private (long offset, int size) Append(TKey key, TValue value)
{
var keyBytes = keySerializer.GetBytes(key);
var valueBytes = valueSerializer.GetBytes(value);
var offsetStart = dataStorage.Length;
var offset = offsetStart;
dataStorage.WriteAll(offset, BitConverter.GetBytes(keyBytes.Length), 0, sizeof(int));
offset += sizeof(int);
dataStorage.WriteAll(offset, keyBytes, 0, keyBytes.Length);
offset += keyBytes.Length;
dataStorage.WriteAll(offset, BitConverter.GetBytes(valueBytes.Length), 0, sizeof(int));
offset += sizeof(int);
dataStorage.WriteAll(offset, valueBytes, 0, valueBytes.Length);
offset += valueBytes.Length;
// Link
dataStorage.WriteAll(offset, BitConverter.GetBytes(0L), 0, sizeof(long));
offset += sizeof(long);
dataStorage.WriteAll(offset, BitConverter.GetBytes(0), 0, sizeof(int));
offset += sizeof(int);
checked
{
return(offsetStart, (int)(offset - offsetStart));
}
}
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);
}
}
