/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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 H5D module. */ #ifndef H5Dpublic_H #define H5Dpublic_H /* System headers needed by this file */ /* Public headers needed by this file */ #include "H5public.h" #include "H5Ipublic.h" /*****************/ /* Public Macros */ /*****************/ /* Macros used to "unset" chunk cache configuration parameters */ #define H5D_CHUNK_CACHE_NSLOTS_DEFAULT ((size_t)-1) #define H5D_CHUNK_CACHE_NBYTES_DEFAULT ((size_t)-1) #define H5D_CHUNK_CACHE_W0_DEFAULT (-1.0) /** * Bit flags for the H5Pset_chunk_opts() and H5Pget_chunk_opts() */ #define H5D_CHUNK_DONT_FILTER_PARTIAL_CHUNKS (0x0002u) /*******************/ /* Public Typedefs */ /*******************/ //! /** * Values for the H5D_LAYOUT property */ typedef enum H5D_layout_t { H5D_LAYOUT_ERROR = -1, /**< error */ H5D_COMPACT = 0, /**< raw data is small (< 64KB) */ H5D_CONTIGUOUS = 1, /**< contiguous layout */ H5D_CHUNKED = 2, /**< chunked or tiled layout */ H5D_VIRTUAL = 3, /**< actual data is stored in other datasets */ H5D_NLAYOUTS = 4 /**< this one must be last! */ } H5D_layout_t; //! //! /** * Types of chunk index data structures */ typedef enum H5D_chunk_index_t { H5D_CHUNK_IDX_BTREE = 0, /**< v1 B-tree index (default) */ H5D_CHUNK_IDX_SINGLE = 1, /**< Single Chunk index (cur dims[]=max dims[]=chunk dims[]; filtered & non-filtered) */ H5D_CHUNK_IDX_NONE = 2, /**< Implicit: No Index (#H5D_ALLOC_TIME_EARLY, non-filtered, fixed dims) */ H5D_CHUNK_IDX_FARRAY = 3, /**< Fixed array (for 0 unlimited dims) */ H5D_CHUNK_IDX_EARRAY = 4, /**< Extensible array (for 1 unlimited dim) */ H5D_CHUNK_IDX_BT2 = 5, /**< v2 B-tree index (for >1 unlimited dims) */ H5D_CHUNK_IDX_NTYPES /**< This one must be last! */ } H5D_chunk_index_t; //! //! /** * Values for the space allocation time property */ typedef enum H5D_alloc_time_t { H5D_ALLOC_TIME_ERROR = -1, /**< Error */ H5D_ALLOC_TIME_DEFAULT = 0, /**< Default (layout dependent) */ H5D_ALLOC_TIME_EARLY = 1, /**< Allocate on creation */ H5D_ALLOC_TIME_LATE = 2, /**< Allocate on first write */ H5D_ALLOC_TIME_INCR = 3 /**< Allocate incrementally (by chunk) */ } H5D_alloc_time_t; //! //! /** * Values for the status of space allocation */ typedef enum H5D_space_status_t { H5D_SPACE_STATUS_ERROR = -1, /**< Error */ H5D_SPACE_STATUS_NOT_ALLOCATED = 0, /**< Space has not been allocated for this dataset. */ H5D_SPACE_STATUS_PART_ALLOCATED = 1, /**< Space has been partially allocated for this dataset. (Used only for datasets with chunked storage.) */ H5D_SPACE_STATUS_ALLOCATED = 2 /**< Space has been allocated for this dataset. */ } H5D_space_status_t; //! //! /** * Values for time of writing fill value property */ typedef enum H5D_fill_time_t { H5D_FILL_TIME_ERROR = -1, /**< Error */ H5D_FILL_TIME_ALLOC = 0, /**< Fill on allocation */ H5D_FILL_TIME_NEVER = 1, /**< Never write fill values */ H5D_FILL_TIME_IFSET = 2 /**< Fill if fill-value was set */ } H5D_fill_time_t; //! //! /** * Values for fill value status */ typedef enum H5D_fill_value_t { H5D_FILL_VALUE_ERROR = -1, /**< Error */ H5D_FILL_VALUE_UNDEFINED = 0, /**< No fill value defined */ H5D_FILL_VALUE_DEFAULT = 1, /**< Default fill-value */ H5D_FILL_VALUE_USER_DEFINED = 2 /**< User-defined fill-value */ } H5D_fill_value_t; //! //! /** * Values for VDS bounds option */ typedef enum H5D_vds_view_t { H5D_VDS_ERROR = -1, /**< Error */ H5D_VDS_FIRST_MISSING = 0, /**< Include all data before the first missing mapped data */ H5D_VDS_LAST_AVAILABLE = 1 /**< Include all available mapped data */ } H5D_vds_view_t; //! //! /** * \brief Callback for H5Pset_append_flush() * * \dset_id{dataset_id} * \param[in] cur_dims The current extent of the dataset's dimensions * \param[in,out] op_data User context * * \return \herr_t * */ typedef herr_t (*H5D_append_cb_t)(hid_t dataset_id, hsize_t *cur_dims, void *op_data); //! //! /** * \brief Callback for H5Diterate() * * \param[in,out] elem Pointer to the memory buffer containing the current dataset * element * \param[in] type_id Datatype identifier of the elements stored in \p elem * \param[in] ndim Number of dimensions for the \p point array * \param[in] point Array containing the location of the element within * the original dataspace * \param[in,out] operator_data Pointer to any user-defined data associated with * the operation * \return \herr_t_iter * */ typedef herr_t (*H5D_operator_t)(void *elem, hid_t type_id, unsigned ndim, const hsize_t *point, void *operator_data); //! //! /** * \brief Callback for H5Dscatter() * * \param[out] src_buf Pointer to the buffer holding the next set of elements to * scatter. On entry, the value of where \p src_buf points to * is undefined. The callback function should set \p src_buf * to point to the next set of elements. * \param[out] src_buf_bytes_used Pointer to the number of valid bytes in \p src_buf. * On entry, the value where \p src_buf_bytes_used points * to is undefined. The callback function should set * \p src_buf_bytes_used to the of valid bytes in \p src_buf. * This number must be a multiple of the datatype size. * \param[in,out] op_data User-defined pointer to data required by the callback * function. A pass-through of the \p op_data pointer provided * with the H5Dscatter() function call. * \return herr_t * * \details The callback function should always return at least one * element in \p src_buf, and must not return more elements * than are remaining to be scattered. This function will be * repeatedly called until all elements to be scattered have * been returned. The callback function should return zero (0) * to indicate success, and a negative value to indicate failure. * */ typedef herr_t (*H5D_scatter_func_t)(const void **src_buf /*out*/, size_t *src_buf_bytes_used /*out*/, void *op_data); //! //! /** * \brief Callback for H5Dgather() * * \param[in] dst_buf Pointer to the destination buffer which has been filled * with the next set of elements gathered. This will always * be identical to the \p dst_buf passed to H5Dgather() * \param[in] dst_buf_bytes_used Pointer to the number of valid bytes in * \p dst_buf. This number must be a multiple of * the datatype size. * \param[in,out] op_data User-defined pointer to data required by the callback * function; a pass-through of the \p op_data pointer * provided with the H5Dgather() function call. * \returns \herr_t * * \details The callback function should process, store, or otherwise make use * of the data returned in dst_buf before it returns, because the * buffer will be overwritten unless it is the last call to the * callback. This function will be repeatedly called until all gathered * elements have been passed to the callback in dst_buf. The callback * function should return zero (0) to indicate success, and a negative * value to indicate failure. * */ typedef herr_t (*H5D_gather_func_t)(const void *dst_buf, size_t dst_buf_bytes_used, void *op_data); //! //! /** * \brief Callback for H5Dchunk_iter() * * \param[in] offset Logical position of the chunk’s first element in units of dataset elements * \param[in] filter_mask Bitmask indicating the filters used when the chunk was written * \param[in] addr Chunk address in the file * \param[in] size Chunk size in bytes, 0 if the chunk does not exist * \param[in,out] op_data Pointer to any user-defined data associated with * the operation. * \returns \li Zero (#H5_ITER_CONT) causes the iterator to continue, returning * zero when all elements have been processed. * \li A positive value (#H5_ITER_STOP) causes the iterator to * immediately return that value, indicating short-circuit success. * \li A negative (#H5_ITER_ERROR) causes the iterator to immediately * return that value, indicating failure. */ typedef int (*H5D_chunk_iter_op_t)(const hsize_t *offset, unsigned filter_mask, haddr_t addr, hsize_t size, void *op_data); //! /********************/ /* Public Variables */ /********************/ /*********************/ /* Public Prototypes */ /*********************/ #ifdef __cplusplus extern "C" { #endif /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Creates a new dataset and links it into the file * * \fgdta_loc_id * \param[in] name Name of the dataset to create * \type_id * \space_id * \lcpl_id * \dcpl_id * \dapl_id * * \return \hid_t{dataset} * * \details H5Dcreate2() creates a new dataset named \p name at * the location specified by \p loc_id, and associates constant * and initial persistent properties with that dataset, including * the datatype \p dtype_id, the dataspace \p space_id, and * other properties as specified by the dataset creation property * list \p dcpl_id and the access property list \p dapl_id, * respectively. Once created, the dataset is opened for access. * * \p loc_id may specify a file, group, dataset, named datatype, * or attribute. If an attribute, dataset, or named datatype is * specified, then the dataset will be created at the location * where the attribute, dataset, or named datatype is attached. * * \p name may be either an absolute path in the file or a relative * path from \p loc_id naming the dataset. * * If \p dtype_id is a committed datatype, and if the file location * associated with the committed datatype is different from the * file location where the dataset will be created, the datatype * is copied and converted to a transient type. * * The link creation property list, \p lcpl_id, governs the creation * of the link(s) by which the new dataset is accessed and the * creation of any intermediate groups that may be missing. * * The datatype and dataspace properties and the dataset creation * and access property lists are attached to the dataset, so the * caller may derive new datatypes, dataspaces, and creation and * access properties from the old ones and reuse them in calls to * create additional datasets. Once created, the dataset can be * read from or written to. Reading data from a dataset that was * not previously written, the HDF5 library will return default * or user-defined fill values. * * \par Example * \snippet H5D_examples.c create * * \since 1.8.0 * * \see H5Dopen2(), H5Dclose(), H5Tset_size() * */ H5_DLL hid_t H5Dcreate2(hid_t loc_id, const char *name, hid_t type_id, hid_t space_id, hid_t lcpl_id, hid_t dcpl_id, hid_t dapl_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Creates a dataset in a file without linking it into the file * structure * * \fgdta_loc_id * \type_id * \space_id * \dcpl_id * \dapl_id * * \return \hid_t{dataset} * * \details H5Dcreate_anon() creates a dataset in the file specified * by \p loc_id. * * \p loc_id may specify a file, group, dataset, named datatype, * or attribute. If an attribute, dataset, or named datatype is * specified, then the dataset will be created at the location * where the attribute, dataset, or named datatype is attached. * * The dataset’s datatype and dataspace are specified by * \p type_id and \p space_id, respectively. These are the * datatype and dataspace of the dataset as they will exist in * the file, which may differ from the datatype and dataspace * in application memory. * * H5Dcreate_anon() returns a new dataset identifier. Using * this identifier, the new dataset must be linked into the * HDF5 file structure with H5Olink() or it will be deleted * when the file is closed. * * \since 1.8.0 * * \see H5Olink(), H5Dcreate() * */ H5_DLL hid_t H5Dcreate_anon(hid_t loc_id, hid_t type_id, hid_t space_id, hid_t dcpl_id, hid_t dapl_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Opens an existing dataset * * \fgdta_loc_id * \param[in] name Name of the dataset to open * \dapl_id * * \return \hid_t{dataset} * * \details H5Dopen2() opens the existing dataset specified * by a location identifier and name, \p loc_id and \p name, * respectively. * * \p loc_id may specify a file, group, dataset, named datatype, * or attribute. If an attribute, dataset, or named datatype is * specified then the dataset will be opened at the location * where the attribute, dataset, or named datatype is attached. * * \since 1.8.0 * * \see H5Dcreate2(), H5Dclose() * */ H5_DLL hid_t H5Dopen2(hid_t loc_id, const char *name, hid_t dapl_id); /** * -------------------------------------------------------------------------- *\ingroup H5D * * \brief Returns an identifier for a copy of the dataspace for a dataset * * \dset_id * * \return \hid_t{dataspace} * * \details H5Dget_space() makes a copy of the dataspace of * the dataset specified by \p dset_id. The function returns an * identifier for the new copy of the dataspace. * * A dataspace identifier returned from this function should * be released with H5Sclose() when the identifier is no longer * needed so that resource leaks will not occur. * * \par Example * \snippet H5D_examples.c update * * \see H5Sclose() * */ H5_DLL hid_t H5Dget_space(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Determines whether space has been allocated for a dataset * * \dset_id * \param[out] allocation Space allocation status * * \return \herr_t * * \details H5Dget_space_status() determines whether space has been allocated * for the dataset \p dset_id. * * \note \Bold{BUG:} Prior to the HDF5 1.14.0, 1.12.2 and 1.10.9 releases, * H5Dget_space_status() may return incorrect space allocation status * values for datasets with filters applied to them. * H5Dget_space_status() calculated the space allocation status by * comparing the sum of the sizes of all the allocated chunks in the * dataset against the total data size of the dataset, as calculated by * the number of elements in the dataset's dataspace multiplied by the * dataset's datatype size. If the dataset had any compression filters * applied to it and the dataset chunks were successfully compressed, * the sum of the sizes of the allocated dataset chunks would generally * always be less than the total data size of the dataset, and * H5Dget_space_status() wouldn't ever return * `H5D_SPACE_STATUS_ALLOCATED`. * * \since 1.6.0 * */ H5_DLL herr_t H5Dget_space_status(hid_t dset_id, H5D_space_status_t *allocation); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Returns an identifier for a copy of the datatype for a dataset * * \dset_id * * \return \hid_t{datatype} * * \details H5Dget_type() returns an identifier of a copy of * the datatype for a dataset. * * If a dataset has a named datatype, then an identifier to the * opened datatype is returned. Otherwise, the returned datatype * is read-only. * */ H5_DLL hid_t H5Dget_type(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Returns an identifier for a copy of the dataset creation * property list for a dataset * * \dset_id * * \return \hid_t{dataset creation property list} * * \details H5Dget_create_plist() returns an identifier for * a copy of the dataset creation property list associated with * the dataset specified by \p dset_id. * * The creation property list identifier should be released with * H5Pclose() to prevent resource leaks. * */ H5_DLL hid_t H5Dget_create_plist(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Returns the dataset access property list associated with * a dataset * * \dset_id * * \return \hid_t{dataset access property list} * * \details H5Dget_access_plist() returns a copy of the * dataset access property list used to open the specified * dataset, \p dset_id. Modifications to the returned property * list will have no effect on the dataset it was retrieved from. * * The chunk cache parameters in the returned property lists will * be those used by the dataset. If the properties in the file * access property list were used to determine the dataset's * chunk cache configuration, then those properties will be * present in the returned dataset access property list. If * the dataset does not use a chunked layout, then the chunk * cache properties will be set to the default. The chunk cache * properties in the returned list are considered to be “set”, * and any use of this list will override the corresponding * properties in the file’s file access property list. * * All link access properties in the returned list will be set * to the default values. * * \since 1.8.3 * */ H5_DLL hid_t H5Dget_access_plist(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Returns the amount of storage allocated for a dataset * * \dset_id * * \return Returns the amount of storage space, in bytes, or 0 (zero). * * \details H5Dget_storage_size() returns the amount of storage, * in bytes, that is allocated in the file for the raw data of * the dataset specified by \p dset_id. * H5Dget_storage_size() reports only the space required to store * the dataset elements, excluding any metadata. * \li For contiguous datasets, the returned size equals the current * allocated size of the raw data. * \li For unfiltered chunked datasets, the returned size is the * number of allocated chunks times the chunk size. * \li For filtered chunked datasets, the returned size is the * space required to store the filtered data. For example, if a * compression filter is in use, H5Dget_storage_size() will return * the total space required to store the compressed chunks. * * \note Note that H5Dget_storage_size() is not generally an * appropriate function to use when determining the amount * of memory required to work with a dataset. In such * circumstances, you must determine the number of data * points in a dataset and the size of an individual dataset * element. H5Sget_simple_extent_npoints() and H5Tget_size() * can be used to calculate that amount. * * \warning H5Dget_storage_size() does not differentiate between 0 (zero), * the value returned for the storage size of a dataset * with no stored values, and 0 (zero), the value returned to * indicate an error. * * */ H5_DLL hsize_t H5Dget_storage_size(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Returns the amount of storage allocated within the file for a * raw data chunk in a dataset * * \dset_id * \param[in] offset Logical offset in the dataset for the chunk to query * \param[out] chunk_bytes The size in bytes for the chunk * * \return \herr_t * * \details H5Dget_chunk_storage_size() returns the size in bytes * allocated in the file for a raw data chunk as specified by * its logical \p offset in the dataset \p dset_id. The size is * returned in \p chunk_nbytes. It is the size of the compressed * data if the chunk is filtered and the size may be zero if no * storage is allocated yet for the dataset. * * \since 1.10.2 * */ H5_DLL herr_t H5Dget_chunk_storage_size(hid_t dset_id, const hsize_t *offset, hsize_t *chunk_bytes); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Retrieves number of chunks that have nonempty intersection with a * specified selection * * \dset_id * \param[in] fspace_id File dataspace selection identifier * \param[out] nchunks Number of chunks in the selection * * \return \herr_t * * \details H5Dget_num_chunks() retrieves the number of chunks * nchunks in a set of selected elements specified by \p fspace_id * for a dataset specified by the identifier \p dset_id. If \p * fspace_id is #H5S_ALL, the function will retrieve the total * number of chunks stored for the dataset. * * \p fspace_id specifies the file dataspace selection. It is * intended to take #H5S_ALL for specifying the current selection. * * \note Please be aware that this function currently does not * support non-trivial selections, thus \p fspace_id has no * effect. Also, the implementation does not handle the #H5S_ALL * macro correctly. As a workaround, application can get * the dataspace for the dataset using H5Dget_space() and pass that * in for \p fspace_id. This will be fixed in a future release. * * \since 1.10.5 * */ H5_DLL herr_t H5Dget_num_chunks(hid_t dset_id, hid_t fspace_id, hsize_t *nchunks); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Retrieves information about a chunk specified by its coordinates * * \dset_id * \param[in] offset Logical position of the chunk’s first element in units of dataset elements * \param[out] filter_mask Bitmask indicating the filters used when the chunk was written * \param[out] addr Chunk address in the file * \param[out] size Chunk size in bytes, 0 if the chunk does not exist * * \return \herr_t * * \details H5Dget_chunk_info_by_coord() retrieves the \p filter_mask, \p size, * and \p addr for a chunk in the dataset specified by \p dset_id, * using the coordinates specified by \p offset. * * If the queried chunk does not exist in the file, \p size will * be set to 0, \p addr to \c HADDR_UNDEF, and the buffer \p * filter_mask will not be modified. * * \p offset is a pointer to a one-dimensional array with a size * equal to the dataset’s rank. Each element is the logical * position of the chunk’s first element in a dimension. * * \since 1.10.5 * */ H5_DLL herr_t H5Dget_chunk_info_by_coord(hid_t dset_id, const hsize_t *offset, unsigned *filter_mask, haddr_t *addr, hsize_t *size); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Iterate over all chunks of a chunked dataset * * \dset_id * \param[in] dxpl_id Identifier of a transfer property list * \param[in] cb User callback function, called for every chunk. * \param[in] op_data User-defined pointer to data required by op * * \return \herr_t * * \details H5Dchunk_iter iterates over all chunks in the dataset, calling the * user supplied callback with the details of the chunk and the supplied * context \p op_data. * * \par Example * For each chunk, print the allocated chunk size (0 for unallocated chunks). * \snippet H5D_examples.c H5Dchunk_iter_cb * Iterate over all chunked datasets and chunks in a file. * \snippet H5D_examples.c H5Ovisit_cb * * \since 1.12.3 * */ H5_DLL herr_t H5Dchunk_iter(hid_t dset_id, hid_t dxpl_id, H5D_chunk_iter_op_t cb, void *op_data); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Retrieves information about a chunk specified by its index * * \dset_id * \param[in] fspace_id File dataspace selection identifier (See Note below) * \param[in] chk_idx Index of the chunk * \param[out] offset Logical position of the chunk’s first element in units of dataset elements * \param[out] filter_mask Bitmask indicating the filters used when the chunk was written * \param[out] addr Chunk address in the file * \param[out] size Chunk size in bytes, 0 if the chunk does not exist * * \return \herr_t * * \details H5Dget_chunk_info() retrieves the offset coordinates, * \p offset, filter mask, \p filter_mask, size, \p size, and address * \p addr for the dataset specified by the identifier \p dset_id and the chunk * specified by the index \p index. The chunk belongs to a set of * chunks in the selection specified by \p fspace_id. If the queried * chunk does not exist in the file, the size will be set to 0 and * address to HADDR_UNDEF. The value pointed to by filter_mask will * not be modified. \c NULL can be passed in for any \p out parameters. * * \p chk_idx is the chunk index in the selection. The index value * may have a value of 0 up to the number of chunks stored in * the file that has a nonempty intersection with the file * dataspace selection. * * \note As of 1.10.5, the dataspace intersection is not yet * supported. Hence, the index is of all the written chunks. * * \p fspace_id specifies the file dataspace selection. It is * intended to take #H5S_ALL to specify the current selection. * * \note Please be aware that this function currently does not * support non-trivial selections; thus \p fspace_id has no * effect. Also, the implementation does not handle the #H5S_ALL * macro correctly. As a workaround, an application can get * the dataspace for the dataset using H5Dget_space() and pass that * in for \p fspace_id. This will be fixed in a future release. * * \since 1.10.5 * */ H5_DLL herr_t H5Dget_chunk_info(hid_t dset_id, hid_t fspace_id, hsize_t chk_idx, hsize_t *offset, unsigned *filter_mask, haddr_t *addr, hsize_t *size); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Returns dataset address in file * * \dset_id * * \return Returns the offset in bytes; otherwise, returns HADDR_UNDEF, * a negative value. * * \details H5Dget_offset() returns the address in the file of * the dataset, \p dset_id. That address is expressed as the * offset in bytes from the beginning of the file. * * \since 1.6.0 * */ H5_DLL haddr_t H5Dget_offset(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Reads raw data from a dataset into a provided buffer * * \dset_id Identifier of the dataset to read from * \param[in] mem_type_id Identifier of the memory datatype * \param[in] mem_space_id Identifier of the memory dataspace * \param[in] file_space_id Identifier of the dataset's dataspace in the file * \param[in] dxpl_id Identifier of a transfer property list * \param[out] buf Buffer to receive data read from file * * \return \herr_t * * \details H5Dread() reads a dataset, specified by its identifier * \p dset_id, from the file into an application memory buffer \p * buf. Data transfer properties are defined by the argument \p * dxpl_id. The memory datatype of the (partial) dataset * is identified by the identifier \p mem_type_id. The part * of the dataset to read is defined by \p mem_space_id and \p * file_space_id. * * \p file_space_id is used to specify only the selection within * the file dataset's dataspace. Any dataspace specified in \p * file_space_id is ignored by the library and the dataset's * dataspace is always used. \p file_space_id can be the constant * #H5S_ALL, which indicates that the entire file dataspace, * as defined by the current dimensions of the dataset, is to * be selected. * * \p mem_space_id is used to specify both the memory dataspace * and the selection within that dataspace. \p mem_space_id can * be the constant #H5S_ALL, in which case the file dataspace is * used for the memory dataspace and the selection defined with \p * file_space_id is used for the selection within that dataspace. * * The number of elements selected in the memory dataspace \Emph{must} * be equal to the number of elements selected in the file dataspace. * * The behavior of the library for the various combinations of * valid dataspace identifiers and #H5S_ALL for the \p mem_space_id * and the \p file_space_id parameters is described below: * * * * * * * * * * * * * * * * * * * * * * * * * * * *
mem_space_idfile_space_idBehavior
valid dataspace IDvalid dataspace ID\p mem_space_id specifies the memory dataspace and the * selection within it. \p file_space_id specifies the * selection within the file dataset's dataspace.
#H5S_ALLvalid dataspace IDThe file dataset's dataspace is used for the memory * dataspace and the selection specified with \p file_space_id * specifies the selection within it. The combination of the * file dataset's dataspace and the selection from * \p file_space_id is used for memory also.
valid dataspace ID#H5S_ALL\p mem_space_id specifies the memory dataspace and the * selection within it. The selection within the file * dataset's dataspace is set to the "all" selection.
#H5S_ALL#H5S_ALLThe file dataset's dataspace is used for the memory * dataspace and the selection within the memory dataspace * is set to the "all" selection. The selection within the * file dataset's dataspace is set to the "all" selection.
* * \note If no storage space was allocated for the dataset * and a fill value is defined, the returned buffer \p buf * is filled with the fill value. * * \par Example * \snippet H5D_examples.c read * */ H5_DLL herr_t H5Dread(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t dxpl_id, void *buf /*out*/); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Writes raw data from a buffer to a dataset * * \param[in] dset_id Identifier of the dataset to read from * \param[in] mem_type_id Identifier of the memory datatype * \param[in] mem_space_id Identifier of the memory dataspace * \param[in] file_space_id Identifier of the dataset's dataspace in the file * \dxpl_id * \param[out] buf Buffer with data to be written to the file * * \return \herr_t * * \details H5Dwrite() writes a (partial) dataset, specified by * its identifier \p dset_id, from the application memory buffer \p * buf into the file. Data transfer properties are defined by the * argument \p dxpl_id. The memory datatype of the (partial) * dataset is identified by the identifier \p mem_type_id. The * part of the dataset to write is defined by \p mem_space_id * and \p file_space_id. * * If \p mem_type_id is either a fixed-length or variable-length * string, it is important to set the string length when defining * the datatype. String datatypes are derived from #H5T_C_S1 * (or #H5T_FORTRAN_S1 for Fortran codes), which defaults * to 1 character in size. See H5Tset_size() and Creating * variable-length string datatypes. * * \p file_space_id is used to specify only the selection within * the file dataset's dataspace. Any dataspace specified in \p * file_space_id is ignored by the library and the dataset's * dataspace is always used. \p file_space_id can be the constant * #H5S_ALL, which indicates that the entire file dataspace, * as defined by the current dimensions of the dataset, is to * be selected. * * \p mem_space_id is used to specify both the memory dataspace * and the selection within that dataspace. mem_space_id can be * the constant #H5S_ALL, in which case the file dataspace is * used for the memory dataspace and the selection defined with \p * file_space_id is used for the selection within that dataspace. * * The behavior of the library for the various combinations of * valid dataspace IDs and #H5S_ALL for the mem_space_id and * thefile_space_id parameters is described below: * * * * * * * * * * * * * * * * * *
\c mem_space_id\c file_space_idBehavior
valid dataspace IDvalid dataspace ID\p mem_space_id specifies the memory dataspace and the * selection within it. \p file_space_id specifies the * selection within the file dataset's dataspace.
#H5S_ALLvalid dataspace IDThe file dataset's dataspace is used for the memory * dataspace and the selection specified with \p file_space_id * specifies the selection within it. The combination of the * file dataset's dataspace and the selection from \p * file_space_id is used for memory also. valid dataspace * ID
valid dataspace ID#H5S_ALL\p mem_space_id specifies the memory dataspace and the * selection within it. The selection within the file * dataset's dataspace is set to "all" selection.
#H5S_ALL#H5S_ALLThe file dataset's dataspace is used for the memory * dataspace and the selection within the memory dataspace is * set to the "all" selection. The selection within the file * dataset's dataspace is set to the "all" * selection.
* Setting an "all" selection indicates that the entire dataspace, * as defined by the current dimensions of a dataspace, will * be selected. The number of elements selected in the memory * dataspace must match the number of elements selected in the * file dataspace. * * \p dxpl_id can be the constant #H5P_DEFAULT, in which * case the default data transfer properties are used. * * Writing to a dataset will fail if the HDF5 file was not opened * with write access permissions. * * If the dataset's space allocation time is set to * #H5D_ALLOC_TIME_LATE or #H5D_ALLOC_TIME_INCR and the space for * the dataset has not yet been allocated, that space is allocated * when the first raw data is written to the dataset. Unused space * in the dataset will be written with fill values at the same * time if the dataset's fill time is set to #H5D_FILL_TIME_IFSET * or #H5D_FILL_TIME_ALLOC. * * \par_compr_note * * \attention If a dataset's storage layout is 'compact', care must be * taken when writing data to the dataset in parallel. A compact * dataset's raw data is cached in memory and may be flushed * to the file from any of the parallel processes, so parallel * applications should always attempt to write identical data to * the dataset from all processes. * * \par Example * \snippet H5D_examples.c update * * \see H5Pset_fill_time(), H5Pset_alloc_time() * */ H5_DLL herr_t H5Dwrite(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t dxpl_id, const void *buf); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Writes a raw data chunk from a buffer directly to a dataset in a file * * \dset_id * \dxpl_id * \param[in] filters Mask for identifying the filters in use * \param[in] offset Logical position of the chunk’s first element in the * dataspace * \param[in] data_size Size of the actual data to be written in bytes * \param[in] buf Buffer containing data to be written to the chunk * * \return \herr_t * * \details H5Dwrite_chunk() writes a raw data chunk as specified * by its logical offset \p offset in a chunked dataset \p dset_id * from the application memory buffer \p buf to the dataset in * the file. Typically, the data in \p buf is preprocessed in * memory by a custom transformation, such as compression. The * chunk will bypass the library’s internal data transfer * pipeline, including filters, and will be written directly to * the file. Only one chunk can be written with this function. * * \p filters is a mask providing a record of which filters are * used with the chunk. The default value of the mask is * zero (0), indicating that all enabled filters are applied. A * filter is skipped if the bit corresponding to the filter’s * position in the pipeline (0 ≤ position < 32) is turned on. * This mask is saved with the chunk in the file. * * \p offset is an array specifying the logical position of the * first element of the chunk in the dataset’s dataspace. The * length of the offset array must equal the number of dimensions, * or rank, of the dataspace. The values in offset must not exceed * the dimension limits and must specify a point that falls on * a dataset chunk boundary. * * \p data_size is the size in bytes of the chunk, representing * the number of bytes to be read from the buffer \p buf. If the * data chunk has been precompressed, \p data_size should be the * size of the compressed data. * * \p buf is the memory buffer containing data to be written to * the chunk in the file. * * \attention Exercise caution when using H5Dread_chunk() and * H5Dwrite_chunk(), as they read and write data chunks directly * in a file. H5Dwrite_chunk() bypasses hyperslab selection, the * conversion of data from one datatype to another, and the filter * pipeline to write the chunk. Developers should have experience * with these processes before using this function. * * \note H5Dread_chunk() and H5Dwrite_chunk() are currently not supported * with parallel HDF5 and do not support variable-length types. * * \since 1.10.2 * */ H5_DLL herr_t H5Dwrite_chunk(hid_t dset_id, hid_t dxpl_id, uint32_t filters, const hsize_t *offset, size_t data_size, const void *buf); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Reads a raw data chunk directly from a dataset in a file into * a buffer * * \dset_id * \dxpl_id * \param[in] offset Logical position of the chunk’s first element in the * dataspace * \param[in,out] filters Mask for identifying the filters in use * \param[out] buf Buffer containing data to be written to the chunk * * \return \herr_t * * \details H5Dread_chunk() reads a raw data chunk as specified by * its logical offset \p offset in a chunked dataset \p dset_id * from the dataset in the file into the application memory * buffer \p buf. The data in \p buf is read directly from the * file bypassing the library’s internal data transfer pipeline, * including filters. * * \p offset is an array specifying the logical position of the * first element of the chunk in the dataset’s dataspace. The * length of the \p offset array must equal the number of dimensions, * or rank, of the dataspace. The values in \p offset must not exceed * the dimension limits and must specify a point that falls on * a dataset chunk boundary. * * The mask \p filters indicates which filters were used when the * chunk was written. A zero value (all bits 0) indicates that all * enabled filters are applied on the chunk. A filter is skipped if * the bit corresponding to the filter’s position in the pipeline * (0 ≤ position < 32) is turned on. * * \p buf is the memory buffer containing the chunk read from * the dataset in the file. * * \attention Exercise caution when using H5Dread_chunk() and * H5Dwrite_chunk(), as they read and write data chunks directly * in a file. H5Dwrite_chunk() bypasses hyperslab selection, the * conversion of data from one datatype to another, and the filter * pipeline to write the chunk. Developers should have experience * with these processes before using this function. Please see * Using the Direct Chunk Write Function for more information. * * \note H5Dread_chunk() and H5Dwrite_chunk() are currently not supported * with parallel HDF5 and do not support variable-length datatypes. * * \since 1.10.2 * */ H5_DLL herr_t H5Dread_chunk(hid_t dset_id, hid_t dxpl_id, const hsize_t *offset, uint32_t *filters, void *buf); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Iterates over all selected elements in a dataspace * * \param[in,out] buf Buffer containing the elements to iterate over * \type_id * \space_id * \param[in] op Function pointer * \param[in,out] operator_data User-defined data * * \return \success{The return value of the first operator that returns * non-zero, or zero if all members were processed with no * operator returning non-zero.} * \return \failure{Negative if an error occurs in the library, or the negative * value returned by one of the operators.} * * \details H5Diterate() iterates over all the data elements * in the memory buffer \p buf, executing the callback function * \p op once for each such data element. * * \attention Unlike other HDF5 iterators, this iteration operation cannot * be restarted at the point of exit; a second H5Diterate() * call will always restart at the beginning. * * \warning Modifying the selection of \p space_id during iteration * will lead to undefined behavior. * * \since 1.10.2 * */ H5_DLL herr_t H5Diterate(void *buf, hid_t type_id, hid_t space_id, H5D_operator_t op, void *operator_data); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Determines the number of bytes required to store variable-length * (VL) data * * \dset_id * \type_id * \space_id * \param[out] size Size in bytes of the memory buffer required to store * the VL data * * \return \herr_t * * \details H5Dvlen_get_buf_size() determines the number of bytes * required to store the VL data from the dataset, using \p * space_id for the selection in the dataset on disk and the \p * type_id for the memory representation of the VL data in memory. * \p size is returned with the number of bytes required to store * the VL data in memory. * * \since 1.10.2 * */ H5_DLL herr_t H5Dvlen_get_buf_size(hid_t dset_id, hid_t type_id, hid_t space_id, hsize_t *size); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Fills dataspace elements with a fill value in a memory buffer * * \param[in] fill Pointer to the fill value to be used * \param[in] fill_type_id Fill value datatype identifier * \param[in,out] buf Pointer to the memory buffer containing the * selection to be filled * \param[in] buf_type_id Datatype of dataspace elements to be filled * \space_id * * \return \herr_t * * \details H5Dfill() fills the dataspace selection, \p space_id, in memory * with the fill value specified in \p fill. If \p fill is NULL, * a fill value of 0 (zero) is used. * * \p fill_type_id specifies the datatype of the fill value. * \p buf specifies the buffer in which the fill elements * will be written. \p buf_type_id specifies the datatype of * those data elements. * * \note Note that if the fill value datatype differs from the memory * buffer datatype, the fill value will be converted to the memory * buffer datatype before filling the selection. * * \note Applications sometimes write data only to portions of an * allocated dataset. It is often useful in such cases to fill * the unused space with a known fill value. * * \see H5Pset_fill_value(), H5Pget_fill_value(), H5Pfill_value_defined(), * H5Pset_fill_time(), H5Pget_fill_time(), H5Pcreate(), H5Dcreate_anon() * */ H5_DLL herr_t H5Dfill(const void *fill, hid_t fill_type_id, void *buf, hid_t buf_type_id, hid_t space_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Changes the sizes of a dataset’s dimensions * * \dset_id * \param[in] size[] Array containing the new magnitude of each dimension * of the dataset * * \return \herr_t * * \details H5Dset_extent() sets the current dimensions of the * chunked dataset \p dset_id to the sizes specified in size. * * \p size is a 1-dimensional array with n elements, where \p n is * the rank of the dataset’s current dataspace. * * This function can be applied to the following datasets: * - A chunked dataset with unlimited dimensions * - A chunked dataset with fixed dimensions if the new dimension * sizes are less than the maximum sizes set with maxdims (see * H5Screate_simple()) * - An external dataset with unlimited dimensions * - An external dataset with fixed dimensions if the new dimension * sizes are less than the maximum sizes set with \p maxdims * * Note that external datasets are always contiguous and can be * extended only along the first dimension. * * Space on disk is immediately allocated for the new dataset extent if * the dataset’s space allocation time is set to #H5D_ALLOC_TIME_EARLY. * * Fill values will be written to the dataset in either of the * following situations, but not otherwise: * * - If the dataset’s fill time is set to #H5D_FILL_TIME_IFSET and a * fill value is defined (see H5Pset_fill_time() and * H5Pset_fill_value()) * - If the dataset’s fill time is set to #H5D_FILL_TIME_ALLOC * (see H5Pset_alloc_time()) * * \note If the sizes specified in \p size array are smaller than the dataset’s * current dimension sizes, H5Dset_extent() will reduce the dataset’s * dimension sizes to the specified values. It is the user application’s * responsibility to ensure that valuable data is not lost as * H5Dset_extent() does not check. * * \note Except for external datasets, H5Dset_extent() is for use with * chunked datasets only, not contiguous datasets. * * \note A call to H5Dset_extent() affects the dataspace of a dataset. If a * dataspace handle was opened for a dataset prior to a call to * H5Dset_extent() then that dataspace handle will no longer reflect the * correct dataspace extent of the dataset. H5Dget_space() must be called * (after closing the previous handle) to obtain the current dataspace * extent. * * \since 1.8.0 * */ H5_DLL herr_t H5Dset_extent(hid_t dset_id, const hsize_t size[]); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Flushes all buffers associated with a dataset to disk * * \dset_id * * \return \herr_t * * \details H5Dflush() causes all buffers associated with a * dataset to be immediately flushed to disk without removing * the data from the cache. * * \note HDF5 does not possess full control over buffering. * H5Dflush() flushes the internal HDF5 buffers and then asks the * operating system (the OS) to flush the system buffers for the * open files. After that, the OS is responsible for ensuring * that the data is actually flushed to disk. * * \since 1.10.0 * */ H5_DLL herr_t H5Dflush(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Refreshes all buffers associated with a dataset * * \dset_id * * \return \herr_t * * \details H5Drefresh() causes all buffers associated with a * dataset to be cleared and immediately re-loaded with updated * contents from disk. * * This function essentially closes the dataset, evicts all * metadata associated with it from the cache, and then re-opens * the dataset. The reopened dataset is automatically re-registered * with the same identifier. * * \since 1.10.2 * */ H5_DLL herr_t H5Drefresh(hid_t dset_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Scatters data into a selection within a memory buffer * * \param[in] op Callback function which provides data to be scattered * \param[in] op_data User-defined pointer to data required by op * \param[in] type_id Identifier for the datatype describing the data in * both the source and destination buffers * \param[in] dst_space_id Identifier for the dataspace for destination * \param[out] dst_buf Destination buffer which the data will be scattered to * * \return \herr_t * * \details H5Dscatter() retrieves data from the supplied callback * \p op and scatters it to the supplied buffer \p dst_buf in a * manner similar to data being written to a dataset. * * \p dst_space_id is a dataspace that defines the extent of \p * dst_buf and the selection within it to scatter the data to. * * \p type_id is the datatype of the data to be scattered in both * the source and destination buffers. * * \p dst_buf must be at least as large as the number of elements * in the extent of \p dst_space_id times the size in bytes of * \p type_id. * * To retrieve the data to be scattered, H5Dscatter() repeatedly * calls \p op, which should return a valid source buffer, until * enough data to fill the selection has been retrieved. * * \since 1.10.2 * */ H5_DLL herr_t H5Dscatter(H5D_scatter_func_t op, void *op_data, hid_t type_id, hid_t dst_space_id, void *dst_buf); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Gathers data from a selection within a memory buffer * raw data chunk in a dataset * * \param[in] src_space_id Dataspace identifier for the source buffer * \param[in] src_buf Source buffer which the data will be gathered from * \param[in] type_id Datatype identifier for the source * \param[in] dst_buf_size Size in bytes of \p dst_buf * \param[out] dst_buf Destination buffer for the gathered data * \param[in] op Callback function which handles the gathered data * \param[in] op_data User-defined pointer to data required by \p op * * \return \herr_t * * \details H5Dgather() retrieves data from a selection within the supplied * buffer src_buf and passes it to the supplied callback function * \p op in a contiguous form. * * The dataspace \p src_space_id describes both the dimensions of * the source buffer and the selection within the source buffer * to gather data from. * * \p src_buf must be at least the size of the gathered data, that * is, the number of elements in the extent of \p src_space_id * times the size in bytes of \p type_id. * * The datatype \p type_id describes the data in both the source * and destination buffers. This information is used to calculate * the element size. * * The data is gathered into \p dst_buf, which needs to be large * enough to hold all the data if the callback function \p op is * not provided. * * \p op is a callback function that handles the gathered data. * It is optional if \p dst_buf is large enough to hold all of the * gathered data; required otherwise. * * If no callback function is provided, H5Dgather() simply gathers * the data into \p dst_buf and returns. If a callback function is * provided, H5Dgather() repeatedly gathers up to \p dst_buf_size * bytes to process the serialized data. * * The callback function \p op should process, store, or otherwise, * make use of the data returned in \p dst_buf before it returns, * because the buffer will be overwritten unless it is the last * call to the callback. This function will be repeatedly called * until all gathered elements have been passed to the callback * in \p dst_buf. The callback function should return zero (0) * to indicate success, and a negative value to indicate failure. * * \since 1.10.2 * */ H5_DLL herr_t H5Dgather(hid_t src_space_id, const void *src_buf, hid_t type_id, size_t dst_buf_size, void *dst_buf, H5D_gather_func_t op, void *op_data); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Closes the specified dataset * * \dset_id * * \return \herr_t * * \details H5Dclose() terminates access to a dataset via the identifier * \p dset_id and releases the underlying resources. * * \par Example * \snippet H5D_examples.c read * * \since 1.8.0 * * \see H5Dcreate2(), H5Dopen2() * */ H5_DLL herr_t H5Dclose(hid_t dset_id); /// \cond DEV /* Internal API routines */ H5_DLL herr_t H5Ddebug(hid_t dset_id); H5_DLL herr_t H5Dformat_convert(hid_t dset_id); H5_DLL herr_t H5Dget_chunk_index_type(hid_t did, H5D_chunk_index_t *idx_type); /// \endcond /* Symbols defined for compatibility with previous versions of the HDF5 API. * * Use of these symbols is deprecated. */ #ifndef H5_NO_DEPRECATED_SYMBOLS /* Macros */ #define H5D_CHUNK_BTREE H5D_CHUNK_IDX_BTREE /* Formerly used to support the H5DOread/write_chunk() API calls. * These symbols are no longer used in the library. */ /* Property names for H5DOwrite_chunk */ #define H5D_XFER_DIRECT_CHUNK_WRITE_FLAG_NAME "direct_chunk_flag" #define H5D_XFER_DIRECT_CHUNK_WRITE_FILTERS_NAME "direct_chunk_filters" #define H5D_XFER_DIRECT_CHUNK_WRITE_OFFSET_NAME "direct_chunk_offset" #define H5D_XFER_DIRECT_CHUNK_WRITE_DATASIZE_NAME "direct_chunk_datasize" /* Property names for H5DOread_chunk */ #define H5D_XFER_DIRECT_CHUNK_READ_FLAG_NAME "direct_chunk_read_flag" #define H5D_XFER_DIRECT_CHUNK_READ_OFFSET_NAME "direct_chunk_read_offset" #define H5D_XFER_DIRECT_CHUNK_READ_FILTERS_NAME "direct_chunk_read_filters" /* Typedefs */ /* Function prototypes */ /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Creates a dataset at the specified location * * \fgdta_loc_id * \param[in] name Name of the dataset to create * \type_id * \space_id * \dcpl_id * * \return \hid_t{dataset} * * \deprecation_note{H5Dcreate2() or the macro H5Dcreate()} * * \details H5Dcreate1() creates a data set with a name, \p name, in the * location specified by the identifier \p loc_id. \p loc_id may be a * file, group, dataset, named datatype or attribute. If an attribute, * dataset, or named datatype is specified for \p loc_id then the * dataset will be created at the location where the attribute, * dataset, or named datatype is attached. * * \p name can be a relative path based at \p loc_id or an absolute * path from the root of the file. Use of this function requires that * any intermediate groups specified in the path already exist. * * The dataset’s datatype and dataspace are specified by \p type_id and * \p space_id, respectively. These are the datatype and dataspace of * the dataset as it will exist in the file, which may differ from the * datatype and dataspace in application memory. * * Names within a group are unique: H5Dcreate1() will return an error * if a link with the name specified in name already exists at the * location specified in \p loc_id. * * As is the case for any object in a group, the length of a dataset * name is not limited. * * \p dcpl_id is an #H5P_DATASET_CREATE property list created with \p * H5reate1() and initialized with various property list functions * described in Property List Interface. * * H5Dcreate() and H5Dcreate_anon() return an error if the dataset’s * datatype includes a variable-length (VL) datatype and the fill value * is undefined, i.e., set to \c NULL in the dataset creation property * list. Such a VL datatype may be directly included, indirectly * included as part of a compound or array datatype, or indirectly * included as part of a nested compound or array datatype. * * H5Dcreate() and H5Dcreate_anon() return a dataset identifier for * success or a negative value for failure. The dataset identifier * should eventually be closed by calling H5Dclose() to release the * resources it uses. * * See H5Dcreate_anon() for a discussion of the differences between * H5Dcreate() and H5Dcreate_anon(). * * The HDF5 library provides flexible means of specifying a fill value, * of specifying when space will be allocated for a dataset, and of * specifying when fill values will be written to a dataset. * * \version 1.8.0 Function H5Dcreate() renamed to H5Dcreate1() and deprecated in this release. * \since 1.0.0 * * \see H5Dopen2(), H5Dclose(), H5Tset_size() * */ H5_DLL hid_t H5Dcreate1(hid_t loc_id, const char *name, hid_t type_id, hid_t space_id, hid_t dcpl_id); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Opens an existing dataset * * \fgdta_loc_id * \param[in] name Name of the dataset to access * * \return \hid_t{dataset} * * \deprecation_note{H5Dopen2() or the macro H5Dopen()} * * \details H5Dopen1() opens an existing dataset for access at the location * specified by \p loc_id. \p loc_id may be a file, group, dataset, * named datatype or attribute. If an attribute, dataset, or named * datatype is specified for loc_id then the dataset will be opened at * the location where the attribute, dataset, or named datatype is * attached. name is a dataset name and is used to identify the dataset * in the file. * * A dataset opened with this function should be closed with H5Dclose() * when the dataset is no longer needed so that resource leaks will not * develop. * * \version 1.8.0 Function H5Dopen() renamed to H5Dopen1() and deprecated in this release. * \since 1.0.0 * */ H5_DLL hid_t H5Dopen1(hid_t loc_id, const char *name); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Extends a dataset * * \dset_id * \param[in] size Array containing the new size of each dimension * * \return \herr_t * * \deprecation_note{H5Dset_extent()} * * \details H5Dextend() verifies that the dataset is at least of size \p size, * extending it if necessary. The length of \p size is the same as * that of the dataspace of the dataset being changed. * * This function can be applied to the following datasets: * \li Any dataset with unlimited dimensions * \li A dataset with fixed dimensions if the current dimension sizes * are less than the maximum sizes set with \c maxdims * (see H5Screate_simple()) * * Space on disk is immediately allocated for the new dataset extent if * the dataset’s space allocation time is set to * #H5D_ALLOC_TIME_EARLY. Fill values will be written to the dataset if * the dataset’s fill time is set to #H5D_FILL_TIME_IFSET or * #H5D_FILL_TIME_ALLOC. (See H5Pset_fill_time() and * H5Pset_alloc_time().) * * This function ensures that the dataset dimensions are of at least * the sizes specified in size. The function H5Dset_extent() must be * used if the dataset dimension sizes are to be reduced. * * \version 1.8.0 Function deprecated in this release. Parameter size * syntax changed to \Code{const hsize_t size[]} in this release. * */ H5_DLL herr_t H5Dextend(hid_t dset_id, const hsize_t size[]); /** * -------------------------------------------------------------------------- * \ingroup H5D * * \brief Reclaims variable-length (VL) datatype memory buffers * * \type_id * \space_id * \dxpl_id * \param[in] buf Pointer to the buffer to be reclaimed * * \return \herr_t * * \deprecation_note{H5Treclaim()} * * \details H5Dvlen_reclaim() reclaims memory buffers created to store VL * datatypes. * * The \p type_id must be the datatype stored in the buffer. The \p * space_id describes the selection for the memory buffer to free the * VL datatypes within. The \p dxpl_id is the dataset transfer property * list that was used for the I/O transfer to create the buffer. And * \p buf is the pointer to the buffer to be reclaimed. * * The VL structures (\ref hvl_t) in the user's buffer are modified to * zero out the VL information after the memory has been reclaimed. * * If nested VL datatypes were used to create the buffer, this routine * frees them from the bottom up, releasing all the memory without * creating memory leaks. * * \version 1.12.0 Function was deprecated * */ H5_DLL herr_t H5Dvlen_reclaim(hid_t type_id, hid_t space_id, hid_t dxpl_id, void *buf); #endif /* H5_NO_DEPRECATED_SYMBOLS */ #ifdef __cplusplus } #endif #endif /* H5Dpublic_H */