public ImmutableEnvelope ReadAsEnvelopeData(byte[] buffer)
{
var header = EnvelopeHeaderContract.ReadHeader(buffer);
if (header.MessageFormatVersion != EnvelopeHeaderContract.Schema2DataFormat)
{
throw new InvalidOperationException("Unexpected bytes in enveloper header");
}
EnvelopeContract envelope;
using (var stream = new MemoryStream(buffer, EnvelopeHeaderContract.FixedSize, (int)header.EnvelopeBytes))
{
envelope = _envelopeSerializer.DeserializeEnvelope(stream);
}
var items = new ImmutableMessage[envelope.Messages.Length];
for (var i = 0; i < items.Length; i++)
{
var itemContract = envelope.Messages[i];
var attributes = EnvelopeConvert.ItemAttributesFromContract(itemContract.Attributes);
Type contractType;
var itemPosition = EnvelopeHeaderContract.FixedSize + (int)header.EnvelopeBytes +
(int)itemContract.ContentPosition;
var itemSize = (int)itemContract.ContentSize;
if (_dataSerializer.TryGetContractTypeByName(itemContract.ContractName, out contractType))
{
try
{
// we can deserialize. Convert it to a message
using (var stream = new MemoryStream(buffer, itemPosition, itemSize))
{
var instance = _dataSerializer.Deserialize(stream, contractType);
items[i] = new ImmutableMessage(contractType, instance, attributes, i);
}
}
catch (Exception ex)
{
throw new InvalidOperationException("Failed to deserialize: " + itemContract.ContractName, ex);
}
}
else
{
// we can't deserialize. Keep it as buffer
var bufferInstance = new byte[itemContract.ContentSize];
Buffer.BlockCopy(buffer, itemPosition, bufferInstance, 0, itemSize);
items[i] = new ImmutableMessage(null, bufferInstance, attributes, i);
}
}
var envelopeAttributes = EnvelopeConvert.EnvelopeAttributesFromContract(envelope.EnvelopeAttributes);
return(new ImmutableEnvelope(envelope.EnvelopeId, envelopeAttributes, items, envelope.DeliverOnUtc,
envelope.CreatedOnUtc));
}