private T DeserialiseNewObject <T>(MfcClass mfcClass) where T : MfcObject
{
MfcObject newObject = mfcClass.CreateNewObject <MfcObject>();
_loadedObjects.Add(newObject);
newObject.Deserialise(this);
return((T)newObject);
}
public void SerialiseObject(MfcObject mfcObject)
{
if (mfcObject == null)
{
_stream.Write((ushort)NullTag);
return;
}
int prevObjectIndex = _loadedObjects.IndexOf(mfcObject);
if (prevObjectIndex >= 0)
{
// We have already serialised this object and do not need to do so again
if (prevObjectIndex >= BigObjectTag)
{
throw new NotImplementedException("Object count >= 0x7fff not yet supported");
}
_stream.Write((ushort)prevObjectIndex);
return;
}
// A new object, possibly with a new class
_loadedObjects.Add(mfcObject);
MfcClass mfcClass = _classRegistry.GetMfcClass(mfcObject.GetType());
int prevClassIndex = _loadedClasses.IndexOf(mfcClass);
if (prevClassIndex <= 0)
{
// A new class
_loadedClasses.Add(mfcClass);
_stream.Write((ushort)NewClassTag);
_stream.Write((ushort)mfcClass.SchemaVersion);
_stream.Write((ushort)mfcClass.Name.Length);
_stream.WriteAsciiString(mfcClass.Name);
}
else
{
// A previously written class
_stream.Write((ushort)(prevClassIndex | ClassTag));
}
mfcObject.Serialise(this);
}
private MfcClass ReadNewClass()
{
ushort schemaVersion = _stream.ReadUInt16();
ushort classNameLength = _stream.ReadUInt16();
string className = _stream.ReadAsciiString(classNameLength);
MfcClass mfcClass = _classRegistry.GetMfcClass(className);
if (mfcClass == null)
{
throw new InvalidDataException("No registered class for MfcObject " + className);
}
if (mfcClass.SchemaVersion != schemaVersion)
{
throw new InvalidDataException("Schema mismatch: file = " + schemaVersion + ", registered = " + mfcClass.SchemaVersion);
}
return(mfcClass);
}
public T DeserialiseObject <T>() where T : MfcObject
{
uint objectTag;
MfcClass mfcClass = ReadClass(out objectTag);
if (mfcClass == null)
{
// An object we've already loaded
if (objectTag > _loadedObjects.Count)
{
throw new InvalidDataException("Got an object tag larger than the count of loaded objects: " + objectTag);
}
return((T)_loadedObjects[(int)objectTag]);
}
// An object we haven't yet loaded. Create a new instance and deserialise it.
// Make sure to add it to the list of loaded objects before deserialising in
// case it has (possibly indirect) references to itself.
return(DeserialiseNewObject <T>(mfcClass));
}
public string PeekNextObjectType()
{
string nextObjectType;
var savedPosition = _stream.BaseStream.Position;
uint objectTag;
MfcClass mfcClass = ReadClass(out objectTag);
if (mfcClass == null)
{
if (objectTag > _loadedObjects.Count)
{
throw new InvalidDataException("Got an object tag larger than the count of loaded objects: " + objectTag);
}
nextObjectType = _loadedObjects[(int)objectTag].GetType().Name;
}
else
{
nextObjectType = mfcClass.Name;
}
_stream.BaseStream.Position = savedPosition;
return(nextObjectType);
}
internal ushort GetSerialisedClassIndexHack <T>(T item) where T : MfcObject
{
MfcClass mfcClass = _classRegistry.GetMfcClass(item.GetType());
return((ushort)(_loadedClasses.IndexOf(mfcClass) | ClassTag));
}
/// <summary>
/// Deserialises an object of type T without reading in the header.
/// This implies it must be a new object and not one that has already
/// been loaded since there is no object tag to reference the loaded list.
/// </summary>
public T DeserialiseObjectNoHeader <T>() where T : MfcObject
{
MfcClass mfcClass = _classRegistry.GetMfcClass(typeof(T));
return(DeserialiseNewObject <T>(mfcClass));
}
