object RangeAllocator <LocalAllocation> .IMoveListener.Save(RangeAllocator <LocalAllocation> .Range range)
{
var bytes = _globalHeap.GetBuffer(_globalHandle, false);
var save = new byte[range.Size];
Buffer.BlockCopy(bytes, range.Position, save, 0, range.Size);
return(save);
}
void RangeAllocator <LocalAllocation> .IMoveListener.Load(RangeAllocator <LocalAllocation> .Range range, object data)
{
var bytes = _globalHeap.GetBuffer(_globalHandle, true);
Buffer.BlockCopy((byte[])data, 0, bytes, range.Position, range.Size);
if (range.User.Moveable)
{
bytes.WriteWord(range.User.handleOrPtr, (ushort)range.Position);
}
}
void RangeAllocator <LocalAllocation> .IMoveListener.Move(RangeAllocator <LocalAllocation> .Range range, int newPosition)
{
var bytes = _globalHeap.GetBuffer(_globalHandle, true);
Buffer.BlockCopy(bytes, range.Position, bytes, newPosition, range.Size);
// Update the local handle to point to the new location
if (range.User.Moveable)
{
bytes.WriteWord(range.User.handleOrPtr, (ushort)newPosition);
}
}
public LocalHeap(GlobalHeap globalHeap, ushort globalHandle, ushort baseOffset, ushort maxSize)
{
_globalHeap = globalHeap;
_globalHandle = globalHandle;
// Dont allocate at zero
if (baseOffset == 0)
{
baseOffset = 16;
}
// Work out top of heap
uint topOfHeap = _globalHeap.Size(globalHandle);
uint heapLimit = baseOffset + (uint)(maxSize == 0 ? 0x10000 : maxSize);
if (heapLimit > topOfHeap)
{
heapLimit = topOfHeap;
}
_allocator = new RangeAllocator <LocalAllocation>((int)heapLimit);
_freeHandles = new List <ushort>();
_handleOrPtrMap = new Dictionary <ushort, LocalAllocation>();
var reservedPage = _allocator.Alloc(baseOffset, false, false);
reservedPage.User = new LocalAllocation()
{
flags = Win16.LMEM_FIXED,
handleOrPtr = 0,
range = reservedPage,
};
_allocator.MoveListener = this;
_baseOffset = baseOffset;
}
