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/******************************************************************************
* Project: PROJ.4
* Purpose: Implementation of pj_open_lib(), and pj_set_finder(). These
* provide a standard interface for opening projections support
* data files.
* Author: Gerald Evenden, Frank Warmerdam <warmerdam@pobox.com>
*
******************************************************************************
* Copyright (c) 1995, Gerald Evenden
* Copyright (c) 2002, 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 "proj_internal.h"
#include <projects.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
static const char *(*pj_finder)(const char *) = NULL;
static int path_count = 0;
static char **search_path = NULL;
static char * proj_lib_name =
#ifdef PROJ_LIB
PROJ_LIB;
#else
0;
#endif
/************************************************************************/
/* pj_set_finder() */
/************************************************************************/
void pj_set_finder( const char *(*new_finder)(const char *) )
{
pj_finder = new_finder;
}
/************************************************************************/
/* pj_set_searchpath() */
/* */
/* Path control for callers that can't practically provide */
/* pj_set_finder() style callbacks. Call with (0,NULL) as args */
/* to clear the searchpath set. */
/************************************************************************/
void pj_set_searchpath ( int count, const char **path )
{
int i;
if (path_count > 0 && search_path != NULL)
{
for (i = 0; i < path_count; i++)
{
pj_dalloc(search_path[i]);
}
pj_dalloc(search_path);
path_count = 0;
search_path = NULL;
}
if( count > 0 )
{
search_path = pj_malloc(sizeof *search_path * count);
for (i = 0; i < count; i++)
{
search_path[i] = pj_malloc(strlen(path[i]) + 1);
strcpy(search_path[i], path[i]);
}
}
path_count = count;
}
/* just a couple of helper functions that lets other functions
access the otherwise private search path */
const char **proj_get_searchpath(void) {
return (const char **)search_path;
}
int proj_get_path_count(void) {
return path_count;
}
/************************************************************************/
/* pj_open_lib_ex() */
/************************************************************************/
static PAFile
pj_open_lib_ex(projCtx ctx, const char *name, const char *mode,
char* out_full_filename, size_t out_full_filename_size) {
char fname[MAX_PATH_FILENAME+1];
const char *sysname;
PAFile fid;
int n = 0;
int i;
#ifdef WIN32
static const char dir_chars[] = "/\\";
#else
static const char dir_chars[] = "/";
#endif
#ifndef _WIN32_WCE
if( out_full_filename != NULL && out_full_filename_size > 0 )
out_full_filename[0] = '\0';
/* check if ~/name */
if (*name == '~' && strchr(dir_chars,name[1]) )
if ((sysname = getenv("HOME")) != NULL) {
if( strlen(sysname) + 1 + strlen(name) + 1 > sizeof(fname) )
{
return NULL;
}
(void)strcpy(fname, sysname);
fname[n = (int)strlen(fname)] = DIR_CHAR;
fname[++n] = '\0';
(void)strcpy(fname+n, name + 1);
sysname = fname;
} else
return NULL;
/* or fixed path: /name, ./name or ../name */
else if (strchr(dir_chars,*name)
|| (*name == '.' && strchr(dir_chars,name[1]))
|| (!strncmp(name, "..", 2) && strchr(dir_chars,name[2]))
|| (name[1] == ':' && strchr(dir_chars,name[2])) )
sysname = name;
/* or try to use application provided file finder */
else if( pj_finder != NULL && pj_finder( name ) != NULL )
sysname = pj_finder( name );
/* or is environment PROJ_LIB defined */
else if ((sysname = getenv("PROJ_LIB")) || (sysname = proj_lib_name)) {
if( strlen(sysname) + 1 + strlen(name) + 1 > sizeof(fname) )
{
return NULL;
}
(void)strcpy(fname, sysname);
fname[n = (int)strlen(fname)] = DIR_CHAR;
fname[++n] = '\0';
(void)strcpy(fname+n, name);
sysname = fname;
} else /* just try it bare bones */
sysname = name;
if ((fid = pj_ctx_fopen(ctx, sysname, mode)) != NULL)
{
if( out_full_filename != NULL && out_full_filename_size > 0 )
{
strncpy(out_full_filename, sysname, out_full_filename_size);
out_full_filename[out_full_filename_size-1] = '\0';
}
errno = 0;
}
/* If none of those work and we have a search path, try it */
if (!fid && path_count > 0)
{
for (i = 0; fid == NULL && i < path_count; i++)
{
if( strlen(search_path[i]) + 1 + strlen(name) + 1 <= sizeof(fname) )
{
sprintf(fname, "%s%c%s", search_path[i], DIR_CHAR, name);
sysname = fname;
fid = pj_ctx_fopen(ctx, sysname, mode);
}
}
if (fid)
{
if( out_full_filename != NULL && out_full_filename_size > 0 )
{
strncpy(out_full_filename, sysname, out_full_filename_size);
out_full_filename[out_full_filename_size-1] = '\0';
}
errno = 0;
}
}
if( ctx->last_errno == 0 && errno != 0 )
pj_ctx_set_errno( ctx, errno );
pj_log( ctx, PJ_LOG_DEBUG_MAJOR,
"pj_open_lib(%s): call fopen(%s) - %s\n",
name, sysname,
fid == NULL ? "failed" : "succeeded" );
return(fid);
#else
return NULL;
#endif /* _WIN32_WCE */
}
/************************************************************************/
/* pj_open_lib() */
/************************************************************************/
PAFile
pj_open_lib(projCtx ctx, const char *name, const char *mode) {
return pj_open_lib_ex(ctx, name, mode, NULL, 0);
}
/************************************************************************/
/* pj_find_file() */
/************************************************************************/
/** Returns the full filename corresponding to a proj resource file specified
* as a short filename.
*
* @param ctx context.
* @param short_filename short filename (e.g. egm96_15.gtx)
* @param out_full_filename output buffer, of size out_full_filename_size, that
* will receive the full filename on success.
* Will be zero-terminated.
* @param out_full_filename_size size of out_full_filename.
* @return 1 if the file was found, 0 otherwise.
*/
int pj_find_file(projCtx ctx, const char *short_filename,
char* out_full_filename, size_t out_full_filename_size)
{
PAFile f = pj_open_lib_ex(ctx, short_filename, "rb", out_full_filename,
out_full_filename_size);
if( f != NULL )
{
pj_ctx_fclose(ctx, f);
return 1;
}
return 0;
}
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