/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Copyright by The HDF Group. * * All rights reserved. * * * * This file is part of HDF5. The full HDF5 copyright notice, including * * terms governing use, modification, and redistribution, is contained in * * the COPYING file, which can be found at the root of the source code * * distribution tree, or in https://www.hdfgroup.org/licenses. * * If you do not have access to either file, you may request a copy from * * help@hdfgroup.org. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* * This file contains public declarations for the H5R module. */ #ifndef H5Rpublic_H #define H5Rpublic_H /* Public headers needed by this file */ #include "H5public.h" #include "H5Gpublic.h" #include "H5Ipublic.h" /*****************/ /* Public Macros */ /*****************/ /* Deprecated reference buffer sizes that are kept for backward compatibility */ #define H5R_OBJ_REF_BUF_SIZE sizeof(haddr_t) #define H5R_DSET_REG_REF_BUF_SIZE (sizeof(haddr_t) + 4) /** * Default reference buffer size. * * \internal Note! Be careful with the sizes of the references because they * should really depend on the run-time values in the file. */ #define H5R_REF_BUF_SIZE (64) /*******************/ /* Public Typedefs */ /*******************/ //! /** * Reference types allowed. * * \internal DO NOT CHANGE THE ORDER or VALUES as reference type values are * encoded into the datatype message header. */ typedef enum { H5R_BADTYPE = (-1), /**< Invalid reference type */ H5R_OBJECT1 = 0, /**< Backward compatibility (object) */ H5R_DATASET_REGION1 = 1, /**< Backward compatibility (region) */ H5R_OBJECT2 = 2, /**< Object reference */ H5R_DATASET_REGION2 = 3, /**< Region reference */ H5R_ATTR = 4, /**< Attribute Reference */ H5R_MAXTYPE = 5 /**< Highest type (invalid) */ } H5R_type_t; //! /* Deprecated types are kept for backward compatibility with previous versions */ //! /** * \deprecated Deprecated object reference type that is used with deprecated * reference APIs. * * \note This type can only be used with the "native" HDF5 VOL connector. */ typedef haddr_t hobj_ref_t; //! //! /** * Buffer to store heap ID and index * * This needs to be large enough to store largest #haddr_t in a worst case * machine (8 bytes currently) plus an int. * * \deprecated Dataset region reference type that is used with deprecated * reference APIs. * * \note This type can only be used with the "native" HDF5 VOL connector. */ typedef struct { uint8_t __data[H5R_DSET_REG_REF_BUF_SIZE]; } hdset_reg_ref_t; //! //! /** * Opaque reference type. The same reference type is used for object, * dataset region and attribute references. This is the type that * should always be used with the current reference API. */ typedef struct { union { uint8_t __data[H5R_REF_BUF_SIZE]; /**< opaque data */ int64_t align; /**< ensures alignment */ } u; } H5R_ref_t; //! /********************/ /* Public Variables */ /********************/ /*********************/ /* Public Prototypes */ /*********************/ #ifdef __cplusplus extern "C" { #endif /* Constructors */ /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Creates an object reference * * \fgdta_loc_id * \param[in] name Name of object * \oapl_id * \param[out] ref_ptr Pointer to reference * * \return \herr_t * * \details H5Rcreate_object() creates a reference pointing to the * object named \p name located at \p loc_id. The parameters \p * loc_id and \p name are used to locate the object. * * The parameter \p oapl_id is an object access property list * identifier for the referenced object. The access property list * must be of the same type as the object being referenced, that is * a group, dataset or committed datatype property list. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * * H5Rdestroy() should be used to release the resource from the * reference. * */ H5_DLL herr_t H5Rcreate_object(hid_t loc_id, const char *name, hid_t oapl_id, H5R_ref_t *ref_ptr); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Creates a region reference * * \fgdta_loc_id * \param[in] name Name of object * \space_id * \oapl_id * \param[out] ref_ptr Pointer to reference * * \return \herr_t * * \details H5Rcreate_region() creates the reference, \p ref_ptr, * pointing to the region represented by \p space_id within the * object named name located at \p loc_id. * * The parameters \p loc_id and \p name are used to locate the * object. The parameter \p space_id identifies the dataset region * that a dataset region reference points to. * * The parameter \p oapl_id is an object access property list * identifier for the referenced object. The access property list * must be of the same type as the object being referenced, that is * a dataset property list in this case. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * * H5Rdestroy() should be used to release the resource from the * reference. * */ H5_DLL herr_t H5Rcreate_region(hid_t loc_id, const char *name, hid_t space_id, hid_t oapl_id, H5R_ref_t *ref_ptr); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Creates an attribute reference * * \fgdta_loc_id * \param[in] name Name of object * \param[in] attr_name Name of attribute * \oapl_id * \param[out] ref_ptr Pointer to reference * * \return \herr_t * * \details H5Rcreate_attr() creates the reference, \p ref_ptr, pointing * to the attribute named \p attr_name and attached to the object * named \p name located at \p loc_id. * * The parameters \p loc_id and \p name locate the object. The * parameter \p attr_name specifies the attribute within the object. * * The parameter \p oapl_id is an object access property list * identifier for the object that the referenced attribute is * attached to. The access property list must be of the same type * as that object, that is a group, dataset or committed datatype * property list. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * * H5Rdestroy() should be used to release the resource from the * reference. * */ H5_DLL herr_t H5Rcreate_attr(hid_t loc_id, const char *name, const char *attr_name, hid_t oapl_id, H5R_ref_t *ref_ptr); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Closes a reference * * \param[in] ref_ptr Pointer to reference * * \return \herr_t * * \details Given a reference, \p ref_ptr, to an object, region or attribute * attached to an object, H5Rdestroy() releases allocated resources * from a previous create call. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * */ H5_DLL herr_t H5Rdestroy(H5R_ref_t *ref_ptr); /* Info */ /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the type of a reference * * \param[in] ref_ptr Pointer to reference * * \return Returns a valid reference type if successful; otherwise returns #H5R_BADTYPE . * * \details Given a reference, \p ref_ptr, H5Rget_type() returns the * type of the reference. * * Valid returned reference types are: * \snippet this H5R_type_t_snip * * Note that #H5R_OBJECT1 and #H5R_DATASET_REGION1 can never be * associated to an \ref H5R_ref_t reference and can therefore never be * returned through that function. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * */ H5_DLL H5R_type_t H5Rget_type(const H5R_ref_t *ref_ptr); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Determines whether two references are equal * * \param[in] ref1_ptr Pointer to reference to compare * \param[in] ref2_ptr Pointer to reference to compare * * \return Returns a positive value if the references are equal. Returns * 0 if the references are not equal. Returns a negative value when the * function fails. * * \details H5Requal() determines whether two references point to the * same object, region or attribute. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * */ H5_DLL htri_t H5Requal(const H5R_ref_t *ref1_ptr, const H5R_ref_t *ref2_ptr); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Copies an existing reference * * \param[in] src_ref_ptr Pointer to reference to copy * \param[out] dst_ref_ptr Pointer to output reference * * \return \herr_t * * \details H5Rcopy() creates a copy of an existing reference. * \p src_ref_ptr points to the reference to copy and \p dst_ref_ptr is the * pointer to the destination reference. * */ H5_DLL herr_t H5Rcopy(const H5R_ref_t *src_ref_ptr, H5R_ref_t *dst_ref_ptr); /* Dereference */ /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Opens the HDF5 object referenced * * \param[in] ref_ptr Pointer to reference to open * \rapl_id * \oapl_id * * \return \hid_t{object} * * \details Given a reference, \p ref_ptr, to an object, a region in * an object, or an attribute attached to an object, H5Ropen_object() * opens that object and returns an identifier. * * The parameter \p oapl_id is an object access property list * identifier for the referenced object. The access property list * must be of the same type as the object being referenced, that is * a group or dataset property list. * * \ref H5R_ref_t is defined in H5Rpublic.h as: * \snippet this H5R_ref_t_snip * * The object opened with this function should be closed when it * is no longer needed so that resource leaks will not develop. Use * the appropriate close function such as H5Oclose() or H5Dclose() * for datasets. * */ H5_DLL hid_t H5Ropen_object(H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t oapl_id); /** * -------------------------------------------------------------------------- * \ingroup ASYNC * \async_variant_of{H5Ropen_object} */ #ifndef H5_DOXYGEN H5_DLL hid_t H5Ropen_object_async(const char *app_file, const char *app_func, unsigned app_line, H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t oapl_id, hid_t es_id); #else H5_DLL hid_t H5Ropen_object_async(unsigned app_line, H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t oapl_id, hid_t es_id); #endif /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Sets up a dataspace and selection as specified by a region reference. * * \param[in] ref_ptr Pointer to reference to open * \rapl_id * \oapl_id * * \return \hid_t{dataspace} * * \details H5Ropen_region() creates a copy of the dataspace of the * dataset pointed to by a region reference, \p ref_ptr, and defines * a selection matching the selection pointed to by \p ref_ptr within * the dataspace copy. * * The parameter \p rapl id is a reference access property list * identifier for the reference. The access property list can * be used to access external files that the reference points to * (through a file access property list). * * The parameter \p oapl id is an object access property list * identifier for the referenced object. The access property list * must be of the same type as the object being referenced, that is * a dataset property list in that case. * * Use H5Sclose() to release the dataspace identifier returned by * this function when the identifier is no longer needed. * */ H5_DLL hid_t H5Ropen_region(H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t oapl_id); /** * -------------------------------------------------------------------------- * \ingroup ASYNC * \async_variant_of{H5Ropen_region} */ #ifndef H5_DOXYGEN H5_DLL hid_t H5Ropen_region_async(const char *app_file, const char *app_func, unsigned app_line, H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t oapl_id, hid_t es_id); #else H5_DLL hid_t H5Ropen_region_async(H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t oapl_id, hid_t es_id); #endif /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Opens the HDF5 attribute referenced * * \param[in] ref_ptr Pointer to reference to open * \rapl_id * \aapl_id * * \return \hid_t{attribute} * * \details Given a reference, \p ref_ptr, to an attribute attached to * an object, H5Ropen_attr() opens the attribute attached to that * object and returns an identifier. * * The parameter \p rapl id is a reference access property list * identifier for the reference. The access property list can * be used to access external files that the reference points to * (through a file access property list). * * The parameter \p aapl_id is an attribute access property list * identifier for the referenced attribute. * * The attribute opened with this function should be closed with * H5Aclose() when it is no longer needed. * */ H5_DLL hid_t H5Ropen_attr(H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t aapl_id); /** * -------------------------------------------------------------------------- * \ingroup ASYNC * \async_variant_of{H5Ropen_attr} */ #ifndef H5_DOXYGEN H5_DLL hid_t H5Ropen_attr_async(const char *app_file, const char *app_func, unsigned app_line, H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t aapl_id, hid_t es_id); #else H5_DLL hid_t H5Ropen_attr_async(H5R_ref_t *ref_ptr, hid_t rapl_id, hid_t aapl_id, hid_t es_id); #endif /* Get type */ /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the type of object that an object reference points to * * \param[in] ref_ptr Pointer to reference to query * \rapl_id * \param[out] obj_type Type of referenced object * * \return \herr_t * * \details Given a reference, \p ref_ptr, H5Rget_obj_type3() retrieves * the type of the referenced object in \p obj_type. * * The parameter \p rapl id is a reference access property list * identifier for the reference. The access property list can * be used to access external files that the reference points to * (through a file access property list). * * Upon success, the function returns in \p obj_type the type of * the object that the reference points to. Valid values for this * referenced object type are as followed (defined in H5Opublic.h): * \snippet H5Opublic.h H5O_type_t_snip * */ H5_DLL herr_t H5Rget_obj_type3(H5R_ref_t *ref_ptr, hid_t rapl_id, H5O_type_t *obj_type); /* Get name */ /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the file name for a referenced object * * \param[in] ref_ptr Pointer to reference to query * \param[in,out] name Buffer to place the file name of the reference * \param[in] size Size of the \p name buffer * * \return Returns the length of the name if successful, otherwise, a negative value. * * \details H5Rget_file_name() retrieves the file name for the object, * region or attribute reference pointed to by \p ref_ptr. * * Up to \p size characters of the name are returned in \p name; * additional characters, if any, are not returned to the user * application. If the length of the name, which determines * the required value of size, is unknown, a preliminary * H5Rget_file_name() call can be made. The return value of this * call will be the size of the file name. That value can then be * passed in for size in the second call to H5Rget_file_name(), * which will retrieve the actual name. * */ H5_DLL ssize_t H5Rget_file_name(const H5R_ref_t *ref_ptr, char *name, size_t size); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the object name for a referenced object * * \param[in] ref_ptr Pointer to reference to query * \rapl_id * \param[in,out] name Buffer to place the file name of the reference * \param[in] size Size of the \p name buffer * * \return Returns the length of the name if successful, returning * 0 (zero) if no name is associated with the identifier. Otherwise * returns a negative value. * * \details H5Rget_obj_name() retrieves the object name for the object, * region or attribute reference pointed to by \p ref_ptr. * * The parameter \p rapl_id is a reference access property list * identifier for the reference. The access property list can * be used to access external files that the reference points to * (through a file access property list). * * Up to size characters of the name are returned in \p name; additional * characters, if any, are not returned to the user application. If * the length of the name, which determines the required value of * \p size, is unknown, a preliminary call to H5Rget_obj_name() call * can be made. The return value of this call will be the size of the * object name. That value can then be passed in for \p size in the * second call to H5Rget_obj_name(), which will retrieve the actual * name. If there is no name associated with the object identifier * or if the name is NULL, H5Rget_obj_name() returns the size of * the name buffer (the size does not include the \c \0 terminator). * * If \p ref_ptr is an object reference, \p name will be returned with * a name for the referenced object. If \p ref_ptr is a dataset region * reference, \p name will contain a name for the object containing * the referenced region. If \p ref_ptr is an attribute reference, \p * name will contain a name for the object the attribute is attached * to. Note that an object in an HDF5 file may have multiple paths * if there are multiple links pointing to it. This function may * return any one of these paths. * */ H5_DLL ssize_t H5Rget_obj_name(H5R_ref_t *ref_ptr, hid_t rapl_id, char *name, size_t size); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the attribute name for a referenced object * * \param[in] ref_ptr Pointer to reference to query * \param[in,out] name Buffer to place the attribute name of the reference * \param[in] size Size of the \p name buffer * * \return Returns the length of the name if successful, otherwise, a negative value. * * \details H5Rget_attr_name() retrieves the attribute name for the * attribute reference pointed to by \p ref_ptr. * * Up to size characters of the name are returned in \p name; * additional characters, if any, are not returned to the user * application. If the length of the name, which determines * the required value of \p size, is unknown, a preliminary * H5Rget_attr_name() call can be made. The return value of this * call will be the size of the attribute name. That value can then * be passed in for size in the second call to H5Rget_attr_name(), * which will retrieve the actual name. * */ H5_DLL ssize_t H5Rget_attr_name(const H5R_ref_t *ref_ptr, char *name, size_t size); /// \cond DEV /* API Wrappers for async routines */ /* (Must be defined _after_ the function prototype) */ /* (And must only defined when included in application code, not the library) */ #ifndef H5R_MODULE #define H5Ropen_object_async(...) H5Ropen_object_async(__FILE__, __func__, __LINE__, __VA_ARGS__) #define H5Ropen_region_async(...) H5Ropen_region_async(__FILE__, __func__, __LINE__, __VA_ARGS__) #define H5Ropen_attr_async(...) H5Ropen_attr_async(__FILE__, __func__, __LINE__, __VA_ARGS__) /* Define "wrapper" versions of function calls, to allow compile-time values to * be passed in by language wrapper or library layer on top of HDF5. */ #define H5Ropen_object_async_wrap H5_NO_EXPAND(H5Ropen_object_async) #define H5Ropen_region_async_wrap H5_NO_EXPAND(H5Ropen_region_async) #define H5Ropen_attr_async_wrap H5_NO_EXPAND(H5Ropen_attr_async) #endif /* H5R_MODULE */ /// \endcond /* Symbols defined for compatibility with previous versions of the HDF5 API. * * Use of these symbols is or will be deprecated. */ /* Macros */ /* Versions for compatibility */ #define H5R_OBJECT H5R_OBJECT1 #define H5R_DATASET_REGION H5R_DATASET_REGION1 /* Function prototypes */ #ifndef H5_NO_DEPRECATED_SYMBOLS /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the type of object that an object reference points to * * \param[in] id The dataset containing the reference object or the group * containing that dataset * \param[in] ref_type Type of reference to query * \param[in] ref Reference to query * * \return Returns a valid object type if successful; otherwise returns a * negative value (#H5G_UNKNOWN). * * \deprecated This function has been renamed from H5Rget_obj_type() and is * deprecated in favor of the macro H5Rget_obj_type() or the * function H5Rget_obj_type2(). * * \details Given an object reference, \p ref, H5Rget_obj_type1() returns the * type of the referenced object. * * A \Emph{reference type} is the type of reference, either an object * reference or a dataset region reference. An \Emph{object reference} * points to an HDF5 object while a \Emph{dataset region reference} * points to a defined region within a dataset. * * The \Emph{referenced object} is the object the reference points * to. The \Emph{referenced object type}, or the type of the referenced * object, is the type of the object that the reference points to. * * The location identifier, \p id, is the identifier for either the * dataset containing the object reference or the group containing that * dataset. * * Valid reference types, to pass in as \p ref_type, include the * following: * \snippet this H5R_type_t_snip * * If the application does not already know the object reference type, * that can be determined with three preliminary calls: * * \li Call H5Dget_type() on the dataset containing the reference to * get a datatype identifier for the dataset’s datatype. * \li Using that datatype identifier, H5Tget_class() returns a datatype * class.\n If the datatype class is #H5T_REFERENCE, H5Tequal() can * then be used to determine whether the reference’s datatype is * #H5T_STD_REF_OBJ or #H5T_STD_REF_DSETREG: * - If the datatype is #H5T_STD_REF_OBJ, the reference object type * is #H5R_OBJECT. * - If the datatype is #H5T_STD_REF_DSETREG, the reference object * type is #H5R_DATASET_REGION. * * When the function completes successfully, it returns one of the * following valid object type values (defined in H5Gpublic.h): * \snippet H5Gpublic.h H5G_obj_t_snip * * \version 1.8.0 Function H5Rget_obj_type() renamed to H5Rget_obj_type1() and * deprecated in this release. * \since 1.6.0 * */ H5_DLL H5G_obj_t H5Rget_obj_type1(hid_t id, H5R_type_t ref_type, const void *ref); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Opens the HDF5 object referenced * * \obj_id * \param[in] ref_type The reference type of \p ref * \param[in] ref Reference to open * * \return Returns identifier of referenced object if successful; otherwise * returns a negative value. * * \deprecated This function has been renamed from H5Rdereference() and is * deprecated in favor of the macro H5Rdereference() or the function * H5Rdereference2(). * * \details Given a reference, \p ref, to an object or a region in an object, * H5Rdereference1() opens that object and returns an identifier. * * The parameter \p obj_id must be a valid identifier for an object in * the HDF5 file containing the referenced object, including the file * identifier. * * The parameter \p ref_type specifies the reference type of the * reference \p ref. \p ref_type may contain either of the following * values: * - #H5R_OBJECT * - #H5R_DATASET_REGION * * The object opened with this function should be closed when it is no * longer needed so that resource leaks will not develop. Use the * appropriate close function such as H5Oclose() or H5Dclose() for * datasets. * * \version 1.10.0 Function H5Rdereference() renamed to H5Rdereference1() and * deprecated in this release. * \since 1.8.0 * */ H5_DLL hid_t H5Rdereference1(hid_t obj_id, H5R_type_t ref_type, const void *ref); #endif /* H5_NO_DEPRECATED_SYMBOLS */ /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Creates a reference * * \param[out] ref Reference created by the function call * \param[in] loc_id Location identifier used to locate the object being pointed to * \param[in] name Name of object at location \p loc_id * \param[in] ref_type Type of reference * \param[in] space_id Dataspace identifier with selection. Used only for * dataset region references; pass as -1 if reference is * an object reference, i.e., of type #H5R_OBJECT * * \return \herr_t * * \details H5Rcreate() creates the reference, \p ref, of the type specified in * \p ref_type, pointing to the object \p name located at \p loc_id. * * The HDF5 library maps the void type specified above for \p ref to * the type specified in \p ref_type, which will be one of the following: * \snippet this H5R_type_t_snip * * The parameters \p loc_id and \p name are used to locate the object. * * The parameter \p space_id identifies the dataset region that a * dataset region reference points to. This parameter is used only with * dataset region references and should be set to -1 if the reference * is an object reference, #H5R_OBJECT. * * \since 1.8.0 */ H5_DLL herr_t H5Rcreate(void *ref, hid_t loc_id, const char *name, H5R_type_t ref_type, hid_t space_id); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves the type of object that an object reference points to * * \param[in] id The dataset containing the reference object or the group * containing that dataset * \param[in] ref_type Type of reference to query * \param[in] ref Reference to query * \param[out] obj_type Type of referenced object * * \return \herr_t * * \details Given an object reference, \p ref, H5Rget_obj_type2() returns the * type of the referenced object in \p obj_type. * * A \Emph{reference type} is the type of reference, either an object * reference or a dataset region reference. An \Emph{object reference} * points to an HDF5 object while a \Emph{dataset region reference} * points to a defined region within a dataset. * * The \Emph{referenced object} is the object the reference points * to. The \Emph{referenced object type}, or the type of the referenced * object, is the type of the object that the reference points to. * * The location identifier, \p id, is the identifier for either the * dataset containing the object reference or the group containing that * dataset. * * Valid reference types, to pass in as \p ref_type, include the * following: * \snippet this H5R_type_t_snip * * If the application does not already know the object reference type, * that can be determined with three preliminary calls: * * \li Call H5Dget_type() on the dataset containing the reference to * get a datatype identifier for the dataset’s datatype. * \li Using that datatype identifier, H5Tget_class() returns a datatype * class.\n If the datatype class is #H5T_REFERENCE, H5Tequal() can * then be used to determine whether the reference’s datatype is * #H5T_STD_REF_OBJ or #H5T_STD_REF_DSETREG: * - If the datatype is #H5T_STD_REF_OBJ, the reference object type * is #H5R_OBJECT. * - If the datatype is #H5T_STD_REF_DSETREG, the reference object * type is #H5R_DATASET_REGION. * * When the function completes successfully, it returns one of the * following valid object type values (defined in H5Opublic.h): * \snippet H5Opublic.h H5O_type_t_snip * * \since 1.8.0 * */ H5_DLL herr_t H5Rget_obj_type2(hid_t id, H5R_type_t ref_type, const void *ref, H5O_type_t *obj_type); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Opens the HDF5 object referenced * * \obj_id * \oapl_id * \param[in] ref_type The reference type of \p ref * \param[in] ref Reference to open * * \return Returns identifier of referenced object if successful; otherwise * returns a negative value. * * \details Given a reference, \p ref, to an object or a region in an object, * H5Rdereference2() opens that object and returns an identifier. * * The parameter \p obj_id must be a valid identifier for the HDF5 file * containing the referenced object or for any object in that HDF5 * file. * * The parameter \p oapl_id is an object access property list * identifier for the referenced object. The access property list must * be of the same type as the object being referenced, that is a group, * dataset, or datatype property list. * * The parameter \p ref_type specifies the reference type of the * reference \p ref. \p ref_type may contain either of the following * values: * - #H5R_OBJECT * - #H5R_DATASET_REGION * * The object opened with this function should be closed when it is no * longer needed so that resource leaks will not develop. Use the * appropriate close function such as H5Oclose() or H5Dclose() for * datasets. * * \since 1.10.0 * */ H5_DLL hid_t H5Rdereference2(hid_t obj_id, hid_t oapl_id, H5R_type_t ref_type, const void *ref); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Sets up a dataspace and selection as specified by a region reference * * \param[in] dataset File identifier or identifier for any object in the file * containing the referenced region * \param[in] ref_type Reference type of \p ref, which must be #H5R_DATASET_REGION * \param[in] ref Region reference to open * * \return Returns a valid dataspace identifier if successful; otherwise returns * a negative value. * * \details H5Rget_region() creates a copy of the dataspace of the dataset * pointed to by a region reference, \p ref, and defines a selection * matching the selection pointed to by ref within the dataspace copy. * * \p dataset is used to identify the file containing the referenced * region; it can be a file identifier or an identifier for any object * in the file. * * The parameter \p ref_type specifies the reference type of \p ref and * must contain the value #H5R_DATASET_REGION. * * Use H5Sclose() to release the dataspace identifier returned by this * function when the identifier is no longer needed. * */ H5_DLL hid_t H5Rget_region(hid_t dataset, H5R_type_t ref_type, const void *ref); /** * -------------------------------------------------------------------------- * \ingroup H5R * * \brief Retrieves a name for a referenced object * * \param[in] loc_id Identifier for the file containing the reference or for * any object in that file * \param[in] ref_type Type of reference * \param[in] ref An object or dataset region reference * \param[out] name A buffer to place the name of the referenced object or * dataset region. If \c NULL, then this call will return the * size in bytes of the name. * \param[in] size The size of the \p name buffer. When the size is passed in, * the \c NULL terminator needs to be included. * * \return Returns the length of the name if successful, returning 0 (zero) if * no name is associated with the identifier. Otherwise returns a * negative value. * * \details H5Rget_name() retrieves a name for the object identified by \p ref.\n * \p loc_id is used to identify the file containing the reference. It * can be the file identifier for the file containing the reference or * an identifier for any object in that file. * * \ref H5R_type_t is the reference type of \p ref. Valid values * include the following: * \snippet this H5R_type_t_snip * * \p ref is the reference for which the target object’s name is * sought. * * If \p ref is an object reference, \p name will be returned with a * name for the referenced object. If \p ref is a dataset region * reference, \p name will contain a name for the object containing the * referenced region. * * Up to \p size characters of the name are returned in \p name; * additional characters, if any, are not returned to the user * application. * * If the length of the name, which determines the required value of \p * size, is unknown, a preliminary H5Rget_name() call can be made. The * return value of this call will be the size of the object name. That * value can then be assigned to \p size for a second H5Rget_name() * call, which will retrieve the actual name. * * If there is no name associated with the object identifier or if the * \p name is \c NULL, H5Rget_name() returns the size of the \p name * buffer (the size does not include the \p NULL terminator). * * Note that an object in an HDF5 file may have multiple paths if there * are multiple links pointing to it. This function may return any one * of these paths. * * \since 1.8.0 */ H5_DLL ssize_t H5Rget_name(hid_t loc_id, H5R_type_t ref_type, const void *ref, char *name, size_t size); #ifdef __cplusplus } #endif #endif /* H5Rpublic_H */