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path: root/src/H5FAdblock.c

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src/H5FAdblock.c

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/****************/
/* Module Setup */
/****************/

#include "H5Rmodule.h" /* This source code file is part of the H5R module */

/***********/
/* Headers */
/***********/
#include "H5private.h"   /* Generic Functions                        */
#include "H5ACprivate.h" /* Metadata cache                           */
#include "H5CXprivate.h" /* API Contexts                             */
#include "H5Dprivate.h"  /* Datasets                                 */
#include "H5Eprivate.h"  /* Error handling                           */
#include "H5Gprivate.h"  /* Groups                                   */
#include "H5HGprivate.h" /* Global Heaps                             */
#include "H5Iprivate.h"  /* IDs                                      */
#include "H5MMprivate.h" /* Memory management                        */
#include "H5Oprivate.h"  /* Object headers                           */
#include "H5Rpkg.h"      /* References                               */
#include "H5Sprivate.h"  /* Dataspaces                               */
#include "H5Tprivate.h"  /* Datatypes                                */

#include "H5VLnative_private.h" /* Native VOL connector                     */

/****************/
/* Local Macros */
/****************/

#define H5R_MAX_STRING_LEN (1 << 16) /* Max encoded string length    */

/* Encode macro */
#define H5R_ENCODE(func, val, buf, buf_size, actual, m)                                                      \
    do {                                                                                                     \
        size_t __nalloc = buf_size;                                                                          \
        if (func(val, buf, &__nalloc) < 0)                                                                   \
            HGOTO_ERROR(H5E_REFERENCE, H5E_CANTENCODE, FAIL, m)                                              \
        if (buf && buf_size >= __nalloc) {                                                                   \
            buf += __nalloc;                                                                                 \
            buf_size -= __nalloc;                                                                            \
        }                                                                                                    \
        actual += __nalloc;                                                                                  \
    } while (0)

#define H5R_ENCODE_VAR(func, var, size, buf, buf_size, actual, m)                                            \
    do {                                                                                                     \
        size_t __nalloc = buf_size;                                                                          \
        if (func(var, size, buf, &__nalloc) < 0)                                                             \
            HGOTO_ERROR(H5E_REFERENCE, H5E_CANTENCODE, FAIL, m)                                              \
        if (buf && buf_size >= __nalloc) {                                                                   \
            p += __nalloc;                                                                                   \
            buf_size -= __nalloc;                                                                            \
        }                                                                                                    \
        actual += __nalloc;                                                                                  \
    } while (0)

/* Decode macro */
#define H5R_DECODE(func, val, buf, buf_size, actual, m)                                                      \
    do {                                                                                                     \
        size_t __nbytes = buf_size;                                                                          \
        if (func(buf, &__nbytes, val) < 0)                                                                   \
            HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDECODE, FAIL, m)                                              \
        buf += __nbytes;                                                                                     \
        buf_size -= __nbytes;                                                                                \
        actual += __nbytes;                                                                                  \
    } while (0)

#define H5R_DECODE_VAR(func, var, size, buf, buf_size, actual, m)                                            \
    do {                                                                                                     \
        size_t __nbytes = buf_size;                                                                          \
        if (func(buf, &__nbytes, var, size) < 0)                                                             \
            HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDECODE, FAIL, m)                                              \
        p += __nbytes;                                                                                       \
        buf_size -= __nbytes;                                                                                \
        actual += __nbytes;                                                                                  \
    } while (0)

/* Debug */
#ifdef H5R_DEBUG
#define H5R_LOG_DEBUG(...)                                                                                   \
    do {                                                                                                     \
        HDfprintf(stdout, " # %s(): ", __func__);                                                            \
        HDfprintf(stdout, __VA_ARGS__);                                                                      \
        HDfprintf(stdout, "\n");                                                                             \
        HDfflush(stdout);                                                                                    \
    } while (0)
static const char *
H5R__print_token(const H5O_token_t token)
{
    static char string[64];

    /* Print the raw token. */
    HDsnprintf(string, 64, "%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X",
               (unsigned char)token.__data[15], (unsigned char)token.__data[14],
               (unsigned char)token.__data[13], (unsigned char)token.__data[12],
               (unsigned char)token.__data[11], (unsigned char)token.__data[10],
               (unsigned char)token.__data[9], (unsigned char)token.__data[8], (unsigned char)token.__data[7],
               (unsigned char)token.__data[6], (unsigned char)token.__data[5], (unsigned char)token.__data[4],
               (unsigned char)token.__data[3], (unsigned char)token.__data[2], (unsigned char)token.__data[1],
               (unsigned char)token.__data[0]);

    return string;
}
#else
#define H5R_LOG_DEBUG(...)                                                                                   \
    do {                                                                                                     \
    } while (0)
#endif

/******************/
/* Local Typedefs */
/******************/

/********************/
/* Local Prototypes */
/********************/

static herr_t H5R__encode_obj_token(const H5O_token_t *obj_token, size_t token_size, unsigned char *buf,
                                    size_t *nalloc);
static herr_t H5R__decode_obj_token(const unsigned char *buf, size_t *nbytes, H5O_token_t *obj_token,
                                    uint8_t *token_size);
static herr_t H5R__encode_region(H5S_t *space, unsigned char *buf, size_t *nalloc);
static herr_t H5R__decode_region(const unsigned char *buf, size_t *nbytes, H5S_t **space_ptr);
static herr_t H5R__encode_string(const char *string, unsigned char *buf, size_t *nalloc);
static herr_t H5R__decode_string(const unsigned char *buf, size_t *nbytes, char **string_ptr);

/*********************/
/* Package Variables */
/*********************/

/*****************************/
/* Library Private Variables */
/*****************************/

/*******************/
/* Local Variables */
/*******************/

/*-------------------------------------------------------------------------
 * Function:    H5R_init
 *
 * Purpose:     Initialize the interface from some other layer.
 *
 * Return:      Success:        non-negative
 *              Failure:        negative
 *-------------------------------------------------------------------------
 */
herr_t
H5R_init(void)
{
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check, if assert fails, H5R_REF_BUF_SIZE must be increased */
    HDcompile_assert(sizeof(H5R_ref_priv_t) <= H5R_REF_BUF_SIZE);

    FUNC_LEAVE_NOAPI(ret_value)
}

/*-------------------------------------------------------------------------
 * Function:    H5R__create_object
 *
 * Purpose:     Creates an object reference
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5R__create_object(const H5O_token_t *obj_token, size_t token_size, H5R_ref_priv_t *ref)
{
    size_t encode_size;
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(ref);

    /* Create new reference */
    ref->info.obj.filename = NULL;
    ref->loc_id            = H5I_INVALID_HID;
    ref->type              = (uint8_t)H5R_OBJECT2;
    if (H5R__set_obj_token(ref, obj_token, token_size) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, FAIL, "unable to set object token")

    /* Cache encoding size (assume no external reference) */
    if (H5R__encode(NULL, ref, NULL, &encode_size, 0) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTENCODE, FAIL, "unable to determine encoding size")
    ref->encode_size = (uint32_t)encode_size;

    H5R_LOG_DEBUG("Created object reference, %d, filename=%s, obj_addr=%s, encode size=%u",
                  (int)sizeof(H5R_ref_priv_t), ref->info.obj.filename, H5R__print_token(ref->info.obj.token),
                  ref->encode_size);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__create_object() */

/*-------------------------------------------------------------------------
 * Function:    H5R__create_region
 *
 * Purpose:     Creates a region reference
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5R__create_region(const H5O_token_t *obj_token, size_t token_size, H5S_t *space, H5R_ref_priv_t *ref)
{
    size_t encode_size;
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(space);
    HDassert(ref);

    /* Create new reference */
    ref->info.obj.filename = NULL;
    if (NULL == (ref->info.reg.space = H5S_copy(space, FALSE, TRUE)))
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCOPY, FAIL, "unable to copy dataspace")

    ref->loc_id = H5I_INVALID_HID;
    ref->type   = (uint8_t)H5R_DATASET_REGION2;
    if (H5R__set_obj_token(ref, obj_token, token_size) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, FAIL, "unable to set object token")

    /* Cache encoding size (assume no external reference) */
    if (H5R__encode(NULL, ref, NULL, &encode_size, 0) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTENCODE, FAIL, "unable to determine encoding size")
    ref->encode_size = (uint32_t)encode_size;

    H5R_LOG_DEBUG("Created region reference, %d, filename=%s, obj_addr=%s, encode size=%u",
                  (int)sizeof(H5R_ref_priv_t), ref->info.obj.filename, H5R__print_token(ref->info.obj.token),
                  ref->encode_size);

done:
    if (ret_value < 0)
        if (ref->info.reg.space) {
            H5S_close(ref->info.reg.space);
            ref->info.reg.space = NULL;
        } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5R__create_region */

/*-------------------------------------------------------------------------
 * Function:    H5R__create_attr
 *
 * Purpose:     Creates an attribute reference
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5R__create_attr(const H5O_token_t *obj_token, size_t token_size, const char *attr_name, H5R_ref_priv_t *ref)
{
    size_t encode_size;
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(attr_name);
    HDassert(ref);

    /* Make sure that attribute name is not longer than supported encode size */
    if (HDstrlen(attr_name) > H5R_MAX_STRING_LEN)
        HGOTO_ERROR(H5E_REFERENCE, H5E_ARGS, FAIL, "attribute name too long (%d > %d)",
                    (int)HDstrlen(attr_name), H5R_MAX_STRING_LEN)

    /* Create new reference */
    ref->info.obj.filename = NULL;
    if (NULL == (ref->info.attr.name = HDstrdup(attr_name)))
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCOPY, FAIL, "Cannot copy attribute name")

    ref->loc_id = H5I_INVALID_HID;
    ref->type   = (uint8_t)H5R_ATTR;
    if (H5R__set_obj_token(ref, obj_token, token_size) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, FAIL, "unable to set object token")

    /* Cache encoding size (assume no external reference) */
    if (H5R__encode(NULL, ref, NULL, &encode_size, 0) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTENCODE, FAIL, "unable to determine encoding size")
    ref->encode_size = (uint32_t)encode_size;

    H5R_LOG_DEBUG("Created attribute reference, %d, filename=%s, obj_addr=%s, attr name=%s, encode size=%u",
                  (int)sizeof(H5R_ref_priv_t), ref->info.obj.filename, H5R__print_token(ref->info.obj.token),
                  ref->info.attr.name, ref->encode_size);

done:
    if (ret_value < 0) {
        H5MM_xfree(ref->info.attr.name);
        ref->info.attr.name = NULL;
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5R__create_attr */

/*-------------------------------------------------------------------------
 * Function:    H5R__destroy
 *
 * Purpose:     Destroy a reference
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5R__destroy(H5R_ref_priv_t *ref)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(ref != NULL);

    H5R_LOG_DEBUG("Destroying reference, filename=%s, obj_addr=%s, encode size=%u", ref->info.obj.filename,
                  H5R__print_token(ref->info.obj.token), ref->encode_size);

    H5MM_xfree(ref->info.obj.filename);
    ref->info.obj.filename = NULL;

    switch (ref->type) {
        case H5R_OBJECT2:
            break;

        case H5R_DATASET_REGION2:
            if (H5S_close(ref->info.reg.space) < 0)
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTFREE, FAIL, "Cannot close dataspace")
            ref->info.reg.space = NULL;
            break;

        case H5R_ATTR:
            H5MM_xfree(ref->info.attr.name);
            ref->info.attr.name = NULL;
            break;

        case H5R_OBJECT1:
        case H5R_DATASET_REGION1:
            break;
        case H5R_BADTYPE:
        case H5R_MAXTYPE:
            HDassert("invalid reference type" && 0);
            HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (invalid reference type)")

        default:
            HDassert("unknown reference type" && 0);
            HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)")
    } /* end switch */

    /* Decrement refcount of attached loc_id */
    if (ref->type && (ref->loc_id != H5I_INVALID_HID)) {
        if (ref->app_ref) {
            if (H5I_dec_app_ref(ref->loc_id) < 0)
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDEC, FAIL, "decrementing location ID failed")
        }
        else {
            if (H5I_dec_ref(ref->loc_id) < 0)
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDEC, FAIL, "decrementing location ID failed")
        }
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__destroy() */

/*-------------------------------------------------------------------------
 * Function:    H5R__set_loc_id
 *
 * Purpose:     Attach location ID to reference and increment location refcount.
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5R__set_loc_id(H5R_ref_priv_t *ref, hid_t id, hbool_t inc_ref, hbool_t app_ref)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(ref != NULL);
    HDassert(id != H5I_INVALID_HID);

    /* If a location ID was previously assigned, decrement refcount and
     * assign new one */
    if ((ref->loc_id != H5I_INVALID_HID)) {
        if (ref->app_ref) {
            if (H5I_dec_app_ref(ref->loc_id) < 0)
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDEC, FAIL, "decrementing location ID failed")
        }
        else {
            if (H5I_dec_ref(ref->loc_id) < 0)
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDEC, FAIL, "decrementing location ID failed")
        }
    }
    ref->loc_id = id;

    /* Prevent location ID from being freed until reference is destroyed,
     * set app_ref if necessary as references are exposed to users and are
     * expected to be destroyed, this allows the loc_id to be cleanly released
     * on shutdown if users fail to call H5Rdestroy(). */
    if (inc_ref && H5I_inc_ref(ref->loc_id, app_ref) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINC, FAIL, "incrementing location ID failed")
    ref->app_ref = app_ref;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__set_loc_id() */

/*-------------------------------------------------------------------------
 * Function:    H5R__get_loc_id
 *
 * Purpose:     Retrieve location ID attached to existing reference.
 *
 * Return:      Valid ID on success / H5I_INVALID_HID on failure
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5R__get_loc_id(const H5R_ref_priv_t *ref)
{
    hid_t ret_value = H5I_INVALID_HID; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(ref != NULL);

    ret_value = ref->loc_id;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__get_loc_id() */

/*-------------------------------------------------------------------------
 * Function:    H5R__reopen_file
 *
 * Purpose:     Re-open referenced file using file access property list.
 *
 * Return:      Valid ID on success / H5I_INVALID_HID on failure
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5R__reopen_file(H5R_ref_priv_t *ref, hid_t fapl_id)
{
    H5P_genplist_t       *plist;           /* Property list for FAPL */
    void                 *new_file = NULL; /* File object opened */
    H5VL_connector_prop_t connector_prop;  /* Property for VOL connector ID & info     */
    H5VL_object_t        *vol_obj = NULL;  /* VOL object for file */
    uint64_t              supported;       /* Whether 'post open' operation is supported by VOL connector */
    hid_t                 ret_value = H5I_INVALID_HID;

    FUNC_ENTER_PACKAGE

    /* TODO add search path */

    /* Verify access property list and set up collective metadata if appropriate */
    if (H5CX_set_apl(&fapl_id, H5P_CLS_FACC, H5I_INVALID_HID, TRUE) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, H5I_INVALID_HID, "can't set access property list info")

    /* Get the VOL info from the fapl */
    if (NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5I_INVALID_HID, "not a file access property list")
    if (H5P_peek(plist, H5F_ACS_VOL_CONN_NAME, &connector_prop) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL connector info")

    /* Stash a copy of the "top-level" connector property, before any pass-through
     *  connectors modify or unwrap it.
     */
    if (H5CX_set_vol_connector_prop(&connector_prop) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, H5I_INVALID_HID,
                    "can't set VOL connector info in API context")

    /* Open the file */
    /* (Must open file read-write to allow for object modifications) */
    if (NULL == (new_file = H5VL_file_open(&connector_prop, H5R_REF_FILENAME(ref), H5F_ACC_RDWR, fapl_id,
                                           H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL)))
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTOPENFILE, H5I_INVALID_HID, "unable to open file")

    /* Get an ID for the file */
    if ((ret_value = H5VL_register_using_vol_id(H5I_FILE, new_file, connector_prop.connector_id, TRUE)) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTREGISTER, H5I_INVALID_HID, "unable to register file handle")

    /* Get the file object */
    if (NULL == (vol_obj = H5VL_vol_object(ret_value)))
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, H5I_INVALID_HID, "invalid object identifier")

    /* Make the 'post open' callback */
    supported = 0;
    if (H5VL_introspect_opt_query(vol_obj, H5VL_SUBCLS_FILE, H5VL_NATIVE_FILE_POST_OPEN, &supported) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, H5I_INVALID_HID, "can't check for 'post open' operation")
    if (supported & H5VL_OPT_QUERY_SUPPORTED) {
        H5VL_optional_args_t vol_cb_args; /* Arguments to VOL callback */

        /* Set up VOL callback arguments */
        vol_cb_args.op_type = H5VL_NATIVE_FILE_POST_OPEN;
        vol_cb_args.args    = NULL;

        /* Make the 'post open' callback */
        if (H5VL_file_optional(vol_obj, &vol_cb_args, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL) < 0)
            HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, H5I_INVALID_HID,
                        "unable to make file 'post open' callback")
    } /* end if */

    /* Attach loc_id to reference */
    if (H5R__set_loc_id((H5R_ref_priv_t *)ref, ret_value, FALSE, TRUE) < 0)
        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, H5I_INVALID_HID, "unable to attach location id to reference")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__reopen_file() */

/*-------------------------------------------------------------------------
 * Function:    H5R__get_type
 *
 * Purpose:     Given a reference to some object, return the type of that
 *              reference.
 *
 * Return:      Type of the reference
 *
 *-------------------------------------------------------------------------
 */
H5R_type_t
H5R__get_type(const H5R_ref_priv_t *ref)
{
    H5R_type_t ret_value = H5R_BADTYPE;

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(ref != NULL);
    ret_value = (H5R_type_t)ref->type;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__get_type() */

/*-------------------------------------------------------------------------
 * Function:    H5R__equal
 *
 * Purpose:     Compare two references
 *
 * Return:      TRUE if equal, FALSE if unequal, FAIL if error
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5R__equal(const H5R_ref_priv_t *ref1, const H5R_ref_priv_t *ref2)
{
    htri_t ret_value = TRUE;

    FUNC_ENTER_PACKAGE

    HDassert(ref1 != NULL);
    HDassert(ref2 != NULL);

    /* Compare reference types */
    if (ref1->type != ref2->type)
        HGOTO_DONE(FALSE);

    /* Compare object addresses */
    if (ref1->token_size != ref2->token_size)
        HGOTO_DONE(FALSE);
    if (0 != HDmemcmp(&ref1->info.obj.token, &ref2->info.obj.token, ref1->token_size))
        HGOTO_DONE(FALSE);

    /* Compare filenames */
    if ((ref1->info.obj.filename && (NULL == ref2->info.obj.filename)) ||
        ((NULL == ref1->info.obj.filename) && ref2->info.obj.filename))
        HGOTO_DONE(FALSE);
    if (ref1->info.obj.filename && ref1->info.obj.filename &&
        (0 != HDstrcmp(ref1->info.obj.filename, ref2->info.obj.filename)))
        HGOTO_DONE(FALSE);

    switch (ref1->type) {
        case H5R_OBJECT2:
            break;
        case H5R_DATASET_REGION2:
            if ((ret_value = H5S_extent_equal(ref1->info.reg.space, ref2->info.reg.space)) < 0)
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCOMPARE, FAIL, "cannot compare dataspace extents")
            break;
        case H5R_ATTR:
            HDassert(ref1->info.attr.name && ref2->info.attr.name);
            if (0 != HDstrcmp(ref1->info.attr.name, ref2->info.attr.name))
                HGOTO_DONE(FALSE);
            break;
        case H5R_OBJECT1:
        case H5R_DATASET_REGION1:
        case H5R_BADTYPE:
        case H5R_MAXTYPE:
            HDassert("invalid reference type" && 0);
            HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (invalid reference type)")
        default:
            HDassert("unknown reference type" && 0);
            HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5R__equal() */

/*-------------------------------------------------------------------------
 * Function:    H5R__copy
 *
 * Purpose:     Copy a reference
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5R__copy(const H5R_ref_priv_t *src_ref, H5R_ref_priv_t *dst_ref)
{
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_PACKAGE

    HDassert((src_ref != NULL) && (dst_ref != NULL));

    H5MM_memcpy(&dst_ref->info.obj.token, &src_ref->info.obj.token, sizeof(H5O_token_t));
    dst_ref->encode_size = src_ref->encode_size;
    dst_ref->type        = src_ref->type;
    dst_ref->token_size  = src_ref->token_size;

    switch (src_ref->type) {
        case H5R_OBJECT2:
            break;
        case H5R_DATASET_REGION2:
            if (NULL == (dst_ref->info.reg.space = H5S_copy(src_ref->info.reg.space, FALSE, TRUE)))
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCOPY, FAIL, "unable to copy dataspace")
            break;
        case H5R_ATTR:
            if (NULL == (dst_ref->info.attr.name = HDstrdup(src_ref->info.attr.name)))
                HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCOPY, FAIL, "Cannot copy attribute name")
            break;


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