int
main (void)
{
hid_t vfile, file, src_space, mem_space, vspace,
vdset, dset; /* Handles */
hid_t dcpl, dapl;
herr_t status;
hsize_t vdsdims[3] = {4*DIM0_1, VDSDIM1, VDSDIM2},
vdsdims_max[3] = {VDSDIM0, VDSDIM1, VDSDIM2},
dims[3] = {DIM0_1, DIM1, DIM2},
memdims[3] = {DIM0_1, DIM1, DIM2},
extdims[3] = {0, DIM1, DIM2}, /* Dimensions of the extended source datasets */
chunk_dims[3] = {DIM0_1, DIM1, DIM2},
dims_max[3] = {DIM0, DIM1, DIM2},
vdsdims_out[3],
vdsdims_max_out[3],
start[3], /* Hyperslab parameters */
stride[3],
count[3],
src_count[3],
block[3];
hsize_t start_out[3], /* Hyperslab parameter out */
stride_out[3],
count_out[3],
block_out[3];
int i, j;
H5D_layout_t layout; /* Storage layout */
size_t num_map; /* Number of mappings */
ssize_t len; /* Length of the string; also a return value */
char *filename;
char *dsetname;
int wdata[DIM0_1*DIM1*DIM2];
/*
* Create source files and datasets. This step is optional.
*/
for (i=0; i < PLANE_STRIDE; i++) {
/*
* Initialize data for i-th source dataset.
*/
for (j = 0; j < DIM0_1*DIM1*DIM2; j++) wdata[j] = i+1;
/*
* Create the source files and datasets. Write data to each dataset and
* close all resources.
*/
file = H5Fcreate (SRC_FILE[i], H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
src_space = H5Screate_simple (RANK, dims, dims_max);
dcpl = H5Pcreate(H5P_DATASET_CREATE);
status = H5Pset_chunk (dcpl, RANK, chunk_dims);
dset = H5Dcreate2 (file, SRC_DATASET[i], H5T_NATIVE_INT, src_space, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
wdata);
status = H5Sclose (src_space);
status = H5Pclose (dcpl);
status = H5Dclose (dset);
status = H5Fclose (file);
}
vfile = H5Fcreate (VFILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create VDS dataspace. */
vspace = H5Screate_simple (RANK, vdsdims, vdsdims_max);
/* Create dataspaces for the source dataset. */
src_space = H5Screate_simple (RANK, dims, dims_max);
/* Create VDS creation property */
dcpl = H5Pcreate (H5P_DATASET_CREATE);
/* Initialize hyperslab values */
start[0] = 0;
start[1] = 0;
start[2] = 0;
stride[0] = PLANE_STRIDE; /* we will select every fifth plane in VDS */
stride[1] = 1;
stride[2] = 1;
count[0] = H5S_UNLIMITED;
count[1] = 1;
count[2] = 1;
src_count[0] = H5S_UNLIMITED;
src_count[1] = 1;
src_count[2] = 1;
block[0] = 1;
block[1] = DIM1;
block[2] = DIM2;
/*
* Build the mappings
*
*/
status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, src_count, block);
for (i=0; i < PLANE_STRIDE; i++) {
status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, stride, count, block);
status = H5Pset_virtual (dcpl, vspace, SRC_FILE[i], SRC_DATASET[i], src_space);
start[0]++;
}
H5Sselect_none(vspace);
/* Create a virtual dataset */
vdset = H5Dcreate2 (vfile, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Sclose (vspace);
status = H5Sclose (src_space);
status = H5Pclose (dcpl);
/* Let's add data to the source datasets and check new dimensions for VDS */
/* We will add only one plane to the first source dataset, two planes to the
second one, three to the third, and four to the forth. */
for (i=0; i < PLANE_STRIDE; i++) {
/*
* Initialize data for i-th source dataset.
*/
for (j = 0; j < (i+1)*DIM1*DIM2; j++) wdata[j] = 10*(i+1);
/*
* Open the source files and datasets. Appen data to each dataset and
* close all resources.
*/
file = H5Fopen (SRC_FILE[i], H5F_ACC_RDWR, H5P_DEFAULT);
dset = H5Dopen2 (file, SRC_DATASET[i], H5P_DEFAULT);
extdims[0] = DIM0_1+i+1;
status = H5Dset_extent (dset, extdims);
src_space = H5Dget_space (dset);
start[0] = DIM0_1;
start[1] = 0;
start[2] = 0;
count[0] = 1;
count[1] = 1;
count[2] = 1;
block[0] = i+1;
block[1] = DIM1;
block[2] = DIM2;
memdims[0] = i+1;
mem_space = H5Screate_simple(RANK, memdims, NULL);
status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, count, block);
status = H5Dwrite (dset, H5T_NATIVE_INT, mem_space, src_space, H5P_DEFAULT,
wdata);
status = H5Sclose (src_space);
status = H5Dclose (dset);
status = H5Fclose (file);
}
status = H5Dclose (vdset);
status = H5Fclose (vfile);
/*
* Now we begin the read section of this example.
*/
/*
* Open file and dataset using the default properties.
*/
vfile = H5Fopen (VFILE, H5F_ACC_RDONLY, H5P_DEFAULT);
/*
* Open VDS using different access properties to use max or
* min extents depending on the sizes of the underlying datasets
*/
dapl = H5Pcreate (H5P_DATASET_ACCESS);
for(i = 0; i < 2; i++) {
status = H5Pset_virtual_view (dapl, i ? H5D_VDS_LAST_AVAILABLE : H5D_VDS_FIRST_MISSING);
vdset = H5Dopen2 (vfile, DATASET, dapl);
/* Let's get space of the VDS and its dimension; we should get 32(or 20)x10x10 */
vspace = H5Dget_space (vdset);
H5Sget_simple_extent_dims (vspace, vdsdims_out, vdsdims_max_out);
printf ("VDS dimensions, bounds = H5D_VDS_%s: ", i ? "LAST_AVAILABLE" : "FIRST_MISSING");
for (j=0; j<RANK; j++)
printf (" %d ", (int)vdsdims_out[j]);
printf ("\n");
/* Close */
status = H5Dclose (vdset);
status = H5Sclose (vspace);
}
status = H5Pclose (dapl);
vdset = H5Dopen2 (vfile, DATASET, H5P_DEFAULT);
/*
* Get creation property list and mapping properties.
*/
dcpl = H5Dget_create_plist (vdset);
/*
* Get storage layout.
*/
layout = H5Pget_layout (dcpl);
if (H5D_VIRTUAL == layout)
printf(" Dataset has a virtual layout \n");
else
printf(" Wrong layout found \n");
/*
* Find number of mappings.
*/
status = H5Pget_virtual_count (dcpl, &num_map);
printf(" Number of mappings is %lu\n", (unsigned long)num_map);
/*
* Get mapping parameters for each mapping.
*/
for (i = 0; i < (int)num_map; i++) {
printf(" Mapping %d \n", i);
printf(" Selection in the virtual dataset \n");
/* Get selection in the virttual dataset */
vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(vspace)) {
status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
/* Get source file name */
len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
filename = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
printf(" Source filename %s\n", filename);
/* Get source dataset name */
len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
printf(" Source dataset name %s\n", dsetname);
/* Get selection in the source dataset */
printf(" Selection in the source dataset \n");
src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
if (H5Sget_select_type(src_space) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(src_space)) {
status = H5Sget_regular_hyperslab (src_space, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
H5Sclose(vspace);
H5Sclose(src_space);
free(filename);
free(dsetname);
}
/*
* Close and release resources.
*/
status = H5Pclose (dcpl);
status = H5Dclose (vdset);
status = H5Fclose (vfile);
return 0;
}
int
main (void)
{
hid_t vfile, file, src_space, mem_space, vspace,
vdset, dset; /* Handles */
hid_t dcpl;
herr_t status;
hsize_t vdsdims[3] = {4*DIM0_1, VDSDIM1, VDSDIM2},
vdsdims_max[3] = {VDSDIM0, VDSDIM1, VDSDIM2},
dims[3] = {DIM0_1, DIM1, DIM2},
extdims[3] = {2*DIM0_1, DIM1, DIM2},
chunk_dims[3] = {DIM0_1, DIM1, DIM2},
dims_max[3] = {DIM0, DIM1, DIM2},
vdsdims_out[3],
vdsdims_max_out[3],
start[3], /* Hyperslab parameters */
stride[3],
count[3],
src_count[3],
block[3];
hsize_t start_out[3], /* Hyperslab parameter out */
stride_out[3],
count_out[3],
block_out[3];
int i, j, k;
H5D_layout_t layout; /* Storage layout */
size_t num_map; /* Number of mappings */
ssize_t len; /* Length of the string; also a return value */
char *filename;
char *dsetname;
int wdata[DIM0_1*DIM1*DIM2];
int rdata[80][10][10];
int a_rdata[20][10][10];
/*
* Create source files and datasets. This step is optional.
*/
for (i=0; i < PLANE_STRIDE; i++) {
/*
* Initialize data for i-th source dataset.
*/
for (j = 0; j < DIM0_1*DIM1*DIM2; j++) wdata[j] = i+1;
/*
* Create the source files and datasets. Write data to each dataset and
* close all resources.
*/
file = H5Fcreate (SRC_FILE[i], H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
src_space = H5Screate_simple (RANK, dims, dims_max);
dcpl = H5Pcreate(H5P_DATASET_CREATE);
status = H5Pset_chunk (dcpl, RANK, chunk_dims);
dset = H5Dcreate2 (file, SRC_DATASET[i], H5T_NATIVE_INT, src_space, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
wdata);
status = H5Sclose (src_space);
status = H5Pclose (dcpl);
status = H5Dclose (dset);
status = H5Fclose (file);
}
vfile = H5Fcreate (VFILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create VDS dataspace. */
vspace = H5Screate_simple (RANK, vdsdims, vdsdims_max);
/* Create dataspaces for the source dataset. */
src_space = H5Screate_simple (RANK, dims, dims_max);
/* Create VDS creation property */
dcpl = H5Pcreate (H5P_DATASET_CREATE);
/* Initialize hyperslab values */
start[0] = 0;
start[1] = 0;
start[2] = 0;
stride[0] = PLANE_STRIDE; /* we will select every fifth plane in VDS */
stride[1] = 1;
stride[2] = 1;
count[0] = H5S_UNLIMITED;
count[1] = 1;
count[2] = 1;
src_count[0] = H5S_UNLIMITED;
src_count[1] = 1;
src_count[2] = 1;
block[0] = 1;
block[1] = DIM1;
block[2] = DIM2;
/*
* Build the mappings
*
*/
status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, src_count, block);
for (i=0; i < PLANE_STRIDE; i++) {
status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, stride, count, block);
status = H5Pset_virtual (dcpl, vspace, SRC_FILE[i], SRC_DATASET[i], src_space);
start[0]++;
}
H5Sselect_none(vspace);
/* Create a virtual dataset */
vdset = H5Dcreate2 (vfile, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Sclose (vspace);
status = H5Sclose (src_space);
status = H5Pclose (dcpl);
/* Let's get space of the VDS and its dimension; we should get 40x10x10 */
vspace = H5Dget_space (vdset);
H5Sget_simple_extent_dims (vspace, vdsdims_out, vdsdims_max_out);
printf ("VDS dimensions first time \n");
printf (" Current: ");
for (i=0; i<RANK; i++)
printf (" %d ", (int)vdsdims_out[i]);
printf ("\n");
/* Let's add data to the source datasets and check new dimensions for VDS */
for (i=0; i < PLANE_STRIDE; i++) {
/*
* Initialize data for i-th source dataset.
*/
for (j = 0; j < DIM0_1*DIM1*DIM2; j++) wdata[j] = 10*(i+1);
/*
* Create the source files and datasets. Write data to each dataset and
* close all resources.
*/
file = H5Fopen (SRC_FILE[i], H5F_ACC_RDWR, H5P_DEFAULT);
dset = H5Dopen2 (file, SRC_DATASET[i], H5P_DEFAULT);
status = H5Dset_extent (dset, extdims);
src_space = H5Dget_space (dset);
start[0] = DIM0_1;
start[1] = 0;
start[2] = 0;
count[0] = 1;
count[1] = 1;
count[2] = 1;
block[0] = DIM0_1;
block[1] = DIM1;
block[2] = DIM2;
mem_space = H5Screate_simple(RANK, dims, NULL);
status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, count, block);
status = H5Dwrite (dset, H5T_NATIVE_INT, mem_space, src_space, H5P_DEFAULT,
wdata);
status = H5Sclose (src_space);
status = H5Dclose (dset);
status = H5Fclose (file);
}
status = H5Dclose (vdset);
status = H5Fclose (vfile);
/*
* Now we begin the read section of this example.
*/
/*
* Open file and dataset using the default properties.
*/
vfile = H5Fopen (VFILE, H5F_ACC_RDONLY, H5P_DEFAULT);
vdset = H5Dopen2 (vfile, DATASET, H5P_DEFAULT);
/*
* Get creation property list and mapping properties.
*/
dcpl = H5Dget_create_plist (vdset);
/*
* Get storage layout.
*/
layout = H5Pget_layout (dcpl);
if (H5D_VIRTUAL == layout)
printf(" Dataset has a virtual layout \n");
else
printf(" Wrong layout found \n");
/*
* Find number of mappings.
*/
status = H5Pget_virtual_count (dcpl, &num_map);
printf(" Number of mappings is %lu\n", (unsigned long)num_map);
/*
* Get mapping parameters for each mapping.
*/
for (i = 0; i < (int)num_map; i++) {
printf(" Mapping %d \n", i);
printf(" Selection in the virtual dataset \n");
/* Get selection in the virttual dataset */
vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(vspace)) {
status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
/* Get source file name */
len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
filename = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
printf(" Source filename %s\n", filename);
/* Get source dataset name */
len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
printf(" Source dataset name %s\n", dsetname);
/* Get selection in the source dataset */
printf(" Selection in the source dataset \n");
src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
if (H5Sget_select_type(src_space) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(src_space)) {
status = H5Sget_regular_hyperslab (src_space, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
H5Sclose(vspace);
H5Sclose(src_space);
free(filename);
free(dsetname);
}
/*
* Read data from VDS.
*/
vspace = H5Dget_space (vdset);
H5Sget_simple_extent_dims (vspace, vdsdims_out, vdsdims_max_out);
printf ("VDS dimensions second time \n");
printf (" Current: ");
for (i=0; i<RANK; i++)
printf (" %d ", (int)vdsdims_out[i]);
printf ("\n");
/* Read all VDS data */
/* EIP We should be able to do it by using H5S_ALL instead of making selection
* or using H5Sselect_all from vspace.
*/
start[0] = 0;
start[1] = 0;
start[2] = 0;
count[0] = 1;
count[1] = 1;
count[2] = 1;
block[0] = vdsdims_out[0];
block[1] = vdsdims_out[1];
block[2] = vdsdims_out[2];
status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, NULL, count, block);
mem_space = H5Screate_simple(RANK, vdsdims_out, NULL);
status = H5Dread (vdset, H5T_NATIVE_INT, mem_space, vspace, H5P_DEFAULT,
rdata);
printf (" All data: \n");
for (i=0; i < (int)vdsdims_out[0]; i++) {
for (j=0; j < (int)vdsdims_out[1]; j++) {
printf ("(%d, %d, 0)", i, j);
for (k=0; k < (int)vdsdims_out[2]; k++)
printf (" %d ", rdata[i][j][k]);
printf ("\n");
}
}
/* Read VDS, but only data mapeed to dataset a.h5 */
start[0] = 0;
start[1] = 0;
start[2] = 0;
stride[0] = PLANE_STRIDE;
stride[1] = 1;
stride[2] = 1;
count[0] = 2*DIM0_1;
count[1] = 1;
count[2] = 1;
block[0] = 1;
block[1] = vdsdims_out[1];
block[2] = vdsdims_out[2];
dims[0] = 2*DIM0_1;
status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, stride, count, block);
mem_space = H5Screate_simple(RANK, dims, NULL);
status = H5Dread (vdset, H5T_NATIVE_INT, mem_space, vspace, H5P_DEFAULT,
a_rdata);
printf (" All data: \n");
for (i=0; i < 2*DIM0_1; i++) {
for (j=0; j < (int)vdsdims_out[1]; j++) {
printf ("(%d, %d, 0)", i, j);
for (k=0; k < (int)vdsdims_out[2]; k++)
printf (" %d ", a_rdata[i][j][k]);
printf ("\n");
}
}
/*
* Close and release resources.
*/
status = H5Sclose(mem_space);
status = H5Pclose (dcpl);
status = H5Dclose (vdset);
status = H5Fclose (vfile);
return 0;
}
int
main (void)
{
hid_t file, space, src_space, vspace, dset; /* Handles */
hid_t dcpl;
herr_t status;
hsize_t vdsdims[2] = {DIM0, DIM1}, /* Virtual dataset dimension */
dims[2] = {DIM0, DIM1}; /* Source dataset dimensions */
int wdata[DIM0][DIM1], /* Write buffer for source dataset */
rdata[DIM0][DIM1], /* Read buffer for virtual dataset */
i, j;
H5D_layout_t layout; /* Storage layout */
size_t num_map; /* Number of mappings */
ssize_t len; /* Length of the string; also a return value */
char *filename;
char *dsetname;
/*
* Initialize data.
*/
for (i = 0; i < DIM0; i++)
for (j = 0; j < DIM1; j++) wdata[i][j] = i+1;
/*
* Create the source file and the dataset. Write data to the source dataset
* and close all resources.
*/
file = H5Fcreate (SRC_FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
space = H5Screate_simple (RANK, dims, NULL);
dset = H5Dcreate2 (file, SRC_DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT,
H5P_DEFAULT, H5P_DEFAULT);
status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
wdata[0]);
status = H5Sclose (space);
status = H5Dclose (dset);
status = H5Fclose (file);
/* Create file in which virtual dataset will be stored. */
file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create VDS dataspace. */
vspace = H5Screate_simple (RANK, vdsdims, NULL);
/* Set VDS creation property. */
dcpl = H5Pcreate (H5P_DATASET_CREATE);
/*
* Build the mappings.
* Selections in the source datasets are H5S_ALL.
* In the virtual dataset we select the first, the second and the third rows
* and map each row to the data in the corresponding source dataset.
*/
src_space = H5Screate_simple (RANK, dims, NULL);
status = H5Pset_virtual (dcpl, vspace, SRC_FILE, SRC_DATASET, src_space);
/* Create a virtual dataset. */
dset = H5Dcreate2 (file, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Sclose (vspace);
status = H5Sclose (src_space);
status = H5Dclose (dset);
status = H5Fclose (file);
/*
* Now we begin the read section of this example.
*/
/*
* Open the file and virtual dataset.
*/
file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dset = H5Dopen2 (file, DATASET, H5P_DEFAULT);
/*
* Get creation property list and mapping properties.
*/
dcpl = H5Dget_create_plist (dset);
/*
* Get storage layout.
*/
layout = H5Pget_layout (dcpl);
if (H5D_VIRTUAL == layout)
printf(" Dataset has a virtual layout \n");
else
printf(" Wrong layout found \n");
/*
* Find the number of mappings.
*/
status = H5Pget_virtual_count (dcpl, &num_map);
printf(" Number of mappings is %lu\n", (unsigned long)num_map);
/*
* Get mapping parameters for each mapping.
*/
for (i = 0; i < (int)num_map; i++) {
printf(" Mapping %d \n", i);
printf(" Selection in the virtual dataset ");
/* Get selection in the virttual dataset */
vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
/* Make sure it is ALL selection and then print selection. */
if(H5Sget_select_type(vspace) == H5S_SEL_ALL) {
printf("Selection is H5S_ALL \n");
}
/* Get source file name. */
len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
filename = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
printf(" Source filename %s\n", filename);
/* Get source dataset name. */
len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
printf(" Source dataset name %s\n", dsetname);
/* Get selection in the source dataset. */
printf(" Selection in the source dataset ");
src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
/* Make sure it is ALL selection and then print selection. */
if(H5Sget_select_type(src_space) == H5S_SEL_ALL) {
printf("Selection is H5S_ALL \n");
}
H5Sclose(vspace);
H5Sclose(src_space);
free(filename);
free(dsetname);
}
/*
* Read the data using the default properties.
*/
status = H5Dread (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
rdata[0]);
/*
* Output the data to the screen.
*/
printf (" VDS Data:\n");
for (i=0; i<DIM0; i++) {
printf (" [");
for (j=0; j<DIM1; j++)
printf (" %3d", rdata[i][j]);
printf ("]\n");
}
/*
* Close and release resources.
*/
status = H5Pclose (dcpl);
status = H5Dclose (dset);
status = H5Fclose (file);
return 0;
}
int
main (void)
{
hid_t file, src_space, vspace,
dset; /* Handles */
hid_t dcpl;
herr_t status;
hsize_t vdsdims[3] = {VDSDIM0, VDSDIM1, VDSDIM2},
vdsdims_max[3] = {H5S_UNLIMITED, VDSDIM1, VDSDIM1},
dims[3] = {DIM0, DIM1, DIM2},
start[3], /* Hyperslab parameters */
stride[3],
count[3],
block[3];
hsize_t start_out[3], /* Hyperslab parameter out */
stride_out[3],
count_out[3],
block_out[3];
int i;
H5D_layout_t layout; /* Storage layout */
size_t num_map; /* Number of mappings */
ssize_t len; /* Length of the string; also a return value */
char *filename;
char *dsetname;
file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create VDS dataspace. */
vspace = H5Screate_simple (RANK, vdsdims, vdsdims_max);
/* Create dataspaces for the source dataset. */
src_space = H5Screate_simple (RANK, dims, NULL);
/* Create VDS creation property */
dcpl = H5Pcreate (H5P_DATASET_CREATE);
/* Initialize hyperslab values */
start[0] = 0;
start[1] = 0;
start[2] = 0;
stride[0] = DIM0;
stride[1] = 1;
stride[2] = 1;
count[0] = H5S_UNLIMITED;
count[1] = 1;
count[2] = 1;
block[0] = DIM0;
block[1] = DIM1;
block[2] = DIM2;
/*
* Build the mappings
*
*/
status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, stride, count, block);
status = H5Pset_virtual (dcpl, vspace, "f-%b.h5", "/A", src_space);
/* Create a virtual dataset */
dset = H5Dcreate2 (file, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Sclose (vspace);
status = H5Sclose (src_space);
status = H5Dclose (dset);
status = H5Fclose (file);
/*
* Now we begin the read section of this example.
*/
/*
* Open file and dataset using the default properties.
*/
file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dset = H5Dopen2 (file, DATASET, H5P_DEFAULT);
/*
* Get creation property list and mapping properties.
*/
dcpl = H5Dget_create_plist (dset);
/*
* Get storage layout.
*/
layout = H5Pget_layout (dcpl);
if (H5D_VIRTUAL == layout)
printf(" Dataset has a virtual layout \n");
else
printf(" Wrong layout found \n");
/*
* Find number of mappings.
*/
status = H5Pget_virtual_count (dcpl, &num_map);
printf(" Number of mappings is %d\n", (int)num_map);
/*
* Get mapping parameters for each mapping.
*/
for (i = 0; i < (int)num_map; i++) {
printf(" Mapping %d \n", i);
printf(" Selection in the virtual dataset \n");
/* Get selection in the virttual dataset */
vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(vspace)) {
status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
/* Get source file name */
len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
filename = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
printf(" Source filename %s\n", filename);
/* Get source dataset name */
len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
printf(" Source dataset name %s\n", dsetname);
/* Get selection in the source dataset */
printf(" Selection in the source dataset ");
src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
if(H5Sget_select_type(src_space) == H5S_SEL_ALL) {
printf("H5S_ALL \n");
}
/* EIP read data back */
H5Sclose(vspace);
H5Sclose(src_space);
free(filename);
free(dsetname);
}
/*
* Close and release resources.
*/
status = H5Pclose (dcpl);
status = H5Dclose (dset);
status = H5Fclose (file);
return 0;
}