/* * Copyright (C) 1998-2001 NCSA * All rights reserved. * * Programmer: Quincey Koziol * Tuesday, June 16, 1998 * * Purpose: Point selection data space I/O functions. */ #define H5S_PACKAGE /*suppress error about including H5Spkg */ #include "H5private.h" /* Generic Functions */ #include "H5Eprivate.h" /* Error handling */ #include "H5FLprivate.h" /* Free Lists */ #include "H5Iprivate.h" /* ID Functions */ #include "H5MMprivate.h" /* Memory Management functions */ #include "H5Spkg.h" /* Dataspace functions */ #include "H5Vprivate.h" /* Vector functions */ /* Interface initialization */ #define PABLO_MASK H5Spoint_mask #define INTERFACE_INIT NULL static int interface_initialize_g = 0; /* Declare a free list to manage the H5S_pnt_node_t struct */ H5FL_DEFINE_STATIC(H5S_pnt_node_t); /* Declare a free list to manage the H5S_pnt_list_t struct */ H5FL_DEFINE_STATIC(H5S_pnt_list_t); /*------------------------------------------------------------------------- * Function: H5S_point_init * * Purpose: Initializes iteration information for point selection. * * Return: non-negative on success, negative on failure. * * Programmer: Quincey Koziol * Tuesday, June 16, 1998 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5S_point_init (const H5S_t *space, size_t UNUSED elmt_size, H5S_sel_iter_t *sel_iter) { FUNC_ENTER_NOAPI(H5S_point_init, FAIL); /* Check args */ assert (space && H5S_SEL_POINTS==space->select.type); assert (sel_iter); /* Initialize the number of points to iterate over */ sel_iter->pnt.elmt_left=space->select.num_elem; /* Start at the head of the list of points */ sel_iter->pnt.curr=space->select.sel_info.pnt_lst->head; FUNC_LEAVE (SUCCEED); } /*-------------------------------------------------------------------------- NAME H5S_point_add PURPOSE Add a series of elements to a point selection USAGE herr_t H5S_point_add(space, num_elem, coord) H5S_t *space; IN: Dataspace of selection to modify size_t num_elem; IN: Number of elements in COORD array. const hssize_t *coord[]; IN: The location of each element selected RETURNS Non-negative on success/Negative on failure DESCRIPTION This function adds elements to the current point selection for a dataspace GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_point_add (H5S_t *space, H5S_seloper_t op, size_t num_elem, const hssize_t **_coord) { H5S_pnt_node_t *top, *curr, *new_node; /* Point selection nodes */ const hssize_t *coord=(const hssize_t *)_coord; /* Pointer to the actual coordinates */ unsigned i; /* Counter */ herr_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_add, FAIL); assert(space); assert(num_elem>0); assert(coord); assert(op==H5S_SELECT_SET || op==H5S_SELECT_APPEND || op==H5S_SELECT_PREPEND); top=curr=NULL; for(i=0; ipnt = H5MM_malloc(space->extent.u.simple.rank*sizeof(hssize_t)))==NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate coordinate information"); /* Copy over the coordinates */ HDmemcpy(new_node->pnt,coord+(i*space->extent.u.simple.rank),(space->extent.u.simple.rank*sizeof(hssize_t))); /* Link into list */ new_node->next=NULL; if(top==NULL) top=new_node; else curr->next=new_node; curr=new_node; } /* end for */ /* Insert the list of points selected in the proper place */ if(op==H5S_SELECT_SET || op==H5S_SELECT_PREPEND) { /* Append current list, if there is one */ if(space->select.sel_info.pnt_lst->head!=NULL) curr->next=space->select.sel_info.pnt_lst->head; /* Put new list in point selection */ space->select.sel_info.pnt_lst->head=top; } /* end if */ else { /* op==H5S_SELECT_APPEND */ new_node=space->select.sel_info.pnt_lst->head; if(new_node!=NULL) { while(new_node->next!=NULL) new_node=new_node->next; /* Append new list to point selection */ new_node->next=top; } /* end if */ else space->select.sel_info.pnt_lst->head=top; } /* end else */ /* Add the number of elements in the new selection */ space->select.num_elem+=num_elem; ret_value=SUCCEED; done: FUNC_LEAVE (ret_value); } /* H5S_point_add() */ /*------------------------------------------------------------------------- * Function: H5S_point_favail * * Purpose: Figure out the optimal number of elements to transfer to/from the file * * Return: non-negative number of elements on success, zero on failure * * Programmer: Quincey Koziol * Tuesday, June 16, 1998 * * Modifications: * *------------------------------------------------------------------------- */ hsize_t H5S_point_favail (const H5S_t * UNUSED space, const H5S_sel_iter_t *sel_iter, hsize_t max) { FUNC_ENTER_NOAPI(H5S_point_favail, 0); /* Check args */ assert (space && H5S_SEL_POINTS==space->select.type); assert (sel_iter); FUNC_LEAVE (MIN(sel_iter->pnt.elmt_left,max)); } /* H5S_point_favail() */ /*-------------------------------------------------------------------------- NAME H5S_point_release PURPOSE Release point selection information for a dataspace USAGE herr_t H5S_point_release(space) H5S_t *space; IN: Pointer to dataspace RETURNS Non-negative on success/Negative on failure DESCRIPTION Releases all point selection information for a dataspace GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_point_release (H5S_t *space) { H5S_pnt_node_t *curr, *next; /* Point selection nodes */ FUNC_ENTER_NOAPI(H5S_point_release, FAIL); /* Check args */ assert (space); /* Delete all the nodes from the list */ curr=space->select.sel_info.pnt_lst->head; while(curr!=NULL) { next=curr->next; H5MM_xfree(curr->pnt); H5FL_FREE(H5S_pnt_node_t,curr); curr=next; } /* end while */ /* Free & reset the point list header */ H5FL_FREE(H5S_pnt_list_t,space->select.sel_info.pnt_lst); space->select.sel_info.pnt_lst=NULL; /* Reset the number of elements in the selection */ space->select.num_elem=0; FUNC_LEAVE (SUCCEED); } /* H5S_point_release() */ /*-------------------------------------------------------------------------- NAME H5S_point_npoints PURPOSE Compute number of elements in current selection USAGE hsize_t H5S_point_npoints(space) H5S_t *space; IN: Pointer to dataspace RETURNS The number of elements in selection on success, 0 on failure DESCRIPTION Compute number of elements in current selection. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ hsize_t H5S_point_npoints (const H5S_t *space) { FUNC_ENTER_NOAPI(H5S_point_npoints, 0); /* Check args */ assert (space); FUNC_LEAVE (space->select.num_elem); } /* H5S_point_npoints() */ /*-------------------------------------------------------------------------- NAME H5S_point_copy PURPOSE Copy a selection from one dataspace to another USAGE herr_t H5S_point_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 point selection information from the source dataspace to the destination dataspace. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_point_copy (H5S_t *dst, const H5S_t *src) { H5S_pnt_node_t *curr, *new_node, *new_head; /* Point information nodes */ herr_t ret_value=SUCCEED; /* return value */ FUNC_ENTER_NOAPI(H5S_point_copy, FAIL); assert(src); assert(dst); /* Allocate room for the head of the point list */ if((dst->select.sel_info.pnt_lst=H5FL_ALLOC(H5S_pnt_list_t,0))==NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate point node"); curr=src->select.sel_info.pnt_lst->head; new_head=NULL; while(curr!=NULL) { /* Create each point */ if((new_node=H5FL_ALLOC(H5S_pnt_node_t,0))==NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate point node"); if((new_node->pnt = H5MM_malloc(src->extent.u.simple.rank*sizeof(hssize_t)))==NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate coordinate information"); HDmemcpy(new_node->pnt,curr->pnt,(src->extent.u.simple.rank*sizeof(hssize_t))); new_node->next=NULL; /* Keep the order the same when copying */ if(new_head==NULL) new_head=dst->select.sel_info.pnt_lst->head=new_node; else { new_head->next=new_node; new_head=new_node; } /* end else */ curr=curr->next; } /* end while */ done: FUNC_LEAVE (ret_value); } /* end H5S_point_copy() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_valid PURPOSE Check whether the selection fits within the extent, with the current offset defined. USAGE htri_t H5S_point_select_valid(space); H5S_t *space; IN: Dataspace pointer 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 --------------------------------------------------------------------------*/ htri_t H5S_point_select_valid (const H5S_t *space) { H5S_pnt_node_t *curr; /* Point information nodes */ unsigned u; /* Counter */ htri_t ret_value=TRUE; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_valid, FAIL); assert(space); /* Check each point to determine whether selection+offset is within extent */ curr=space->select.sel_info.pnt_lst->head; while(curr!=NULL) { /* Check each dimension */ for(u=0; uextent.u.simple.rank; u++) { /* Check if an offset has been defined */ /* Bounds check the selected point + offset against the extent */ if(((curr->pnt[u]+space->select.offset[u])>(hssize_t)space->extent.u.simple.size[u]) || ((curr->pnt[u]+space->select.offset[u])<0)) { ret_value=FALSE; break; } /* end if */ } /* end for */ curr=curr->next; } /* end while */ FUNC_LEAVE (ret_value); } /* end H5S_point_select_valid() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_serial_size PURPOSE Determine the number of bytes needed to store the serialized point selection information. USAGE hssize_t H5S_point_select_serial_size(space) H5S_t *space; IN: Dataspace pointer to query RETURNS The number of bytes required on success, negative on an error. DESCRIPTION Determines the number of bytes required to serialize the current point selection information for storage on disk. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ hssize_t H5S_point_select_serial_size (const H5S_t *space) { H5S_pnt_node_t *curr; /* Point information nodes */ hssize_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_serial_size, FAIL); assert(space); /* Basic number of bytes required to serialize point selection: * + + + * + + <# of points (4 bytes)> = 24 bytes */ ret_value=24; /* Count points in selection */ curr=space->select.sel_info.pnt_lst->head; while(curr!=NULL) { /* Add 4 bytes times the rank for each element selected */ ret_value+=4*space->extent.u.simple.rank; curr=curr->next; } /* end while */ FUNC_LEAVE (ret_value); } /* end H5S_point_select_serial_size() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_serialize PURPOSE Serialize the current selection into a user-provided buffer. USAGE herr_t H5S_point_select_serialize(space, buf) H5S_t *space; IN: Dataspace pointer of selection to serialize uint8 *buf; OUT: Buffer to put serialized selection into RETURNS Non-negative on success/Negative on failure DESCRIPTION Serializes the current element selection into a buffer. (Primarily for storing on disk). GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_point_select_serialize (const H5S_t *space, uint8_t *buf) { H5S_pnt_node_t *curr; /* Point information nodes */ uint8_t *lenp; /* pointer to length location for later storage */ uint32_t len=0; /* number of bytes used */ unsigned u; /* local counting variable */ herr_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_serialize, FAIL); assert(space); /* Store the preamble information */ UINT32ENCODE(buf, (uint32_t)space->select.type); /* Store the type of selection */ UINT32ENCODE(buf, (uint32_t)1); /* Store the version number */ UINT32ENCODE(buf, (uint32_t)0); /* Store the un-used padding */ lenp=buf; /* keep the pointer to the length location for later */ buf+=4; /* skip over space for length */ /* Encode number of dimensions */ UINT32ENCODE(buf, (uint32_t)space->extent.u.simple.rank); len+=4; /* Encode number of elements */ UINT32ENCODE(buf, (uint32_t)space->select.num_elem); len+=4; /* Encode each point in selection */ curr=space->select.sel_info.pnt_lst->head; while(curr!=NULL) { /* Add 4 bytes times the rank for each element selected */ len+=4*space->extent.u.simple.rank; /* Encode each point */ for(u=0; uextent.u.simple.rank; u++) UINT32ENCODE(buf, (uint32_t)curr->pnt[u]); curr=curr->next; } /* end while */ /* Encode length */ UINT32ENCODE(lenp, (uint32_t)len); /* Store the length of the extra information */ /* Set success */ ret_value=SUCCEED; FUNC_LEAVE (ret_value); } /* H5S_point_select_serialize() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_deserialize PURPOSE Deserialize the current selection from a user-provided buffer. USAGE herr_t H5S_point_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). GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_point_select_deserialize (H5S_t *space, const uint8_t *buf) { H5S_seloper_t op=H5S_SELECT_SET; /* Selection operation */ uint32_t rank; /* Rank of points */ size_t num_elem=0; /* Number of elements in selection */ hssize_t *coord=NULL, *tcoord; /* Pointer to array of elements */ unsigned i,j; /* local counting variables */ herr_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_deserialize, FAIL); /* Check args */ assert(space); assert(buf); /* Deserialize points to select */ buf+=16; /* Skip over selection header */ UINT32DECODE(buf,rank); /* decode the rank of the point selection */ if(rank!=space->extent.u.simple.rank) HGOTO_ERROR(H5E_DATASPACE, H5E_BADRANGE, FAIL, "rank of pointer does not match dataspace"); UINT32DECODE(buf,num_elem); /* decode the number of points */ /* Allocate space for the coordinates */ if((coord = H5MM_malloc(num_elem*rank*sizeof(hssize_t)))==NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate coordinate information"); /* Retrieve the coordinates from the buffer */ for(tcoord=coord,i=0; iextent.u.simple.rank; /* Iterate through the node, checking the bounds on each element */ node=space->select.sel_info.pnt_lst->head; while(node!=NULL) { for(i=0; i(hsize_t)(node->pnt[i]+space->select.offset[i])) start[i]=node->pnt[i]+space->select.offset[i]; if(end[i]<(hsize_t)(node->pnt[i]+space->select.offset[i])) end[i]=node->pnt[i]+space->select.offset[i]; } /* end for */ node=node->next; } /* end while */ FUNC_LEAVE (ret_value); } /* H5Sget_point_bounds() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_contiguous PURPOSE Check if a point selection is contiguous within the dataspace extent. USAGE htri_t H5S_point_select_contiguous(space) H5S_t *space; IN: Dataspace pointer to check RETURNS TRUE/FALSE/FAIL DESCRIPTION Checks to see if the current selection in the dataspace is contiguous. This is primarily used for reading the entire selection in one swoop. This code currently doesn't properly check for contiguousness when there is more than one point, as that would take a lot of extra coding that we don't need now. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ htri_t H5S_point_select_contiguous(const H5S_t *space) { htri_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_contiguous, FAIL); assert(space); /* One point is definitely contiguous */ if(space->select.num_elem==1) ret_value=TRUE; else /* More than one point might be contiguous, but it's complex to check and we don't need it right now */ ret_value=FALSE; FUNC_LEAVE (ret_value); } /* H5S_point_select_contiguous() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_single PURPOSE Check if a point selection is single within the dataspace extent. USAGE htri_t H5S_point_select_contiguous(space) H5S_t *space; IN: Dataspace pointer to check RETURNS TRUE/FALSE/FAIL DESCRIPTION Checks to see if the current selection in the dataspace is a single block. This is primarily used for reading the entire selection in one swoop. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ htri_t H5S_point_select_single(const H5S_t *space) { htri_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_single, FAIL); assert(space); /* One point is definitely contiguous */ if(space->select.num_elem==1) ret_value=TRUE; else ret_value=FALSE; FUNC_LEAVE (ret_value); } /* H5S_point_select_single() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_regular PURPOSE Check if a point selection is "regular" USAGE htri_t H5S_point_select_regular(space) const H5S_t *space; IN: Dataspace pointer to check RETURNS TRUE/FALSE/FAIL DESCRIPTION Checks to see if the current selection in a dataspace is the a regular pattern. This is primarily used for reading the entire selection in one swoop. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS Doesn't check for points selected to be next to one another in a regular pattern yet. EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ htri_t H5S_point_select_regular(const H5S_t *space) { htri_t ret_value=FAIL; /* return value */ FUNC_ENTER_NOAPI(H5S_point_select_regular, FAIL); /* Check args */ assert(space); /* Only simple check for regular points for now... */ if(space->select.num_elem==1) ret_value=TRUE; else ret_value=FALSE; FUNC_LEAVE (ret_value); } /* H5S_point_select_regular() */ /*-------------------------------------------------------------------------- NAME H5S_select_elements PURPOSE Specify a series of elements in the dataspace to select USAGE herr_t H5S_select_elements(dsid, op, num_elem, coord) hid_t dsid; IN: Dataspace ID of selection to modify H5S_seloper_t op; IN: Operation to perform on current selection size_t num_elem; IN: Number of elements in COORD array. const hssize_t **coord; IN: The location of each element selected RETURNS Non-negative on success/Negative on failure DESCRIPTION This function selects array elements to be included in the selection for the dataspace. The COORD array is a 2-D array of size by NUM_ELEM (ie. a list of coordinates in the dataspace). The order of the element coordinates in the COORD array specifies the order that the array elements are iterated through when I/O is performed. Duplicate coordinates are not checked for. The selection operator, OP, determines how the new selection is to be combined with the existing selection for the dataspace. Currently, only H5S_SELECT_SET is supported, which replaces the existing selection with the one defined in this call. When operators other than H5S_SELECT_SET are used to combine a new selection with an existing selection, the selection ordering is reset to 'C' array ordering. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_select_elements (H5S_t *space, H5S_seloper_t op, size_t num_elem, const hssize_t **coord) { herr_t ret_value=SUCCEED; /* return value */ FUNC_ENTER_NOAPI(H5S_select_elements, FAIL); /* Check args */ assert(space); assert(num_elem); assert(coord); assert(op==H5S_SELECT_SET || op==H5S_SELECT_APPEND || op==H5S_SELECT_PREPEND); /* If we are setting a new selection, remove current selection first */ if(op==H5S_SELECT_SET) { if(H5S_select_release(space)<0) { HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL, "can't release point selection"); } /* end if */ } /* end if */ /* Allocate space for the point selection information if necessary */ if(space->select.type!=H5S_SEL_POINTS || space->select.sel_info.pnt_lst==NULL) { if((space->select.sel_info.pnt_lst = H5FL_ALLOC(H5S_pnt_list_t,1))==NULL) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate element information"); } /* end if */ /* Add points to selection */ if(H5S_point_add(space,op,num_elem,coord)<0) { HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL, "can't insert elements"); } /* Set selection type */ space->select.type=H5S_SEL_POINTS; done: FUNC_LEAVE (ret_value); } /* H5S_select_elements() */ /*-------------------------------------------------------------------------- NAME H5Sselect_elements PURPOSE Specify a series of elements in the dataspace to select USAGE herr_t H5Sselect_elements(dsid, op, num_elem, coord) hid_t dsid; IN: Dataspace ID of selection to modify H5S_seloper_t op; IN: Operation to perform on current selection size_t num_elem; IN: Number of elements in COORD array. const hssize_t **coord; IN: The location of each element selected RETURNS Non-negative on success/Negative on failure DESCRIPTION This function selects array elements to be included in the selection for the dataspace. The COORD array is a 2-D array of size by NUM_ELEM (ie. a list of coordinates in the dataspace). The order of the element coordinates in the COORD array specifies the order that the array elements are iterated through when I/O is performed. Duplicate coordinates are not checked for. The selection operator, OP, determines how the new selection is to be combined with the existing selection for the dataspace. Currently, only H5S_SELECT_SET is supported, which replaces the existing selection with the one defined in this call. When operators other than H5S_SELECT_SET are used to combine a new selection with an existing selection, the selection ordering is reset to 'C' array ordering. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5Sselect_elements (hid_t spaceid, H5S_seloper_t op, size_t num_elem, const hssize_t **coord) { H5S_t *space = NULL; /* Dataspace to modify selection of */ herr_t ret_value=SUCCEED; /* return value */ FUNC_ENTER_API(H5Sselect_elements, FAIL); /* Check args */ if (H5I_DATASPACE != H5I_get_type(spaceid) || NULL == (space=H5I_object(spaceid))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space"); } if(coord==NULL || num_elem==0) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "elements not specified"); } /* end if */ if(!(op==H5S_SELECT_SET || op==H5S_SELECT_APPEND || op==H5S_SELECT_PREPEND)) { HRETURN_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "operations other than H5S_SELECT_SET not supported currently"); } /* end if */ /* Call the real element selection routine */ if((ret_value=H5S_select_elements(space,op,num_elem,coord))<0) { HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL, "can't select elements"); } /* end if */ done: FUNC_LEAVE (ret_value); } /* H5Sselect_elements() */ /*-------------------------------------------------------------------------- NAME H5S_point_select_get_seq_list PURPOSE Create a list of offsets & lengths for a selection USAGE herr_t H5S_point_select_get_seq_list(flags,space,iter,elem_size,maxseq,maxbytes,nseq,nbytes,off,len) unsigned flags; IN: Flags for extra information about operation H5S_t *space; IN: Dataspace containing selection to use. H5S_sel_iter_t *iter; IN/OUT: Selection iterator describing last position of interest in selection. size_t elem_size; IN: Size of an element size_t maxseq; IN: Maximum number of sequences to generate size_t maxbytes; IN: Maximum number of bytes to include in the generated sequences size_t *nseq; OUT: Actual number of sequences generated size_t *nbytes; OUT: Actual number of bytes in sequences generated hsize_t *off; OUT: Array of offsets size_t *len; OUT: Array of lengths RETURNS Non-negative on success/Negative on failure. DESCRIPTION Use the selection in the dataspace to generate a list of byte offsets and lengths for the region(s) selected. Start/Restart from the position in the ITER parameter. The number of sequences generated is limited by the MAXSEQ parameter and the number of sequences actually generated is stored in the NSEQ parameter. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ herr_t H5S_point_select_get_seq_list(unsigned flags, const H5S_t *space,H5S_sel_iter_t *iter, size_t elem_size, size_t maxseq, size_t maxbytes, size_t *nseq, size_t *nbytes, hsize_t *off, size_t *len) { hsize_t bytes_left; /* The number of bytes left in the selection */ hsize_t start_bytes_left; /* The initial number of bytes left in the selection */ H5S_pnt_node_t *node; /* Point node */ hsize_t dims[H5O_LAYOUT_NDIMS]; /* Total size of memory buf */ int ndims; /* Dimensionality of space*/ hsize_t acc; /* Coordinate accumulator */ hsize_t loc; /* Coordinate offset */ size_t curr_seq; /* Current sequence being operated on */ int i; /* Local index variable */ herr_t ret_value=SUCCEED; /* return value */ FUNC_ENTER_NOAPI (H5S_point_select_get_seq_list, FAIL); /* Check args */ assert(space); assert(iter); assert(elem_size>0); assert(maxseq>0); assert(maxbytes>0); assert(nseq); assert(nbytes); assert(off); assert(len); /* "round" off the maxbytes allowed to a multiple of the element size */ maxbytes=(maxbytes/elem_size)*elem_size; /* Choose the minimum number of bytes to sequence through */ start_bytes_left=bytes_left=MIN(iter->pnt.elmt_left*elem_size,maxbytes); /* Get the dataspace dimensions */ if ((ndims=H5S_get_simple_extent_dims (space, dims, NULL))<0) HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to retrieve data space dimensions"); /* Walk through the points in the selection, starting at the current */ /* location in the iterator */ node=iter->pnt.curr; curr_seq=0; while(node!=NULL) { /* Compute the offset of each selected point in the buffer */ for(i=ndims-1,acc=elem_size,loc=0; i>=0; i--) { loc+=(node->pnt[i]+space->select.offset[i])*acc; acc*=dims[i]; } /* end for */ /* Check if this is a later point in the selection */ if(curr_seq>0) { /* If a sorted sequence is requested, make certain we don't go backwards in the offset */ if((flags&H5S_GET_SEQ_LIST_SORTED) && locpnt.curr=node->next; iter->pnt.elmt_left--; /* Check if we're finished with all sequences */ if(curr_seq==maxseq) break; /* Check if we're finished with all the bytes available */ if(bytes_left==0) break; /* Advance to the next point */ node=node->next; } /* end while */ /* Set the number of sequences generated */ *nseq=curr_seq; /* Set the number of bytes used */ *nbytes=(start_bytes_left-bytes_left); done: FUNC_LEAVE (ret_value); } /* end H5S_point_select_get_seq_list() */