如何编写一个映射4 GB的内存管理器用于Delphi

unit MemoryManager;

interface

type
  TMemoryManager = class
  private
    FMemoryBlock: Pointer;
    FAllocated: array of Boolean;
    FBlockSize: Integer;
    FBlockCount: Integer;
  public
    constructor Create;
    destructor Destroy; override;
    function Allocate(Size: Integer): Pointer;
    procedure Free(P: Pointer);
  end;

implementation

uses
  Windows;

constructor TMemoryManager.Create;
begin
  FBlockSize := 4096; // 4 KB
  FBlockCount := 1024 * 1024; // 4 GB / 4 KB
  FMemoryBlock := VirtualAlloc(nil, FBlockSize * FBlockCount, MEM_RESERVE, PAGE_READWRITE);
  SetLength(FAllocated, FBlockCount);
end;

destructor TMemoryManager.Destroy;
begin
  VirtualFree(FMemoryBlock, 0, MEM_RELEASE);
  inherited;
end;

function TMemoryManager.Allocate(Size: Integer): Pointer;
var
  i: Integer;
begin
  // Find a free block of appropriate size
  for i := 0 to FBlockCount - 1 do
  begin
    if not FAllocated[i] and (Size <= FBlockSize) then
    begin
      FAllocated[i] := True;
      Result := Pointer(Integer(FMemoryBlock) + i * FBlockSize);
      Exit;
    end;
  end;
  Result := nil; // No free block found
end;

procedure TMemoryManager.Free(P: Pointer);
var
  Index: Integer;
begin
  Index := (Integer(P) - Integer(FMemoryBlock)) div FBlockSize;
  if (Index >= 0) and (Index < FBlockCount) then
    FAllocated[Index] := False;
end;

end.