/// Create and populate a segment with random data
public static DataSegment CreateRandom(Random random, int maxLength)
{
int size = random.Next(0, maxLength);
var chunk = new DataSegment(size);
foreach (ref byte b in chunk.AsSpan())
{
b = s_bytePool[random.Next(255)];
}
return(chunk);
}
public DataSegment Deserialize(ReadOnlySequence <byte> buffer)
{
// length
SequencePosition?pos = buffer.PositionOf((byte)',');
if (pos == null)
{
throw new DataMismatchException("should contain comma-separated values");
}
ReadOnlySequence <byte> lengthBytes = buffer.Slice(0, pos.Value);
int numSize = s_encoding.GetChars(lengthBytes.ToArray(), _charBuffer);
int length = int.Parse(_charBuffer.AsSpan().Slice(0, numSize));
buffer = buffer.Slice(buffer.GetPosition(1, pos.Value));
// checksum
pos = buffer.PositionOf((byte)',');
if (pos == null)
{
throw new DataMismatchException("should contain comma-separated values");
}
ReadOnlySequence <byte> checksumBytes = buffer.Slice(0, pos.Value);
numSize = s_encoding.GetChars(checksumBytes.ToArray(), _charBuffer);
ulong checksum = ulong.Parse(_charBuffer.AsSpan().Slice(0, numSize));
buffer = buffer.Slice(buffer.GetPosition(1, pos.Value));
// payload
if (length != (int)buffer.Length)
{
throw new DataMismatchException("declared length does not match payload length");
}
var chunk = new DataSegment((int)buffer.Length);
buffer.CopyTo(chunk.AsSpan());
if (checksum != chunk.Checksum)
{
chunk.Return();
throw new DataMismatchException("declared checksum doesn't match payload checksum");
}
return(chunk);
}
