public Guid Write(byte[] data)
{
var offset = 0;
byte[] buffer = null;
var id = Guid.Empty;
while (offset < data.Length)
{
var nextBlockSize = Math.Min(data.Length - offset, BinaryDataStorageClass.MaxBufferSize);
if (buffer == null || buffer.Length != nextBlockSize)
{
buffer = new byte[nextBlockSize];
}
Array.Copy(data, offset, buffer, 0, nextBlockSize);
var nextBlock = new BinaryDataStorageClass
{
Bytes = buffer,
Id = Guid.NewGuid(),
NextBlock = id,
RemainingBytes = offset + nextBlockSize
};
_file.Write(nextBlock);
offset += nextBlockSize;
id = nextBlock.Id;
}
return(id);
}
public void Delete(Guid id)
{
var ids = new List <Guid>();
var nextId = id;
var block = new BinaryDataStorageClass();
do
{
block.Id = nextId;
if (!_file.Get(block))
{
break;
}
ids.Add(nextId);
nextId = block.NextBlock;
} while (block.NextBlock != null);
ids.Reverse();
foreach (var deleteId in ids)
{
block.Id = deleteId;
_file.Delete(block);
}
}
public bool Exists(Guid id)
{
var block = new BinaryDataStorageClass {
Id = id
};
return(_file.Get(block));
}
public byte[] Read(Guid id)
{
byte[] buffer = null;
do
{
var block = new BinaryDataStorageClass {
Id = id
};
if (!_file.Get(block))
{
return(null);
}
if (buffer == null)
{
buffer = new byte[block.RemainingBytes];
}
Array.Copy(block.Bytes, 0, buffer, block.RemainingBytes - block.Bytes.Length, block.Bytes.Length);
id = block.NextBlock;
}while (id != Guid.Empty);
return(buffer);
}
