protected override ChunkInfo GetChunkInfo(ulong[] chunkIndices)
{
// H5Dearray.c (H5D__earray_idx_get_addr)
/* Check for unlimited dim. not being the slowest-changing dim. */
ulong chunkIndex;
if (_unlimitedDim > 0)
{
var swizzledCoords = new ulong[this.ChunkRank];
/* Compute coordinate offset from scaled offset */
for (int i = 0; i < this.ChunkRank; i++)
{
swizzledCoords[i] = chunkIndices[i] * this.ChunkDims[i];
}
H5Utils.SwizzleCoords(swizzledCoords, _unlimitedDim);
/* Calculate the index of this chunk */
var swizzledScaledDims = swizzledCoords
.Select((swizzledCoord, i) => H5Utils.CeilDiv(swizzledCoord, _swizzledChunkDims[i]))
.ToArray();
chunkIndex = swizzledScaledDims.ToLinearIndexPrecomputed(_swizzledDownMaxChunkCounts);
}
else
{
/* Calculate the index of this chunk */
chunkIndex = chunkIndices.ToLinearIndexPrecomputed(this.DownMaxChunkCounts);
}
/* Check for filters on chunks */
if (this.Dataset.InternalFilterPipeline is not null)
{
var chunkSizeLength = H5Utils.ComputeChunkSizeLength(this.ChunkByteSize);
var element = this.GetElement(chunkIndex, reader =>
{
return(new FilteredDataBlockElement()
{
Address = this.Dataset.Context.Superblock.ReadOffset(reader),
ChunkSize = (uint)H5Utils.ReadUlong(reader, chunkSizeLength),
FilterMask = reader.ReadUInt32()
});
});
return(element is not null
? new ChunkInfo(element.Address, element.ChunkSize, element.FilterMask)
: ChunkInfo.None);
}
else
{
var element = this.GetElement(chunkIndex, reader =>
{
return(new DataBlockElement()
{
Address = this.Dataset.Context.Superblock.ReadOffset(reader)
});
});
return(element is not null
? new ChunkInfo(element.Address, this.ChunkByteSize, 0)
: ChunkInfo.None);
}
}
