/*-------------------------------------------------------------------------
* Function: H5LD_get_dset_elmts
*
* Purpose: To retrieve selected data from the dataset
*
* Return: Success: 0
* Failure: negative
*
* Programmer: Vailin Choi; August 2010
*
*-------------------------------------------------------------------------
*/
static herr_t
H5LD_get_dset_elmts(hid_t did, const hsize_t *prev_dims, const hsize_t *cur_dims,
const char *fields, void *buf)
{
hid_t dtid = -1, tid = -1; /* Dataset type id */
hid_t sid = -1, mid = -1; /* Dataspace and memory space id */
hssize_t snum_elmts; /* Number of dataset elements in the selection (signed) */
hsize_t num_elmts; /* Number of dataset elements in the selection */
hsize_t start[H5S_MAX_RANK];/* Starting offset */
hsize_t count[H5S_MAX_RANK];/* ??offset */
H5LD_memb_t **listv = NULL; /* Vector for storing information in "fields" */
char *dup_fields = NULL; /* A copy of "fields" */
char *sav_buf = NULL; /* Saved pointer temporary buffer */
unsigned ctr; /* Counter for # of curr_dims > prev_dims */
int ndims; /* Number of dimensions for the dataset */
int i; /* Local index variable */
herr_t ret_value = FAIL; /* Return value */
/* Verify parameters */
if(prev_dims == NULL || cur_dims == NULL || buf == NULL)
goto done;
/* Get dataset's dataspace */
if((sid = H5Dget_space(did)) < 0)
goto done;
/* Get the number of dimensions */
if((ndims = H5Sget_simple_extent_ndims(sid)) < 0)
goto done;
/* Verify that cur_dims must have one dimension whose size is greater than prev_dims */
HDmemset(start, 0, sizeof start);
HDmemset(count, 0, sizeof count);
ctr = 0;
for(i = 0; i < ndims; i++)
if(cur_dims[i] > prev_dims[i]) {
++ctr;
count[i] = cur_dims[i] - prev_dims[i];
start[i] = prev_dims[i];
} /* end if */
else { /* < or = */
start[i] = 0;
count[i] = MIN(prev_dims[i], cur_dims[i]);
} /* end else */
if(!ctr)
goto done;
if(ctr == 1) { /* changes for only one dimension */
/* Make the selection in the dataset based on "cur_dims" and "prev_dims" */
if(H5Sselect_hyperslab(sid, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
goto done;
} /* end if */
else { /* changes for more than one dimensions */
HDmemset(start, 0, sizeof start);
/* Make the selection in the dataset based on "cur_dims" and "prev_dims" */
if(H5Sselect_hyperslab(sid, H5S_SELECT_SET, start, NULL, cur_dims, NULL) < 0)
goto done;
if(H5Sselect_hyperslab(sid, H5S_SELECT_NOTB, start, NULL, prev_dims, NULL) < 0)
goto done;
} /* end else */
/* Get the number of elements in the selection */
if(0 == (snum_elmts = H5Sget_select_npoints(sid)))
goto done;
num_elmts = (hsize_t)snum_elmts;
/* Create the memory space for the selection */
if((mid = H5Screate_simple(1, &num_elmts, NULL)) < 0)
goto done;
/* Get the native datatype size */
if((dtid = H5Dget_type(did)) < 0)
goto done;
if((tid = H5Tget_native_type(dtid, H5T_DIR_DEFAULT)) < 0)
goto done;
if(fields == NULL) { /* nothing in "fields" */
/* Read and store all the elements in "buf" */
if(H5Dread(did, tid, mid, sid, H5P_DEFAULT, buf) < 0)
goto done;
} /* end if */
else { /* "fields" is specified */
unsigned char *buf_p = (unsigned char *)buf; /* Pointer to the destination buffer */
char *tmp_buf; /* Temporary buffer for data read */
size_t tot_tsize; /* Total datatype size */
size_t len; /* Estimate the number of comma-separated fields in "fields" */
/* should be a compound datatype if "fields" exists */
if(H5Tget_class(tid) != H5T_COMPOUND)
goto done;
/* Get the total size of the dataset's datatypes */
if(0 == (tot_tsize = H5LD_get_dset_type_size(did, NULL)))
goto done;
/* Allocate memory for reading in the elements in the dataset selection */
if(NULL == (sav_buf = tmp_buf = (char *)HDcalloc((size_t)num_elmts, tot_tsize)))
goto done;
/* Read the dataset elements in the selection */
if(H5Dread(did, tid, mid, sid, H5P_DEFAULT, tmp_buf) < 0)
goto done;
/* Make a copy of "fields" */
if(NULL == (dup_fields = HDstrdup(fields)))
goto done;
/* Allocate memory for the vector of H5LD_memb_t pointers */
len = (HDstrlen(fields) / 2) + 2;
if(NULL == (listv = (H5LD_memb_t **)HDcalloc(len, sizeof(H5LD_memb_t *))))
goto done;
/* Process and store information for "fields" */
if(H5LD_construct_vector(dup_fields, listv, tid) < 0)
goto done;
/* Copy data for each dataset element in the selection */
for(i = 0; i < (int)num_elmts; i++) {
int j; /* Local index variable */
/* Copy data for "fields" to the input buffer */
for(j = 0; listv[j] != NULL; j++) {
HDmemcpy(buf_p, tmp_buf + listv[j]->tot_offset, listv[j]->last_tsize);
buf_p += listv[j]->last_tsize;
} /* end for */
tmp_buf += tot_tsize;
} /* end for */
/* Clean up the vector of H5LD_memb_t structures */
H5LD_clean_vector(listv);
} /* end else */
/* Indicate success */
ret_value = SUCCEED;
done:
H5E_BEGIN_TRY
H5Tclose(dtid);
H5Tclose(tid);
H5Sclose(sid);
H5Sclose(mid);
H5E_END_TRY
/* Free the array of H5LD_memb_t pointers */
if(listv)
HDfree(listv);
/* Free memory */
if(dup_fields)
HDfree(dup_fields);
if(sav_buf)
HDfree(sav_buf);
return(ret_value);
} /* H5LD_get_dset_elmts() */
/*-------------------------------------------------------------------------
* Function: process_cmpd_fields
*
* Purpose: To check whether the fields selected in "g_list_of_fields"
* are valid fields associated with the dataset.
*
* Return: 0 on success; negative on failure
*
* Programmer: Vailin Choi; August 2010
*
*-------------------------------------------------------------------------
*/
static herr_t
process_cmpd_fields(hid_t fid, char *dsetname)
{
hid_t did=-1; /* dataset id */
hid_t dtid=-1, tid=-1; /* dataset's data type id */
size_t len; /* number of comma-separated fields in "g_list_of_fields" */
herr_t ret_value = SUCCEED; /* Return value */
HDassert(g_list_of_fields && *g_list_of_fields);
/* Open the dataset */
if((did = H5Dopen2(fid, dsetname, H5P_DEFAULT)) < 0) {
error_msg("error in opening dataset \"%s\"\n", dsetname);
ret_value = FAIL;
goto done;
}
/* Get the dataset's datatype */
if(((dtid = H5Dget_type(did)) < 0) || (tid = H5Tget_native_type(dtid, H5T_DIR_DEFAULT)) < 0) {
error_msg("error in getting dataset's datatype\n");
ret_value = FAIL;
goto done;
}
/* Check to make sure that the dataset's datatype is compound type */
if(H5Tget_class(dtid) != H5T_COMPOUND) {
error_msg("dataset should be compound type for <list_of_fields>\n");
ret_value = FAIL;
goto done;
}
/* Make a copy of "g_list_of_fields" */
if((g_dup_fields = HDstrdup(g_list_of_fields)) == NULL) {
error_msg("error in duplicating g_list_of_fields\n");
ret_value = FAIL;
goto done;
}
/* Estimate the number of comma-separated fields in "g_list of_fields" */
len = HDstrlen(g_list_of_fields)/2 + 2;
/* Allocate memory for a list vector of H5LD_memb_t structures to store "g_list_of_fields" info */
if((g_listv = (H5LD_memb_t **)HDcalloc(len, sizeof(H5LD_memb_t *))) == NULL) {
error_msg("error in allocating memory for H5LD_memb_t\n");
ret_value = FAIL;
goto done;
}
/* Process and store info for "g_listv" */
if(H5LD_construct_vector(g_dup_fields, g_listv, tid) < 0) {
error_msg("error in processing <list_of_fields>\n");
ret_value = FAIL;
goto done;
}
/* Will free memory for g_listv and g_dup_fields when exiting from h5watch */
done:
/* Closing */
H5E_BEGIN_TRY
H5Tclose(dtid);
H5Tclose(tid);
H5Dclose(did);
H5E_END_TRY
return(ret_value);
} /* process_cmpd_fields() */
/*-------------------------------------------------------------------------
* Function: H5LD_get_dset_type_size
*
* Purpose: To return the size of the dataset's datatype in bytes
* null "fields": return the size of the dataset's datatype
* non-null "fields": return the size of the dataset's datatype
* with respect to the selection in "fields"
*
* Return: Success: size of the dataset's datatype
* Failure: 0 (valid datatypes are never zero size)
*
* Programmer: Vailin Choi; March 2010
*
*-------------------------------------------------------------------------
*/
static size_t
H5LD_get_dset_type_size(hid_t did, const char *fields)
{
hid_t dset_tid = -1; /* Dataset's type identifier */
hid_t tid = -1; /* Native Type identifier */
H5LD_memb_t **listv = NULL; /* Vector for storing information in "fields" */
char *dup_fields = NULL; /* A copy of "fields" */
size_t ret_value = 0; /* Return value */
/* Get the datatype of the dataset */
if((dset_tid = H5Dget_type(did)) < 0)
goto done;
if((tid = H5Tget_native_type(dset_tid, H5T_DIR_DEFAULT)) < 0)
goto done;
if(fields == NULL) /* If no "fields" is specified */
ret_value = H5Tget_size(tid);
else { /* "fields" are specified */
size_t len; /* Estimate the number of comma-separated fields in "fields" */
size_t tot = 0; /* Data type size of all the fields in "fields" */
int n = 0, num = 0; /* Local index variables */
HDassert(fields && *fields);
/* Should be a compound datatype if "fields" exists */
if(H5Tget_class(dset_tid) != H5T_COMPOUND)
goto done;
/* Get a copy of "fields" */
if(NULL == (dup_fields = HDstrdup(fields)))
goto done;
/* Allocate memory for a list of H5LD_memb_t pointers to store "fields" info */
len = (HDstrlen(fields) / 2) + 2;
if(NULL == (listv = (H5LD_memb_t **)HDcalloc(len, sizeof(H5LD_memb_t *))))
goto done;
/* Process and store info for "fields" */
if((num = H5LD_construct_vector(dup_fields, listv/*OUT*/, tid)) < 0)
goto done;
/* Sum up the size of all the datatypes in "fields" */
for(n = 0; n < num; n++)
tot += listv[n]->last_tsize;
/* Clean up the vector of H5LD_memb_t structures */
H5LD_clean_vector(listv);
/* Return the total size */
ret_value = tot;
} /* end else */
done:
H5E_BEGIN_TRY
H5Tclose(tid);
H5Tclose(dset_tid);
H5E_END_TRY
/* Free the array of H5LD_memb_t pointers */
if(listv)
HDfree(listv);
/* Free memory */
if(dup_fields)
HDfree(dup_fields);
return(ret_value);
} /* H5LD_get_dset_type_size() */
