert(status>=0);
+ status = H5Dvlen_reclaim(type_id,space_id,H5P_DEFAULT,buf5);
+ assert(status>=0);
+ status = H5Dclose(dset_id);
+ status = H5Tclose(type_id);
+ status = H5Sclose(space_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_ARRAY
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  for (i=0; i<2; i++)
+   for (j=0; j<3; j++)
+   {
+    buf6[i][j]=0; 
+   }
+ }
+
+ type_id = H5Tarray_create(H5T_NATIVE_INT,1,dimarray,NULL);
+ write_dset(loc_id,1,dims,"array",type_id,buf6);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_INTEGER and H5T_FLOAT
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  for (i=0; i<2; i++)
+  {
+   buf7[i]=0; 
+   buf8[i]=0; 
+  }
+ }
+
+ write_dset(loc_id,1,dims,"integer",H5T_NATIVE_INT,buf7);
+ write_dset(loc_id,1,dims,"float",H5T_NATIVE_FLOAT,buf8);
+
+
+/*-------------------------------------------------------------------------
+ * 2D 
+ *-------------------------------------------------------------------------
+ */
+
+/*-------------------------------------------------------------------------
+ * H5T_STRING
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  memset(buf12, 'z', sizeof buf12);
+ }
+
+
+ type_id = H5Tcopy(H5T_C_S1);
+ status  = H5Tset_size(type_id, 2);
+ write_dset(loc_id,2,dims2,"string2D",type_id,buf12);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_BITFIELD
+ *-------------------------------------------------------------------------
+ */
+
+ 
+ if (make_diffs)
+ {
+  memset(buf22,0,sizeof buf22);
+ }
+
+ type_id = H5Tcopy(H5T_STD_B8LE);
+ write_dset(loc_id,2,dims2,"bitfield2D",type_id,buf22);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_OPAQUE
+ *-------------------------------------------------------------------------
+ */
+ type_id = H5Tcreate(H5T_OPAQUE, 1);
+ status = H5Tset_tag(type_id, "1-byte opaque type"); /* must set this */
+ write_dset(loc_id,2,dims2,"opaque2D",type_id,buf22);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_COMPOUND
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  memset(buf32,0,sizeof buf32);
+ }
+
+ type_id = H5Tcreate (H5T_COMPOUND, sizeof(s_t));
+ H5Tinsert(type_id, "a", HOFFSET(s_t, a), H5T_NATIVE_CHAR);
+ H5Tinsert(type_id, "b", HOFFSET(s_t, b), H5T_NATIVE_DOUBLE);
+ write_dset(loc_id,2,dims2,"compound2D",type_id,buf32);
+ status = H5Tclose(type_id);
+ 
+/*-------------------------------------------------------------------------
+ * H5T_REFERENCE
+ *-------------------------------------------------------------------------
+ */
+ /* Create references to dataset */
+ if (dset_name)
+ {
+  for (i = 0; i < 3; i++) {
+   for (j = 0; j < 2; j++) {
+    status=H5Rcreate(&buf42[i][j],file_id,dset_name,H5R_OBJECT,-1);
+   }
+  }
+  write_dset(loc_id,2,dims2,"reference2D",H5T_STD_REF_OBJ,buf42);
+ }
+
+/*-------------------------------------------------------------------------
+ * H5T_ENUM
+ *-------------------------------------------------------------------------
+ */
+
+ for (i=0; i<3; i++)
+  for (j=0; j<2; j++)
+  {
+   if (make_diffs) buf452[i][j]=GREEN; else buf452[i][j]=RED; 
+  }
+
+
+ type_id = H5Tcreate(H5T_ENUM, sizeof(e_t));
+ H5Tenum_insert(type_id, "RED",   (val = 0, &val));
+ H5Tenum_insert(type_id, "GREEN", (val = 1, &val));
+ write_dset(loc_id,2,dims2,"enum2D",type_id,0);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_VLEN
+ *-------------------------------------------------------------------------
+ */
+
+/* Allocate and initialize VL dataset to write */
+ n=0;
+ for (i = 0; i < 3; i++) {
+  for (j = 0; j < 2; j++) {
+    int l;
+    buf52[i][j].p = malloc((i + 1) * sizeof(int));
+    buf52[i][j].len = i + 1;
+    for (l = 0; l < i + 1; l++)
+    if (make_diffs)((int *)buf52[i][j].p)[l] = 0;
+    else ((int *)buf52[i][j].p)[l] = n++;
+  }
+ }
+ 
+ space_id = H5Screate_simple(2,dims2,NULL);
+ type_id = H5Tvlen_create(H5T_NATIVE_INT);
+ dset_id = H5Dcreate(loc_id,"vlen2D",type_id,space_id,H5P_DEFAULT);
+ status = H5Dwrite(dset_id,type_id,H5S_ALL,H5S_ALL,H5P_DEFAULT,buf52);
+ assert(status>=0);
+ status = H5Dvlen_reclaim(type_id,space_id,H5P_DEFAULT,buf52);
+ assert(status>=0);
+ status = H5Dclose(dset_id);
+ status = H5Tclose(type_id);
+ status = H5Sclose(space_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_ARRAY
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  memset(buf62,0,sizeof buf62);
+ }
+
+
+ type_id = H5Tarray_create(H5T_NATIVE_INT,1,dimarray,NULL);
+ write_dset(loc_id,2,dims2,"array2D",type_id,buf62);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_INTEGER, write a fill value
+ *-------------------------------------------------------------------------
+ */
+
+ 
+ if (make_diffs)
+ {
+  memset(buf72,0,sizeof buf72);
+  memset(buf82,0,sizeof buf82);
+ }
+
+
+ plist_id = H5Pcreate(H5P_DATASET_CREATE);
+ status = H5Pset_fill_value(plist_id, H5T_NATIVE_INT, &fillvalue);
+ space_id = H5Screate_simple(2,dims2,NULL);
+ dset_id = H5Dcreate(loc_id,"integer2D",H5T_NATIVE_INT,space_id,plist_id);
+ status = H5Dwrite(dset_id,H5T_NATIVE_INT,H5S_ALL,H5S_ALL,H5P_DEFAULT,buf72);
+ status = H5Pclose(plist_id);
+ status = H5Dclose(dset_id);
+ status = H5Sclose(space_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_FLOAT
+ *-------------------------------------------------------------------------
+ */
+
+ write_dset(loc_id,2,dims2,"float2D",H5T_NATIVE_FLOAT,buf82);
+
+ 
+/*-------------------------------------------------------------------------
+ * 3D 
+ *-------------------------------------------------------------------------
+ */
+
+/*-------------------------------------------------------------------------
+ * H5T_STRING
+ *-------------------------------------------------------------------------
+ */
+
+ if (make_diffs)
+ {
+  memset(buf13,'z',sizeof buf13);
+ }
+
+ type_id = H5Tcopy(H5T_C_S1);
+ status  = H5Tset_size(type_id, 2);
+ write_dset(loc_id,3,dims3,"string3D",type_id,buf13);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_BITFIELD
+ *-------------------------------------------------------------------------
+ */
+
+
+ n=1;
+ for (i = 0; i < 4; i++) {
+  for (j = 0; j < 3; j++) {
+   for (k = 0; k < 2; k++) {
+    if (make_diffs) buf23[i][j][k]=0;
+    else buf23[i][j][k]=n++;
+   }
+  }
+ }
+
+
+ type_id = H5Tcopy(H5T_STD_B8LE);
+ write_dset(loc_id,3,dims3,"bitfield3D",type_id,buf23);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_OPAQUE
+ *-------------------------------------------------------------------------
+ */
+ type_id = H5Tcreate(H5T_OPAQUE, 1);
+ status = H5Tset_tag(type_id, "1-byte opaque type"); /* must set this */
+ write_dset(loc_id,3,dims3,"opaque3D",type_id,buf23);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_COMPOUND
+ *-------------------------------------------------------------------------
+ */
+
+ n=1;
+ for (i = 0; i < 4; i++) {
+  for (j = 0; j < 3; j++) {
+   for (k = 0; k < 2; k++) {
+    if (make_diffs) {
+     buf33[i][j][k].a=0;
+     buf33[i][j][k].b=0;
+    }
+    else {
+     buf33[i][j][k].a=n++;
+     buf33[i][j][k].b=n++;
+    }
+   }
+  }
+ }
+
+
+ type_id = H5Tcreate (H5T_COMPOUND, sizeof(s_t));
+ H5Tinsert(type_id, "a", HOFFSET(s_t, a), H5T_NATIVE_CHAR);
+ H5Tinsert(type_id, "b", HOFFSET(s_t, b), H5T_NATIVE_DOUBLE);
+ write_dset(loc_id,3,dims3,"compound3D",type_id,buf33);
+ status = H5Tclose(type_id);
+ 
+/*-------------------------------------------------------------------------
+ * H5T_REFERENCE
+ *-------------------------------------------------------------------------
+ */
+ /* Create references to dataset */
+ if (dset_name)
+ {
+  for (i = 0; i < 4; i++) {
+   for (j = 0; j < 3; j++) {
+    for (k = 0; k < 2; k++)
+     status=H5Rcreate(&buf43[i][j][k],file_id,dset_name,H5R_OBJECT,-1);
+   }
+  }
+ write_dset(loc_id,3,dims3,"reference3D",H5T_STD_REF_OBJ,buf43);
+ }
+
+/*-------------------------------------------------------------------------
+ * H5T_ENUM
+ *-------------------------------------------------------------------------
+ */
+
+ 
+ for (i = 0; i < 4; i++) {
+  for (j = 0; j < 3; j++) {
+   for (k = 0; k < 2; k++) {
+    if (make_diffs) buf453[i][j][k]=RED; else buf453[i][j][k]=GREEN;
+   }
+  }
+ }
+
+ type_id = H5Tcreate(H5T_ENUM, sizeof(e_t));
+ H5Tenum_insert(type_id, "RED",   (val = 0, &val));
+ H5Tenum_insert(type_id, "GREEN", (val = 1, &val));
+ write_dset(loc_id,3,dims3,"enum3D",type_id,0);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_VLEN
+ *-------------------------------------------------------------------------
+ */
+ 
+ /* Allocate and initialize VL dataset to write */
+ n=0;
+ for (i = 0; i < 4; i++) {
+  for (j = 0; j < 3; j++) {
+   for (k = 0; k < 2; k++) {
+    int l;
+    buf53[i][j][k].p = malloc((i + 1) * sizeof(int));
+    buf53[i][j][k].len = i + 1;
+    for (l = 0; l < i + 1; l++)
+    if (make_diffs)((int *)buf53[i][j][k].p)[l] = 0;
+    else ((int *)buf53[i][j][k].p)[l] = n++;
+   }
+  }
+ }
+ 
+ space_id = H5Screate_simple(3,dims3,NULL);
+ type_id = H5Tvlen_create(H5T_NATIVE_INT);
+ dset_id = H5Dcreate(loc_id,"vlen3D",type_id,space_id,H5P_DEFAULT);
+ status = H5Dwrite(dset_id,type_id,H5S_ALL,H5S_ALL,H5P_DEFAULT,buf53);
+ assert(status>=0);
+ status = H5Dvlen_reclaim(type_id,space_id,H5P_DEFAULT,buf53);
+ assert(status>=0);
+ status = H5Dclose(dset_id);
+ status = H5Tclose(type_id);
+ status = H5Sclose(space_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_ARRAY
+ *-------------------------------------------------------------------------
+ */
+
+
+ n=1;
+ for (i = 0; i < 24; i++) {
+  for (j = 0; j < (int)dimarray[0]; j++) {
+    if (make_diffs) buf63[i][j]=0;
+    else buf63[i][j]=n++;
+  }
+ }
+
+ type_id = H5Tarray_create(H5T_NATIVE_INT,1,dimarray,NULL);
+ write_dset(loc_id,3,dims3,"array3D",type_id,buf63);
+ status = H5Tclose(type_id);
+
+/*-------------------------------------------------------------------------
+ * H5T_INTEGER and H5T_FLOAT
+ *-------------------------------------------------------------------------
+ */
+ n=1; f=1;
+ for (i = 0; i < 4; i++) {
+  for (j = 0; j < 3; j++) {
+   for (k = 0; k < 2; k++) {
+    if (make_diffs) {
+     buf73[i][j][k]=0;
+     buf83[i][j][k]=0;
+    }
+    else {
+     buf73[i][j][k]=n++;
+     buf83[i][j][k]=f++;
+    }
+   }
+  }
+ }
+ write_dset(loc_id,3,dims3,"integer3D",H5T_NATIVE_INT,buf73);
+ write_dset(loc_id,3,dims3,"float3D",H5T_NATIVE_FLOAT,buf83);
+}
+
+
+/*-------------------------------------------------------------------------
+ * Check all HDF5 classes
+ * H5T_INTEGER, H5T_FLOAT
+ * H5T_TIME, H5T_STRING, H5T_BITFIELD, H5T_OPAQUE, H5T_COMPOUND, H5T_REFERENCE,
+ * H5T_ENUM, H5T_VLEN, H5T_ARRAY
+ *-------------------------------------------------------------------------
+ */
+
+ 
+int test_dsetall(const char *file,
+                 int make_diffs /* flag to modify data buffers */)
+{
+ hid_t   file_id; 
+ hid_t   dset_id;
+ hid_t   group_id;
+ hid_t   space_id;
+ hsize_t dims[1]={2};
+ herr_t  status;
+ int     buf[2]={1,2};
+
+ if (make_diffs)
+ {
+  memset(buf,0,sizeof buf);
+ }
+
+ /* Create a file  */
+ if ((file_id  = H5Fcreate(file, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT))<0)
+  return -1;
+
+ /* Create a 1D dataset */
+ space_id = H5Screate_simple(1,dims,NULL);
+ dset_id  = H5Dcreate(file_id,"dset",H5T_NATIVE_INT,space_id,H5P_DEFAULT);
+ status   = H5Dwrite(dset_id,H5T_NATIVE_INT,H5S_ALL,H5S_ALL,H5P_DEFAULT,buf);
+ status   = H5Sclose(space_id);
+ assert(status>=0);
+
+ /* Create a group */
+ group_id  = H5Gcreate(file_id,"g1",0);
+
+/*-------------------------------------------------------------------------
+ * write a series of datasets on the group 
+ *-------------------------------------------------------------------------
+ */
+
+ write_dset_in(group_id,"/dset",file_id,make_diffs);
+
+ /* Close */
+ status = H5Dclose(dset_id);
+ assert(status>=0);
+ status = H5Gclose(group_id);
+ assert(status>=0);
+
+ /* Close file */
+ status = H5Fclose(file_id);
+ assert(status>=0);
+ return status;
+}
+
+
+