private long AllocBlock(FileBlock block, BlockFlags type)
{
using (new SafeLock(_syncFreeBlock))
{
long blockId = _nextFree;
if (blockId == 0 && _reallocSize > 0)
{
long fsize;
using (Stream s = _streamCache.Open(FileAccess.Read))
fsize = LastAllocated(s);
ResizeFile(fsize + _blockSize, fsize + _reallocSize);
blockId = _nextFree;
}
if (blockId <= 0)
{
throw new IOException();
}
using (Stream io = OpenBlock(FileAccess.Read, blockId))
block.Read(io, FileBlock.HeaderSize);
if ((block.BlockId & _maskOffset) != (blockId & _maskOffset) || (block.Flags & BlockFlags.BlockDeleted) == 0)
{
throw new InvalidDataException();
}
_nextFree = block.NextBlockId;
block.BlockId = blockId;
block.IncrementId(_maskVersion);
block.NextBlockId = 0;
block.Flags = type == BlockFlags.ExternalBlock ? (type | BlockFlags.Temporary) : type;
block.Length = 0;
WriteBlock(block.BlockId, block, FileBlock.HeaderSize);
return(block.BlockId);
}
}
private long AllocBlock(FileBlock block, BlockFlags type)
{
using (new SafeLock(_syncFreeBlock))
{
long blockId = _nextFree;
if (blockId == 0 && _reallocSize > 0)
{
long fsize;
using (Stream s = _streamCache.Open(FileAccess.Read))
fsize = LastAllocated(s);
ResizeFile(fsize + _blockSize, fsize + _reallocSize);
blockId = _nextFree;
}
if (blockId <= 0)
throw new IOException();
using (Stream io = OpenBlock(FileAccess.Read, blockId))
block.Read(io, FileBlock.HeaderSize);
if ((block.BlockId & _maskOffset) != (blockId & _maskOffset) || (block.Flags & BlockFlags.BlockDeleted) == 0)
throw new InvalidDataException();
_nextFree = block.NextBlockId;
block.BlockId = blockId;
block.IncrementId(_maskVersion);
block.NextBlockId = 0;
block.Flags = type == BlockFlags.ExternalBlock ? (type | BlockFlags.Temporary) : type;
block.Length = 0;
WriteBlock(block.BlockId, block, FileBlock.HeaderSize);
return block.BlockId;
}
}
