1 files changed, 31 insertions, 0 deletions
diff --git a/ext/win32/lib/Win32API.rb b/ext/win32/lib/Win32API.rb
new file mode 100644
index 0000000000..4d7d4887a5
--- /dev/null
+++ b/ext/win32/lib/Win32API.rb
@@ -0,0 +1,31 @@
+# -*- ruby -*-
+# for backward compatibility
+warn "Warning:#{caller[0].sub(/:in `.*'\z/, '')}: Win32API is deprecated after Ruby 1.9.1; use dl directly instead" if $VERBOSE
+
+require 'dl'
+
+class Win32API
+  DLL = {}
+  TYPEMAP = {"0" => DL::TYPE_VOID, "S" => DL::TYPE_VOIDP, "I" => DL::TYPE_LONG}
+  POINTER_TYPE = DL::SIZEOF_VOIDP == DL::SIZEOF_LONG_LONG ? 'q*' : 'l!*'
+
+  def initialize(dllname, func, import, export = "0", calltype = :stdcall)
+    @proto = [import].join.tr("VPpNnLlIi", "0SSI").sub(/^(.)0*$/, '\1')
+    handle = DLL[dllname] ||= DL.dlopen(dllname)
+    @func = DL::CFunc.new(handle[func], TYPEMAP[export.tr("VPpNnLlIi", "0SSI")], func, calltype)
+  rescue DL::DLError => e
+    raise LoadError, e.message, e.backtrace
+  end
+
+  def call(*args)
+    import = @proto.split("")
+    args.each_with_index do |x, i|
+      args[i], = [x == 0 ? nil : x].pack("p").unpack(POINTER_TYPE) if import[i] == "S"
+      args[i], = [x].pack("I").unpack("i") if import[i] == "I"
+    end
+    ret, = @func.call(args)
+    return ret || 0
+  end
+
+  alias Call call
+end