Hi all,
I've just found a weird construct in one of our CGNS/HDF5 files (part of h5dump
below).
We have an external link to another file and inside the external link itself
there is a 'local' group.
The group inside actually masks a group of same name in the target file (see
bc_1_8 below).
We did obtain such a file because of a bug in our application, it uses to
replace a group with an external
link having the same name but without deleting the original group.
I wonder if:
1. yes this is the expected behavior, the link is always read first so that you
can use this feature to partly mask the target sub-tree
2. no, this file shows a bad construct, should be corrected and HDF5 should
forbid such
3. side-effect, it is not a feature but you can build such a file, as long as
we do not change implementation the side effect is... a feature (oups!)
-MP-
EXTERNAL_LINK " link" {
TARGETFILE "mesh.cgns"
TARGETPATH "/Base#1/Zone#1/ZoneGridConnectivity"
GROUP "/Base#1/Zone#1/ZoneGridConnectivity" {
ATTRIBUTE "flags" {
DATATYPE H5T_STD_I32LE
DATASPACE SIMPLE { ( 1 ) / ( 1 ) }
DATA {
(0): 0
}
}
ATTRIBUTE "label" {
DATATYPE H5T_STRING {
STRSIZE 33;
STRPAD H5T_STR_NULLTERM;
CSET H5T_CSET_ASCII;
CTYPE H5T_C_S1;
}
DATASPACE SCALAR
DATA {
(0): "ZoneGridConnectivity_t"
}
}
ATTRIBUTE "name" {
DATATYPE H5T_STRING {
STRSIZE 33;
STRPAD H5T_STR_NULLTERM;
CSET H5T_CSET_ASCII;
CTYPE H5T_C_S1;
}
DATASPACE SCALAR
DATA {
(0): "ZoneGridConnectivity"
}
}
ATTRIBUTE "type" {
DATATYPE H5T_STRING {
STRSIZE 3;
STRPAD H5T_STR_NULLTERM;
CSET H5T_CSET_ASCII;
CTYPE H5T_C_S1;
}
DATASPACE SCALAR
DATA {
(0): "MT"
}
}
GROUP "bc_1_8" {
ATTRIBUTE "flags" {
DATATYPE H5T_STD_I32LE
DATASPACE SIMPLE { ( 1 ) / ( 1 ) }
DATA {
(0): 0
}
}
}
--
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-- Marc POINOT [ONERA/DMFN] Tel:+33.1.46.73.42.84
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