private static object WriteObject(MappingWriteArgs args, object item, int baseOffset = 0)
{
var properties = item.GetType()
.GetProperties()
.Select(x => GetPropertySettings(item.GetType(), x))
.Where(x => x.DataInfo != null)
.ToList();
foreach (var property in properties)
{
if (property.DataInfo.Offset.HasValue)
{
var newPosition = baseOffset + property.DataInfo.Offset.Value;
if (args.Writer.BaseStream.Position != newPosition)
{
FlushBitField(args);
}
args.Writer.BaseStream.Position = newPosition;
}
var value = property.MemberInfo.GetValue(item, BindingFlags.Default, null, null, null);
args.Count = property.GetLengthFunc?.Invoke(item) ?? property.DataInfo.Count;
WriteProperty(args, value, property.MemberInfo.PropertyType, property);
}
FlushBitField(args);
return(item);
}
private static void FlushBitField(MappingWriteArgs args)
{
if (args.BitIndex <= 0)
{
return;
}
args.Writer.Write(args.BitData);
args.BitIndex = 0;
args.BitData = 0;
}
private static void WriteObject(MappingWriteArgs args, object value, Type listType, MyProperty property)
{
var writer = args.Writer;
var oldPosition = (int)writer.BaseStream.Position;
WriteProperty(args, value, listType, property);
var newPosition = writer.BaseStream.Position;
var stride = property.DataInfo.Stride;
if (stride > 0)
{
var missingBytes = stride - (int)(newPosition - oldPosition);
if (missingBytes < 0)
{
throw new InvalidOperationException($"The stride is smaller than {listType.Name} definition.");
}
else if (missingBytes > 0)
{
writer.BaseStream.Position += missingBytes;
}
}
}
private static void WriteProperty(MappingWriteArgs args, object value, Type type, MyProperty property)
{
if (type != typeof(bool))
{
FlushBitField(args);
}
if (mappings.TryGetValue(type, out var mapping))
{
args.Item = value;
args.DataAttribute = property.DataInfo;
mapping.Writer(args);
}
else if (type.IsEnum)
{
var underlyingType = Enum.GetUnderlyingType(type);
if (!mappings.TryGetValue(underlyingType, out mapping))
{
throw new InvalidDataException($"The enum {type.Name} has an unsupported size.");
}
args.DataAttribute = property.DataInfo;
args.Item = value;
mapping.Writer(args);
}
else if (type.CanEnumerate())
{
Type itemType;
if (type.IsArray)
{
itemType = type?
.GetMethod("Get")?
.ReturnType;
}
else
{
itemType = type.GetGenericArguments().FirstOrDefault();
}
if (itemType == null)
{
throw new InvalidDataException($"The list {property.MemberInfo.Name} does not have any specified type.");
}
var missing = args.Count;
foreach (var item in value as IEnumerable)
{
if (missing-- < 1)
{
break;
}
WriteObject(args, item, itemType, property);
}
while (missing-- > 0)
{
var item = Activator.CreateInstance(itemType);
WriteObject(args, item, itemType, property);
}
}
else
{
WriteObject(args.Writer, value, (int)args.Writer.BaseStream.Position);
}
}