/// <summary>
/// 将一个对象字段转换为二进制元数据
/// </summary>
/// <param name="metadata">需要转换成元数据的Value字典</param>
/// <param name="proxy">内存段代理器</param>
internal unsafe static void ToBytes(ResourceBlock metadata, IMemorySegmentProxy proxy)
{
Dictionary <byte, BaseValueStored> valueStoreds = metadata.GetMetaDataDictionary();
uint markRangeLength = (uint)(valueStoreds.Count * 5);
MemoryPosition wrapperStartPosition = proxy.GetPosition();
proxy.Skip(4U);
proxy.WriteUInt16((ushort)(valueStoreds.Count));
MemoryPosition wrapperMarkRangeStartPosition = proxy.GetPosition();
proxy.Skip(markRangeLength);
MemoryPosition wrapperOffsetStartPosition = proxy.GetPosition();
MarkRange * markRange = stackalloc MarkRange[valueStoreds.Count];
int i = 0;
foreach (KeyValuePair <byte, BaseValueStored> valueStored in valueStoreds)
{
//转化成二进制数组的形式
MemoryPosition wrapperCurrentPosition = proxy.GetPosition();
uint currentOffset = (uint)MemoryPosition.CalcLength(proxy.SegmentCount, wrapperOffsetStartPosition, wrapperCurrentPosition);
(markRange + i)->Id = valueStored.Key;
(markRange + i++)->Flag = (uint)((currentOffset << 8) | (int)valueStored.Value.TypeId);
if (valueStored.Value.IsNull)
{
continue;
}
valueStored.Value.ToBytes(proxy);
}
MemoryPosition wrapperEndPosition = proxy.GetPosition();
//回写mark Range
proxy.WriteBackMemory(wrapperMarkRangeStartPosition, markRange, markRangeLength);
//回写4bytes总长
proxy.WriteBackInt32(wrapperStartPosition, MemoryPosition.CalcLength(proxy.SegmentCount, wrapperStartPosition, wrapperEndPosition));
}
/// <summary>
/// Attempts packing a ResourceBlock as a MetadataContainer
/// </summary>
/// <param name="resource">Targeted ResourceBlock object.</param>
/// <returns>return a packed MetadataContainer object.</returns>
public static MetadataContainer AsMetadataContainer(this ResourceBlock resource)
{
return(new MetadataContainer(resource.GetMetaDataDictionary()));
}
