[svn-r16223] Modified H5Dset_extent so that it fails when called for compact datasets and contiguous with no external storage

new test program: It adds tests for several ranks, use of fill value or not, compression, different fill value allocation times, use of different storage layouts, and external files

tested: windows, linux

2 files changed, 1707 insertions, 159 deletions

diff --git a/src/H5Dint.c b/src/H5Dint.c
index 3018108..221d448 100644
--- a/src/H5Dint.c
+++ b/src/H5Dint.c
@@ -2294,6 +2294,20 @@ H5D_set_extent(H5D_t *dset, const hsize_t *size, hid_t dxpl_id)
     if(0 == (H5F_INTENT(dset->oloc.file) & H5F_ACC_RDWR))
     HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "no write intent on file")
 
+    /* Check if we are allowed to modify the space; only datasets with chunked and external storage are allowed to be modified */
+    if( H5D_COMPACT == dset->shared->layout.type )
+    {
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "dataset has compact storage")
+    }
+    if( H5D_CONTIGUOUS == dset->shared->layout.type  )
+    {             
+        if( 0 == dset->shared->dcpl_cache.efl.nused)
+        {
+            HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "dataset has contiguous storage")
+        }
+            
+    }
+ 
     /* Check if the filters in the DCPL will need to encode, and if so, can they? */
     if(H5D_check_filters(dset) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't apply filters")
diff --git a/test/set_extent.c b/test/set_extent.c
index 1523015..d680371 100644
--- a/test/set_extent.c
+++ b/test/set_extent.c
@@ -21,12 +21,10 @@
  */
 
 #if 0
-#define H5_SET_EXTENT_DEBUG
+#define H5_SET_EXTENT_DEBUG4
 #endif
 
-#if 0
-#define H5_SET_EXTENT_DEBUG2
-#endif
+
 
 
 #include "hdf5.h"
@@ -34,23 +32,45 @@
 
 /*-------------------------------------------------------------------------
  *
- * Tests the function H5Dset_extent. In the current version of the library
- * the dataset MUST be chunked.
+ * Tests the function H5Dset_extent.
  *
  *-------------------------------------------------------------------------
  */
 
-#define RANK  2
+#define RANK1 1
+#define RANK2 2
+#define RANK3 3
 #define DIM0  4
 #define DIM1  4
+#define DIM2  4
 #define DIMS0 2
 #define DIMS1 2
+#define DIMS2 2
 #define DIME0 7
 #define DIME1 7
+#define DIME2 7
 #define ISTORE_IK  64
 
+static int do_ranks( void );
+static int do_layouts( void );
+
+static int test_rank1( hbool_t do_compress, 
+                       hbool_t do_fill_value, 
+                       hbool_t set_istore_k,
+                       H5D_fill_time_t fill_time);
+static int test_rank2( hbool_t do_compress, 
+                       hbool_t do_fill_value, 
+                       hbool_t set_istore_k,
+                       H5D_fill_time_t fill_time);
+static int test_rank3( hbool_t do_compress, 
+                       hbool_t do_fill_value, 
+                       hbool_t set_istore_k,
+                       H5D_fill_time_t fill_time);
+
+static int test_external( void );
+static int test_layouts( H5D_layout_t layout );
+
 
-static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_k);
 
 
 /*-------------------------------------------------------------------------
@@ -61,19 +81,77 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
 
 int main( void )
 {
+    if ( do_ranks() < 0 )
+    {
+        goto error;
+    } 
+    
+    if ( test_external() < 0 )
+    {
+        goto error;
+    } 
+    
+    if ( do_layouts() < 0 )
+    {
+        goto error;
+    }  
+    
+        
+    puts("All set_extent tests passed.");
+    return 0;
+    
+    
+error:
+  
+    
+    H5_FAILED();
+    return 1;
+}
+
+
+
+/*-------------------------------------------------------------------------
+* test with several ranks
+*-------------------------------------------------------------------------
+*/
+static int do_ranks( void )
+{
+
     hbool_t do_compress = 0;
     hbool_t do_fillvalue = 0;
     hbool_t set_istore_k = 0;
-    
+      
       
     TESTING("with fill value, no compression");
 
     do_fillvalue = 1;
 
-    if (test( do_compress, do_fillvalue, set_istore_k ) < 0)
+    if (test_rank1( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
+    {
+        goto error;
+    } 
+    if (test_rank1( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_IFSET ) < 0)
     {
         goto error;
-    }    
+    } 
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
+    {
+        goto error;
+    } 
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_IFSET ) < 0)
+    {
+        goto error;
+    } 
+    if (test_rank3( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
+    {
+        goto error;
+    } 
+    if (test_rank3( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_IFSET ) < 0)
+    {
+        goto error;
+    } 
+   
+
 
     PASSED();
 
@@ -82,10 +160,19 @@ int main( void )
 
     do_fillvalue = 0;
 
-    if (test( do_compress, do_fillvalue, set_istore_k ) < 0)
+    if (test_rank1( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ERROR  ) < 0)
     {
         goto error;
     }
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ERROR  ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank3( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ERROR  ) < 0)
+    {
+        goto error;
+    }
+   
    
 
     PASSED();
@@ -95,10 +182,29 @@ int main( void )
 #ifdef H5_HAVE_FILTER_DEFLATE
 
     do_compress = 1;
-
     do_fillvalue = 1;
 
-    if (test( do_compress, do_fillvalue, set_istore_k ) < 0)
+    if (test_rank1( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank1( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_IFSET ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_IFSET ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank3( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank3( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_IFSET ) < 0)
     {
         goto error;
     }
@@ -115,7 +221,15 @@ int main( void )
 
     do_fillvalue = 0;
 
-    if (test( do_compress, do_fillvalue, set_istore_k ) < 0)
+    if (test_rank1( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ERROR ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ERROR ) < 0)
+    {
+        goto error;
+    }
+    if (test_rank3( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ERROR ) < 0)
     {
         goto error;
     }
@@ -130,7 +244,7 @@ int main( void )
     do_fillvalue = 1;
     set_istore_k = 1;
 
-    if (test( do_compress, do_fillvalue, set_istore_k ) < 0)
+    if (test_rank2( do_compress, do_fillvalue, set_istore_k, H5D_FILL_TIME_ALLOC ) < 0)
     {
         goto error;
     }
@@ -139,7 +253,6 @@ int main( void )
     PASSED();
    
     
-    puts("All set_extent tests passed.");
     return 0;
     
     
@@ -148,30 +261,61 @@ error:
    
     
     H5_FAILED();
-    return 1;
+    return -1;
 }
 
 
+/*-------------------------------------------------------------------------
+* test with different storage layouts
+*-------------------------------------------------------------------------
+*/
+static int do_layouts( void )
+{
+    
+    TESTING("storage layout use");
+ 
+    if (test_layouts( H5D_COMPACT ) < 0)
+    {
+        goto error;
+    } 
+    
+    if (test_layouts( H5D_CONTIGUOUS ) < 0)
+    {
+        goto error;
+    } 
+    
+    PASSED();
+    
+    return 0;
+    
+error:
+    H5_FAILED();
+    return -1;
+}
+
 
 /*-------------------------------------------------------------------------
- * test
+ * test usage with a 2D rank
  *-------------------------------------------------------------------------
  */
 
-static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_k)
+static int test_rank2( hbool_t do_compress, 
+                       hbool_t do_fill_value, 
+                       hbool_t set_istore_k,
+                       H5D_fill_time_t fill_time)
 {
 
-    hid_t   fid;
+    hid_t   fid;          
     hid_t   did;
     hid_t   sid;
     hid_t   dcpl;
     hid_t   fcpl;
-    hsize_t dims_o[RANK] = {DIM0,DIM1};    
-    hsize_t dims_s[RANK] = {DIMS0,DIMS1};
-    hsize_t dims_e[RANK] = {DIME0,DIME1};
-    hsize_t dims_c[RANK] = {2,2};
-    hsize_t dims_r[RANK];
-    hsize_t maxdims[RANK] = {H5S_UNLIMITED,H5S_UNLIMITED};
+    hsize_t dims_o[RANK2] = {DIM0,DIM1};    /* original dimensions */ 
+    hsize_t dims_s[RANK2] = {DIMS0,DIMS1};  /* shrinking dimensions */ 
+    hsize_t dims_e[RANK2] = {DIME0,DIME1};  /* extended dimensions */ 
+    hsize_t dims_c[RANK2] = {2,2};          /* chunk dimensions */ 
+    hsize_t dims_r[RANK2];                  /* read dimensions */ 
+    hsize_t maxdims[RANK2] = {H5S_UNLIMITED,H5S_UNLIMITED};
     int     buf_o[DIM0][DIM1];
     int     buf_s[DIMS0][DIMS1];
     int     buf_e[DIME0][DIME1];
@@ -189,7 +333,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         comp_value = 0;
     }
 
-      
+        
     for( i = 0; i < DIM0; i++ )
     {
         for( j = 0; j < DIM1; j++ )
@@ -226,7 +370,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     /* create the data space with unlimited dimensions. */
-    if ((sid = H5Screate_simple(RANK, dims_o, maxdims)) < 0) 
+    if ((sid = H5Screate_simple(RANK2, dims_o, maxdims)) < 0) 
     {
         goto error;
     }
@@ -236,7 +380,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     {
         goto error;
     }
-    if (H5Pset_chunk(dcpl, RANK, dims_c) < 0)
+    if (H5Pset_chunk(dcpl, RANK2, dims_c) < 0)
     {
         goto error;
     }
@@ -246,6 +390,11 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         {
             goto error;
         }
+
+        if(H5Pset_fill_time(dcpl, fill_time) < 0) 
+        {
+            goto error;
+        }
     }
     else
     {
@@ -256,7 +405,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         }
         
     }
-    if(do_compress)
+    if (do_compress)
     {
         if(H5Pset_deflate(dcpl, 9) < 0) 
         {
@@ -264,11 +413,15 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         }
     }
     
-    
-    
     /*-------------------------------------------------------------------------
-    * create and write one dataset
-    * data is
+    * Procedure 1
+    * a.	Write an array AxB. These are the dimensions for creating the dataset
+    * b.	Define a greater array CxD where C > A and D > B
+    * c.	Read data back 
+    * d.	Verify if new dimensions are C and D
+    * e.	Verify if data from A to C and B to D is what it is to be expected
+    *
+    * original data is
     *
     *  2 2 2 2
     *  2 2 2 2
@@ -291,7 +444,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     
-#if defined (H5_SET_EXTENT_DEBUG)
+#if defined (H5_SET_EXTENT_DEBUG2)
     printf("\n");
     for (i = 0; i < (int)dims_o[0]; i++ )
     {
@@ -350,7 +503,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     
     
     /* check dimensions */
-    for( i = 0; i < RANK; i++ )
+    for( i = 0; i < RANK2; i++ )
     {
         if (dims_r[i] != dims_e[i]) 
             goto error;
@@ -362,7 +515,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
 
    
     
-#if defined (H5_SET_EXTENT_DEBUG)
+#if defined (H5_SET_EXTENT_DEBUG2)
     printf("\n");
     for (i = 0; i < (int)dims_r[0]; i++ )
     {
@@ -382,7 +535,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     {
         for (j = 0; j < (int)dims_r[1]; j++ )
         {
-            if (i >= DIM0 || j >= DIM1) 
+            if ( i >= DIM0 || j >= DIM1 ) 
             {
                 if(buf_e[i][j] != comp_value) 
                 {
@@ -400,70 +553,16 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     
+  
+    
     /*-------------------------------------------------------------------------
-    * write to the expanded array. fill the space with fill value with other value
-    * data is now, extended space was written
     *
-    *  2 2 2 2 2 2 2
-    *  2 2 2 2 2 2 2
-    *  2 2 2 2 2 2 2
-    *  2 2 2 2 2 2 2
-    *  2 2 2 2 2 2 2
-    *  2 2 2 2 2 2 2
-    *  2 2 2 2 2 2 2
+    * Procedure 2
+    * a.	Define a smaller array ExF where E < A and F < B
+    * b.	Read data back 
+    * c.	Verify if new dimensions are E and F
+    * d.	Verify if data up until E and F is what to be expected
     *
-    *-------------------------------------------------------------------------
-    */
-    
-    for( i = 0; i < DIME0; i++ )
-    {
-        for( j = 0; j < DIME1; j++ )
-        {
-            buf_e[i][j] = 2;
-        }
-    }
-    
-    /* get the space */
-    if ((sid = H5Dget_space(did)) < 0)
-    {
-        goto error;
-    }
-    
-    /* write */
-    if (H5Dwrite(did , H5T_NATIVE_INT, sid, H5S_ALL, H5P_DEFAULT, buf_e) < 0) 
-    {
-        goto error;
-    }
-    
-    /* read */
-    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_e) < 0) 
-        goto error;
-    
-    
-    /* close space */
-    if (H5Sclose(sid) < 0)
-    {
-        goto error;
-    }
-    
-    
-#if defined (H5_SET_EXTENT_DEBUG)
-    printf("\n");
-    for (i = 0; i < (int)dims_r[0]; i++ )
-    {
-        for (j = 0; j < (int)dims_r[1]; j++ )
-        {
-            printf("%d ", buf_e[i][j]);
-        }
-        printf("\n");
-    }
-#endif  
-    
-    
-    
-    
-    /*-------------------------------------------------------------------------
-    * set new dimensions for the array; shrink it
     * data is now
     *
     *  2 2
@@ -496,7 +595,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     /* check dimensions */
-    for( i = 0; i < RANK; i++ )
+    for( i = 0; i < RANK2; i++ )
     {
         if (dims_r[i] != dims_s[i]) 
             goto error;
@@ -543,7 +642,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         goto error;
     }
     
-#if defined (H5_SET_EXTENT_DEBUG)
+#if defined (H5_SET_EXTENT_DEBUG2)
     printf("\n");
     for (i = 0; i < (int)dims_r[0]; i++ )
     {
@@ -565,7 +664,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         {
             if (  buf_s[i][j] != buf_o[i][j] ) 
             {
-                printf("buf_r[%d][%d] = %d\n", i, j, buf_r[i][j]);
+                printf("buf_s[%d][%d] = %d\n", i, j, buf_s[i][j]);
                 printf("buf_o[%d][%d] = %d\n", i, j, buf_o[i][j]);
                 goto error;
             } 
@@ -604,7 +703,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     /* check dimensions */
-    for( i = 0; i < RANK; i++ )
+    for( i = 0; i < RANK2; i++ )
     {
         if (dims_r[i] != dims_o[i]) 
             goto error;
@@ -620,7 +719,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_r) < 0) 
         goto error;
     
-#if defined (H5_SET_EXTENT_DEBUG)
+#if defined (H5_SET_EXTENT_DEBUG2)
     printf("\n");
     for (i = 0; i < (int)dims_r[0]; i++ )
     {
@@ -672,29 +771,703 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     
+   
+    
+    
+     /*-------------------------------------------------------------------------
+    * test a dataset with non initialized chunks
+    *-------------------------------------------------------------------------
+    */
+    
+      
+    if ((sid = H5Screate_simple(RANK2, dims_o, maxdims)) < 0) 
+    {
+        goto error;
+    }
+    if ((did = H5Dcreate2(fid , "dset3", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+    /* set new dimensions for the array */
+    dims_o[ 0 ] = 0;
+    dims_o[ 1 ] = 0;
+    if (H5Dset_extent( did , dims_o ) < 0) 
+    {
+        goto error;
+    }
+
+
+
+    if (H5Dclose(did) < 0) 
+    {
+        goto error;
+    }
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+
+    
+    
+    
+    /*-------------------------------------------------------------------------
+    * close property list
+    *-------------------------------------------------------------------------
+    */
+    
+    
+    if (H5Pclose(dcpl) < 0) 
+    {
+        goto error;
+    }
+
+    if (H5Fclose( fid ) < 0)
+    {
+        goto error;
+    }
+
+
+    return 0;
+    
+    
+    
+error:
+    
+    H5E_BEGIN_TRY 
+    {
+        H5Dclose( did );
+        H5Sclose( sid );
+        H5Pclose( dcpl  );
+        H5Pclose( fcpl  );
+        H5Fclose( fid );
+    } H5E_END_TRY;
+    return -1;
+    
+}
+
+/*-------------------------------------------------------------------------
+ * test usage with a 1D rank
+ *-------------------------------------------------------------------------
+ */
+
+static int test_rank1( hbool_t do_compress, 
+                       hbool_t do_fill_value, 
+                       hbool_t set_istore_k,
+                       H5D_fill_time_t fill_time)
+{
+
+    hid_t   fid;          
+    hid_t   did;
+    hid_t   sid;
+    hid_t   dcpl;
+    hid_t   fcpl;
+    hsize_t dims_o[RANK1] = {DIM0};   /* original dimensions */ 
+    hsize_t dims_s[RANK1] = {DIMS0};  /* shrinking dimensions */ 
+    hsize_t dims_e[RANK1] = {DIME0};  /* extended dimensions */ 
+    hsize_t dims_c[RANK1] = {2};      /* chunk dimensions */ 
+    hsize_t dims_r[RANK1];            /* read dimensions */ 
+    hsize_t maxdims[RANK1] = {H5S_UNLIMITED};
+    int     buf_o[DIM0];
+    int     buf_s[DIMS0];
+    int     buf_e[DIME0];
+    int     buf_r[DIM0];
+    int     i;
+    int     fillvalue = 1; 
+    int     comp_value; 
+       
+    if ( do_fill_value )
+    {
+        comp_value = fillvalue;
+    }
+    else
+    {
+        comp_value = 0;
+    }
+
+        
+    for( i = 0; i < DIM0; i++ )
+    {
+        
+        buf_o[i] = 2;
+    }
+
+    /* create a file creation property list */
+    if ((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0) 
+    {
+        goto error;
+    }
+    
+    if  ( set_istore_k )
+    {
+        /* set non-default indexed storage B-tree internal 'K' value */
+        if (H5Pset_istore_k(fcpl,ISTORE_IK) < 0) 
+        {
+            goto error;
+        }
+        
+    }
+    /* create a new file */
+    if ((fid = H5Fcreate("set_extent1.h5", H5F_ACC_TRUNC, fcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+
+    /* close property list */
+    if(H5Pclose(fcpl) < 0) 
+    {
+        goto error;
+    }
+    
+    /* create the data space with unlimited dimensions. */
+    if ((sid = H5Screate_simple(RANK1, dims_o, maxdims)) < 0) 
+    {
+        goto error;
+    }
+    
+    /* modify dataset creation properties, i.e. enable chunking. */
+    if ((dcpl = H5Pcreate (H5P_DATASET_CREATE)) < 0)
+    {
+        goto error;
+    }
+    if (H5Pset_chunk(dcpl, RANK1, dims_c) < 0)
+    {
+        goto error;
+    }
+    if ( do_fill_value )
+    {
+        if (H5Pset_fill_value(dcpl, H5T_NATIVE_INT, &fillvalue) < 0)
+        {
+            goto error;
+        }
+
+        if(H5Pset_fill_time(dcpl, fill_time) < 0) 
+        {
+            goto error;
+        }
+    }
+    else
+    {
+        
+        if(H5Pset_fill_time(dcpl, H5D_FILL_TIME_ALLOC) < 0) 
+        {
+            goto error;
+        }
+        
+    }
+    if (do_compress)
+    {
+        if(H5Pset_deflate(dcpl, 9) < 0) 
+        {
+            goto error;
+        }
+    }
+    
+    /*-------------------------------------------------------------------------
+    * create, write dataset
+    *-------------------------------------------------------------------------
+    */
+    
+    /* create a dataset */
+    if ((did = H5Dcreate2(fid , "dset1", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+    
+    /* write */
+    if (H5Dwrite(did , H5T_NATIVE_INT, sid, H5S_ALL, H5P_DEFAULT, buf_o) < 0) 
+    {
+        goto error;
+    }
+    
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_o[0]; i++ )
+    {
+        
+        printf("%d ", buf_o[i]);
+        
+    }
+    printf("\n");
+#endif  
+
+
     
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    /*-------------------------------------------------------------------------
+    * set new dimensions for the array; expand it
+    *-------------------------------------------------------------------------
+    */
+    
+    /* set new dimensions for the array. */
+    if (H5Dset_extent(did , dims_e) < 0)
+    {
+        goto error;
+    }
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    
+    /* check dimensions */
+    for( i = 0; i < RANK1; i++ )
+    {
+        if (dims_r[i] != dims_e[i]) 
+            goto error;
+    }
+    
+    /* read */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_e) < 0) 
+        goto error;
+
    
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        
+        printf("%d ", buf_e[i]);
+        
+    }
+    printf("\n");
+#endif  
 
-     /*-------------------------------------------------------------------------
-    * create and write one dataset
-    * data is
-    *
-    *  2 2 2 2
-    *  2 2 2 2
-    *  2 2 2 2
-    *  2 2 2 2
+    
+    
+    
+    /* compare the read array with the expanded array */
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        
+        if ( i >= DIM0  ) 
+        {
+            if(buf_e[i] != comp_value) 
+            {
+                printf("buf_e[%d] = %d\n", i, buf_e[i]);
+                printf("value = %d\n", comp_value);
+                goto error;
+            } 
+        } 
+        else 
+        {
+            if(buf_e[i] != buf_o[i]) 
+                goto error;
+        }
+    }
+    
+    
+  
+    
+    /*-------------------------------------------------------------------------
+    * shrink 
     *
     *-------------------------------------------------------------------------
     */
+    
+    /* set new dimensions for the array. */
+    if (H5Dset_extent(did , dims_s) < 0)
+    {
+        goto error;
+    }
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    /* check dimensions */
+    for( i = 0; i < RANK1; i++ )
+    {
+        if (dims_r[i] != dims_s[i]) 
+            goto error;
+    }
+
+
+
+    /* for this case we close and reopen file */
+    if ( set_istore_k )
+    {
+        
+        if (H5Dclose(did) < 0) 
+        {
+            goto error;
+        }
+        if (H5Fclose(fid) < 0)
+        {
+            goto error;
+        }
+
+        if ((fid = H5Fopen( "set_extent1.h5", H5F_ACC_RDWR, H5P_DEFAULT ))<0) 
+        {
+            goto error;
+        }
+        
+        if ((did = H5Dopen2( fid , "dset1", H5P_DEFAULT ))<0) 
+        {
+            goto error;
+        }
+        
+        
+        
+    }
+    
+    
+    /*-------------------------------------------------------------------------
+    * read
+    *-------------------------------------------------------------------------
+    */
+    
+    /* read */
+    if (H5Dread( did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_s ) < 0) 
+    {
+        goto error;
+    }
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        
+        printf("%d ", buf_s[i]);
+    }
+    printf("\n");
+
+#endif  
 
+
+    
+    
+    /* compare the read array with the shrinked array */
+    for( i = 0; i < (int)dims_r[0]; i++ )
+    {
+        
+        if (  buf_s[i] != buf_o[i] ) 
+        {
+            printf("buf_s[%d] = %d\n", i, buf_s[i]);
+            printf("buf_o[%d] = %d\n", i, buf_o[i]);
+            goto error;
+        } 
+    }
+    
+    
+    /*-------------------------------------------------------------------------
+    * expand it back to original size
+    *-------------------------------------------------------------------------
+    */
+    
+    /* set new dimensions for the array */
+    if (H5Dset_extent(did, dims_o) < 0)
+    {
+        goto error;
+    }
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0) 
+    {
+        goto error;
+    }
+    
+    /* get dimensions. */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0)
+    {
+        goto error;
+    }
+    
+    /* check dimensions */
+    for( i = 0; i < RANK1; i++ )
+    {
+        if (dims_r[i] != dims_o[i]) 
+            goto error;
+    }
+    
+       
+    /* read */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_r) < 0) 
+        goto error;
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        
+        printf("%d ", buf_r[i]);
+        
+    }
+    printf("\n");
+#endif  
+
+
+    
+    /* compare the read array with the original array */
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        
+        if (i >= DIMS0 ) 
+        {
+            if(buf_r[i] != comp_value) 
+            {
+                printf("buf_r[%d] = %d\n", i, buf_r[i] );
+                printf("value = %d\n", comp_value);
+                goto error;
+            } 
+        } 
+        else 
+        {
+            if(buf_r[i] != buf_o[i]) 
+                goto error;
+        }
+    }
+    
+    
+    /*-------------------------------------------------------------------------
+    * close dataset and space
+    *-------------------------------------------------------------------------
+    */
+    
+    if (H5Dclose(did) < 0) 
+    {
+        goto error;
+    }
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    
+   
+    
+    
+     /*-------------------------------------------------------------------------
+    * test a dataset with non initialized chunks
+    *-------------------------------------------------------------------------
+    */
+    
+      
+    if ((sid = H5Screate_simple(RANK1, dims_o, maxdims)) < 0) 
+    {
+        goto error;
+    }
+    if ((did = H5Dcreate2(fid , "dset3", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+    /* set new dimensions for the array */
+    dims_o[ 0 ] = 0;
+    if (H5Dset_extent( did , dims_o ) < 0) 
+    {
+        goto error;
+    }
+
+
+
+    if (H5Dclose(did) < 0) 
+    {
+        goto error;
+    }
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+
+    
+    
+    
+    /*-------------------------------------------------------------------------
+    * close property list
+    *-------------------------------------------------------------------------
+    */
+    
+    
+    if (H5Pclose(dcpl) < 0) 
+    {
+        goto error;
+    }
+
+    if (H5Fclose( fid ) < 0)
+    {
+        goto error;
+    }
+
+
+    return 0;
+    
+    
+    
+error:
+    
+    H5E_BEGIN_TRY 
+    {
+        H5Dclose( did );
+        H5Sclose( sid );
+        H5Pclose( dcpl  );
+        H5Pclose( fcpl  );
+        H5Fclose( fid );
+    } H5E_END_TRY;
+    return -1;
+    
+}
+
+
+/*-------------------------------------------------------------------------
+ * test usage with a 3D rank
+ *-------------------------------------------------------------------------
+ */
+
+static int test_rank3( hbool_t do_compress, 
+                       hbool_t do_fill_value, 
+                       hbool_t set_istore_k,
+                       H5D_fill_time_t fill_time)
+{
+
+    hid_t   fid;          
+    hid_t   did;
+    hid_t   sid;
+    hid_t   dcpl;
+    hid_t   fcpl;
+    hsize_t dims_o[RANK3] = {DIM0,DIM1,DIM2};    /* original dimensions */ 
+    hsize_t dims_s[RANK3] = {DIMS0,DIMS1,DIMS2}; /* shrinking dimensions */ 
+    hsize_t dims_e[RANK3] = {DIME0,DIME1,DIME2}; /* extended dimensions */ 
+    hsize_t dims_c[RANK3] = {2,2,2};             /* chunk dimensions */ 
+    hsize_t dims_r[RANK3];                       /* read dimensions */ 
+    hsize_t maxdims[RANK3] = {H5S_UNLIMITED,H5S_UNLIMITED,H5S_UNLIMITED};
+    int     buf_o[DIM0][DIM1][DIM2];
+    int     buf_s[DIMS0][DIMS1][DIMS2];
+    int     buf_e[DIME0][DIME1][DIME2];
+    int     buf_r[DIM0][DIM1][DIM2];
+    int     i, j, k;
+    int     fillvalue = 1; 
+    int     comp_value; 
+       
+    if ( do_fill_value )
+    {
+        comp_value = fillvalue;
+    }
+    else
+    {
+        comp_value = 0;
+    }
+
+        
+    for( i = 0; i < DIM0; i++ )
+    {
+        for( j = 0; j < DIM1; j++ )
+        {
+            for( k = 0; k < DIM2; k++ )
+            {
+                buf_o[i][j][k] = 2;
+            }
+        }
+    }
+
+    /* create a file creation property list */
+    if ((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0) 
+    {
+        goto error;
+    }
+    
+    if  ( set_istore_k )
+    {
+        /* set non-default indexed storage B-tree internal 'K' value */
+        if (H5Pset_istore_k(fcpl,ISTORE_IK) < 0) 
+        {
+            goto error;
+        }
+        
+    }
+    /* create a new file */
+    if ((fid = H5Fcreate("set_extent1.h5", H5F_ACC_TRUNC, fcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+
+    /* close property list */
+    if(H5Pclose(fcpl) < 0) 
+    {
+        goto error;
+    }
+    
     /* create the data space with unlimited dimensions. */
-    if ((sid = H5Screate_simple(RANK, dims_o, maxdims)) < 0) 
+    if ((sid = H5Screate_simple(RANK3, dims_o, maxdims)) < 0) 
     {
         goto error;
     }
     
+    /* modify dataset creation properties, i.e. enable chunking. */
+    if ((dcpl = H5Pcreate (H5P_DATASET_CREATE)) < 0)
+    {
+        goto error;
+    }
+    if (H5Pset_chunk(dcpl, RANK3, dims_c) < 0)
+    {
+        goto error;
+    }
+    if ( do_fill_value )
+    {
+        if (H5Pset_fill_value(dcpl, H5T_NATIVE_INT, &fillvalue) < 0)
+        {
+            goto error;
+        }
+
+        if(H5Pset_fill_time(dcpl, fill_time) < 0) 
+        {
+            goto error;
+        }
+    }
+    else
+    {
+        
+        if(H5Pset_fill_time(dcpl, H5D_FILL_TIME_ALLOC) < 0) 
+        {
+            goto error;
+        }
+        
+    }
+    if (do_compress)
+    {
+        if(H5Pset_deflate(dcpl, 9) < 0) 
+        {
+            goto error;
+        }
+    }
+    
+    /*-------------------------------------------------------------------------
+    * create, write array
+    *-------------------------------------------------------------------------
+    */
+    
     /* create a dataset */
-    if ((did = H5Dcreate2(fid , "dset2", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
+    if ((did = H5Dcreate2(fid , "dset1", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
     {
         goto error;
     }
@@ -706,16 +1479,22 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     
-#if defined (H5_SET_EXTENT_DEBUG2)
+#if defined (H5_SET_EXTENT_DEBUG3)
     printf("\n");
     for (i = 0; i < (int)dims_o[0]; i++ )
     {
         for (j = 0; j < (int)dims_o[1]; j++ )
         {
-            printf("%d ", buf_o[i][j]);
+            for( k = 0; k < (int)dims_o[2]; k++ )
+            {
+                printf("%d ", buf_o[i][j][k]);
+            }
+            printf("[%d] ", j);
         }
         printf("\n");
+        
     }
+    printf("\n");
 #endif  
 
 
@@ -724,15 +1503,101 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     {
         goto error;
     }
+    
+    /*-------------------------------------------------------------------------
+    * set new dimensions for the array; expand it
+    *
+    *-------------------------------------------------------------------------
+    */
+    
+    /* set new dimensions for the array. */
+    if (H5Dset_extent(did , dims_e) < 0)
+    {
+        goto error;
+    }
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    
+    /* check dimensions */
+    for( i = 0; i < RANK3; i++ )
+    {
+        if (dims_r[i] != dims_e[i]) 
+            goto error;
+    }
+    
+    /* read */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_e) < 0) 
+        goto error;
 
+   
+    
+#if defined (H5_SET_EXTENT_DEBUG3)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            for( k = 0; k < (int)dims_r[2]; k++ )
+            {
+                printf("%d ", buf_e[i][j][k]);
+            }
+            printf("[%d] ", j);
+        }
+        printf("\n");
+        
+    }
+    printf("\n");
+#endif  
 
-      /*-------------------------------------------------------------------------
-    * set new dimensions for the array; shrink it
-    * data is now
-    *
-    *  2 2
-    *  2 2
-    *
+    
+    
+    
+    /* compare the read array with the expanded array */
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            for( k = 0; k < (int)dims_r[2]; k++ )
+            {
+                if ( i >= DIM0 || j >= DIM1 || k >= DIM2 ) 
+                {
+                    if(buf_e[i][j][k] != comp_value) 
+                    {
+                        printf("buf_e[%d][%d][%d] = %d\n", i, j, k, buf_e[i][j][k] );
+                        printf("value = %d\n", comp_value);
+                        goto error;
+                    } 
+                } 
+                else 
+                {
+                    if(buf_e[i][j][k] != buf_o[i][j][k] ) 
+                        goto error;
+                }
+            }
+        }
+    }
+    
+    
+  
+    
+    /*-------------------------------------------------------------------------
+    * shrink
     *-------------------------------------------------------------------------
     */
     
@@ -760,11 +1625,40 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     /* check dimensions */
-    for( i = 0; i < RANK; i++ )
+    for( i = 0; i < RANK3; i++ )
     {
         if (dims_r[i] != dims_s[i]) 
             goto error;
     }
+
+
+
+    /* for this case we close and reopen file */
+    if ( set_istore_k )
+    {
+        
+        if (H5Dclose(did) < 0) 
+        {
+            goto error;
+        }
+        if (H5Fclose(fid) < 0)
+        {
+            goto error;
+        }
+
+        if ((fid = H5Fopen( "set_extent1.h5", H5F_ACC_RDWR, H5P_DEFAULT ))<0) 
+        {
+            goto error;
+        }
+        
+        if ((did = H5Dopen2( fid , "dset1", H5P_DEFAULT ))<0) 
+        {
+            goto error;
+        }
+        
+        
+        
+    }
     
     
     /*-------------------------------------------------------------------------
@@ -778,16 +1672,22 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
         goto error;
     }
     
-#if defined (H5_SET_EXTENT_DEBUG2)
+#if defined (H5_SET_EXTENT_DEBUG3)
     printf("\n");
     for (i = 0; i < (int)dims_r[0]; i++ )
     {
         for (j = 0; j < (int)dims_r[1]; j++ )
         {
-            printf("%d ", buf_s[i][j]);
+            for( k = 0; k < (int)dims_r[2]; k++ )
+            {
+                printf("%d ", buf_s[i][j][k]);
+            }
+             printf("[%d] ", j);
         }
         printf("\n");
+        
     }
+    printf("\n");
 #endif  
 
 
@@ -798,25 +1698,21 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     {
         for( j = 0; j < (int)dims_r[1]; j++ )
         {
-            if (  buf_s[i][j] != buf_o[i][j] ) 
+            for( k = 0; k < (int)dims_r[2]; k++ )
             {
-                printf("buf_r[%d][%d] = %d\n", i, j, buf_r[i][j]);
-                printf("buf_o[%d][%d] = %d\n", i, j, buf_o[i][j]);
-                goto error;
-            } 
+                if (  buf_s[i][j][k] != buf_o[i][j][k] ) 
+                {
+                    printf("buf_s[%d][%d][%d] = %d\n", i, j, k, buf_s[i][j][k] );
+                    printf("buf_o[%d][%d][%d] = %d\n", i, j, k, buf_o[i][j][k] );
+                    goto error;
+                } 
+            }
         }
     }
     
     
     /*-------------------------------------------------------------------------
     * set new dimensions for the array; expand it back to original size
-    * data is now, extended space was initialized with fill value or default value
-    *
-    *  2 2 1 1
-    *  2 2 1 1
-    *  1 1 1 1
-    *  1 1 1 1
-    *
     *-------------------------------------------------------------------------
     */
     
@@ -839,32 +1735,33 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     /* check dimensions */
-    for( i = 0; i < RANK; i++ )
+    for( i = 0; i < RANK3; i++ )
     {
         if (dims_r[i] != dims_o[i]) 
             goto error;
     }
     
-    
-    /*-------------------------------------------------------------------------
-    * read
-    *-------------------------------------------------------------------------
-    */
-    
     /* read */
     if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_r) < 0) 
         goto error;
     
-#if defined (H5_SET_EXTENT_DEBUG2)
+#if defined (H5_SET_EXTENT_DEBUG3)
     printf("\n");
     for (i = 0; i < (int)dims_r[0]; i++ )
     {
         for (j = 0; j < (int)dims_r[1]; j++ )
         {
-            printf("%d ", buf_r[i][j]);
+            for( k = 0; k < (int)dims_r[2]; k++ )
+            {
+                
+                printf("%d ", buf_r[i][j][k]);
+            }
+             printf("[%d] ", j);
         }
         printf("\n");
+        
     }
+    printf("\n");
 #endif  
 
 
@@ -874,19 +1771,22 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     {
         for (j = 0; j < (int)dims_r[1]; j++ )
         {
-            if (i >= DIMS0 || j >= DIMS1) 
+            for( k = 0; k < (int)dims_r[2]; k++ )
             {
-                if(buf_r[i][j] != comp_value) 
+                if (i >= DIMS0 || j >= DIMS1 || k >= DIMS2 ) 
                 {
-                    printf("buf_r[%d][%d] = %d\n", i, j, buf_r[i][j]);
-                    printf("value = %d\n", comp_value);
-                    goto error;
+                    if( buf_r[i][j][k] != comp_value ) 
+                    {
+                        printf("buf_r[%d][%d][%d] = %d\n", i, j, k, buf_r[i][j][k] );
+                        printf("value = %d\n", comp_value);
+                        goto error;
+                    } 
                 } 
-            } 
-            else 
-            {
-                if(buf_r[i][j] != buf_o[i][j]) 
-                    goto error;
+                else 
+                {
+                    if(buf_r[i][j][k] != buf_o[i][j][k]) 
+                        goto error;
+                }
             }
         }
     }
@@ -907,13 +1807,16 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     }
     
     
+   
+    
+    
      /*-------------------------------------------------------------------------
     * test a dataset with non initialized chunks
     *-------------------------------------------------------------------------
     */
     
       
-    if ((sid = H5Screate_simple(RANK, dims_o, maxdims)) < 0) 
+    if ((sid = H5Screate_simple(RANK3, dims_o, maxdims)) < 0) 
     {
         goto error;
     }
@@ -924,6 +1827,7 @@ static int test( hbool_t do_compress, hbool_t do_fill_value, hbool_t set_istore_
     /* set new dimensions for the array */
     dims_o[ 0 ] = 0;
     dims_o[ 1 ] = 0;
+    dims_o[ 2 ] = 0;
     if (H5Dset_extent( did , dims_o ) < 0) 
     {
         goto error;
@@ -979,5 +1883,635 @@ error:
 }
 
 
+/*-------------------------------------------------------------------------
+ * test usage with external storage
+ *-------------------------------------------------------------------------
+ */
+static int test_external()
+{
+
+    hid_t   fid;          
+    hid_t   did;
+    hid_t   sid;
+    hid_t   dcpl;
+    hsize_t dims_o[RANK2] = {DIM0,DIM1};    /* original dimensions */ 
+    hsize_t dims_s[RANK2] = {DIMS0,DIMS1};  /* shrinking dimensions */ 
+    hsize_t dims_e[RANK2] = {DIME0,DIM1};   /* extended dimensions, dimension 1 is the original */ 
+    hsize_t dims_c[RANK2] = {2,2};          /* chunk dimensions */ 
+    hsize_t dims_r[RANK2];                  /* read dimensions */ 
+    hsize_t maxdims[RANK2] = {DIME0,DIM1};  /* only the first dimension can be extendible */
+    int     buf_o[DIM0][DIM1];              /* original buffer, for writing */  
+    int     buf_s[DIMS0][DIMS1];            /* shrinked buffer, for reading */  
+    int     buf_e[DIME0][DIM1];             /* extended buffer, for writing, dimension 1 is the original */    
+    int     buf_ro[DIM0][DIM1];             /* original buffer for reading */    
+    int     i, j;
+    int     comp_value = 0;
+   
+
+    hsize_t size;        /* number of bytes reserved in the file for the data */
+    hsize_t max_size[2];	
+    
+    max_size[0] = dims_e[0];
+    max_size[1] = dims_e[1];
+    size = max_size[0] * max_size[1] * sizeof(int) / 2;
+    
+      
+    for( i = 0; i < DIM0; i++ )
+    {
+        for( j = 0; j < DIM1; j++ )
+        {
+            buf_o[i][j] = 2;
+        }
+    }
+
+    TESTING("external file use");
+  
+    /* create a new file */
+    if ((fid = H5Fcreate("set_extent2.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+  
+    /* modify dataset creation properties */
+    if ((dcpl = H5Pcreate (H5P_DATASET_CREATE)) < 0)
+    {
+        goto error;
+    }
+    
+    if(H5Pset_external(dcpl, "ext1.bin", (off_t)0, size) < 0)
+    {
+        goto error;
+    }
+
+    if(H5Pset_external(dcpl, "ext2.bin", (off_t)0, size) < 0)
+    {
+        goto error;
+    }
+    
+    {
+        
+        char	name[256];		/*external file name		*/
+        off_t	file_offset;    /*external file offset		*/
+        hsize_t	file_size;		/*sizeof external file segment	*/
+        
+        if(H5Pget_external(dcpl, 0, sizeof(name), name, &file_offset,
+            &file_size) < 0) goto error;
+        
+    }
+
+
+
+    /*-------------------------------------------------------------------------
+    * Write an array AxB. These are the dimensions for creating the dataset
+    *
+    * original data is
+    *
+    *  2 2 2 2
+    *  2 2 2 2
+    *  2 2 2 2
+    *  2 2 2 2
+    *
+    *-------------------------------------------------------------------------
+    */
+
+
+    /* create the data space with unlimited dimensions. */
+    if ((sid = H5Screate_simple(RANK2, dims_o, maxdims)) < 0) 
+    {
+        goto error;
+    }
+    if ((did = H5Dcreate2(fid , "dset1", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+    if (H5Dwrite(did , H5T_NATIVE_INT, sid, H5S_ALL, H5P_DEFAULT, buf_o) < 0) 
+    {
+        goto error;
+    }
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+
+
+    /*-------------------------------------------------------------------------
+    * read
+    *-------------------------------------------------------------------------
+    */
+
+     /* read */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_ro) < 0) 
+        goto error;
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_o[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_o[1]; j++ )
+        {
+            printf("%d ", buf_ro[i][j]);
+        }
+        printf("\n");
+    }
+#endif  
+
+
+    
+    /*-------------------------------------------------------------------------
+    * expand
+    *-------------------------------------------------------------------------
+    */
+
+     /*-------------------------------------------------------------------------
+    * set new dimensions for the array; expand it
+    * data is now, extended space was initialized with default value
+    *
+    *  2 2 2 2 
+    *  2 2 2 2 
+    *  2 2 2 2 
+    *  2 2 2 2 
+    *  0 0 0 0 
+    *  0 0 0 0 
+    *  0 0 0 0 
+    *
+    *-------------------------------------------------------------------------
+    */
+
+    /* set new dimensions for the array. */
+    if (H5Dset_extent(did , dims_e) < 0)
+    {
+        goto error;
+    }
+
+     /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    
+    /* check dimensions */
+    for( i = 0; i < RANK2; i++ )
+    {
+        if (dims_r[i] != dims_e[i]) 
+            goto error;
+    }
+    
+    /* read */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_e) < 0) 
+        goto error;
+
+   
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            printf("%d ", buf_e[i][j]);
+        }
+        printf("\n");
+    }
+#endif  
+
+    
+    
+    
+    /* compare the read array with the expanded array */
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            if ( i >= DIM0 || j >= DIM1 ) 
+            {
+                if(buf_e[i][j] != comp_value) 
+                {
+                    printf("buf_e[%d][%d] = %d\n", i, j, buf_e[i][j]);
+                    printf("value = %d\n", comp_value);
+                    goto error;
+                } 
+            } 
+            else 
+            {
+                if(buf_e[i][j] != buf_o[i][j]) 
+                    goto error;
+            }
+        }
+    }
+    
+
+
+     /*-------------------------------------------------------------------------
+    * shrink
+    *
+    * data is now
+    *
+    *  2 2
+    *  2 2
+    *
+    *-------------------------------------------------------------------------
+    */
+    
+    /* set new dimensions for the array. */
+    if (H5Dset_extent(did , dims_s) < 0)
+    {
+        goto error;
+    }
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    /* check dimensions */
+    for( i = 0; i < RANK2; i++ )
+    {
+        if (dims_r[i] != dims_s[i]) 
+            goto error;
+    }
+
+
+    
+    
+    /*-------------------------------------------------------------------------
+    * read
+    *-------------------------------------------------------------------------
+    */
+    
+    /* read */
+    if (H5Dread( did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_s ) < 0) 
+    {
+        goto error;
+    }
+    
+#if defined (H5_SET_EXTENT_DEBUG)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            printf("%d ", buf_s[i][j]);
+        }
+        printf("\n");
+    }
+#endif  
+
+
+    
+    
+    /* compare the read array with the shrinked array */
+    for( i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for( j = 0; j < (int)dims_r[1]; j++ )
+        {
+            if (  buf_s[i][j] != buf_o[i][j] ) 
+            {
+                printf("buf_s[%d][%d] = %d\n", i, j, buf_s[i][j]);
+                printf("buf_o[%d][%d] = %d\n", i, j, buf_o[i][j]);
+                goto error;
+            } 
+        }
+    }
+
+
+    /*-------------------------------------------------------------------------
+    * negative test
+    * try to extend dimension above maximum
+    *-------------------------------------------------------------------------
+    */
+
+
+    dims_e[1] = DIME1;
+
+
+    H5E_BEGIN_TRY 
+    {
+        
+        
+        /* set new dimensions for the array. */
+        if (H5Dset_extent(did , dims_e) == SUCCEED)
+        {
+            goto error;
+        }
+        
+    } H5E_END_TRY;
+
+
+
+    /*-------------------------------------------------------------------------
+    * close property list
+    *-------------------------------------------------------------------------
+    */
+    
+    
+    if (H5Pclose(dcpl) < 0) 
+    {
+        goto error;
+    }
+
+    if (H5Fclose( fid ) < 0)
+    {
+        goto error;
+    }
+
+    PASSED();
+
+
+    return 0;
+    
+    
+    
+error:
+    
+    H5E_BEGIN_TRY 
+    {
+        H5Dclose( did );
+        H5Sclose( sid );
+        H5Pclose( dcpl );
+        H5Fclose( fid );
+    } H5E_END_TRY;
+    return -1;
+    
+}
+
+
+/*-------------------------------------------------------------------------
+ * test usage with layouts compact and contiguous
+ *-------------------------------------------------------------------------
+ */
+static int test_layouts( H5D_layout_t layout )
+{
+
+    hid_t   fid;          
+    hid_t   did;
+    hid_t   sid;
+    hid_t   dcpl;
+    hsize_t dims_o[RANK2] = {DIM0,DIM1};    /* original dimensions */ 
+    hsize_t dims_s[RANK2] = {DIMS0,DIMS1};  /* shrinking dimensions */ 
+    hsize_t dims_e[RANK2] = {DIME0,DIME1};  /* extended dimensions */ 
+    hsize_t dims_c[RANK2] = {2,2};          /* chunk dimensions */ 
+    hsize_t dims_r[RANK2];                  /* read dimensions */ 
+    int     buf_o[DIM0][DIM1];
+    int     buf_r[DIM0][DIM1];
+    int     i, j;    
+   
+    for( i = 0; i < DIM0; i++ )
+    {
+        for( j = 0; j < DIM1; j++ )
+        {
+            buf_o[i][j] = 2;
+        }
+    }
+
+  
+    /* create a new file */
+    if ((fid = H5Fcreate("set_extent3.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+
+    /* create the data space with unlimited dimensions. */
+    if ((sid = H5Screate_simple(RANK2, dims_o, NULL)) < 0) 
+    {
+        goto error;
+    }
+    
+    /* modify dataset creation properties */
+    if ((dcpl = H5Pcreate (H5P_DATASET_CREATE)) < 0)
+    {
+        goto error;
+    }
+    
+    if (H5Pset_layout (dcpl, layout) < 0)
+    {
+        goto error;
+    }
+         
+    /* create a dataset */
+    if ((did = H5Dcreate2(fid , "dset1", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) 
+    {
+        goto error;
+    }
+    
+    /* write */
+    if (H5Dwrite(did , H5T_NATIVE_INT, sid, H5S_ALL, H5P_DEFAULT, buf_o) < 0) 
+    {
+        goto error;
+    }
+    
+    
+#if defined (H5_SET_EXTENT_DEBUG4)
+    printf("\n");
+    for (i = 0; i < (int)dims_o[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_o[1]; j++ )
+        {
+            printf("%d ", buf_o[i][j]);
+        }
+        printf("\n");
+    }
+#endif  
+
+
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    /*-------------------------------------------------------------------------
+    * negative test
+    * try to extend dimension 
+    *-------------------------------------------------------------------------
+    */
+
+    H5E_BEGIN_TRY 
+    {
+     
+        if (H5Dset_extent(did , dims_e) == SUCCEED)
+        {
+            goto error;
+        }
+        
+    } H5E_END_TRY;
+
+    
+  
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    
+    /* check dimensions */
+    for( i = 0; i < RANK2; i++ )
+    {
+        if (dims_r[i] != dims_o[i]) 
+            goto error;
+    }
+    
+    /* read */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_r) < 0) 
+        goto error;
+
+   
+    
+#if defined (H5_SET_EXTENT_DEBUG4)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            printf("%d ", buf_r[i][j]);
+        }
+        printf("\n");
+    }
+#endif  
+
+     
+    
+    /*-------------------------------------------------------------------------
+    * negative test
+    * try to shrink dimension 
+    *-------------------------------------------------------------------------
+    */
+
+    H5E_BEGIN_TRY 
+    {
+     
+        if (H5Dset_extent(did , dims_s) == SUCCEED)
+        {
+            goto error;
+        }
+        
+    } H5E_END_TRY;
+
+    
+    /* get the space */
+    if ((sid = H5Dget_space(did)) < 0)
+    {
+        goto error;
+    }
+    
+    /* get dimensions */
+    if (H5Sget_simple_extent_dims(sid, dims_r, NULL) < 0) 
+    {
+        goto error;
+    }
+    
+    if (H5Sclose(sid) < 0)
+    {
+        goto error;
+    }
+    
+    /* check dimensions */
+    for( i = 0; i < RANK2; i++ )
+    {
+        if (dims_r[i] != dims_o[i]) 
+            goto error;
+    }
+
+    
+    /*-------------------------------------------------------------------------
+    * read
+    *-------------------------------------------------------------------------
+    */
+    
+    /* read */
+    if (H5Dread( did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_r ) < 0) 
+    {
+        goto error;
+    }
+    
+#if defined (H5_SET_EXTENT_DEBUG4)
+    printf("\n");
+    for (i = 0; i < (int)dims_r[0]; i++ )
+    {
+        for (j = 0; j < (int)dims_r[1]; j++ )
+        {
+            printf("%d ", buf_r[i][j]);
+        }
+        printf("\n");
+    }
+#endif  
+
+
+     
+    /*-------------------------------------------------------------------------
+    * close 
+    *-------------------------------------------------------------------------
+    */
+    
+    if (H5Dclose(did) < 0) 
+    {
+        goto error;
+    }
+      
+    if (H5Pclose(dcpl) < 0) 
+    {
+        goto error;
+    }
+
+    if (H5Fclose( fid ) < 0)
+    {
+        goto error;
+    }
+
+
+    return 0;
+    
+    
+    
+error:
+    
+    H5E_BEGIN_TRY 
+    {
+        H5Dclose( did );
+        H5Sclose( sid );
+        H5Pclose( dcpl  );
+        H5Fclose( fid );
+    } H5E_END_TRY;
+    return -1;
+    
+}
+
+