mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-27 08:49:16 +08:00
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/*********************************************************************
|
|
Copyright 2018, UCAR/Unidata See netcdf/COPYRIGHT file for
|
|
copying and redistribution conditions.
|
|
*********************************************************************/
|
|
|
|
#include "config.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include "ncdispatch.h"
|
|
|
|
#define ID_SHIFT (16)
|
|
#define NCFILELISTLENGTH 0x10000
|
|
|
|
/* Version one just allocates the max space (sizeof(NC*)*2^16)*/
|
|
static NC** nc_filelist = NULL;
|
|
|
|
static int numfiles = 0;
|
|
|
|
/* Common */
|
|
int
|
|
count_NCList(void)
|
|
{
|
|
return numfiles;
|
|
}
|
|
|
|
|
|
void
|
|
free_NCList(void)
|
|
{
|
|
if(numfiles > 0) return; /* not empty */
|
|
if(nc_filelist != NULL) free(nc_filelist);
|
|
nc_filelist = NULL;
|
|
}
|
|
|
|
int
|
|
add_to_NCList(NC* ncp)
|
|
{
|
|
int i;
|
|
int new_id;
|
|
if(nc_filelist == NULL) {
|
|
if (!(nc_filelist = calloc(1, sizeof(NC*)*NCFILELISTLENGTH)))
|
|
return NC_ENOMEM;
|
|
numfiles = 0;
|
|
}
|
|
|
|
new_id = 0; /* id's begin at 1 */
|
|
for(i=1; i < NCFILELISTLENGTH; i++) {
|
|
if(nc_filelist[i] == NULL) {new_id = i; break;}
|
|
}
|
|
if(new_id == 0) return NC_ENOMEM; /* no more slots */
|
|
nc_filelist[new_id] = ncp;
|
|
numfiles++;
|
|
new_id = (new_id << ID_SHIFT);
|
|
ncp->ext_ncid = new_id;
|
|
return NC_NOERR;
|
|
}
|
|
|
|
void
|
|
del_from_NCList(NC* ncp)
|
|
{
|
|
unsigned int ncid = ((unsigned int)ncp->ext_ncid) >> ID_SHIFT;
|
|
if(numfiles == 0 || ncid == 0 || nc_filelist == NULL) return;
|
|
if(nc_filelist[ncid] != ncp) return;
|
|
|
|
nc_filelist[ncid] = NULL;
|
|
numfiles--;
|
|
|
|
/* If all files have been closed, release the filelist memory. */
|
|
if (numfiles == 0)
|
|
free_NCList();
|
|
}
|
|
|
|
NC *
|
|
find_in_NCList(int ext_ncid)
|
|
{
|
|
NC* f = NULL;
|
|
unsigned int ncid = ((unsigned int)ext_ncid) >> ID_SHIFT;
|
|
if(numfiles > 0 && nc_filelist != NULL && ncid < NCFILELISTLENGTH)
|
|
f = nc_filelist[ncid];
|
|
|
|
/* for classic files, ext_ncid must be a multiple of (1<<ID_SHIFT) */
|
|
if (f != NULL && f->model->impl == NC_FORMATX_NC3 && (ext_ncid % (1<<ID_SHIFT)))
|
|
return NULL;
|
|
|
|
return f;
|
|
}
|
|
|
|
/*
|
|
Added to support open by name
|
|
*/
|
|
NC*
|
|
find_in_NCList_by_name(const char* path)
|
|
{
|
|
int i;
|
|
NC* f = NULL;
|
|
if(nc_filelist == NULL)
|
|
return NULL;
|
|
for(i=1; i < NCFILELISTLENGTH; i++) {
|
|
if(nc_filelist[i] != NULL) {
|
|
if(strcmp(nc_filelist[i]->path,path)==0) {
|
|
f = nc_filelist[i];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return f;
|
|
}
|
|
|
|
int
|
|
iterate_NCList(int index, NC** ncp)
|
|
{
|
|
/* Walk from 0 ...; 0 return => stop */
|
|
if(index < 0 || index >= NCFILELISTLENGTH)
|
|
return NC_ERANGE;
|
|
if(ncp) *ncp = nc_filelist[index];
|
|
return NC_NOERR;
|
|
}
|