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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef H5LDpublic_H
#define H5LDpublic_H
#ifdef __cplusplus
extern "C" {
#endif
/**
*-------------------------------------------------------------------------
* \ingroup H5LT
*
* \brief Retrieves the current dimension sizes of a dataset.
*
* \param[in] did The dataset identifier
* \param[out] cur_dims The current dimension sizes of the dataset
*
* \return \herr_t
*
* \details H5LDget_dset_dims() retrieves the current dimension sizes
* for the dataset \p did through the parameter \p cur_dims.
* It will return failure if \p cur_dims is NULL.
*
* \note See Also:
* \note Dataset Watch functions (used with h5watch):
* - H5LDget_dset_dims()
* - H5LDget_dset_elmts()
* - H5LDget_dset_type_size()
*
* \par Example:
* See the example code in H5LDget_dset_elmts() for usage of this routine.
*
* \since 1.10.0
*
*/
H5_HLDLL herr_t H5LDget_dset_dims(hid_t did, hsize_t *cur_dims);
/**
*-------------------------------------------------------------------------
* \ingroup H5LT
*
* \brief Returns the size in bytes of the dataset’s datatype
*
* \param[in] did The dataset identifier
* \param[in] fields The pointer to a comma-separated list of fields for a compound datatype
*
* \return If successful, returns the size in bytes of the
* dataset’s datatype. Otherwise, returns 0.
*
* \details H5LDget_dset_type_size() allows the user to find out the datatype
* size for the dataset associated with \p did. If the
* parameter \p fields is NULL, this routine just returns the size
* of the dataset’s datatype. If the dataset has a compound datatype
* and \p fields is non-NULL, this routine returns the size of the
* datatype(s) for the selected fields specified in \p fields.
* Note that ’,’ is the separator for the fields of a compound
* datatype while ’.’ (dot) is the separator for a nested field.
* Use a backslash ( \ ) to escape characters in field names that
* conflict with these two separators.
*
* \note See Also:
* \note Dataset Watch functions (used with h5watch):
* - H5LDget_dset_dims()
* - H5LDget_dset_elmts()
* - H5LDget_dset_type_size()
*
* \par Example:
* See the example code in H5LDget_dset_elmts() for usage of this routine.
*
* \since 1.10.0
*
*/
H5_HLDLL size_t H5LDget_dset_type_size(hid_t did, const char *fields);
/**
*-------------------------------------------------------------------------
* \ingroup H5LT
*
* \brief Retrieves selected data from the dataset
*
* \param[in] did The dataset identifier
* \param[in] prev_dims The previous dimension size of the dataset
* \param[in] cur_dims The current dimension sizes of the dataset
* \param[in] fields A string containing a comma-separated list
* of fields for a compound datatype
* \param[out] buf Buffer for storing data retrieved from the
* dataset
*
* \return \herr_t
*
* \details H5LDget_dset_dims() retrieves selected data of the dataset
* \p did and stores the data in the parameter \p buf.
* The difference between the parameters \p prev_dims and
* \p cur_dims indicates the dimension sizes of the data to be
* selected from the dataset. Note that \p cur_dims must have
* at least one dimension whose size is greater than the
* corresponding dimension in \p prev_dims. Users can
* determine the size of buf by multiplying the datatype
* size of the dataset by the number of selected elements.
*
* If the parameter \p fields is NULL, this routine returns
* data for the selected elements of the dataset. If \p fields
* is not NULL and the dataset has a compound datatype, \p fields
* is a string containing a comma-separated list of fields.
* Each name in \p fields specifies a field in the compound
* datatype, and this routine returns data of the selected fields
* for the dataset's selected elements. Note that ’,’ is the
* separator for the fields of a compound datatype while
* ’.’ is the separator for a nested field. Use backslash to
* escape characters in field names that conflict with these
* two separators.
*
* \note See Also:
* \note Dataset Watch functions (used with h5watch):
* - H5LDget_dset_dims()
* - H5LDget_dset_elmts()
* - H5LDget_dset_type_size()
*
* \par Examples:
*
* For the first example, \c DSET1 is a two-dimensional chunked dataset with atomic type defined below:
* \snippet H5LDget_dset_elmts.c first_declare
*
* The following coding sample illustrates the reading of
* data elements appended to the dataset \c DSET1:
* \snippet H5LDget_dset_elmts.c first_reading
*
* The output buffer will contain data elements selected from
* \c DSET1 as follows:
* \snippet H5LDget_dset_elmts.c first_output
*
* For the second example, DSET2 is a one-dimensional chunked dataset
* with compound type defined below:
* \snippet H5LDget_dset_elmts.c second_declare
*
* The following coding sample illustrates the reading of data elements
* appended to the dataset \c DSET2 with compound datatype.
* This example selects only 2 fields: the fourth field \c d and a
* subfield of the sixth field \c s2.c:
* \snippet H5LDget_dset_elmts.c second_reading
*
* The output buffer will contain data for \c d and \c s2.c
* selected from \c DSET2 as follows:
* \snippet H5LDget_dset_elmts.c second_output
*
* \since 1.10.0
*
*/
H5_HLDLL herr_t H5LDget_dset_elmts(hid_t did, const hsize_t *prev_dims, const hsize_t *cur_dims,
const char *fields, void *buf);
#ifdef __cplusplus
}
#endif
#endif /* H5LDpublic_H */
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