private (TKey key, TValue value, long nextOffset, int nextSize) ReadDataRecord(long dataOffset, int dataSize)
{
if (valueBuffer.Length < dataSize)
{
valueBuffer = new byte[256 * (1 + (dataSize + 255) / 256)];
}
dataStorage.ReadAll(dataOffset, valueBuffer, 0, dataSize);
var keySize = BitConverter.ToInt32(valueBuffer, 0);
var dataKey = keySerializer.GetValue(valueBuffer.Skip(sizeof(int)).Take(keySize).ToArray());
var valueSize = BitConverter.ToInt32(valueBuffer, sizeof(int) + keySize);
var dataValue = valueSerializer.GetValue(valueBuffer.Skip(sizeof(int) + keySize + sizeof(int)).Take(valueSize).ToArray());
var nextOffset = BitConverter.ToInt64(valueBuffer, dataSize - sizeof(long) - sizeof(int));
var nextSize = BitConverter.ToInt32(valueBuffer, dataSize - sizeof(int));
return(dataKey, dataValue, nextOffset, nextSize);
}
public TValue this[long index]
{
get
{
var offset = linearIndex[index];
if (offset == 0)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
dataStorage.ReadAll(offset, sizeBuffer, 0, sizeBuffer.Length);
int dataSize = BitConverter.ToInt32(sizeBuffer, 0);
//TODO: Improve serializer, no need to reallocate
if (valueBuffer == null || valueBuffer.Length != dataSize)
{
valueBuffer = new byte[dataSize];
}
dataStorage.ReadAll(offset + sizeBuffer.Length, valueBuffer, 0, valueBuffer.Length);
return(valueSerializer.GetValue(valueBuffer));
}
set
{
var offset = linearIndex[index];
if (offset == 0)
{
offset = dataStorage.Length;
linearIndex[index] = dataStorage.Length;
}
var data = valueSerializer.GetBytes(value);
var dataSize = BitConverter.GetBytes(data.Length);
dataStorage.WriteAll(offset, dataSize, 0, dataSize.Length);
dataStorage.WriteAll(offset + dataSize.Length, data, 0, data.Length);
}
}
