public Sop.DataBlock ReadBlockFromDisk(Algorithm.Collection.ICollectionOnDisk parent, long address, bool getForRemoval)
{
if (address >= 0)
{
var o = ((CollectionOnDisk)parent).Blocks[address];
if (o != null)
{
getForRemoval = true;
if (o.SizeOccupied > 0)
{
if (o.NextItemAddress >= 0 && o.Next == null)
{
o.Next = ReadBlockFromDisk(parent, o.NextItemAddress, getForRemoval);
}
return(o);
}
}
}
if (parent.FileStream.Length > address)
{
if (parent is LinkedListOnDisk)
{
((LinkedListOnDisk)parent).MoveTo(address);
}
Sop.DataBlock d = CreateBlock(parent.DataBlockSize);
d = ReadBlockFromDisk(parent, address, getForRemoval, getForRemoval, d);
if (!d.IsEmpty())
{
ReadBlock(parent, d, getForRemoval);
}
_readAheadBuffer.Clear();
return(d);
}
Sop.DataBlock r = CreateBlock(parent.DataBlockSize);
r.DataAddress = address;
return(r);
}
