diff options
Diffstat (limited to 'src/H5Rpublic.h')
| -rw-r--r-- | src/H5Rpublic.h | 356 |
1 files changed, 342 insertions, 14 deletions
diff --git a/src/H5Rpublic.h b/src/H5Rpublic.h index 1fc41ec..348a7a2 100644 --- a/src/H5Rpublic.h +++ b/src/H5Rpublic.h @@ -42,26 +42,39 @@ /* Public Typedefs */ /*******************/ -/* Reference types */ -typedef enum H5R_type_t { - H5R_BADTYPE = (-1), /* Invalid Reference Type */ - H5R_OBJECT, /* Object reference */ - H5R_DATASET_REGION, /* Dataset Region Reference */ - H5R_MAXTYPE /* Highest type (Invalid as true type) */ +//! <!-- [H5R_type_t_snip] --> +/** + * 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_OBJECT, /**< Object reference */ + H5R_DATASET_REGION, /**< Dataset Region Reference */ + H5R_MAXTYPE /**< Highest type (Invalid as true type) */ } H5R_type_t; +//! <!-- [H5R_type_t_snip] --> -/* Object reference structure for user's code +//! <!-- [hobj_ref_t_snip] --> +/** + * Object reference structure for user's code * This needs to be large enough to store largest haddr_t on a worst case * machine (8 bytes currently). */ typedef haddr_t hobj_ref_t; +//! <!-- [hobj_ref_t_snip] --> -/* Dataset Region reference structure for user's code +//! <!-- [hdset_reg_ref_t_snip] --> +/** + * Dataset Region reference structure for user's code * (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 */ typedef unsigned char hdset_reg_ref_t[H5R_DSET_REG_REF_BUF_SIZE]; +//! <!-- [hdset_reg_ref_t_snip] --> /********************/ /* Public Variables */ @@ -75,10 +88,223 @@ typedef unsigned char hdset_reg_ref_t[H5R_DSET_REG_REF_BUF_SIZE]; extern "C" { #endif -H5_DLL herr_t H5Rcreate(void *ref, hid_t loc_id, const char *name, H5R_type_t ref_type, hid_t space_id); -H5_DLL hid_t H5Rdereference2(hid_t obj_id, hid_t oapl_id, H5R_type_t ref_type, const void *ref); -H5_DLL hid_t H5Rget_region(hid_t dataset, H5R_type_t ref_type, const void *ref); -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 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 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 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 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 /*out*/, size_t size); @@ -89,8 +315,110 @@ H5_DLL ssize_t H5Rget_name(hid_t loc_id, H5R_type_t ref_type, const void *ref, c #ifndef H5_NO_DEPRECATED_SYMBOLS /* Function prototypes */ -H5_DLL H5G_obj_t H5Rget_obj_type1(hid_t id, H5R_type_t ref_type, const void *_ref); -H5_DLL hid_t H5Rdereference1(hid_t obj_id, H5R_type_t ref_type, const void *ref); +/** + * -------------------------------------------------------------------------- + * \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 */ |