public bool DeleteKeyHF(string key)
{
lock (_lock)
{
int alloc;
if (_keys.Get(key, out alloc))
{
if (_isDirty == false)
{
WriteDirtyFile();
}
byte[] keybytes = Helper.GetBytes(key);
AllocationBlock ab = FillAllocationBlock(alloc);
ab.keylen = (byte)keybytes.Length;
_keys.RemoveKey(key);// remove key from index
// write ab
ab.deleteKey = true;
ab.datalength = 0;
byte[] header = CreateAllocHeader(ab, keybytes);
_datastore.SeekBlock(ab.blocknumber);
_datastore.WriteBlockBytes(header, 0, header.Length);
// free old data blocks
_datastore.FreeBlocks(ab.Blocks);
return(true);
}
}
return(false);
}
private int internalSave(byte[] keybytes, byte[] data, AllocationBlock ab)
{
ab.Blocks = new List <int>();
int firstblock = _datastore.GetFreeBlockNumber();
ab.Blocks.Add(firstblock);
int blocknum = firstblock;
byte[] header = CreateAllocHeader(ab, keybytes);
int dblocksize = _BlockSize - header.Length;
int offset = 0;
// compute data block count
int datablockcount = (data.Length / dblocksize) + 1;
// save data blocks
int counter = 0;
int len = data.Length;
while (datablockcount > 0)
{
datablockcount--;
int next = 0;
if (datablockcount > 0)
{
next = _datastore.GetFreeBlockNumber();
}
Buffer.BlockCopy(Helper.GetBytes(counter, false), 0, header, 0, 4); // set block number
Buffer.BlockCopy(Helper.GetBytes(next, false), 0, header, 4, 4); // set next pointer
_datastore.SeekBlock(blocknum);
_datastore.WriteBlockBytes(header, 0, header.Length);
int c = len;
if (c > dblocksize)
{
c = dblocksize;
}
_datastore.WriteBlockBytes(data, offset, c);
if (next > 0)
{
blocknum = next;
ab.Blocks.Add(next);
}
offset += c;
len -= c;
counter++;
}
return(firstblock);
}