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netcdf-c/libsrc4/nc4var.c

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/*
This file is part of netcdf-4, a netCDF-like interface for HDF5, or a
HDF5 backend for netCDF, depending on your point of view.
This file handles the nc4 variable functions.
Copyright 2003-2006, University Corporation for Atmospheric
Research. See COPYRIGHT file for copying and redistribution
conditions.
*/
#include <nc4internal.h>
#include "nc4dispatch.h"
#include <math.h>
/* Min and max deflate levels tolerated by HDF5. */
#define MIN_DEFLATE_LEVEL 0
#define MAX_DEFLATE_LEVEL 9
/* This is to track opened HDF5 objects to make sure they are
* closed. */
#ifdef EXTRA_TESTS
extern int num_plists;
#endif /* EXTRA_TESTS */
/* One meg is the minimum buffer size. */
#define ONE_MEG 1048576
/* Szip options. */
#define NC_SZIP_EC_OPTION_MASK 4
#define NC_SZIP_NN_OPTION_MASK 32
#define NC_SZIP_MAX_PIXELS_PER_BLOCK 32
extern int nc4_get_default_fill_value(const NC_TYPE_INFO_T *type_info, void *fill_value);
/* If the HDF5 dataset for this variable is open, then close it and
* reopen it, with the perhaps new settings for chunk caching. */
int
nc4_reopen_dataset(NC_GRP_INFO_T *grp, NC_VAR_INFO_T *var)
{
hid_t access_pid;
if (var->hdf_datasetid)
{
if ((access_pid = H5Pcreate(H5P_DATASET_ACCESS)) < 0)
return NC_EHDFERR;
#ifdef EXTRA_TESTS
num_plists++;
#endif
if (H5Pset_chunk_cache(access_pid, var->chunk_cache_nelems,
var->chunk_cache_size,
var->chunk_cache_preemption) < 0)
return NC_EHDFERR;
if (H5Dclose(var->hdf_datasetid) < 0)
return NC_EHDFERR;
if ((var->hdf_datasetid = H5Dopen2(grp->hdf_grpid, var->name,
access_pid)) < 0)
return NC_EHDFERR;
if (H5Pclose(access_pid) < 0)
return NC_EHDFERR;
#ifdef EXTRA_TESTS
num_plists--;
#endif
}
return NC_NOERR;
}
/* Set chunk cache size for a variable. */
int
NC4_set_var_chunk_cache(int ncid, int varid, size_t size, size_t nelems,
float preemption)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var;
int retval;
/* Check input for validity. */
if (preemption < 0 || preemption > 1)
return NC_EINVAL;
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
/* An attempt to do any of these things on a netCDF-3 file is
* ignored with no error. */
if (!h5)
return NC_NOERR;
assert(nc && grp && h5);
/* Find the var. */
if (varid < 0 || varid >= grp->vars.nelems)
return NC_ENOTVAR;
var = grp->vars.value[varid];
if (!var) return NC_ENOTVAR;
assert(var->varid == varid);
/* Set the values. */
var->chunk_cache_size = size;
var->chunk_cache_nelems = nelems;
var->chunk_cache_preemption = preemption;
if ((retval = nc4_reopen_dataset(grp, var)))
return retval;
return NC_NOERR;
}
/* Need this version for fortran. Accept negative numbers to leave
* settings as they are. */
int
nc_set_var_chunk_cache_ints(int ncid, int varid, int size, int nelems,
int preemption)
{
size_t real_size = H5D_CHUNK_CACHE_NBYTES_DEFAULT;
size_t real_nelems = H5D_CHUNK_CACHE_NSLOTS_DEFAULT;
float real_preemption = H5D_CHUNK_CACHE_W0_DEFAULT;
if (size >= 0)
real_size = ((size_t) size) * MEGABYTE;
if (nelems >= 0)
real_nelems = nelems;
if (preemption >= 0)
real_preemption = preemption / 100.;
return NC4_set_var_chunk_cache(ncid, varid, real_size, real_nelems,
real_preemption);
}
/* Get chunk cache size for a variable. */
int
NC4_get_var_chunk_cache(int ncid, int varid, size_t *sizep,
size_t *nelemsp, float *preemptionp)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var;
int retval;
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
/* Attempting to do any of these things on a netCDF-3 file produces
* an error. */
if (!h5)
return NC_ENOTNC4;
assert(nc && grp && h5);
/* Find the var. */
if (varid < 0 || varid >= grp->vars.nelems)
return NC_ENOTVAR;
var = grp->vars.value[varid];
if (!var) return NC_ENOTVAR;
assert(var->varid == varid);
/* Give the user what they want. */
if (sizep)
*sizep = var->chunk_cache_size;
if (nelemsp)
*nelemsp = var->chunk_cache_nelems;
if (preemptionp)
*preemptionp = var->chunk_cache_preemption;
return NC_NOERR;
}
/* Get chunk cache size for a variable. */
int
nc_get_var_chunk_cache_ints(int ncid, int varid, int *sizep,
int *nelemsp, int *preemptionp)
{
size_t real_size, real_nelems;
float real_preemption;
int ret;
if ((ret = NC4_get_var_chunk_cache(ncid, varid, &real_size,
&real_nelems, &real_preemption)))
return ret;
if (sizep)
*sizep = real_size / MEGABYTE;
if (nelemsp)
*nelemsp = (int)real_nelems;
if(preemptionp)
*preemptionp = (int)(real_preemption * 100);
return NC_NOERR;
}
/* Check a set of chunksizes to see if they specify a chunk that is too big. */
static int
check_chunksizes(NC_GRP_INFO_T *grp, NC_VAR_INFO_T *var, const size_t *chunksizes)
{
double dprod;
size_t type_len;
int d;
int retval;
if ((retval = nc4_get_typelen_mem(grp->nc4_info, var->type_info->nc_typeid, 0, &type_len)))
return retval;
if (var->type_info->nc_type_class == NC_VLEN)
dprod = (double)sizeof(hvl_t);
else
dprod = (double)type_len;
for (d = 0; d < var->ndims; d++)
{
if (chunksizes[d] < 1)
return NC_EINVAL;
dprod *= (double) chunksizes[d];
}
if (dprod > (double) NC_MAX_UINT)
return NC_EBADCHUNK;
return NC_NOERR;
}
/* Find the default chunk nelems (i.e. length of chunk along each
* dimension). */
static int
nc4_find_default_chunksizes2(NC_GRP_INFO_T *grp, NC_VAR_INFO_T *var)
{
int d;
size_t type_size;
float num_values = 1, num_unlim = 0;
int retval;
size_t suggested_size;
#ifdef LOGGING
double total_chunk_size;
#endif
if (var->type_info->nc_type_class == NC_STRING)
type_size = sizeof(char *);
else
type_size = var->type_info->size;
#ifdef LOGGING
/* Later this will become the total number of bytes in the default
* chunk. */
total_chunk_size = (double) type_size;
#endif
/* How many values in the variable (or one record, if there are
* unlimited dimensions). */
for (d = 0; d < var->ndims; d++)
{
assert(var->dim[d]);
if (! var->dim[d]->unlimited)
num_values *= (float)var->dim[d]->len;
else {
num_unlim++;
var->chunksizes[d] = 1; /* overwritten below, if all dims are unlimited */
}
}
/* Special case to avoid 1D vars with unlim dim taking huge amount
of space (DEFAULT_CHUNK_SIZE bytes). Instead we limit to about
4KB */
#define DEFAULT_1D_UNLIM_SIZE (4096) /* TODO: make build-time parameter? */
if (var->ndims == 1 && num_unlim == 1) {
if (DEFAULT_CHUNK_SIZE / type_size <= 0)
suggested_size = 1;
else if (DEFAULT_CHUNK_SIZE / type_size > DEFAULT_1D_UNLIM_SIZE)
suggested_size = DEFAULT_1D_UNLIM_SIZE;
else
suggested_size = DEFAULT_CHUNK_SIZE / type_size;
var->chunksizes[0] = suggested_size / type_size;
LOG((4, "%s: name %s dim %d DEFAULT_CHUNK_SIZE %d num_values %f type_size %d "
"chunksize %ld", __func__, var->name, d, DEFAULT_CHUNK_SIZE, num_values, type_size, var->chunksizes[0]));
}
if (var->ndims > 1 && var->ndims == num_unlim) { /* all dims unlimited */
suggested_size = pow((double)DEFAULT_CHUNK_SIZE/type_size, 1.0/(double)(var->ndims));
for (d = 0; d < var->ndims; d++)
{
var->chunksizes[d] = suggested_size ? suggested_size : 1;
LOG((4, "%s: name %s dim %d DEFAULT_CHUNK_SIZE %d num_values %f type_size %d "
"chunksize %ld", __func__, var->name, d, DEFAULT_CHUNK_SIZE, num_values, type_size, var->chunksizes[d]));
}
}
/* Pick a chunk length for each dimension, if one has not already
* been picked above. */
for (d = 0; d < var->ndims; d++)
if (!var->chunksizes[d])
{
suggested_size = (pow((double)DEFAULT_CHUNK_SIZE/(num_values * type_size),
1.0/(double)(var->ndims - num_unlim)) * var->dim[d]->len - .5);
if (suggested_size > var->dim[d]->len)
suggested_size = var->dim[d]->len;
var->chunksizes[d] = suggested_size ? suggested_size : 1;
LOG((4, "%s: name %s dim %d DEFAULT_CHUNK_SIZE %d num_values %f type_size %d "
"chunksize %ld", __func__, var->name, d, DEFAULT_CHUNK_SIZE, num_values, type_size, var->chunksizes[d]));
}
#ifdef LOGGING
/* Find total chunk size. */
for (d = 0; d < var->ndims; d++)
total_chunk_size *= (double) var->chunksizes[d];
LOG((4, "total_chunk_size %f", total_chunk_size));
#endif
/* But did this result in a chunk that is too big? */
retval = check_chunksizes(grp, var, var->chunksizes);
if (retval)
{
/* Other error? */
if (retval != NC_EBADCHUNK)
return retval;
/* Chunk is too big! Reduce each dimension by half and try again. */
for ( ; retval == NC_EBADCHUNK; retval = check_chunksizes(grp, var, var->chunksizes))
for (d = 0; d < var->ndims; d++)
var->chunksizes[d] = var->chunksizes[d]/2 ? var->chunksizes[d]/2 : 1;
}
/* Do we have any big data overhangs? They can be dangerous to
* babies, the elderly, or confused campers who have had too much
* beer. */
for (d = 0; d < var->ndims; d++)
{
size_t num_chunks;
size_t overhang;
assert(var->chunksizes[d] > 0);
num_chunks = (var->dim[d]->len + var->chunksizes[d] - 1) / var->chunksizes[d];
if(num_chunks > 0) {
overhang = (num_chunks * var->chunksizes[d]) - var->dim[d]->len;
var->chunksizes[d] -= overhang / num_chunks;
}
}
return NC_NOERR;
}
#define NC_ARRAY_GROWBY 4
int nc4_vararray_add(NC_GRP_INFO_T *grp,
NC_VAR_INFO_T *var)
{
NC_VAR_INFO_T **vp = NULL;
if (grp->vars.nalloc == 0) {
assert(grp->vars.nelems == 0);
vp = (NC_VAR_INFO_T **) malloc(NC_ARRAY_GROWBY * sizeof(NC_VAR_INFO_T *));
if(vp == NULL)
return NC_ENOMEM;
grp->vars.value = vp;
grp->vars.nalloc = NC_ARRAY_GROWBY;
}
else if(grp->vars.nelems +1 > grp->vars.nalloc) {
vp = (NC_VAR_INFO_T **) realloc(grp->vars.value,
(grp->vars.nalloc + NC_ARRAY_GROWBY) * sizeof(NC_VAR_INFO_T *));
if(vp == NULL)
return NC_ENOMEM;
grp->vars.value = vp;
grp->vars.nalloc += NC_ARRAY_GROWBY;
}
if(var != NULL) {
assert(var->varid == grp->vars.nelems);
grp->vars.value[grp->vars.nelems] = var;
grp->vars.nelems++;
}
return NC_NOERR;
}
/* This is called when a new netCDF-4 variable is defined. Break it
* down! */
static int
nc_def_var_nc4(int ncid, const char *name, nc_type xtype,
int ndims, const int *dimidsp, int *varidp)
{
NC_GRP_INFO_T *grp;
NC_VAR_INFO_T *var;
NC_DIM_INFO_T *dim;
NC_HDF5_FILE_INFO_T *h5;
NC_TYPE_INFO_T *type_info = NULL;
char norm_name[NC_MAX_NAME + 1];
int d;
int retval;
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_grp_h5(ncid, &grp, &h5)))
BAIL(retval);
assert(grp && h5);
/* If it's not in define mode, strict nc3 files error out,
* otherwise switch to define mode. */
if (!(h5->flags & NC_INDEF))
{
if (h5->cmode & NC_CLASSIC_MODEL)
BAIL(NC_ENOTINDEFINE);
if ((retval = NC4_redef(ncid)))
BAIL(retval);
}
/* Check and normalize the name. */
if ((retval = nc4_check_name(name, norm_name)))
BAIL(retval);
/* Not a Type is, well, not a type.*/
if (xtype == NC_NAT)
BAIL(NC_EBADTYPE);
/* For classic files, only classic types are allowed. */
if (h5->cmode & NC_CLASSIC_MODEL && xtype > NC_DOUBLE)
BAIL(NC_ESTRICTNC3);
/* cast needed for braindead systems with signed size_t */
if((unsigned long) ndims > X_INT_MAX) /* Backward compat */
BAIL(NC_EINVAL);
/* Classic model files have a limit on number of vars. */
if(h5->cmode & NC_CLASSIC_MODEL && h5->nvars >= NC_MAX_VARS)
BAIL(NC_EMAXVARS);
/* Check that this name is not in use as a var, grp, or type. */
if ((retval = nc4_check_dup_name(grp, norm_name)))
BAIL(retval);
/* If the file is read-only, return an error. */
if (h5->no_write)
BAIL(NC_EPERM);
/* Check all the dimids to make sure they exist. */
for (d = 0; d < ndims; d++)
if ((retval = nc4_find_dim(grp, dimidsp[d], &dim, NULL)))
BAIL(retval);
/* These degrubbing messages sure are handy! */
LOG((3, "%s: name %s type %d ndims %d", __func__, norm_name, xtype, ndims));
#ifdef LOGGING
{
int dd;
for (dd = 0; dd < ndims; dd++)
LOG((4, "dimid[%d] %d", dd, dimidsp[dd]));
}
#endif
/* Add the var to the end of the list. */
if ((retval = nc4_var_list_add(&grp->var, &var)))
BAIL(retval);
/* Now fill in the values in the var info structure. */
if (!(var->name = malloc((strlen(norm_name) + 1) * sizeof(char))))
BAIL(NC_ENOMEM);
strcpy(var->name, norm_name);
var->hash = hash_fast(norm_name, strlen(norm_name));
var->varid = grp->nvars++;
var->ndims = ndims;
var->is_new_var = NC_TRUE;
nc4_vararray_add(grp, var);
/* If this is a user-defined type, there is a type_info struct with
* all the type information. For atomic types, fake up a type_info
* struct. */
if (xtype <= NC_STRING)
{
if (!(type_info = calloc(1, sizeof(NC_TYPE_INFO_T))))
BAIL(NC_ENOMEM);
type_info->nc_typeid = xtype;
type_info->endianness = NC_ENDIAN_NATIVE;
if ((retval = nc4_get_hdf_typeid(h5, xtype, &type_info->hdf_typeid,
type_info->endianness)))
BAIL(retval);
if ((type_info->native_hdf_typeid = H5Tget_native_type(type_info->hdf_typeid,
H5T_DIR_DEFAULT)) < 0)
BAIL(NC_EHDFERR);
if ((retval = nc4_get_typelen_mem(h5, type_info->nc_typeid, 0,
&type_info->size)))
BAIL(retval);
/* Set the "class" of the type */
if (xtype == NC_CHAR)
type_info->nc_type_class = NC_CHAR;
else
{
H5T_class_t class;
if ((class = H5Tget_class(type_info->hdf_typeid)) < 0)
BAIL(NC_EHDFERR);
switch(class)
{
case H5T_STRING:
type_info->nc_type_class = NC_STRING;
break;
case H5T_INTEGER:
type_info->nc_type_class = NC_INT;
break;
case H5T_FLOAT:
type_info->nc_type_class = NC_FLOAT;
break;
default:
BAIL(NC_EBADTYPID);
}
}
}
/* If this is a user defined type, find it. */
else
{
if (nc4_find_type(grp->nc4_info, xtype, &type_info))
BAIL(NC_EBADTYPE);
}
/* Point to the type, and increment its ref. count */
var->type_info = type_info;
var->type_info->rc++;
type_info = NULL;
/* Allocate space for dimension information. */
if (ndims)
{
if (!(var->dim = calloc(ndims, sizeof(NC_DIM_INFO_T *))))
BAIL(NC_ENOMEM);
if (!(var->dimids = calloc(ndims, sizeof(int))))
BAIL(NC_ENOMEM);
}
/* Assign dimensions to the variable */
/* At the same time, check to see if this is a coordinate
* variable. If so, it will have the same name as one of its
* dimensions. If it is a coordinate var, is it a coordinate var in
* the same group as the dim? */
/* Also, check whether we should use contiguous or chunked storage */
var->contiguous = NC_TRUE;
for (d = 0; d < ndims; d++)
{
NC_GRP_INFO_T *dim_grp;
/* Look up each dimension */
if ((retval = nc4_find_dim(grp, dimidsp[d], &dim, &dim_grp)))
BAIL(retval);
/* Check for dim index 0 having the same name, in the same group */
if (d == 0 && dim_grp == grp && dim->hash == var->hash && strcmp(dim->name, norm_name) == 0)
{
var->dimscale = NC_TRUE;
dim->coord_var = var;
/* Use variable's dataset ID for the dimscale ID */
if (dim->hdf_dimscaleid)
{
/* Detach dimscale from any variables using it */
if ((retval = rec_detach_scales(grp, dimidsp[d], dim->hdf_dimscaleid)) < 0)
BAIL(retval);
if (H5Dclose(dim->hdf_dimscaleid) < 0)
BAIL(NC_EHDFERR);
dim->hdf_dimscaleid = 0;
/* Now delete the dataset (it will be recreated later, if necessary) */
if (H5Gunlink(grp->hdf_grpid, dim->name) < 0)
BAIL(NC_EDIMMETA);
}
}
/* Check for unlimited dimension and turn off contiguous storage */
/* (unless HDF4 file) */
#ifdef USE_HDF4
if (dim->unlimited && !h5->hdf4)
#else
if (dim->unlimited)
#endif
var->contiguous = NC_FALSE;
/* Track dimensions for variable */
var->dimids[d] = dimidsp[d];
var->dim[d] = dim;
}
/* Determine default chunksizes for this variable. (Even for
* variables which may be contiguous. */
LOG((4, "allocating array of %d size_t to hold chunksizes for var %s",
var->ndims, var->name));
if (var->ndims)
if (!(var->chunksizes = calloc(var->ndims, sizeof(size_t))))
BAIL(NC_ENOMEM);
if ((retval = nc4_find_default_chunksizes2(grp, var)))
BAIL(retval);
/* Is this a variable with a chunksize greater than the current
* cache size? */
if ((retval = nc4_adjust_var_cache(grp, var)))
BAIL(retval);
/* If the user names this variable the same as a dimension, but
* doesn't use that dimension first in its list of dimension ids,
* is not a coordinate variable. I need to change its HDF5 name,
* because the dimension will cause a HDF5 dataset to be created,
* and this var has the same name. */
for (dim = grp->dim; dim; dim = dim->l.next)
if (dim->hash == var->hash && !strcmp(dim->name, norm_name) &&
(!var->ndims || dimidsp[0] != dim->dimid))
{
/* Set a different hdf5 name for this variable to avoid name
* clash. */
if (strlen(norm_name) + strlen(NON_COORD_PREPEND) > NC_MAX_NAME)
BAIL(NC_EMAXNAME);
if (!(var->hdf5_name = malloc((strlen(NON_COORD_PREPEND) +
strlen(norm_name) + 1) * sizeof(char))))
BAIL(NC_ENOMEM);
sprintf(var->hdf5_name, "%s%s", NON_COORD_PREPEND, norm_name);
}
/* If this is a coordinate var, it is marked as a HDF5 dimension
* scale. (We found dim above.) Otherwise, allocate space to
* remember whether dimension scales have been attached to each
* dimension. */
if (!var->dimscale && ndims)
if (ndims && !(var->dimscale_attached = calloc(ndims, sizeof(nc_bool_t))))
BAIL(NC_ENOMEM);
/* Return the varid. */
if (varidp)
*varidp = var->varid;
LOG((4, "new varid %d", var->varid));
exit:
if (type_info)
if ((retval = nc4_type_free(type_info)))
BAIL2(retval);
return retval;
}
/* Create a new variable to hold user data. This is what it's all
* about baby! */
int
NC4_def_var(int ncid, const char *name, nc_type xtype, int ndims,
const int *dimidsp, int *varidp)
{
NC *nc;
NC_HDF5_FILE_INFO_T *h5;
LOG((2, "%s: ncid 0x%x name %s xtype %d ndims %d",
__func__, ncid, name, xtype, ndims));
/* If there are dimensions, I need their ids. */
if (ndims && !dimidsp)
return NC_EINVAL;
/* Find metadata for this file. */
if (!(nc = nc4_find_nc_file(ncid,&h5)))
return NC_EBADID;
/* Handle netcdf-4 cases. */
return nc_def_var_nc4(ncid, name, xtype, ndims, dimidsp, varidp);
}
/* Get all the information about a variable. Pass NULL for whatever
* you don't care about. This is an internal function, not exposed to
* the user. */
int
NC4_inq_var_all(int ncid, int varid, char *name, nc_type *xtypep,
int *ndimsp, int *dimidsp, int *nattsp,
int *shufflep, int *deflatep, int *deflate_levelp,
int *fletcher32p, int *contiguousp, size_t *chunksizesp,
int *no_fill, void *fill_valuep, int *endiannessp,
int *options_maskp, int *pixels_per_blockp)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var;
NC_ATT_INFO_T *att;
int natts=0;
int d;
int retval;
LOG((2, "%s: ncid 0x%x varid %d", __func__, ncid, varid));
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
assert(nc);
assert(grp && h5);
/* Walk through the list of vars, and return the info about the one
with a matching varid. If the varid is -1, find the global
atts and call it a day. */
if (varid == NC_GLOBAL)
{
if (nattsp)
{
for (att = grp->att; att; att = att->l.next)
natts++;
*nattsp = natts;
}
return NC_NOERR;
}
/* Find the var. */
if (varid < 0 || varid >= grp->vars.nelems)
return NC_ENOTVAR;
var = grp->vars.value[varid];
if (!var) return NC_ENOTVAR;
assert(var->varid == varid);
/* Copy the data to the user's data buffers. */
if (name)
strcpy(name, var->name);
if (xtypep)
*xtypep = var->type_info->nc_typeid;
if (ndimsp)
*ndimsp = var->ndims;
if (dimidsp)
for (d = 0; d < var->ndims; d++)
dimidsp[d] = var->dimids[d];
if (nattsp)
{
for (att = var->att; att; att = att->l.next)
natts++;
*nattsp = natts;
}
/* Chunking stuff. */
if (!var->contiguous && chunksizesp)
for (d = 0; d < var->ndims; d++)
{
chunksizesp[d] = var->chunksizes[d];
LOG((4, "chunksizesp[%d]=%d", d, chunksizesp[d]));
}
if (contiguousp)
*contiguousp = var->contiguous ? NC_CONTIGUOUS : NC_CHUNKED;
/* Filter stuff. */
if (deflatep)
*deflatep = (int)var->deflate;
if (deflate_levelp)
*deflate_levelp = var->deflate_level;
if (shufflep)
*shufflep = (int)var->shuffle;
if (fletcher32p)
*fletcher32p = (int)var->fletcher32;
/* NOTE: No interface for returning szip flag currently (but it should never
* be set).
*/
if (options_maskp)
*options_maskp = var->options_mask;
if (pixels_per_blockp)
*pixels_per_blockp = var->pixels_per_block;
/* Fill value stuff. */
if (no_fill)
*no_fill = (int)var->no_fill;
/* Don't do a thing with fill_valuep if no_fill mode is set for
* this var, or if fill_valuep is NULL. */
if (!var->no_fill && fill_valuep)
{
/* Do we have a fill value for this var? */
if (var->fill_value)
{
if (var->type_info->nc_type_class == NC_STRING)
{
if (*(char **)var->fill_value) {
if (!(fill_valuep = calloc(1, sizeof(char *))))
return NC_ENOMEM;
if (!(*(char **)fill_valuep = strdup(*(char **)var->fill_value)))
{
free(fill_valuep);
return NC_ENOMEM;
}
}
}
else {
assert(var->type_info->size);
memcpy(fill_valuep, var->fill_value, var->type_info->size);
}
}
else
{
if (var->type_info->nc_type_class == NC_STRING)
{
if (!(fill_valuep = calloc(1, sizeof(char *))))
return NC_ENOMEM;
if ((retval = nc4_get_default_fill_value(var->type_info, (char **)fill_valuep)))
{
free(fill_valuep);
return retval;
} else {
free(fill_valuep);
}
}
else
{
if ((retval = nc4_get_default_fill_value(var->type_info, fill_valuep)))
return retval;
}
}
}
/* Does the user want the endianness of this variable? */
if (endiannessp)
*endiannessp = var->type_info->endianness;
return NC_NOERR;
}
/* This functions sets extra stuff about a netCDF-4 variable which
must be set before the enddef but after the def_var. This is an
internal function, deliberately hidden from the user so that we can
change the prototype of this functions without changing the API. */
static int
nc_def_var_extra(int ncid, int varid, int *shuffle, int *deflate,
int *deflate_level, int *fletcher32, int *contiguous,
const size_t *chunksizes, int *no_fill,
const void *fill_value, int *endianness)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var;
NC_DIM_INFO_T *dim;
int d;
int retval;
nc_bool_t ishdf4 = NC_FALSE; /* Use this to avoid so many ifdefs */
LOG((2, "%s: ncid 0x%x varid %d", __func__, ncid, varid));
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
#ifdef USE_HDF4
ishdf4 = h5->hdf4;
#endif
/* Attempting to do any of these things on a netCDF-3 file produces
* an error. */
if (!h5)
return NC_ENOTNC4;
assert(nc && grp && h5);
/* Find the var. */
if (varid < 0 || varid >= grp->vars.nelems)
return NC_ENOTVAR;
var = grp->vars.value[varid];
if (!var) return NC_ENOTVAR;
assert(var->varid == varid);
/* Can't turn on contiguous and deflate/fletcher32/szip. */
if (contiguous)
if ((*contiguous != NC_CHUNKED && deflate) ||
(*contiguous != NC_CHUNKED && fletcher32))
return NC_EINVAL;
/* Can't turn on parallel and deflate/fletcher32/szip/shuffle. */
if (nc->mode & (NC_MPIIO | NC_MPIPOSIX)) {
if (deflate || fletcher32 || shuffle)
return NC_EINVAL;
}
/* If the HDF5 dataset has already been created, then it is too
* late to set all the extra stuff. */
if (var->created)
return NC_ELATEDEF;
/* Check compression options. */
if (deflate && !deflate_level)
return NC_EINVAL;
/* Valid deflate level? */
if (deflate && deflate_level)
{
if (*deflate)
if (*deflate_level < MIN_DEFLATE_LEVEL ||
*deflate_level > MAX_DEFLATE_LEVEL)
return NC_EINVAL;
/* For scalars, just ignore attempt to deflate. */
if (!var->ndims)
return NC_NOERR;
/* Well, if we couldn't find any errors, I guess we have to take
* the users settings. Darn! */
var->contiguous = NC_FALSE;
var->deflate = *deflate;
if (*deflate)
var->deflate_level = *deflate_level;
LOG((3, "%s: *deflate_level %d", __func__, *deflate_level));
}
/* Shuffle filter? */
if (shuffle)
{
var->shuffle = *shuffle;
var->contiguous = NC_FALSE;
}
/* Fletcher32 checksum error protection? */
if (fletcher32)
{
var->fletcher32 = *fletcher32;
var->contiguous = NC_FALSE;
}
/* Does the user want a contiguous dataset? Not so fast! Make sure
* that there are no unlimited dimensions, and no filters in use
* for this data. */
if (contiguous && *contiguous)
{
if (var->deflate || var->fletcher32 || var->shuffle)
return NC_EINVAL;
if (!ishdf4) {
for (d = 0; d < var->ndims; d++)
{
dim = var->dim[d];
if (dim->unlimited)
return NC_EINVAL;
}
var->contiguous = NC_TRUE;
}
}
/* Chunksizes anyone? */
if (!ishdf4 && contiguous && *contiguous == NC_CHUNKED)
{
var->contiguous = NC_FALSE;
/* If the user provided chunksizes, check that they are not too
* big, and that their total size of chunk is less than 4 GB. */
if (chunksizes)
{
if ((retval = check_chunksizes(grp, var, chunksizes)))
return retval;
for (d = 0; d < var->ndims; d++) {
if(var->dim[d]->len > 0 && chunksizes[d] > var->dim[d]->len)
return NC_EBADCHUNK;
}
/* Set the chunksizes for this variable. */
for (d = 0; d < var->ndims; d++)
var->chunksizes[d] = chunksizes[d];
}
}
/* Is this a variable with a chunksize greater than the current
* cache size? */
if (!var->contiguous && (chunksizes || deflate || contiguous))
{
/* Determine default chunksizes for this variable. */
if (!var->chunksizes[0])
if ((retval = nc4_find_default_chunksizes2(grp, var)))
return retval;
/* Adjust the cache. */
if ((retval = nc4_adjust_var_cache(grp, var)))
return retval;
}
/* Are we setting a fill modes? */
if (no_fill)
{
if (*no_fill)
var->no_fill = NC_TRUE;
else
var->no_fill = NC_FALSE;
}
/* Are we setting a fill value? */
if (fill_value && !var->no_fill)
{
/* Copy the fill_value. */
LOG((4, "Copying fill value into metadata for variable %s",
var->name));
/* If there's a _FillValue attribute, delete it. */
retval = NC4_del_att(ncid, varid, _FillValue);
if (retval && retval != NC_ENOTATT)
return retval;
/* Create a _FillValue attribute. */
if ((retval = nc_put_att(ncid, varid, _FillValue, var->type_info->nc_typeid, 1, fill_value)))
return retval;
}
/* Is the user setting the endianness? */
if (endianness)
var->type_info->endianness = *endianness;
return NC_NOERR;
}
/* Set the deflate level for a var, lower is faster, higher is
* better. Must be called after nc_def_var and before nc_enddef or any
* functions which writes data to the file. */
int
NC4_def_var_deflate(int ncid, int varid, int shuffle, int deflate,
int deflate_level)
{
return nc_def_var_extra(ncid, varid, &shuffle, &deflate,
&deflate_level, NULL, NULL, NULL, NULL, NULL, NULL);
}
/* Set checksum for a var. This must be called after the nc_def_var
* but before the nc_enddef. */
int
NC4_def_var_fletcher32(int ncid, int varid, int fletcher32)
{
return nc_def_var_extra(ncid, varid, NULL, NULL, NULL, &fletcher32,
NULL, NULL, NULL, NULL, NULL);
}
/* Define chunking stuff for a var. This must be done after nc_def_var
and before nc_enddef.
Chunking is required in any dataset with one or more unlimited
dimensions in HDF5, or any dataset using a filter.
Where chunksize is a pointer to an array of size ndims, with the
chunksize in each dimension.
*/
int
NC4_def_var_chunking(int ncid, int varid, int contiguous, const size_t *chunksizesp)
{
return nc_def_var_extra(ncid, varid, NULL, NULL, NULL, NULL,
&contiguous, chunksizesp, NULL, NULL, NULL);
}
/* Inquire about chunking stuff for a var. This is a private,
* undocumented function, used by the f77 API to avoid size_t
* problems. */
int
nc_inq_var_chunking_ints(int ncid, int varid, int *contiguousp, int *chunksizesp)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_VAR_INFO_T *var;
NC_HDF5_FILE_INFO_T *h5;
size_t *cs = NULL;
int i, retval;
/* Find this ncid's file info. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
assert(nc);
/* Find var cause I need the number of dims. */
if ((retval = nc4_find_g_var_nc(nc, ncid, varid, &grp, &var)))
return retval;
/* Allocate space for the size_t copy of the chunksizes array. */
if (var->ndims)
if (!(cs = malloc(var->ndims * sizeof(size_t))))
return NC_ENOMEM;
retval = NC4_inq_var_all(ncid, varid, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, contiguousp, cs, NULL,
NULL, NULL, NULL, NULL);
/* Copy from size_t array. */
if (*contiguousp == NC_CHUNKED)
for (i = 0; i < var->ndims; i++)
{
chunksizesp[i] = (int)cs[i];
if (cs[i] > NC_MAX_INT)
retval = NC_ERANGE;
}
if (var->ndims)
free(cs);
return retval;
}
/* This function defines the chunking with ints, which works better
* with F77 portability. It is a secret function, which has been
* rendered unmappable, and it is impossible to apparate anywhere in
* this function. */
int
nc_def_var_chunking_ints(int ncid, int varid, int contiguous, int *chunksizesp)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_VAR_INFO_T *var;
NC_HDF5_FILE_INFO_T *h5;
size_t *cs = NULL;
int i, retval;
/* Find this ncid's file info. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
assert(nc);
#ifdef USE_HDF4
if(h5->hdf4)
return NC_NOERR;
#endif
/* Find var cause I need the number of dims. */
if ((retval = nc4_find_g_var_nc(nc, ncid, varid, &grp, &var)))
return retval;
/* Allocate space for the size_t copy of the chunksizes array. */
if (var->ndims)
if (!(cs = malloc(var->ndims * sizeof(size_t))))
return NC_ENOMEM;
/* Copy to size_t array. */
for (i = 0; i < var->ndims; i++)
cs[i] = chunksizesp[i];
retval = nc_def_var_extra(ncid, varid, NULL, NULL, NULL, NULL,
&contiguous, cs, NULL, NULL, NULL);
if (var->ndims)
free(cs);
return retval;
}
/* Define fill value behavior for a variable. This must be done after
nc_def_var and before nc_enddef. */
int
NC4_def_var_fill(int ncid, int varid, int no_fill, const void *fill_value)
{
return nc_def_var_extra(ncid, varid, NULL, NULL, NULL, NULL, NULL,
NULL, &no_fill, fill_value, NULL);
}
/* Define the endianness of a variable. */
int
NC4_def_var_endian(int ncid, int varid, int endianness)
{
return nc_def_var_extra(ncid, varid, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, &endianness);
}
/* Get var id from name. */
int
NC4_inq_varid(int ncid, const char *name, int *varidp)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_VAR_INFO_T *var;
char norm_name[NC_MAX_NAME + 1];
int retval;
uint32_t nn_hash;
if (!name)
return NC_EINVAL;
if (!varidp)
return NC_NOERR;
LOG((2, "%s: ncid 0x%x name %s", __func__, ncid, name));
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, NULL)))
return retval;
/* Normalize name. */
if ((retval = nc4_normalize_name(name, norm_name)))
return retval;
nn_hash = hash_fast(norm_name, strlen(norm_name));
/* Find var of this name. */
for (int i=0; i < grp->vars.nelems; i++)
{
var = grp->vars.value[i];
if (!var) continue;
if (nn_hash == var->hash && !(strcmp(var->name, norm_name)))
{
*varidp = var->varid;
return NC_NOERR;
}
}
return NC_ENOTVAR;
}
/* Rename a var to "bubba," for example.
According to the netcdf-3.5 docs: If the new name is longer than
the old name, the netCDF dataset must be in define mode. */
int
NC4_rename_var(int ncid, int varid, const char *name)
{
NC *nc;
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var, *tmp_var;
uint32_t nn_hash;
int retval = NC_NOERR;
LOG((2, "%s: ncid 0x%x varid %d name %s",
__func__, ncid, varid, name));
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
assert(h5);
/* Is the new name too long? */
if (strlen(name) > NC_MAX_NAME)
return NC_EMAXNAME;
/* Trying to write to a read-only file? No way, Jose! */
if (h5->no_write)
return NC_EPERM;
/* Check name validity, if strict nc3 rules are in effect for this
* file. */
if ((retval = NC_check_name(name)))
return retval;
/* Check if name is in use, and retain a pointer to the correct variable */
nn_hash = hash_fast(name, strlen(name));
tmp_var = NULL;
for (int i=0; i < grp->vars.nelems; i++)
{
var = grp->vars.value[i];
if (!var) continue;
if (nn_hash == var->hash && !strncmp(var->name, name, NC_MAX_NAME))
return NC_ENAMEINUSE;
if (var->varid == varid)
tmp_var = var;
}
if (!tmp_var)
return NC_ENOTVAR;
var = tmp_var;
/* If we're not in define mode, new name must be of equal or
less size, if strict nc3 rules are in effect for this . */
if (!(h5->flags & NC_INDEF) && strlen(name) > strlen(var->name) &&
(h5->cmode & NC_CLASSIC_MODEL))
return NC_ENOTINDEFINE;
/* Change the HDF5 file, if this var has already been created
there. */
if (var->created)
{
if (H5Gmove(grp->hdf_grpid, var->name, name) < 0)
BAIL(NC_EHDFERR);
}
/* Now change the name in our metadata. */
free(var->name);
if (!(var->name = malloc((strlen(name) + 1) * sizeof(char))))
return NC_ENOMEM;
strcpy(var->name, name);
var->hash = nn_hash;
/* Check if this was a coordinate variable previously, but names are different now */
if (var->dimscale && strcmp(var->name, var->dim[0]->name))
{
/* Break up the coordinate variable */
if ((retval = nc4_break_coord_var(grp, var, var->dim[0])))
return retval;
}
/* Check if this should become a coordinate variable */
if (!var->dimscale)
{
/* Only variables with >0 dimensions can become coordinate variables */
if (var->ndims)
{
NC_GRP_INFO_T *dim_grp;
NC_DIM_INFO_T *dim;
/* Check to see if this is became a coordinate variable. If so, it
* will have the same name as dimension index 0. If it is a
* coordinate var, is it a coordinate var in the same group as the dim?
*/
if ((retval = nc4_find_dim(grp, var->dimids[0], &dim, &dim_grp)))
return retval;
if (strcmp(dim->name, name) == 0 && dim_grp == grp)
{
/* Reform the coordinate variable */
if ((retval = nc4_reform_coord_var(grp, var, dim)))
return retval;
}
}
}
exit:
return retval;
}
int
NC4_var_par_access(int ncid, int varid, int par_access)
{
#ifndef USE_PARALLEL4
return NC_ENOPAR;
#else
NC *nc;
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var;
int retval;
LOG((1, "%s: ncid 0x%x varid %d par_access %d", __func__, ncid,
varid, par_access));
if (par_access != NC_INDEPENDENT && par_access != NC_COLLECTIVE)
return NC_EINVAL;
/* Find info for this file and group, and set pointer to each. */
if ((retval = nc4_find_nc_grp_h5(ncid, &nc, &grp, &h5)))
return retval;
/* This function only for files opened with nc_open_par or nc_create_par. */
if (!h5->parallel)
return NC_ENOPAR;
/* Find the var, and set its preference. */
if (varid < 0 || varid >= grp->vars.nelems)
return NC_ENOTVAR;
var = grp->vars.value[varid];
if (!var) return NC_ENOTVAR;
assert(var->varid == varid);
if (par_access)
var->parallel_access = NC_COLLECTIVE;
else
var->parallel_access = NC_INDEPENDENT;
return NC_NOERR;
#endif /* USE_PARALLEL4 */
}
static int
nc4_put_vara_tc(int ncid, int varid, nc_type mem_type, int mem_type_is_long,
const size_t *startp, const size_t *countp, const void *op)
{
NC *nc;
LOG((2, "%s: ncid 0x%x varid %d mem_type %d mem_type_is_long %d",
__func__, ncid, varid, mem_type, mem_type_is_long));
if (!(nc = nc4_find_nc_file(ncid,NULL)))
return NC_EBADID;
return nc4_put_vara(nc, ncid, varid, startp, countp, mem_type,
mem_type_is_long, (void *)op);
}
#ifdef USE_HDF4
static int
nc4_get_hdf4_vara(NC *nc, int ncid, int varid, const size_t *startp,
const size_t *countp, nc_type mem_nc_type, int is_long, void *data)
{
NC_GRP_INFO_T *grp;
NC_HDF5_FILE_INFO_T *h5;
NC_VAR_INFO_T *var;
int32 start32[NC_MAX_VAR_DIMS], edge32[NC_MAX_VAR_DIMS];
int retval, d;
/* Find our metadata for this file, group, and var. */
assert(nc);
if ((retval = nc4_find_g_var_nc(nc, ncid, varid, &grp, &var)))
return retval;
h5 = NC4_DATA(nc);
assert(grp && h5 && var && var->name);
for (d = 0; d < var->ndims; d++)
{
start32[d] = startp[d];
edge32[d] = countp[d];
}
if (SDreaddata(var->sdsid, start32, NULL, edge32, data))
return NC_EHDFERR;
return NC_NOERR;
}
#endif /* USE_HDF4 */
/* Get an array. */
static int
nc4_get_vara_tc(int ncid, int varid, nc_type mem_type, int mem_type_is_long,
const size_t *startp, const size_t *countp, void *ip)
{
NC *nc;
NC_HDF5_FILE_INFO_T* h5;
LOG((2, "%s: ncid 0x%x varid %d mem_type %d mem_type_is_long %d",
__func__, ncid, varid, mem_type, mem_type_is_long));
if (!(nc = nc4_find_nc_file(ncid,&h5)))
return NC_EBADID;
#ifdef USE_HDF4
/* Handle HDF4 cases. */
if (h5->hdf4)
return nc4_get_hdf4_vara(nc, ncid, varid, startp, countp, mem_type,
mem_type_is_long, (void *)ip);
#endif /* USE_HDF4 */
/* Handle HDF5 cases. */
return nc4_get_vara(nc, ncid, varid, startp, countp, mem_type,
mem_type_is_long, (void *)ip);
}
int
NC4_put_vara(int ncid, int varid, const size_t *startp,
const size_t *countp, const void *op, int memtype)
{
return nc4_put_vara_tc(ncid, varid, memtype, 0, startp, countp, op);
}
/* Read an array of values. */
int
NC4_get_vara(int ncid, int varid, const size_t *startp,
const size_t *countp, void *ip, int memtype)
{
return nc4_get_vara_tc(ncid, varid, memtype, 0, startp, countp, ip);
}
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