public FixedArrayDataBlock(H5BinaryReader reader, Superblock superblock, FixedArrayHeader header, uint chunkSizeLength)
{
// H5FAdblock.c (H5FA__dblock_alloc)
this.ElementsPerPage = 1UL << header.PageBits;
this.PageCount = 0UL;
var pageBitmapSize = 0UL;
if (header.EntriesCount > this.ElementsPerPage)
{
/* Compute number of pages */
this.PageCount = (header.EntriesCount + this.ElementsPerPage - 1) / this.ElementsPerPage;
/* Compute size of 'page init' flag array, in bytes */
pageBitmapSize = (this.PageCount + 7) / 8;
}
// signature
var signature = reader.ReadBytes(4);
H5Utils.ValidateSignature(signature, FixedArrayDataBlock.Signature);
// version
this.Version = reader.ReadByte();
// client ID
this.ClientID = (ClientID)reader.ReadByte();
// header address
this.HeaderAddress = superblock.ReadOffset(reader);
// page bitmap
if (this.PageCount > 0)
{
this.PageBitmap = reader.ReadBytes((int)pageBitmapSize);
}
// elements
else
{
this.Elements = ArrayIndexUtils.ReadElements(reader, superblock, header.EntriesCount, this.ClientID, chunkSizeLength);
}
// checksum
this.Checksum = reader.ReadUInt32();
}
private void ReadFixedArray(Span <byte> buffer, ulong chunkSize)
{
var chunkSizeLength = this.ComputeChunkSizeLength(chunkSize);
var header = new FixedArrayHeader(this.Context.Reader, this.Context.Superblock, chunkSizeLength);
var dataBlock = header.DataBlock;
IEnumerable <DataBlockElement> elements;
if (dataBlock.PageCount > 0)
{
var pages = new List <DataBlockPage>((int)dataBlock.PageCount);
for (int i = 0; i < (int)dataBlock.PageCount; i++)
{
var page = new DataBlockPage(this.Context.Reader, this.Context.Superblock, dataBlock.ElementsPerPage, dataBlock.ClientID, chunkSizeLength);
pages.Add(page);
}
elements = pages.SelectMany(page => page.Elements);
}
else
{
elements = dataBlock.Elements.AsEnumerable();
}
var offset = 0UL;
var index = 0UL;
var enumerator = elements.GetEnumerator();
for (ulong i = 0; i < header.EntriesCount; i++)
{
enumerator.MoveNext();
var element = enumerator.Current;
// if page/element is initialized (see also datablock.PageBitmap)
if (element.Address > 0)
{
this.SeekSliceAndReadChunk(offset, chunkSize, element.ChunkSize, element.Address, buffer);
}
offset += chunkSize;
index++;
}
}
public FixedArrayDataBlock(H5BinaryReader reader, Superblock superblock, FixedArrayHeader header, Func <H5BinaryReader, T> decode)
{
// H5FAdblock.c (H5FA__dblock_alloc)
this.ElementsPerPage = 1UL << header.PageBits;
this.PageCount = 0UL;
var pageBitmapSize = 0UL;
if (header.EntriesCount > this.ElementsPerPage)
{
/* Compute number of pages */
this.PageCount = (header.EntriesCount + this.ElementsPerPage - 1) / this.ElementsPerPage;
/* Compute size of 'page init' flag array, in bytes */
pageBitmapSize = (this.PageCount + 7) / 8;
}
// signature
var signature = reader.ReadBytes(4);
H5Utils.ValidateSignature(signature, FixedArrayDataBlock <T> .Signature);
// version
this.Version = reader.ReadByte();
// client ID
this.ClientID = (ClientID)reader.ReadByte();
// header address
this.HeaderAddress = superblock.ReadOffset(reader);
// page bitmap
if (this.PageCount > 0)
{
this.PageBitmap = reader.ReadBytes((int)pageBitmapSize);
this.Elements = new T[0];
}
// elements
else
{
this.PageBitmap = new byte[0];
this.Elements = Enumerable
.Range(0, (int)header.EntriesCount)
.Select(i => decode(reader))
.ToArray();
}
// checksum
this.Checksum = reader.ReadUInt32();
// last page element count
if (header.EntriesCount % this.ElementsPerPage == 0)
{
this.LastPageElementCount = this.ElementsPerPage;
}
else
{
this.LastPageElementCount = header.EntriesCount % this.ElementsPerPage;
}
}
