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Diffstat (limited to 'examples/h5_vds-exc.c')
| -rw-r--r-- | examples/h5_vds-exc.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/examples/h5_vds-exc.c b/examples/h5_vds-exc.c new file mode 100644 index 0000000..124d22b --- /dev/null +++ b/examples/h5_vds-exc.c @@ -0,0 +1,212 @@ +/************************************************************ + + This example illustrates the concept of the virtual dataset. + Excalibur use case with k=2 and m=3. + This file is intended for use with HDF5 Library version 1.10 + + ************************************************************/ + +#include "hdf5.h" +#include <stdio.h> +#include <stdlib.h> + +#define FILE "vds-excalibur.h5" +#define DATASET "VDS-excalibur" +#define VDSDIM1 6 +#define VDSDIM0 15 +#define KDIM0 2 +#define KDIM1 6 +#define NDIM0 3 +#define NDIM1 6 +#define RANK 3 + +const char *SRC_FILE[] = { + "a.h5", + "b.h5", + "c.h5", + "d.h5", + "e.h5", + "f.h5" +}; + +const char *SRC_DATASET[] = { + "A", + "B", + "C", + "D", + "E", + "F" +}; + +int +main (void) +{ + hid_t file, space, ksrc_space, nsrc_space, vspace, + src_space, + dset; /* Handles */ + hid_t dcpl; + herr_t status; + hsize_t vdsdims[3] = {0,VDSDIM0, VDSDIM1}, + vdsdims_max[3] = {H5S_UNLIMITED,VDSDIM0, VDSDIM1}, + kdims[3] = {0, KDIM0, KDIM1}, + kdims_max[3] = {H5S_UNLIMITED, KDIM0, KDIM1}, + ndims[3] = {0, NDIM0, NDIM1}, + ndims_max[3] = {H5S_UNLIMITED, NDIM0, NDIM1}, + start[3], /* Hyperslab parameters */ + stride[3], + count[3], + block[3]; + hsize_t start_out[3], + stride_out[3], + count_out[3], + block_out[3]; + int k = 2; + int n = 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; + hsize_t nblocks; + hsize_t *buf; /* Buffer to hold hyperslab coordinates */ + + + file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); + + /* Create VDS dataspace. */ + space = H5Screate_simple (RANK, vdsdims, vdsdims_max); + /* Create dataspaces for A, C, and E datasets. */ + ksrc_space = H5Screate_simple (RANK, kdims, kdims_max); + /* Create dataspaces for B, D, and F datasets. */ + nsrc_space = H5Screate_simple (RANK, ndims, ndims_max); + + /* Create VDS creation property */ + dcpl = H5Pcreate (H5P_DATASET_CREATE); + + /* Initialize hyperslab values */ + + start[0] = 0; + start[1] = 0; + start[2] = 0; + count[0] = H5S_UNLIMITED; + count[1] = 1; + count[2] = 1; + block[0] = 1; + block[1] = k; + block[2] = VDSDIM1; + + /* + * Build the mappings for A, C and E source datasets. + * + */ + for (i = 0; i < 3; i++) { + start[0] = (hsize_t)((k+n)*i); + status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block); + status = H5Pset_virtual (dcpl, space, SRC_FILE[2*i], SRC_DATASET[2*i], ksrc_space); + } + + /* Reinitialize block[1] */ + block[1] = n; + /* + * Build the mappings for B, D and F source datasets. + * + */ + for (i = 0; i < 3; i++) { + start[0] = (hsize_t)(k+(k+n)*i); + status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block); + status = H5Pset_virtual (dcpl, space, SRC_FILE[2*i+1], SRC_DATASET[2*i+1], nsrc_space); + } + + /* Create a virtual dataset */ + dset = H5Dcreate (file, DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT, + dcpl, H5P_DEFAULT); + status = H5Sclose (space); + status = H5Sclose (nsrc_space); + status = H5Sclose (ksrc_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 = H5Dopen (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", 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 = [%d, %d, %d] \n", (int)start_out[0], (int)start_out[1], (int)start_out[2]); + printf(" stride = [%d, %d, %d] \n", (int)stride_out[0], (int)stride_out[1], (int)stride_out[2]); + printf(" count = [%d, %d, %d] \n", (int)count_out[0], (int)count_out[1], (int)count_out[2]); + printf(" block = [%d, %d, %d] \n", (int)block_out[0], (int)block_out[1], (int)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"); + } + H5Sclose(vspace); + H5Sclose(src_space); + free(filename); + free(dsetname); + } + + /* + * Close and release resources. + */ + status = H5Pclose (dcpl); + status = H5Dclose (dset); + status = H5Fclose (file); + + return 0; +} + |