hdf5/test/trefer.c

/****************************************************************************
 * NCSA HDF								                                    *
 * Software Development Group						                        *
 * National Center for Supercomputing Applications			                *
 * University of Illinois at Urbana-Champaign				                *
 * 605 E. Springfield, Champaign IL 61820				                    *
 *									                                        *
 * For conditions of distribution and use, see the accompanying		        *
 * hdf/COPYING file.							                            *
 *									                                        *
 ****************************************************************************/

/* $Id$ */

/***********************************************************
*
* Test program:	 trefer
*
* Test the Reference functionality
*
*************************************************************/

#include "testhdf5.h"

#include "hdf5.h"

#define FILE1   "trefer1.h5"
#define FILE2	"trefer2.h5"
#define FILE3	"trefer3.h5"

/* 1-D dataset with fixed dimensions */
#define SPACE1_NAME  "Space1"
#define SPACE1_RANK	1
#define SPACE1_DIM1	4

/* 2-D dataset with fixed dimensions */
#define SPACE2_NAME  "Space2"
#define SPACE2_RANK	2
#define SPACE2_DIM1	10
#define SPACE2_DIM2	10

/* Element selection information */
#define POINT1_NPOINTS 10

/* Compound datatype */
typedef struct s1_t {
    unsigned int a;
    unsigned int b;
    float c;
} s1_t;


/****************************************************************
**
**  test_reference_obj(): Test basic H5R (reference) object reference code.
**      Tests references to various kinds of objects
** 
****************************************************************/
static void 
test_reference_obj(void)
{
    hid_t		fid1;		/* HDF5 File IDs		*/
    hid_t		dataset,	/* Dataset ID			*/
                dset2;      /* Dereferenced dataset ID */
    hid_t		group;      /* Group ID             */
    hid_t		sid1;       /* Dataspace ID			*/
    hid_t		tid1;       /* Datatype ID			*/
    hsize_t		dims1[] = {SPACE1_DIM1};
    hobj_ref_t      *wbuf,      /* buffer to write to disk */
               *rbuf,       /* buffer read from disk */
               *tbuf;       /* temp. buffer read from disk */
    unsigned      *tu32;      /* Temporary pointer to uint32 data */
    int        i;          /* counting variables */
    const char *write_comment="Foo!"; /* Comments for group */
    char read_comment[10];
    herr_t		ret;		/* Generic return value		*/

    /* Output message about test being performed */
    MESSAGE(5, ("Testing Object Reference Functions\n"));

    /* Allocate write & read buffers */
    wbuf=malloc(MAX(sizeof(unsigned),sizeof(hobj_ref_t))*SPACE1_DIM1);
    rbuf=malloc(MAX(sizeof(unsigned),sizeof(hobj_ref_t))*SPACE1_DIM1);
    tbuf=malloc(MAX(sizeof(unsigned),sizeof(hobj_ref_t))*SPACE1_DIM1);

    /* Create file */
    fid1 = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    CHECK(fid1, FAIL, "H5Fcreate");

    /* Create dataspace for datasets */
    sid1 = H5Screate_simple(SPACE1_RANK, dims1, NULL);
    CHECK(sid1, FAIL, "H5Screate_simple");

    /* Create a group */
    group=H5Gcreate(fid1,"Group1",(size_t)-1);
    CHECK(group, FAIL, "H5Gcreate");

    /* Set group's comment */
    ret=H5Gset_comment(group,".",write_comment);
    CHECK(ret, FAIL, "H5Gset_comment");

    /* Create a dataset (inside Group1) */
    dataset=H5Dcreate(group,"Dataset1",H5T_NATIVE_UINT,sid1,H5P_DEFAULT);
    CHECK(dataset, FAIL, "H5Dcreate");

    for(tu32=(unsigned *)wbuf,i=0; i<SPACE1_DIM1; i++)
        *tu32++=i*3;

    /* Write selection to disk */
    ret=H5Dwrite(dataset,H5T_NATIVE_UINT,H5S_ALL,H5S_ALL,H5P_DEFAULT,wbuf);
    CHECK(ret, FAIL, "H5Dwrite");

    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Create another dataset (inside Group1) */
    dataset=H5Dcreate(group,"Dataset2",H5T_NATIVE_UCHAR,sid1,H5P_DEFAULT);
    CHECK(dataset, FAIL, "H5Dcreate");

    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Create a datatype to refer to */
    tid1 = H5Tcreate (H5T_COMPOUND, sizeof(s1_t));
    CHECK(tid1, FAIL, "H5Tcreate");

    /* Insert fields */
    ret=H5Tinsert (tid1, "a", HOFFSET(s1_t,a), H5T_NATIVE_INT);
    CHECK(ret, FAIL, "H5Tinsert");

    ret=H5Tinsert (tid1, "b", HOFFSET(s1_t,b), H5T_NATIVE_INT);
    CHECK(ret, FAIL, "H5Tinsert");

    ret=H5Tinsert (tid1, "c", HOFFSET(s1_t,c), H5T_NATIVE_FLOAT);
    CHECK(ret, FAIL, "H5Tinsert");

    /* Save datatype for later */
    ret=H5Tcommit (group, "Datatype1", tid1);
    CHECK(ret, FAIL, "H5Tcommit");

    /* Close datatype */
    ret = H5Tclose(tid1);
    CHECK(ret, FAIL, "H5Tclose");

    /* Close group */
    ret = H5Gclose(group);
    CHECK(ret, FAIL, "H5Gclose");

    /* Create a dataset */
    dataset=H5Dcreate(fid1,"Dataset3",H5T_STD_REF_OBJ,sid1,H5P_DEFAULT);
    CHECK(ret, FAIL, "H5Dcreate");

    /* Create reference to dataset */
    ret = H5Rcreate(&wbuf[0],fid1,"/Group1/Dataset1",H5R_OBJECT,-1);
    CHECK(ret, FAIL, "H5Rcreate");
    ret = H5Rget_object_type(dataset,&wbuf[0]);
    VERIFY(ret, H5G_DATASET, "H5Rget_object_type");

    /* Create reference to dataset */
    ret = H5Rcreate(&wbuf[1],fid1,"/Group1/Dataset2",H5R_OBJECT,-1);
    CHECK(ret, FAIL, "H5Rcreate");
    ret = H5Rget_object_type(dataset,&wbuf[1]);
    VERIFY(ret, H5G_DATASET, "H5Rget_object_type");

    /* Create reference to group */
    ret = H5Rcreate(&wbuf[2],fid1,"/Group1",H5R_OBJECT,-1);
    CHECK(ret, FAIL, "H5Rcreate");
    ret = H5Rget_object_type(dataset,&wbuf[2]);
    VERIFY(ret, H5G_GROUP, "H5Rget_object_type");

    /* Create reference to named datatype */
    ret = H5Rcreate(&wbuf[3],fid1,"/Group1/Datatype1",H5R_OBJECT,-1);
    CHECK(ret, FAIL, "H5Rcreate");
    ret = H5Rget_object_type(dataset,&wbuf[3]);
    VERIFY(ret, H5G_TYPE, "H5Rget_object_type");

    /* Write selection to disk */
    ret=H5Dwrite(dataset,H5T_STD_REF_OBJ,H5S_ALL,H5S_ALL,H5P_DEFAULT,wbuf);
    CHECK(ret, FAIL, "H5Dwrite");

    /* Close disk dataspace */
    ret = H5Sclose(sid1);
    CHECK(ret, FAIL, "H5Sclose");
    
    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Close file */
    ret = H5Fclose(fid1);
    CHECK(ret, FAIL, "H5Fclose");

    /* Re-open the file */
    fid1 = H5Fopen(FILE1, H5F_ACC_RDWR, H5P_DEFAULT);
    CHECK(fid1, FAIL, "H5Fopen");

    /* Open the dataset */
    dataset=H5Dopen(fid1,"/Dataset3");
    CHECK(ret, FAIL, "H5Dcreate");

    /* Read selection from disk */
    ret=H5Dread(dataset,H5T_STD_REF_OBJ,H5S_ALL,H5S_ALL,H5P_DEFAULT,rbuf);
    CHECK(ret, FAIL, "H5Dread");

    /* Open dataset object */
    dset2 = H5Rdereference(dataset,H5R_OBJECT,&rbuf[0]);
    CHECK(dset2, FAIL, "H5Rdereference");

    /* Check information in referenced dataset */
    sid1 = H5Dget_space(dset2);
    CHECK(sid1, FAIL, "H5Dget_space");
    
    ret=(int)H5Sget_simple_extent_npoints(sid1);
    VERIFY(ret, 4, "H5Sget_simple_extent_npoints");

    /* Read from disk */
    ret=H5Dread(dset2,H5T_NATIVE_UINT,H5S_ALL,H5S_ALL,H5P_DEFAULT,tbuf);
    CHECK(ret, FAIL, "H5Dread");

    for(tu32=(unsigned *)tbuf,i=0; i<SPACE1_DIM1; i++,tu32++)
        VERIFY(*tu32, (uint32_t)(i*3), "Data");

    /* Close dereferenced Dataset */
    ret = H5Dclose(dset2);
    CHECK(ret, FAIL, "H5Dclose");

    /* Open group object */
    group = H5Rdereference(dataset,H5R_OBJECT,&rbuf[2]);
    CHECK(group, FAIL, "H5Rdereference");

    /* Get group's comment */
    ret=H5Gget_comment(group,".",10,read_comment);
    CHECK(ret, FAIL, "H5Gget_comment");

    /* Check for correct comment value */
    if(HDstrcmp(write_comment,read_comment)!=0) {
        num_errs++;
        MESSAGE(0, ("Error! Incorrect group comment, wanted: %s, got: %s",write_comment,read_comment));
    }

    /* Close group */
    ret = H5Gclose(group);
    CHECK(ret, FAIL, "H5Gclose");

    /* Open datatype object */
    tid1 = H5Rdereference(dataset,H5R_OBJECT,&rbuf[3]);
    CHECK(tid1, FAIL, "H5Rdereference");

    /* Verify correct datatype */
    {
        H5T_class_t tclass;

        tclass= H5Tget_class(tid1);
        VERIFY(tclass, H5T_COMPOUND, "H5Tget_class");

        ret= H5Tget_nmembers(tid1);
        VERIFY(ret, 3, "H5Tget_nmembers");
    }

    /* Close datatype */
    ret = H5Tclose(tid1);
    CHECK(ret, FAIL, "H5Tclose");

    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Close file */
    ret = H5Fclose(fid1);
    CHECK(ret, FAIL, "H5Fclose");

    /* Free memory buffers */
    free(wbuf);
    free(rbuf);
    free(tbuf);
}   /* test_reference_obj() */

/****************************************************************
**
**  test_reference_region(): Test basic H5R (reference) object reference code.
**      Tests references to various kinds of objects
** 
****************************************************************/
static void 
test_reference_region(void)
{
    hid_t		fid1;		/* HDF5 File IDs		*/
    hid_t		dset1,	/* Dataset ID			*/
                dset2;      /* Dereferenced dataset ID */
    hid_t		sid1,       /* Dataspace ID	#1		*/
                sid2;       /* Dataspace ID	#2		*/
    hsize_t		dims1[] = {SPACE1_DIM1},
            	dims2[] = {SPACE2_DIM1, SPACE2_DIM2};
    hssize_t	start[SPACE2_RANK];     /* Starting location of hyperslab */
    hsize_t		stride[SPACE2_RANK];    /* Stride of hyperslab */
    hsize_t		count[SPACE2_RANK];     /* Element count of hyperslab */
    hsize_t		block[SPACE2_RANK];     /* Block size of hyperslab */
    hssize_t	coord1[POINT1_NPOINTS][SPACE2_RANK]; /* Coordinates for point selection */
    hsize_t *   coords;             /* Coordinate buffer */
    hsize_t		low[SPACE2_RANK];   /* Selection bounds */
    hsize_t		high[SPACE2_RANK];     /* Selection bounds */
    hdset_reg_ref_t      *wbuf,      /* buffer to write to disk */
               *rbuf;       /* buffer read from disk */
    uint8_t    *dwbuf,      /* Buffer for writing numeric data to disk */
               *drbuf;      /* Buffer for reading numeric data from disk */
    uint8_t    *tu8;        /* Temporary pointer to uint8 data */
    int        i;          /* counting variables */
    herr_t		ret;		/* Generic return value		*/

    /* Output message about test being performed */
    MESSAGE(5, ("Testing Dataset Region Reference Functions\n"));

    /* Allocate write & read buffers */
    wbuf=calloc(sizeof(hdset_reg_ref_t), SPACE1_DIM1);
    rbuf=malloc(sizeof(hdset_reg_ref_t)*SPACE1_DIM1);
    dwbuf=malloc(sizeof(uint8_t)*SPACE2_DIM1*SPACE2_DIM2);
    drbuf=calloc(sizeof(uint8_t),SPACE2_DIM1*SPACE2_DIM2);

    /* Create file */
    fid1 = H5Fcreate(FILE2, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    CHECK(fid1, FAIL, "H5Fcreate");

    /* Create dataspace for datasets */
    sid2 = H5Screate_simple(SPACE2_RANK, dims2, NULL);
    CHECK(sid2, FAIL, "H5Screate_simple");

    /* Create a dataset */
    dset2=H5Dcreate(fid1,"Dataset2",H5T_STD_U8LE,sid2,H5P_DEFAULT);
    CHECK(dset2, FAIL, "H5Dcreate");

    for(tu8=dwbuf,i=0; i<SPACE2_DIM1*SPACE2_DIM2; i++)
        *tu8++=i*3;

    /* Write selection to disk */
    ret=H5Dwrite(dset2,H5T_STD_U8LE,H5S_ALL,H5S_ALL,H5P_DEFAULT,dwbuf);
    CHECK(ret, FAIL, "H5Dwrite");

    /* Close Dataset */
    ret = H5Dclose(dset2);
    CHECK(ret, FAIL, "H5Dclose");

    /* Create dataspace for the reference dataset */
    sid1 = H5Screate_simple(SPACE1_RANK, dims1, NULL);
    CHECK(sid1, FAIL, "H5Screate_simple");

    /* Create a dataset */
    dset1=H5Dcreate(fid1,"Dataset1",H5T_STD_REF_DSETREG,sid1,H5P_DEFAULT);
    CHECK(ret, FAIL, "H5Dcreate");

    /* Create references */

    /* Select 6x6 hyperslab for first reference */
    start[0]=2; start[1]=2;
    stride[0]=1; stride[1]=1;
    count[0]=1; count[1]=1;
    block[0]=6; block[1]=6;
    ret = H5Sselect_hyperslab(sid2,H5S_SELECT_SET,start,stride,count,block);
    CHECK(ret, FAIL, "H5Sselect_hyperslab");

    ret = (int)H5Sget_select_npoints(sid2);
    VERIFY(ret, 36, "H5Sget_select_npoints");

    /* Store first dataset region */
    ret = H5Rcreate(&wbuf[0],fid1,"/Dataset2",H5R_DATASET_REGION,sid2);
    CHECK(ret, FAIL, "H5Rcreate");

    /* Select sequence of ten points for second reference */
    coord1[0][0]=6; coord1[0][1]=9;
    coord1[1][0]=2; coord1[1][1]=2;
    coord1[2][0]=8; coord1[2][1]=4;
    coord1[3][0]=1; coord1[3][1]=6;
    coord1[4][0]=2; coord1[4][1]=8;
    coord1[5][0]=3; coord1[5][1]=2;
    coord1[6][0]=0; coord1[6][1]=4;
    coord1[7][0]=9; coord1[7][1]=0;
    coord1[8][0]=7; coord1[8][1]=1;
    coord1[9][0]=3; coord1[9][1]=3;
    ret = H5Sselect_elements(sid2,H5S_SELECT_SET,POINT1_NPOINTS,(const hssize_t **)coord1);
    CHECK(ret, FAIL, "H5Sselect_elements");

    ret = (int)H5Sget_select_npoints(sid2);
    VERIFY(ret, 10, "H5Sget_select_npoints");

    /* Store second dataset region */
    ret = H5Rcreate(&wbuf[1],fid1,"/Dataset2",H5R_DATASET_REGION,sid2);
    CHECK(ret, FAIL, "H5Rcreate");

    /* Write selection to disk */
    ret=H5Dwrite(dset1,H5T_STD_REF_DSETREG,H5S_ALL,H5S_ALL,H5P_DEFAULT,wbuf);
    CHECK(ret, FAIL, "H5Dwrite");

    /* Close disk dataspace */
    ret = H5Sclose(sid1);
    CHECK(ret, FAIL, "H5Sclose");
    
    /* Close Dataset */
    ret = H5Dclose(dset1);
    CHECK(ret, FAIL, "H5Dclose");

    /* Close uint8 dataset dataspace */
    ret = H5Sclose(sid2);
    CHECK(ret, FAIL, "H5Sclose");
    
    /* Close file */
    ret = H5Fclose(fid1);
    CHECK(ret, FAIL, "H5Fclose");

    /* Re-open the file */
    fid1 = H5Fopen(FILE2, H5F_ACC_RDWR, H5P_DEFAULT);
    CHECK(fid1, FAIL, "H5Fopen");

    /* Open the dataset */
    dset1=H5Dopen(fid1,"/Dataset1");
    CHECK(dset1, FAIL, "H5Dopen");

    /* Read selection from disk */
    ret=H5Dread(dset1,H5T_STD_REF_DSETREG,H5S_ALL,H5S_ALL,H5P_DEFAULT,rbuf);
    CHECK(ret, FAIL, "H5Dread");

    /* Try to open objects */
    dset2 = H5Rdereference(dset1,H5R_DATASET_REGION,&rbuf[0]);
    CHECK(dset2, FAIL, "H5Rdereference");

    /* Check what H5Rget_object_type function returns */
    ret = H5Rget_object_type(dset1, &rbuf[0]);
    VERIFY(ret, H5G_UNKNOWN, "H5Rget_object_type");

    /* Check information in referenced dataset */
    sid1 = H5Dget_space(dset2);
    CHECK(sid1, FAIL, "H5Dget_space");

    ret=(int)H5Sget_simple_extent_npoints(sid1);
    VERIFY(ret, 100, "H5Sget_simple_extent_npoints");

    /* Read from disk */
    ret=H5Dread(dset2,H5T_STD_U8LE,H5S_ALL,H5S_ALL,H5P_DEFAULT,drbuf);
    CHECK(ret, FAIL, "H5Dread");

    for(tu8=(uint8_t *)drbuf,i=0; i<SPACE2_DIM1*SPACE2_DIM2; i++,tu8++)
        VERIFY(*tu8, (uint8_t)(i*3), "Data");

    /* Get the hyperslab selection */
    sid2=H5Rget_region(dset1,H5R_DATASET_REGION,&rbuf[0]);
    CHECK(sid2, FAIL, "H5Rget_region");

    /* Verify correct hyperslab selected */
    ret = (int)H5Sget_select_npoints(sid2);
    VERIFY(ret, 36, "H5Sget_select_npoints");
    ret = (int)H5Sget_select_hyper_nblocks(sid2);
    VERIFY(ret, 1, "H5Sget_select_hyper_nblocks");
    coords=HDmalloc(ret*SPACE2_RANK*sizeof(hsize_t)*2); /* allocate space for the hyperslab blocks */
    ret = H5Sget_select_hyper_blocklist(sid2,(hsize_t)0,(hsize_t)ret,coords);
    CHECK(ret, FAIL, "H5Sget_select_hyper_blocklist");
    VERIFY(coords[0], 2, "Hyperslab Coordinates");
    VERIFY(coords[1], 2, "Hyperslab Coordinates");
    VERIFY(coords[2], 7, "Hyperslab Coordinates");
    VERIFY(coords[3], 7, "Hyperslab Coordinates");
    HDfree(coords);
    ret = H5Sget_select_bounds(sid2,low,high);
    CHECK(ret, FAIL, "H5Sget_select_bounds");
    VERIFY(low[0], 2, "Selection Bounds");
    VERIFY(low[1], 2, "Selection Bounds");
    VERIFY(high[0], 7, "Selection Bounds");
    VERIFY(high[1], 7, "Selection Bounds");

    /* Close region space */
    ret = H5Sclose(sid2);
    CHECK(ret, FAIL, "H5Sclose");

    /* Get the element selection */
    sid2=H5Rget_region(dset1,H5R_DATASET_REGION,&rbuf[1]);
    CHECK(sid2, FAIL, "H5Rget_region");

    /* Verify correct elements selected */
    ret = (int)H5Sget_select_npoints(sid2);
    VERIFY(ret, 10, "H5Sget_select_npoints");
    ret = (int)H5Sget_select_elem_npoints(sid2);
    VERIFY(ret, 10, "H5Sget_select_elem_npoints");
    coords=HDmalloc(ret*SPACE2_RANK*sizeof(hsize_t)); /* allocate space for the element points */
    ret = H5Sget_select_elem_pointlist(sid2,(hsize_t)0,(hsize_t)ret,coords);
    CHECK(ret, FAIL, "H5Sget_select_elem_pointlist");
    VERIFY((hssize_t)coords[0], coord1[0][0], "Element Coordinates");
    VERIFY((hssize_t)coords[1], coord1[0][1], "Element Coordinates");
    VERIFY((hssize_t)coords[2], coord1[1][0], "Element Coordinates");
    VERIFY((hssize_t)coords[3], coord1[1][1], "Element Coordinates");
    VERIFY((hssize_t)coords[4], coord1[2][0], "Element Coordinates");
    VERIFY((hssize_t)coords[5], coord1[2][1], "Element Coordinates");
    VERIFY((hssize_t)coords[6], coord1[3][0], "Element Coordinates");
    VERIFY((hssize_t)coords[7], coord1[3][1], "Element Coordinates");
    VERIFY((hssize_t)coords[8], coord1[4][0], "Element Coordinates");
    VERIFY((hssize_t)coords[9], coord1[4][1], "Element Coordinates");
    VERIFY((hssize_t)coords[10], coord1[5][0], "Element Coordinates");
    VERIFY((hssize_t)coords[11], coord1[5][1], "Element Coordinates");
    VERIFY((hssize_t)coords[12], coord1[6][0], "Element Coordinates");
    VERIFY((hssize_t)coords[13], coord1[6][1], "Element Coordinates");
    VERIFY((hssize_t)coords[14], coord1[7][0], "Element Coordinates");
    VERIFY((hssize_t)coords[15], coord1[7][1], "Element Coordinates");
    VERIFY((hssize_t)coords[16], coord1[8][0], "Element Coordinates");
    VERIFY((hssize_t)coords[17], coord1[8][1], "Element Coordinates");
    VERIFY((hssize_t)coords[18], coord1[9][0], "Element Coordinates");
    VERIFY((hssize_t)coords[19], coord1[9][1], "Element Coordinates");
    HDfree(coords);
    ret = H5Sget_select_bounds(sid2,low,high);
    CHECK(ret, FAIL, "H5Sget_select_bounds");
    VERIFY(low[0], 0, "Selection Bounds");
    VERIFY(low[1], 0, "Selection Bounds");
    VERIFY(high[0], 9, "Selection Bounds");
    VERIFY(high[1], 9, "Selection Bounds");

    /* Close region space */
    ret = H5Sclose(sid2);
    CHECK(ret, FAIL, "H5Sclose");

    /* Close first space */
    ret = H5Sclose(sid1);
    CHECK(ret, FAIL, "H5Sclose");

    /* Close dereferenced Dataset */
    ret = H5Dclose(dset2);
    CHECK(ret, FAIL, "H5Dclose");

    /* Close Dataset */
    ret = H5Dclose(dset1);
    CHECK(ret, FAIL, "H5Dclose");

    /* Close file */
    ret = H5Fclose(fid1);
    CHECK(ret, FAIL, "H5Fclose");

    /* Free memory buffers */
    free(wbuf);
    free(rbuf);
    free(dwbuf);
    free(drbuf);
}   /* test_reference_region() */

/****************************************************************
**
**  test_reference_obj_deleted(): Test H5R (reference) object reference code.
**      Tests for correct failures for deleted and non-existent objects
** 
****************************************************************/
static void 
test_reference_obj_deleted(void)
{
    hid_t		fid1;		/* HDF5 File IDs		*/
    hid_t		dataset,	/* Dataset ID			*/
                dset2;      /* Dereferenced dataset ID */
    hid_t		sid1;       /* Dataspace ID			*/
    hobj_ref_t  oref;       /* Object Reference to test */
    herr_t		ret;		/* Generic return value		*/

    /* Create file */
    fid1 = H5Fcreate(FILE3, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    CHECK(fid1, FAIL, "H5Fcreate");

    /* Create scalar dataspace for datasets */
    sid1 = H5Screate_simple(0, NULL, NULL);
    CHECK(sid1, FAIL, "H5Screate_simple");

    /* Create a dataset to reference (deleted later) */
    dataset=H5Dcreate(fid1,"Dataset1",H5T_NATIVE_INT,sid1,H5P_DEFAULT);
    CHECK(dataset, FAIL, "H5Dcreate");

    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Create a dataset */
    dataset=H5Dcreate(fid1,"Dataset2",H5T_STD_REF_OBJ,sid1,H5P_DEFAULT);
    CHECK(dataset, FAIL, "H5Dcreate");

    /* Create reference to dataset */
    ret = H5Rcreate(&oref,fid1,"/Dataset1",H5R_OBJECT,-1);
    CHECK(ret, FAIL, "H5Rcreate");
    ret = H5Rget_object_type(dataset,&oref);
    VERIFY(ret, H5G_DATASET, "H5Rget_object_type");

    /* Write selection to disk */
    ret=H5Dwrite(dataset,H5T_STD_REF_OBJ,H5S_ALL,H5S_ALL,H5P_DEFAULT,&oref);
    CHECK(ret, FAIL, "H5Dwrite");

    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Delete referenced dataset */
    ret = H5Gunlink(fid1,"/Dataset1");
    CHECK(ret, FAIL, "H5Gunlink");

    /* Close disk dataspace */
    ret = H5Sclose(sid1);
    CHECK(ret, FAIL, "H5Sclose");
    
    /* Close file */
    ret = H5Fclose(fid1);
    CHECK(ret, FAIL, "H5Fclose");

    /* Re-open the file */
    fid1 = H5Fopen(FILE3, H5F_ACC_RDWR, H5P_DEFAULT);
    CHECK(fid1, FAIL, "H5Fopen");

    /* Open the dataset */
    dataset=H5Dopen(fid1,"/Dataset2");
    CHECK(ret, FAIL, "H5Dcreate");

    /* Read selection from disk */
    memset(&oref,0,sizeof(hobj_ref_t));
    ret=H5Dread(dataset,H5T_STD_REF_OBJ,H5S_ALL,H5S_ALL,H5P_DEFAULT,&oref);
    CHECK(ret, FAIL, "H5Dread");

    /* Open deleted dataset object */
    dset2 = H5Rdereference(dataset,H5R_OBJECT,&oref);
    VERIFY(dset2, FAIL, "H5Rdereference");

    /* Open nonsense reference */
    memset(&oref,0,sizeof(hobj_ref_t));
    dset2 = H5Rdereference(dataset,H5R_OBJECT,&oref);
    VERIFY(dset2, FAIL, "H5Rdereference");

    /* Close Dataset */
    ret = H5Dclose(dataset);
    CHECK(ret, FAIL, "H5Dclose");

    /* Close file */
    ret = H5Fclose(fid1);
    CHECK(ret, FAIL, "H5Fclose");

}   /* test_reference_obj_deleted() */

/****************************************************************
**
**  test_reference(): Main H5R reference testing routine.
** 
****************************************************************/
void 
test_reference(void)
{
    /* Output message about test being performed */
    MESSAGE(5, ("Testing References\n"));

    test_reference_obj();       /* Test basic H5R object reference code */
    test_reference_region();    /* Test basic H5R dataset region reference code */
    test_reference_obj_deleted(); /* Test H5R object reference code for deleted objects */

}   /* test_reference() */


/*-------------------------------------------------------------------------
 * Function:	cleanup_reference
 *
 * Purpose:	Cleanup temporary test files
 *
 * Return:	none
 *
 * Programmer:	Quincey Koziol
 *              September 8, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
void
cleanup_reference(void)
{
    remove(FILE1);
    remove(FILE2);
    remove(FILE3);
}