/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*****************************************************************************
  This test generates attributes, groups, and datasets of many types. It
  creates a large number of attributes, groups, and datasets by specifying
  -a, -g, -d options respectively. Using "-h" option to see details.

 ****************************************************************************/

#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>

#define FNAME     "test_perf.h5"
#define NGROUPS   20
#define NDSETS    20
#define NATTRS    20
#define DIM0      40
#define NROWS     100
#define NTYPES    9
#define MAXVLEN   10
#define FIXED_LEN 8

typedef enum { SOLID = 0, LIQUID, GAS, PLASMA } phase_t;

typedef struct {
    int                i;
    unsigned long long l;
    float              f;
    double             d;
    char               s[FIXED_LEN];
    phase_t            e;
    float              f_array[FIXED_LEN];
    hvl_t              i_vlen;
    char              *s_vlen;
} test_comp_t;

typedef struct {
    int   zipcode;
    char *city;
} zipcode_t;

int    add_attrs(hid_t oid, int idx);
int    add_attr(hid_t oid, const char *name, hid_t tid, hid_t sid, void *buf);
herr_t create_perf_test_file(const char *fname, int ngrps, int ndsets, int nattrs, hsize_t nrows,
                             hsize_t dim0, hsize_t chunk, int vlen, int compressed, int latest);

int
main(int argc, char *argv[])
{
    char fname[32];
    int  i, ngrps = NGROUPS, ndsets = NDSETS, nattrs = NATTRS, dim0 = DIM0, chunk = DIM0 / 10 + 1,
           nrows = NROWS, vlen = MAXVLEN, l = 0, z = 0;

    memset(fname, 0, 32);
    for (i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-f") == 0)
            strcpy(fname, argv[i + 1]);
        else if (strcmp(argv[i], "-g") == 0)
            ngrps = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-d") == 0)
            ndsets = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-a") == 0)
            nattrs = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-r") == 0)
            nrows = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-s") == 0)
            dim0 = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-c") == 0)
            chunk = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-v") == 0)
            vlen = atoi(argv[i + 1]);
        else if (strcmp(argv[i], "-l") == 0)
            l = 1;
        else if (strcmp(argv[i], "-z") == 0)
            z = 1;
        else if (strcmp(argv[i], "-h") == 0) {
            printf("\nOPTONS:\n");
            printf("\t-f F:\tname of the test file (default: %s).\n", FNAME);
            printf("\t-g N:\tnumber of top level groups (default: %d).\n", NGROUPS);
            printf("\t-d N:\tnumber of datasets (default: %d).\n", NDSETS);
            printf("\t-a N:\tnumber of attributes (default: %d).\n", NATTRS);
            printf("\t-r N:\tnumber of rows in the large compound dataset (default: %d).\n", NROWS);
            printf("\t-s N:\tsize of dim0 in datasets (default: %d).\n", DIM0);
            printf("\t-c N:\tchunk size of dim0 (default: %d).\n", (DIM0 / 10 + 1));
            printf("\t-v N:\tmax vlen size (default: %d).\n", MAXVLEN);
            printf("\t-l:\tuse latest format (default: no).\n");
            printf("\t-z:\tuse gzip compression (default: no).\n");
            printf("\t-h:\tthis help information.\n");
            printf("Example:\n");
            printf("\t./a.out -f test.h5 -g 10000 -d 5000 -a 500 -r 10000 -s 200 -c 20 -v 40 -l -z\n\n");
            exit(0);
        }
    }

    if (strlen(fname) <= 0)
        snprintf(fname, sizeof(fname), FNAME);

    create_perf_test_file(fname, ngrps, ndsets, nattrs, (hsize_t)nrows, (hsize_t)dim0, (hsize_t)chunk, vlen,
                          z, l);

    return 0;
}

/*****************************************************************************
  This function generates attributes, groups, and datasets of many types.

  Parameters:
            fname:    file_name.
            ngrps:    number of top level groups.
            ndsets:    number of datasets.
            attrs:    number of attributes.
            nrow:    number of rows in a dataset.
            chunk:    chunk size (single number).
            vlen:    max vlen size.
            comp:    use latest format.
            latest:    use gzip comnpression.

  Return:  Non-negative on success/Negative on failure

 ****************************************************************************/
herr_t
create_perf_test_file(const char *fname, int ngrps, int ndsets, int nattrs, hsize_t nrows, hsize_t dim0,
                      hsize_t chunk, int vlen, int compressed, int latest)
{
    int   i, j, k;
    hid_t fid, sid_null, sid_scalar, sid_1d, sid_2d, did, aid, sid_2, sid_large,
        fapl = H5P_DEFAULT, dcpl = H5P_DEFAULT, gid1, gid2, cmp_tid, tid_str, tid_enum, tid_array_f,
        tid_vlen_i, tid_vlen_s;
    char    name[32], tmp_name1[32], tmp_name2[32], tmp_name3[32];
    hsize_t dims[1] = {dim0}, dims2d[2] = {dim0, (dim0 / 4 + 1)}, dims_array[1] = {FIXED_LEN}, dim1[1] = {2};
    char   *enum_names[4] = {"SOLID", "LIQUID", "GAS", "PLASMA"};
    test_comp_t *buf_comp = NULL, *buf_comp_large = NULL;
    int         *buf_int           = NULL;
    float(*buf_float_a)[FIXED_LEN] = NULL;
    double **buf_double2d          = NULL;
    hvl_t   *buf_vlen_i            = NULL;
    char(*buf_str)[FIXED_LEN];
    char          **buf_vlen_s = NULL;
    hobj_ref_t      buf_ref[2];
    hdset_reg_ref_t buf_reg_ref[2];
    size_t          offset, len;
    herr_t          status;
    char           *names[NTYPES] = {"int",
                           "ulong",
                           "float",
                           "double",
                           "fixed string",
                           "enum",
                           "fixed float array",
                           "vlen int array",
                           "vlen strings"};
    hid_t   types[NTYPES] = {H5T_NATIVE_INT, H5T_NATIVE_UINT64, H5T_NATIVE_FLOAT, H5T_NATIVE_DOUBLE, tid_str,
                           tid_enum,       tid_array_f,       tid_vlen_i,       tid_vlen_s};
    hsize_t coords[4][2] = {{0, 1}, {3, 5}, {1, 0}, {2, 4}}, start = 0, stride = 1, count = 1;

    if (nrows < NROWS)
        nrows = NROWS;
    if (ngrps < NGROUPS)
        ngrps = NGROUPS;
    if (ndsets < NDSETS)
        ndsets = NDSETS;
    if (nattrs < NATTRS)
        nattrs = NATTRS;
    if (dim0 < DIM0)
        dim0 = DIM0;
    if (chunk > dim0)
        chunk = dim0 / 4;
    if (chunk < 1)
        chunk = 1;
    if (vlen < 1)
        vlen = MAXVLEN;

    /* create fixed string datatype */
    types[4] = tid_str = H5Tcopy(H5T_C_S1);
    H5Tset_size(tid_str, FIXED_LEN);

    /* create enum datatype */
    types[5] = tid_enum = H5Tenum_create(H5T_NATIVE_INT);
    for (i = (int)SOLID; i <= (int)PLASMA; i++) {
        phase_t val = (phase_t)i;
        status      = H5Tenum_insert(tid_enum, enum_names[i], &val);
    }

    /* create float array datatype */
    types[6] = tid_array_f = H5Tarray_create(H5T_NATIVE_FLOAT, 1, dims_array);

    /* create variable length integer datatypes */
    types[7] = tid_vlen_i = H5Tvlen_create(H5T_NATIVE_INT);

    /* create variable length string datatype */
    types[8] = tid_vlen_s = H5Tcopy(H5T_C_S1);
    H5Tset_size(tid_vlen_s, H5T_VARIABLE);

    /* create compound datatypes */
    cmp_tid = H5Tcreate(H5T_COMPOUND, sizeof(test_comp_t));
    offset  = 0;
    for (i = 0; i < NTYPES - 2; i++) {
        H5Tinsert(cmp_tid, names[i], offset, types[i]);
        offset += H5Tget_size(types[i]);
    }

    H5Tinsert(cmp_tid, names[7], offset, types[7]);
    offset += sizeof(hvl_t);
    H5Tinsert(cmp_tid, names[8], offset, types[8]);

    /* create dataspace */
    sid_1d     = H5Screate_simple(1, dims, NULL);
    sid_2d     = H5Screate_simple(2, dims2d, NULL);
    sid_2      = H5Screate_simple(1, dim1, NULL);
    sid_large  = H5Screate_simple(1, &nrows, NULL);
    sid_null   = H5Screate(H5S_NULL);
    sid_scalar = H5Screate(H5S_SCALAR);

    /* create fid access property */
    fapl = H5Pcreate(H5P_FILE_ACCESS);
    H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST);

    /* create dataset creation property */
    dcpl = H5Pcreate(H5P_DATASET_CREATE);

    /* set dataset chunk */
    if (chunk > 0) {
        H5Pset_chunk(dcpl, 1, &chunk);
    }

    /* set dataset compression */
    if (compressed) {
        if (chunk <= 0) {
            chunk = dim0 / 10 + 1;
            ;
            H5Pset_chunk(dcpl, 1, &chunk);
        }
        H5Pset_shuffle(dcpl);
        H5Pset_deflate(dcpl, 6);
    }

    /* allocate buffers */
    buf_comp       = (test_comp_t *)calloc(dim0, sizeof(test_comp_t));
    buf_comp_large = (test_comp_t *)calloc(nrows, sizeof(test_comp_t));
    buf_int        = (int *)calloc(dim0, sizeof(int));
    buf_float_a    = malloc(dim0 * sizeof(*buf_float_a));
    buf_vlen_i     = (hvl_t *)calloc(dim0, sizeof(hvl_t));
    buf_vlen_s     = (char **)calloc(dim0, sizeof(char *));
    buf_str        = malloc(dim0 * sizeof(*buf_str));

    /* allocate array of double pointers */
    buf_double2d = (double **)calloc(dims2d[0], sizeof(double *));
    /* allocate a contiguous chunk of memory for the data */
    buf_double2d[0] = (double *)calloc(dims2d[0] * dims2d[1], sizeof(double));
    /* assign memory city to pointer array */
    for (i = 1; i < dims2d[0]; i++)
        buf_double2d[i] = buf_double2d[0] + i * dims2d[1];

    /* fill buffer values */
    len = 1;
    for (i = 0; i < dims[0]; i++) {
        buf_comp[i].i = buf_int[i] = i - 2147483648;
        buf_comp[i].l              = 0xffffffffffffffff - i;
        buf_comp[i].f              = 1.0 / (i + 1.0);
        buf_comp[i].d              = 987654321.0 * i + 1.0 / (i + 1.0);
        buf_comp[i].e              = (phase_t)(i % (int)(PLASMA + 1));

        for (j = 0; j < FIXED_LEN; j++) {
            buf_comp[i].f_array[j] = buf_float_a[i][j] = i * 100 + j;
            buf_str[i][j]                              = 'a' + (i % 26);
        }
        buf_str[i][FIXED_LEN - 1] = 0;
        strcpy(buf_comp[i].s, buf_str[i]);

        len = (1 - cos(i / 8.0)) / 2 * vlen + 1;
        if (!i)
            len = vlen;
        buf_vlen_i[i].len = len;
        buf_vlen_i[i].p   = (int *)calloc(len, sizeof(int));
        for (j = 0; j < len; j++)
            ((int *)(buf_vlen_i[i].p))[j] = i * 100 + j;
        buf_comp[i].i_vlen = buf_vlen_i[i];

        buf_vlen_s[i] = (char *)calloc(len, sizeof(char));
        for (j = 0; j < len - 1; j++)
            buf_vlen_s[i][j] = j % 26 + 'A';
        buf_comp[i].s_vlen = buf_vlen_s[i];

        for (j = 0; j < dims2d[1]; j++)
            buf_double2d[i][j] = i + j / 10000.0;
    }

    for (i = 0; i < nrows; i++) {
        buf_comp_large[i].i = i - 2147483648;
        buf_comp_large[i].l = 0xffffffffffffffff - i;
        buf_comp_large[i].f = 1.0 / (i + 1.0);
        buf_comp_large[i].d = 987654321.0 * i + 1.0 / (i + 1.0);
        buf_comp_large[i].e = (phase_t)(i % (int)(PLASMA + 1));
        for (j = 0; j < FIXED_LEN - 1; j++) {
            buf_comp_large[i].f_array[j] = i * 100 + j;
            buf_comp_large[i].s[j]       = 'a' + (i % 26);
        }
        len                          = i % vlen + 1;
        buf_comp_large[i].i_vlen.len = len;
        buf_comp_large[i].i_vlen.p   = (int *)calloc(len, sizeof(int));
        for (j = 0; j < len; j++)
            ((int *)(buf_comp_large[i].i_vlen.p))[j] = i * 100 + j;
        buf_comp_large[i].s_vlen = (char *)calloc(i + 2, sizeof(char));
        for (j = 0; j < i + 1; j++)
            (buf_comp_large[i].s_vlen)[j] = j % 26 + 'A';
    }

    /* create file */
    if (latest)
        fid = H5Fcreate(fname, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
    else
        fid = H5Fcreate(fname, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    add_attrs(fid, 0);

    snprintf(name, sizeof(name), "a cmp ds of %d rows", nrows);
    did = H5Dcreate(fid, name, cmp_tid, sid_large, H5P_DEFAULT, dcpl, H5P_DEFAULT);
    H5Dwrite(did, cmp_tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_comp_large);
    add_attrs(did, 0);
    H5Dclose(did);

    // /* add attributes*/
    gid1 = H5Gcreate(fid, "attributes", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
    if (nattrs < 1)
        nattrs = 1;
    i = 0;
    while (i < nattrs)
        i += add_attrs(gid1, i);
    H5Gclose(gid1);

    /* add many sub groups to a group*/
    gid1 = H5Gcreate(fid, "groups", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
    add_attrs(gid1, 0);
    for (i = 0; i < ngrps; i++) {
        /* create sub groups */
        snprintf(name, sizeof(name), "g%02d", i);
        gid2 = H5Gcreate(gid1, name, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        if (i < 10)
            add_attrs(gid2, 0);
        H5Gclose(gid2);
    }
    H5Gclose(gid1);

    /* add many datasets to a group */
    gid1 = H5Gcreate(fid, "datasets", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
    add_attrs(gid1, 0);
    for (j = 0; j < ndsets; j += 12) {
        /* 1 add a null dataset */
        snprintf(name, sizeof(name), "%05d null dataset", j);
        did = H5Dcreate(gid1, name, H5T_STD_I32LE, sid_null, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 2 add scalar int point */
        snprintf(name, sizeof(name), "%05d scalar int point", j);
        did = H5Dcreate(gid1, name, H5T_NATIVE_INT, sid_scalar, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, &j);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 3 scalar vlen string */
        snprintf(name, sizeof(name), "%05d scalar vlen string", j);
        did = H5Dcreate(gid1, name, tid_vlen_s, sid_scalar, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        H5Dwrite(did, tid_vlen_s, H5S_ALL, H5S_ALL, H5P_DEFAULT, &buf_vlen_s[0]);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 4 add fixed-length float array */
        snprintf(name, sizeof(name), "%05d fixed-length float array", j);
        did = H5Dcreate(gid1, name, tid_array_f, sid_1d, H5P_DEFAULT, dcpl, H5P_DEFAULT);
        H5Dwrite(did, tid_array_f, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_float_a);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 5 add fixed-length strings */
        snprintf(name, sizeof(name), "%05d fixed-length strings", j);
        did = H5Dcreate(gid1, name, tid_str, sid_1d, H5P_DEFAULT, dcpl, H5P_DEFAULT);
        H5Dwrite(did, tid_str, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_str);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 6 add compound data */
        snprintf(name, sizeof(name), "%05d compound data", j);
        did = H5Dcreate(gid1, name, cmp_tid, sid_1d, H5P_DEFAULT, dcpl, H5P_DEFAULT);
        H5Dwrite(did, cmp_tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_comp);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 7 add 2D double */
        snprintf(name, sizeof(name), "%05d 2D double", j);
        strcpy(tmp_name1, name);
        did = H5Dcreate(gid1, name, H5T_NATIVE_DOUBLE, sid_2d, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        H5Dwrite(did, H5T_NATIVE_DOUBLE, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_double2d[0]);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 8 add 1D int array */
        snprintf(name, sizeof(name), "%05d 1D int array", j);
        did = H5Dcreate(gid1, name, H5T_NATIVE_INT, sid_1d, H5P_DEFAULT, dcpl, H5P_DEFAULT);
        H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_int);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 9 add vlen int array */
        snprintf(name, sizeof(name), "%05d vlen int array", j);
        strcpy(tmp_name2, name);
        did = H5Dcreate(gid1, name, tid_vlen_i, sid_1d, H5P_DEFAULT, dcpl, H5P_DEFAULT);
        H5Dwrite(did, tid_vlen_i, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_vlen_i);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 10 add vlen strings */
        snprintf(name, sizeof(name), "%05d vlen strings", j);
        strcpy(tmp_name3, name);
        did = H5Dcreate(gid1, name, tid_vlen_s, sid_1d, H5P_DEFAULT, dcpl, H5P_DEFAULT);
        H5Dwrite(did, tid_vlen_s, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_vlen_s);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 11 add object refs */
        H5Rcreate(&buf_ref[0], gid1, ".", H5R_OBJECT, (hid_t)-1);
        H5Rcreate(&buf_ref[1], gid1, tmp_name3, H5R_OBJECT, (hid_t)-1);
        snprintf(name, sizeof(name), "%05d obj refs", j);
        did = H5Dcreate(gid1, name, H5T_STD_REF_OBJ, sid_2, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        H5Dwrite(did, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_ref);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);

        /* 12 add region refs */
        H5Sselect_elements(sid_2d, H5S_SELECT_SET, 4, coords[0]);
        H5Rcreate(&buf_reg_ref[0], gid1, tmp_name1, H5R_DATASET_REGION, sid_2d);
        H5Sselect_none(sid_2d);
        count = dims[0] / 2 + 1;
        H5Sselect_hyperslab(sid_1d, H5S_SELECT_SET, &start, &stride, &count, NULL);
        H5Rcreate(&buf_reg_ref[1], gid1, tmp_name2, H5R_DATASET_REGION, sid_1d);
        H5Sselect_none(sid_1d);
        snprintf(name, sizeof(name), "%05d region refs", j);
        did = H5Dcreate(gid1, name, H5T_STD_REF_DSETREG, sid_2, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        H5Dwrite(did, H5T_STD_REF_DSETREG, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_reg_ref);
        if (!j)
            add_attrs(did, j);
        H5Dclose(did);
    }
    H5Gclose(gid1);

    H5Tclose(tid_array_f);
    H5Tclose(tid_vlen_i);
    H5Tclose(tid_vlen_s);
    H5Tclose(tid_enum);
    H5Tclose(tid_str);
    H5Tclose(cmp_tid);
    H5Pclose(dcpl);
    H5Pclose(fapl);
    H5Sclose(sid_1d);
    H5Sclose(sid_2d);
    H5Sclose(sid_2);
    H5Sclose(sid_large);
    H5Sclose(sid_null);
    H5Sclose(sid_scalar);
    H5Fclose(fid);

    for (i = 0; i < dims[0]; i++) {
        if (buf_vlen_i[i].p)
            free(buf_vlen_i[i].p);
        if (buf_vlen_s[i])
            free(buf_vlen_s[i]);
    }

    for (i = 0; i < nrows; i++) {
        if (buf_comp_large[i].i_vlen.p)
            free(buf_comp_large[i].i_vlen.p);
        if (buf_comp_large[i].s_vlen)
            free(buf_comp_large[i].s_vlen);
    }

    free(buf_comp);
    free(buf_comp_large);
    free(buf_int);
    free(buf_float_a);
    free(buf_double2d[0]);
    free(buf_double2d);
    free(buf_str);
    free(buf_vlen_i);
    free(buf_vlen_s);

    return 0;
}

/* add a single attribute */
int
add_attr(hid_t oid, const char *name, hid_t tid, hid_t sid, void *buf)
{
    hid_t aid;

    aid = H5Acreate(oid, name, tid, sid, H5P_DEFAULT, H5P_DEFAULT);
    if (aid < 0)
        return 0;

    H5Awrite(aid, tid, buf);

    H5Aclose(aid);

    return 1;
}

/*
    adds different types of attributes to an object.

    returns the number of attributes added to the objects.
 */
int
add_attrs(hid_t oid, int idx)
{
    char         name[32];
    int          i0, i1, i2, j, nattrs = 0;
    hid_t        aid, tid, tid1, sid;
    hvl_t        i_vlen[4];
    hobj_ref_t   ref;
    zipcode_t    cmp_data[4];
    unsigned int i          = 0xffffffff;
    long long    l          = -2147483647;
    float        f          = 123456789.987654321;
    double       d          = 987654321.123456789;
    char        *s[7]       = {"Parting", "is such", "sweeter", "sorrow."};
    float        f_array[4] = {1.0, 2.22, 3.333, 4.444};
    char        *s_vlen[4]  = {"Parting", "is such", "sweet", "sorrow."};
    hsize_t      dims1[1] = {1}, dims2[1] = {4}, dims3[2] = {3, 5};
    int          int3d[4][3][5];
    size_t       offset = 0;

    for (i0 = 0; i0 < 4; i0++) {
        i_vlen[i0].len = (i0 + 1);
        i_vlen[i0].p   = (int *)calloc(i_vlen[i0].len, sizeof(int));
        for (j = 0; j < i_vlen[i0].len; j++)
            ((int *)i_vlen[i0].p)[j] = i0 * 100 + j;
        for (i1 = 0; i1 < 3; i1++) {
            for (i2 = 0; i2 < 5; i2++)
                int3d[i0][i1][i2] = i0 * i1 - i1 * i2 + i0 * i2;
        }
    }

    cmp_data[0].zipcode = 01001;
    cmp_data[0].city    = "Agawam, Massachusetts";
    cmp_data[1].zipcode = 99950;
    cmp_data[1].city    = "Ketchikan, Alaska";
    cmp_data[2].zipcode = 00501;
    cmp_data[2].city    = "Holtsville, New York";
    cmp_data[3].zipcode = 61820;
    cmp_data[3].city    = "Champaign, Illinois";

    /* 1 scalar point */
    sid = H5Screate(H5S_SCALAR);
    snprintf(name, sizeof(name), "%05d scalar int", idx);
    nattrs += add_attr(oid, name, H5T_NATIVE_UINT, sid, &i);
    snprintf(name, sizeof(name), "%05d scalar ulong", idx);
    nattrs += add_attr(oid, name, H5T_NATIVE_INT64, sid, &l);
    snprintf(name, sizeof(name), "%05d scalar str", idx);
    tid = H5Tcopy(H5T_C_S1);
    H5Tset_size(tid, H5T_VARIABLE);
    nattrs += add_attr(oid, name, tid, sid, &s[2]);
    H5Tclose(tid);
    H5Sclose(sid);

    /* 4 single point */
    sid = H5Screate_simple(1, dims1, NULL);
    H5Rcreate(&ref, oid, ".", H5R_OBJECT, (hid_t)-1);
    snprintf(name, sizeof(name), "%05d single float", idx);
    nattrs += add_attr(oid, name, H5T_NATIVE_FLOAT, sid, &f);
    snprintf(name, sizeof(name), "%05d single double", idx);
    nattrs += add_attr(oid, name, H5T_NATIVE_DOUBLE, sid, &d);
    snprintf(name, sizeof(name), "%05d single obj_ref", idx);
    nattrs += add_attr(oid, name, H5T_STD_REF_OBJ, sid, &ref);
    H5Sclose(sid);

    /* 7 fixed length 1D array */
    sid = H5Screate_simple(1, dims1, NULL);
    tid = H5Tarray_create(H5T_NATIVE_FLOAT, 1, dims2);
    snprintf(name, sizeof(name), "%05d array float", idx);
    nattrs += add_attr(oid, name, tid, sid, &f_array[0]);
    H5Tclose(tid);
    tid = H5Tcopy(H5T_C_S1);
    H5Tset_size(tid, strlen(s[0]) + 1);
    tid1 = H5Tarray_create(tid, 1, dims2);
    snprintf(name, sizeof(name), "%05d array str", idx);
    nattrs += add_attr(oid, name, tid1, sid, s);
    H5Tclose(tid1);
    H5Tclose(tid);
    H5Sclose(sid);

    /* 9 fixed length 2D int arrays */
    sid = H5Screate_simple(1, dims2, NULL);
    tid = H5Tarray_create(H5T_NATIVE_INT, 2, dims3);
    snprintf(name, sizeof(name), "%05d array int 2D", idx);
    nattrs += add_attr(oid, name, tid, sid, int3d[0][0]);
    H5Tclose(tid);
    H5Sclose(sid);

    /* 10 variable length arrays */
    sid = H5Screate_simple(1, dims2, NULL);
    tid = H5Tcopy(H5T_C_S1);
    H5Tset_size(tid, H5T_VARIABLE);
    snprintf(name, sizeof(name), "%05d vlen strings", idx);
    nattrs += add_attr(oid, name, tid, sid, s_vlen);
    H5Tclose(tid);
    tid = H5Tvlen_create(H5T_NATIVE_INT);
    ;
    snprintf(name, sizeof(name), "%05d vlen int array", idx);
    nattrs += add_attr(oid, name, tid, sid, i_vlen);
    H5Tclose(tid);
    H5Sclose(sid);

    /* 12 compound data */
    sid  = H5Screate_simple(1, dims2, NULL);
    tid  = H5Tcreate(H5T_COMPOUND, sizeof(zipcode_t));
    tid1 = H5Tcopy(H5T_C_S1);
    H5Tset_size(tid1, H5T_VARIABLE);
    H5Tinsert(tid, "zip code", 0, H5T_NATIVE_INT);
    offset += sizeof(H5T_NATIVE_INT);
    H5Tinsert(tid, "City", offset, tid1);
    offset += sizeof(char *);
    snprintf(name, sizeof(name), "%05d compound data", idx);
    nattrs += add_attr(oid, name, tid, sid, cmp_data);
    H5Tclose(tid1);
    H5Tclose(tid);
    H5Sclose(sid);

    for (i0 = 0; i0 < 4; i0++)
        free(i_vlen[i0].p);

    return nattrs;
}
