path: root/tools/src/h5repack/h5repack.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * 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://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "H5private.h"
#include "h5repack.h"
#include "h5tools.h"
#include "h5tools_utils.h"

/*-------------------------------------------------------------------------
 * File: h5repack.c
 * Purpose: Public API functions
 *-------------------------------------------------------------------------
 */

static int check_options(pack_opt_t *options);
static int check_objects(const char* fname, pack_opt_t *options);
static const char* get_sfilter(H5Z_filter_t filtn);
static int have_request(pack_opt_t *options);

/*-------------------------------------------------------------------------
 * Function: h5repack
 *
 * Purpose: locate all high-level HDF5 objects in the file
 *  and compress/chunk them using options
 *
 * Algorithm: 2 traversals are made to the file; the 1st builds a list of
 *  the objects, the 2nd makes a copy of them, using the options;
 *  the reason for the 1st traversal is to check for invalid
 *  object name requests
 *
 * Return: 0, ok, -1, fail
 *
 * Programmer: pvn@ncsa.uiuc.edu
 *
 * Date: September, 22, 2003
 *
 *-------------------------------------------------------------------------
 */
int h5repack(const char* infile, const char* outfile, pack_opt_t *options) {
    /* check input */
    if (check_options(options) < 0)
        return -1;

    /* check for objects in input that are in the file */
    if (check_objects(infile, options) < 0)
        return -1;

    /* copy the objects  */
    if (copy_objects(infile, outfile, options) < 0)
        return -1;

    return 0;
}

/*-------------------------------------------------------------------------
 * Function: h5repack_init
 *
 * Purpose: initialize options
 *
 * Return: 0, ok, -1, fail
 *
 *-------------------------------------------------------------------------
 */
int
h5repack_init(pack_opt_t *options, int verbose, hbool_t latest)
{
    int k, n;

    HDmemset(options, 0, sizeof(pack_opt_t));
    options->min_comp = 0;
    options->verbose = verbose;
    options->latest = latest;
    options->layout_g = H5D_LAYOUT_ERROR;

    for (n = 0; n < H5_REPACK_MAX_NFILTERS; n++) {
        options->filter_g[n].filtn = -1;
        options->filter_g[n].cd_nelmts = 0;
        for (k = 0; k < CD_VALUES; k++)
            options->filter_g[n].cd_values[k] = 0;
    }

    return (options_table_init(&(options->op_tbl)));
}

/*-------------------------------------------------------------------------
 * Function: h5repack_end
 *
 * Purpose: free options table
 *
 *-------------------------------------------------------------------------
 */

int h5repack_end(pack_opt_t *options) {
    return options_table_free(options->op_tbl);
}

/*-------------------------------------------------------------------------
 * Function: h5repack_addfilter
 *
 * Purpose: add a compression -f option to table
 *   Example: -f dset:GZIP=6
 *
 * Return: 0, ok, -1, fail
 *
 *-------------------------------------------------------------------------
 */
int
h5repack_addfilter(const char* str, pack_opt_t *options)
{
    obj_list_t   *obj_list = NULL; /* one object list for the -f and -l option entry */
    filter_info_t filter;          /* filter info for the current -f option entry */
    unsigned      n_objs;          /* number of objects in the current -f or -l option entry */
    int           is_glb;          /* is the filter global */

    /* parse the -f option */
    if (NULL == (obj_list = parse_filter(str, &n_objs, &filter, options, &is_glb)))
        return -1;

    /* if it applies to all objects */
    if (is_glb) {
        int n;

        n = options->n_filter_g++; /* increase # of global filters */
        if (options->n_filter_g > H5_REPACK_MAX_NFILTERS) {
            error_msg("maximum number of filters exceeded for <%s>\n", str);
            HDfree(obj_list);
            return -1;
        }

        options->filter_g[n] = filter;
    }
    else
        options_add_filter(obj_list, n_objs, filter, options->op_tbl);

    HDfree(obj_list);
    return 0;
}

/*-------------------------------------------------------------------------
 * Function: h5repack_addlayout
 *
 * Purpose: add a layout option
 *
 * Return: 0, ok, -1, fail
 *
 *-------------------------------------------------------------------------
 */
int
h5repack_addlayout(const char* str, pack_opt_t *options)
{
    obj_list_t *obj_list = NULL; /*one object list for the -t and -c option entry */
    unsigned    n_objs;          /*number of objects in the current -t or -c option entry */
    pack_info_t pack;            /*info about layout to extract from parse */
    int         j;
    int         ret_value = -1;

    init_packobject(&pack);

    if (options->all_layout == 1) {
        error_msg( "invalid layout input: 'all' option is present with other objects <%s>\n", str);
        return ret_value;
    }

    /* parse the layout option */
    obj_list = parse_layout(str, &n_objs, &pack, options);
    if (obj_list) {
        /* set layout option */
        options->layout_g = pack.layout;

        /* no individual dataset specified */
        if (options->all_layout == 1) {
            if (pack.layout == H5D_CHUNKED) {
                /* -2 means the NONE option, remove chunking
                 and set the global layout to contiguous */
                if (pack.chunk.rank == -2)
                    options->layout_g = H5D_CONTIGUOUS;
                /* otherwise set the global chunking type */
                else {
                    options->chunk_g.rank = pack.chunk.rank;
                    for (j = 0; j < pack.chunk.rank; j++)
                        options->chunk_g.chunk_lengths[j] = pack.chunk.chunk_lengths[j];
                }
            }
        }

        /* individual dataset specified */
        if (options->all_layout == 0)
            ret_value = options_add_layout(obj_list, n_objs, &pack, options->op_tbl);

        HDfree(obj_list);
        ret_value = 0;
    }

    return ret_value;
}

/* Note: The below copy_named_datatype(), named_datatype_free(), copy_attr()
 * were located in h5repack_copy.c as static prior to bugfix1726.
 * Made shared functions as copy_attr() was needed in h5repack_refs.c.
 * However copy_attr() may be obsoleted when H5Acopy is available and put back
 * others to static in h5repack_copy.c.
 */
/*-------------------------------------------------------------------------
 * Function: copy_named_datatype
 *
 * Purpose: Copies the specified datatype anonymously, and returns an open
 *          id for that datatype in the output file.  The first time this
 *          is called it scans every named datatype in travt into a
 *          private stack, afterwards it simply scans that stack.  The id
 *          returned must be closed after it is no longer needed.
 *          named_datatype_free must be called before the program exits
 *          to free the stack.
 *
 * Programmer: Neil Fortner
 *
 * Date: April 14, 2009
 *
 *-------------------------------------------------------------------------
 */
hid_t copy_named_datatype(hid_t type_in, hid_t fidout,
        named_dt_t **named_dt_head_p, trav_table_t *travt, pack_opt_t *options) {
    named_dt_t *dt = *named_dt_head_p; /* Stack pointer */
    named_dt_t *dt_ret = NULL;         /* Datatype to return */
    H5O_info_t  oinfo;                 /* Object info of input dtype */
    hid_t ret_value = -1;              /* The identifier of the named dtype in the out file */

    if (H5Oget_info(type_in, &oinfo) < 0)
        goto done;

    if (*named_dt_head_p) {
        /* Stack already exists, search for the datatype */
        while (dt && dt->addr_in != oinfo.addr)
            dt = dt->next;

        dt_ret = dt;
    }
    else {
        /* Create the stack */
        size_t i;

        for (i = 0; i < travt->nobjs; i++) {
            if (travt->objs[i].type == H5TRAV_TYPE_NAMED_DATATYPE) {
                /* Push onto the stack */
                if (NULL == (dt = (named_dt_t *) HDmalloc(sizeof(named_dt_t)))) {
                    goto done;
                }
                dt->next = *named_dt_head_p;
                *named_dt_head_p = dt;

                /* Update the address and id */
                dt->addr_in = travt->objs[i].objno;
                dt->id_out = -1;

                /* Check if this type is the one requested */
                if (oinfo.addr == dt->addr_in) {
                    HDassert(!dt_ret);
                    dt_ret = dt;
                } /* end if */
            } /* end if */
        } /* end for */
    } /* end else */

    /* Handle the case that the requested datatype was not found.  This is
    * possible if the datatype was committed anonymously in the input file. */
    if (!dt_ret) {
        /* Push the new datatype onto the stack */
        if (NULL == (dt_ret = (named_dt_t *) HDmalloc(sizeof(named_dt_t)))) {
            goto done;
        }
        dt_ret->next = *named_dt_head_p;
        *named_dt_head_p = dt_ret;

        /* Update the address and id */
        dt_ret->addr_in = oinfo.addr;
        dt_ret->id_out = -1;
    } /* end if */

	/* If the requested datatype does not yet exist in the output file, copy it
	 * anonymously */
	if (dt_ret->id_out < 0) {
		if (options->use_native == 1)
			dt_ret->id_out = h5tools_get_native_type(type_in);
		else
			dt_ret->id_out = H5Tcopy(type_in);
		if (dt_ret->id_out < 0)
			goto done;
		if (H5Tcommit_anon(fidout, dt_ret->id_out, H5P_DEFAULT, H5P_DEFAULT) < 0)
			goto done;
	} /* end if */

    /* Set return value */
    ret_value = dt_ret->id_out;

    /* Increment the ref count on id_out, because the calling function will try
    * to close it */
    if(H5Iinc_ref(ret_value) < 0) {
        ret_value = -1;
    }

done:
    return (ret_value);
} /* end copy_named_datatype */

/*-------------------------------------------------------------------------
 * Function: named_datatype_free
 *
 * Purpose: Frees the stack of named datatypes.
 *
 * Programmer: Neil Fortner
 *
 * Date: April 14, 2009
 *
 *-------------------------------------------------------------------------
 */
int named_datatype_free(named_dt_t **named_dt_head_p, int ignore_err) {
    named_dt_t *dt = *named_dt_head_p;
    int         ret_value = -1;

    while (dt) {
        /* Pop the datatype off the stack and free it */
        if (H5Tclose(dt->id_out) < 0 && !ignore_err)
            goto done;
        dt = dt->next;
        HDfree(*named_dt_head_p);
        *named_dt_head_p = dt;
    } /* end while */

    ret_value = 0;

done:
    return (ret_value);
} /* end named_datatype_free */

/*-------------------------------------------------------------------------
 * Function: copy_attr
 *
 * Purpose: copy attributes located in LOC_IN, which is obtained either from
 * loc_id = H5Gopen2( fid, name);
 * loc_id = H5Dopen2( fid, name);
 * loc_id = H5Topen2( fid, name);
 *
 * Return: 0, ok, -1 no
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *
 * Date: October, 28, 2003
 *
 *-------------------------------------------------------------------------
 */
int
copy_attr(hid_t loc_in, hid_t loc_out, named_dt_t **named_dt_head_p,
        trav_table_t *travt, pack_opt_t *options)
{
    int         ret_value = 0; /*no need to LEAVE() on ERROR: HERR_INIT(int, SUCCEED) */
    hid_t       attr_id = -1;  /* attr ID */
    hid_t       attr_out = -1; /* attr ID */
    hid_t       space_id = -1; /* space ID */
    hid_t       ftype_id = -1; /* file type ID */
    hid_t       wtype_id = -1; /* read/write type ID */
    size_t      msize;         /* size of type */
    void       *buf = NULL;    /* data buffer */
    hsize_t     nelmts;        /* number of elements in dataset */
    int         rank;          /* rank of dataset */
    htri_t      is_named;      /* Whether the datatype is named */
    hsize_t     dims[H5S_MAX_RANK];/* dimensions of dataset */
    char        name[255];
    H5O_info_t  oinfo;         /* object info */
    int         j;
    unsigned    u;
    hbool_t     is_ref = 0;
    H5T_class_t type_class = -1;

    if (H5Oget_info(loc_in, &oinfo) < 0)
        HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Oget_info failed");

    /*-------------------------------------------------------------------------
     * copy all attributes
     *-------------------------------------------------------------------------
     */
    for (u = 0; u < (unsigned) oinfo.num_attrs; u++) {
        /* open attribute */
        if ((attr_id = H5Aopen_by_idx(loc_in, ".", H5_INDEX_CRT_ORDER, H5_ITER_INC, (hsize_t) u, H5P_DEFAULT, H5P_DEFAULT)) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Aopen_by_idx failed");

        /* get name */
        if (H5Aget_name(attr_id, (size_t) 255, name) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Pclose failed");

        /* get the file datatype  */
        if ((ftype_id = H5Aget_type(attr_id)) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Aget_type failed");

        /* Check if the datatype is committed */
        if ((is_named = H5Tcommitted(ftype_id)) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Tcommitted failed");
        if (is_named && travt) {
            hid_t fidout;

            /* Create out file id */
            if ((fidout = H5Iget_file_id(loc_out)) < 0)
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Iget_file_id failed");

            /* Copy named dt */
            if ((wtype_id = copy_named_datatype(ftype_id, fidout, named_dt_head_p, travt, options)) < 0) {
                H5Fclose(fidout);
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "copy_named_datatype failed");
            } /* end if */

            if (H5Fclose(fidout) < 0)
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Fclose failed");
        } /* end if */
        else {
            if (options->use_native == 1)
                wtype_id = h5tools_get_native_type(ftype_id);
            else
                wtype_id = H5Tcopy(ftype_id);
        } /* end else */

        /* get the dataspace handle  */
        if ((space_id = H5Aget_space(attr_id)) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Aget_space failed");

        /* get dimensions  */
        if ((rank = H5Sget_simple_extent_dims(space_id, dims, NULL)) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Sget_simple_extent_dims failed");

        nelmts = 1;
        for (j = 0; j < rank; j++)
            nelmts *= dims[j];

        if ((msize = H5Tget_size(wtype_id)) == 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Tget_size failed");

        /*-------------------------------------------------------------------------
         * object references are a special case. We cannot just copy the buffers,
         * but instead we recreate the reference.
         * This is done on a second sweep of the file that just copies the referenced
         * objects at copy_refs_attr()
         *-------------------------------------------------------------------------
         */
        type_class = H5Tget_class(wtype_id);
        is_ref = (type_class == H5T_REFERENCE);
        if (type_class == H5T_VLEN || type_class == H5T_ARRAY) {
            hid_t base_type = -1;

            base_type = H5Tget_super(ftype_id);
            is_ref = (is_ref || (H5Tget_class(base_type) == H5T_REFERENCE));
            H5Tclose(base_type);
        }

        if (type_class == H5T_COMPOUND) {
            int nmembers = H5Tget_nmembers(wtype_id);

            for (j = 0; j < nmembers; j++) {
                hid_t mtid = H5Tget_member_type(wtype_id, (unsigned) j);
                H5T_class_t mtclass = H5Tget_class(mtid);
                H5Tclose(mtid);

                if (mtclass == H5T_REFERENCE) {
                    is_ref = 1;
                    break;
                }
            } /* for (j=0; i<nmembers; j++) */
        } /* if (type_class == H5T_COMPOUND) */

        if (is_ref) {
            ; /* handled by copy_refs_attr() */
        }
        else {
            /*-------------------------------------------------------------------------
             * read to memory
             *-------------------------------------------------------------------------
             */

            buf = (void *) HDmalloc((size_t)(nelmts * msize));
            if (buf == NULL) {
                error_msg("h5repack", "cannot read into memory\n");
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "HDmalloc failed");
            } /* end if */
            if (H5Aread(attr_id, wtype_id, buf) < 0)
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Aread failed");

            /*-------------------------------------------------------------------------
             * copy
             *-------------------------------------------------------------------------
             */

            if ((attr_out = H5Acreate2(loc_out, name, wtype_id, space_id, H5P_DEFAULT, H5P_DEFAULT)) < 0)
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Acreate2 failed");
            if (H5Awrite(attr_out, wtype_id, buf) < 0)
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Awrite failed");

            /*close*/
            if (H5Aclose(attr_out) < 0)
                HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Aclose failed");

            /* Check if we have VL data and string in the attribute's  datatype that must
             * be reclaimed */
            if (TRUE == h5tools_detect_vlen(wtype_id))
                H5Dvlen_reclaim(wtype_id, space_id, H5P_DEFAULT, buf);
            HDfree(buf);
            buf = NULL;
        } /*H5T_REFERENCE*/

        if (options->verbose)
            printf(FORMAT_OBJ_ATTR, "attr", name);

        /*-------------------------------------------------------------------------
         * close
         *-------------------------------------------------------------------------
         */

        if (H5Tclose(ftype_id) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Tclose failed");
        if (H5Tclose(wtype_id) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Tclose failed");
        if (H5Sclose(space_id) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Sclose failed");
        if (H5Aclose(attr_id) < 0)
            HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "H5Aclose failed");
    } /* u */

    return 0;

done:
    H5E_BEGIN_TRY {
        if (buf) {
            /* Check if we have VL data and string in the attribute's  datatype that must
            * be reclaimed */
            if (TRUE == h5tools_detect_vlen(wtype_id))
                H5Dvlen_reclaim(wtype_id, space_id, H5P_DEFAULT, buf);

            /* Free buf */
            HDfree(buf);
        } /* end if */

        H5Tclose(ftype_id);
        H5Tclose(wtype_id);
        H5Sclose(space_id);
        H5Aclose(attr_id);
        H5Aclose(attr_out);
    } H5E_END_TRY;

    return ret_value;
} /* end copy_attr() */

/*-------------------------------------------------------------------------
 * Function: check_options
 *
 * Purpose: print options, checks for invalid options
 *
 * Return: void, return -1 on error
 *
 * Programmer: pvn@ncsa.uiuc.edu
 *
 * Date: September, 22, 2003
 *-------------------------------------------------------------------------
 */
static int check_options(pack_opt_t *options) {
    unsigned int i;
    int          k, j, has_cp = 0, has_ck = 0;
    char         slayout[30];

    /*-------------------------------------------------------------------------
    * objects to layout
    *-------------------------------------------------------------------------
    */
    if (options->verbose && have_request(options) /* only print if requested */) {
        printf("Objects to modify layout are...\n");
        if (options->all_layout == 1) {
            switch (options->layout_g) {
            case H5D_COMPACT:
                strcpy(slayout, "compact");
                break;
            case H5D_CONTIGUOUS:
                strcpy(slayout, "contiguous");
                break;
            case H5D_CHUNKED:
                strcpy(slayout, "chunked");
                break;
            case H5D_VIRTUAL:
                strcpy(slayout, "virtual");
                break;
            case H5D_LAYOUT_ERROR:
            case H5D_NLAYOUTS:
                error_msg("invalid layout\n");
                return -1;
            default:
                strcpy(slayout, "invalid layout\n");
                return -1;
            }
            printf(" Apply %s layout to all\n", slayout);
            if (H5D_CHUNKED == options->layout_g) {
                printf("with dimension [");
                for (j = 0; j < options->chunk_g.rank; j++)
                    printf("%d ", (int) options->chunk_g.chunk_lengths[j]);
                printf("]\n");
            }
        }
    }/* verbose */

    for (i = 0; i < options->op_tbl->nelems; i++) {
        char* name = options->op_tbl->objs[i].path;

        if (options->op_tbl->objs[i].chunk.rank > 0) {
            if (options->verbose) {
                printf(" <%s> with chunk size ", name);
                for (k = 0; k < options->op_tbl->objs[i].chunk.rank; k++)
                    printf("%d ",
                            (int) options->op_tbl->objs[i].chunk.chunk_lengths[k]);
                printf("\n");
            }
            has_ck = 1;
        }
        else if (options->op_tbl->objs[i].chunk.rank == -2) {
            if (options->verbose)
                printf(" <%s> %s\n", name, "NONE (contigous)");
            has_ck = 1;
        }
    }

    if (options->all_layout == 1 && has_ck) {
        error_msg(
                "invalid chunking input: 'all' option\
                            is present with other objects\n");
        return -1;
    }

    /*-------------------------------------------------------------------------
    * objects to filter
    *-------------------------------------------------------------------------
    */

    if (options->verbose && have_request(options) /* only print if requested */) {
        printf("Objects to apply filter are...\n");
        if (options->all_filter == 1) {
            for (k = 0; k < options->n_filter_g; k++) {
                H5Z_filter_t filtn = options->filter_g[k].filtn;
                switch (filtn) {
                case H5Z_FILTER_NONE:
                    printf(" Uncompress all\n");
                    break;
                case H5Z_FILTER_SHUFFLE:
                case H5Z_FILTER_FLETCHER32:
                    printf(" All with %s\n", get_sfilter(filtn));
                    break;
                case H5Z_FILTER_SZIP:
                case H5Z_FILTER_DEFLATE:
                    printf(" All with %s, parameter %d\n", get_sfilter(filtn),
                            options->filter_g[k].cd_values[0]);
                    break;
                default:
                    printf(" User Defined %d\n", filtn);
                    break;
                } /* k */
            };
        }
    } /* verbose */

    for (i = 0; i < options->op_tbl->nelems; i++) {
        pack_info_t pack = options->op_tbl->objs[i];
        char* name = pack.path;

        for (j = 0; j < pack.nfilters; j++) {
            if (options->verbose) {
                printf(" <%s> with %s filter\n", name,
                        get_sfilter(pack.filter[j].filtn));
            }

            has_cp = 1;

        } /* j */
    } /* i */

    if (options->all_filter == 1 && has_cp) {
        error_msg(
                "invalid compression input: 'all' option\
                            is present with other objects\n");
        return -1;
    }

    /*-------------------------------------------------------------------------
    * check options for the latest format
    *-------------------------------------------------------------------------
    */

    if (options->grp_compact < 0) {
        error_msg(
                "invalid maximum number of links to store as header messages\n");
        return -1;
    }
    if (options->grp_indexed < 0) {
        error_msg(
                "invalid minimum number of links to store in the indexed format\n");
        return -1;
    }
    if (options->grp_indexed > options->grp_compact) {
        error_msg(
                "minimum indexed size is greater than the maximum compact size\n");
        return -1;
    }
    for (i = 0; i < 8; i++) {
        if (options->msg_size[i] < 0) {
            error_msg("invalid shared message size\n");
            return -1;
        }
    }

    /*--------------------------------------------------------------------------------
    * verify new user userblock options; file name must be present
    *---------------------------------------------------------------------------------
    */
    if (options->ublock_filename != NULL && options->ublock_size == 0) {
        if (options->verbose) {
            printf(
                    "Warning: user block size missing for file %s. Assigning a default size of 1024...\n",
                    options->ublock_filename);
            options->ublock_size = 1024;
        }
    }

    if (options->ublock_filename == NULL && options->ublock_size != 0) {
        error_msg("file name missing for user block\n",
                options->ublock_filename);
        return -1;
    }

    /*--------------------------------------------------------------------------------
    * verify alignment options; threshold is zero default but alignment not
    *---------------------------------------------------------------------------------
    */

    if (options->alignment == 0 && options->threshold != 0) {
        error_msg("alignment for H5Pset_alignment missing\n");
        return -1;
    }

    return 0;
}

/*-------------------------------------------------------------------------
 * Function: check_objects
 *
 * Purpose: locate all HDF5 objects in the file and compare with user
 *  supplied list
 *
 * Return: 0, ok, -1 no
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *
 * Date: September, 23, 2003
 *
 *-------------------------------------------------------------------------
 */
static int check_objects(const char* fname, pack_opt_t *options) {
    hid_t         fid;
    unsigned int  i;
    trav_table_t *travt = NULL;

    /* nothing to do */
    if (options->op_tbl->nelems == 0)
        return 0;

    /*-------------------------------------------------------------------------
    * open the file
    *-------------------------------------------------------------------------
    */
    if ((fid = h5tools_fopen(fname, H5F_ACC_RDONLY, H5P_DEFAULT, NULL, NULL, 0))
            < 0) {
        printf("<%s>: %s\n", fname, H5FOPENERROR);
        return -1;
    }

    /*-------------------------------------------------------------------------
    * get the list of objects in the file
    *-------------------------------------------------------------------------
    */

    /* init table */
    trav_table_init(&travt);

    /* get the list of objects in the file */
    if (h5trav_gettable(fid, travt) < 0)
        goto out;

    /*-------------------------------------------------------------------------
    * compare with user supplied list
    *-------------------------------------------------------------------------
    */

    if (options->verbose)
        printf("Opening file <%s>. Searching for objects to modify...\n",
                fname);

    for (i = 0; i < options->op_tbl->nelems; i++) {
        char* name = options->op_tbl->objs[i].path;
        if (options->verbose)
            printf(" <%s>", name);

        /* the input object names are present in the file and are valid */
        if (h5trav_getindext(name, travt) < 0) {
            error_msg("%s Could not find <%s> in file <%s>. Exiting...\n",
                    (options->verbose ? "\n" : ""), name, fname);
            goto out;
        }
        if (options->verbose)
            printf("...Found\n");

        /* check for extra filter conditions */
        switch (options->op_tbl->objs[i].filter->filtn) {
        /* chunk size must be smaller than pixels per block */
        case H5Z_FILTER_SZIP:
            {
                int j;
                hsize_t csize = 1;
                unsigned ppb = options->op_tbl->objs[i].filter->cd_values[0];
                hsize_t dims[H5S_MAX_RANK];
                int rank;
                hid_t did;
                hid_t sid;

                if (options->op_tbl->objs[i].chunk.rank > 0) {
                    rank = options->op_tbl->objs[i].chunk.rank;
                    for (j = 0; j < rank; j++)
                        csize *= options->op_tbl->objs[i].chunk.chunk_lengths[j];
                }
                else {
                    if ((did = H5Dopen2(fid, name, H5P_DEFAULT)) < 0)
                        goto out;
                    if ((sid = H5Dget_space(did)) < 0)
                        goto out;
                    if ((rank = H5Sget_simple_extent_ndims(sid)) < 0)
                        goto out;
                    HDmemset(dims, 0, sizeof dims);
                    if (H5Sget_simple_extent_dims(sid, dims, NULL) < 0)
                        goto out;
                    for (j = 0; j < rank; j++)
                        csize *= dims[j];
                    if (H5Sclose(sid) < 0)
                        goto out;
                    if (H5Dclose(did) < 0)
                        goto out;
                }

                if (csize < ppb) {
                    printf(
                            " <warning: SZIP settins, chunk size is smaller than pixels per block>\n");
                    goto out;
                }
            }
            break;
        default:
            break;
        }
    } /* i */

    /*-------------------------------------------------------------------------
    * close
    *-------------------------------------------------------------------------
    */
    H5Fclose(fid);
    trav_table_free(travt);
    return 0;

out:
    H5Fclose(fid);
    trav_table_free(travt);
    return -1;
}

/*-------------------------------------------------------------------------
 * Function: have_request
 *
 * Purpose: check if a filter or layout was requested
 *
 * Return: 1 yes, 0 no
 *
 * Date: May, 24, 2007
 *
 *-------------------------------------------------------------------------
 */
static int have_request(pack_opt_t *options) {

    if (options->all_filter || options->all_layout || options->op_tbl->nelems)
        return 1;

    return 0;

}

/*-------------------------------------------------------------------------
 * Function: get_sfilter
 *
 * Purpose: return the filter as a string name
 *
 * Return: name of filter, exit on error
 *
 *-------------------------------------------------------------------------
 */

static const char* get_sfilter(H5Z_filter_t filtn) {
    if (filtn == H5Z_FILTER_NONE)
        return "NONE";
    else if (filtn == H5Z_FILTER_DEFLATE)
        return "GZIP";
    else if (filtn == H5Z_FILTER_SZIP)
        return "SZIP";
    else if (filtn == H5Z_FILTER_SHUFFLE)
        return "SHUFFLE";
    else if (filtn == H5Z_FILTER_FLETCHER32)
        return "FLETCHER32";
    else if (filtn == H5Z_FILTER_NBIT)
        return "NBIT";
    else if (filtn == H5Z_FILTER_SCALEOFFSET)
        return "SOFF";
    else
        return "UD";
}