private void EnsureOpenStreamHeader()
{
if (_streamHeaderPosition == -1L)
{
Writer.Write(SerializerHeaders.Barf);
_streamHeaderPosition = BarfStreamHeader.BeginWrite(Writer, BarfFormatter.CurrentFrameworkVersion);
}
}
internal static BarfStreamHeader ReadFrom(IPrimitiveReader reader)
{
var result = new BarfStreamHeader();
var value = reader.ReadVarInt32();
if (value < 0)
{
reader.RaiseInvalidDataException();
}
result.FrameworkVersion = value;
result.Flags = (HeaderFlags)reader.ReadByte();
return(result);
}
private void EnsureCloseStreamHeader()
{
if (_recursionCount == 0)
{
var flags = HeaderFlags.None;
if (_typeTable != null && _typeTable.Count > 0)
{
flags |= HeaderFlags.HasNameTable;
}
BarfStreamHeader.EndWrite(Writer, _streamHeaderPosition, flags);
if ((flags & HeaderFlags.HasNameTable) == HeaderFlags.HasNameTable)
{
_typeTable.WriteTo(Writer);
}
_streamHeaderPosition = -1L;
_typeTable = null;
}
}
/// <summary>
/// Begins a region of code that deserializes a barf type.
/// </summary>
public BarfObjectHeader BeginObject <T>()
{
var def = BarfTypeDefinition.Get <T>(true);
bool deserializeTypeTable = false;
if (StreamHeader == null)
{
StreamHeader = BarfStreamHeader.ReadFrom(Reader);
if (StreamHeader.FrameworkVersion > BarfFormatter.MaxFrameworkVersion)
{
string message = string.Format(
"Encountered a BARF formatted stream with FrameworkVersion=\"{0}\" but MaxFrameworkVersion=\"{1}\".",
StreamHeader.FrameworkVersion,
BarfFormatter.MaxFrameworkVersion);
throw new UnhandledVersionException(message);
}
deserializeTypeTable = StreamHeader.Flags.IsSet(HeaderFlags.HasNameTable);
}
var objectHeader = BarfObjectHeader.ReadFrom(Reader);
if (!objectHeader.IsNull)
{
if (objectHeader.Version < def.MinVersion)
{
var message = string.Format(
"Binary data was encoded with Version=\"{0}\" but the current MinVersion=\"{1}\".",
objectHeader.Version,
def.MinVersion);
throw new UnhandledVersionException(message);
}
if (def.CurrentVersion < objectHeader.MinVersion)
{
var message = string.Format(
"Binary data was encoded with a MinVersion=\"{0}\" but CurrentVersion=\"{1}\" is less than that.",
objectHeader.MinVersion,
def.CurrentVersion);
throw new UnhandledVersionException(message);
}
if (objectHeader.Version < def.MinDeserializeVersion)
{
var message = string.Format(
"Binary data is Version=\"{0}\" but MinDeserializeVersion=\"{1}\".",
objectHeader.Version,
def.MinDeserializeVersion);
throw new UnhandledVersionException(message);
}
}
if (deserializeTypeTable)
{
var currentPosition = Reader.BaseStream.Position;
Reader.BaseStream.Seek(objectHeader.Length, SeekOrigin.Current);
TypeTable = BarfTypeTable.ReadFrom(Reader);
_streamEnd = Reader.BaseStream.Position;
Reader.BaseStream.Seek(currentPosition, SeekOrigin.Begin);
}
++_objectDepth;
return(objectHeader);
}
