/// <summary>
///
/// </summary>
/// <param name="headersOnly"></param>
/// <param name="blockStart">Inclusive block count</param>
/// <param name="blockEnd">Exclusive block count</param>
/// <returns></returns>
public IEnumerable <StoredBlock> Enumerate(bool headersOnly, int blockCountStart, int count = 999999999)
{
int blockCount = 0;
DiskBlockPos start = null;
foreach (var block in Enumerate(true, null))
{
if (blockCount == blockCountStart)
{
start = block.BlockPosition;
}
blockCount++;
}
if (start == null)
{
yield break;
}
int i = 0;
foreach (var result in Enumerate(headersOnly, new DiskBlockPosRange(start)))
{
if (i >= count)
{
break;
}
yield return(result);
i++;
}
}
public StoredItem(uint magic, T item, DiskBlockPos position)
{
_BlockPosition = position;
_Item = item;
_Header.Magic = magic;
_Header.ItemSize = (uint)item.GetSerializedSize();
}
protected override StoredBlock ReadStoredItem(Stream stream, DiskBlockPos pos)
{
StoredBlock block = new StoredBlock(Network, pos);
block.ParseSkipBlockContent = headerOnly;
block.ReadWrite(stream, false);
return(block);
}
protected DiskBlockPos SeekEnd(FileLock @lock)
{
if (_last != null)
{
return(_last);
}
_last = SeekEnd();
return(_last);
}
protected override StoredItem <BlockUndo> CreateStoredItem(BlockUndo item, DiskBlockPos position)
{
var stored = new StoredItem <BlockUndo>(Network.Magic, item, position);
stored.HasChecksum = true;
if (item.CalculatedChecksum == null)
{
throw new InvalidOperationException("A block undo should have an calculated checksum with ComputeChecksum");
}
stored.Checksum = item.CalculatedChecksum;
return(stored);
}
public DiskBlockPos Append(TItem item)
{
using (var @lock = CreateLock(FileLockType.ReadWrite))
{
DiskBlockPos position = SeekEnd(@lock);
if (position.Position > MaxFileSize)
{
position = new DiskBlockPos(position.File + 1, 0);
}
var stored = CreateStoredItem(item, position);
Write(stored);
position = new DiskBlockPos(position.File, position.Position + stored.GetStorageSize());
_last = position;
return(stored.BlockPosition);
}
}
/// <summary>
/// Represent a disk block range
/// </summary>
/// <param name="begin">Beginning of the range (included)</param>
/// <param name="end">End of the range (excluded)</param>
public DiskBlockPosRange(DiskBlockPos begin = null, DiskBlockPos end = null)
{
if (begin == null)
{
begin = DiskBlockPos.Begin;
}
if (end == null)
{
end = DiskBlockPos.End;
}
_Begin = begin;
_End = end;
if (end <= begin)
{
throw new ArgumentException("End should be more than begin");
}
}
public StoredItem(Network expectedNetwork, DiskBlockPos position)
{
_Header = new StoredHeader(expectedNetwork);
_BlockPosition = position;
}
protected override StoredBlock CreateStoredItem(Block item, DiskBlockPos position)
{
return(new StoredBlock(Network.Magic, item, position));
}
public bool InRange(DiskBlockPos pos)
{
return(Begin <= pos && pos < End);
}
public StoredBlock(uint magic, Block block, DiskBlockPos blockPosition)
: base(magic, block, blockPosition)
{
}
public StoredBlock(Network expectedNetwork, DiskBlockPos position)
: base(expectedNetwork, position)
{
}
protected override StoredItem <BlockUndo> ReadStoredItem(System.IO.Stream stream, DiskBlockPos pos)
{
StoredItem <BlockUndo> item = new StoredItem <BlockUndo>(Network, pos);
item.HasChecksum = true;
item.ReadWrite(stream, false);
item.Item.CalculatedChecksum = item.Checksum;
return(item);
}
protected abstract TStoredItem ReadStoredItem(Stream stream, DiskBlockPos pos);
protected abstract TStoredItem CreateStoredItem(TItem item, DiskBlockPos position);
