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netcdf-c/libhdf5/nc4hdf.c
Edward Hartnett 4e4209b6f0 code and documentation cleanup
2022-07-02 08:13:13 -06:00

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/* Copyright 2018, University Corporation for Atmospheric
* Research. See the COPYRIGHT file for copying and redistribution
* conditions. */
/**
* @file
* @internal 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 contains functions internal to the netcdf4 library. None of
* the functions in this file are exposed in the exetnal API. These
* functions handle the HDF interface.
*
* @author Ed Hartnett, Dennis Heimbigner, Ward Fisher
*/
#include "config.h"
#include "netcdf.h"
#include "nc4internal.h"
#include "ncdispatch.h"
#include "hdf5internal.h"
#include "hdf5err.h" /* For BAIL2 */
#include "hdf5debug.h"
#include <math.h>
#ifdef HAVE_INTTYPES_H
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#endif
#define NC_HDF5_MAX_NAME 1024 /**< @internal Max size of HDF5 name. */
/**
* @internal Flag attributes in a linked list as dirty.
*
* @param attlist List of attributes, may be NULL.
*
* @return NC_NOERR No error.
* @author Dennis Heimbigner
*/
static int
flag_atts_dirty(NCindex *attlist) {
NC_ATT_INFO_T *att = NULL;
int i;
if(attlist == NULL) {
return NC_NOERR;
}
for(i=0;i<ncindexsize(attlist);i++) {
att = (NC_ATT_INFO_T*)ncindexith(attlist,i);
if(att == NULL) continue;
att->dirty = NC_TRUE;
}
return NC_NOERR;
}
/**
* @internal This function is needed to handle one special case: what
* if the user defines a dim, writes metadata, then goes back into
* define mode and adds a coordinate var for the already existing
* dim. In that case, I need to recreate the dim's dimension scale
* dataset, and then I need to go to every var in the file which uses
* that dimension, and attach the new dimension scale.
*
* @param grp Pointer to group info struct.
* @param dimid Dimension ID.
* @param dimscaleid HDF5 dimension scale ID.
*
* @returns NC_NOERR No error.
* @returns NC_EDIMSCALE HDF5 returned an error when trying to reattach a dimension scale.
* @author Ed Hartnett
*/
int
rec_reattach_scales(NC_GRP_INFO_T *grp, int dimid, hid_t dimscaleid)
{
NC_VAR_INFO_T *var;
NC_GRP_INFO_T *child_grp;
int d, i;
int retval;
assert(grp && grp->hdr.name && dimid >= 0 && dimscaleid >= 0);
LOG((3, "%s: grp->hdr.name %s", __func__, grp->hdr.name));
/* If there are any child groups, attach dimscale there, if needed. */
for (i = 0; i < ncindexsize(grp->children); i++)
{
child_grp = (NC_GRP_INFO_T*)ncindexith(grp->children, i);
assert(child_grp);
if ((retval = rec_reattach_scales(child_grp, dimid, dimscaleid)))
return retval;
}
/* Find any vars that use this dimension id. */
for (i = 0; i < ncindexsize(grp->vars); i++)
{
NC_HDF5_VAR_INFO_T *hdf5_var;
var = (NC_VAR_INFO_T*)ncindexith(grp->vars,i);
assert(var && var->format_var_info);
hdf5_var = (NC_HDF5_VAR_INFO_T*)var->format_var_info;
assert(hdf5_var != NULL);
for (d = 0; d < var->ndims; d++)
{
if (var->dimids[d] == dimid && !hdf5_var->dimscale)
{
LOG((2, "%s: attaching scale for dimid %d to var %s",
__func__, var->dimids[d], var->hdr.name));
if (var->created)
{
if (H5DSattach_scale(hdf5_var->hdf_datasetid,
dimscaleid, d) < 0)
return NC_EDIMSCALE;
hdf5_var->dimscale_attached[d] = NC_TRUE;
}
}
}
}
return NC_NOERR;
}
/**
* @internal This function is needed to handle one special case: what
* if the user defines a dim, writes metadata, then goes back into
* define mode and adds a coordinate var for the already existing
* dim. In that case, I need to recreate the dim's dimension scale
* dataset, and then I need to go to every var in the file which uses
* that dimension, and attach the new dimension scale.
*
* @param grp Pointer to group info struct.
* @param dimid Dimension ID.
* @param dimscaleid HDF5 dimension scale ID.
*
* @returns NC_NOERR No error.
* @returns NC_EDIMSCALE HDF5 returned an error when trying to detach a dimension scale.
* @author Ed Hartnett
*/
int
rec_detach_scales(NC_GRP_INFO_T *grp, int dimid, hid_t dimscaleid)
{
NC_VAR_INFO_T *var;
NC_GRP_INFO_T *child_grp;
int d, i;
int retval;
assert(grp && grp->hdr.name && dimid >= 0 && dimscaleid >= 0);
LOG((3, "%s: grp->hdr.name %s", __func__, grp->hdr.name));
/* If there are any child groups, detach dimscale there, if needed. */
for(i=0;i<ncindexsize(grp->children);i++) {
child_grp = (NC_GRP_INFO_T*)ncindexith(grp->children,i);
if(child_grp == NULL) continue;
if ((retval = rec_detach_scales(child_grp, dimid, dimscaleid)))
return retval;
}
/* Find any vars that use this dimension id. */
for (i = 0; i < ncindexsize(grp->vars); i++)
{
NC_HDF5_VAR_INFO_T *hdf5_var;
var = (NC_VAR_INFO_T*)ncindexith(grp->vars, i);
assert(var && var->format_var_info);
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
for (d = 0; d < var->ndims; d++)
{
if (var->dimids[d] == dimid && !hdf5_var->dimscale)
{
LOG((2, "%s: detaching scale for dimid %d to var %s",
__func__, var->dimids[d], var->hdr.name));
if (var->created)
{
if (hdf5_var->dimscale_attached && hdf5_var->dimscale_attached[d])
{
if (H5DSdetach_scale(hdf5_var->hdf_datasetid,
dimscaleid, d) < 0)
return NC_EDIMSCALE;
hdf5_var->dimscale_attached[d] = NC_FALSE;
}
}
}
}
}
return NC_NOERR;
}
/**
* @internal Open a HDF5 dataset and leave it open.
*
* @param grp Pointer to group info struct.
* @param varid Variable ID.
* @param dataset Pointer that gets the HDF5 dataset ID.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
int
nc4_open_var_grp2(NC_GRP_INFO_T *grp, int varid, hid_t *dataset)
{
NC_VAR_INFO_T *var;
NC_HDF5_VAR_INFO_T *hdf5_var;
assert(grp && grp->format_grp_info && dataset);
/* Find the requested varid. */
if (!(var = (NC_VAR_INFO_T *)ncindexith(grp->vars, varid)))
return NC_ENOTVAR;
assert(var && var->hdr.id == varid && var->format_var_info);
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* Open this dataset if necessary. */
if (!hdf5_var->hdf_datasetid)
{
NC_HDF5_GRP_INFO_T *hdf5_grp;
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
if ((hdf5_var->hdf_datasetid = H5Dopen2(hdf5_grp->hdf_grpid,
var->hdr.name, H5P_DEFAULT)) < 0)
return NC_ENOTVAR;
}
*dataset = hdf5_var->hdf_datasetid;
return NC_NOERR;
}
/**
* @internal Given a netcdf type, return appropriate HDF typeid. (All
* hdf_typeid's returned from this routine must be H5Tclosed by the
* caller).
*
* @param h5 Pointer to HDF5 file info struct.
* @param xtype NetCDF type ID.
* @param hdf_typeid Pointer that gets the HDF5 type ID.
* @param endianness Desired endianness in HDF5 type.
*
* @return NC_NOERR No error.
* @return NC_ECHAR Conversions of NC_CHAR forbidden.
* @return NC_EVARMETA HDF5 returning error creating datatype.
* @return NC_EHDFERR HDF5 returning error.
* @return NC_EBADTYE Type not found.
* @author Ed Hartnett
*/
int
nc4_get_hdf_typeid(NC_FILE_INFO_T *h5, nc_type xtype,
hid_t *hdf_typeid, int endianness)
{
NC_TYPE_INFO_T *type;
hid_t typeid = 0;
int retval = NC_NOERR;
assert(hdf_typeid && h5);
*hdf_typeid = -1;
/* Determine an appropriate HDF5 datatype */
if (xtype == NC_NAT)
return NC_EBADTYPE;
else if (xtype == NC_CHAR || xtype == NC_STRING)
{
/* NC_CHAR & NC_STRING types create a new HDF5 datatype */
if (xtype == NC_CHAR)
{
if ((typeid = H5Tcopy(H5T_C_S1)) < 0)
return NC_EHDFERR;
if (H5Tset_strpad(typeid, H5T_STR_NULLTERM) < 0)
BAIL(NC_EVARMETA);
if(H5Tset_cset(typeid, H5T_CSET_ASCII) < 0)
BAIL(NC_EVARMETA);
/* Take ownership of the newly created HDF5 datatype */
*hdf_typeid = typeid;
typeid = 0;
}
else
{
if ((typeid = H5Tcopy(H5T_C_S1)) < 0)
return NC_EHDFERR;
if (H5Tset_size(typeid, H5T_VARIABLE) < 0)
BAIL(NC_EVARMETA);
if(H5Tset_cset(typeid, H5T_CSET_UTF8) < 0)
BAIL(NC_EVARMETA);
/* Take ownership of the newly created HDF5 datatype */
*hdf_typeid = typeid;
typeid = 0;
}
}
else
{
/* All other types use an existing HDF5 datatype */
switch (xtype)
{
case NC_BYTE: /* signed 1 byte integer */
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_I8LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_I8BE;
else
typeid = H5T_NATIVE_SCHAR;
break;
case NC_SHORT: /* signed 2 byte integer */
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_I16LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_I16BE;
else
typeid = H5T_NATIVE_SHORT;
break;
case NC_INT:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_I32LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_I32BE;
else
typeid = H5T_NATIVE_INT;
break;
case NC_UBYTE:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_U8LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_U8BE;
else
typeid = H5T_NATIVE_UCHAR;
break;
case NC_USHORT:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_U16LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_U16BE;
else
typeid = H5T_NATIVE_USHORT;
break;
case NC_UINT:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_U32LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_U32BE;
else
typeid = H5T_NATIVE_UINT;
break;
case NC_INT64:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_I64LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_I64BE;
else
typeid = H5T_NATIVE_LLONG;
break;
case NC_UINT64:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_STD_U64LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_STD_U64BE;
else
typeid = H5T_NATIVE_ULLONG;
break;
case NC_FLOAT:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_IEEE_F32LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_IEEE_F32BE;
else
typeid = H5T_NATIVE_FLOAT;
break;
case NC_DOUBLE:
if (endianness == NC_ENDIAN_LITTLE)
typeid = H5T_IEEE_F64LE;
else if (endianness == NC_ENDIAN_BIG)
typeid = H5T_IEEE_F64BE;
else
typeid = H5T_NATIVE_DOUBLE;
break;
default:
/* Maybe this is a user defined type? */
if (nc4_find_type(h5, xtype, &type))
return NC_EBADTYPE;
if (!type)
return NC_EBADTYPE;
typeid = ((NC_HDF5_TYPE_INFO_T *)type->format_type_info)->hdf_typeid;
break;
}
assert(typeid);
/* Copy the HDF5 datatype, so the function operates uniformly */
if ((*hdf_typeid = H5Tcopy(typeid)) < 0)
return NC_EHDFERR;
typeid = 0;
}
assert(*hdf_typeid != -1);
exit:
if (typeid > 0 && H5Tclose(typeid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal Write an attribute.
*
* @param grp Pointer to group info struct.
* @param varid Variable ID or NC_GLOBAL.
* @param att Pointer to attribute info struct.
*
* @returns ::NC_NOERR No error.
* @returns ::NC_ENOTVAR Variable not found.
* @returns ::NC_EPERM Read-only file.
* @returns ::NC_EHDFERR HDF5 returned error.
* @returns ::NC_EATTMETA HDF5 returned error with attribute calls.
* @author Ed Hartnett
*/
static int
put_att_grpa(NC_GRP_INFO_T *grp, int varid, NC_ATT_INFO_T *att)
{
NC_HDF5_GRP_INFO_T *hdf5_grp;
hid_t datasetid = 0, locid;
hid_t attid = 0, spaceid = 0, file_typeid = 0;
hid_t existing_att_typeid = 0, existing_attid = 0, existing_spaceid = 0;
hsize_t dims[1]; /* netcdf attributes always 1-D. */
htri_t attr_exists;
void *data;
int phoney_data = 99;
int retval = NC_NOERR;
assert(att->hdr.name && grp && grp->format_grp_info);
LOG((3, "%s: varid %d att->hdr.id %d att->hdr.name %s att->nc_typeid %d "
"att->len %d", __func__, varid, att->hdr.id, att->hdr.name,
att->nc_typeid, att->len));
/* Get HDF5-specific group info. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
/* If the file is read-only, return an error. */
if (grp->nc4_info->no_write)
BAIL(NC_EPERM);
/* Get the hid to attach the attribute to, or read it from. */
if (varid == NC_GLOBAL)
locid = hdf5_grp->hdf_grpid;
else
{
if ((retval = nc4_open_var_grp2(grp, varid, &datasetid)))
BAIL(retval);
locid = datasetid;
}
/* Get the length ready, and find the HDF type we'll be
* writing. */
dims[0] = att->len;
if ((retval = nc4_get_hdf_typeid(grp->nc4_info, att->nc_typeid,
&file_typeid, 0)))
BAIL(retval);
/* Even if the length is zero, HDF5 won't let me write with a
* NULL pointer. So if the length of the att is zero, point to
* some phoney data (which won't be written anyway.)*/
if (!dims[0])
data = &phoney_data;
#ifdef SEPDATA
else if (att->vldata)
data = att->vldata;
else if (att->stdata)
data = att->stdata;
#endif
else
data = att->data;
/* NC_CHAR types require some extra work. The space ID is set to
* scalar, and the type is told how long the string is. If it's
* really zero length, set the size to 1. (The fact that it's
* really zero will be marked by the NULL dataspace, but HDF5
* doesn't allow me to set the size of the type to zero.)*/
if (att->nc_typeid == NC_CHAR)
{
size_t string_size = dims[0];
if (!string_size)
{
string_size = 1;
if ((spaceid = H5Screate(H5S_NULL)) < 0)
BAIL(NC_EATTMETA);
}
else
{
if ((spaceid = H5Screate(H5S_SCALAR)) < 0)
BAIL(NC_EATTMETA);
}
if (H5Tset_size(file_typeid, string_size) < 0)
BAIL(NC_EATTMETA);
if (H5Tset_strpad(file_typeid, H5T_STR_NULLTERM) < 0)
BAIL(NC_EATTMETA);
}
else
{
if (!att->len)
{
if ((spaceid = H5Screate(H5S_NULL)) < 0)
BAIL(NC_EATTMETA);
}
else
{
if ((spaceid = H5Screate_simple(1, dims, NULL)) < 0)
BAIL(NC_EATTMETA);
}
}
/* Does the att exists already? */
if ((attr_exists = H5Aexists(locid, att->hdr.name)) < 0)
BAIL(NC_EHDFERR);
if (attr_exists)
{
hssize_t npoints;
/* Open the attribute. */
if ((existing_attid = H5Aopen(locid, att->hdr.name, H5P_DEFAULT)) < 0)
BAIL(NC_EATTMETA);
/* Find the type of the existing attribute. */
if ((existing_att_typeid = H5Aget_type(existing_attid)) < 0)
BAIL(NC_EATTMETA);
/* How big is the attribute? */
if ((existing_spaceid = H5Aget_space(existing_attid)) < 0)
BAIL(NC_EATTMETA);
if ((npoints = H5Sget_simple_extent_npoints(existing_spaceid)) < 0)
BAIL(NC_EATTMETA);
/* For text attributes the size is specified in the datatype
and it is enough to compare types using H5Tequal(). */
if (!H5Tequal(file_typeid, existing_att_typeid) ||
(att->nc_typeid != NC_CHAR && npoints != att->len))
{
/* The attribute exists but we cannot re-use it. */
/* Delete the attribute. */
if (H5Adelete(locid, att->hdr.name) < 0)
BAIL(NC_EHDFERR);
/* Re-create the attribute with the type and length
reflecting the new value (or values). */
if ((attid = H5Acreate1(locid, att->hdr.name, file_typeid, spaceid,
H5P_DEFAULT)) < 0)
BAIL(NC_EATTMETA);
/* Write the values, (even if length is zero). */
if (H5Awrite(attid, file_typeid, data) < 0)
BAIL(NC_EATTMETA);
}
else
{
/* The attribute exists and we can re-use it. */
/* Write the values, re-using the existing attribute. */
if (H5Awrite(existing_attid, file_typeid, data) < 0)
BAIL(NC_EATTMETA);
}
}
else
{
/* The attribute does not exist yet. */
/* Create the attribute. */
if ((attid = H5Acreate1(locid, att->hdr.name, file_typeid, spaceid,
H5P_DEFAULT)) < 0)
BAIL(NC_EATTMETA);
/* Write the values, (even if length is zero). */
if (H5Awrite(attid, file_typeid, data) < 0)
BAIL(NC_EATTMETA);
}
exit:
if (file_typeid && H5Tclose(file_typeid))
BAIL2(NC_EHDFERR);
if (attid > 0 && H5Aclose(attid) < 0)
BAIL2(NC_EHDFERR);
if (existing_att_typeid && H5Tclose(existing_att_typeid))
BAIL2(NC_EHDFERR);
if (existing_attid > 0 && H5Aclose(existing_attid) < 0)
BAIL2(NC_EHDFERR);
if (spaceid > 0 && H5Sclose(spaceid) < 0)
BAIL2(NC_EHDFERR);
if (existing_spaceid > 0 && H5Sclose(existing_spaceid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal Write all the dirty atts in an attlist.
*
* @param attlist Pointer to the list if attributes.
* @param varid Variable ID.
* @param grp Pointer to group info struct.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
static int
write_attlist(NCindex *attlist, int varid, NC_GRP_INFO_T *grp)
{
NC_ATT_INFO_T *att;
int retval;
int i;
for(i = 0; i < ncindexsize(attlist); i++)
{
att = (NC_ATT_INFO_T *)ncindexith(attlist, i);
assert(att);
if (att->dirty)
{
LOG((4, "%s: writing att %s to varid %d", __func__, att->hdr.name, varid));
if ((retval = put_att_grpa(grp, varid, att)))
return retval;
att->dirty = NC_FALSE;
att->created = NC_TRUE;
}
}
return NC_NOERR;
}
/**
* @internal HDF5 dimension scales cannot themselves have scales
* attached. This is a problem for multidimensional coordinate
* variables. So this function writes a special attribute for such a
* variable, which has the ids of all the dimensions for that
* coordinate variable.
*
* @param var Pointer to var info struct.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
static int
write_coord_dimids(NC_VAR_INFO_T *var)
{
NC_HDF5_VAR_INFO_T *hdf5_var;
hsize_t coords_len[1];
hid_t c_spaceid = -1, c_attid = -1;
int retval = NC_NOERR;
assert(var && var->format_var_info);
/* Get HDF5-specific var info. */
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* Set up space for attribute. */
coords_len[0] = var->ndims;
if ((c_spaceid = H5Screate_simple(1, coords_len, coords_len)) < 0)
BAIL(NC_EHDFERR);
/* Create the attribute. */
if ((c_attid = H5Acreate1(hdf5_var->hdf_datasetid, COORDINATES,
H5T_NATIVE_INT, c_spaceid, H5P_DEFAULT)) < 0)
BAIL(NC_EHDFERR);
/* Write our attribute. */
if (H5Awrite(c_attid, H5T_NATIVE_INT, var->dimids) < 0)
BAIL(NC_EHDFERR);
exit:
if (c_spaceid >= 0 && H5Sclose(c_spaceid) < 0)
BAIL2(NC_EHDFERR);
if (c_attid >= 0 && H5Aclose(c_attid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal When nc_def_var_quantize() is used, a new attribute is
* added to the var, containing the quantize information.
*
* @param var Pointer to var info struct.
* @param att_name Name of the qunatize attribute.
* @param nsd Number of significant digits.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
static int
write_quantize_att(NC_VAR_INFO_T *var)
{
NC_HDF5_VAR_INFO_T *hdf5_var;
hsize_t len = 1;
hid_t c_spaceid = -1, c_attid = -1;
char att_name[NC_MAX_NAME + 1];
int retval = NC_NOERR;
assert(var && var->format_var_info);
/* Get HDF5-specific var info. */
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* Different quantize algorithms get different attribute names. */
switch (var->quantize_mode)
{
case NC_QUANTIZE_BITGROOM:
sprintf(att_name, "%s", NC_QUANTIZE_BITGROOM_ATT_NAME);
break;
case NC_QUANTIZE_GRANULARBR:
sprintf(att_name, "%s", NC_QUANTIZE_GRANULARBR_ATT_NAME);
break;
case NC_QUANTIZE_BITROUND:
sprintf(att_name, "%s", NC_QUANTIZE_BITROUND_ATT_NAME);
break;
default:
return NC_EINVAL;
}
/* Set up space for attribute. */
if ((c_spaceid = H5Screate_simple(1, &len, &len)) < 0)
BAIL(NC_EHDFERR);
/* Create the attribute. */
if ((c_attid = H5Acreate1(hdf5_var->hdf_datasetid, att_name,
H5T_NATIVE_INT, c_spaceid, H5P_DEFAULT)) < 0)
BAIL(NC_EHDFERR);
/* Write our attribute. */
if (H5Awrite(c_attid, H5T_NATIVE_INT, &var->nsd) < 0)
BAIL(NC_EHDFERR);
exit:
if (c_spaceid >= 0 && H5Sclose(c_spaceid) < 0)
BAIL2(NC_EHDFERR);
if (c_attid >= 0 && H5Aclose(c_attid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal Write a special attribute for the netCDF-4 dimension ID.
*
* @param datasetid HDF5 datasset ID.
* @param dimid NetCDF dimension ID.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
static int
write_netcdf4_dimid(hid_t datasetid, int dimid)
{
hid_t dimid_spaceid = -1, dimid_attid = -1;
htri_t attr_exists;
int retval = NC_NOERR;
/* Create the space. */
if ((dimid_spaceid = H5Screate(H5S_SCALAR)) < 0)
BAIL(NC_EHDFERR);
/* Does the attribute already exist? If so, don't try to create it. */
if ((attr_exists = H5Aexists(datasetid, NC_DIMID_ATT_NAME)) < 0)
BAIL(NC_EHDFERR);
if (attr_exists)
dimid_attid = H5Aopen_by_name(datasetid, ".", NC_DIMID_ATT_NAME,
H5P_DEFAULT, H5P_DEFAULT);
else
/* Create the attribute if needed. */
dimid_attid = H5Acreate1(datasetid, NC_DIMID_ATT_NAME,
H5T_NATIVE_INT, dimid_spaceid, H5P_DEFAULT);
if (dimid_attid < 0)
BAIL(NC_EHDFERR);
/* Write it. */
LOG((4, "%s: writing secret dimid %d", __func__, dimid));
if (H5Awrite(dimid_attid, H5T_NATIVE_INT, &dimid) < 0)
BAIL(NC_EHDFERR);
exit:
/* Close stuff*/
if (dimid_spaceid >= 0 && H5Sclose(dimid_spaceid) < 0)
BAIL2(NC_EHDFERR);
if (dimid_attid >= 0 && H5Aclose(dimid_attid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal This function creates the HDF5 dataset for a variable.
*
* @param grp Pointer to group info struct.
* @param var Pointer to variable info struct.
* @param write_dimid True to write dimid.
*
* @return ::NC_NOERR
* @returns NC_ECHAR Conversions of NC_CHAR forbidden.
* @returns NC_EVARMETA HDF5 returning error creating datatype.
* @returns NC_EHDFERR HDF5 returning error.
* @returns NC_EBADTYE Type not found.
* @author Ed Hartnett
*/
static int
var_create_dataset(NC_GRP_INFO_T *grp, NC_VAR_INFO_T *var, nc_bool_t write_dimid)
{
NC_HDF5_GRP_INFO_T *hdf5_grp;
NC_HDF5_VAR_INFO_T *hdf5_var;
hid_t plistid = 0, access_plistid = 0, typeid = 0, spaceid = 0;
hsize_t chunksize[H5S_MAX_RANK], dimsize[H5S_MAX_RANK], maxdimsize[H5S_MAX_RANK];
int d;
void *fillp = NULL;
NC_DIM_INFO_T *dim = NULL;
char *name_to_use;
int retval;
unsigned int* params = NULL;
assert(grp && grp->format_grp_info && var && var->format_var_info);
LOG((3, "%s:: name %s", __func__, var->hdr.name));
/* Get HDF5-specific group and var info. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* Scalar or not, we need a creation property list. */
if ((plistid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
BAIL(NC_EHDFERR);
if ((access_plistid = H5Pcreate(H5P_DATASET_ACCESS)) < 0)
BAIL(NC_EHDFERR);
/* Turn off object tracking times in HDF5. */
if (H5Pset_obj_track_times(plistid, 0) < 0)
BAIL(NC_EHDFERR);
/* Find the HDF5 type of the dataset. */
if ((retval = nc4_get_hdf_typeid(grp->nc4_info, var->type_info->hdr.id, &typeid,
var->type_info->endianness)))
BAIL(retval);
/* Figure out what fill value to set, if any. */
if (var->no_fill)
{
/* Required to truly turn HDF5 fill values off */
if (H5Pset_fill_time(plistid, H5D_FILL_TIME_NEVER) < 0)
BAIL(NC_EHDFERR);
}
else
{
if ((retval = nc4_get_fill_value(grp->nc4_info, var, &fillp)))
BAIL(retval);
/* If there is a fill value, set it. */
if (fillp)
{
if (var->type_info->nc_type_class == NC_STRING)
{
if (H5Pset_fill_value(plistid, typeid, fillp) < 0)
BAIL(NC_EHDFERR);
}
else
{
/* The fill value set in HDF5 must always be presented as
* a native type, even if the endianness for this dataset
* is non-native. HDF5 will translate the fill value to
* the target endiannesss. */
hid_t fill_typeid = 0;
if ((retval = nc4_get_hdf_typeid(grp->nc4_info, var->type_info->hdr.id, &fill_typeid,
NC_ENDIAN_NATIVE)))
BAIL(retval);
if (H5Pset_fill_value(plistid, fill_typeid, fillp) < 0)
{
if (H5Tclose(fill_typeid) < 0)
BAIL(NC_EHDFERR);
BAIL(NC_EHDFERR);
}
if (H5Tclose(fill_typeid) < 0)
BAIL(NC_EHDFERR);
}
}
}
/* If the user wants to compress the data, using either zlib
* (a.k.a deflate) or szip, or another filter, set that up now.
* Szip and zip can be turned on
* either directly with nc_def_var_szip/deflate(), or using
* nc_def_var_filter(). If the user
* has specified a filter, it will be applied here. */
if(var->filters != NULL) {
int j;
NClist* filters = (NClist*)var->filters;
for(j=0;j<nclistlength(filters);j++) {
struct NC_HDF5_Filter* fi = (struct NC_HDF5_Filter*)nclistget(filters,j);
if(fi->filterid == H5Z_FILTER_FLETCHER32) {
if(H5Pset_fletcher32(plistid) < 0)
BAIL(NC_EHDFERR);
} else if(fi->filterid == H5Z_FILTER_SHUFFLE) {
if(H5Pset_shuffle(plistid) < 0)
BAIL(NC_EHDFERR);
} else if(fi->filterid == H5Z_FILTER_DEFLATE) {/* Handle zip case here */
unsigned level;
if(fi->nparams != 1)
BAIL(NC_EFILTER);
level = (int)fi->params[0];
if(H5Pset_deflate(plistid, level) < 0)
BAIL(NC_EFILTER);
} else if(fi->filterid == H5Z_FILTER_SZIP) {/* Handle szip case here */
int options_mask;
int bits_per_pixel;
if(fi->nparams != 2)
BAIL(NC_EFILTER);
options_mask = (int)fi->params[0];
bits_per_pixel = (int)fi->params[1];
if(H5Pset_szip(plistid, options_mask, bits_per_pixel) < 0)
BAIL(NC_EFILTER);
} else {
herr_t code = H5Pset_filter(plistid, fi->filterid,
#if 1
H5Z_FLAG_MANDATORY,
#else
H5Z_FLAG_OPTIONAL,
#endif
fi->nparams, fi->params);
if(code < 0)
BAIL(NC_EFILTER);
}
}
}
/* If ndims non-zero, get info for all dimensions. We look up the
dimids and get the len of each dimension. We need this to create
the space for the dataset. In netCDF a dimension length of zero
means an unlimited dimension. */
if (var->ndims)
{
int unlimdim = 0;
/* Check to see if any unlimited dimensions are used in this var. */
for (d = 0; d < var->ndims; d++) {
dim = var->dim[d];
assert(dim && dim->hdr.id == var->dimids[d]);
if (dim->unlimited)
unlimdim++;
}
/* If there are no unlimited dims, and no filters, and the user
* has not specified chunksizes, use contiguous variable for
* better performance. */
if (nclistlength((NClist*)var->filters) == 0 &&
(var->chunksizes == NULL || !var->chunksizes[0]) && !unlimdim)
var->storage = NC_CONTIGUOUS;
/* Gather current & maximum dimension sizes, along with chunk
* sizes. */
for (d = 0; d < var->ndims; d++)
{
dim = var->dim[d];
assert(dim && dim->hdr.id == var->dimids[d]);
dimsize[d] = dim->unlimited ? NC_HDF5_UNLIMITED_DIMSIZE : dim->len;
maxdimsize[d] = dim->unlimited ? H5S_UNLIMITED : (hsize_t)dim->len;
if (var->storage == NC_CHUNKED)
{
if (var->chunksizes[d])
chunksize[d] = var->chunksizes[d];
else
{
size_t type_size;
if (var->type_info->nc_type_class == NC_STRING)
type_size = sizeof(char *);
else
type_size = var->type_info->size;
/* Unlimited dim always gets chunksize of 1. */
if (dim->unlimited)
chunksize[d] = 1;
else
chunksize[d] = pow((double)DEFAULT_CHUNK_SIZE/type_size,
1/(double)(var->ndims - unlimdim));
/* If the chunksize is greater than the dim
* length, make it the dim length. */
if (!dim->unlimited && chunksize[d] > dim->len)
chunksize[d] = dim->len;
/* Remember the computed chunksize */
var->chunksizes[d] = chunksize[d];
}
}
}
/* Create the dataspace. */
if ((spaceid = H5Screate_simple(var->ndims, dimsize, maxdimsize)) < 0)
BAIL(NC_EHDFERR);
}
else
{
if ((spaceid = H5Screate(H5S_SCALAR)) < 0)
BAIL(NC_EHDFERR);
}
/* Set the var storage to contiguous, compact, or chunked. Don't
* try to set chunking for scalar vars, they will default to
* contiguous if not set to compact. */
if (var->storage == NC_CONTIGUOUS)
{
if (H5Pset_layout(plistid, H5D_CONTIGUOUS) < 0)
BAIL(NC_EHDFERR);
}
else if (var->storage == NC_COMPACT)
{
if (H5Pset_layout(plistid, H5D_COMPACT) < 0)
BAIL(NC_EHDFERR);
}
else if (var->ndims)
{
if (H5Pset_chunk(plistid, var->ndims, chunksize) < 0)
BAIL(NC_EHDFERR);
}
/* Turn on creation order tracking. */
if (!grp->nc4_info->no_attr_create_order) {
if (H5Pset_attr_creation_order(plistid, H5P_CRT_ORDER_TRACKED|
H5P_CRT_ORDER_INDEXED) < 0)
BAIL(NC_EHDFERR);
}
/* Set per-var chunk cache, for chunked datasets. */
if (var->storage == NC_CHUNKED && var->chunkcache.size)
if (H5Pset_chunk_cache(access_plistid, var->chunkcache.nelems,
var->chunkcache.size, var->chunkcache.preemption) < 0)
BAIL(NC_EHDFERR);
/* At long last, create the dataset. */
name_to_use = var->alt_name ? var->alt_name : var->hdr.name;
LOG((4, "%s: about to H5Dcreate2 dataset %s of type 0x%x", __func__,
name_to_use, typeid));
if ((hdf5_var->hdf_datasetid = H5Dcreate2(hdf5_grp->hdf_grpid, name_to_use, typeid,
spaceid, H5P_DEFAULT, plistid, access_plistid)) < 0)
BAIL(NC_EHDFERR);
var->created = NC_TRUE;
var->is_new_var = NC_FALSE;
/* Always write the hidden coordinates attribute, which lists the
* dimids of this var. When present, this speeds opens. When not
* present, dimscale matching is used. */
if (var->ndims)
if ((retval = write_coord_dimids(var)))
BAIL(retval);
/* If this is a dimscale, mark it as such in the HDF5 file. Also
* find the dimension info and store the dataset id of the dimscale
* dataset. */
if (hdf5_var->dimscale)
{
if (H5DSset_scale(hdf5_var->hdf_datasetid, var->hdr.name) < 0)
BAIL(NC_EHDFERR);
/* If this is a multidimensional coordinate variable, write a
* coordinates attribute. */
/* if (var->ndims > 1) */
/* if ((retval = write_coord_dimids(var))) */
/* BAIL(retval); */
/* If desired, write the netCDF dimid. */
if (write_dimid)
if ((retval = write_netcdf4_dimid(hdf5_var->hdf_datasetid, var->dimids[0])))
BAIL(retval);
}
/* If quantization is in use, write an attribute indicating it, a
* single integer which is the number of significant digits
* (NSD, for BitGroom and Granular BitRound) or number of significant bits
* (NSB, for BitRound). */
if (var->quantize_mode)
if ((retval = write_quantize_att(var)))
BAIL(retval);
/* Write attributes for this var. */
if ((retval = write_attlist(var->att, var->hdr.id, grp)))
BAIL(retval);
/* The file is now up-to-date with all settings for this var. */
var->attr_dirty = NC_FALSE;
exit:
nullfree(params);
if (typeid > 0 && H5Tclose(typeid) < 0)
BAIL2(NC_EHDFERR);
if (plistid > 0 && H5Pclose(plistid) < 0)
BAIL2(NC_EHDFERR);
if (access_plistid > 0 && H5Pclose(access_plistid) < 0)
BAIL2(NC_EHDFERR);
if (spaceid > 0 && H5Sclose(spaceid) < 0)
BAIL2(NC_EHDFERR);
if (fillp)
{
if (var->type_info->nc_type_class == NC_VLEN)
nc_free_vlen((nc_vlen_t *)fillp);
else if (var->type_info->nc_type_class == NC_STRING && *(char **)fillp)
free(*(char **)fillp);
free(fillp);
}
return retval;
}
/**
* @internal Adjust the chunk cache of a var for better
* performance.
*
* @note For contiguous and compact storage vars, or when parallel I/O
* is in use, this function will do nothing and return ::NC_NOERR;
*
* @param grp Pointer to group info struct.
* @param var Pointer to var info struct.
*
* @return ::NC_NOERR No error.
* @author Ed Hartnett
*/
int
nc4_adjust_var_cache(NC_GRP_INFO_T *grp, NC_VAR_INFO_T *var)
{
size_t chunk_size_bytes = 1;
int d;
int retval;
/* Nothing to be done for contiguous or compact data. */
if (var->storage != NC_CHUNKED)
return NC_NOERR;
#ifdef USE_PARALLEL4
/* Don't set cache for files using parallel I/O. */
if (grp->nc4_info->parallel)
return NC_NOERR;
#endif
/* How many bytes in the chunk? */
for (d = 0; d < var->ndims; d++)
chunk_size_bytes *= var->chunksizes[d];
if (var->type_info->size)
chunk_size_bytes *= var->type_info->size;
else
chunk_size_bytes *= sizeof(char *);
/* If the chunk cache is too small, and the user has not changed
* the default value of the chunk cache size, then increase the
* size of the cache. */
if (var->chunkcache.size == CHUNK_CACHE_SIZE)
if (chunk_size_bytes > var->chunkcache.size)
{
var->chunkcache.size = chunk_size_bytes * DEFAULT_CHUNKS_IN_CACHE;
if (var->chunkcache.size > MAX_DEFAULT_CACHE_SIZE)
var->chunkcache.size = MAX_DEFAULT_CACHE_SIZE;
if ((retval = nc4_reopen_dataset(grp, var)))
return retval;
}
return NC_NOERR;
}
/**
* @internal Create a HDF5 defined type from a NC_TYPE_INFO_T struct,
* and commit it to the file.
*
* @param grp Pointer to group info struct.
* @param type Pointer to type info struct.
*
* @return NC_NOERR No error.
* @return NC_EHDFERR HDF5 error.
* @return NC_ECHAR Conversions of NC_CHAR forbidden.
* @return NC_EVARMETA HDF5 returning error creating datatype.
* @return NC_EHDFERR HDF5 returning error.
* @return NC_EBADTYE Type not found.
* @author Ed Hartnett
*/
static int
commit_type(NC_GRP_INFO_T *grp, NC_TYPE_INFO_T *type)
{
NC_HDF5_GRP_INFO_T *hdf5_grp;
NC_HDF5_TYPE_INFO_T *hdf5_type;
hid_t base_hdf_typeid;
int retval;
assert(grp && grp->format_grp_info && type && type->format_type_info);
/* Get HDF5-specific group and type info. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
hdf5_type = (NC_HDF5_TYPE_INFO_T *)type->format_type_info;
/* Did we already record this type? */
if (type->committed)
return NC_NOERR;
/* Is this a compound type? */
if (type->nc_type_class == NC_COMPOUND)
{
NC_FIELD_INFO_T *field;
hid_t hdf_base_typeid, hdf_typeid;
int i;
if ((hdf5_type->hdf_typeid = H5Tcreate(H5T_COMPOUND, type->size)) < 0)
return NC_EHDFERR;
LOG((4, "creating compound type %s hdf_typeid 0x%x", type->hdr.name,
hdf5_type->hdf_typeid));
for(i=0;i<nclistlength(type->u.c.field);i++)
{
field = (NC_FIELD_INFO_T *)nclistget(type->u.c.field, i);
assert(field);
if ((retval = nc4_get_hdf_typeid(grp->nc4_info, field->nc_typeid,
&hdf_base_typeid, type->endianness)))
return retval;
/* If this is an array, create a special array type. */
if (field->ndims)
{
int d;
hsize_t dims[NC_MAX_VAR_DIMS];
for (d = 0; d < field->ndims; d++)
dims[d] = field->dim_size[d];
if ((hdf_typeid = H5Tarray_create1(hdf_base_typeid, field->ndims,
dims, NULL)) < 0)
{
if (H5Tclose(hdf_base_typeid) < 0)
return NC_EHDFERR;
return NC_EHDFERR;
}
if (H5Tclose(hdf_base_typeid) < 0)
return NC_EHDFERR;
}
else
hdf_typeid = hdf_base_typeid;
LOG((4, "inserting field %s offset %d hdf_typeid 0x%x", field->hdr.name,
field->offset, hdf_typeid));
if (H5Tinsert(hdf5_type->hdf_typeid, field->hdr.name, field->offset,
hdf_typeid) < 0)
return NC_EHDFERR;
if (H5Tclose(hdf_typeid) < 0)
return NC_EHDFERR;
}
}
else if (type->nc_type_class == NC_VLEN)
{
/* Find the HDF typeid of the base type of this vlen. */
if ((retval = nc4_get_hdf_typeid(grp->nc4_info, type->u.v.base_nc_typeid,
&base_hdf_typeid, type->endianness)))
return retval;
/* Create a vlen type. */
if ((hdf5_type->hdf_typeid = H5Tvlen_create(base_hdf_typeid)) < 0)
return NC_EHDFERR;
}
else if (type->nc_type_class == NC_OPAQUE)
{
/* Create the opaque type. */
if ((hdf5_type->hdf_typeid = H5Tcreate(H5T_OPAQUE, type->size)) < 0)
return NC_EHDFERR;
}
else if (type->nc_type_class == NC_ENUM)
{
NC_ENUM_MEMBER_INFO_T *enum_m;
int i;
if (nclistlength(type->u.e.enum_member) == 0)
return NC_EINVAL;
/* Find the HDF typeid of the base type of this enum. */
if ((retval = nc4_get_hdf_typeid(grp->nc4_info, type->u.e.base_nc_typeid,
&base_hdf_typeid, type->endianness)))
return retval;
/* Create an enum type. */
if ((hdf5_type->hdf_typeid = H5Tenum_create(base_hdf_typeid)) < 0)
return NC_EHDFERR;
/* Add all the members to the HDF5 type. */
for(i=0;i<nclistlength(type->u.e.enum_member);i++) {
enum_m = (NC_ENUM_MEMBER_INFO_T*)nclistget(type->u.e.enum_member,i);
if (H5Tenum_insert(hdf5_type->hdf_typeid, enum_m->name, enum_m->value) < 0)
return NC_EHDFERR;
}
}
else
{
LOG((0, "Unknown class: %d", type->nc_type_class));
return NC_EBADTYPE;
}
/* Commit the type. */
if (H5Tcommit1(hdf5_grp->hdf_grpid, type->hdr.name, hdf5_type->hdf_typeid) < 0)
return NC_EHDFERR;
type->committed = NC_TRUE;
LOG((4, "just committed type %s, HDF typeid: 0x%x", type->hdr.name,
hdf5_type->hdf_typeid));
/* Later we will always use the native typeid. In this case, it is
* a copy of the same type pointed to by hdf_typeid, but it's
* easier to maintain a copy. */
if ((hdf5_type->native_hdf_typeid = H5Tget_native_type(hdf5_type->hdf_typeid,
H5T_DIR_DEFAULT)) < 0)
return NC_EHDFERR;
return NC_NOERR;
}
/**
* @internal Write an attribute, with value 1, to indicate that strict
* NC3 rules apply to this file.
*
* @param hdf_grpid HDF5 group ID.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
static int
write_nc3_strict_att(hid_t hdf_grpid)
{
hid_t attid = 0, spaceid = 0;
int one = 1;
int retval = NC_NOERR;
htri_t attr_exists;
/* If the attribute already exists, call that a success and return
* NC_NOERR. */
if ((attr_exists = H5Aexists(hdf_grpid, NC3_STRICT_ATT_NAME)) < 0)
return NC_EHDFERR;
if (attr_exists)
return NC_NOERR;
/* Create the attribute to mark this as a file that needs to obey
* strict netcdf-3 rules. */
if ((spaceid = H5Screate(H5S_SCALAR)) < 0)
BAIL(NC_EFILEMETA);
if ((attid = H5Acreate1(hdf_grpid, NC3_STRICT_ATT_NAME,
H5T_NATIVE_INT, spaceid, H5P_DEFAULT)) < 0)
BAIL(NC_EFILEMETA);
if (H5Awrite(attid, H5T_NATIVE_INT, &one) < 0)
BAIL(NC_EFILEMETA);
exit:
if (spaceid > 0 && (H5Sclose(spaceid) < 0))
BAIL2(NC_EFILEMETA);
if (attid > 0 && (H5Aclose(attid) < 0))
BAIL2(NC_EFILEMETA);
return retval;
}
/**
* @internal Create a HDF5 group that is not the root group. HDF5
* properties are set in the group to ensure that objects and
* attributes are kept in creation order, instead of alphebetical
* order (the HDF5 default).
*
* @param grp Pointer to group info struct.
*
* @return NC_NOERR No error.
* @return NC_EHDFERR HDF5 error.
* @author Ed Hartnett
*/
static int
create_group(NC_GRP_INFO_T *grp)
{
NC_HDF5_GRP_INFO_T *hdf5_grp, *parent_hdf5_grp;
hid_t gcpl_id = -1;
int retval = NC_NOERR;;
assert(grp && grp->format_grp_info && grp->parent &&
grp->parent->format_grp_info);
/* Get HDF5 specific group info for group and parent. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
parent_hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->parent->format_grp_info;
assert(parent_hdf5_grp->hdf_grpid);
/* Create group, with link_creation_order set in the group
* creation property list. */
if ((gcpl_id = H5Pcreate(H5P_GROUP_CREATE)) < 0)
BAIL(NC_EHDFERR);
/* Set track_times to be FALSE. */
if (H5Pset_obj_track_times(gcpl_id, 0) < 0)
BAIL(NC_EHDFERR);
/* Tell HDF5 to keep track of objects in creation order. */
if (H5Pset_link_creation_order(gcpl_id, H5P_CRT_ORDER_TRACKED|H5P_CRT_ORDER_INDEXED) < 0)
BAIL(NC_EHDFERR);
/* Tell HDF5 to keep track of attributes in creation order. */
if (!grp->nc4_info->no_attr_create_order) {
if (H5Pset_attr_creation_order(gcpl_id, H5P_CRT_ORDER_TRACKED|H5P_CRT_ORDER_INDEXED) < 0)
BAIL(NC_EHDFERR);
}
/* Create the group. */
if ((hdf5_grp->hdf_grpid = H5Gcreate2(parent_hdf5_grp->hdf_grpid, grp->hdr.name,
H5P_DEFAULT, gcpl_id, H5P_DEFAULT)) < 0)
BAIL(NC_EHDFERR);
exit:
if (gcpl_id > -1 && H5Pclose(gcpl_id) < 0)
BAIL2(NC_EHDFERR);
if (retval)
if (hdf5_grp->hdf_grpid > 0 && H5Gclose(hdf5_grp->hdf_grpid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal After all the datasets of the file have been read, it's
* time to sort the wheat from the chaff. Which of the datasets are
* netCDF dimensions, and which are coordinate variables, and which
* are non-coordinate variables.
*
* @param grp Pointer to group info struct.
*
* @return ::NC_NOERR No error.
* @returns NC_EDIMSCALE HDF5 returned an error when trying to attach a dimension scale.
* @author Ed Hartnett
*/
static int
attach_dimscales(NC_GRP_INFO_T *grp)
{
NC_VAR_INFO_T *var;
NC_HDF5_VAR_INFO_T *hdf5_var;
int d, v;
/* Attach dimension scales. */
for (v = 0; v < ncindexsize(grp->vars); v++)
{
/* Get pointer to var and HDF5-specific var info. */
var = (NC_VAR_INFO_T *)ncindexith(grp->vars, v);
assert(var && var->format_var_info);
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* Scales themselves do not attach. But I really wish they
* would. */
if (hdf5_var->dimscale)
continue;
/* Find the scale for each dimension, if any, and attach it. */
for (d = 0; d < var->ndims; d++)
{
/* Is there a dimscale for this dimension? */
if (hdf5_var->dimscale_attached)
{
if (!hdf5_var->dimscale_attached[d])
{
hid_t dsid; /* Dataset ID for dimension */
assert(var->dim[d] && var->dim[d]->hdr.id == var->dimids[d] &&
var->dim[d]->format_dim_info);
LOG((2, "%s: attaching scale for dimid %d to var %s",
__func__, var->dimids[d], var->hdr.name));
/* Find dataset ID for dimension */
if (var->dim[d]->coord_var)
dsid = ((NC_HDF5_VAR_INFO_T *)(var->dim[d]->coord_var->format_var_info))->hdf_datasetid;
else
dsid = ((NC_HDF5_DIM_INFO_T *)var->dim[d]->format_dim_info)->hdf_dimscaleid;
assert(dsid > 0);
/* Attach the scale. */
if (H5DSattach_scale(hdf5_var->hdf_datasetid, dsid, d) < 0)
return NC_EDIMSCALE;
hdf5_var->dimscale_attached[d] = NC_TRUE;
}
}
}
}
return NC_NOERR;
}
/**
* @internal Does a variable exist?
*
* @param grpid HDF5 group ID.
* @param name Name of variable.
* @param exists Pointer that gets 1 of the variable exists, 0 otherwise.
*
* @return ::NC_NOERR No error.
* @author Ed Hartnett
*/
static int
var_exists(hid_t grpid, char *name, nc_bool_t *exists)
{
htri_t link_exists;
/* Reset the boolean */
*exists = NC_FALSE;
/* Check if the object name exists in the group */
if ((link_exists = H5Lexists(grpid, name, H5P_DEFAULT)) < 0)
return NC_EHDFERR;
if (link_exists)
{
H5G_stat_t statbuf;
/* Get info about the object */
if (H5Gget_objinfo(grpid, name, 1, &statbuf) < 0)
return NC_EHDFERR;
if (H5G_DATASET == statbuf.type)
*exists = NC_TRUE;
}
return NC_NOERR;
}
/**
* @internal Convert a coordinate variable HDF5 dataset into one that
* is not a coordinate variable. This happens during renaming of vars
* and dims. This function removes the HDF5 NAME and CLASS attributes
* associated with dimension scales, and also the NC_DIMID_ATT_NAME
* attribute which may be present, and, if it does, holds the dimid of
* the coordinate variable.
*
* @param hdf_datasetid The HDF5 dataset ID of the coordinate variable
* dataset.
*
* @return ::NC_NOERR No error.
* @return ::NC_EHDFERR HDF5 error.
* @author Ed Hartnett
*/
static int
remove_coord_atts(hid_t hdf_datasetid)
{
htri_t attr_exists;
/* If the variable dataset has an optional NC_DIMID_ATT_NAME
* attribute, delete it. */
if ((attr_exists = H5Aexists(hdf_datasetid, NC_DIMID_ATT_NAME)) < 0)
return NC_EHDFERR;
if (attr_exists)
{
if (H5Adelete(hdf_datasetid, NC_DIMID_ATT_NAME) < 0)
return NC_EHDFERR;
}
/* Remove the dimension scale 'CLASS' & 'NAME' attributes. */
if ((attr_exists = H5Aexists(hdf_datasetid,
HDF5_DIMSCALE_CLASS_ATT_NAME)) < 0)
return NC_EHDFERR;
if (attr_exists)
{
if (H5Adelete(hdf_datasetid, HDF5_DIMSCALE_CLASS_ATT_NAME) < 0)
return NC_EHDFERR;
}
if ((attr_exists = H5Aexists(hdf_datasetid,
HDF5_DIMSCALE_NAME_ATT_NAME)) < 0)
return NC_EHDFERR;
if (attr_exists)
{
if (H5Adelete(hdf_datasetid, HDF5_DIMSCALE_NAME_ATT_NAME) < 0)
return NC_EHDFERR;
}
return NC_NOERR;
}
/**
* @internal This function writes a variable. The principle difficulty
* comes from the possibility that this is a coordinate variable, and
* was already written to the file as a dimension-only dimscale. If
* this occurs, then it must be deleted and recreated.
*
* @param var Pointer to variable info struct.
* @param grp Pointer to group info struct.
* @param write_dimid
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett, Quincey Koziol
*/
static int
write_var(NC_VAR_INFO_T *var, NC_GRP_INFO_T *grp, nc_bool_t write_dimid)
{
NC_HDF5_GRP_INFO_T *hdf5_grp;
NC_HDF5_VAR_INFO_T *hdf5_var;
nc_bool_t replace_existing_var = NC_FALSE;
int retval;
assert(var && var->format_var_info && grp && grp->format_grp_info);
LOG((4, "%s: writing var %s", __func__, var->hdr.name));
/* Get HDF5-specific group and var info. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* If the variable has already been created & the fill value changed,
* indicate that the existing variable should be replaced. */
if (var->created && var->fill_val_changed)
{
replace_existing_var = NC_TRUE;
var->fill_val_changed = NC_FALSE;
/* If the variable is going to be replaced, we need to flag any
other attributes associated with the variable as 'dirty', or
else *only* the fill value attribute will be copied over and
the rest will be lost. See
https://github.com/Unidata/netcdf-c/issues/239 */
flag_atts_dirty(var->att);
}
/* Is this a coordinate var that has already been created in
* the HDF5 file as a dimscale dataset? Check for dims with the
* same name in this group. If there is one, check to see if
* this object exists in the HDF group. */
if (var->became_coord_var)
{
if ((NC_DIM_INFO_T *)ncindexlookup(grp->dim, var->hdr.name))
{
nc_bool_t exists;
if ((retval = var_exists(hdf5_grp->hdf_grpid, var->hdr.name, &exists)))
return retval;
if (exists)
{
/* Indicate that the variable already exists, and should
* be replaced. */
replace_existing_var = NC_TRUE;
flag_atts_dirty(var->att);
}
}
}
/* Check dims if the variable will be replaced, so that the
* dimensions will be de-attached and re-attached correctly. */
if (replace_existing_var)
{
NC_DIM_INFO_T *d1;
/* Is there a dim with this var's name? */
if ((d1 = (NC_DIM_INFO_T *)ncindexlookup(grp->dim, var->hdr.name)))
{
nc_bool_t exists;
assert(d1->format_dim_info && d1->hdr.name);
if ((retval = var_exists(hdf5_grp->hdf_grpid, var->hdr.name, &exists)))
return retval;
if (exists)
{
hid_t dsid;
/* Find dataset ID for dimension */
if (d1->coord_var)
dsid = ((NC_HDF5_VAR_INFO_T *)d1->coord_var->format_var_info)->hdf_datasetid;
else
dsid = ((NC_HDF5_DIM_INFO_T *)d1->format_dim_info)->hdf_dimscaleid;
assert(dsid > 0);
/* If we're replacing an existing dimscale dataset, go to
* every var in the file and detach this dimension scale,
* because we have to delete it. */
if ((retval = rec_detach_scales(grp->nc4_info->root_grp,
var->dimids[0], dsid)))
return retval;
}
}
}
/* If this is not a dimension scale, remove any attached scales,
* and delete dimscale attributes from the var. */
if (var->was_coord_var && hdf5_var->dimscale_attached)
{
int d;
/* If the variable already exists in the file, Remove any dimension scale
* attributes from it, if they exist. */
if (var->created)
if ((retval = remove_coord_atts(hdf5_var->hdf_datasetid)))
return retval;
/* If this is a regular var, detach all its dim scales. */
for (d = 0; d < var->ndims; d++)
{
if (hdf5_var->dimscale_attached[d])
{
hid_t dsid; /* Dataset ID for dimension */
assert(var->dim[d] && var->dim[d]->hdr.id == var->dimids[d] &&
var->dim[d]->format_dim_info);
/* Find dataset ID for dimension */
if (var->dim[d]->coord_var)
dsid = ((NC_HDF5_VAR_INFO_T *)var->dim[d]->coord_var->format_var_info)->hdf_datasetid;
else
dsid = ((NC_HDF5_DIM_INFO_T *)var->dim[d]->format_dim_info)->hdf_dimscaleid;
assert(dsid > 0);
/* Detach this dim scale. */
if (H5DSdetach_scale(hdf5_var->hdf_datasetid, dsid, d) < 0)
return NC_EHDFERR;
hdf5_var->dimscale_attached[d] = NC_FALSE;
}
}
}
/* Delete the HDF5 dataset that is to be replaced. */
if (replace_existing_var)
{
/* Free the HDF5 dataset id. */
if (hdf5_var->hdf_datasetid && H5Dclose(hdf5_var->hdf_datasetid) < 0)
return NC_EHDFERR;
hdf5_var->hdf_datasetid = 0;
/* Now delete the variable. */
if (H5Gunlink(hdf5_grp->hdf_grpid, var->hdr.name) < 0)
return NC_EDIMMETA;
}
/* Create the dataset. */
if (var->is_new_var || replace_existing_var)
{
if ((retval = var_create_dataset(grp, var, write_dimid)))
return retval;
}
else
{
if (write_dimid && var->ndims)
if ((retval = write_netcdf4_dimid(hdf5_var->hdf_datasetid,
var->dimids[0])))
return retval;
}
if (replace_existing_var)
{
/* If this is a dimension scale, reattach the scale everywhere it
* is used. (Recall that netCDF dimscales are always 1-D). */
if(hdf5_var->dimscale)
{
if ((retval = rec_reattach_scales(grp->nc4_info->root_grp,
var->dimids[0], hdf5_var->hdf_datasetid)))
return retval;
}
/* If it's not a dimension scale, clear the dimscale attached flags,
* so the dimensions are re-attached. */
else
{
if (hdf5_var->dimscale_attached)
memset(hdf5_var->dimscale_attached, 0, sizeof(nc_bool_t) * var->ndims);
}
}
/* Clear coord. var state transition flags */
var->was_coord_var = NC_FALSE;
var->became_coord_var = NC_FALSE;
/* Now check the attributes for this var. */
if (var->attr_dirty)
{
/* Write attributes for this var. */
if ((retval = write_attlist(var->att, var->hdr.id, grp)))
return retval;
var->attr_dirty = NC_FALSE;
}
return NC_NOERR;
}
/**
* @internal Write a HDF5 dataset which is a dimension without a
* coordinate variable. This is a special 1-D dataset.
*
* @param dim Pointer to dim info struct.
* @param grp Pointer to group info struct.
* @param write_dimid
*
* @returns ::NC_NOERR No error.
* @returns ::NC_EPERM Read-only file.
* @returns ::NC_EHDFERR HDF5 returned error.
* @author Ed Hartnett
*/
int
nc4_create_dim_wo_var(NC_DIM_INFO_T *dim)
{
NC_HDF5_DIM_INFO_T *hdf5_dim;
NC_HDF5_GRP_INFO_T *hdf5_grp;
hid_t spaceid = -1, create_propid = -1;
hsize_t dims[1], max_dims[1], chunk_dims[1] = {1};
char dimscale_wo_var[NC_MAX_NAME];
int retval = NC_NOERR;
LOG((4, "%s: creating dim %s", __func__, dim->hdr.name));
/* Sanity check */
assert(!dim->coord_var);
/* Get HDF5-specific dim and group info. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)dim->container->format_grp_info;
hdf5_dim = (NC_HDF5_DIM_INFO_T *)dim->format_dim_info;
/* Create a property list. */
if ((create_propid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
BAIL(NC_EHDFERR);
/* Turn off recording of times associated with this object. */
if (H5Pset_obj_track_times(create_propid, 0) < 0)
BAIL(NC_EHDFERR);
/* Set size of dataset to size of dimension. */
dims[0] = dim->len;
max_dims[0] = dim->len;
/* If this dimension scale is unlimited (i.e. it's an unlimited
* dimension), then set up chunking, with a chunksize of 1. */
if (dim->unlimited)
{
max_dims[0] = H5S_UNLIMITED;
if (H5Pset_chunk(create_propid, 1, chunk_dims) < 0)
BAIL(NC_EHDFERR);
}
/* Set up space. */
if ((spaceid = H5Screate_simple(1, dims, max_dims)) < 0)
BAIL(NC_EHDFERR);
/* Turn on creation-order tracking. */
if (!dim->container->nc4_info->no_attr_create_order) {
if (H5Pset_attr_creation_order(create_propid, H5P_CRT_ORDER_TRACKED|
H5P_CRT_ORDER_INDEXED) < 0)
BAIL(NC_EHDFERR);
}
/* Create the dataset that will be the dimension scale. */
LOG((4, "%s: about to H5Dcreate1 a dimscale dataset %s", __func__,
dim->hdr.name));
if ((hdf5_dim->hdf_dimscaleid = H5Dcreate2(hdf5_grp->hdf_grpid, dim->hdr.name,
H5T_IEEE_F32BE, spaceid,
H5P_DEFAULT, create_propid,
H5P_DEFAULT)) < 0)
BAIL(NC_EHDFERR);
/* Indicate that this is a scale. Also indicate that not
* be shown to the user as a variable. It is hidden. It is
* a DIM WITHOUT A VARIABLE! */
sprintf(dimscale_wo_var, "%s%10d", DIM_WITHOUT_VARIABLE, (int)dim->len);
if (H5DSset_scale(hdf5_dim->hdf_dimscaleid, dimscale_wo_var) < 0)
BAIL(NC_EHDFERR);
/* Since this dimension was created out of order, we cannot rely on
* it getting the correct dimid on file open. We must assign it
* explicitly. */
if ((retval = write_netcdf4_dimid(hdf5_dim->hdf_dimscaleid, dim->hdr.id)))
BAIL(retval);
exit:
if (spaceid > 0 && H5Sclose(spaceid) < 0)
BAIL2(NC_EHDFERR);
if (create_propid > 0 && H5Pclose(create_propid) < 0)
BAIL2(NC_EHDFERR);
return retval;
}
/**
* @internal Write a dimension.
*
* @param dim Pointer to dim info struct.
* @param grp Pointer to group info struct.
* @param write_dimid
*
* @returns ::NC_NOERR No error.
* @returns ::NC_EPERM Read-only file.
* @returns ::NC_EHDFERR HDF5 returned error.
* @author Ed Hartnett
*/
static int
write_dim(NC_DIM_INFO_T *dim, NC_GRP_INFO_T *grp, nc_bool_t write_dimid)
{
NC_HDF5_DIM_INFO_T *hdf5_dim;
int retval = NC_NOERR;
assert(dim && dim->format_dim_info && grp && grp->format_grp_info);
/* Get HDF5-specific dim and group info. */
hdf5_dim = (NC_HDF5_DIM_INFO_T *)dim->format_dim_info;
/* If there's no dimscale dataset for this dim, create one,
* and mark that it should be hidden from netCDF as a
* variable. (That is, it should appear as a dimension
* without an associated variable.) */
if (!hdf5_dim->hdf_dimscaleid)
if ((retval = nc4_create_dim_wo_var(dim)))
BAIL(retval);
/* Did we extend an unlimited dimension? */
if (dim->extended)
{
NC_VAR_INFO_T *v1 = NULL;
assert(dim->unlimited);
/* If this is a dimension with an associated coordinate var,
* then update the length of that coord var. */
v1 = dim->coord_var;
if (v1)
{
NC_HDF5_VAR_INFO_T *hdf5_v1;
hsize_t *new_size;
int d1;
hdf5_v1 = (NC_HDF5_VAR_INFO_T *)v1->format_var_info;
/* Extend the dimension scale dataset to reflect the new
* length of the dimension. */
if (!(new_size = malloc(v1->ndims * sizeof(hsize_t))))
BAIL(NC_ENOMEM);
for (d1 = 0; d1 < v1->ndims; d1++)
{
assert(v1->dim[d1] && v1->dim[d1]->hdr.id == v1->dimids[d1]);
new_size[d1] = v1->dim[d1]->len;
}
if (H5Dset_extent(hdf5_v1->hdf_datasetid, new_size) < 0)
BAIL(NC_EHDFERR);
free(new_size);
}
}
/* If desired, write the secret dimid. This will be used instead of
* the dimid that the dimension would otherwise receive based on
* creation order. This can be necessary when dims and their
* coordinate variables were created in different order. */
if (write_dimid && hdf5_dim->hdf_dimscaleid)
if ((retval = write_netcdf4_dimid(hdf5_dim->hdf_dimscaleid, dim->hdr.id)))
BAIL(retval);
exit:
return retval;
}
/**
* @internal Recursively write all the metadata in a group. Groups and
* types have all already been written. Propagate bad cooordinate
* order to subgroups, if detected.
*
* @param grp Pointer to group info struct.
* @param bad_coord_order 1 if there is a bad coordinate order.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
int
nc4_rec_write_metadata(NC_GRP_INFO_T *grp, nc_bool_t bad_coord_order)
{
NC_DIM_INFO_T *dim = NULL;
NC_VAR_INFO_T *var = NULL;
NC_GRP_INFO_T *child_grp = NULL;
int coord_varid = -1;
int var_index = 0;
int dim_index = 0;
int retval;
int i;
assert(grp && grp->hdr.name &&
((NC_HDF5_GRP_INFO_T *)(grp->format_grp_info))->hdf_grpid);
LOG((3, "%s: grp->hdr.name %s, bad_coord_order %d", __func__, grp->hdr.name,
bad_coord_order));
/* Write global attributes for this group. */
if ((retval = write_attlist(grp->att, NC_GLOBAL, grp)))
return retval;
/* Set the pointers to the beginning of the list of dims & vars in this
* group. */
dim = (NC_DIM_INFO_T *)ncindexith(grp->dim, dim_index);
var = (NC_VAR_INFO_T *)ncindexith(grp->vars, var_index);
/* Because of HDF5 ordering the dims and vars have to be stored in
* this way to ensure that the dims and coordinate vars come out in
* the correct order. */
while (dim || var)
{
nc_bool_t found_coord, wrote_coord;
/* Write non-coord dims in order, stopping at the first one that
* has an associated coord var. */
for (found_coord = NC_FALSE; dim && !found_coord; )
{
if (!dim->coord_var)
{
if ((retval = write_dim(dim, grp, bad_coord_order)))
return retval;
}
else
{
coord_varid = dim->coord_var->hdr.id;
found_coord = NC_TRUE;
}
dim = (NC_DIM_INFO_T *)ncindexith(grp->dim, ++dim_index);
}
/* Write each var. When we get to the coord var we are waiting
* for (if any), then we break after writing it. */
for (wrote_coord = NC_FALSE; var && !wrote_coord; )
{
if ((retval = write_var(var, grp, bad_coord_order)))
return retval;
if (found_coord && var->hdr.id == coord_varid)
wrote_coord = NC_TRUE;
var = (NC_VAR_INFO_T *)ncindexith(grp->vars, ++var_index);
}
} /* end while */
/* Attach dimscales to vars in this group. Unless directed not to. */
if (!grp->nc4_info->no_dimscale_attach) {
if ((retval = attach_dimscales(grp)))
return retval;
}
/* If there are any child groups, write their metadata. */
for (i = 0; i < ncindexsize(grp->children); i++)
{
child_grp = (NC_GRP_INFO_T *)ncindexith(grp->children, i);
assert(child_grp);
if ((retval = nc4_rec_write_metadata(child_grp, bad_coord_order)))
return retval;
}
return NC_NOERR;
}
/**
* @internal Recursively write all groups and types.
*
* @param grp Pointer to group info struct.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @author Ed Hartnett
*/
int
nc4_rec_write_groups_types(NC_GRP_INFO_T *grp)
{
NC_GRP_INFO_T *child_grp;
NC_HDF5_GRP_INFO_T *hdf5_grp;
NC_TYPE_INFO_T *type;
int retval;
int i;
assert(grp && grp->hdr.name && grp->format_grp_info);
LOG((3, "%s: grp->hdr.name %s", __func__, grp->hdr.name));
/* Get HDF5-specific group info. */
hdf5_grp = (NC_HDF5_GRP_INFO_T *)grp->format_grp_info;
/* Create the group in the HDF5 file if it doesn't exist. */
if (!hdf5_grp->hdf_grpid)
if ((retval = create_group(grp)))
return retval;
/* If this is the root group of a file with strict NC3 rules, write
* an attribute. But don't leave the attribute open. */
if (!grp->parent && (grp->nc4_info->cmode & NC_CLASSIC_MODEL))
if ((retval = write_nc3_strict_att(hdf5_grp->hdf_grpid)))
return retval;
/* If there are any user-defined types, write them now. */
for(i=0;i<ncindexsize(grp->type);i++) {
type = (NC_TYPE_INFO_T *)ncindexith(grp->type, i);
assert(type);
if ((retval = commit_type(grp, type)))
return retval;
}
/* If there are any child groups, write their groups and types. */
for(i=0;i<ncindexsize(grp->children);i++) {
if((child_grp = (NC_GRP_INFO_T*)ncindexith(grp->children,i)) == NULL) continue;
if ((retval = nc4_rec_write_groups_types(child_grp)))
return retval;
}
return NC_NOERR;
}
/**
* @internal In our first pass through the data, we may have
* encountered variables before encountering their dimscales, so go
* through the vars in this file and make sure we've got a dimid for
* each.
*
* @param grp Pointer to group info struct.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned an error.
* @returns NC_ENOMEM Out of memory.
* @author Ed Hartnett
*/
int
nc4_rec_match_dimscales(NC_GRP_INFO_T *grp)
{
NC_GRP_INFO_T *g;
NC_VAR_INFO_T *var;
NC_DIM_INFO_T *dim;
int retval = NC_NOERR;
int i;
assert(grp && grp->hdr.name);
LOG((4, "%s: grp->hdr.name %s", __func__, grp->hdr.name));
/* Perform var dimscale match for child groups. */
for (i = 0; i < ncindexsize(grp->children); i++)
{
g = (NC_GRP_INFO_T*)ncindexith(grp->children, i);
assert(g);
if ((retval = nc4_rec_match_dimscales(g)))
return retval;
}
/* Check all the vars in this group. If they have dimscale info,
* try and find a dimension for them. */
for (i = 0; i < ncindexsize(grp->vars); i++)
{
NC_HDF5_VAR_INFO_T *hdf5_var;
int ndims;
int d;
/* Get pointer to var and to the HDF5-specific var info. */
var = (NC_VAR_INFO_T*)ncindexith(grp->vars, i);
assert(var && var->format_var_info);
hdf5_var = (NC_HDF5_VAR_INFO_T *)var->format_var_info;
/* Check all vars and see if dim[i] != NULL if dimids[i] valid. */
/* This loop is very odd. Under normal circumstances, var->dimid[d] is zero
(from the initial calloc) which is a legitimate dimid. The code does not
distinquish this case from the dimscale case where the id might actually
be defined.
The original nc4_find_dim searched up the group tree looking for the given
dimid in one of the dim lists associated with each ancestor group.
I changed nc4_fnd_dim to use the dimid directly using h5->alldims.
However, here that is incorrect because it will find the dimid 0 always
(if any dimensions were defined). Except that when dimscale dimids have
been defined, one or more of the values in var->dimids will have a
legitimate value.
The solution I choose is to modify nc4_var_list_add to initialize dimids to
illegal values (-1). This is another example of the problems with dimscales.
*/
ndims = var->ndims;
for (d = 0; d < ndims; d++)
{
if (var->dim[d] == NULL) {
nc4_find_dim(grp, var->dimids[d], &var->dim[d], NULL);
}
/* assert(var->dim[d] && var->dim[d]->hdr.id == var->dimids[d]); */
}
/* Skip dimension scale variables */
if (!hdf5_var->dimscale)
{
int d;
int j;
/* Are there dimscales for this variable? */
if (hdf5_var->dimscale_hdf5_objids)
{
for (d = 0; d < var->ndims; d++)
{
nc_bool_t finished = NC_FALSE;
LOG((5, "%s: var %s has dimscale info...", __func__, var->hdr.name));
/* Check this and parent groups. */
for (g = grp; g && !finished; g = g->parent)
{
/* Check all dims in this group. */
for (j = 0; j < ncindexsize(g->dim); j++)
{
/* Get the HDF5 specific dim info. */
NC_HDF5_DIM_INFO_T *hdf5_dim;
dim = (NC_DIM_INFO_T *)ncindexith(g->dim, j);
assert(dim && dim->format_dim_info);
hdf5_dim = (NC_HDF5_DIM_INFO_T *)dim->format_dim_info;
/* Check for exact match of fileno/objid arrays
* to find identical objects in HDF5 file. */
#if H5_VERSION_GE(1,12,0)
int token_cmp;
if (H5Otoken_cmp(hdf5_var->hdf_datasetid, &hdf5_var->dimscale_hdf5_objids[d].token, &hdf5_dim->hdf5_objid.token, &token_cmp) < 0)
return NC_EHDFERR;
if (hdf5_var->dimscale_hdf5_objids[d].fileno == hdf5_dim->hdf5_objid.fileno &&
token_cmp == 0)
#else
if (hdf5_var->dimscale_hdf5_objids[d].fileno[0] == hdf5_dim->hdf5_objid.fileno[0] &&
hdf5_var->dimscale_hdf5_objids[d].objno[0] == hdf5_dim->hdf5_objid.objno[0] &&
hdf5_var->dimscale_hdf5_objids[d].fileno[1] == hdf5_dim->hdf5_objid.fileno[1] &&
hdf5_var->dimscale_hdf5_objids[d].objno[1] == hdf5_dim->hdf5_objid.objno[1])
#endif
{
LOG((4, "%s: for dimension %d, found dim %s", __func__,
d, dim->hdr.name));
var->dimids[d] = dim->hdr.id;
var->dim[d] = dim;
finished = NC_TRUE;
break;
}
} /* next dim */
} /* next grp */
LOG((5, "%s: dimid for this dimscale is %d", __func__,
var->type_info->hdr.id));
} /* next var->dim */
}
/* No dimscales for this var! Invent phony dimensions. */
else
{
hid_t spaceid = 0;
hsize_t *h5dimlen = NULL, *h5dimlenmax = NULL;
int dataset_ndims;
/* Find the space information for this dimension. */
if ((spaceid = H5Dget_space(hdf5_var->hdf_datasetid)) < 0)
return NC_EHDFERR;
/* Get the len of each dim in the space. */
if (var->ndims)
{
if (!(h5dimlen = malloc(var->ndims * sizeof(hsize_t))))
return NC_ENOMEM;
if (!(h5dimlenmax = malloc(var->ndims * sizeof(hsize_t))))
{
free(h5dimlen);
return NC_ENOMEM;
}
if ((dataset_ndims = H5Sget_simple_extent_dims(spaceid, h5dimlen,
h5dimlenmax)) < 0) {
free(h5dimlenmax);
free(h5dimlen);
return NC_EHDFERR;
}
if (dataset_ndims != var->ndims) {
free(h5dimlenmax);
free(h5dimlen);
return NC_EHDFERR;
}
}
else
{
/* Make sure it's scalar. */
if (H5Sget_simple_extent_type(spaceid) != H5S_SCALAR)
return NC_EHDFERR;
}
/* Release the space object. */
if (H5Sclose(spaceid) < 0) {
free(h5dimlen);
free(h5dimlenmax);
return NC_EHDFERR;
}
/* Create a phony dimension for each dimension in the
* dataset, unless there already is one the correct
* size. */
for (d = 0; d < var->ndims; d++)
{
int k;
int match;
/* Is there already a phony dimension of the correct size? */
for(match=-1,k=0;k<ncindexsize(grp->dim);k++) {
if((dim = (NC_DIM_INFO_T*)ncindexith(grp->dim,k)) == NULL) continue;
if ((dim->len == h5dimlen[d]) &&
((h5dimlenmax[d] == H5S_UNLIMITED && dim->unlimited) ||
(h5dimlenmax[d] != H5S_UNLIMITED && !dim->unlimited)))
{match = k; break;}
}
/* Didn't find a phony dim? Then create one. */
if (match < 0)
{
char phony_dim_name[NC_MAX_NAME + 1];
sprintf(phony_dim_name, "phony_dim_%d", grp->nc4_info->next_dimid);
LOG((3, "%s: creating phony dim for var %s", __func__, var->hdr.name));
if ((retval = nc4_dim_list_add(grp, phony_dim_name, h5dimlen[d], -1, &dim)))
{
free(h5dimlenmax);
free(h5dimlen);
return retval;
}
/* Create struct for HDF5-specific dim info. */
if (!(dim->format_dim_info = calloc(1, sizeof(NC_HDF5_DIM_INFO_T))))
return NC_ENOMEM;
if (h5dimlenmax[d] == H5S_UNLIMITED)
dim->unlimited = NC_TRUE;
}
/* The variable must remember the dimid. */
var->dimids[d] = dim->hdr.id;
var->dim[d] = dim;
} /* next dim */
/* Free the memory we malloced. */
free(h5dimlen);
free(h5dimlenmax);
}
}
}
return retval;
}
/**
* @internal Report information about an open HDF5 object. This is
* called on any still-open objects when a HDF5 file close is
* attempted.
*
* @param uselog If true, send output to LOG not stderr.
* @param id HDF5 ID of open object.
* @param type Type of HDF5 object, file, dataset, etc.
*
* @author Dennis Heimbigner
*/
void
reportobject(int uselog, hid_t id, unsigned int type)
{
char name[NC_HDF5_MAX_NAME];
ssize_t len;
const char* typename = NULL;
long long printid = (long long)id;
len = H5Iget_name(id, name, NC_HDF5_MAX_NAME);
if(len < 0) return;
name[len] = '\0';
switch (type) {
case H5F_OBJ_FILE: typename = "File"; break;
case H5F_OBJ_DATASET: typename = "Dataset"; break;
case H5F_OBJ_GROUP: typename = "Group"; break;
case H5F_OBJ_DATATYPE: typename = "Datatype"; break;
case H5F_OBJ_ATTR:
typename = "Attribute";
len = H5Aget_name(id, NC_HDF5_MAX_NAME, name);
if(len < 0) len = 0;
name[len] = '\0';
break;
default: typename = "<unknown>"; break;
}
#ifdef LOGGING
if(uselog) {
LOG((0,"Type = %s(%lld) name='%s'",typename,printid,name));
} else
#endif
{
fprintf(stderr,"Type = %s(%lld) name='%s'",typename,printid,name);
}
}
/**
* @internal
*
* @param uselog
* @param fid HDF5 ID.
* @param ntypes Number of types.
* @param otypes Pointer that gets number of open types.
*
* @author Dennis Heimbigner
*/
static void
reportopenobjectsT(int uselog, hid_t fid, int ntypes, unsigned int* otypes)
{
int t,i;
ssize_t ocount;
size_t maxobjs = -1;
hid_t* idlist = NULL;
/* Always report somehow */
#ifdef LOGGING
if(uselog)
LOG((0,"\nReport: open objects on %lld",(long long)fid));
else
#endif
fprintf(stdout,"\nReport: open objects on %lld\n",(long long)fid);
maxobjs = H5Fget_obj_count(fid,H5F_OBJ_ALL);
if(idlist != NULL) free(idlist);
idlist = (hid_t*)malloc(sizeof(hid_t)*maxobjs);
for(t=0;t<ntypes;t++) {
unsigned int ot = otypes[t];
ocount = H5Fget_obj_ids(fid,ot,maxobjs,idlist);
for(i=0;i<ocount;i++) {
hid_t o = idlist[i];
reportobject(uselog,o,ot);
}
}
if(idlist != NULL) free(idlist);
}
/**
* @internal Report open objects.
*
* @param uselog
* @param fid HDF5 file ID.
*
* @author Dennit Heimbigner
*/
void
reportopenobjects(int uselog, hid_t fid)
{
unsigned int OTYPES[5] = {H5F_OBJ_FILE, H5F_OBJ_DATASET, H5F_OBJ_GROUP,
H5F_OBJ_DATATYPE, H5F_OBJ_ATTR};
reportopenobjectsT(uselog, fid ,5, OTYPES);
}
/**
* @internal Report open objects given a pointer to NC_FILE_INFO_T object
*
* @param h5 file object
*
* @author Dennis Heimbigner
*/
void
showopenobjects5(NC_FILE_INFO_T* h5)
{
NC_HDF5_FILE_INFO_T *hdf5_info;
assert(h5 && h5->format_file_info);
hdf5_info = (NC_HDF5_FILE_INFO_T *)h5->format_file_info;
fprintf(stderr,"===== begin showopenobjects =====\n");
reportopenobjects(0,hdf5_info->hdfid);
fprintf(stderr,"===== end showopenobjects =====\n");
fflush(stderr);
}
/**
* @internal Report open objects given an ncid
* Defined to support user or gdb level call.
*
* @param ncid file id
*
* @author Dennis Heimbigner
*/
void
showopenobjects(int ncid)
{
NC_FILE_INFO_T* h5 = NULL;
/* Find our metadata for this file. */
if (nc4_find_nc_grp_h5(ncid, NULL, NULL, &h5) != NC_NOERR)
fprintf(stderr,"failed\n");
else
showopenobjects5(h5);
fflush(stderr);
}
/**
* @internal Get HDF5 library version.
*
* @param major Pointer that gets major version number.
* @param minor Pointer that gets minor version number.
* @param release Pointer that gets release version number.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned error.
* @author Dennis Heimbigner
*/
int
NC4_hdf5get_libversion(unsigned* major,unsigned* minor,unsigned* release)
{
if(H5get_libversion(major,minor,release) < 0)
return NC_EHDFERR;
return NC_NOERR;
}
/**
* @internal Get HDF5 superblock version.
*
* @param h5 Pointer to HDF5 file info struct.
* @param idp Pointer that gets superblock version.
*
* @returns NC_NOERR No error.
* @returns NC_EHDFERR HDF5 returned error.
* @author Dennis Heimbigner
*/
int
NC4_hdf5get_superblock(struct NC_FILE_INFO* h5, int* idp)
{
NC_HDF5_FILE_INFO_T *hdf5_info;
int stat = NC_NOERR;
unsigned super;
hid_t plist = -1;
assert(h5 && h5->format_file_info);
hdf5_info = (NC_HDF5_FILE_INFO_T *)h5->format_file_info;
if((plist = H5Fget_create_plist(hdf5_info->hdfid)) < 0)
{stat = NC_EHDFERR; goto done;}
if(H5Pget_version(plist, &super, NULL, NULL, NULL) < 0)
{stat = NC_EHDFERR; goto done;}
if(idp) *idp = (int)super;
done:
if(plist >= 0) H5Pclose(plist);
return stat;
}
static int NC4_strict_att_exists(NC_FILE_INFO_T*);
static int NC4_walk(hid_t, int*);
/**
* @internal Determine whether file is netCDF-4.
*
* We define a file as being from netcdf-4 if any of the following
* are true:
* 1. NCPROPS attribute exists in root group
* 2. NC3_STRICT_ATT_NAME exists in root group
* 3. any of NC_ATT_REFERENCE_LIST, NC_ATT_CLASS,
* NC_ATT_DIMENSION_LIST, NC_ATT_NAME,
* NC_ATT_COORDINATES, NC_DIMID_ATT_NAME
* exist anywhere in the file; note that this
* requires walking the file.
* @note WARNINGS:
* 1. False negatives are possible for a small subset of netcdf-4
* created files; especially if the file looks like a simple
netcdf classic file.
* 2. Deliberate falsification in the file can be used to cause
* a false positive.
*
* @param h5 Pointer to HDF5 file info struct.
*
* @returns NC_NOERR No error.
* @author Dennis Heimbigner.
*/
int
NC4_isnetcdf4(struct NC_FILE_INFO* h5)
{
int stat;
int isnc4 = 0;
int exists;
int count;
/* Look for NC3_STRICT_ATT_NAME */
exists = NC4_strict_att_exists(h5);
if(exists)
goto done;
/* attribute did not exist */
/* => last resort: walk the HDF5 file looking for markers */
count = 0;
stat = NC4_walk(((NC_HDF5_GRP_INFO_T *)(h5->root_grp->format_grp_info))->hdf_grpid,
&count);
if(stat != NC_NOERR)
isnc4 = 0;
else /* Threshold is at least two matches */
isnc4 = (count >= 2);
done:
return isnc4;
}
/**
* @internal See if the NC3 strict attribute exists.
*
* @param h5 Pointer to HDF5 file info struct.
*
* @returns 1 if error || exists; 0 otherwise
* @author Dennis Heimbigner.
*/
static int
NC4_strict_att_exists(NC_FILE_INFO_T *h5)
{
hid_t grpid = -1;
htri_t attr_exists;
/* Get root group ID. */
grpid = ((NC_HDF5_GRP_INFO_T *)(h5->root_grp->format_grp_info))->hdf_grpid;
/* See if the NC3_STRICT_ATT_NAME attribute exists */
if ((attr_exists = H5Aexists(grpid, NC3_STRICT_ATT_NAME)) < 0)
return 1;
return (attr_exists?1:0);
}
/**
* @internal Walk group struct.
*
* @param gid HDF5 ID of starting group.
* @param countp Pointer that gets count.
*
* @returns NC_NOERR No error.
* @author Dennis Heimbigner
*/
static int
NC4_walk(hid_t gid, int* countp)
{
int ncstat = NC_NOERR;
int i,j,na;
ssize_t len;
hsize_t nobj;
herr_t err;
int otype;
hid_t grpid, dsid;
char name[NC_HDF5_MAX_NAME];
/* walk group members of interest */
err = H5Gget_num_objs(gid, &nobj);
if(err < 0) return err;
for(i = 0; i < nobj; i++) {
/* Get name & kind of object in the group */
len = H5Gget_objname_by_idx(gid,(hsize_t)i,name,(size_t)NC_HDF5_MAX_NAME);
if(len < 0) return len;
otype = H5Gget_objtype_by_idx(gid,(size_t)i);
switch(otype) {
case H5G_GROUP:
grpid = H5Gopen1(gid,name);
NC4_walk(grpid,countp);
H5Gclose(grpid);
break;
case H5G_DATASET: /* variables */
/* Check for phony_dim */
if(strcmp(name,"phony_dim")==0)
*countp = *countp + 1;
dsid = H5Dopen1(gid,name);
na = H5Aget_num_attrs(dsid);
for(j = 0; j < na; j++) {
hid_t aid = H5Aopen_idx(dsid,(unsigned int) j);
if(aid >= 0) {
const NC_reservedatt* ra;
ssize_t len = H5Aget_name(aid, NC_HDF5_MAX_NAME, name);
if(len < 0) return len;
/* Is this a netcdf-4 marker attribute */
/* Is this a netcdf-4 marker attribute */
ra = NC_findreserved(name);
if(ra != NULL)
*countp = *countp + 1;
}
H5Aclose(aid);
}
H5Dclose(dsid);
break;
default:/* ignore */
break;
}
}
return ncstat;
}
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