/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /****************/ /* Module Setup */ /****************/ #define H5R_PACKAGE /*suppress error about including H5Rpkg */ /* Interface initialization */ #define H5_INTERFACE_INIT_FUNC H5R_init_interface /***********/ /* 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 "H5Rpkg.h" /* References */ #include "H5Sprivate.h" /* Dataspaces */ /****************/ /* Local Macros */ /****************/ /******************/ /* Local Typedefs */ /******************/ /********************/ /* Local Prototypes */ /********************/ static 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); static hid_t H5R_dereference(H5F_t *file, hid_t dxpl_id, H5R_type_t ref_type, const void *_ref, hbool_t app_ref); static H5S_t * H5R_get_region(H5F_t *file, hid_t dxpl_id, const void *_ref); static ssize_t H5R_get_name(H5F_t *file, hid_t lapl_id, hid_t dxpl_id, hid_t id, H5R_type_t ref_type, const void *_ref, char *name, size_t size); /*********************/ /* Package Variables */ /*********************/ /*****************************/ /* Library Private Variables */ /*****************************/ /*******************/ /* Local Variables */ /*******************/ /* Reference ID class */ static const H5I_class_t H5I_REFERENCE_CLS[1] = {{ H5I_REFERENCE, /* ID class value */ H5I_CLASS_REUSE_IDS, /* Class flags */ 0, /* # of reserved IDs for class */ NULL /* Callback routine for closing objects of this class */ }}; /*------------------------------------------------------------------------- * Function: H5R_init * * Purpose: Initialize the interface from some other package. * * Return: Success: non-negative * Failure: negative * * Programmer: Quincey Koziol * Thursday, September 13, 2007 * *------------------------------------------------------------------------- */ herr_t H5R_init(void) { herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI(FAIL) /* FUNC_ENTER() does all the work */ done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5R_init() */ /*-------------------------------------------------------------------------- NAME H5R_init_interface -- Initialize interface-specific information USAGE herr_t H5R_init_interface() RETURNS Non-negative on success/Negative on failure DESCRIPTION Initializes any interface-specific data or routines. --------------------------------------------------------------------------*/ static herr_t H5R_init_interface(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"); done: FUNC_LEAVE_NOAPI(ret_value) } /*-------------------------------------------------------------------------- NAME H5R_term_interface PURPOSE Terminate various H5R objects USAGE void H5R_term_interface() RETURNS void DESCRIPTION Release the atom group and any other resources allocated. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS Can't report errors... EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ int H5R_term_interface(void) { int n=0; FUNC_ENTER_NOAPI_NOINIT_NOERR if (H5_interface_initialize_g) { if ((n=H5I_nmembers(H5I_REFERENCE))) { H5I_clear_type(H5I_REFERENCE, FALSE, FALSE); } else { /* Close deprecated interface */ n += H5R__term_deprec_interface(); H5I_dec_type_ref(H5I_REFERENCE); H5_interface_initialize_g = 0; n = 1; /*H5I*/ } } FUNC_LEAVE_NOAPI(n) } /*-------------------------------------------------------------------------- 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 --------------------------------------------------------------------------*/ static 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; } /* end if */ if(heapid_found != 0) { /* Return heap block to free list */ } /* end if */ } /* end if */ /* Zero the heap ID out, may leak heap space if user is re-using reference and doesn't have garbage collection 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; } 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 H5Rcreate PURPOSE Creates a particular kind of reference for the user USAGE herr_t H5Rcreate(ref, loc_id, name, ref_type, space_id) void *ref; OUT: Reference created hid_t loc_id; IN: Location ID 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 hid_t space_id; 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 H5Rcreate(void *ref, hid_t loc_id, const char *name, H5R_type_t ref_type, hid_t space_id) { H5G_loc_t loc; /* File location */ H5S_t *space = NULL; /* Pointer to dataspace containing region */ herr_t ret_value; /* Return value */ FUNC_ENTER_API(FAIL) H5TRACE5("e", "*xi*sRti", ref, loc_id, name, ref_type, space_id); /* Check args */ if(ref == NULL) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference pointer") if(H5G_loc(loc_id, &loc) < 0) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location") if(!name || !*name) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name given") if(ref_type <= H5R_BADTYPE || ref_type >= H5R_MAXTYPE) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference type") if(ref_type != H5R_OBJECT && ref_type != H5R_DATASET_REGION) HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "reference type not supported") if(space_id == (-1) && ref_type == H5R_DATASET_REGION) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "reference region dataspace id must be valid") if(space_id != (-1) && (NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace") /* Create reference */ if((ret_value = H5R_create(ref, &loc, name, ref_type, space, H5AC_dxpl_id)) < 0) HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable to create reference") done: FUNC_LEAVE_API(ret_value) } /* end H5Rcreate() */ /*-------------------------------------------------------------------------- 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 --------------------------------------------------------------------------*/ static hid_t H5R_dereference(H5F_t *file, 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; /* 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 */ 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(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); } /* end case */ 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") /* 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") } /* end if */ } /* end case */ 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") } /* end if */ } /* end case */ break; case H5O_TYPE_DATASET: { hid_t dapl_id = H5P_DATASET_ACCESS_DEFAULT; /* dapl to use to open dataset */ H5D_t *dset; /* Pointer to dataset to open */ /* Open the dataset */ if(NULL == (dset = H5D_open(&loc, dapl_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") } /* end if */ } /* end case */ 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 H5Rdereference PURPOSE Opens the HDF5 object referenced. USAGE hid_t H5Rdereference(ref) hid_t id; IN: Dataset reference object is in or location ID of object that the dataset is located within. H5R_type_t ref_type; IN: Type of reference to create 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 EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ hid_t H5Rdereference(hid_t id, H5R_type_t ref_type, const void *_ref) { H5G_loc_t loc; /* Group location */ H5F_t *file = NULL; /* File object */ hid_t ret_value; FUNC_ENTER_API(FAIL) H5TRACE3("i", "iRt*x", id, ref_type, _ref); /* Check args */ if(H5G_loc(id, &loc) < 0) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location") if(ref_type <= H5R_BADTYPE || ref_type >= H5R_MAXTYPE) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference type") if(_ref == NULL) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference pointer") /* Get the file pointer from the entry */ file = loc.oloc->file; /* Create reference */ if((ret_value = H5R_dereference(file, H5AC_dxpl_id, ref_type, _ref, TRUE)) < 0) HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable to dereference object") done: FUNC_LEAVE_API(ret_value) } /* end H5Rdereference() */ /*-------------------------------------------------------------------------- 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 --------------------------------------------------------------------------*/ static 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 H5Rget_region PURPOSE Retrieves a dataspace with the region pointed to selected. USAGE hid_t H5Rget_region(id, ref_type, ref) hid_t id; IN: Dataset reference object is in or location ID of object that the dataset is located within. H5R_type_t ref_type; IN: Type of reference to get region of void *ref; IN: Reference to open. RETURNS Valid ID on success, Negative 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 --------------------------------------------------------------------------*/ hid_t H5Rget_region(hid_t id, H5R_type_t ref_type, const void *ref) { H5G_loc_t loc; /* Object's group location */ H5S_t *space = NULL; /* Dataspace object */ hid_t ret_value; FUNC_ENTER_API(FAIL) H5TRACE3("i", "iRt*x", id, ref_type, ref); /* Check args */ if(H5G_loc(id, &loc) < 0) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location") if(ref_type != H5R_DATASET_REGION) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference type") if(ref == NULL) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference pointer") /* Get the dataspace with the correct region selected */ if((space = H5R_get_region(loc.oloc->file, H5AC_ind_dxpl_id, ref)) == NULL) HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create dataspace") /* Atomize */ if((ret_value = H5I_register (H5I_DATASPACE, space, TRUE)) < 0) HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register dataspace atom") done: FUNC_LEAVE_API(ret_value) } /* end H5Rget_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); } /* end case */ 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 H5Rget_obj_type2 PURPOSE Retrieves the type of object that an object reference points to USAGE herr_t H5Rget_obj_type2(id, ref_type, ref, obj_type) hid_t id; IN: Dataset reference object is in or location ID of object that the dataset is located within. H5R_type_t ref_type; IN: Type of reference to query void *ref; IN: Reference to query. H5O_type_t *obj_type; OUT: Type of object reference points to RETURNS Non-negative on success/Negative on failure DESCRIPTION Given a reference to some object, this function retrieves the type of object pointed to. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5Rget_obj_type2(hid_t id, H5R_type_t ref_type, const void *ref, H5O_type_t *obj_type) { H5G_loc_t loc; /* Object location */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_API(FAIL) H5TRACE4("e", "iRt*x*Ot", id, ref_type, ref, obj_type); /* Check args */ if(H5G_loc(id, &loc) < 0) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location") if(ref_type <= H5R_BADTYPE || ref_type >= H5R_MAXTYPE) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference type") if(ref == NULL) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference pointer") /* Get the object information */ if(H5R_get_obj_type(loc.oloc->file, H5AC_ind_dxpl_id, ref_type, ref, obj_type) < 0) HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable to determine object type") done: FUNC_LEAVE_API(ret_value) } /* end H5Rget_obj_type2() */ /*-------------------------------------------------------------------------- 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 --------------------------------------------------------------------------*/ static 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 = (-1); /* ID for file that the reference is in */ H5O_loc_t oloc; /* Object location describing object for reference */ ssize_t ret_value; /* Return value */ FUNC_ENTER_NOAPI_NOINIT /* Check args */ HDassert(f); HDassert(_ref); HDassert(name); /* 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); } /* end case */ 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() */ /*-------------------------------------------------------------------------- NAME H5Rget_name PURPOSE Determines a name for the object referenced USAGE ssize_t H5Rget_name(loc_id, ref_type, ref, name, size) hid_t loc_id; IN: Dataset reference object is in or location ID of object that the dataset is located within. 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 H5Rget_name(hid_t id, H5R_type_t ref_type, const void *_ref, char *name, size_t size) { H5G_loc_t loc; /* Group location */ H5F_t *file; /* File object */ ssize_t ret_value; /* Return value */ FUNC_ENTER_API(FAIL) H5TRACE5("Zs", "iRt*x*sz", id, ref_type, _ref, name, size); /* Check args */ if(H5G_loc(id, &loc) < 0) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location") if(ref_type <= H5R_BADTYPE || ref_type >= H5R_MAXTYPE) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference type") if(_ref == NULL) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference pointer") /* Get the file pointer from the entry */ file = loc.oloc->file; /* Get name */ if((ret_value = H5R_get_name(file, H5P_DEFAULT, H5AC_dxpl_id, id, ref_type, _ref, name, size)) < 0) HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable to determine object path") done: FUNC_LEAVE_API(ret_value) } /* end H5Rget_name() */