public static PropertyList Read(
Stream input,
DataFormats.PropertyList resource,
Endian endian,
PropertySetSchemaProvider schemaProvider)
{
var instance = new PropertyList();
instance._Flags = resource.Flags;
instance._TypeId = (byte)resource.TypeId;
instance._TotalWeight = resource.TotalWeight;
instance.Items.Clear();
instance.Weights.Clear();
if (resource.ItemCount > 0)
{
var handler = HandlerFactory.Get(resource.TypeId);
if (handler.ByteSize != resource.ItemSize)
{
throw new InvalidOperationException();
}
if (resource.DataOffset == 0)
{
throw new InvalidOperationException();
}
input.Position = resource.DataOffset;
using (var data = input.ReadToMemoryStream(resource.ItemCount * resource.ItemSize))
{
for (uint i = 0, o = 0; i < resource.ItemCount; i++, o += resource.ItemSize)
{
data.Position = o;
object item;
if (handler.UsesPointer == false)
{
item = handler.Read(data, endian, schemaProvider);
}
else
{
var pointerOffset = data.ReadOffset(endian);
if (pointerOffset == 0)
{
throw new InvalidOperationException();
}
input.Position = resource.DataOffset + pointerOffset;
item = handler.Read(input, endian, schemaProvider);
}
instance.Items.Add(item);
}
}
if (resource.WeightsOffset != 0)
{
input.Position = resource.WeightsOffset;
for (uint i = 0; i < resource.ItemCount; i++)
{
var weight = input.ReadValueU32(endian);
instance.Weights.Add(weight);
}
}
}
return(instance);
}
public static void Write(
Stream output,
PropertyList instance,
Endian endian,
DataFormats.PropertyList resource,
long ownerOffset,
PropertySetSchemaProvider schemaProvider)
{
if (instance.TypeId == 29)
{
resource.Flags = instance._Flags;
resource.DataOffset = 0;
resource.TypeId = instance._TypeId;
resource.ItemSize = 0;
resource.WeightsOffset = 0;
resource.ItemCount = 0;
resource.TotalWeight = 0;
return;
}
if (instance.Weights.Count > 0 &&
instance.Weights.Count != instance.Items.Count)
{
throw new InvalidOperationException();
}
var handler = HandlerFactory.Get(instance._TypeId);
resource.Flags = instance._Flags;
resource.TypeId = instance._TypeId;
resource.ItemSize = (uint)handler.ByteSize;
resource.ItemCount = (uint)instance.Items.Count;
resource.TotalWeight = instance._TotalWeight;
var dataSize = resource.ItemSize * resource.ItemCount;
resource.DataOffset = output.Position;
resource.WeightsOffset = resource.DataOffset + dataSize;
long dataOffset;
if (instance.Weights.Count > 0)
{
resource.WeightsOffset = resource.DataOffset + dataSize;
dataOffset = resource.WeightsOffset + (4 * resource.ItemCount);
}
else
{
dataOffset = resource.WeightsOffset;
resource.WeightsOffset = 0;
}
if (resource.ItemCount > 0)
{
output.Position = dataOffset;
using (var data = new MemoryStream())
{
foreach (var item in instance.Items)
{
if (handler.UsesPointer == false)
{
handler.Write(data, item, endian, ownerOffset, schemaProvider);
data.Position = data.Position.Align(handler.Alignment);
data.SetLength(data.Position);
}
else
{
var pointerOffset = output.Position - resource.DataOffset;
handler.Write(output, item, endian, ownerOffset, schemaProvider);
output.Position = output.Position.Align(handler.Alignment);
data.WriteOffset(pointerOffset, endian);
data.Position = data.Position.Align(8);
data.SetLength(data.Position);
}
}
data.Flush();
if (data.Length != dataSize)
{
throw new InvalidOperationException();
}
var endPosition = output.Position;
output.Position = resource.DataOffset;
data.Position = 0;
output.WriteFromStream(data, data.Length);
if (instance.Weights.Count > 0)
{
output.Position = resource.WeightsOffset;
foreach (var weight in instance.Weights)
{
output.WriteValueU32(weight, endian);
}
}
output.Position = endPosition;
}
}
}