public BlockStreamWriter(FragmentedFile file, long ordinal)
: this(file)
{
_current = _first = new FileBlock(file._blockSize, file._useAlignedIo);
_file.ReadBlock(ordinal, _current, file._blockSize, BlockFlags.ExternalBlock);
if ((_current.Flags & BlockFlags.ExternalBlock) != BlockFlags.ExternalBlock)
{
throw new InvalidOperationException();
}
if ((_current.Flags & BlockFlags.Temporary) == BlockFlags.Temporary)
{
_isNew = true;
_restore = null;
_current.Flags &= ~BlockFlags.Temporary;
}
else
{
_isNew = false;
_restore = _current.Clone();
_current.NextBlockId = 0;
}
_current.Length = 0;
}
private bool FreeBlock(long blockId, BlockFlags expected)
{
using (FileBlock first = new FileBlock(_blockSize, _useAlignedIo))
{
ReadBlock(blockId, first, FileBlock.HeaderSize, expected | BlockFlags.BlockDeleted);
if ((first.Flags & expected) != expected)
{
return(false);
}
using (FileBlock last = first.Clone())
{
while (last.NextBlockId != 0)
{
last.Flags = BlockFlags.BlockDeleted;
WriteBlock(last.BlockId, last, FileBlock.HeaderSize);
ReadBlock(last.NextBlockId, last, FileBlock.HeaderSize, BlockFlags.InternalBlock);
}
using (new SafeLock(_syncFreeBlock))
{
last.Flags = BlockFlags.BlockDeleted;
last.NextBlockId = _nextFree;
WriteBlock(last.BlockId, last, FileBlock.HeaderSize);
_nextFree = first.BlockId;
}
return(true);
}
}
}
public BlockStreamWriter(FragmentedFile file, long ordinal)
: this(file)
{
_current = _first = new FileBlock(file._blockSize, file._useAlignedIo);
_file.ReadBlock(ordinal, _current, file._blockSize, BlockFlags.ExternalBlock);
if ((_current.Flags & BlockFlags.ExternalBlock) != BlockFlags.ExternalBlock)
throw new InvalidOperationException();
if ((_current.Flags & BlockFlags.Temporary) == BlockFlags.Temporary)
{
_isNew = true;
_restore = null;
_current.Flags &= ~BlockFlags.Temporary;
}
else
{
_isNew = false;
_restore = _current.Clone();
_current.NextBlockId = 0;
}
_current.Length = 0;
}
private bool FreeBlock(long blockId, BlockFlags expected)
{
using (FileBlock first = new FileBlock(_blockSize, _useAlignedIo))
{
ReadBlock(blockId, first, FileBlock.HeaderSize, expected | BlockFlags.BlockDeleted);
if ((first.Flags & expected) != expected)
return false;
using (FileBlock last = first.Clone())
{
while (last.NextBlockId != 0)
{
last.Flags = BlockFlags.BlockDeleted;
WriteBlock(last.BlockId, last, FileBlock.HeaderSize);
ReadBlock(last.NextBlockId, last, FileBlock.HeaderSize, BlockFlags.InternalBlock);
}
using (new SafeLock(_syncFreeBlock))
{
last.Flags = BlockFlags.BlockDeleted;
last.NextBlockId = _nextFree;
WriteBlock(last.BlockId, last, FileBlock.HeaderSize);
_nextFree = first.BlockId;
}
return true;
}
}
}
