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hdf5/src/H5Sselect.c
T
Quincey Koziol 6ff8aac3a7 [svn-r19472] Description: 
Create a new, more streamlined method of generating I/O sequences when
there is only a single block defined by a hyperslab.  This improves the
performance of Ger Van Diepen's (LOFAR team) benchmark by about 20%.

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x,
                w/C++ & FORTRAN, w/threadsafe, in debug mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                w/szip filter, w/threadsafe, in production mode
        Linux/PPC 2.6 (heiwa) w/C++ & FORTRAN, w/threadsafe, in debug mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                in production mode
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in debug mode
        Mac OS X/32 10.6.4 (amazon) in debug mode
        Mac OS X/32 10.6.4 (amazon) w/C++ & FORTRAN, w/threadsafe,
                in production mode
        Mac OS X/32 10.6.4 (amazon) w/parallel, in debug mode
2010-09-23 10:03:42 -05:00

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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 files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Programmer: Quincey Koziol <koziol@ncsa.uiuc.ued>
* Friday, May 29, 1998
*
* Purpose: Dataspace selection functions.
*/
#define H5S_PACKAGE /*suppress error about including H5Spkg */
#include "H5private.h" /* Generic Functions */
#include "H5Dprivate.h" /* Datasets */
#include "H5Eprivate.h" /* Error handling */
#include "H5FLprivate.h" /* Free Lists */
#include "H5Iprivate.h" /* IDs */
#include "H5MMprivate.h" /* Memory management */
#include "H5Spkg.h" /* Dataspaces */
#include "H5Vprivate.h" /* Vector and array functions */
#include "H5WBprivate.h" /* Wrapped Buffers */
/* Local functions */
#ifdef LATER
static herr_t H5S_select_iter_block (const H5S_sel_iter_t *iter, hsize_t *start, hsize_t *end);
static htri_t H5S_select_iter_has_next_block (const H5S_sel_iter_t *iter);
static herr_t H5S_select_iter_next_block(H5S_sel_iter_t *iter);
#endif /* LATER */
/*--------------------------------------------------------------------------
NAME
H5S_select_offset
PURPOSE
Set the selection offset for a datapace
USAGE
herr_t H5S_select_offset(space, offset)
H5S_t *space; IN/OUT: Dataspace object to set selection offset
const hssize_t *offset; IN: Offset to position the selection at
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Sets the selection offset for the dataspace
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
Only works for simple dataspaces currently
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_offset(H5S_t *space, const hssize_t *offset)
{
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_offset)
/* Check args */
HDassert(space);
HDassert(space->extent.rank);
HDassert(offset);
/* Copy the offset over */
HDmemcpy(space->select.offset, offset, sizeof(hssize_t)*space->extent.rank);
/* Indicate that the offset was changed */
space->select.offset_changed = TRUE;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5S_select_offset() */
/*--------------------------------------------------------------------------
NAME
H5S_select_copy
PURPOSE
Copy a selection from one dataspace to another
USAGE
herr_t H5S_select_copy(dst, src)
H5S_t *dst; OUT: Pointer to the destination dataspace
H5S_t *src; IN: Pointer to the source dataspace
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Copies all the selection information (include offset) from the source
dataspace to the destination dataspace.
If the SHARE_SELECTION flag is set, then the selection can be shared
between the source and destination dataspaces. (This should only occur in
situations where the destination dataspace will immediately change to a new
selection)
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_copy (H5S_t *dst, const H5S_t *src, hbool_t share_selection)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI(H5S_select_copy, FAIL)
/* Check args */
assert(dst);
assert(src);
/* Copy regular fields */
dst->select=src->select;
/* Perform correct type of copy based on the type of selection */
if((ret_value=(*src->select.type->copy)(dst,src,share_selection))<0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy selection specific information")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_copy() */
/*-------------------------------------------------------------------------
* Function: H5S_select_release
*
* Purpose: Releases all memory associated with a dataspace selection.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Friday, May 30, 2003
*
* Note: This routine participates in the "Inlining C function pointers"
* pattern, don't call it directly, use the appropriate macro
* defined in H5Sprivate.h.
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5S_select_release(H5S_t *ds)
{
herr_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_release)
assert(ds);
/* Call the selection type's release function */
ret_value=(*ds->select.type->release)(ds);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_release() */
/*-------------------------------------------------------------------------
* Function: H5S_select_get_seq_list
*
* Purpose: Retrieves the next sequence of offset/length pairs for an
* iterator on a dataspace
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Tuesday, May 18, 2004
*
* Note: This routine participates in the "Inlining C function pointers"
* pattern, don't call it directly, use the appropriate macro
* defined in H5Sprivate.h.
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5S_select_get_seq_list(const H5S_t *space, unsigned flags,
H5S_sel_iter_t *iter, size_t maxseq, size_t maxbytes,
size_t *nseq, size_t *nbytes, hsize_t *off, size_t *len)
{
herr_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_get_seq_list)
HDassert(space);
/* Call the selection type's get_seq_list function */
ret_value = (*space->select.type->get_seq_list)(space, flags, iter, maxseq, maxbytes, nseq, nbytes, off, len);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_get_seq_list() */
/*-------------------------------------------------------------------------
* Function: H5S_select_serial_size
*
* Purpose: Determines the number of bytes required to store the current
* selection
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Tuesday, May 18, 2004
*
* Note: This routine participates in the "Inlining C function pointers"
* pattern, don't call it directly, use the appropriate macro
* defined in H5Sprivate.h.
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
hssize_t
H5S_select_serial_size(const H5S_t *space)
{
hssize_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_serial_size)
assert(space);
/* Call the selection type's serial_size function */
ret_value=(*space->select.type->serial_size)(space);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_serial_size() */
/*--------------------------------------------------------------------------
NAME
H5S_select_serialize
PURPOSE
Serialize the selection for a dataspace into a buffer
USAGE
herr_t H5S_select_serialize(space, buf)
const H5S_t *space; IN: Dataspace with selection to serialize
uint8_t *buf; OUT: Buffer to put serialized selection
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Calls the appropriate dataspace selection callback to serialize the
current selection into a buffer.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_serialize(const H5S_t *space, uint8_t *buf)
{
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_serialize)
assert(space);
assert(buf);
/* Call the selection type's serialize function */
ret_value=(*space->select.type->serialize)(space,buf);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_serialize() */
/*--------------------------------------------------------------------------
NAME
H5Sget_select_npoints
PURPOSE
Get the number of elements in current selection
USAGE
hssize_t H5Sget_select_npoints(dsid)
hid_t dsid; IN: Dataspace ID of selection to query
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Returns the number of elements in current selection for dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5Sget_select_npoints(hid_t spaceid)
{
H5S_t *space; /* Dataspace to modify selection of */
hssize_t ret_value; /* return value */
FUNC_ENTER_API(H5Sget_select_npoints, FAIL)
H5TRACE1("Hs", "i", spaceid);
/* Check args */
if(NULL == (space = (H5S_t *)H5I_object_verify(spaceid, H5I_DATASPACE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")
ret_value = (hssize_t)H5S_GET_SELECT_NPOINTS(space);
done:
FUNC_LEAVE_API(ret_value)
} /* H5Sget_select_npoints() */
/*--------------------------------------------------------------------------
NAME
H5S_get_select_npoints
PURPOSE
Get the number of elements in current selection
USAGE
hssize_t H5Sget_select_npoints(space)
H5S_t *space; IN: Dataspace of selection to query
RETURNS
The number of elements in selection on success, 0 on failure
DESCRIPTION
Returns the number of elements in current selection for dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5S_get_select_npoints(const H5S_t *space)
{
FUNC_ENTER_NOAPI_NOFUNC(H5S_get_select_npoints)
/* Check args */
HDassert(space);
FUNC_LEAVE_NOAPI((hssize_t)space->select.num_elem)
} /* H5S_get_select_npoints() */
/*--------------------------------------------------------------------------
NAME
H5Sselect_valid
PURPOSE
Check whether the selection fits within the extent, with the current
offset defined.
USAGE
htri_t H5Sselect_void(dsid)
hid_t dsid; IN: Dataspace ID to query
RETURNS
TRUE if the selection fits within the extent, FALSE if it does not and
Negative on an error.
DESCRIPTION
Determines if the current selection at the current offet fits within the
extent for the dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
EXAMPLES
REVISION LOG
Christian Chilan 01/17/2007
Changed the error return value from 0 to FAIL.
--------------------------------------------------------------------------*/
htri_t
H5Sselect_valid(hid_t spaceid)
{
H5S_t *space; /* Dataspace to modify selection of */
htri_t ret_value; /* return value */
FUNC_ENTER_API(H5Sselect_valid, FAIL)
H5TRACE1("t", "i", spaceid);
/* Check args */
if(NULL == (space = (H5S_t *)H5I_object_verify(spaceid, H5I_DATASPACE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")
ret_value = H5S_SELECT_VALID(space);
done:
FUNC_LEAVE_API(ret_value)
} /* H5Sselect_valid() */
/*--------------------------------------------------------------------------
NAME
H5S_select_valid
PURPOSE
Check whether the selection fits within the extent, with the current
offset defined.
USAGE
htri_t H5S_select_void(space)
H5S_t *space; IN: Dataspace to query
RETURNS
TRUE if the selection fits within the extent, FALSE if it does not and
Negative on an error.
DESCRIPTION
Determines if the current selection at the current offet fits within the
extent for the dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_valid(const H5S_t *space)
{
htri_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_valid)
assert(space);
ret_value = (*space->select.type->is_valid)(space);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_valid() */
/*--------------------------------------------------------------------------
NAME
H5S_select_deserialize
PURPOSE
Deserialize the current selection from a user-provided buffer into a real
selection in the dataspace.
USAGE
herr_t H5S_select_deserialize(space, buf)
H5S_t *space; IN/OUT: Dataspace pointer to place selection into
uint8 *buf; IN: Buffer to retrieve serialized selection from
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Deserializes the current selection into a buffer. (Primarily for retrieving
from disk). This routine just hands off to the appropriate routine for each
type of selection. The format of the serialized information is shown in
the H5S_select_serialize() header.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_deserialize (H5S_t *space, const uint8_t *buf)
{
const uint8_t *tbuf; /* Temporary pointer to the selection type */
uint32_t sel_type; /* Pointer to the selection type */
herr_t ret_value=FAIL; /* return value */
FUNC_ENTER_NOAPI(H5S_select_deserialize, FAIL)
assert(space);
tbuf=buf;
UINT32DECODE(tbuf, sel_type);
switch(sel_type) {
case H5S_SEL_POINTS: /* Sequence of points selected */
ret_value=(*H5S_sel_point->deserialize)(space,buf);
break;
case H5S_SEL_HYPERSLABS: /* Hyperslab selection defined */
ret_value=(*H5S_sel_hyper->deserialize)(space,buf);
break;
case H5S_SEL_ALL: /* Entire extent selected */
ret_value=(*H5S_sel_all->deserialize)(space,buf);
break;
case H5S_SEL_NONE: /* Nothing selected */
ret_value=(*H5S_sel_none->deserialize)(space,buf);
break;
default:
break;
}
if(ret_value<0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTLOAD, FAIL, "can't deserialize selection")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_deserialize() */
/*--------------------------------------------------------------------------
NAME
H5Sget_select_bounds
PURPOSE
Gets the bounding box containing the selection.
USAGE
herr_t H5S_get_select_bounds(space, start, end)
hid_t dsid; IN: Dataspace ID of selection to query
hsize_t start[]; OUT: Starting coordinate of bounding box
hsize_t end[]; OUT: Opposite coordinate of bounding box
RETURNS
Non-negative on success, negative on failure
DESCRIPTION
Retrieves the bounding box containing the current selection and places
it into the user's buffers. The start and end buffers must be large
enough to hold the dataspace rank number of coordinates. The bounding box
exactly contains the selection, ie. if a 2-D element selection is currently
defined with the following points: (4,5), (6,8) (10,7), the bounding box
with be (4, 5), (10, 8). Calling this function on a "none" selection
returns fail.
The bounding box calculations _does_ include the current offset of the
selection within the dataspace extent.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sget_select_bounds(hid_t spaceid, hsize_t start[], hsize_t end[])
{
H5S_t *space; /* Dataspace to modify selection of */
herr_t ret_value; /* return value */
FUNC_ENTER_API(H5Sget_select_bounds, FAIL)
H5TRACE3("e", "i*h*h", spaceid, start, end);
/* Check args */
if(start == NULL || end == NULL)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pointer")
if(NULL == (space = (H5S_t *)H5I_object_verify(spaceid, H5I_DATASPACE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")
ret_value = H5S_SELECT_BOUNDS(space, start, end);
done:
FUNC_LEAVE_API(ret_value)
} /* H5Sget_select_bounds() */
/*--------------------------------------------------------------------------
NAME
H5S_get_select_bounds
PURPOSE
Gets the bounding box containing the selection.
USAGE
herr_t H5S_get_select_bounds(space, start, end)
H5S_t *space; IN: Dataspace ID of selection to query
hsize_t *start; OUT: Starting coordinate of bounding box
hsize_t *end; OUT: Opposite coordinate of bounding box
RETURNS
Non-negative on success, negative on failure
DESCRIPTION
Retrieves the bounding box containing the current selection and places
it into the user's buffers. The start and end buffers must be large
enough to hold the dataspace rank number of coordinates. The bounding box
exactly contains the selection, ie. if a 2-D element selection is currently
defined with the following points: (4,5), (6,8) (10,7), the bounding box
with be (4, 5), (10, 8). Calling this function on a "none" selection
returns fail.
The bounding box calculations _does_ include the current offset of the
selection within the dataspace extent.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_get_select_bounds(const H5S_t *space, hsize_t *start, hsize_t *end)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_get_select_bounds)
/* Check args */
assert(space);
assert(start);
assert(end);
ret_value = (*space->select.type->bounds)(space,start,end);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_get_select_bounds() */
/*--------------------------------------------------------------------------
NAME
H5S_get_select_offset
PURPOSE
Gets the linear offset of the first element for the selection.
USAGE
herr_t H5S_get_select_offset(space, offset)
const H5S_t *space; IN: Dataspace pointer of selection to query
hsize_t *offset; OUT: Linear offset of first element in selection
RETURNS
Non-negative on success, negative on failure
DESCRIPTION
Retrieves the linear offset (in "units" of elements) of the first element
selected within the dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
The offset calculation _does_ include the current offset of the
selection within the dataspace extent.
Calling this function on a "none" selection returns fail.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_get_select_offset(const H5S_t *space, hsize_t *offset)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_get_select_offset)
/* Check args */
HDassert(space);
HDassert(offset);
ret_value = (*space->select.type->offset)(space, offset);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_get_select_offset() */
/*--------------------------------------------------------------------------
NAME
H5S_select_is_contiguous
PURPOSE
Determines if a selection is contiguous in the dataspace
USAGE
htri_t H5S_select_is_contiguous(space)
const H5S_t *space; IN: Dataspace of selection to query
RETURNS
Non-negative (TRUE/FALSE) on success, negative on failure
DESCRIPTION
Checks the selection to determine if the points to iterated over will be
contiguous in the particular dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_is_contiguous(const H5S_t *space)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_is_contiguous)
/* Check args */
assert(space);
ret_value = (*space->select.type->is_contiguous)(space);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_is_contiguous() */
/*--------------------------------------------------------------------------
NAME
H5S_select_is_single
PURPOSE
Determines if a selection is a single block in the dataspace
USAGE
htri_t H5S_select_is_single(space)
const H5S_t *space; IN: Dataspace of selection to query
RETURNS
Non-negative (TRUE/FALSE) on success, negative on failure
DESCRIPTION
Checks the selection to determine if it occupies a single block in the
particular dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_is_single(const H5S_t *space)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_is_single)
/* Check args */
assert(space);
ret_value = (*space->select.type->is_single)(space);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_is_single() */
/*--------------------------------------------------------------------------
NAME
H5S_select_is_regular
PURPOSE
Determines if a selection is "regular" in the dataspace
USAGE
htri_t H5S_select_is_regular(space)
const H5S_t *space; IN: Dataspace of selection to query
RETURNS
Non-negative (TRUE/FALSE) on success, negative on failure
DESCRIPTION
Checks the selection to determine if it is "regular" (i.e. a single
block or a strided pattern) in the particular dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_is_regular(const H5S_t *space)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_is_regular)
/* Check args */
assert(space);
ret_value = (*space->select.type->is_regular)(space);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_is_regular() */
/*--------------------------------------------------------------------------
NAME
H5S_select_adjust_u
PURPOSE
Adjust a selection by subtracting an offset
USAGE
herr_t H5S_select_adjust_u(space, offset)
H5S_t *space; IN/OUT: Pointer to dataspace to adjust
const hsize_t *offset; IN: Offset to subtract
RETURNS
Non-negative on success, negative on failure
DESCRIPTION
Moves a selection by subtracting an offset from it.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_adjust_u(H5S_t *space, const hsize_t *offset)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_adjust_u)
/* Check args */
HDassert(space);
ret_value = (*space->select.type->adjust_u)(space, offset);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_adjust_u() */
/*--------------------------------------------------------------------------
NAME
H5S_select_project_scalar
PURPOSE
Project a single element selection for a scalar dataspace
USAGE
herr_t H5S_select_project_scalar(space, offset)
const H5S_t *space; IN: Pointer to dataspace to project
hsize_t *offset; IN/OUT: Offset of projected point
RETURNS
Non-negative on success, negative on failure
DESCRIPTION
Projects a selection of a single element into a scalar dataspace, computing
the offset of the element in the original selection.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_project_scalar(const H5S_t *space, hsize_t *offset)
{
herr_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_project_scalar)
/* Check args */
HDassert(space);
HDassert(offset);
ret_value = (*space->select.type->project_scalar)(space, offset);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_project_scalar() */
/*--------------------------------------------------------------------------
NAME
H5S_select_project_simple
PURPOSE
Project a selection onto/into a dataspace of different rank
USAGE
herr_t H5S_select_project_simple(space, new_space, offset)
const H5S_t *space; IN: Pointer to dataspace to project
H5S_t *new_space; IN/OUT: Pointer to dataspace projected onto
hsize_t *offset; IN/OUT: Offset of projected point
RETURNS
Non-negative on success, negative on failure
DESCRIPTION
Projects a selection onto/into a simple dataspace, computing
the offset of the first element in the original selection.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_project_simple(const H5S_t *space, H5S_t *new_space, hsize_t *offset)
{
herr_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_project_simple)
/* Check args */
HDassert(space);
HDassert(new_space);
HDassert(offset);
ret_value = (*space->select.type->project_simple)(space, new_space, offset);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_project_simple() */
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_init
PURPOSE
Initializes iteration information for a selection.
USAGE
herr_t H5S_select_iter_init(sel_iter, space, elmt_size)
H5S_sel_iter_t *sel_iter; OUT: Selection iterator to initialize.
H5S_t *space; IN: Dataspace object containing selection to
iterate over
size_t elmt_size; IN: Size of elements in the selection
RETURNS
Non-negative on success, negative on failure.
DESCRIPTION
Initialize the selection iterator object to point to the first element
in the dataspace's selection.
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_init(H5S_sel_iter_t *sel_iter, const H5S_t *space, size_t elmt_size)
{
herr_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_iter_init)
/* Check args */
assert(sel_iter);
assert(space);
/* Initialize common information */
/* Save the dataspace's rank */
sel_iter->rank=space->extent.rank;
/* Point to the dataspace dimensions, if there are any */
if(sel_iter->rank > 0)
sel_iter->dims = space->extent.size;
else
sel_iter->dims = NULL;
/* Save the element size */
sel_iter->elmt_size=elmt_size;
/* Call initialization routine for selection type */
ret_value= (*space->select.type->iter_init)(sel_iter, space);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_init() */
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_coords
PURPOSE
Get the coordinates of the current iterator position
USAGE
herr_t H5S_select_iter_coords(sel_iter,coords)
H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
hsize_t *coords; OUT: Array to place iterator coordinates in
RETURNS
Non-negative on success, negative on failure.
DESCRIPTION
The current location of the iterator within the selection is placed in
the COORDS array.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_coords (const H5S_sel_iter_t *sel_iter, hsize_t *coords)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_iter_coords)
/* Check args */
assert(sel_iter);
assert(coords);
/* Call iter_coords routine for selection type */
ret_value = (*sel_iter->type->iter_coords)(sel_iter,coords);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_coords() */
#ifdef LATER
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_block
PURPOSE
Get the block of the current iterator position
USAGE
herr_t H5S_select_iter_block(sel_iter,start,end)
const H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
hsize_t *start; OUT: Array to place iterator start block coordinates
hsize_t *end; OUT: Array to place iterator end block coordinates
RETURNS
Non-negative on success, negative on failure.
DESCRIPTION
The current location of the iterator within the selection is placed in
the COORDS array.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_select_iter_block (const H5S_sel_iter_t *iter, hsize_t *start, hsize_t *end)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5S_select_iter_block)
/* Check args */
assert(iter);
assert(start);
assert(end);
/* Call iter_block routine for selection type */
ret_value = (*iter->type->iter_block)(iter,start,end);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_block() */
#endif /* LATER */
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_nelmts
PURPOSE
Get the number of elements left to iterate over in selection
USAGE
hssize_t H5S_select_iter_nelmts(sel_iter)
H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
RETURNS
The number of elements in selection on success, 0 on failure
DESCRIPTION
Returns the number of elements in current selection for dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
hsize_t
H5S_select_iter_nelmts (const H5S_sel_iter_t *sel_iter)
{
hsize_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_iter_nelmts)
/* Check args */
assert(sel_iter);
/* Call iter_nelmts routine for selection type */
ret_value = (*sel_iter->type->iter_nelmts)(sel_iter);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_nelmts() */
#ifdef LATER
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_has_next_block
PURPOSE
Check if there is another block available in the selection iterator
USAGE
htri_t H5S_select_iter_has_next_block(sel_iter)
const H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
RETURNS
Non-negative on success, negative on failure.
DESCRIPTION
Check if there is another block available to advance to in the selection
iterator.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
static htri_t
H5S_select_iter_has_next_block (const H5S_sel_iter_t *iter)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5S_select_iter_has_next_block)
/* Check args */
assert(iter);
/* Call iter_has_next_block routine for selection type */
ret_value = (*iter->type->iter_has_next_block)(iter);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_has_next_block() */
#endif /* LATER */
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_next
PURPOSE
Advance selection iterator to next element
USAGE
herr_t H5S_select_iter_next(iter, nelem)
H5S_sel_iter_t *iter; IN/OUT: Selection iterator to change
size_t nelem; IN: Number of elements to advance by
RETURNS
Non-negative on success, negative on failure.
DESCRIPTION
Move the current element for the selection iterator to the NELEM'th next
element in the selection.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_next(H5S_sel_iter_t *iter, size_t nelem)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_iter_next)
/* Check args */
assert(iter);
assert(nelem>0);
/* Call iter_next routine for selection type */
ret_value = (*iter->type->iter_next)(iter,nelem);
/* Decrement the number of elements left in selection */
iter->elmt_left-=nelem;
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_next() */
#ifdef LATER
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_next_block
PURPOSE
Advance selection iterator to next block
USAGE
herr_t H5S_select_iter_next_block(iter)
H5S_sel_iter_t *iter; IN/OUT: Selection iterator to change
RETURNS
Non-negative on success, negative on failure.
DESCRIPTION
Move the current element for the selection iterator to the next
block in the selection.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
Doesn't maintain the 'elmt_left' field of the selection iterator.
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_select_iter_next_block(H5S_sel_iter_t *iter)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5S_select_iter_next_block)
/* Check args */
assert(iter);
/* Call iter_next_block routine for selection type */
ret_value = (*iter->type->iter_next_block)(iter);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_next_block() */
#endif /* LATER */
/*--------------------------------------------------------------------------
NAME
H5S_select_iter_release
PURPOSE
Release a selection iterator's resources.
USAGE
hssize_t H5S_select_iter_release(sel_iter)
H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
RETURNS
The number of elements in selection on success, 0 on failure
DESCRIPTION
Returns the number of elements in current selection for dataspace.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_release(H5S_sel_iter_t *sel_iter)
{
herr_t ret_value; /* return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_select_iter_release)
/* Check args */
assert(sel_iter);
/* Call selection type-specific release routine */
ret_value = (*sel_iter->type->iter_release)(sel_iter);
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_iter_release() */
/*--------------------------------------------------------------------------
NAME
H5S_select_iterate
PURPOSE
Iterate over the selected elements in a memory buffer.
USAGE
herr_t H5S_select_iterate(buf, type_id, space, operator, operator_data)
void *buf; IN/OUT: Buffer containing elements to iterate over
hid_t type_id; IN: Datatype ID of BUF array.
H5S_t *space; IN: Dataspace object containing selection to iterate over
H5D_operator_t op; IN: Function pointer to the routine to be
called for each element in BUF iterated over.
void *operator_data; IN/OUT: Pointer to any user-defined data
associated with the operation.
RETURNS
Returns the return value of the last operator if it was non-zero, or zero
if all elements were processed. Otherwise returns a negative value.
DESCRIPTION
Iterates over the selected elements in a memory buffer, calling the user's
callback function for each element. The selection in the dataspace is
modified so that any elements already iterated over are removed from the
selection if the iteration is interrupted (by the H5D_operator_t function
returning non-zero) in the "middle" of the iteration and may be re-started
by the user where it left off.
NOTE: Until "subtracting" elements from a selection is implemented,
the selection is not modified.
--------------------------------------------------------------------------*/
herr_t
H5S_select_iterate(void *buf, hid_t type_id, const H5S_t *space, H5D_operator_t op,
void *operator_data)
{
H5T_t *dt; /* Datatype structure */
H5S_sel_iter_t iter; /* Selection iteration info */
hbool_t iter_init = FALSE; /* Selection iteration info has been initialized */
uint8_t *loc; /* Current element location in buffer */
hsize_t coords[H5O_LAYOUT_NDIMS]; /* Coordinates of element in dataspace */
hssize_t nelmts; /* Number of elements in selection */
hsize_t space_size[H5O_LAYOUT_NDIMS]; /* Dataspace size */
hsize_t off[H5D_IO_VECTOR_SIZE]; /* Array to store sequence offsets */
hsize_t curr_off; /* Current offset within sequence */
hsize_t tmp_off; /* Temporary offset within sequence */
size_t len[H5D_IO_VECTOR_SIZE]; /* Array to store sequence lengths */
size_t curr_len; /* Length of bytes left to process in sequence */
size_t nseq; /* Number of sequences generated */
size_t curr_seq; /* Current sequnce being worked on */
size_t nelem; /* Number of elements used in sequences */
size_t max_elem; /* Maximum number of elements allowed in sequences */
size_t elmt_size; /* Datatype size */
unsigned ndims; /* Number of dimensions in dataspace */
int i; /* Local Index variable */
herr_t user_ret=0; /* User's return value */
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5S_select_iterate, FAIL)
/* Check args */
HDassert(buf);
HDassert(H5I_DATATYPE == H5I_get_type(type_id));
HDassert(space);
HDassert(op);
/* Get the datatype size */
if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an valid base datatype")
if(0 == (elmt_size = H5T_get_size(dt)))
HGOTO_ERROR(H5E_DATATYPE, H5E_BADSIZE, FAIL, "datatype size invalid")
/* Initialize iterator */
if(H5S_select_iter_init(&iter, space, elmt_size) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
iter_init = TRUE; /* Selection iteration info has been initialized */
/* Get the number of elements in selection */
if((nelmts = (hssize_t)H5S_GET_SELECT_NPOINTS(space)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements selected")
/* Get the rank of the dataspace */
ndims = space->extent.rank;
if(ndims > 0) {
/* Copy the size of the space */
HDassert(space->extent.size);
HDmemcpy(space_size, space->extent.size, ndims * sizeof(hsize_t));
} /* end if */
space_size[ndims] = elmt_size;
/* Compute the maximum number of bytes required */
H5_ASSIGN_OVERFLOW(max_elem, nelmts, hssize_t, size_t);
/* Loop, while elements left in selection */
while(max_elem > 0 && user_ret == 0) {
/* Get the sequences of bytes */
if(H5S_SELECT_GET_SEQ_LIST(space, 0, &iter, (size_t)H5D_IO_VECTOR_SIZE, max_elem, &nseq, &nelem, off, len) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "sequence length generation failed")
/* Loop, while sequences left to process */
for(curr_seq=0; curr_seq<nseq && user_ret==0; curr_seq++) {
/* Get the current offset */
curr_off = off[curr_seq];
/* Get the number of bytes in sequence */
curr_len = len[curr_seq];
/* Loop, while bytes left in sequence */
while(curr_len > 0 && user_ret == 0) {
/* Compute the coordinate from the offset */
for(i = (int)ndims, tmp_off = curr_off; i >= 0; i--) {
coords[i] = tmp_off % space_size[i];
tmp_off /= space_size[i];
} /* end for */
/* Get the location within the user's buffer */
loc = (unsigned char *)buf + curr_off;
/* Call user's callback routine */
user_ret=(*op)(loc,type_id,ndims,coords,operator_data);
/* Increment offset in dataspace */
curr_off+=elmt_size;
/* Decrement number of bytes left in sequence */
curr_len-=elmt_size;
} /* end while */
} /* end for */
/* Decrement number of elements left to process */
max_elem-=nelem;
} /* end while */
/* Set return value */
ret_value=user_ret;
done:
/* Release selection iterator */
if(iter_init && H5S_SELECT_ITER_RELEASE(&iter) < 0)
HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iterate() */
/*--------------------------------------------------------------------------
NAME
H5Sget_select_type
PURPOSE
Retrieve the type of selection in a dataspace
USAGE
H5S_sel_type H5Sget_select_type(space_id)
hid_t space_id; IN: Dataspace object to query
RETURNS
Non-negative on success/Negative on failure. Return value is from the
set of values in the H5S_sel_type enumerated type.
DESCRIPTION
This function retrieves the type of selection currently defined for
a dataspace.
--------------------------------------------------------------------------*/
H5S_sel_type
H5Sget_select_type(hid_t space_id)
{
H5S_t *space; /* dataspace to modify */
H5S_sel_type ret_value; /* Return value */
FUNC_ENTER_API(H5Sget_select_type, H5S_SEL_ERROR)
H5TRACE1("St", "i", space_id);
/* Check args */
if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, H5S_SEL_ERROR, "not a dataspace")
/* Set return value */
ret_value = H5S_GET_SELECT_TYPE(space);
done:
FUNC_LEAVE_API(ret_value)
} /* end H5Sget_select_type() */
/*--------------------------------------------------------------------------
NAME
H5S_get_select_type
PURPOSE
Retrieve the type of selection in a dataspace
USAGE
H5S_sel_type H5Sget_select_type(space)
const H5S_t *space; IN: Dataspace object to query
RETURNS
Non-negative on success/Negative on failure. Return value is from the
set of values in the H5S_sel_type enumerated type.
DESCRIPTION
This function retrieves the type of selection currently defined for
a dataspace.
COMMENTS
This routine participates in the "Inlining C function pointers"
pattern, don't call it directly, use the appropriate macro
defined in H5Sprivate.h.
--------------------------------------------------------------------------*/
H5S_sel_type
H5S_get_select_type(const H5S_t *space)
{
H5S_sel_type ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOFUNC(H5S_get_select_type)
/* Check args */
assert(space);
/* Set return value */
ret_value=H5S_GET_SELECT_TYPE(space);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_get_select_type() */
/*--------------------------------------------------------------------------
NAME
H5S_select_shape_same
PURPOSE
Check if two selections are the same shape
USAGE
htri_t H5S_select_shape_same(space1, space2)
const H5S_t *space1; IN: 1st Dataspace pointer to compare
const H5S_t *space2; IN: 2nd Dataspace pointer to compare
RETURNS
TRUE/FALSE/FAIL
DESCRIPTION
Checks to see if the current selection in the dataspaces are the same
dimensionality and shape.
This is primarily used for reading the entire selection in one swoop.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
Assumes that there is only a single "block" for hyperslab selections.
EXAMPLES
REVISION LOG
Modified function to view identical shapes with different dimensions
as being the same under some circumstances.
--------------------------------------------------------------------------*/
htri_t
H5S_select_shape_same(const H5S_t *space1, const H5S_t *space2)
{
H5S_sel_iter_t iter_a; /* Selection a iteration info */
H5S_sel_iter_t iter_b; /* Selection b iteration info */
hbool_t iter_a_init = 0; /* Selection a iteration info has been initialized */
hbool_t iter_b_init = 0; /* Selection b iteration info has been initialized */
htri_t ret_value = TRUE; /* Return value */
FUNC_ENTER_NOAPI(H5S_select_shape_same, FAIL)
/* Check args */
HDassert(space1);
HDassert(space2);
/* Special case for one or both dataspaces being scalar */
if(space1->extent.rank == 0 || space2->extent.rank == 0) {
/* Check for different number of elements selected */
if(H5S_GET_SELECT_NPOINTS(space1) != H5S_GET_SELECT_NPOINTS(space2))
HGOTO_DONE(FALSE)
} /* end if */
else {
const H5S_t *space_a; /* Dataspace with larger rank */
const H5S_t *space_b; /* Dataspace with smaller rank */
unsigned space_a_rank; /* Number of dimensions of dataspace A */
unsigned space_b_rank; /* Number of dimensions of dataspace B */
/* need to be able to handle spaces of different rank:
*
* To simplify logic, let space_a point to the element of the set
* {space1, space2} with the largest rank or space1 if the ranks
* are identical.
*
* Similarly, let space_b point to the element of {space1, space2}
* with the smallest rank, or space2 if they are identical.
*
* Let: space_a_rank be the rank of space_a,
* space_b_rank be the rank of space_b,
* delta_rank = space_a_rank - space_b_rank.
*
* Set all this up below.
*/
if(space1->extent.rank >= space2->extent.rank) {
space_a = space1;
space_a_rank = space_a->extent.rank;
space_b = space2;
space_b_rank = space_b->extent.rank;
} /* end if */
else {
space_a = space2;
space_a_rank = space_a->extent.rank;
space_b = space1;
space_b_rank = space_b->extent.rank;
} /* end else */
HDassert(space_a_rank >= space_b_rank);
HDassert(space_b_rank > 0);
/* Check for different number of elements selected */
if(H5S_GET_SELECT_NPOINTS(space_a) != H5S_GET_SELECT_NPOINTS(space_b))
HGOTO_DONE(FALSE)
/* Check for "easy" cases before getting into generalized block iteration code */
if((H5S_GET_SELECT_TYPE(space_a) == H5S_SEL_ALL) && (H5S_GET_SELECT_TYPE(space_b) == H5S_SEL_ALL)) {
hsize_t dims1[H5O_LAYOUT_NDIMS]; /* End point of selection block in dataspace #1 */
hsize_t dims2[H5O_LAYOUT_NDIMS]; /* End point of selection block in dataspace #2 */
int space_a_dim; /* Current dimension in dataspace A */
int space_b_dim; /* Current dimension in dataspace B */
if(H5S_get_simple_extent_dims(space_a, dims1, NULL) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get dimensionality")
if(H5S_get_simple_extent_dims(space_b, dims2, NULL) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get dimensionality")
space_a_dim = (int)space_a_rank - 1;
space_b_dim = (int)space_b_rank - 1;
/* recall that space_a_rank >= space_b_rank.
*
* In the following while loop, we test to see if space_a and space_b
* have identical size in all dimensions they have in common.
*/
while(space_b_dim >= 0) {
if(dims1[space_a_dim] != dims2[space_b_dim])
HGOTO_DONE(FALSE)
space_a_dim--;
space_b_dim--;
} /* end while */
/* Since we are selecting the entire spaces, we must also verify that space_a
* has size 1 in all dimensions that it does not share with space_b.
*/
while(space_a_dim >= 0) {
if(dims1[space_a_dim] != 1)
HGOTO_DONE(FALSE)
space_a_dim--;
} /* end while */
} /* end if */
else if((H5S_GET_SELECT_TYPE(space1) == H5S_SEL_NONE) || (H5S_GET_SELECT_TYPE(space2) == H5S_SEL_NONE)) {
HGOTO_DONE(TRUE)
} /* end if */
else if((H5S_GET_SELECT_TYPE(space_a) == H5S_SEL_HYPERSLABS && space_a->select.sel_info.hslab->diminfo_valid)
&& (H5S_GET_SELECT_TYPE(space_b) == H5S_SEL_HYPERSLABS && space_b->select.sel_info.hslab->diminfo_valid)) {
int space_a_dim; /* Current dimension in dataspace A */
int space_b_dim; /* Current dimension in dataspace B */
space_a_dim = (int)space_a_rank - 1;
space_b_dim = (int)space_b_rank - 1;
/* check that the shapes are the same in the common dimensions, and that
* block == 1 in all dimensions that appear only in space_a.
*/
while(space_b_dim >= 0) {
if(space_a->select.sel_info.hslab->opt_diminfo[space_a_dim].stride !=
space_b->select.sel_info.hslab->opt_diminfo[space_b_dim].stride)
HGOTO_DONE(FALSE)
if(space_a->select.sel_info.hslab->opt_diminfo[space_a_dim].count !=
space_b->select.sel_info.hslab->opt_diminfo[space_b_dim].count)
HGOTO_DONE(FALSE)
if(space_a->select.sel_info.hslab->opt_diminfo[space_a_dim].block !=
space_b->select.sel_info.hslab->opt_diminfo[space_b_dim].block)
HGOTO_DONE(FALSE)
space_a_dim--;
space_b_dim--;
} /* end while */
while(space_a_dim >= 0) {
if(space_a->select.sel_info.hslab->opt_diminfo[space_a_dim].block != 1)
HGOTO_DONE(FALSE)
space_a_dim--;
} /* end while */
} /* end if */
/* Iterate through all the blocks in the selection */
else {
hsize_t start_a[H5O_LAYOUT_NDIMS]; /* Start point of selection block in dataspace a */
hsize_t start_b[H5O_LAYOUT_NDIMS]; /* Start point of selection block in dataspace b */
hsize_t end_a[H5O_LAYOUT_NDIMS]; /* End point of selection block in dataspace a */
hsize_t end_b[H5O_LAYOUT_NDIMS]; /* End point of selection block in dataspace b */
hsize_t off_a[H5O_LAYOUT_NDIMS]; /* Offset of selection a blocks */
hsize_t off_b[H5O_LAYOUT_NDIMS]; /* Offset of selection b blocks */
hbool_t first_block = TRUE; /* Flag to indicate the first block */
/* Initialize iterator for each dataspace selection
* Use '0' for element size instead of actual element size to indicate
* that the selection iterator shouldn't be "flattened", since we
* aren't actually going to be doing I/O with the iterators.
*/
if(H5S_select_iter_init(&iter_a, space_a, (size_t)0) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator a")
iter_a_init = 1;
if(H5S_select_iter_init(&iter_b, space_b, (size_t)0) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator b")
iter_b_init = 1;
/* Iterate over all the blocks in each selection */
while(1) {
int space_a_dim; /* Current dimension in dataspace A */
int space_b_dim; /* Current dimension in dataspace B */
htri_t status_a, status_b; /* Status from next block checks */
/* Get the current block for each selection iterator */
if(H5S_SELECT_ITER_BLOCK(&iter_a, start_a, end_a) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get iterator block a")
if(H5S_SELECT_ITER_BLOCK(&iter_b, start_b, end_b) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get iterator block b")
space_a_dim = (int)space_a_rank - 1;
space_b_dim = (int)space_b_rank - 1;
/* The first block only compares the sizes and sets the
* relative offsets for later blocks
*/
if(first_block) {
/* If the block sizes in the common dimensions from
* each selection don't match, get out
*/
while(space_b_dim >= 0) {
if((end_a[space_a_dim] - start_a[space_a_dim]) !=
(end_b[space_b_dim] - start_b[space_b_dim]))
HGOTO_DONE(FALSE)
/* Set the relative locations of the selections */
off_a[space_a_dim] = start_a[space_a_dim];
off_b[space_b_dim] = start_b[space_b_dim];
space_a_dim--;
space_b_dim--;
} /* end while */
/* similarly, if the block size in any dimension that appears only
* in space_a is not equal to 1, get out.
*/
while(space_a_dim >= 0) {
if((end_a[space_a_dim] - start_a[space_a_dim]) != 0)
HGOTO_DONE(FALSE)
/* Set the relative locations of the selections */
off_a[space_a_dim] = start_a[space_a_dim];
space_a_dim--;
} /* end while */
/* Reset "first block" flag */
first_block = FALSE;
} /* end if */
/* Check over the blocks for each selection */
else {
/* for dimensions that space_a and space_b have in common: */
while(space_b_dim >= 0) {
/* Check if the blocks are in the same relative location */
if((start_a[space_a_dim] - off_a[space_a_dim]) !=
(start_b[space_b_dim] - off_b[space_b_dim]))
HGOTO_DONE(FALSE)
/* If the block sizes from each selection doesn't match, get out */
if((end_a[space_a_dim] - start_a[space_a_dim]) !=
(end_b[space_b_dim] - start_b[space_b_dim]))
HGOTO_DONE(FALSE)
space_a_dim--;
space_b_dim--;
} /* end while */
/* For dimensions that appear only in space_a: */
while(space_a_dim >= 0) {
/* If the block size isn't 1, get out */
if((end_a[space_a_dim] - start_a[space_a_dim]) != 0)
HGOTO_DONE(FALSE)
space_a_dim--;
} /* end while */
} /* end else */
/* Check if we are able to advance to the next selection block */
if((status_a = H5S_SELECT_ITER_HAS_NEXT_BLOCK(&iter_a)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to check iterator block a")
if((status_b = H5S_SELECT_ITER_HAS_NEXT_BLOCK(&iter_b)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to check iterator block b")
/* Did we run out of blocks at the same time? */
if((status_a == FALSE) && (status_b == FALSE))
break;
else if(status_a != status_b)
HGOTO_DONE(FALSE)
else {
/* Advance to next block in selection iterators */
if(H5S_SELECT_ITER_NEXT_BLOCK(&iter_a) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to advance to next iterator block a")
if(H5S_SELECT_ITER_NEXT_BLOCK(&iter_b) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to advance to next iterator block b")
} /* end else */
} /* end while */
} /* end else */
} /* end else */
done:
if(iter_a_init)
if(H5S_SELECT_ITER_RELEASE(&iter_a) < 0)
HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator a")
if(iter_b_init)
if(H5S_SELECT_ITER_RELEASE(&iter_b) < 0)
HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator b")
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_shape_same() */
/*--------------------------------------------------------------------------
NAME
H5S_select_construct_projection
PURPOSE
Given a dataspace a of rank n with some selection, construct a new
dataspace b of rank m (m != n), with the selection in a being
topologically identical to that in b (as verified by
H5S_select_shape_same().
This function exists, as some I/O code chokes of topologically
identical selections with different ranks. At least to begin
with, we will deal with the issue by constructing projections
of the memory dataspace with ranks equaling those of the file
dataspace.
Note that if m > n, it is possible that the starting point in the
buffer associated with the memory dataspace will have to be
adjusted to match the projected dataspace. If the buf parameter
is not NULL, the function must return an adjusted buffer base
address in *adj_buf_ptr.
USAGE
htri_t H5S_select_construct_projection(base_space,
new_space_ptr,
new_space_rank,
buf,
adj_buf_ptr)
const H5S_t *base_space; IN: Ptr to Dataspace to project
H5S_t ** new_space_ptr; OUT: Ptr to location in which to return
the address of the projected space
int new_space_rank; IN: Rank of the projected space.
const void * buf; IN: Base address of the buffer
associated with the base space.
May be NULL.
void ** adj_buf_ptr; OUT: If buf != NULL, store the base
address of the section of buf
that is described by *new_space_ptr
in *adj_buf_ptr.
RETURNS
Non-negative on success/Negative on failure.
DESCRIPTION
Construct a new dataspace and associated selection which is a
projection of the supplied dataspace and associated selection into
the specified rank. Return it in *new_space_ptr.
If buf is supplied, computes the base address of the projected
selection in buf, and stores the base address in *adj_buf_ptr.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
The selection in the supplied base_space has thickness 1 in all
dimensions greater than new_space_rank. Note that here we count
dimensions from the fastest changing coordinate to the slowest
changing changing coordinate.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_construct_projection(const H5S_t *base_space, H5S_t **new_space_ptr,
unsigned new_space_rank, const void *buf, void const **adj_buf_ptr, hsize_t element_size)
{
H5S_t * new_space = NULL; /* New dataspace constructed */
hsize_t base_space_dims[H5S_MAX_RANK]; /* Current dimensions of base dataspace */
hsize_t base_space_maxdims[H5S_MAX_RANK]; /* Maximum dimensions of base dataspace */
int sbase_space_rank; /* Signed # of dimensions of base dataspace */
unsigned base_space_rank; /* # of dimensions of base dataspace */
hsize_t projected_space_element_offset = 0; /* Offset of selected element in projected buffer */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5S_select_construct_projection, FAIL)
/* Sanity checks */
HDassert(base_space != NULL);
HDassert((H5S_GET_EXTENT_TYPE(base_space) == H5S_SCALAR) || (H5S_GET_EXTENT_TYPE(base_space) == H5S_SIMPLE));
HDassert(new_space_ptr != NULL);
HDassert((new_space_rank != 0) || (H5S_GET_SELECT_NPOINTS(base_space) <= 1));
HDassert(new_space_rank <= H5S_MAX_RANK);
HDassert((buf == NULL) || (adj_buf_ptr != NULL));
HDassert(element_size > 0 );
/* Get the extent info for the base dataspace */
if((sbase_space_rank = H5S_get_simple_extent_dims(base_space, base_space_dims, base_space_maxdims)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get dimensionality of base space")
base_space_rank = (unsigned)sbase_space_rank;
HDassert(base_space_rank != new_space_rank);
/* Check if projected space is scalar */
if(new_space_rank == 0) {
hssize_t npoints; /* Number of points selected */
/* Retreve the number of elements selected */
if((npoints = (hssize_t)H5S_GET_SELECT_NPOINTS(base_space)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get number of points selected")
HDassert(npoints <= 1);
/* Create new scalar dataspace */
if(NULL == (new_space = H5S_create(H5S_SCALAR)))
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "unable to create scalar dataspace")
/* No need to register the dataspace(i.e. get an ID) as
* we will just be discarding it shortly.
*/
/* Selection for the new space will be either all or
* none, depending on whether the base space has 0 or
* 1 elements selected.
*
* Observe that the base space can't have more than
* one selected element, since its selection has the
* same shape as the file dataspace, and that data
* space is scalar.
*/
if(1 == npoints) {
/* Assuming that the selection in the base dataspace is not
* empty, we must compute the offset of the selected item in
* the buffer associated with the base dataspace.
*
* Since the new space rank is zero, we know that the
* the base space must have rank at least 1 -- and
* hence it is a simple dataspace. However, the
* selection, may be either point, hyperspace, or all.
*
*/
if(H5S_SELECT_PROJECT_SCALAR(base_space, &projected_space_element_offset) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSET, FAIL, "unable to project scalar selection")
} /* end if */
else {
HDassert(0 == npoints);
if(H5S_select_none(new_space) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL, "can't delete default selection")
} /* end else */
} /* end if */
else { /* projected space must be simple */
hsize_t new_space_dims[H5S_MAX_RANK]; /* Current dimensions for new dataspace */
hsize_t new_space_maxdims[H5S_MAX_RANK];/* Maximum dimensions for new dataspace */
unsigned rank_diff; /* Difference in ranks */
/* Set up the dimensions of the new, projected dataspace.
*
* How we do this depends on whether we are projecting up into
* increased dimensions, or down into a reduced number of
* dimensions.
*
* If we are projecting up (the first half of the following
* if statement), we copy the dimensions of the base data
* space into the fastest changing dimensions of the new
* projected dataspace, and set the remaining dimensions to
* one.
*
* If we are projecting down (the second half of the following
* if statement), we just copy the dimensions with the most
* quickly changing dimensions into the dims for the projected
* data set.
*
* This works, because H5S_select_shape_same() will return
* true on selections of different rank iff:
*
* 1) the selection in the lower rank dataspace matches that
* in the dimensions with the fastest changing indicies in
* the larger rank dataspace, and
*
* 2) the selection has thickness 1 in all ranks that appear
* only in the higher rank dataspace (i.e. those with
* more slowly changing indicies).
*/
if(new_space_rank > base_space_rank) {
hsize_t tmp_dim_size = 1; /* Temporary dimension value, for filling arrays */
/* we must copy the dimensions of the base space into
* the fastest changing dimensions of the new space,
* and set the remaining dimensions to 1
*/
rank_diff = new_space_rank - base_space_rank;
H5V_array_fill(new_space_dims, &tmp_dim_size, sizeof(tmp_dim_size), rank_diff);
H5V_array_fill(new_space_maxdims, &tmp_dim_size, sizeof(tmp_dim_size), rank_diff);
HDmemcpy(&new_space_dims[rank_diff], base_space_dims, sizeof(new_space_dims[0]) * base_space_rank);
HDmemcpy(&new_space_maxdims[rank_diff], base_space_maxdims, sizeof(new_space_maxdims[0]) * base_space_rank);
} /* end if */
else { /* new_space_rank < base_space_rank */
/* we must copy the fastest changing dimension of the
* base space into the dimensions of the new space.
*/
rank_diff = base_space_rank - new_space_rank;
HDmemcpy(new_space_dims, &base_space_dims[rank_diff], sizeof(new_space_dims[0]) * new_space_rank);
HDmemcpy(new_space_maxdims, &base_space_maxdims[rank_diff], sizeof(new_space_maxdims[0]) * new_space_rank);
} /* end else */
/* now have the new space rank and dimensions set up --
* so we can create the new simple dataspace.
*/
if(NULL == (new_space = H5S_create_simple(new_space_rank, new_space_dims, new_space_maxdims)))
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't create simple dataspace")
/* No need to register the dataspace(i.e. get an ID) as
* we will just be discarding it shortly.
*/
/* If we get this far, we have successfully created the projected
* dataspace. We must now project the selection in the base
* dataspace into the projected dataspace.
*/
if(H5S_SELECT_PROJECT_SIMPLE(base_space, new_space, &projected_space_element_offset) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSET, FAIL, "unable to project simple selection")
/* If we get this far, we have created the new dataspace, and projected
* the selection in the base dataspace into the new dataspace.
*
* If the base dataspace is simple, check to see if the
* offset_changed flag on the base selection has been set -- if so,
* project the offset into the new dataspace and set the
* offset_changed flag.
*/
if(H5S_GET_EXTENT_TYPE(base_space) == H5S_SIMPLE && base_space->select.offset_changed) {
if(new_space_rank > base_space_rank) {
HDmemset(new_space->select.offset, 0, sizeof(new_space->select.offset[0]) * rank_diff);
HDmemcpy(&new_space->select.offset[rank_diff], base_space->select.offset, sizeof(new_space->select.offset[0]) * base_space_rank);
} /* end if */
else
HDmemcpy(new_space->select.offset, &base_space->select.offset[rank_diff], sizeof(new_space->select.offset[0]) * new_space_rank);
/* Propagate the offset changed flag into the new dataspace. */
new_space->select.offset_changed = TRUE;
} /* end if */
} /* end else */
/* If we have done the projection correctly, the following assertion
* should hold.
*/
HDassert(TRUE == H5S_select_shape_same(base_space, new_space));
/* load the address of the new space into *new_space_ptr */
*new_space_ptr = new_space;
/* now adjust the buffer if required */
if(buf != NULL) {
if(new_space_rank < base_space_rank) {
/* a bit of pointer magic here:
*
* Since we can't do pointer arithmetic on void pointers, we first
* cast buf to a pointer to byte -- i.e. uint8_t.
*
* We then multiply the projected space element offset we
* calculated earlier by the supplied element size, add this
* value to the type cast buf pointer, cast the result back
* to a pointer to void, and assign the result to *adj_buf_ptr.
*/
*adj_buf_ptr = (const void *)(((const uint8_t *)buf) +
((size_t)(projected_space_element_offset * element_size)));
} /* end if */
else
/* No adjustment necessary */
*adj_buf_ptr = buf;
} /* end if */
done:
/* Cleanup on error */
if(ret_value < 0) {
if(new_space && H5S_close(new_space) < 0)
HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release dataspace")
} /* end if */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_construct_projection() */
/*--------------------------------------------------------------------------
NAME
H5S_select_fill
PURPOSE
Fill a selection in memory with a value
USAGE
herr_t H5S_select_fill(fill,fill_size,space,buf)
const void *fill; IN: Pointer to fill value to use
size_t fill_size; IN: Size of elements in memory buffer & size of
fill value
H5S_t *space; IN: Dataspace describing memory buffer &
containing selection to use.
void *buf; IN/OUT: Memory buffer to fill selection in
RETURNS
Non-negative on success/Negative on failure.
DESCRIPTION
Use the selection in the dataspace to fill elements in a memory buffer.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
The memory buffer elements are assumed to have the same datatype as the
fill value being placed into them.
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_fill(const void *fill, size_t fill_size, const H5S_t *space, void *_buf)
{
H5S_sel_iter_t iter; /* Selection iteration info */
hbool_t iter_init = 0; /* Selection iteration info has been initialized */
hssize_t nelmts; /* Number of elements in selection */
size_t max_elem; /* Total number of elements in selection */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5S_select_fill, FAIL)
/* Check args */
HDassert(fill);
HDassert(fill_size > 0);
HDassert(space);
HDassert(_buf);
/* Initialize iterator */
if(H5S_select_iter_init(&iter, space, fill_size) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
iter_init = 1; /* Selection iteration info has been initialized */
/* Get the number of elements in selection */
if((nelmts = (hssize_t)H5S_GET_SELECT_NPOINTS(space)) < 0)
HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements selected")
/* Compute the number of bytes to process */
H5_ASSIGN_OVERFLOW(max_elem, nelmts, hssize_t, size_t);
/* Loop, while elements left in selection */
while(max_elem > 0) {
hsize_t off[H5D_IO_VECTOR_SIZE]; /* Array to store sequence offsets */
size_t len[H5D_IO_VECTOR_SIZE]; /* Array to store sequence lengths */
size_t nseq; /* Number of sequences generated */
size_t curr_seq; /* Current sequnce being worked on */
size_t nelem; /* Number of elements used in sequences */
/* Get the sequences of bytes */
if(H5S_SELECT_GET_SEQ_LIST(space, 0, &iter, (size_t)H5D_IO_VECTOR_SIZE, max_elem, &nseq, &nelem, off, len) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "sequence length generation failed")
/* Loop over sequences */
for(curr_seq = 0; curr_seq < nseq; curr_seq++) {
uint8_t *buf; /* Current location in buffer */
/* Get offset in memory buffer */
buf = (uint8_t *)_buf + off[curr_seq];
/* Fill each sequence in memory with fill value */
HDassert((len[curr_seq] % fill_size) == 0);
H5V_array_fill(buf, fill, fill_size, (len[curr_seq] / fill_size));
} /* end for */
/* Decrement number of elements left to process */
max_elem -= nelem;
} /* end while */
done:
/* Release resouces */
if(iter_init && H5S_SELECT_ITER_RELEASE(&iter) < 0)
HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")
FUNC_LEAVE_NOAPI(ret_value)
} /* H5S_select_fill() */
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