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/******************************************************************************
* Project: PROJ.4
* Purpose: Code to manage the list of currently loaded (cached) PJ_GRIDINFOs
* See pj_gridinfo.c for details of loading individual grids.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2000, Frank Warmerdam <warmerdam@pobox.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#define PJ_LIB__
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include "projects.h"
static PJ_GRIDINFO *grid_list = NULL;
#define PJ_MAX_PATH_LENGTH 1024
/************************************************************************/
/* pj_deallocate_grids() */
/* */
/* Deallocate all loaded grids. */
/************************************************************************/
void pj_deallocate_grids()
{
while( grid_list != NULL )
{
PJ_GRIDINFO *item = grid_list;
grid_list = grid_list->next;
item->next = NULL;
pj_gridinfo_free( pj_get_default_ctx(), item );
}
}
/************************************************************************/
/* pj_gridlist_merge_grid() */
/* */
/* Find/load the named gridfile and merge it into the */
/* last_nadgrids_list. */
/************************************************************************/
static int pj_gridlist_merge_gridfile( projCtx ctx,
const char *gridname,
PJ_GRIDINFO ***p_gridlist,
int *p_gridcount,
int *p_gridmax )
{
int got_match=0;
PJ_GRIDINFO *this_grid, *tail = NULL;
/* -------------------------------------------------------------------- */
/* Try to find in the existing list of loaded grids. Add all */
/* matching grids as with NTv2 we can get many grids from one */
/* file (one shared gridname). */
/* -------------------------------------------------------------------- */
for( this_grid = grid_list; this_grid != NULL; this_grid = this_grid->next)
{
if( strcmp(this_grid->gridname,gridname) == 0 )
{
got_match = 1;
/* don't add to the list if it is invalid. */
if( this_grid->ct == NULL )
return 0;
/* do we need to grow the list? */
if( *p_gridcount >= *p_gridmax - 2 )
{
PJ_GRIDINFO **new_list;
int new_max = *p_gridmax + 20;
new_list = (PJ_GRIDINFO **) pj_calloc(new_max, sizeof(void *));
if (!new_list) {
pj_ctx_set_errno( ctx, ENOMEM );
return 0;
}
if( *p_gridlist != NULL )
{
memcpy( new_list, *p_gridlist,
sizeof(void *) * (*p_gridmax) );
pj_dalloc( *p_gridlist );
}
*p_gridlist = new_list;
*p_gridmax = new_max;
}
/* add to the list */
(*p_gridlist)[(*p_gridcount)++] = this_grid;
(*p_gridlist)[*p_gridcount] = NULL;
}
tail = this_grid;
}
if( got_match )
return 1;
/* -------------------------------------------------------------------- */
/* Try to load the named grid. */
/* -------------------------------------------------------------------- */
this_grid = pj_gridinfo_init( ctx, gridname );
if( this_grid == NULL )
{
return 0;
}
if( tail != NULL )
tail->next = this_grid;
else
grid_list = this_grid;
/* -------------------------------------------------------------------- */
/* Recurse to add the grid now that it is loaded. */
/* -------------------------------------------------------------------- */
return pj_gridlist_merge_gridfile( ctx, gridname, p_gridlist,
p_gridcount, p_gridmax );
}
/************************************************************************/
/* pj_gridlist_from_nadgrids() */
/* */
/* This functions loads the list of grids corresponding to a */
/* particular nadgrids string into a list, and returns it. The */
/* list is kept around till a request is made with a different */
/* string in order to cut down on the string parsing cost, and */
/* the cost of building the list of tables each time. */
/************************************************************************/
PJ_GRIDINFO **pj_gridlist_from_nadgrids( projCtx ctx, const char *nadgrids,
int *grid_count)
{
const char *s;
PJ_GRIDINFO **gridlist = NULL;
int grid_max = 0;
pj_errno = 0;
*grid_count = 0;
pj_acquire_lock();
/* -------------------------------------------------------------------- */
/* Loop processing names out of nadgrids one at a time. */
/* -------------------------------------------------------------------- */
for( s = nadgrids; *s != '\0'; )
{
size_t end_char;
int required = 1;
char name[PJ_MAX_PATH_LENGTH];
if( *s == '@' )
{
required = 0;
s++;
}
for( end_char = 0;
s[end_char] != '\0' && s[end_char] != ',';
end_char++ ) {}
if( end_char >= sizeof(name) )
{
pj_dalloc( gridlist );
pj_ctx_set_errno( ctx, PJD_ERR_FAILED_TO_LOAD_GRID );
pj_release_lock();
return NULL;
}
strncpy( name, s, end_char );
name[end_char] = '\0';
s += end_char;
if( *s == ',' )
s++;
if( !pj_gridlist_merge_gridfile( ctx, name, &gridlist, grid_count,
&grid_max)
&& required )
{
pj_dalloc( gridlist );
pj_ctx_set_errno( ctx, PJD_ERR_FAILED_TO_LOAD_GRID );
pj_release_lock();
return NULL;
}
else
pj_errno = 0;
}
pj_release_lock();
return gridlist;
}
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