path: root/src/H5Ocopy.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 files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:		H5Ocopy.c
 *			Nov  6 2006
 *			Quincey Koziol <koziol@hdfgroup.org>
 *
 * Purpose:		Object copying routines.
 *
 *-------------------------------------------------------------------------
 */

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

#define H5O_PACKAGE		/*suppress error about including H5Opkg	  */

/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free lists                           */
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5HGprivate.h"        /* Global Heaps                         */
#include "H5Lprivate.h"         /* Links			  	*/
#include "H5MFprivate.h"	/* File memory management		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Opkg.h"             /* Object headers			*/
#include "H5Pprivate.h"         /* Property lists                       */

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


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


/********************/
/* Package Typedefs */
/********************/


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

static herr_t H5O_copy_free_addrmap_cb(void *item, void *key, void *op_data);
static herr_t H5O_copy_header_real(const H5O_loc_t *oloc_src, H5O_loc_t *oloc_dst /*out */,
    hid_t dxpl_id, H5O_copy_t *cpy_info);
static herr_t H5O_copy_header(const H5O_loc_t *oloc_src, H5O_loc_t *oloc_dst /*out */,
    hid_t dxpl_id, unsigned cpy_option);
static herr_t H5O_copy_obj(H5G_loc_t *src_loc, H5G_loc_t *dst_loc,
    const char *dst_name, hid_t ocpypl_id, hid_t lcpl_id);
static herr_t H5O_copy_obj_by_ref(H5O_loc_t *src_oloc, hid_t dxpl_id,
    H5O_loc_t *dst_oloc, H5G_loc_t *dst_root_loc, H5O_copy_t *cpy_info);

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

/* Declare a free list to manage the H5O_addr_map_t struct */
H5FL_DEFINE(H5O_addr_map_t);


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


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



/*-------------------------------------------------------------------------
 * Function:    H5Ocopy
 *
 * Purpose:     Copy an object (group or dataset) to destination location
 *              within a file or cross files. PLIST_ID is a property list
 *              which is used to pass user options and properties to the
 *              copy. The name, dst_name, must not already be taken by some
 *              other object in the destination group.
 *
 *              H5Ocopy() will fail if the name of the destination object
 *                  exists in the destination group.  For example,
 *                  H5Ocopy(fid_src, "/dset", fid_dst, "/dset", ...)
 *                  will fail if "/dset" exists in the destination file
 *
 *              OPTIONS THAT HAVE BEEN IMPLEMENTED.
 *                  H5O_COPY_SHALLOW_HIERARCHY_FLAG
 *                      If this flag is specified, only immediate members of
 *                      the group are copied. Otherwise (default), it will
 *                      recursively copy all objects below the group
 *                  H5O_COPY_EXPAND_SOFT_LINK_FLAG
 *                      If this flag is specified, it will copy the objects
 *                      pointed by the soft links. Otherwise (default), it
 *                      will copy the soft link as they are
 *                  H5O_COPY_WITHOUT_ATTR_FLAG
 *                      If this flag is specified, it will copy object without
 *                      copying attributes. Otherwise (default), it will
 *                      copy object along with all its attributes
 *                  H5O_COPY_EXPAND_REFERENCE_FLAG
 *                      1) Copy object between two different files:
 *                          When this flag is specified, it will copy objects that
 *                          are pointed by the references and update the values of
 *                          references in the destination file.  Otherwise (default)
 *                          the values of references in the destination will set to
 *                          zero
 *                          The current implementation does not handle references
 *                          inside of other datatype structure. For example, if
 *                          a member of compound datatype is reference, H5Ocopy()
 *                          will copy that field as it is. It will not set the
 *                          value to zero as default is used nor copy the object
 *                          pointed by that field the flag is set
 *                      2) Copy object within the same file:
 *                          This flag does not have any effect to the H5Ocopy().
 *                          Datasets or attributes of references are copied as they
 *                          are, i.e. values of references of the destination object
 *                          are the same as the values of the source object
 *
 *              OPTIONS THAT MAY APPLY TO COPY IN THE FUTURE.
 *                  H5O_COPY_EXPAND_EXT_LINK_FLAG
 *                      If this flag is specified, it will expand the external links
 *                      into new objects, Otherwise (default), it will keep external
 *                      links as they are (default)
 *
 *              PROPERTIES THAT MAY APPLY TO COPY IN FUTURE
 *                  Change data layout such as chunk size
 *                  Add filter such as data compression.
 *                  Add an attribute to the copied object(s) that say the  date/time
 *                      for the copy or other information about the source file.
 *
 *              The intermediate group creation property should be passed in
 *              using the lcpl instead of the ocpypl.
 *
 * Usage:      H5Ocopy(src_loc_id, src_name, dst_loc_id, dst_name, ocpypl_id, lcpl_id)
 *             hid_t src_loc_id         IN: Source file or group identifier.
 *             const char *src_name     IN: Name of the source object to be copied
 *             hid_t dst_loc_id         IN: Destination file or group identifier
 *             const char *dst_name     IN: Name of the destination object
 *             hid_t ocpypl_id          IN: Properties which apply to the copy
 *             hid_t lcpl_id            IN: Properties which apply to the new hard link
 *
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *              June 4, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Ocopy(hid_t src_loc_id, const char *src_name, hid_t dst_loc_id,
        const char *dst_name, hid_t ocpypl_id, hid_t lcpl_id)
{
    H5G_loc_t	loc;                    /* Source group group location */
    H5G_loc_t	src_loc;                /* Source object group location */
    H5G_loc_t	dst_loc;                /* Destination group location */

    /* for opening the destination object */
    H5G_name_t  src_path;               /* Opened source object hier. path */
    H5O_loc_t   src_oloc;               /* Opened source object object location */
    hbool_t     loc_found = FALSE;      /* Location at 'name' found */
    hbool_t     obj_open = FALSE;       /* Entry at 'name' found */

    herr_t      ret_value = SUCCEED;        /* Return value */

    FUNC_ENTER_API(H5Ocopy, FAIL)
    H5TRACE6("e", "i*si*sii", src_loc_id, src_name, dst_loc_id, dst_name,
             ocpypl_id, lcpl_id);

    /* Check arguments */
    if(H5G_loc(src_loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(H5G_loc(dst_loc_id, &dst_loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!src_name || !*src_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no source name specified")
    if(!dst_name || !*dst_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no destination name specified")

    /* check if destination name already exists */
    {
        H5G_name_t  tmp_path;
        H5O_loc_t   tmp_oloc;
        H5G_loc_t   tmp_loc;

        /* Set up group location */
        tmp_loc.oloc = &tmp_oloc;
        tmp_loc.path = &tmp_path;
        H5G_loc_reset(&tmp_loc);

        /* Check if object already exists in destination */
        if(H5G_loc_find(&dst_loc, dst_name, &tmp_loc, H5P_DEFAULT, H5AC_dxpl_id) >= 0) {
            H5G_name_free(&tmp_path);
            HGOTO_ERROR(H5E_SYM, H5E_EXISTS, FAIL, "destination object already exists")
        } /* end if */
    }

    /* Set up opened group location to fill in */
    src_loc.oloc = &src_oloc;
    src_loc.path = &src_path;
    H5G_loc_reset(&src_loc);

    /* Find the source object to copy */
    if(H5G_loc_find(&loc, src_name, &src_loc/*out*/, H5P_DEFAULT, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "source object not found")
    loc_found = TRUE;

    /* Open source object's object header */
    if(H5O_open(&src_oloc) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, FAIL, "unable to open object")
    obj_open = TRUE;

    /* Get correct property lists */
    if(H5P_DEFAULT == lcpl_id) {
        if((lcpl_id = H5L_get_default_lcpl()) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "unable to get default lcpl")
    } /* end if */
    else
        if(TRUE != H5P_isa_class(lcpl_id, H5P_LINK_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link creation property list")

    /* Get object copy property list */
    if(H5P_DEFAULT == ocpypl_id)
        ocpypl_id = H5P_OBJECT_COPY_DEFAULT;
    else
        if(TRUE != H5P_isa_class(ocpypl_id, H5P_OBJECT_COPY))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not object copy property list")

    /* Do the actual copying of the object */
    if(H5O_copy_obj(&src_loc, &dst_loc, dst_name, ocpypl_id, lcpl_id) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")

done:
    if(loc_found && H5G_loc_free(&src_loc) < 0)
        HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't free location")
    if(obj_open)
        H5O_close(&src_oloc);

    FUNC_LEAVE_API(ret_value)
} /* end H5Ocopy() */


/*-------------------------------------------------------------------------
 * Function:    H5O_copy_header_real
 *
 * Purpose:     Copy header object from one location to another using
 *              pre-copy, copy, and post-copy callbacks for each message
 *              type.
 *
 *              The source header object is compressed into a single chunk
 *              (since we know how big it is) and any continuation messages
 *              are converted into NULL messages.
 *
 *              By default, NULL messages are not copied.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *              May 30, 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_copy_header_real(const H5O_loc_t *oloc_src, H5O_loc_t *oloc_dst /*out */,
    hid_t dxpl_id, H5O_copy_t *cpy_info)
{
    H5O_addr_map_t         *addr_map = NULL;       /* Address mapping of object copied */
    H5O_t                  *oh_src = NULL;         /* Object header for source object */
    H5O_t                  *oh_dst = NULL;         /* Object header for destination object */
    unsigned               mesgno = 0;
    haddr_t                addr_new = HADDR_UNDEF;
    hbool_t                *deleted = NULL;      /* Array of flags indicating whether messages should be copied */
    size_t                 null_msgs;               /* Number of NULL messages found in each loop */
    size_t                 orig_dst_msgs;           /* Original # of messages in dest. object */
    H5O_mesg_t             *mesg_src;               /* Message in source object header */
    H5O_mesg_t             *mesg_dst;               /* Message in source object header */
    const H5O_msg_class_t  *copy_type;              /* Type of message to use for copying */
    const H5O_obj_class_t  *obj_class = NULL;       /* Type of object we are copying */
    void                   *udata = NULL;           /* User data for passing to message callbacks */
    uint64_t               dst_oh_size;             /* Total size of the destination OH */
    size_t                 dst_oh_null;             /* Size of the null message to add to destination OH */
    unsigned               dst_oh_gap;              /* Size of the gap in chunk #0 of destination OH */
    uint8_t                *current_pos;            /* Current position in destination image */
    size_t                 msghdr_size;
    herr_t                 ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5O_copy_header_real)

    HDassert(oloc_src);
    HDassert(oloc_src->file);
    HDassert(H5F_addr_defined(oloc_src->addr));
    HDassert(oloc_dst->file);
    HDassert(cpy_info);

    /* Get source object header */
    if(NULL == (oh_src = (H5O_t *)H5AC_protect(oloc_src->file, dxpl_id, H5AC_OHDR, oloc_src->addr, NULL, NULL, H5AC_READ)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to load object header")

    /* Get pointer to object class for this object */
    if(NULL == (obj_class = H5O_obj_class_real(oh_src)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to determine object type")

    /* Retrieve user data for particular type of object to copy */
    if(obj_class->get_copy_file_udata &&
            (NULL == (udata = (obj_class->get_copy_file_udata)())))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to retrieve copy user data")

    /* Flush any dirty messages in source object header to update the header chunks */
    if(H5O_flush_msgs(oloc_src->file, oh_src) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to flush object header messages")

    /* Allocate the destination object header and fill in header fields */
    if(NULL == (oh_dst = H5FL_CALLOC(H5O_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    /* Initialize header information */
    oh_dst->version = oh_src->version;
    oh_dst->flags = oh_src->flags;
    oh_dst->link_msgs_seen = oh_src->link_msgs_seen;
    oh_dst->attr_msgs_seen = oh_src->attr_msgs_seen;
    oh_dst->sizeof_size = H5F_SIZEOF_SIZE(oloc_dst->file);
    oh_dst->sizeof_addr = H5F_SIZEOF_ADDR(oloc_dst->file);

    /* Copy time fields */
    oh_dst->atime = oh_src->atime;
    oh_dst->mtime = oh_src->mtime;
    oh_dst->ctime = oh_src->ctime;
    oh_dst->btime = oh_src->btime;

    /* Copy attribute storage information */
    oh_dst->max_compact = oh_src->max_compact;
    oh_dst->min_dense = oh_src->min_dense;

    /* Initialize size of chunk array.  The destination always has only one
     * chunk.
     */
    oh_dst->alloc_nchunks = oh_dst->nchunks = 1;

    /* Allocate memory for the chunk array */
    if(NULL == (oh_dst->chunk = H5FL_SEQ_MALLOC(H5O_chunk_t, oh_dst->alloc_nchunks)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    /* Allocate memory for "deleted" array.  This array marks the message in
     * the source that shouldn't be copied to the destination.
     */
     if(NULL == (deleted = (hbool_t *)HDmalloc(sizeof(hbool_t) * oh_src->nmesgs)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
     HDmemset(deleted, FALSE, sizeof(hbool_t) * oh_src->nmesgs);

    /* "pre copy" pass over messages, to gather information for actual message copy operation
     * (for messages which depend on information from other messages)
     * Keep track of how many NULL or deleted messages we find (or create)
     */
    null_msgs = 0;
    for(mesgno = 0; mesgno < oh_src->nmesgs; mesgno++) {
        /* Set up convenience variables */
        mesg_src = &(oh_src->mesg[mesgno]);

        /* Sanity check */
        HDassert(!mesg_src->dirty);     /* Should be cleared by earlier call to flush messages */

        /* Get message class to operate on */
        copy_type = mesg_src->type;

        /* Check for continuation message; these are converted to NULL
         * messages because the destination OH will have only one chunk
         */
        if(H5O_CONT_ID == mesg_src->type->id || H5O_NULL_ID == mesg_src->type->id) {
            deleted[mesgno] = TRUE;
            ++null_msgs;
            copy_type = H5O_MSG_NULL;
        } /* end if */
        HDassert(copy_type);

        if(copy_type->pre_copy_file) {
            /* Decode the message if necessary. */
            H5O_LOAD_NATIVE(oloc_src->file, dxpl_id, 0, oh_src, mesg_src, FAIL)

            /* Perform "pre copy" operation on message */
            if((copy_type->pre_copy_file)(oloc_src->file, mesg_src->native, &(deleted[mesgno]), cpy_info, udata) < 0)
                HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to perform 'pre copy' operation on message")

            /* Check if the message should be deleted in the destination */
            if(deleted[mesgno])
                /* Mark message as deleted */
                ++null_msgs;
        } /* end if(copy_type->pre_copy_file) */
    } /* end for */

    /* Initialize size of message list.  It may or may not include the NULL messages
     * detected above.
     */
    if(cpy_info->preserve_null)
        oh_dst->alloc_nmesgs = oh_dst->nmesgs = oh_src->nmesgs;
    else
        oh_dst->alloc_nmesgs = oh_dst->nmesgs = (oh_src->nmesgs - null_msgs);

    /* Allocate memory for destination message array */
    if(oh_dst->alloc_nmesgs > 0)
        if(NULL == (oh_dst->mesg = H5FL_SEQ_CALLOC(H5O_mesg_t, oh_dst->alloc_nmesgs)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    /* "copy" pass over messages, to perform main message copying */
    null_msgs = 0;
    for(mesgno = 0; mesgno < oh_dst->nmesgs; mesgno++) {
        /* Skip any deleted or NULL messages in the source unless the
         * preserve_null flag is set
         */
        if(FALSE == cpy_info->preserve_null) {
            while(deleted[mesgno + null_msgs]) {
                ++null_msgs;
                HDassert(mesgno + null_msgs < oh_src->nmesgs);
            } /* end while */
        } /* end if */

        /* Set up convenience variables */
        mesg_src = &(oh_src->mesg[mesgno + null_msgs]);
        mesg_dst = &(oh_dst->mesg[mesgno]);

        /* Initialize non-zero components of destination message */
        mesg_dst->crt_idx = mesg_src->crt_idx;
        mesg_dst->flags = mesg_src->flags;
        mesg_dst->raw_size = mesg_src->raw_size;
        mesg_dst->type = mesg_src->type;

        /* If we're preserving deleted messages, set their types to 'NULL'
         * in the destination.
         */
        if(cpy_info->preserve_null && deleted[mesgno]) {
            mesg_dst->type = H5O_MSG_NULL;
            mesg_dst->flags = 0;
            mesg_dst->dirty = 1;
        } /* end if */

        /* Check for message class to operate on */
        /* (Use destination message, in case the message has been removed (i.e
         *      converted to a nil message) in the destination -QAK)
         */
        copy_type = mesg_dst->type;
        HDassert(copy_type);

        /* copy this message into destination file */
        if(copy_type->copy_file) {
            htri_t is_shared;           /* Whether message is shared */
            hbool_t recompute_size;     /* Whether copy_file callback created a shared message */

            /* Decode the message if necessary. */
            H5O_LOAD_NATIVE(oloc_src->file, dxpl_id, 0, oh_src, mesg_src, FAIL)

            /* Copy the source message */
            recompute_size = FALSE;
            if((mesg_dst->native = H5O_msg_copy_file(copy_type,
                    oloc_src->file, mesg_src->native, oloc_dst->file,
                    &recompute_size, cpy_info, udata, dxpl_id)) == NULL)
                HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object header message")

            /* Check if new message is shared */
            if((is_shared = H5O_msg_is_shared(copy_type->id, mesg_dst->native)) < 0)
                HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "unable to query message's shared status")

            /* In being copied, the message may have become shared or stopped
             * being shared, set/unset its sharing flag.
             */
            if(is_shared && !(mesg_dst->flags & H5O_MSG_FLAG_SHARED)) {
                mesg_dst->flags |= H5O_MSG_FLAG_SHARED;

                /* Recompute message size (mesg_dst->native is really shared) */
                 recompute_size = TRUE;
            } /* end if */
            else if(!is_shared && (mesg_dst->flags & H5O_MSG_FLAG_SHARED)) {
                mesg_dst->flags &= ~H5O_MSG_FLAG_SHARED;

                /* Recompute message size (msg_dest->native is no longer shared) */
                recompute_size = TRUE;
            } /* end if */

            /* Recompute message's size */
            /* (its sharing status or one of its components (for attributes)
             *  could have changed)
             */
            if(recompute_size)
                mesg_dst->raw_size = H5O_ALIGN_OH(oh_dst,
                        H5O_msg_raw_size(oloc_dst->file, mesg_dst->type->id, FALSE, mesg_dst->native));

            /* Mark the message in the destination as dirty, so it'll get encoded when the object header is flushed */
            mesg_dst->dirty = TRUE;
        } /* end if (mesg_src->type->copy_file) */
    } /* end of mesgno loop */


    /* Allocate the destination header and copy any messages that didn't have
     * copy callbacks.  They get copied directly from the source image to the
     * destination image.
     */

    /* Calculate how big the destination object header will be on disk.
     * This isn't necessarily the same size as the original.
     */

    /* Compute space for messages. */
    dst_oh_size = 0;
    for(mesgno = 0; mesgno < oh_dst->nmesgs; mesgno++) {
        dst_oh_size += H5O_SIZEOF_MSGHDR_OH(oh_dst);
        dst_oh_size += oh_dst->mesg[mesgno].raw_size;
    } /* end for */

    /* Check if we need to determine correct value for chunk #0 size bits */
    if(oh_dst->version > H5O_VERSION_1) {
        /* Reset destination object header's "chunk 0 size" flags */
        oh_dst->flags &= ~H5O_HDR_CHUNK0_SIZE;

        /* Determine correct value for chunk #0 size bits */
        if(dst_oh_size > 4294967295)
            oh_dst->flags |= H5O_HDR_CHUNK0_8;
        else if(dst_oh_size > 65535)
            oh_dst->flags |= H5O_HDR_CHUNK0_4;
        else if(dst_oh_size > 255)
            oh_dst->flags |= H5O_HDR_CHUNK0_2;
    } /* end if */

    /* Check if the chunk's data portion is too small */
    dst_oh_gap = dst_oh_null = 0;
    if(dst_oh_size < H5O_MIN_SIZE) {
        size_t delta = (H5O_MIN_SIZE - dst_oh_size);    /* Delta in chunk size needed */

        /* Sanity check */
        HDassert((oh_dst->flags & H5O_HDR_CHUNK0_SIZE) == H5O_HDR_CHUNK0_1);

        /* Determine whether to create gap or NULL message */
        if(delta < H5O_SIZEOF_MSGHDR_OH(oh_dst))
            dst_oh_gap = delta;
        else
            dst_oh_null = delta;

        /* Increase destination object header size */
        dst_oh_size += delta;

        /* Sanity check */
        HDassert(dst_oh_size <= 255);
    } /* end if */

    /* Add in destination's object header size now */
    dst_oh_size += H5O_SIZEOF_HDR(oh_dst);

    /* Allocate space for chunk in destination file */
    if(HADDR_UNDEF == (oh_dst->chunk[0].addr = H5MF_alloc(oloc_dst->file, H5FD_MEM_OHDR, dxpl_id, (hsize_t)dst_oh_size)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for object header")
    addr_new = oh_dst->chunk[0].addr;

    /* Create memory image for the new chunk */
    if(NULL == (oh_dst->chunk[0].image = H5FL_BLK_MALLOC(chunk_image, (size_t)dst_oh_size)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    /* Set dest. chunk information */
    oh_dst->chunk[0].dirty = TRUE;
    oh_dst->chunk[0].size = (size_t)dst_oh_size;
    oh_dst->chunk[0].gap = dst_oh_gap;

    /* Set up raw pointers and copy messages that didn't need special
     * treatment.  This has to happen after the destination header has been
     * allocated.
     */
    HDassert(H5O_SIZEOF_MSGHDR_OH(oh_src) == H5O_SIZEOF_MSGHDR_OH(oh_dst));
    msghdr_size = H5O_SIZEOF_MSGHDR_OH(oh_dst);

    current_pos = oh_dst->chunk[0].image;

    /* Write the magic number for versions > 1 and skip the rest of the
     * header.  This will be written when the header is flushed to disk.
     */
    if(oh_dst->version > H5O_VERSION_1)
        HDmemcpy(current_pos, H5O_HDR_MAGIC, (size_t)H5_SIZEOF_MAGIC);
    current_pos += H5O_SIZEOF_HDR(oh_dst) - H5O_SIZEOF_CHKSUM_OH(oh_dst);

    /* Loop through destination messages, updating their "raw" info */
    null_msgs = 0;
    for(mesgno = 0; mesgno < oh_dst->nmesgs; mesgno++) {
        /* Skip any deleted or NULL messages in the source unless the
         * preserve_null flag is set.
         */
        if(FALSE == cpy_info->preserve_null) {
            while(deleted[mesgno + null_msgs]) {
                ++null_msgs;
                HDassert(mesgno + null_msgs < oh_src->nmesgs);
            } /* end while */
        } /* end if */

        /* Set up convenience variables */
        mesg_src = &(oh_src->mesg[mesgno + null_msgs]);
        mesg_dst = &(oh_dst->mesg[mesgno]);

        /* Copy each message that wasn't dirtied above */
        if(!mesg_dst->dirty)
            /* Copy the message header plus the message's raw data. */
            HDmemcpy(current_pos, mesg_src->raw - msghdr_size, msghdr_size + mesg_src->raw_size);

        /* Set message's raw pointer to destination chunk's new "image" */
        mesg_dst->raw = current_pos + msghdr_size;

        /* Move to location where next message should go */
        current_pos += mesg_dst->raw_size + msghdr_size;
    } /* end for */

    /* Save this in case more messages are added during NULL message checking */
    orig_dst_msgs = oh_dst->nmesgs;

    /* Check if we need to add a NULL message to this header */
    if(dst_oh_null > 0) {
        unsigned null_idx;              /* Index of new NULL message */

        /* Make sure we have enough space for new NULL message */
        if(oh_dst->nmesgs + 1 > oh_dst->alloc_nmesgs)
            if(H5O_alloc_msgs(oh_dst, (size_t)1) < 0)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate more space for messages")

        /* Create null message for [rest of] space in new chunk */
        /* (account for chunk's magic # & checksum) */
        null_idx = oh_dst->nmesgs++;
        oh_dst->mesg[null_idx].type = H5O_MSG_NULL;
        oh_dst->mesg[null_idx].dirty = TRUE;
        oh_dst->mesg[null_idx].native = NULL;
        oh_dst->mesg[null_idx].raw = current_pos + msghdr_size;
        oh_dst->mesg[null_idx].raw_size = dst_oh_null -  msghdr_size;
        oh_dst->mesg[null_idx].chunkno = 0;
    } /* end if */

    /* Make sure we filled the chunk, except for room at the end for a checksum */
    HDassert(current_pos + dst_oh_gap + dst_oh_null + H5O_SIZEOF_CHKSUM_OH(oh_dst) == (size_t)dst_oh_size + oh_dst->chunk[0].image);

    /* Set the dest. object location to the first chunk address */
    HDassert(H5F_addr_defined(addr_new));
    oloc_dst->addr = addr_new;


    /* Allocate space for the address mapping of the object copied */
    if(NULL == (addr_map = H5FL_MALLOC(H5O_addr_map_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    /* Insert the address mapping for the new object into the copied list */
    /* (Do this here, because "post copy" possibly checks it) */
    addr_map->src_addr = oloc_src->addr;
    addr_map->dst_addr = oloc_dst->addr;
    addr_map->is_locked = TRUE;                 /* We've locked the object currently */
    addr_map->inc_ref_count = 0;                /* Start with no additional ref counts to add */

    if(H5SL_insert(cpy_info->map_list, addr_map, &(addr_map->src_addr)) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTINSERT, FAIL, "can't insert object into skip list")

    /* "post copy" loop over messages, to fix up any messages which require a complete
     * object header for destination object
     */
    null_msgs = 0;
    for(mesgno = 0; mesgno < orig_dst_msgs; mesgno++) {
        /* Skip any deleted or NULL messages in the source unless the
         * preserve_null flag is set
         */
        if(FALSE == cpy_info->preserve_null) {
            while(deleted[mesgno + null_msgs]) {
                ++null_msgs;
                HDassert(mesgno + null_msgs < oh_src->nmesgs);
            } /* end while */
        } /* end if */

        /* Set up convenience variables */
        mesg_src = &(oh_src->mesg[mesgno + null_msgs]);
        mesg_dst = &(oh_dst->mesg[mesgno]);

        /* Check for message class to operate on */
        /* (Use destination message, in case the message has been removed (i.e
         *      converted to a nil message) in the destination -QAK)
         */
        copy_type = mesg_dst->type;
        HDassert(copy_type);

        if(copy_type->post_copy_file && mesg_src->native) {
            /* Sanity check destination message */
            HDassert(mesg_dst->type == mesg_src->type);
            HDassert(mesg_dst->native);

            /* the object header is needed in the post copy for shared message */
            cpy_info->oh_dst = oh_dst;

            /* Perform "post copy" operation on message */
            if((copy_type->post_copy_file)(oloc_src, mesg_src->native, oloc_dst,
                    mesg_dst->native, dxpl_id, cpy_info) < 0)
                HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to perform 'post copy' operation on message")
        } /* end if */
    } /* end for */

    /* Indicate that the destination address will no longer be locked */
    addr_map->is_locked = FALSE;

    /* Increment object header's reference count, if any descendents have created links to this object */
    if(addr_map->inc_ref_count) {
        H5_CHECK_OVERFLOW(addr_map->inc_ref_count, hsize_t, unsigned);
        oh_dst->nlink += (unsigned)addr_map->inc_ref_count;
    } /* end if */

    /* Insert destination object header in cache */
    if(H5AC_set(oloc_dst->file, dxpl_id, H5AC_OHDR, oloc_dst->addr, oh_dst, H5AC__NO_FLAGS_SET, NULL) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to cache object header")

done:
    /* Free deleted array */
    if(deleted)
        HDfree(deleted);

    /* Release pointer to source object header and its derived objects */
    if(oh_src != NULL) {
        /* Unprotect the source object header */
        if(H5AC_unprotect(oloc_src->file, dxpl_id, H5AC_OHDR, oloc_src->addr, oh_src, H5AC__NO_FLAGS_SET) < 0)
            HDONE_ERROR(H5E_OHDR, H5E_PROTECT, FAIL, "unable to release object header")
    } /* end if */

    /* Release pointer to destination object header */
    if(ret_value < 0 && oh_dst) {
        if(H5O_dest(oloc_dst->file, oh_dst) < 0)
	    HDONE_ERROR(H5E_OHDR, H5E_CANTFREE, FAIL, "unable to destroy object header data")
    } /* end if */

    /* Release user data for particular type of object to copy */
    if(udata) {
        HDassert(obj_class);
        HDassert(obj_class->free_copy_file_udata);
        (obj_class->free_copy_file_udata)(udata);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_copy_header_real() */


/*-------------------------------------------------------------------------
 * Function:    H5O_copy_header_map
 *
 * Purpose:     Copy header object from one location to another, detecting
 *              already mapped objects, etc.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              November 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5O_copy_header_map(const H5O_loc_t *oloc_src, H5O_loc_t *oloc_dst /*out */,
    hid_t dxpl_id, H5O_copy_t *cpy_info, hbool_t inc_depth)
{
    H5O_addr_map_t      *addr_map;              /* Address mapping of object copied */
    hbool_t             inc_link;               /* Whether to increment the link count for the object */
    herr_t             ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5O_copy_header_map, FAIL)

    /* Sanity check */
    HDassert(oloc_src);
    HDassert(oloc_dst);
    HDassert(oloc_dst->file);
    HDassert(cpy_info);

    /* Look up the address of the object to copy in the skip list */
    addr_map = (H5O_addr_map_t *)H5SL_search(cpy_info->map_list, &(oloc_src->addr));

    /* Check if address is already in list of objects copied */
    if(addr_map == NULL) {
        /* Copy object for the first time */

        /* Check for incrementing the depth of copy */
        /* (Can't do this for all copies, since committed datatypes should always be copied) */
        if(inc_depth)
            cpy_info->curr_depth++;

        /* Copy object referred to */
        if(H5O_copy_header_real(oloc_src, oloc_dst, dxpl_id, cpy_info) < 0)
            HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")

        /* Check for incrementing the depth of copy */
        if(inc_depth)
            cpy_info->curr_depth--;

        /* When an object is copied for the first time, increment it's link */
        inc_link = TRUE;

        /* indicate that a new object is created */
        ret_value++;
    } /* end if */
    else {
        /* Object has already been copied, set its address in destination file */
        oloc_dst->addr = addr_map->dst_addr;

        /* If the object is locked currently (because we are copying a group
         * hierarchy and this is a link to a group higher in the hierarchy),
         * increment it's deferred reference count instead of incrementing the
         * reference count now.
         */
        if(addr_map->is_locked) {
            addr_map->inc_ref_count++;
            inc_link = FALSE;
        } /* end if */
        else
            inc_link = TRUE;
    } /* end else */

    /* Increment destination object's link count, if allowed */
    if(inc_link)
        if(H5O_link(oloc_dst, 1, dxpl_id) < 0)
            HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to increment object link count")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_copy_header_map() */


/*--------------------------------------------------------------------------
 NAME
    H5O_copy_free_addrmap_cb
 PURPOSE
    Internal routine to free address maps from the skip list for copying objects
 USAGE
    herr_t H5O_copy_free_addrmap_cb(item, key, op_data)
        void *item;             IN/OUT: Pointer to addr
        void *key;              IN/OUT: (unused)
        void *op_data;          IN: (unused)
 RETURNS
    Returns zero on success, negative on failure.
 DESCRIPTION
        Releases the memory for the address.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5O_copy_free_addrmap_cb(void *item, void UNUSED *key, void UNUSED *op_data)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_copy_free_addrmap_cb)

    HDassert(item);

    /* Release the item */
    (void)H5FL_FREE(H5O_addr_map_t, item);

    FUNC_LEAVE_NOAPI(0)
}   /* H5O_copy_free_addrmap_cb() */


/*-------------------------------------------------------------------------
 * Function:    H5O_copy_header
 *
 * Purpose:     copy header object from one location to another.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *              May 30, 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_copy_header(const H5O_loc_t *oloc_src, H5O_loc_t *oloc_dst /*out */,
    hid_t dxpl_id, unsigned cpy_option)
{
    H5O_copy_t  cpy_info;               /* Information for copying object */
    herr_t      ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5O_copy_header)

    HDassert(oloc_src);
    HDassert(oloc_src->file);
    HDassert(H5F_addr_defined(oloc_src->addr));
    HDassert(oloc_dst->file);

    /* Convert copy flags into copy struct */
    HDmemset(&cpy_info, 0, sizeof(H5O_copy_t));
    if((cpy_option & H5O_COPY_SHALLOW_HIERARCHY_FLAG) > 0) {
        cpy_info.copy_shallow = TRUE;
        cpy_info.max_depth = 1;
    } /* end if */
    else
        cpy_info.max_depth = -1;        /* Current default is for full, recursive hier. copy */
    cpy_info.curr_depth = 0;
    if((cpy_option & H5O_COPY_EXPAND_SOFT_LINK_FLAG) > 0)
        cpy_info.expand_soft_link = TRUE;
    if((cpy_option & H5O_COPY_EXPAND_EXT_LINK_FLAG) > 0)
        cpy_info.expand_ext_link = TRUE;
    if((cpy_option & H5O_COPY_EXPAND_REFERENCE_FLAG) > 0)
        cpy_info.expand_ref = TRUE;
    if((cpy_option & H5O_COPY_WITHOUT_ATTR_FLAG) > 0)
        cpy_info.copy_without_attr = TRUE;
    if((cpy_option & H5O_COPY_PRESERVE_NULL_FLAG) > 0)
        cpy_info.preserve_null = TRUE;

    /* Create a skip list to keep track of which objects are copied */
    if((cpy_info.map_list = H5SL_create(H5SL_TYPE_HADDR, 0.5, (size_t)16)) == NULL)
        HGOTO_ERROR(H5E_SLIST, H5E_CANTCREATE, FAIL, "cannot make skip list")

    /* copy the object from the source file to the destination file */
    if(H5O_copy_header_real(oloc_src, oloc_dst, dxpl_id, &cpy_info) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")

done:
    if(cpy_info.map_list)
        H5SL_destroy(cpy_info.map_list, H5O_copy_free_addrmap_cb, NULL);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_copy_header() */


/*-------------------------------------------------------------------------
 * Function:    H5O_copy_obj
 *
 * Purpose:     Copy an object to destination location
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *              June 4, 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_copy_obj(H5G_loc_t *src_loc, H5G_loc_t *dst_loc, const char *dst_name,
    hid_t ocpypl_id, hid_t lcpl_id)
{
    H5P_genplist_t  *ocpy_plist=NULL;           /* Object copy property list created */
    hid_t           dxpl_id=H5AC_dxpl_id;
    H5G_name_t      new_path;                   /* Copied object group hier. path */
    H5O_loc_t       new_oloc;                   /* Copied object object location */
    H5G_loc_t       new_loc;                    /* Group location of object copied */
    hbool_t         entry_inserted=FALSE;       /* Flag to indicate that the new entry was inserted into a group */
    unsigned        cpy_option = 0;             /* Copy options */
    herr_t          ret_value = SUCCEED;        /* Return value */

    FUNC_ENTER_NOAPI(H5O_copy_obj, FAIL)

    HDassert(src_loc);
    HDassert(src_loc->oloc->file);
    HDassert(dst_loc);
    HDassert(dst_loc->oloc->file);
    HDassert(dst_name);

    /* Get the copy property list */
    if(NULL == (ocpy_plist = (H5P_genplist_t *)H5I_object(ocpypl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")

    /* Retrieve the copy parameters */
    if(H5P_get(ocpy_plist, H5O_CPY_OPTION_NAME, &cpy_option) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get object copy flag")

    /* Set up copied object location to fill in */
    new_loc.oloc = &new_oloc;
    new_loc.path = &new_path;
    H5G_loc_reset(&new_loc);
    new_oloc.file = dst_loc->oloc->file;

    /* Copy the object from the source file to the destination file */
    if(H5O_copy_header(src_loc->oloc, &new_oloc, dxpl_id, cpy_option) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")

    /* Insert the new object in the destination file's group */
    if(H5L_link(dst_loc, dst_name, &new_loc, lcpl_id, H5P_DEFAULT, dxpl_id) < 0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to insert link")
    entry_inserted = TRUE;

done:
    /* Free the ID to name buffers */
    if(entry_inserted)
        H5G_loc_free(&new_loc);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_copy_obj() */


/*-------------------------------------------------------------------------
 * Function:    H5O_copy_obj_by_ref
 *
 * Purpose:     Copy the object pointed by _src_ref.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *              Aug 7 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_copy_obj_by_ref(H5O_loc_t *src_oloc, hid_t dxpl_id, H5O_loc_t *dst_oloc,
    H5G_loc_t *dst_root_loc, H5O_copy_t *cpy_info)
{
    herr_t  ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5O_copy_obj_by_ref, FAIL)

    HDassert(src_oloc);
    HDassert(dst_oloc);

    /* Perform the copy, or look up existing copy */
    if((ret_value = H5O_copy_header_map(src_oloc, dst_oloc, dxpl_id, cpy_info, FALSE)) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")

    /* Check if a new valid object is copied to the destination */
    if(H5F_addr_defined(dst_oloc->addr) && (ret_value > SUCCEED)) {
        char    tmp_obj_name[80];
        H5G_name_t      new_path;
        H5O_loc_t       new_oloc;
        H5G_loc_t       new_loc;

        /* Set up group location for new object */
        new_loc.oloc = &new_oloc;
        new_loc.path = &new_path;
        H5G_loc_reset(&new_loc);
        new_oloc.file = dst_oloc->file;
        new_oloc.addr = dst_oloc->addr;

        /* Pick a default name for the new object */
        sprintf(tmp_obj_name, "~obj_pointed_by_%llu", (unsigned long long)dst_oloc->addr);

        /* Create a link to the newly copied object */
        if(H5L_link(dst_root_loc, tmp_obj_name, &new_loc, H5P_DEFAULT, H5P_DEFAULT, dxpl_id) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to insert link")

        H5G_loc_free(&new_loc);
    } /* if (H5F_addr_defined(dst_oloc.addr)) */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_copy_obj_by_ref() */


/*-------------------------------------------------------------------------
 * Function:	H5O_copy_expand_ref
 *
 * Purpose:	Copy the object pointed by _src_ref.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *		Aug 7 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5O_copy_expand_ref(H5F_t *file_src, void *_src_ref, hid_t dxpl_id,
    H5F_t *file_dst, void *_dst_ref, size_t ref_count, H5R_type_t ref_type,
    H5O_copy_t *cpy_info)
{
    H5O_loc_t 	dst_oloc;         	/* Copied object object location */
    H5O_loc_t	src_oloc;          	/* Temporary object location for source object */
    H5G_loc_t   dst_root_loc;           /* The location of root group of the destination file */
    uint8_t     *p;                     /* Pointer to OID to store */
    size_t      i;                      /* Local index variable */
    herr_t	ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5O_copy_expand_ref, FAIL)

    /* Sanity checks */
    HDassert(file_src);
    HDassert(_src_ref);
    HDassert(file_dst);
    HDassert(_dst_ref);
    HDassert(ref_count);
    HDassert(cpy_info);

    /* Initialize object locations */
    H5O_loc_reset(&src_oloc);
    H5O_loc_reset(&dst_oloc);
    src_oloc.file = file_src;
    dst_oloc.file = file_dst;

    /* Set up the root group in the destination file */
    if(NULL == (dst_root_loc.oloc = H5G_oloc(H5G_rootof(file_dst))))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unable to get object location for root group")
    if(NULL == (dst_root_loc.path = H5G_nameof(H5G_rootof(file_dst))))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unable to get path for root group")

    /* Copy object references */
    if(H5R_OBJECT == ref_type) {
        hobj_ref_t *src_ref = (hobj_ref_t *)_src_ref;
        hobj_ref_t *dst_ref = (hobj_ref_t *)_dst_ref;

        /* Making equivalent references in the destination file */
        for(i = 0; i < ref_count; i++) {
            /* Set up for the object copy for the reference */
            p = (uint8_t *)(&src_ref[i]);
            H5F_addr_decode(src_oloc.file, (const uint8_t **)&p, &(src_oloc.addr));
            dst_oloc.addr = HADDR_UNDEF;

            /* Attempt to copy object from source to destination file */
            if(H5O_copy_obj_by_ref(&src_oloc, dxpl_id, &dst_oloc, &dst_root_loc, cpy_info) < 0)
                HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")

            /* Set the object reference info for the destination file */
            p = (uint8_t *)(&dst_ref[i]);
            H5F_addr_encode(dst_oloc.file, &p, dst_oloc.addr);
	} /* end for */
    }  /* end if */
    /* Copy region references */
    else if(H5R_DATASET_REGION == ref_type) {
        hdset_reg_ref_t *src_ref = (hdset_reg_ref_t *)_src_ref;
        hdset_reg_ref_t *dst_ref = (hdset_reg_ref_t *)_dst_ref;
        uint8_t *buf;           /* Buffer to store serialized selection in */
        H5HG_t hobjid;          /* Heap object ID */
        size_t buf_size;        /* Length of object in heap */

        /* Making equivalent references in the destination file */
        for(i = 0; i < ref_count; i++) {
            /* Get the heap ID for the dataset region */
            p = (uint8_t *)(&src_ref[i]);
            H5F_addr_decode(src_oloc.file, (const uint8_t **)&p, &(hobjid.addr));
            INT32DECODE(p, hobjid.idx);

            /* Get the dataset region from the heap (allocate inside routine) */
            if((buf = (uint8_t *)H5HG_read(src_oloc.file, dxpl_id, &hobjid, NULL, &buf_size)) == NULL)
                HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, FAIL, "Unable to read dataset region information")

            /* Get the object oid for the dataset */
            p = (uint8_t *)buf;
            H5F_addr_decode(src_oloc.file, (const uint8_t **)&p, &(src_oloc.addr));
            dst_oloc.addr = HADDR_UNDEF;

            /* copy the object pointed by the ref to the destination */
            if(H5O_copy_obj_by_ref(&src_oloc, dxpl_id, &dst_oloc, &dst_root_loc, cpy_info) < 0) {
                H5MM_xfree(buf);
                HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "unable to copy object")
            } /* end if */

            /* Serialize object ID */
            p = (uint8_t *)buf;
            H5F_addr_encode(dst_oloc.file, &p, dst_oloc.addr);

            /* Save the serialized buffer to the destination */
            if(H5HG_insert(dst_oloc.file, dxpl_id, buf_size, buf, &hobjid) < 0) {
                H5MM_xfree(buf);
                HGOTO_ERROR(H5E_OHDR, H5E_CANTCOPY, FAIL, "Unable to write dataset region information")
            } /* end if */

            /* Set the dataset region reference info for the destination file */
            p = (uint8_t *)(&dst_ref[i]);
            H5F_addr_encode(dst_oloc.file, &p, hobjid.addr);
            INT32ENCODE(p, hobjid.idx);

            /* Free the buffer allocated in H5HG_read() */
            H5MM_xfree(buf);
        } /* end for */
    } /* end if */
    else
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference type")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_copy_expand_ref() */