/// <summary>
/// Helper to convert from legacy persisted data format to the current. The key array is a set of kvp's where the value
/// is an offset in the value buffer. These all need to be recalculated with new value buffer VLE format
/// </summary>
private void TranscodeBuffers(RecyclableMemoryStreamManager memoryStreamManager, Stream destinationStream)
{
using (var intermediateValueStream = memoryStreamManager.GetStream("transcoding value-buffer"))
{
uint currentOffset = 0;
var buffer = new byte[sizeof(uint)];
foreach (var kvp in this.keys)
{
// write the current key and then the offset in fixed length
kvp.Key.Serialize(destinationStream);
ByteConverter.FixedLengthEncoding.Encode(currentOffset, buffer, destinationStream);
var dict = new Dictionary <long, uint>();
var newEntries = this.values.ReadValuesInto(dict, kvp.Value);
currentOffset += BufferedValueArray.WriteVariableLengthEncodedDictionary(
dict,
newEntries,
intermediateValueStream);
}
// now dump the values at the end of the key array
destinationStream.Write(intermediateValueStream.GetBuffer(), 0, (int)intermediateValueStream.Length);
}
}
public uint WriteToPersistedData(MemoryStream writeStream)
{
return(BufferedValueArray.WriteVariableLengthEncodedDictionary(this.samples, (uint)this.SampleCount,
writeStream));
}