private HashSet <int> ReadFreeBlocks()
{
var blockId = MasterBlockData.FreeListBlockId;
if (blockId == 0)
{
return(new HashSet <int>());
}
var chainedBlock = ReadChainedBlock(blockId);
var blocks = new HashSet <int>();
using (var memoryStream = new MemoryStream(chainedBlock.Data, false))
{
using (var reader = new BinaryReader(memoryStream))
{
var count = reader.ReadInt32();
for (var i = 0; i < count; ++i)
{
blocks.Add(reader.ReadInt32());
}
}
}
// The current blocks holding the free list must not be overwritten in this session
foreach (var id in chainedBlock.BlockIds)
{
GarbageBlocks.Add(id);
blocks.Remove(id);
}
return(blocks);
}
public void FreeBlock(int blockId)
{
VerifyValidDataBlock(blockId);
IsChanged = true;
var chainedBlock = _blocks[blockId];
if (AllocatedBlocks.Contains(blockId) || InitialFreeBlocks.Contains(blockId))
{
foreach (var id in chainedBlock.BlockIds)
{
FreeBlocks.Add(id);
}
}
else
{
foreach (var id in chainedBlock.BlockIds)
{
GarbageBlocks.Add(id);
}
}
_blocks.Remove(blockId);
}
