Add bin and edit workflow

bin/gems/ffi-1.17.4-x86_64-linux-gnu/lib/ffi/autopointer.rb

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+#
+# Copyright (C) 2008-2010 Wayne Meissner
+# Copyright (C) 2008 Mike Dalessio
+#
+# This file is part of ruby-ffi.
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright notice
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+# * Neither the name of the Ruby FFI project nor the names of its contributors
+#   may be used to endorse or promote products derived from this software
+#   without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+module FFI
+  class AutoPointer < Pointer
+    extend DataConverter
+
+    # @overload initialize(pointer, method)
+    #   @param pointer [Pointer]
+    #   @param method [Method]
+    #   @return [self]
+    #   The passed Method will be invoked at GC time.
+    # @overload initialize(pointer, proc)
+    #   @param pointer [Pointer]
+    #   @return [self]
+    #   The passed Proc will be invoked at GC time (SEE WARNING BELOW!)
+    #   @note WARNING: passing a proc _may_ cause your pointer to never be
+    #     GC'd, unless you're careful to avoid trapping a reference to the
+    #     pointer in the proc. See the test specs for examples.
+    # @overload initialize(pointer)
+    #   @param pointer [Pointer]
+    #   @return [self]
+    #   The pointer's release() class method will be invoked at GC time.
+    #
+    # @note The safest, and therefore preferred, calling
+    #  idiom is to pass a Method as the second parameter. Example usage:
+    #
+    #   class PointerHelper
+    #     def self.release(pointer)
+    #       ...
+    #     end
+    #   end
+    #
+    #   p = AutoPointer.new(other_pointer, PointerHelper.method(:release))
+    #
+    #  The above code will cause PointerHelper#release to be invoked at GC time.
+    #
+    # @note
+    #  The last calling idiom (only one parameter) is generally only
+    #  going to be useful if you subclass {AutoPointer}, and override
+    #  #release, which by default does nothing.
+    def initialize(ptr, proc=nil)
+      raise TypeError, "Invalid pointer" if ptr.nil? || !ptr.kind_of?(Pointer) ||
+          ptr.kind_of?(MemoryPointer) || ptr.kind_of?(AutoPointer)
+      super(ptr.type_size, ptr)
+
+      @releaser = if proc
+                    if not proc.respond_to?(:call)
+                      raise RuntimeError.new("proc must be callable")
+                    end
+                    Releaser.new(ptr, proc)
+
+                  else
+                    if not self.class.respond_to?(:release, true)
+                      raise RuntimeError.new("no release method defined")
+                    end
+                    Releaser.new(ptr, self.class.method(:release))
+                  end
+
+      ObjectSpace.define_finalizer(self, @releaser)
+      self
+    end
+
+    def dup
+      raise RuntimeError, "cannot duplicate FFI::AutoPointer"
+    end
+
+    alias clone dup
+
+    # @return [nil]
+    # Free the pointer.
+    def free
+      @releaser.free
+    end
+
+    # @param [Boolean] autorelease
+    # @return [Boolean] +autorelease+
+    # Set +autorelease+ property. See {Pointer Autorelease section at Pointer}.
+    def autorelease=(autorelease)
+      raise FrozenError.new("can't modify frozen #{self.class}") if frozen?
+      @releaser.autorelease=(autorelease)
+    end
+
+    # @return [Boolean] +autorelease+
+    # Get +autorelease+ property. See {Pointer Autorelease section at Pointer}.
+    def autorelease?
+      @releaser.autorelease
+    end
+
+    # @abstract Base class for {AutoPointer}'s releasers.
+    #
+    #  All subclasses of Releaser should define a +#release(ptr)+ method.
+    # A releaser is an object in charge of release an {AutoPointer}.
+    class Releaser
+      attr_accessor :autorelease
+
+      # @param [Pointer] ptr
+      # @param [#call] proc
+      # @return [nil]
+      # A new instance of Releaser.
+      def initialize(ptr, proc)
+        @ptr = ptr
+        @proc = proc
+        @autorelease = true
+      end
+
+      # @return [nil]
+      # Free pointer.
+      def free
+        if @ptr
+          release(@ptr)
+          @autorelease = false
+          @ptr = nil
+          @proc = nil
+        end
+      end
+
+      # @param args
+      # Release pointer if +autorelease+ is set.
+      def call(*args)
+        release(@ptr) if @autorelease && @ptr
+      end
+
+      # Release +ptr+ by using Proc or Method defined at +ptr+
+      # {AutoPointer#initialize initialization}.
+      #
+      # @param [Pointer] ptr
+      # @return [nil]
+      def release(ptr)
+        @proc.call(ptr)
+      end
+    end
+
+    # Return native type of AutoPointer.
+    #
+    # Override {DataConverter#native_type}.
+    # @return [Type::POINTER]
+    # @raise {RuntimeError} if class does not implement a +#release+ method
+    def self.native_type
+      if not self.respond_to?(:release, true)
+        raise RuntimeError.new("no release method defined for #{self.inspect}")
+      end
+      Type::POINTER
+    end
+
+    # Create a new AutoPointer.
+    #
+    # Override {DataConverter#from_native}.
+    # @overload self.from_native(ptr, ctx)
+    #   @param [Pointer] ptr
+    #   @param ctx not used. Please set +nil+.
+    # @return [AutoPointer]
+    def self.from_native(val, ctx)
+      self.new(val)
+    end
+  end
+
+end