private static Stream ToStream <T>(int version, MessageBase <T> item)
where T : MessageBase <T>
{
Stream stream = null;
try
{
stream = new RangeStream(item.Export(_bufferManager));
var dic = new Dictionary <byte, Stream>();
try
{
stream.Seek(0, SeekOrigin.Begin);
RecyclableMemoryStream deflateBufferStream = null;
try
{
deflateBufferStream = new RecyclableMemoryStream(_bufferManager);
using (var deflateStream = new DeflateStream(deflateBufferStream, CompressionMode.Compress, true))
using (var safeBuffer = _bufferManager.CreateSafeBuffer(1024 * 4))
{
int length;
while ((length = stream.Read(safeBuffer.Value, 0, safeBuffer.Value.Length)) > 0)
{
deflateStream.Write(safeBuffer.Value, 0, length);
}
}
deflateBufferStream.Seek(0, SeekOrigin.Begin);
dic.Add((byte)ConvertCompressionAlgorithm.Deflate, deflateBufferStream);
}
catch (Exception)
{
if (deflateBufferStream != null)
{
deflateBufferStream.Dispose();
}
}
}
catch (Exception)
{
}
dic.Add((byte)ConvertCompressionAlgorithm.None, stream);
var list = dic.ToList();
list.Sort((x, y) =>
{
int c = x.Value.Length.CompareTo(y.Value.Length);
if (c != 0)
{
return(c);
}
return(x.Key.CompareTo(y.Key));
});
for (int i = 1; i < list.Count; i++)
{
list[i].Value.Dispose();
}
var headerStream = new RecyclableMemoryStream(_bufferManager);
Varint.SetUInt64(headerStream, (uint)version);
Varint.SetUInt64(headerStream, list[0].Key);
var dataStream = new UniteStream(headerStream, list[0].Value);
var crcStream = new MemoryStream(Crc32_Castagnoli.Compute(new WrapperStream(dataStream)));
return(new UniteStream(dataStream, crcStream));
}
catch (Exception ex)
{
if (stream != null)
{
stream.Dispose();
}
throw new ArgumentException(ex.Message, ex);
}
}
