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hdf5/src/H5R.c
Quincey Koziol d0abb4a760 [svn-r9333] Purpose: 
Bug fix

Description:
    Fix another couple of int <-> pointer checks.

Platforms tested:
    AIX 5.1 (copper)
    Too minor to require h5committest
2004-09-28 14:54:12 -05:00

768 lines
28 KiB
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#define H5F_PACKAGE /*suppress error about including H5Fpkg */
/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC H5R_init_interface
/* Pablo information */
/* (Put before include files to avoid problems with inline functions) */
#define PABLO_MASK H5R_mask
#include "H5private.h" /* Generic Functions */
#include "H5Iprivate.h" /* ID Functions */
#include "H5Dprivate.h" /* Datasets */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fpkg.h" /* Files */
#include "H5Gprivate.h" /* Groups */
#include "H5HGprivate.h" /* Global Heaps */
#include "H5MMprivate.h" /* Memory Management */
#include "H5Rprivate.h" /* References */
#include "H5Sprivate.h" /* Dataspace functions */
#include "H5Tprivate.h" /* Datatypes */
/* Static functions */
static herr_t H5R_create(void *ref, H5G_entry_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, void *_ref);
static H5S_t * H5R_get_region(H5F_t *file, hid_t dxpl_id, H5R_type_t ref_type, void *_ref);
static H5G_obj_t H5R_get_obj_type(H5F_t *file, hid_t dxpl_id, H5R_type_t ref_type, void *_ref);
/*--------------------------------------------------------------------------
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(H5R_init_interface);
/* Initialize the atom group for the file IDs */
if (H5I_register_type(H5I_REFERENCE, H5I_REFID_HASHSIZE, H5R_RESERVED_ATOMS,
(H5I_free_t)NULL)<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_NOFUNC(H5R_term_interface);
if (H5_interface_initialize_g) {
if ((n=H5I_nmembers(H5I_REFERENCE))) {
H5I_clear_type(H5I_REFERENCE, FALSE);
} else {
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_entry_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_entry_t *loc, const char *name, H5R_type_t ref_type, H5S_t *space, hid_t dxpl_id)
{
H5G_stat_t sb; /* Stat buffer for retrieving OID */
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5R_create);
assert(_ref);
assert(loc);
assert(name);
assert(ref_type>H5R_BADTYPE || ref_type<H5R_MAXTYPE);
if (H5G_get_objinfo (loc, name, 0, &sb, dxpl_id)<0)
HGOTO_ERROR (H5E_REFERENCE, H5E_NOTFOUND, FAIL, "unable to stat object");
switch(ref_type) {
case H5R_OBJECT:
{
hobj_ref_t *ref=(hobj_ref_t *)_ref; /* Get pointer to correct type of reference struct */
*ref=sb.objno;
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(loc->file->shared->gc_ref) {
/* 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,H5R_DSET_REG_REF_BUF_SIZE,0);
/* 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+=sizeof(haddr_t);
/* Allocate the space to store the serialized information */
H5_CHECK_OVERFLOW(buf_size,hssize_t,size_t);
if (NULL==(buf = H5MM_malloc((size_t)buf_size)))
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
/* Serialize information for dataset OID */
p=(uint8_t *)buf;
H5F_addr_encode(loc->file,&p,sb.objno);
/* Serialize the selection */
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->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->file,&p,hobjid.addr);
INT32ENCODE(p,hobjid.idx);
/* Free the buffer we serialized data in */
H5MM_xfree(buf);
break;
}
case H5R_INTERNAL:
HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "Internal references are not yet supported");
case H5R_BADTYPE:
case H5R_MAXTYPE:
default:
assert("unknown reference type" && 0);
HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)");
} /* end switch */
done:
FUNC_LEAVE_NOAPI(ret_value);
} /* end H5R_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_entry_t *loc = NULL; /* File location */
H5S_t *space = NULL; /* Pointer to dataspace containing region */
herr_t ret_value; /* Return value */
FUNC_ENTER_API(H5Rcreate, FAIL);
H5TRACE5("e","xisRti",ref,loc_id,name,ref_type,space_id);
/* Check args */
if(ref==NULL)
HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "invalid reference pointer");
if (NULL==(loc=H5G_loc (loc_id)))
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) && (NULL==(space=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, void *_ref)
{
H5D_t *dset; /* Pointer to dataset to open */
H5T_t *type; /* Pointer to datatype to open */
H5G_t *group; /* Pointer to group to open */
H5G_entry_t ent; /* Symbol table entry */
uint8_t *p; /* Pointer to OID to store */
int oid_type; /* type of object being dereferenced */
hid_t ret_value;
FUNC_ENTER_NOAPI_NOINIT(H5R_dereference);
assert(_ref);
assert(ref_type>H5R_BADTYPE || ref_type<H5R_MAXTYPE);
assert(file);
/* Initialize the symbol table entry */
HDmemset(&ent,0,sizeof(H5G_entry_t));
ent.type=H5G_NOTHING_CACHED;
ent.file=file;
switch(ref_type) {
case H5R_OBJECT:
{
hobj_ref_t *ref=(hobj_ref_t *)_ref; /* Only object references currently supported */
ent.header=*ref;
} /* end case */
break;
case H5R_DATASET_REGION:
{
hdset_reg_ref_t *ref=(hdset_reg_ref_t *)_ref; /* Get pointer to correct type of reference struct */
H5HG_t hobjid; /* Heap object ID */
uint8_t *buf; /* Buffer to store serialized selection in */
/* Get the heap ID for the dataset region */
p=(uint8_t *)ref;
H5F_addr_decode(ent.file,(const uint8_t **)&p,&(hobjid.addr));
INT32DECODE(p,hobjid.idx);
/* Get the dataset region from the heap (allocate inside routine) */
if((buf=H5HG_read(ent.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=(uint8_t *)buf;
H5F_addr_decode(ent.file,(const uint8_t **)&p,&(ent.header));
/* Free the buffer allocated in H5HG_read() */
H5MM_xfree(buf);
} /* end case */
break;
case H5R_INTERNAL:
HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "Internal references are not yet supported");
case H5R_BADTYPE:
case H5R_MAXTYPE:
default:
assert("unknown reference type" && 0);
HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, FAIL, "internal error (unknown reference type)");
} /* end switch */
/* Check to make certain that this object hasn't been deleted since the reference was created */
if(H5O_link(&ent,0,dxpl_id)<=0)
HGOTO_ERROR(H5E_REFERENCE, H5E_LINKCOUNT, FAIL, "dereferencing deleted object");
/* Open the object */
oid_type=H5G_get_type(&ent,dxpl_id);
switch(oid_type) {
case H5G_GROUP:
if ((group=H5G_open(&ent,dxpl_id)) == NULL)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "not found");
/* Create an atom for the group */
if ((ret_value = H5I_register(H5I_GROUP, group)) < 0) {
H5G_close(group);
HGOTO_ERROR(H5E_SYM, H5E_CANTREGISTER, FAIL, "can't register group");
}
break;
case H5G_TYPE:
if ((type=H5T_open(&ent, dxpl_id)) == NULL)
HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, FAIL, "not found");
/* Create an atom for the datatype */
if ((ret_value = H5I_register(H5I_DATATYPE, type)) < 0) {
H5T_close(type);
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "can't register datatype");
}
break;
case H5G_DATASET:
/* Open the dataset */
if ((dset=H5D_open(&ent,dxpl_id))==NULL)
HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, FAIL, "not found");
/* Create an atom for the dataset */
if ((ret_value = H5I_register(H5I_DATASET, dset)) < 0) {
H5D_close(dset);
HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "can't register dataset");
}
break;
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, void *_ref)
{
H5G_entry_t *loc = NULL; /* Symbol table entry */
H5F_t *file=NULL; /* File object */
hid_t ret_value;
FUNC_ENTER_API(H5Rdereference, FAIL);
H5TRACE3("i","iRtx",id,ref_type,_ref);
/* Check args */
if (NULL == (loc = H5G_loc(id)))
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->file;
/* Create reference */
if ((ret_value=H5R_dereference(file, H5AC_dxpl_id, ref_type, _ref))<0)
HGOTO_ERROR (H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable 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
H5R_type_t ref_type; UNUSED
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, H5R_type_t UNUSED ref_type, void *_ref)
{
H5G_entry_t ent; /* Symbol table entry */
uint8_t *p; /* Pointer to OID to store */
hdset_reg_ref_t *ref=(hdset_reg_ref_t *)_ref; /* Get pointer to correct type of reference struct */
H5HG_t hobjid; /* Heap object ID */
uint8_t *buf; /* Buffer to store serialized selection in */
H5S_t *ret_value;
FUNC_ENTER_NOAPI_NOINIT(H5R_get_region);
assert(_ref);
assert(ref_type==H5R_DATASET_REGION);
assert(file);
/* Initialize the symbol table entry */
HDmemset(&ent,0,sizeof(H5G_entry_t));
ent.type=H5G_NOTHING_CACHED;
ent.file=file;
/* Get the heap ID for the dataset region */
p=(uint8_t *)ref;
H5F_addr_decode(ent.file,(const uint8_t **)&p,&(hobjid.addr));
INT32DECODE(p,hobjid.idx);
/* Get the dataset region from the heap (allocate inside routine) */
if((buf=H5HG_read(ent.file,dxpl_id,&hobjid,NULL))==NULL)
HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, NULL, "Unable to read dataset region information");
/* Get the object oid for the dataset */
p=(uint8_t *)buf;
H5F_addr_decode(ent.file,(const uint8_t **)&p,&(ent.header));
/* Open and copy the dataset's dataspace */
if ((ret_value=H5S_read(&ent, 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");
/* Free the buffer allocated in H5HG_read() */
H5MM_xfree(buf);
done:
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, void *_ref)
{
H5G_entry_t *loc = NULL; /* Symbol table entry */
H5S_t *space = NULL; /* dataspace object */
H5F_t *file=NULL; /* File object */
hid_t ret_value;
FUNC_ENTER_API(H5Rget_region, FAIL);
H5TRACE3("i","iRtx",id,ref_type,_ref);
/* Check args */
if (NULL == (loc = H5G_loc(id)))
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 file pointer from the entry */
file=loc->file;
/* Get the dataspace with the correct region selected */
if ((space=H5R_get_region(file,H5AC_ind_dxpl_id,ref_type,_ref))==NULL)
HGOTO_ERROR (H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create dataspace");
/* Atomize */
if ((ret_value=H5I_register (H5I_DATASPACE, space))<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
H5G_obj_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
--------------------------------------------------------------------------*/
static H5G_obj_t
H5R_get_obj_type(H5F_t *file, hid_t dxpl_id, H5R_type_t ref_type, void *_ref)
{
H5G_entry_t ent; /* Symbol table entry */
uint8_t *p; /* Pointer to OID to store */
H5G_obj_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5R_get_obj_type);
assert(file);
assert(_ref);
/* Initialize the symbol table entry */
HDmemset(&ent,0,sizeof(H5G_entry_t));
ent.type=H5G_NOTHING_CACHED;
ent.file=file;
switch(ref_type) {
case H5R_OBJECT:
{
hobj_ref_t *ref=(hobj_ref_t *)_ref; /* Only object references currently supported */
/* Get the object oid */
ent.header=*ref;
} /* end case */
break;
case H5R_DATASET_REGION:
{
hdset_reg_ref_t *ref=(hdset_reg_ref_t *)_ref; /* Get pointer to correct type of reference struct */
H5HG_t hobjid; /* Heap object ID */
uint8_t *buf; /* Buffer to store serialized selection in */
/* Get the heap ID for the dataset region */
p=(uint8_t *)ref;
H5F_addr_decode(ent.file,(const uint8_t **)&p,&(hobjid.addr));
INT32DECODE(p,hobjid.idx);
/* Get the dataset region from the heap (allocate inside routine) */
if((buf=H5HG_read(ent.file,dxpl_id,&hobjid,NULL))==NULL)
HGOTO_ERROR(H5E_REFERENCE, H5E_READERROR, H5G_UNKNOWN, "Unable to read dataset region information");
/* Get the object oid for the dataset */
p=(uint8_t *)buf;
H5F_addr_decode(ent.file,(const uint8_t **)&p,&(ent.header));
/* Free the buffer allocated in H5HG_read() */
H5MM_xfree(buf);
} /* end case */
break;
case H5R_INTERNAL:
HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, H5G_UNKNOWN, "Internal references are not yet supported");
case H5R_BADTYPE:
case H5R_MAXTYPE:
default:
assert("unknown reference type" && 0);
HGOTO_ERROR(H5E_REFERENCE, H5E_UNSUPPORTED, H5G_UNKNOWN, "internal error (unknown reference type)");
} /* end switch */
/* Check to make certain that this object hasn't been deleted since the reference was created */
if(H5O_link(&ent,0,dxpl_id)<=0)
HGOTO_ERROR(H5E_REFERENCE, H5E_LINKCOUNT, H5G_UNKNOWN, "dereferencing deleted object");
/* Get the OID type */
ret_value=H5G_get_type(&ent,dxpl_id);
done:
FUNC_LEAVE_NOAPI(ret_value);
} /* end H5R_get_obj_type() */
/*--------------------------------------------------------------------------
NAME
H5Rget_obj_type
PURPOSE
Retrieves the type of object that an object reference points to
USAGE
int H5Rget_obj_type(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 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
--------------------------------------------------------------------------*/
H5G_obj_t
H5Rget_obj_type(hid_t id, H5R_type_t ref_type, void *_ref)
{
H5G_entry_t *loc = NULL; /* Symbol table entry */
H5F_t *file=NULL; /* File object */
H5G_obj_t ret_value;
FUNC_ENTER_API(H5Rget_obj_type, H5G_UNKNOWN);
H5TRACE3("Go","iRtx",id,ref_type,_ref);
/* Check args */
if (NULL == (loc = H5G_loc(id)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "not a location");
if(ref_type<=H5R_BADTYPE || ref_type>=H5R_MAXTYPE)
HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, H5G_UNKNOWN, "invalid reference type");
if(_ref==NULL)
HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, H5G_UNKNOWN, "invalid reference pointer");
/* Get the file pointer from the entry */
file=loc->file;
/* Get the object information */
if ((ret_value=H5R_get_obj_type(file,H5AC_ind_dxpl_id,ref_type,_ref))<0)
HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, H5G_UNKNOWN, "unable to determine object type");
done:
FUNC_LEAVE_API(ret_value);
} /* end H5Rget_obj_type() */
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