/// <summary>
/// Read a layout model
/// </summary>
/// <typeparam name="T">The Layout Model value Type</typeparam>
/// <param name="position">The position in the file at which to begin reading
/// relative to the current position in the file. Default is 0</param>
/// <param name="model">The structure to contain the read data</param>
public void ReadLayout <TLayoutType>(LayoutModel <TLayoutType> model, long position)
where TLayoutType : struct
{
if (this.Accessor != null)
{
TLayoutType fileData;
this.Accessor.Read <TLayoutType>(position, out fileData);
model.SetData(fileData);
}
}
/// <summary>
/// Peek ahead bytes but do not chnage the seek pointer in sequential access
/// </summary>
/// <param name="position">The position in the file at which to begin reading
/// relative to the current position in the file. Default is 0</param>
/// <param name="count">The number of bytes to read. Default 1.</param>
/// <returns>A byte array</returns>
public LayoutModel <TLayoutType> PeekStructure <TLayoutType>(int count = 1, long position = 0)
where TLayoutType : struct
{
LayoutModel <TLayoutType> model = new LayoutModel <TLayoutType>();
using (MemoryMappedViewAccessor tempPeek = this.MemoryFile.CreateViewAccessor(position,
count, MemoryMappedFileAccess.Read))
{
TLayoutType fileData;
tempPeek.Read(position, out fileData);
model.SetData(fileData);
}
return(model);
}
private static void ReadLayoutHelper <TLayoutType>(MemoryMappedViewStream viewStream
, LayoutModel <TLayoutType> model
, long position = 0)
where TLayoutType : struct
{
if (viewStream != null)
{
// Seek Position from current
viewStream.Seek(position, System.IO.SeekOrigin.Current);
byte[] bytes = ReadBytes(viewStream, (int)LayoutModel <TLayoutType> .DataSize, position);
GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
model.SetData(Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(TLayoutType)));
handle.Free();
}
}
