/// <summary>
/// Reads an object's data from the specified binary reader and creates a new instance of that object with the given data. For user-defined types, a new object of the specified type is returned without any fields initialized. For arrays, a new object with the correct rank lengths is returned. For strings and primitives, an object with the correct value is returned.
/// </summary>
/// <param name="context">The current deserialization context, with data about the current object graph and known types.</param>
/// <param name="reader">The binary reader to utilize.</param>
/// <param name="type">The type of the object to create.</param>
/// <returns>The created object.</returns>
protected virtual object ReadAndCreateObject(PowerDeserializationContext context, BinaryReader reader, Type type)
{
CheckTypeAllowance(type);
object toReturn;
if (type == typeof(string))
{
toReturn = reader.ReadString();
}
else if (type == typeof(Type))
{
toReturn = TypeResolver.ReadTypeID(reader);
}
else if (type.IsPrimitive)
{
toReturn = ReadPrimitiveObject(reader, type);
}
else if (type.IsArray)
{
byte rankSize = reader.ReadByte();
int[] ranks = new int[rankSize];
for (int i = 0; i < rankSize; i++)
{
ranks[i] = reader.ReadInt32();
}
toReturn = Array.CreateInstance(type.GetElementType(), ranks);
}
else
{
toReturn = FormatterServices.GetUninitializedObject(type);
}
context.RegisterNextObject(toReturn);
return(toReturn);
}
/// <summary>
/// Deserializes the given object, populating its fields by reading its object references and primitive data from the given binary reader.
/// </summary>
/// <param name="context">The current deserialization context, with data about the current object graph and known types.</param>
/// <param name="reader">The binary reader to utilize.</param>
/// <param name="obj">The object whose fields should be populated.</param>
/// <param name="type">The type of the deserialized object.</param>
protected virtual void DeserializeObject(PowerDeserializationContext context, BinaryReader reader, object obj, Type type)
{
if (type.IsArray)
{
Array array = (Array)obj;
int[] ranks = new int[array.Rank];
for (int i = 0; i < array.Rank; i++)
{
ranks[i] = array.GetLength(i);
}
Type elementType = type.GetElementType();
CheckTypeAllowance(elementType);
if (elementType.IsPrimitive)
{
ReadFlattenedPrimitiveArray(reader, array, 0, ranks, new int[array.Rank], elementType);
}
else if (elementType.IsValueType)
{
ReadFlattenedValueTypeArray(context, reader, array, 0, ranks, new int[array.Rank], elementType);
}
else
{
ReadFlattenedArray(context, reader, array, 0, ranks, new int[array.Rank]);
}
}
else if (type.IsPrimitive || obj is Type)
{
}
else
{
DeserializeReferenceType(context, reader, obj, type);
}
}
/// <summary>
/// Deserializes an object from a byte array.
/// </summary>
/// <param name="data">The byte-based representation of the object.</param>
/// <returns>The deserialized object.</returns>
public virtual object Deserialize(byte[] data)
{
using (MemoryStream stream = new MemoryStream(data))
{
using (BinaryReader reader = new BinaryReader(stream))
{
PowerDeserializationContext context = CreateDeserializationContext();
int dataLength = data.Length - 4;
stream.Position = dataLength;
int typeSize = reader.ReadInt32();
stream.Position = data.Length - typeSize - 4;
List <Type> knownTypes = new List <Type>();
while (reader.BaseStream.Position < dataLength)
{
knownTypes.Add(TypeResolver.ReadTypeID(reader));
}
stream.Position = 0;
context.IncludedTypes = knownTypes;
object obj = ReadAndCreateObject(context, reader, knownTypes[0]);
if (obj is NullRepresentative)
{
obj = null;
}
for (int i = 1; i < context.ObjectGraph.Count; i++)
{
DeserializeObject(context, reader, context.ObjectGraph[i], context.ObjectGraph[i].GetType());
}
return(ProcessObjectGraph(context));
}
}
}
private void ReadFlattenedArray(PowerDeserializationContext context, BinaryReader reader, Array array, int index, int[] ranks, int[] currentRanks)
{
if (index < ranks.Length)
{
for (int i = 0; i < ranks[index]; i++)
{
ReadFlattenedArray(context, reader, array, index + 1, ranks, currentRanks);
currentRanks[index]++;
}
}
else
{
array.SetValue(ReadObjectReference(context, reader), currentRanks);
}
}
private void ReadFlattenedValueTypeArray(PowerDeserializationContext context, BinaryReader reader, Array array, int index, int[] ranks, int[] currentRanks, Type type)
{
if (index < ranks.Length)
{
for (int i = 0; i < ranks[index]; i++)
{
ReadFlattenedValueTypeArray(context, reader, array, index + 1, ranks, currentRanks, type);
currentRanks[index]++;
}
}
else
{
object obj = FormatterServices.GetUninitializedObject(type);
DeserializeReferenceType(context, reader, obj, type);
array.SetValue(obj, currentRanks);
}
}
/// <summary>
/// Reads an object reference from the given binary reader. If the object has not been referenced before, a new object of the specified type is instantiated.
/// </summary>
/// <param name="context">The current deserialization context, with data about the current object graph and known types.</param>
/// <param name="reader">The binary reader to utilize.</param>
/// <returns>The referenced object.</returns>
protected virtual object ReadObjectReference(PowerDeserializationContext context, BinaryReader reader)
{
ushort id = reader.ReadUInt16();
if (id == 0)
{
return(null);
}
else if (context.HasObject(id))
{
return(context.GetObject(id));
}
else
{
return(ReadAndCreateObject(context, reader, context.GetTypeFromID(reader.ReadUInt16())));
}
}
private void DeserializeReferenceType(PowerDeserializationContext context, BinaryReader reader, object obj, Type type)
{
foreach (FieldInfo info in type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
if (info.FieldType.IsPrimitive)
{
CheckTypeAllowance(info.FieldType);
info.SetValue(obj, ReadPrimitiveObject(reader, info.FieldType));
}
else if (info.FieldType.IsValueType)
{
CheckTypeAllowance(info.FieldType);
object field = FormatterServices.GetUninitializedObject(info.FieldType);
DeserializeReferenceType(context, reader, field, info.FieldType);
info.SetValue(obj, field);
}
else
{
info.SetValue(obj, ReadObjectReference(context, reader));
}
}
}
/// <summary>
/// Processes the generated object graph, makes any last-minute changes if necessary, and returns the deserialized object.
/// </summary>
/// <param name="context">The current deserialization context.</param>
/// <returns>The final deserialized object.</returns>
protected virtual object ProcessObjectGraph(PowerDeserializationContext context)
{
return(context.ObjectGraph[1]);
}
