Note that these functions are not part of the standard HDF5 distribution; the
software
must be separately downloaded and installed.
For documentation of the underlying HDF5 Library, see
https://support.hdfgroup.org/HDF5/doc
.
A comprehensive guide to this library,
User Guide to the HDF5 High-level
Library for Handling Region References and Hyperslab Selections
is available at
https://support.hdfgroup.org/projects/npoess/HL_NPOESS/doc/UG/NPOESS_HL-UG.pdf
.
Region Reference APIs |
Hyperslab APIs
Bit-field API |
C Code Examples
Example | | Description | | Illustrated function(s) |
ex_lite_read_region.c
| | Read a dataset region, given a set of corner coordinates | |
H5LTread_region |
ex_regref_read.c
| | Create, store and read data associated with region references | |
H5LRget_region_info
H5LRread_region |
ex_lite_copy_region.c
| | Copy a dataset region | |
H5LTcopy_region |
ex_regref_copy_references.c
| | Copy a referenced region and create a new region reference to the copy | |
H5LRcopy_references |
ex_regref_create.c
| | Create region references and create a new dataset composed of data from the referenced regions | |
H5LRcreate_region_references |
ex_ref_to_all.c
| | Create and write a dataset of region references | |
H5LRcreate_ref_to_all |
ex_bitfield.c
| | Read and write quality flag bit-fields | |
H5LTread_bitfield_value |
FORTRAN Code Examples
Example | | Description | | Illustrated function(s) |
ex_lite_read_region.f90
| | Read a dataset region, given a set of corner coordinates | |
H5LTread_region_f |
ex_regref_read.f90
| | Create, store and read data associated with region references | |
H5LRget_region_info_f
H5LRread_region_f |
ex_lite_copy_region.f90
| | Copy a dataset region | |
H5LTcopy_region_f |
ex_regref_copy_reference.f90
| | Copy a referenced region and create a new region reference to the copy | |
H5LRcopy_references_f |
ex_regref_create.f90
| | Create region references and create a new dataset composed of data from the referenced regions | |
H5LRcreate_region_references_f |
ex_ref_to_all.f90
| | Create and write a dataset of region references | |
H5LRcreate_ref_to_all_f |
ex_bitfield.f90
| | Read and write quality flag bit-fields | |
H5LTread_bitfield_value_f |
RFCs
H5LRget_region_info
(
hid_t obj_id
,
const hdset_reg_ref_t *ref
,
size_t *len
,
char *path
,
int*rank
,
hid_t *dtype
,
H5S_sel_type *sel_type
,
size_t *numelem
,
hsize_t *buf
)
H5LRget_region_info
queries information about the data pointed by a region reference ref
. It returns one of the absolute paths to a dataset, length of the path, dataset’s rank and datatype, description of the referenced region and type of the referenced region. Any output argument can be NULL if that argument does not need to be returned.
The parameter obj_id
is an identifier for any object in the HDF5 file containing the referenced object. For example, it can be an identifier of a dataset the region reference belongs to or an identifier of an HDF5 file the dataset with region references is stored in.
The parameter ref
is a region reference to query.
The parameter path
is a pointer to application allocated buffer of size len+1
to return an absolute path to a dataset the region reference points to.
The parameter len
is a length of absolute path string plus the \0 string terminator. If path
parameter is NULL, actual length of the path (+1 for \0 string terminator) is returned to application and can be used to allocate buffer path of an appropriate length len
.
The parameter sel_type
describes the type of the selected region. Possible values can be H5S_SEL_POINTS
for point selection and H5S_SEL_HYPERSLABS
for hyperslab selection.
The parameter numelem
describes how many elements will be placed in the buffer buf
. The number should be interpreted using the value of sel_type
.
If value of sel_type
is H5S_SEL_HYPERSLABS
, the parameter buf
contains numelem
blocks of the coordinates for each simple hyperslab of the referenced region. Each block has length 2*rank
and is organized as follows: <"start" coordinate>, immediately followed by <"opposite" corner coordinate>. The total size of the buffer to hold the description of the region will be 2*rank*numelem
. If region reference points to a contiguous sub-array, then the value of numelem
is 1 and the block contains coordinates of the upper left and lower right corners of the sub-array (or simple hyperslab).
If value of sel_type
is H5S_SEL_POINTS
, the parameter buf
contains numelem
blocks of the coordinates for each selected point of the referenced region. Each block has length rank
and contains coordinates of the element. The total size of the buffer to hold the description of the region will be rank*numelem
.
hid_t obj_id
| IN: Identifier of any object in an HDF5 file the region reference belongs to. | |
const hdset_reg_ref_t *ref
| IN: Region reference to query. | |
size_t *len
| IN/OUT: Size of the buffer to store path in. NOTE: if *path is not NULL then *len must be the appropriate length
| |
char *path
| OUT: Full path that a region reference points to. | |
int *rank
| OUT: The number of dimensions of the dataset dimensions of the dataset pointed by region reference. | |
hid_t *dtype
| OUT: Datatype of the dataset pointed by the region reference. | |
H5S_sel_type *sel_type
| OUT: Type of the selection (point or hyperslab). | |
size_t *numelem
| IN/OUT: Number of coordinate blocks or selected elements. | |
hsize_t *buf
| OUT: Buffer containing description of the region pointed by region reference. |
SUBROUTINE H5LRget_region_info_f(obj_id, ref, error, & length, path, rank, dtype, sel_type, numelem, buf) IMPLICIT NONE INTEGER(hid_t), INTENT(IN) :: obj_id ! Identifier of any object in an HDF5 file the region ! reference belongs to. TYPE(hdset_reg_ref_t_f), INTENT(IN) :: ref ! Region reference to query INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure INTEGER(size_t), INTENT(INOUT), OPTIONAL :: length ! Size of the buffer to store path in ! NOTE: Ifpath
is present thenlength
! is required and must be large enough to holdpath
. ! Returns the trimmed length ofpath
CHARACTER(LEN=*), INTENT(INOUT), DIMENSION(1:1), OPTIONAL :: path ! Full path that a region reference points to INTEGER, INTENT(OUT), OPTIONAL :: rank ! The number of dimensions of the dataset dimensions ! of the dataset pointed by region reference INTEGER(hid_t), INTENT(OUT), OPTIONAL :: dtype ! Datatype of the dataset pointed by the region reference INTEGER, INTENT(OUT), OPTIONAL :: sel_type ! Type of the selection (point or hyperslab) INTEGER(size_t), INTENT(INOUT), OPTIONAL :: numelem ! Number of coordinate blocks or selected elements INTEGER(hsize_t), DIMENSION(*), OPTIONAL :: buf ! Buffer containing description of the region pointed ! by region reference END SUBROUTINE H5LRget_region_info_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LRread_region
(
hid_t loc_id
,
const hdset_reg_ref_t *ref
,
hid_t mem_type
,
size_t *num_elem
,
void *buf
)
H5LRread_region
reads data pointed to by the region reference ref
into the buffer buf
.
num_elem
specifies the number of elements
to be read into buf
.
When the size of the reference region is unknown,
H5LRread_region
can be called with
buf
set to NULL
;
the number of elements in the referenced region
will be returned in num_elem
.
The buffer buf
must be big enough to hold
num_elem
elements of type mem_type
.
For example, if data is read from the referenced region into
an integer buffer, mem_type
should be
H5T_NATIVE_INT
and the buffer must be at least
sizeof(int) * num_elem
bytes in size.
This buffer must be allocated by the application.
hid_t loc_id
| IN: File identifier for the HDF5 file containing the dataset with the referenced region or an object identifier for any object in that file | |
const hdset_reg_ref_t *ref
| IN: Region reference specifying data to be read in | |
hid_t mem_type
| IN: Memory datatype of data read from referenced region into the application buffer | |
size_t *num_elem
| IN/OUT: Number of elements to be read into buffer buf
| |
void *buf
| OUT: Buffer in which data is returned to the application |
SUBROUTINE H5LRread_region_f(loc_id, ref, dtype, numelem, buf, error) IMPLICIT NONE INTEGER(hid_t), INTENT(IN) :: loc_id ! File identifier for the HDF5 file containing the dataset with ! the referenced region or an object identifier for any object ! in that file TYPE(hdset_reg_ref_t_f), INTENT(IN) :: ref ! Region reference specifying data to be read in INTEGER(hid_t), INTENT(IN) :: dtype ! Memory datatype of data read from referenced region into the ! application buffer INTEGER(size_t), INTENT(INOUT) :: numelem ! Number of elements to be read into buffer buf TYPE(C_PTR), INTENT(OUT) :: buf ! Buffer in which data is returned to the application INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LRread_region_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LRcreate_region_references
(
hid_t loc_id
,
size_t num_elem
,
const char **path
,
const hsize_t *block_coord
,
hdset_reg_ref_t *ref_buf
)
H5LRcreate_region_references
is useful when creating large numbers of similar region references.
H5LRcreate_region_references
creates a list of region references given an array of paths to
datasets and another array listing the corner coordinates of the
corresponding hyperslabs.
path
parameter is an array of pointers to strings.
num_elem
specifies the number of region references
to be created, thus specifying the size of the path
and ref_buf
arrays.
Buffer block_coord
has size 2*rank
and is the coordinates of the starting point following by the
coordinates of the ending point of the hyperslab,
repeated num_elem
times for each hyperslab. For example,
creating two region references to two hyperslabs, one with
a rectangular hyperslab region starting at element (2,2) to
element (5,4) and the second rectangular region starting at element (7,7) to
element (9,10), results in block_coord
being {2,2,5,4, 7,7,9,10}.
The rank of the hyperslab will be the same as the rank of the
target dataset.
H5LRcreate_region_references
will
retrieve the rank for each dataset and will use those values to
interpret the values in the buffer.
Please note that rank may vary from one dataset to another.
hid_t loc_id
IN: File identifier for the HDF5 file containing the
referenced regions or
an object identifier for any object in that file
size_t num_elem
IN: Number of elements in the path
and
ref_buf
arrays
const char ** path
IN: Array of pointers to strings, which contain the
paths to the target datasets for the region references
const hsize_t * block_coord
IN: Array of hyperslab coordinates
hdset_reg_ref_t * ref_buf
OUT: Buffer for returning an array of region references
SUBROUTINE H5LRcreate_region_references_f(loc_id, num_elem, path, block_coord, buf, error)
IMPLICIT NONE
INTEGER(hid_t), INTENT(IN) :: loc_id ! File identifier for the HDF5 file containing the
! referenced regions or
! an object identifier for any object in that file
INTEGER(size_t), INTENT(IN) :: num_elem ! Number of elements in the path and ref_buf arrays
CHARACTER(LEN=*), DIMENSION(1:num_elem), INTENT(IN) :: path ! Array of strings, which contain the paths to the
! target datasets for the region references
INTEGER(hsize_t), DIMENSION(:), INTENT(IN) :: block_coord ! Array of hyperslab coordinates
TYPE(hdset_reg_ref_t_f), DIMENSION(1:num_elem), INTENT(OUT) :: buff ! Buffer for returning an array of region references
INTEGER, INTENT(OUT) :: error ! Error code:
! 0 on success and -1 on failure
END SUBROUTINE H5LRcreate_region_references_f
Release
Change
1.0
C function introduced in this release.
1.1
Fortran wrapper introduced in this release.
H5LRmake_dataset
(
hid_t loc_id
,
const char *path
,
hid_t type_id
,
const size_t num_elem
,
const hid_t *obj_id
,
const hdset_reg_ref_t *buf
)
num_elem
of region references
buf
, the function will create a dataset with path
path
, at location specified by loc_id
and of a datatype specified by type_id
, and
will write data associated with each region reference in the order
corresponding to the order of the region references in the buffer.
It is assumed that all referenced hyperslabs have the same
dimensionality, and only the size of the slowest changing dimension
may differ.
Each reference in the buf
array belongs to the file
identified by the corresponding object identifiers in the
array obj_id
.
path
does not exist in loc_id
then the function will create the path specified by path
automatically.
hid_t loc_id
| IN: Location identifier of the dataset to be created | |
const char *path
| IN: Path to the dataset being created | |
hid_t type_id
| IN: Datatype of the dataset | |
const size_t num_elem
| IN: Size of the obj_id and
buf arrays
| |
const hid_t *obj_id
| IN: Array of object identifiers; each identifier describes to which HDF5 file the corresponding region reference belongs to | |
const hdset_reg_ref_t *buf
| IN: Array of region references |
SUBROUTINE H5LRmake_dataset_f(loc_id, path, type_id, & buf_size,loc_id_ref, ref, error) IMPLICIT NONE INTEGER(hid_t), INTENT(IN) :: loc_id ! Location identifier of the dataset to be created CHARACTER(LEN=*), INTENT(IN) :: path ! Path to the dataset being created INTEGER(hid_t), INTENT(IN) :: type_id ! Datatype of the dataset INTEGER(size_t) :: buf_size ! Size of the obj_id and buf arrays INTEGER(hid_t), DIMENSION(1:buf_size), INTENT(IN) :: loc_id_ref ! Array of object identifiers; each identifier describes ! to which HDF5 file the corresponding region ! reference belongs to TYPE(hdset_reg_ref_t_f), DIMENSION(1:buf_size), INTENT(IN) :: ref ! Array of region references INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LRmake_dataset_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LRcopy_region
(
hid_t obj_id
,
hdset_reg_ref_t *ref
,
const char *file_dest
,
const char *path_dest
,
const hsize_t *block_coord_dest
)
ref
in a source file specified by an identifier of
any object in that file obj_id
,
the function will write data to the existing dataset
path_dest
in file file_dest
to the simple hyperslab specified by
block_coord_dest
.
Buffer block_coord_dest
has size 2*rank
and is the coordinates of the starting point following by the
coordinates of the ending point of the hyperslab. For example, to specify
a rectangular hyperslab destination region starting at element (2,2) to
element (5,4) then block_coord_dest
would be {2, 2, 5, 4}.
path
does not exist in the destination file
(as may be the case when writing to a new file) then the dataset will be copied
directly to the path
and block_coord
will be disregarded.
hid_t obj_id
| IN: Identifier of any object in a file dataset region reference belongs to | |
hdset_reg_ref_t *ref
| IN: Dataset region reference | |
const char *file_dest
| IN: Name of the destination file | |
const char *path_dest
| IN: Full path to the destination dataset | |
const hsize_t *block_coord_dest
| IN: Hyperslab coordinates in the destination dataset |
SUBROUTINE H5LRcopy_region_f(obj_id, ref, file_dest, path_dest, block_coord_dest, error) IMPLICIT NONE INTEGER(hid_t), INTENT(IN) :: obj_id ! Identifier of any object in a file ! dataset region reference belongs to TYPE(hdset_reg_ref_t_f), INTENT(IN) :: ref ! Dataset region reference CHARACTER(LEN=*), INTENT(IN) :: file_dest ! Name of the destination file CHARACTER(LEN=*), INTENT(IN) :: path_dest ! Full path to the destination dataset INTEGER(hsize_t), DIMENSION(:), INTENT(IN) :: block_coord_dest ! Hyperslab coordinates in the destination dataset INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LRcopy_region_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LRcopy_reference
(
hid_t obj_id
,
hdset_reg_ref_t *ref
,
const char *file
,
const char *path
,
const hsize_t *block_coord
,
hdset_reg_ref_t *ref_new
)
H5LRcopy_reference
will copy the
hyperslab data referenced by a datasets region reference
into existing dataset specified by its path path
in the file with the name file
,
and to location specified by the hyperslab coordinates
block_coord
.
It will create the region reference ref_new
to point to the new location.
The number of elements in the old and newly specified regions
has to be the same.
Buffer block_coord
has size 2*rank
and is the coordinates of the starting point following by the
coordinates of the ending point of the hyperslab. For example, to extract
a rectangular hyperslab region starting at element (2,2) to
element (5,4) then block_coord
would be {2, 2, 5, 4}.
hid_t obj_id
| IN: Identifier of any object in a file an HDF5 reference belongs to | |
hdset_reg_ref_t ref
| IN: Reference to the datasets region | |
const char *file
| IN: Name of the destination file | |
const char *path
| IN: Full path to the destination dataset | |
const hsize_t *block_coord
| IN: Hyperslab coordinates in the destination dataset | |
hdset_reg_ref_t *ref_new
| OUT: Region reference to the new location of data |
SUBROUTINE H5LRcopy_reference_f( obj_id, ref, file, path, block_coord, ref_new, error ) IMPLICIT NONE INTEGER(hid_t), INTENT(in) :: obj_id ! Identifier of any object in a file an ! HDF5 reference belongs to TYPE(hdset_reg_ref_t_f), INTENT(IN) :: ref ! Reference to the datasets region CHARACTER(LEN=*), INTENT(IN) :: file ! Name of the destination file CHARACTER(LEN=*), INTENT(IN) :: path ! Full path to the destination dataset INTEGER(hsize_t), DIMENSION(:), INTENT(IN) :: block_coord ! Hyperslab coordinates in the destination dataset TYPE(hdset_reg_ref_t_f), INTENT(OUT) :: ref_new ! Region reference to the new location of data INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LRcopy_reference_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LRcreate_ref_to_all
(
hid_t loc_id
,
const char *group_path
,
const char *ds_path
,
H5_index_t index_type
,
H5_iter_order_t order
,
H5R_type_t ref_type
)
H5LRcreate_ref_to_all
creates a dataset with the region references to the data
in all datasets located under a specified group in a file or
creates a dataset with object references to all objects
(groups or datasets) located under a specified group in a file.
Given a dataset path ds_path
in a file specified by
the loc_id
identifier, the function
H5LRcreate_ref_to_all
will create a contiguous
one-dimensional dataset with the region references or
object references depending on the value of the
ref_type
parameter.
When ref_type
is H5R_DATASET_REGION
,
each region reference points to all data in a dataset
encountered by an internally called H5Lvisit
routine, which starts at the group specified by the
loc_id
and group_path
parameters.
In a like manner, when ref_type
is
H5R_OBJECT
, each object reference points to an
object (a group or a dataset) encountered by
H5Lvisit
.
ds_path
does not exist in loc_id
then the function will create the path specified by ds_path
automatically.
index_type
specifies the index to be used.
Valid values include the following:
H5_INDEX_NAME
Alpha-numeric index on name
H5_INDEX_CRT_ORDER
Index on creation order
order
specifies the order in which objects
are to be inspected along the index specified in
index_type
. Valid values include the following:
H5_ITER_INC
Increasing order
H5_ITER_DEC
Decreasing order
H5_ITER_NATIVE
Fastest available order
For more detailed information on these two parameters, see
H5Lvisit
.
ref_type
specifies the type of the reference
to be used. Valid values include the following:
H5R_DATASEY_REGION
Dataset region reference
H5R_OBJECT
Object reference
hid_t loc_id
| IN: File or group identifier | |
const char *group_path
| IN: Absolute or relative path to the group at which traversal starts | |
const char *ds_path
| IN: Absolute or relative path to the dataset with region references to be created | |
H5_index_t index_type
| IN: Index type; valid values include:
| |
H5_iter_order_t order
| IN: Order in which index is traversed; valid values
include:
| |
H5R_type_t ref_type
| IN: Reference type; valid values include:
|
SUBROUTINE H5LRcreate_ref_to_all_f(loc_id, group_path, ds_path, index_type, order, ref_type, error) IMPLICIT NONE INTEGER(hid_t), INTENT(IN) :: loc_id ! File or group identifier CHARACTER(LEN=*), INTENT(IN) :: group_path ! Absolute or relative path to the group at ! which traversal starts CHARACTER(LEN=*), INTENT(IN) :: ds_path ! Absolute or relative path to the dataset ! with region references to be created INTEGER, INTENT(IN) :: index_type ! Index type; valid values include: ! H5_INDEX_NAME_F ! H5_INDEX_CRT_ORDER_F INTEGER, INTENT(IN) :: order ! Order in which index is traversed; valid values include: ! H5_ITER_DEC_F ! H5_ITER_INC_F ! H5_ITER_NATIVE_F INTEGER, INTENT(IN) :: ref_type ! Reference type; valid values include: ! H5R_DATASET_REGION_F ! H5R_OBJECT_F INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LRcreate_ref_to_all_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LTread_region
(
const char *file
,
const char *path
,
const hsize_t *block_coord
,
hid_t mem_type
,
void *buf
)
H5LTread_region
reads data from a region described by the hyperslab coordinates
in block_coord
, located in the dataset specified
by its absolute path path
in a file specified by
its name file
.
Data is read into a buffer buf
of the datatype
that corresponds to the HDF5 datatype specified by
mem_type
.
Buffer block_coord
has size 2*rank
and is the coordinates of the starting point following by the
coordinates of the ending point of the hyperslab. For example, to extract
a rectangular hyperslab region starting at element (2,2) to
element (5,4) then block_coord
would be {2, 2, 5, 4}.
Buffer buf
should be big enough to hold
selected elements of the type that corresponds to the
mem_type
datatype.
const char *file
| IN: Name of file | |
const char *path
| IN: Full path to a dataset | |
const hsize_t *block_coord
| IN: Hyperslab coordinates | |
hid_t mem_type
| IN: Memory datatype, describing the buffer the referenced data will be read into | |
void *buf
| OUT: Buffer containing data from the referenced region |
SUBROUTINE H5LTread_region_f(file, path, block_coord, mem_type, buf, error) IMPLICIT NONE CHARACTER(LEN=*), INTENT(IN) :: file ! Name of file CHARACTER(LEN=*), INTENT(IN) :: path ! Full path to a dataset INTEGER(hsize_t), DIMENSION(:), INTENT(IN) :: block_coord ! Hyperslab coordinates INTEGER(hid_t), INTENT(IN) :: mem_type ! Memory datatype, describing the buffer ! the referenced data will be read into TYPE(C_PTR), INTENT(OUT) :: buf ! Buffer containing data from ! the referenced region INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LTread_region_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LTcopy_region
(
const char *file_src
,
const char *path_src
,
const hsize_t *block_coord_src
,
const char *file_dest
,
const char *path_dest
,
const hsize_t *block_coord_dest
)
path_src
in a file
with the name file_src
, and description of a
simple hyperslab of the source block_coord_src
,
the function will write data to the dataset path_dest in file
file_dest
to the simple hyperslab specified by
block_coord_dest
.
The arrays block_coord_src
and block_coord_dest
have a length of 2*rank and are the coordinates
of the starting point following by the coordinates of the ending point
of the hyperslab. For example, to specify a rectangular hyperslab destination
region starting at element (2,2) to element (5,4) then block_coord_dest
would be {2, 2, 5, 4}.
path_dest
does not exist in the destination file
(as may be the case when writing to a new file) then the dataset will be copied
directly to the path_dest
and block_coord_dest
will be disregarded.
const char *file_src ,
| IN: Name of the source file | |
const char *path_src ,
| IN: Full path to the source dataset | |
const hsize_t *block_coord_src ,
| IN: Hyperslab coordinates in the source dataset | |
const char *file_dest ,
| IN: Name of the destination file | |
const char *path_dest ,
| IN: Full path to the destination dataset | |
const hsize_t *block_coord_dest
| IN: Hyperslab coordinates in the destination dataset |
SUBROUTINE H5LTcopy_region_f(file_src, path_src, block_coord_src, & file_dest, path_dest, block_coord_dest, error) IMPLICIT NONE CHARACTER(LEN=*),INTENT(IN) :: file_src ! Name of the source file CHARACTER(LEN=*),INTENT(IN) :: path_src ! Full path to the source dataset INTEGER(hsize_t), DIMENSION(:),INTENT(IN) :: block_coord_src ! Hyperslab coordinates in the source dataset CHARACTER(LEN=*),INTENT(IN) :: file_dest ! Name of the destination file CHARACTER(LEN=*),INTENT(IN) :: path_dest ! Full path to the destination dataset INTEGER(hsize_t), DIMENSION(:),INTENT(IN) :: block_coord_dest ! Hyperslab coordinates in the destination dataset INTEGER,INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LTcopy_region_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
H5LTread_bitfield_value
(
hid_t dset_id
,
int num_values
,
const unsigned *offsets
,
const unsigned *lengths
,
hid_t space
,
int *buf
)
H5LTread_bitfield_value
reads selected elements from a dataset specified by its
identifier dset_id
, and unpacks the bit-field
values to a buffer buf
.
The parameter space
is a space identifier that
indicates which elements of the dataset should be read.
The parameter offsets
is an array of length
num_values
;
the ith element of the
array holds the value of the starting bit of the
ith bit-field value.
The parameter lengths is an array of length
num_flags
;
the ith element of the array
holds the number of bits to be extracted for the
ith bit-field value.
Extracted bits will be interpreted as a base-2 integer value.
Each value will be converted to the base-10 integer value and
stored in the application buffer. Buffer buf
is allocated by the application and should be big enough
to hold num_sel_elem * num_values
elements
of the specified type, where num_sel_elem
is a number of the elements to be read from the dataset.
Data in the buffer is organized as num_values
values for the first element, followed by the
num_values
values for the second element,
... , followed by the num_values
values for the
num_selected_elem
th
element.
hid_t dset_id
| IN: Identifier of the dataset with bit-field values | |
int num_values
| IN: Number of the values to be extracted | |
const unsigned *offsets
| IN: Array of staring bits to be extracted from the
element
Valid values: 0 (zero) through 7
| |
const unsigned *lengths
| IN: Array of the number of bits to be extracted for each value | |
hid_t space
| IN: Dataspace identifier, describing the elements to be read from the dataset with bit-field values | |
int *buf | OUT: Buffer to read the values in |
SUBROUTINE H5LTread_bitfield_value_f(dset_id, num_values, offset, & lengths, space, buf, dims, error) IMPLICIT NONE INTEGER(hid_t), INTENT(IN) :: dset_id ! Identifier of the dataset with bit-field values INTEGER, INTENT(IN) :: num_values ! Number of the values to be extracted INTEGER, DIMENSION(*), INTENT(IN) :: offset ! Array of staring bits to be extracted from the element ! valid values: 1 through 8 INTEGER, DIMENSION(*), INTENT(IN) :: lengths ! Array of the number of bits to be extracted for each value INTEGER, DIMENSION(:), INTENT(IN) :: dims ! Dimension of the reading buffer,buf
INTEGER(hid_t), INTENT(IN) :: space ! Dataspace identifier, describing the elements to be read from the dataset ! with bit-field values INTEGER, DIMENSION(*), INTENT(OUT) :: buf ! Buffer to read the values in,buf
has dimensionsdims
INTEGER, INTENT(OUT) :: error ! Error code: ! 0 on success and -1 on failure END SUBROUTINE H5LTread_bitfield_value_f
Release | Change |
1.0 | C function introduced in this release. |
1.1 | Fortran wrapper introduced in this release. |
The HDF Group Help Desk:
Describes HDF5 High-Level Region and Hyperslab Functions Release 1.1, September 2010. Last modified: 30 December 2010 | Copyright by The HDF Group |