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authorDana Robinson <derobins@hdfgroup.org>2017-11-08 01:56:27 (GMT)
committerDana Robinson <derobins@hdfgroup.org>2017-11-08 01:56:27 (GMT)
commitd0e32b545c41dcc36a69ab146b54b55e7ac9dc07 (patch)
tree37b24e8b9ec321eb2585c0628ee9d8d0433962ff /src/H5Rint.c
parent86650b977c357441dec0b71530c5971503efaaff (diff)
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Split internal H5R functionality into H5Rint.c.
Diffstat (limited to 'src/H5Rint.c')
-rw-r--r--src/H5Rint.c767
1 files changed, 767 insertions, 0 deletions
diff --git a/src/H5Rint.c b/src/H5Rint.c
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--- /dev/null
+++ b/src/H5Rint.c
@@ -0,0 +1,767 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/****************/
+/* 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 "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 */
+
+
+/****************/
+/* Local Macros */
+/****************/
+
+/******************/
+/* Local Typedefs */
+/******************/
+
+/********************/
+/* Local Prototypes */
+/********************/
+
+/*********************/
+/* Package Variables */
+/*********************/
+
+/* Package initialization variable */
+hbool_t H5_PKG_INIT_VAR = FALSE;
+
+/*****************************/
+/* Library Private Variables */
+/*****************************/
+
+/*******************/
+/* Local Variables */
+/*******************/
+
+/* Reference ID class
+ *
+ * NOTE: H5I_REFERENCE is not used by the library and has been deprecated
+ * with a tentative removal version of 1.12.0. (DER, July 2017)
+ */
+static const H5I_class_t H5I_REFERENCE_CLS[1] = {{
+ H5I_REFERENCE, /* ID class value */
+ 0, /* Class flags */
+ 0, /* # of reserved IDs for class */
+ NULL /* Callback routine for closing objects of this class */
+}};
+
+/* Flag indicating "top" of interface has been initialized */
+static hbool_t H5R_top_package_initialize_s = FALSE;
+
+
+/*--------------------------------------------------------------------------
+NAME
+ H5R__init_package -- Initialize interface-specific information
+USAGE
+ herr_t H5R__init_package()
+
+RETURNS
+ Non-negative on success/Negative on failure
+DESCRIPTION
+ Initializes any interface-specific data or routines.
+
+--------------------------------------------------------------------------*/
+herr_t
+H5R__init_package(void)
+{
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_NOAPI_NOINIT
+
+ /* Initialize the atom group for the file IDs */
+ if (H5I_register_type(H5I_REFERENCE_CLS) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable to initialize interface")
+
+ /* Mark "top" of interface as initialized, too */
+ H5R_top_package_initialize_s = TRUE;
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5R__init_package() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_top_term_package
+ PURPOSE
+ Terminate various H5R objects
+ USAGE
+ void H5R_top_term_package()
+ RETURNS
+ void
+ DESCRIPTION
+ Release IDs for the atom group, deferring full interface shutdown
+ until later (in H5R_term_package).
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ Can't report errors...
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+int
+H5R_top_term_package(void)
+{
+ int n = 0;
+
+ FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+ if (H5R_top_package_initialize_s) {
+ if (H5I_nmembers(H5I_REFERENCE) > 0) {
+ (void)H5I_clear_type(H5I_REFERENCE, FALSE, FALSE);
+ n++;
+ }
+
+ /* Mark closed */
+ if (0 == n)
+ H5R_top_package_initialize_s = FALSE;
+ }
+
+ FUNC_LEAVE_NOAPI(n)
+} /* end H5R_top_term_package() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_term_package
+ PURPOSE
+ Terminate various H5R objects
+ USAGE
+ void H5R_term_package()
+ RETURNS
+ void
+ DESCRIPTION
+ Release the atom group and any other resources allocated.
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ Can't report errors...
+
+ Finishes shutting down the interface, after H5R_top_term_package()
+ is called
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+int
+H5R_term_package(void)
+{
+ int n = 0;
+
+ FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+ if (H5_PKG_INIT_VAR) {
+ /* Sanity checks */
+ HDassert(0 == H5I_nmembers(H5I_REFERENCE));
+ HDassert(FALSE == H5R_top_package_initialize_s);
+
+ /* Destroy the reference id group */
+ n += (H5I_dec_type_ref(H5I_REFERENCE) > 0);
+
+ /* Mark closed */
+ if (0 == n)
+ H5_PKG_INIT_VAR = FALSE;
+ }
+
+ FUNC_LEAVE_NOAPI(n)
+} /* end H5R_term_package() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_create
+ PURPOSE
+ Creates a particular kind of reference for the user
+ USAGE
+ herr_t H5R_create(ref, loc, name, ref_type, space)
+ void *ref; OUT: Reference created
+ H5G_loc_t *loc; IN: File location used to locate object pointed to
+ const char *name; IN: Name of object at location LOC_ID of object
+ pointed to
+ H5R_type_t ref_type; IN: Type of reference to create
+ H5S_t *space; IN: Dataspace ID with selection, used for Dataset
+ Region references.
+
+ RETURNS
+ Non-negative on success/Negative on failure
+ DESCRIPTION
+ Creates a particular type of reference specified with REF_TYPE, in the
+ space pointed to by REF. The LOC_ID and NAME are used to locate the object
+ pointed to and the SPACE_ID is used to choose the region pointed to (for
+ Dataset Region references).
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+herr_t
+H5R_create(void *_ref, H5G_loc_t *loc, const char *name, H5R_type_t ref_type, H5S_t *space, hid_t dxpl_id)
+{
+ H5G_loc_t obj_loc; /* Group hier. location of object */
+ H5G_name_t path; /* Object group hier. path */
+ H5O_loc_t oloc; /* Object object location */
+ hbool_t obj_found = FALSE; /* Object location found */
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_NOAPI_NOINIT
+
+ HDassert(_ref);
+ HDassert(loc);
+ HDassert(name);
+ HDassert(ref_type > H5R_BADTYPE && ref_type < H5R_MAXTYPE);
+
+ /* Set up object location to fill in */
+ obj_loc.oloc = &oloc;
+ obj_loc.path = &path;
+ H5G_loc_reset(&obj_loc);
+
+ /* Find the object */
+ if (H5G_loc_find(loc, name, &obj_loc, H5P_DEFAULT, dxpl_id) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_NOTFOUND, FAIL, "object not found")
+ obj_found = TRUE;
+
+ switch (ref_type) {
+ case H5R_OBJECT:
+ {
+ hobj_ref_t *ref = (hobj_ref_t *)_ref; /* Get pointer to correct type of reference struct */
+
+ *ref = obj_loc.oloc->addr;
+ break;
+ }
+
+ case H5R_DATASET_REGION:
+ {
+ H5HG_t hobjid; /* Heap object ID */
+ hdset_reg_ref_t *ref = (hdset_reg_ref_t *)_ref; /* Get pointer to correct type of reference struct */
+ hssize_t buf_size; /* Size of buffer needed to serialize selection */
+ uint8_t *p; /* Pointer to OID to store */
+ uint8_t *buf; /* Buffer to store serialized selection in */
+ unsigned heapid_found; /* Flag for non-zero heap ID found */
+ unsigned u; /* local index */
+
+ /* Set up information for dataset region */
+
+ /* Return any previous heap block to the free list if we are
+ * garbage collecting
+ */
+ if (H5F_GC_REF(loc->oloc->file)) {
+ /* Check for an existing heap ID in the reference */
+ for (u = 0, heapid_found = 0, p = (uint8_t *)ref; u < H5R_DSET_REG_REF_BUF_SIZE; u++)
+ if (p[u] != 0) {
+ heapid_found = 1;
+ break;
+ }
+
+ if (heapid_found != 0) {
+ /* Return heap block to free list */
+ }
+ }
+
+ /* Zero the heap ID out, may leak heap space if user is re-using
+ * reference and doesn't have garbage collection turned on
+ */
+ HDmemset(ref, 0, H5R_DSET_REG_REF_BUF_SIZE);
+
+ /* Get the amount of space required to serialize the selection */
+ if ((buf_size = H5S_SELECT_SERIAL_SIZE(space)) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "Invalid amount of space for serializing selection")
+
+ /* Increase buffer size to allow for the dataset OID */
+ buf_size += (hssize_t)sizeof(haddr_t);
+
+ /* Allocate the space to store the serialized information */
+ H5_CHECK_OVERFLOW(buf_size, hssize_t, size_t);
+ if (NULL == (buf = (uint8_t *)H5MM_malloc((size_t)buf_size)))
+ HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
+
+ /* Serialize information for dataset OID into heap buffer */
+ p = (uint8_t *)buf;
+ H5F_addr_encode(loc->oloc->file, &p, obj_loc.oloc->addr);
+
+ /* Serialize the selection into heap buffer */
+ if (H5S_SELECT_SERIALIZE(space, &p) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCOPY, FAIL, "Unable to serialize selection")
+
+ /* Save the serialized buffer for later */
+ H5_CHECK_OVERFLOW(buf_size, hssize_t, size_t);
+ if (H5HG_insert(loc->oloc->file, dxpl_id, (size_t)buf_size, buf, &hobjid) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_WRITEERROR, FAIL, "Unable to serialize selection")
+
+ /* Serialize the heap ID and index for storage in the file */
+ p = (uint8_t *)ref;
+ H5F_addr_encode(loc->oloc->file, &p, hobjid.addr);
+ UINT32ENCODE(p, hobjid.idx);
+
+ /* Free the buffer we serialized data in */
+ H5MM_xfree(buf);
+ break;
+ } /* end case H5R_DATASET_REGION */
+
+ case H5R_BADTYPE:
+ case H5R_MAXTYPE:
+ default:
+ HDassert("unknown reference type" && 0);
+ HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)")
+ } /* end switch */
+
+done:
+ if (obj_found)
+ H5G_loc_free(&obj_loc);
+
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5R_create() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_dereference
+ PURPOSE
+ Opens the HDF5 object referenced.
+ USAGE
+ hid_t H5R_dereference(ref)
+ H5F_t *file; IN: File the object being dereferenced is within
+ H5R_type_t ref_type; IN: Type of reference
+ void *ref; IN: Reference to open.
+
+ RETURNS
+ Valid ID on success, Negative on failure
+ DESCRIPTION
+ Given a reference to some object, open that object and return an ID for
+ that object.
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ Currently only set up to work with references to datasets
+ EXAMPLES
+ REVISION LOG
+ Raymond Lu
+ 13 July 2011
+ I added the OAPL_ID parameter for the object being referenced. It only
+ supports dataset access property list currently.
+
+ M. Scot Breitenfeld
+ 3 March 2015
+ Added a check for undefined reference pointer.
+--------------------------------------------------------------------------*/
+hid_t
+H5R_dereference(H5F_t *file, hid_t oapl_id, hid_t dxpl_id, H5R_type_t ref_type, const void *_ref, hbool_t app_ref)
+{
+ H5O_loc_t oloc; /* Object location */
+ H5G_name_t path; /* Path of object */
+ H5G_loc_t loc; /* Group location */
+ unsigned rc; /* Reference count of object */
+ H5O_type_t obj_type; /* Type of object */
+ hid_t ret_value = H5I_INVALID_HID; /* Return value */
+
+ FUNC_ENTER_NOAPI_NOINIT
+
+ HDassert(_ref);
+ HDassert(ref_type > H5R_BADTYPE && ref_type < H5R_MAXTYPE);
+ HDassert(file);
+
+ /* Initialize the object location */
+ H5O_loc_reset(&oloc);
+ oloc.file = file;
+
+ switch (ref_type) {
+ case H5R_OBJECT:
+ {
+ oloc.addr = *(const hobj_ref_t *)_ref; /* Only object references currently supported */
+ if (!H5F_addr_defined(oloc.addr) || oloc.addr == 0)
+ HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "Undefined reference pointer")
+ break;
+ }
+
+ case H5R_DATASET_REGION:
+ {
+ H5HG_t hobjid; /* Heap object ID */
+ uint8_t *buf; /* Buffer to store serialized selection in */
+ const uint8_t *p; /* Pointer to OID to store */
+
+ /* Get the heap ID for the dataset region */
+ p = (const uint8_t *)_ref;
+ H5F_addr_decode(oloc.file, &p, &(hobjid.addr));
+ UINT32DECODE(p, hobjid.idx);
+
+ if (!H5F_addr_defined(hobjid.addr) || hobjid.addr == 0)
+ HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "Undefined reference pointer")
+
+ /* Get the dataset region from the heap (allocate inside routine) */
+ if (NULL == (buf = (uint8_t *)H5HG_read(oloc.file, dxpl_id, &hobjid, NULL, NULL)))
+ HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, FAIL, "Unable to read dataset region information")
+
+ /* Get the object oid for the dataset */
+ p = buf;
+ H5F_addr_decode(oloc.file, &p, &(oloc.addr));
+
+ /* Free the buffer allocated in H5HG_read() */
+ H5MM_xfree(buf);
+ break;
+ } /* end case H5R_DATASET_REGION */
+
+ case H5R_BADTYPE:
+ case H5R_MAXTYPE:
+ default:
+ HDassert("unknown reference type" && 0);
+ HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)")
+ } /* end switch */
+
+ /* Get the # of links for object, and its type
+ * (To check to make certain that this object hasn't been deleted
+ * since the reference was created)
+ */
+ if (H5O_get_rc_and_type(&oloc, dxpl_id, &rc, &obj_type) < 0 || 0 == rc)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_LINKCOUNT, FAIL, "dereferencing deleted object")
+
+ /* Construct a group location for opening the object */
+ H5G_name_reset(&path);
+ loc.oloc = &oloc;
+ loc.path = &path;
+
+ /* Open the object */
+ switch (obj_type) {
+ case H5O_TYPE_GROUP:
+ {
+ H5G_t *group; /* Pointer to group to open */
+
+ if (NULL == (group = H5G_open(&loc, dxpl_id)))
+ HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "not found")
+
+ /* Create an atom for the group */
+ if ((ret_value = H5I_register(H5I_GROUP, group, app_ref)) < 0) {
+ H5G_close(group);
+ HGOTO_ERROR(H5E_SYM, H5E_CANTREGISTER, FAIL, "can't register group")
+ }
+
+ break;
+ }
+
+ case H5O_TYPE_NAMED_DATATYPE:
+ {
+ H5T_t *type; /* Pointer to datatype to open */
+
+ if (NULL == (type = H5T_open(&loc, dxpl_id)))
+ HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, FAIL, "not found")
+
+ /* Create an atom for the datatype */
+ if ((ret_value = H5I_register(H5I_DATATYPE, type, app_ref)) < 0) {
+ H5T_close(type);
+ HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "can't register datatype")
+ }
+
+ break;
+ }
+
+ case H5O_TYPE_DATASET:
+ {
+ H5D_t *dset; /* Pointer to dataset to open */
+
+ /* Open the dataset */
+ if (NULL == (dset = H5D_open(&loc, oapl_id, dxpl_id)))
+ HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, FAIL, "not found")
+
+ /* Create an atom for the dataset */
+ if ((ret_value = H5I_register(H5I_DATASET, dset, app_ref)) < 0) {
+ H5D_close(dset);
+ HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "can't register dataset")
+ }
+
+ break;
+ }
+
+ case H5O_TYPE_UNKNOWN:
+ case H5O_TYPE_NTYPES:
+ default:
+ HGOTO_ERROR(H5E_REFERENCE, H5E_BADTYPE, FAIL, "can't identify type of object referenced")
+ } /* end switch */
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5R_dereference() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_get_region
+ PURPOSE
+ Retrieves a dataspace with the region pointed to selected.
+ USAGE
+ H5S_t *H5R_get_region(file, ref_type, ref)
+ H5F_t *file; IN: File the object being dereferenced is within
+ void *ref; IN: Reference to open.
+
+ RETURNS
+ Pointer to the dataspace on success, NULL on failure
+ DESCRIPTION
+ Given a reference to some object, creates a copy of the dataset pointed
+ to's dataspace and defines a selection in the copy which is the region
+ pointed to.
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+H5S_t *
+H5R_get_region(H5F_t *file, hid_t dxpl_id, const void *_ref)
+{
+ H5O_loc_t oloc; /* Object location */
+ const uint8_t *p; /* Pointer to OID to store */
+ H5HG_t hobjid; /* Heap object ID */
+ uint8_t *buf = NULL; /* Buffer to store serialized selection in */
+ H5S_t *ret_value;
+
+ FUNC_ENTER_NOAPI_NOINIT
+
+ HDassert(_ref);
+ HDassert(file);
+
+ /* Initialize the object location */
+ H5O_loc_reset(&oloc);
+ oloc.file = file;
+
+ /* Get the heap ID for the dataset region */
+ p = (const uint8_t *)_ref;
+ H5F_addr_decode(oloc.file, &p, &(hobjid.addr));
+ UINT32DECODE(p, hobjid.idx);
+
+ /* Get the dataset region from the heap (allocate inside routine) */
+ if ((buf = (uint8_t *)H5HG_read(oloc.file, dxpl_id, &hobjid, NULL, NULL)) == NULL)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, NULL, "Unable to read dataset region information")
+
+ /* Get the object oid for the dataset */
+ p = buf;
+ H5F_addr_decode(oloc.file, &p, &(oloc.addr));
+
+ /* Open and copy the dataset's dataspace */
+ if ((ret_value = H5S_read(&oloc, dxpl_id)) == NULL)
+ HGOTO_ERROR(H5E_DATASPACE, H5E_NOTFOUND, NULL, "not found")
+
+ /* Unserialize the selection */
+ if (H5S_SELECT_DESERIALIZE(&ret_value, &p) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDECODE, NULL, "can't deserialize selection")
+
+done:
+ /* Free the buffer allocated in H5HG_read() */
+ if (buf)
+ H5MM_xfree(buf);
+
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5R_get_region() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_get_obj_type
+ PURPOSE
+ Retrieves the type of object that an object reference points to
+ USAGE
+ H5O_type_t H5R_get_obj_type(file, ref_type, ref)
+ H5F_t *file; IN: File the object being dereferenced is within
+ H5R_type_t ref_type; IN: Type of reference to query
+ void *ref; IN: Reference to query.
+
+ RETURNS
+ Success: An object type defined in H5Gpublic.h
+ Failure: H5G_UNKNOWN
+ DESCRIPTION
+ Given a reference to some object, this function returns the type of object
+ pointed to.
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+herr_t
+H5R_get_obj_type(H5F_t *file, hid_t dxpl_id, H5R_type_t ref_type,
+ const void *_ref, H5O_type_t *obj_type)
+{
+ H5O_loc_t oloc; /* Object location */
+ unsigned rc; /* Reference count of object */
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_NOAPI_NOINIT
+
+ HDassert(file);
+ HDassert(_ref);
+
+ /* Initialize the symbol table entry */
+ H5O_loc_reset(&oloc);
+ oloc.file = file;
+
+ switch (ref_type) {
+ case H5R_OBJECT:
+ {
+ /* Get the object oid */
+ oloc.addr = *(const hobj_ref_t *)_ref; /* Only object references currently supported */
+ break;
+ }
+
+ case H5R_DATASET_REGION:
+ {
+ H5HG_t hobjid; /* Heap object ID */
+ const uint8_t *p; /* Pointer to reference to decode */
+ uint8_t *buf; /* Buffer to store serialized selection in */
+
+ /* Get the heap ID for the dataset region */
+ p = (const uint8_t *)_ref;
+ H5F_addr_decode(oloc.file, &p, &(hobjid.addr));
+ UINT32DECODE(p, hobjid.idx);
+
+ /* Get the dataset region from the heap (allocate inside routine) */
+ if ((buf = (uint8_t *)H5HG_read(oloc.file, dxpl_id, &hobjid, NULL, NULL)) == NULL)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, FAIL, "Unable to read dataset region information")
+
+ /* Get the object oid for the dataset */
+ p = buf;
+ H5F_addr_decode(oloc.file, &p, &(oloc.addr));
+
+ /* Free the buffer allocated in H5HG_read() */
+ H5MM_xfree(buf);
+
+ break;
+ }
+
+ case H5R_BADTYPE:
+ case H5R_MAXTYPE:
+ default:
+ HDassert("unknown reference type" && 0);
+ HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)")
+ } /* end switch */
+
+ /* Get the # of links for object, and its type */
+ /* (To check to make certain that this object hasn't been deleted since the reference was created) */
+ if (H5O_get_rc_and_type(&oloc, dxpl_id, &rc, obj_type) < 0 || 0 == rc)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_LINKCOUNT, FAIL, "dereferencing deleted object")
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5R_get_obj_type() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
+ H5R_get_name
+ PURPOSE
+ Internal routine to determine a name for the object referenced
+ USAGE
+ ssize_t H5R_get_name(f, dxpl_id, ref_type, ref, name, size)
+ H5F_t *f; IN: Pointer to the file that the reference is pointing
+ into
+ hid_t lapl_id; IN: LAPL to use for operation
+ hid_t dxpl_id; IN: DXPL to use for operation
+ hid_t id; IN: Location ID given for reference
+ H5R_type_t ref_type; IN: Type of reference
+ void *ref; IN: Reference to query.
+ char *name; OUT: Buffer to place name of object referenced
+ size_t size; IN: Size of name buffer
+
+ RETURNS
+ Non-negative length of the path on success, Negative on failure
+ DESCRIPTION
+ Given a reference to some object, determine a path to the object
+ referenced in the file.
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+ This may not be the only path to that object.
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+ssize_t
+H5R_get_name(H5F_t *f, hid_t lapl_id, hid_t dxpl_id, hid_t id, H5R_type_t ref_type,
+ const void *_ref, char *name, size_t size)
+{
+ hid_t file_id = H5I_INVALID_HID; /* ID for file that the reference is in */
+ H5O_loc_t oloc; /* Object location describing object for reference */
+ ssize_t ret_value = -1; /* Return value */
+
+ FUNC_ENTER_NOAPI_NOINIT
+
+ /* Check args */
+ HDassert(f);
+ HDassert(_ref);
+
+ /* Initialize the object location */
+ H5O_loc_reset(&oloc);
+ oloc.file = f;
+
+ /* Get address for reference */
+ switch (ref_type) {
+ case H5R_OBJECT:
+ {
+ oloc.addr = *(const hobj_ref_t *)_ref;
+ break;
+ }
+
+ case H5R_DATASET_REGION:
+ {
+ H5HG_t hobjid; /* Heap object ID */
+ uint8_t *buf; /* Buffer to store serialized selection in */
+ const uint8_t *p; /* Pointer to OID to store */
+
+ /* Get the heap ID for the dataset region */
+ p = (const uint8_t *)_ref;
+ H5F_addr_decode(oloc.file, &p, &(hobjid.addr));
+ UINT32DECODE(p, hobjid.idx);
+
+ /* Get the dataset region from the heap (allocate inside routine) */
+ if ((buf = (uint8_t *)H5HG_read(oloc.file, dxpl_id, &hobjid, NULL, NULL)) == NULL)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, FAIL, "Unable to read dataset region information")
+
+ /* Get the object oid for the dataset */
+ p = buf;
+ H5F_addr_decode(oloc.file, &p, &(oloc.addr));
+
+ /* Free the buffer allocated in H5HG_read() */
+ H5MM_xfree(buf);
+
+ break;
+ }
+
+ case H5R_BADTYPE:
+ case H5R_MAXTYPE:
+ default:
+ HDassert("unknown reference type" && 0);
+ HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)")
+ } /* end switch */
+
+ /* Retrieve file ID for name search */
+ if ((file_id = H5I_get_file_id(id, FALSE)) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "can't retrieve file ID")
+
+ /* Get name, length, etc. */
+ if ((ret_value = H5G_get_name_by_addr(file_id, lapl_id, dxpl_id, &oloc, name, size)) < 0)
+ HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "can't determine name")
+
+done:
+ /* Close file ID used for search */
+ if (file_id > 0 && H5I_dec_ref(file_id) < 0)
+ HDONE_ERROR(H5E_REFERENCE, H5E_CANTDEC, FAIL, "can't decrement ref count of temp ID")
+
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5R_get_name() */
+