public byte[] GetValue(DataAddr addr)
{
var buf = new byte[addr.len];
lock (LOCK)
{
_fileStream.Position = (long)addr.addr;
_fileStream.Read(buf, 0, (int)addr.len);
}
return(buf);
}
public bool HasKey(HashBin key, out DataAddr dataAddr, bool getDataAddr = false, KeyHint hint = default(KeyHint), byte skipBytes = 0)
{
if (key.Length != _keyLength)
{
throw new ArgumentException($"Key must be {_keyLength} bytes");
}
// bool hasHint = hint.StartAddr >= _keyStart &&
// hint.EndAddr >= hint.StartAddr
// && hint.EndAddr <= _keyEnd;
int compareLength = _keyLength - skipBytes;
if (!(hint.StartAddr >= _keyStart &&
hint.EndAddr >= hint.StartAddr &&
hint.EndAddr <= _keyEnd))
{
hint.StartAddr = _keyStart;
hint.EndAddr = _keyEnd;
compareLength = _keyLength;
}
FileStream.Position = (long)hint.StartAddr;
var remaining = (long)(hint.EndAddr - hint.StartAddr + _keyLength);
long lastRead;
int amountToRead;
var bufReadPos = 0;
int compareRes;
fixed(byte *ptrKey = &key.Hash[0])
{
while (remaining > 0)
{
amountToRead = (int)(remaining < _readBuffer.Length ? remaining : _readBuffer.Length);
lastRead = FileStream.Read(_readBuffer, 0, amountToRead);
remaining -= lastRead;
bufReadPos = 0;
//loop until buffer read
while (bufReadPos < lastRead)
{
//_readBinBuffer.SetPointer(_readBufferPtr+bufReadPos, _keyLength);
//compareRes = _readBinBuffer.CompareTo(key);
compareRes = HashBin.ArrayPtrCompare(_readBufferPtr + bufReadPos, ptrKey, compareLength);
if (compareRes == 0)
{
if (getDataAddr)
{
var foundLocation = FileStream.Position - lastRead + bufReadPos;
//FileStream.Position = ((((foundLocation) / _keyLength) << 4) + (long)_keyEnd + (long)HeaderLength);
AddrsFileStream.Position = (foundLocation / _keyLength) << 4;
dataAddr = new DataAddr
{
addr = _addrReader.ReadUInt64(),
len = _addrReader.ReadUInt64()
};
return(true);
}
dataAddr = default;
return(true);
}
if (compareRes == 1)
{
dataAddr = default;
return(false);
}
//
// if (HashBin.ArrayPtrEqualCompare(ptrKey, _readBufferPtr+bufReadPos, compareLength))
// {
// if (getDataAddr)
// {
// var foundLocation = FileStream.Position - lastRead + bufReadPos;
// FileStream.Position = ((((foundLocation) / _keyLength) << 4) + (long)_keyEnd + (long)HeaderLength);
// dataAddr = new DataAddr();
// dataAddr.addr = _reader.ReadUInt64();
// dataAddr.len = _reader.ReadUInt64();
// return true;
// }
//
// dataAddr = default;
// return true;
// }
bufReadPos += _keyLength;
}
}
}
dataAddr = default;
return(false);
}
public bool GetKeyDataAddr(HashBin key, out DataAddr dataAddr, KeyHint hint = default(KeyHint), byte skipBytes = 0)
{
return(HasKey(key, out dataAddr, true, hint, skipBytes));
}