1 files changed, 101 insertions, 0 deletions
diff --git a/ext/dl/lib/dl/value.rb b/ext/dl/lib/dl/value.rb
new file mode 100644
index 0000000000..1357106a42
--- /dev/null
+++ b/ext/dl/lib/dl/value.rb
@@ -0,0 +1,101 @@
+require 'dl'
+
+module DL
+  module ValueUtil
+    def unsigned_value(val, ty)
+      case ty.abs
+      when TYPE_CHAR
+        [val].pack("c").unpack("C")[0]
+      when TYPE_SHORT
+        [val].pack("s!").unpack("S!")[0]
+      when TYPE_INT
+        [val].pack("i!").unpack("I!")[0]
+      when TYPE_LONG
+        [val].pack("l!").unpack("L!")[0]
+      when TYPE_LONG_LONG
+        [val].pack("q!").unpack("Q!")[0]
+      else
+        val
+      end
+    end
+
+    def signed_value(val, ty)
+      case ty.abs
+      when TYPE_CHAR
+        [val].pack("C").unpack("c")[0]
+      when TYPE_SHORT
+        [val].pack("S!").unpack("s!")[0]
+      when TYPE_INT
+        [val].pack("I!").unpack("i!")[0]
+      when TYPE_LONG
+        [val].pack("L!").unpack("l!")[0]
+      when TYPE_LONG_LONG
+        [val].pack("Q!").unpack("q!")[0]
+      else
+        val
+      end
+    end
+
+    def wrap_args(args, tys, funcs, &block)
+      result = []
+      tys ||= []
+      args.each_with_index{|arg, idx|
+        result.push(wrap_arg(arg, tys[idx], funcs, &block))
+      }
+      result
+    end
+
+    def wrap_arg(arg, ty, funcs, &block)
+        funcs ||= []
+        case arg
+        when CPtr
+          return arg.to_i
+        when Function
+          if( block )
+            arg.bind_at_call(&block)
+            funcs.push(arg)
+          end
+          return arg.to_i
+        when String
+          if( ty.is_a?(Array) )
+            return arg.unpack('C*')
+          else
+            case SIZEOF_VOIDP
+            when SIZEOF_LONG
+              return [arg].pack("p").unpack("l!")[0]
+            when SIZEOF_LONG_LONG
+              return [arg].pack("p").unpack("q")[0]
+            else
+              raise(RuntimeError, "sizeof(void*)?")
+            end
+          end
+        when Float, Integer
+          return arg
+        when Array
+          if( ty.is_a?(Array) ) # used only by struct
+            case ty[0]
+            when TYPE_VOIDP
+              return arg.collect{|v| Integer(v)}
+            when TYPE_CHAR
+              if( arg.is_a?(String) )
+                return val.unpack('C*')
+              end
+            end
+            return arg
+          else
+            return arg
+          end
+        else
+          if( arg.respond_to?(:to_ptr) )
+            return arg.to_ptr.to_i
+          else
+            begin
+              return Integer(arg)
+            rescue
+              raise(ArgumentError, "unknown argument type: #{arg.class}")
+            end
+          end
+        end
+    end
+  end
+end