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/******************************************************************************
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* $Id: pj_gridlist.c,v 1.3 2003/03/18 16:26:58 warmerda Exp $
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* Purpose: Code to manage the list of currently loaded (cached) PJ_GRIDINFOs
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* See pj_gridinfo.c for details of loading individual grids.
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* Author: Frank Warmerdam, warmerdam@pobox.com
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******************************************************************************
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* Copyright (c) 2000, Frank Warmerdam <warmerdam@pobox.com>
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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******************************************************************************
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* $Log: pj_gridlist.c,v $
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* Revision 1.3 2003/03/18 16:26:58 warmerda
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* clear error if missing file is not required
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* Revision 1.2 2003/03/17 19:45:47 warmerda
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* support '@' marker for optional grids
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* Revision 1.1 2003/03/15 06:01:18 warmerda
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static PJ_GRIDINFO *grid_list = NULL;
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/* used only by pj_load_nadgrids() and pj_deallocate_grids() */
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static int last_nadgrids_max = 0;
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static int last_nadgrids_count = 0;
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static PJ_GRIDINFO **last_nadgrids_list = NULL;
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static char *last_nadgrids = NULL;
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/************************************************************************/
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/* pj_deallocate_grids() */
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/* Deallocate all loaded grids. */
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/************************************************************************/
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void pj_deallocate_grids()
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while( grid_list != NULL )
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PJ_GRIDINFO *item = grid_list;
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grid_list = grid_list->next;
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pj_gridinfo_free( item );
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if( last_nadgrids != NULL )
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pj_dalloc( last_nadgrids );
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pj_dalloc( last_nadgrids_list );
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last_nadgrids_list = NULL;
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last_nadgrids_count = 0;
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last_nadgrids_max = 0;
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/************************************************************************/
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/* pj_gridlist_merge_grid() */
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/* Find/load the named gridfile and merge it into the */
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/* last_nadgrids_list. */
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/************************************************************************/
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static int pj_gridlist_merge_gridfile( const char *gridname )
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PJ_GRIDINFO *this_grid, *tail = NULL;
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/* -------------------------------------------------------------------- */
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/* Try to find in the existing list of loaded grids. Add all */
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/* matching grids as with NTv2 we can get many grids from one */
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/* file (one shared gridname). */
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/* -------------------------------------------------------------------- */
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for( this_grid = grid_list; this_grid != NULL; this_grid = this_grid->next)
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if( strcmp(this_grid->gridname,gridname) == 0 )
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/* dont add to the list if it is invalid. */
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if( this_grid->ct == NULL )
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/* do we need to grow the list? */
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if( last_nadgrids_count >= last_nadgrids_max - 2 )
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PJ_GRIDINFO **new_list;
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int new_max = last_nadgrids_max + 20;
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new_list = (PJ_GRIDINFO **) pj_malloc(sizeof(void*) * new_max);
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if( last_nadgrids_list != NULL )
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memcpy( new_list, last_nadgrids_list,
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sizeof(void*) * last_nadgrids_max );
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pj_dalloc( last_nadgrids_list );
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last_nadgrids_list = new_list;
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last_nadgrids_max = new_max;
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/* add to the list */
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last_nadgrids_list[last_nadgrids_count++] = this_grid;
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last_nadgrids_list[last_nadgrids_count] = NULL;
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/* -------------------------------------------------------------------- */
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/* Try to load the named grid. */
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/* -------------------------------------------------------------------- */
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this_grid = pj_gridinfo_init( gridname );
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if( this_grid == NULL )
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/* we should get at least a stub grid with a missing "ct" member */
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tail->next = this_grid;
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grid_list = this_grid;
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/* -------------------------------------------------------------------- */
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/* Recurse to add the grid now that it is loaded. */
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/* -------------------------------------------------------------------- */
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return pj_gridlist_merge_gridfile( gridname );
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/************************************************************************/
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/* pj_gridlist_from_nadgrids() */
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/* This functions loads the list of grids corresponding to a */
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/* particular nadgrids string into a list, and returns it. The */
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/* list is kept around till a request is made with a different */
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/* string in order to cut down on the string parsing cost, and */
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/* the cost of building the list of tables each time. */
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/************************************************************************/
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PJ_GRIDINFO **pj_gridlist_from_nadgrids( const char *nadgrids, int *grid_count)
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if( last_nadgrids != NULL
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&& strcmp(nadgrids,last_nadgrids) == 0 )
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*grid_count = last_nadgrids_count;
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return last_nadgrids_list;
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/* -------------------------------------------------------------------- */
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/* Free old one, if any, and make space for new list. */
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/* -------------------------------------------------------------------- */
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if( last_nadgrids != NULL )
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pj_dalloc(last_nadgrids);
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last_nadgrids = (char *) pj_malloc(strlen(nadgrids)+1);
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strcpy( last_nadgrids, nadgrids );
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last_nadgrids_count = 0;
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/* -------------------------------------------------------------------- */
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/* Loop processing names out of nadgrids one at a time. */
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/* -------------------------------------------------------------------- */
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for( s = nadgrids; *s != '\0'; )
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s[end_char] != '\0' && s[end_char] != ',';
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if( end_char > sizeof(name) )
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strncpy( name, s, end_char );
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name[end_char] = '\0';
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if( !pj_gridlist_merge_gridfile( name ) && required )
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if( last_nadgrids_count > 0 )
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*grid_count = last_nadgrids_count;
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return last_nadgrids_list;
added
removed
src/pj_gridlist.c
