public static unsafe void AddExternalDataset(long fileId, string datasetName, string absolutePrefix, H5DatasetAccess datasetAccess)
{
long res;
var bytesoftype = 4;
var dcpl_id = H5P.create(H5P.DATASET_CREATE);
var dapl_id = H5P.create(H5P.DATASET_ACCESS);
res = H5P.set_layout(dcpl_id, H5D.layout_t.CONTIGUOUS);
// a (more than one chunk in file)
var pathA = H5Utils.ConstructExternalFilePath(Path.Combine(absolutePrefix, $"{datasetName}_a.raw"), datasetAccess);
if (File.Exists(pathA))
{
File.Delete(pathA);
}
res = H5P.set_external(dcpl_id, pathA, new IntPtr(120), (ulong)(10 * bytesoftype));
res = H5P.set_external(dcpl_id, pathA, new IntPtr(80), (ulong)(10 * bytesoftype));
res = H5P.set_external(dcpl_id, pathA, new IntPtr(0), (ulong)(10 * bytesoftype));
// b (file size smaller than set size)
var pathB = H5Utils.ConstructExternalFilePath(Path.Combine(absolutePrefix, $"{datasetName}_b.raw"), datasetAccess);
if (File.Exists(pathB))
{
File.Delete(pathB);
}
res = H5P.set_external(dcpl_id, pathB, new IntPtr(0), (ulong)(10 * bytesoftype));
// c (normal file)
var pathC = H5Utils.ConstructExternalFilePath(Path.Combine(absolutePrefix, $"{datasetName}_c.raw"), datasetAccess);
if (File.Exists(pathC))
{
File.Delete(pathC);
}
res = H5P.set_external(dcpl_id, pathC, new IntPtr(0), (ulong)((TestData.MediumData.Length - 40) * bytesoftype));
// write data
if (datasetAccess.ExternalFilePrefix is not null)
{
H5P.set_efile_prefix(dapl_id, datasetAccess.ExternalFilePrefix);
}
TestUtils.Add(ContainerType.Dataset, fileId, "external", datasetName, H5T.NATIVE_INT32, TestData.MediumData.AsSpan(), apl: dapl_id, cpl: dcpl_id);
// truncate file b
using (var fileStream2 = File.OpenWrite(pathB))
{
fileStream2.SetLength(10);
};
res = H5P.close(dapl_id);
res = H5P.close(dcpl_id);
}