#
# This file is part of ruby-ffi.
#
# This code is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License version 3 only, as
# published by the Free Software Foundation.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
# version 3 for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# version 3 along with this work.  If not, see <http://www.gnu.org/licenses/>.
#

require File.expand_path(File.join(File.dirname(__FILE__), "spec_helper"))

describe "Callback" do
#  module LibC
#    extend FFI::Library
#    callback :qsort_cmp, [ :pointer, :pointer ], :int
#    attach_function :qsort, [ :pointer, :int, :int, :qsort_cmp ], :int
#  end
#  it "arguments get passed correctly" do
#    p = MemoryPointer.new(:int, 2)
#    p.put_array_of_int32(0, [ 1 , 2 ])
#    args = []
#    cmp = proc do |p1, p2| args.push(p1.get_int(0)); args.push(p2.get_int(0)); 0; end
#    # this is a bit dodgey, as it relies on qsort passing the args in order
#    LibC.qsort(p, 2, 4, cmp)
#    args.should eq [ 1, 2 ]
#  end
#
#  it "Block can be substituted for Callback as last argument" do
#    p = MemoryPointer.new(:int, 2)
#    p.put_array_of_int32(0, [ 1 , 2 ])
#    args = []
#    # this is a bit dodgey, as it relies on qsort passing the args in order
#    LibC.qsort(p, 2, 4) do |p1, p2|
#      args.push(p1.get_int(0))
#      args.push(p2.get_int(0))
#      0
#    end
#    args.should eq [ 1, 2 ]
#  end
  module LibTest
    extend FFI::Library
    ffi_lib TestLibrary::PATH
    class S8F32S32 < FFI::Struct
      layout :s8, :char, :f32, :float, :s32, :int
    end

    callback :cbVrS8, [ ], :char
    callback :cbVrU8, [ ], :uchar
    callback :cbVrS16, [ ], :short
    callback :cbVrU16, [ ], :ushort
    callback :cbVrS32, [ ], :int
    callback :cbVrU32, [ ], :uint
    callback :cbVrL, [ ], :long
    callback :cbVrUL, [ ], :ulong
    callback :cbVrS64, [ ], :long_long
    callback :cbVrU64, [ ], :ulong_long
    callback :cbVrP, [], :pointer
    callback :cbVrZ, [], :bool
    callback :cbCrV, [ :char ], :void
    callback :cbSrV, [ :short ], :void
    callback :cbIrV, [ :int ], :void
    callback :cbLrV, [ :long ], :void
    callback :cbULrV, [ :ulong ], :void
    callback :cbLrV, [ :long_long ], :void
    callback :cbVrT, [ ], S8F32S32.by_value
    callback :cbTrV, [ S8F32S32.by_value ], :void
    callback :cbYrV, [ S8F32S32.ptr ], :void
    callback :cbVrY, [ ], S8F32S32.ptr

    attach_function :testCallbackVrS8, :testClosureVrB, [ :cbVrS8 ], :char
    attach_function :testCallbackVrU8, :testClosureVrB, [ :cbVrU8 ], :uchar
    attach_function :testCallbackVrS16, :testClosureVrS, [ :cbVrS16 ], :short
    attach_function :testCallbackVrU16, :testClosureVrS, [ :cbVrU16 ], :ushort
    attach_function :testCallbackVrS32, :testClosureVrI, [ :cbVrS32 ], :int
    attach_function :testCallbackVrU32, :testClosureVrI, [ :cbVrU32 ], :uint
    attach_function :testCallbackVrL, :testClosureVrL, [ :cbVrL ], :long
    attach_function :testCallbackVrZ, :testClosureVrZ, [ :cbVrZ ], :bool
    attach_function :testCallbackVrUL, :testClosureVrL, [ :cbVrUL ], :ulong
    attach_function :testCallbackVrS64, :testClosureVrLL, [ :cbVrS64 ], :long_long
    attach_function :testCallbackVrU64, :testClosureVrLL, [ :cbVrU64 ], :ulong_long
    attach_function :testCallbackVrP, :testClosureVrP, [ :cbVrP ], :pointer
    attach_function :testCallbackVrY, :testClosureVrP, [ :cbVrY ], S8F32S32.ptr
    attach_function :testCallbackVrT, :testClosureVrT, [ :cbVrT ], S8F32S32.by_value
    attach_function :testCallbackTrV, :testClosureTrV, [ :cbTrV, S8F32S32.ptr ], :void
    attach_variable :cbVrS8, :gvar_pointer, :cbVrS8
    attach_variable :pVrS8, :gvar_pointer, :pointer
    attach_function :testGVarCallbackVrS8, :testClosureVrB, [ :pointer ], :char
    attach_function :testOptionalCallbackCrV, :testOptionalClosureBrV, [ :cbCrV, :char ], :void

  end
  it "returning :char (0)" do
    LibTest.testCallbackVrS8 { 0 }.should eq 0
  end
  it "returning :char (127)" do
    LibTest.testCallbackVrS8 { 127 }.should eq 127
  end
  it "returning :char (-128)" do
    LibTest.testCallbackVrS8 { -128 }.should eq(-128)
  end
  # test wrap around
  it "returning :char (128)" do
    LibTest.testCallbackVrS8 { 128 }.should eq(-128)
  end
  it "returning :char (255)" do
    LibTest.testCallbackVrS8 { 0xff }.should eq(-1)
  end
  it "returning :uchar (0)" do
    LibTest.testCallbackVrU8 { 0 }.should eq 0
  end
  it "returning :uchar (0xff)" do
    LibTest.testCallbackVrU8 { 0xff }.should eq 0xff
  end
  it "returning :uchar (-1)" do
    LibTest.testCallbackVrU8 { -1 }.should eq 0xff
  end
  it "returning :uchar (128)" do
    LibTest.testCallbackVrU8 { 128 }.should eq 128
  end
  it "returning :uchar (-128)" do
    LibTest.testCallbackVrU8 { -128 }.should eq 128
  end
  it "returning :short (0)" do
    LibTest.testCallbackVrS16 { 0 }.should eq 0
  end
  it "returning :short (0x7fff)" do
    LibTest.testCallbackVrS16 { 0x7fff }.should eq 0x7fff
  end
  # test wrap around
  it "returning :short (0x8000)" do
    LibTest.testCallbackVrS16 { 0x8000 }.should eq(-0x8000)
  end
  it "returning :short (0xffff)" do
    LibTest.testCallbackVrS16 { 0xffff }.should eq(-1)
  end
  it "returning :ushort (0)" do
    LibTest.testCallbackVrU16 { 0 }.should eq 0
  end
  it "returning :ushort (0x7fff)" do
    LibTest.testCallbackVrU16 { 0x7fff }.should eq 0x7fff
  end
  it "returning :ushort (0x8000)" do
    LibTest.testCallbackVrU16 { 0x8000 }.should eq 0x8000
  end
  it "returning :ushort (0xffff)" do
    LibTest.testCallbackVrU16 { 0xffff }.should eq 0xffff
  end
  it "returning :ushort (-1)" do
    LibTest.testCallbackVrU16 { -1 }.should eq 0xffff
  end
  it "returning :int (0)" do
    LibTest.testCallbackVrS32 { 0 }.should eq 0
  end
  it "returning :int (0x7fffffff)" do
    LibTest.testCallbackVrS32 { 0x7fffffff }.should eq 0x7fffffff
  end
  # test wrap around
  it "returning :int (-0x80000000)" do
    LibTest.testCallbackVrS32 { -0x80000000 }.should eq(-0x80000000)
  end
  it "returning :int (-1)" do
    LibTest.testCallbackVrS32 { -1 }.should eq(-1)
  end
  it "returning :uint (0)" do
    LibTest.testCallbackVrU32 { 0 }.should eq 0
  end
  it "returning :uint (0x7fffffff)" do
    LibTest.testCallbackVrU32 { 0x7fffffff }.should eq 0x7fffffff
  end
  # test wrap around
  it "returning :uint (0x80000000)" do
    LibTest.testCallbackVrU32 { 0x80000000 }.should eq 0x80000000
  end
  it "returning :uint (0xffffffff)" do
    LibTest.testCallbackVrU32 { 0xffffffff }.should eq 0xffffffff
  end
  it "returning :uint (-1)" do
    LibTest.testCallbackVrU32 { -1 }.should eq 0xffffffff
  end
  it "returning :long (0)" do
    LibTest.testCallbackVrL { 0 }.should eq 0
  end
  it "returning :long (0x7fffffff)" do
    LibTest.testCallbackVrL { 0x7fffffff }.should eq 0x7fffffff
  end
  # test wrap around
  it "returning :long (-0x80000000)" do
    LibTest.testCallbackVrL { -0x80000000 }.should eq(-0x80000000)
  end
  it "returning :long (-1)" do
    LibTest.testCallbackVrL { -1 }.should eq(-1)
  end
  it "returning :ulong (0)" do
    LibTest.testCallbackVrUL { 0 }.should eq 0
  end
  it "returning :ulong (0x7fffffff)" do
    LibTest.testCallbackVrUL { 0x7fffffff }.should eq 0x7fffffff
  end
  # test wrap around
  it "returning :ulong (0x80000000)" do
    LibTest.testCallbackVrUL { 0x80000000 }.should eq 0x80000000
  end
  it "returning :ulong (0xffffffff)" do
    LibTest.testCallbackVrUL { 0xffffffff }.should eq 0xffffffff
  end
  it "Callback returning :ulong (-1)" do
    if FFI::Platform::LONG_SIZE == 32
      LibTest.testCallbackVrUL { -1 }.should eq 0xffffffff
    else
      LibTest.testCallbackVrUL { -1 }.should eq 0xffffffffffffffff
    end
  end
  it "returning :long_long (0)" do
    LibTest.testCallbackVrS64 { 0 }.should eq 0
  end
  it "returning :long_long (0x7fffffffffffffff)" do
    LibTest.testCallbackVrS64 { 0x7fffffffffffffff }.should eq 0x7fffffffffffffff
  end
  # test wrap around
  it "returning :long_long (-0x8000000000000000)" do
    LibTest.testCallbackVrS64 { -0x8000000000000000 }.should eq(-0x8000000000000000)
  end
  it "returning :long_long (-1)" do
    LibTest.testCallbackVrS64 { -1 }.should eq(-1)
  end
  it "returning bool" do
    LibTest.testCallbackVrZ { true }.should be_true
  end
  it "returning :pointer (nil)" do
    LibTest.testCallbackVrP { nil }.null?.should be_true
  end
  it "returning :pointer (MemoryPointer)" do
    p = FFI::MemoryPointer.new :long
    LibTest.testCallbackVrP { p }.should eq p
  end


  it "returning struct by value" do
    s = LibTest::S8F32S32.new
    s[:s8] = 0x12
    s[:s32] = 0x1eefbeef
    s[:f32] = 1.234567
    ret = LibTest.testCallbackVrT { s }
    ret[:s8].should eq s[:s8]
    ret[:f32].should eq s[:f32]
    ret[:s32].should eq s[:s32]

  end

  it "struct by value parameter" do
    s = LibTest::S8F32S32.new
    s[:s8] = 0x12
    s[:s32] = 0x1eefbeef
    s[:f32] = 1.234567
    s2 = LibTest::S8F32S32.new
    LibTest.testCallbackTrV(s) do |struct|
      s2[:s8] = struct[:s8]
      s2[:f32] = struct[:f32]
      s2[:s32] = struct[:s32]
    end
  end

  
  it "global variable" do
    proc = Proc.new { 0x1e }
    LibTest.cbVrS8 = proc
    LibTest.testGVarCallbackVrS8(LibTest.pVrS8).should eq 0x1e
  end

  describe "When the callback is considered optional by the underlying library" do
    it "should handle receiving 'nil' in place of the closure" do
      LibTest.testOptionalCallbackCrV(nil, 13)
    end
  end

  describe 'when inlined' do
    it 'could be anonymous' do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        attach_function :testAnonymousCallbackVrS8, :testClosureVrB, [ callback([ ], :char) ], :char
      end
      LibTest.testAnonymousCallbackVrS8 { 0 }.should eq 0
    end
  end

  describe "as return value" do

    it "should not blow up when a callback is defined that returns a callback" do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        callback :cb_return_type_1, [ :short ], :short
        callback :cb_lookup_1, [ :short ], :cb_return_type_1
        attach_function :testReturnsCallback_1, :testReturnsClosure, [ :cb_lookup_1, :short ], :cb_return_type_1
      end      
    end

    it "should return a callback" do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        callback :cb_return_type, [ :int ], :int
        callback :cb_lookup, [ ], :cb_return_type
        attach_function :testReturnsCallback, :testReturnsClosure, [ :cb_lookup, :int ], :int
      end      

      lookup_proc_called = false
      return_proc_called = false

      return_proc = Proc.new do |a|
        return_proc_called = true
        a * 2
      end
      lookup_proc = Proc.new do
        lookup_proc_called = true
        return_proc
      end

      val = LibTest.testReturnsCallback(lookup_proc, 0x1234)
      val.should eq 0x1234 * 2
      lookup_proc_called.should be_true
      return_proc_called.should be_true
    end

    it "should return a method callback" do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        callback :cb_return_type, [ :int ], :int
        callback :cb_lookup, [ ], :cb_return_type
        attach_function :testReturnsCallback_2, :testReturnsClosure, [ :cb_lookup, :int ], :int
      end
      module MethodCallback
        def self.lookup
          method(:perform)
        end
        def self.perform num
          num * 2
        end
      end

      LibTest.testReturnsCallback_2(MethodCallback.method(:lookup), 0x1234).should eq 0x2468
    end

    it 'should not blow up when a callback takes a callback as argument' do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        callback :cb_argument, [ :int ], :int
        callback :cb_with_cb_argument, [ :cb_argument, :int ], :int
        attach_function :testCallbackAsArgument_2, :testArgumentClosure, [ :cb_with_cb_argument, :int ], :int
      end   
    end
    it 'should be able to use the callback argument' do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        callback :cb_argument, [ :int ], :int
        callback :cb_with_cb_argument, [ :cb_argument, :int ], :int
        attach_function :testCallbackAsArgument, :testArgumentClosure, [ :cb_with_cb_argument, :cb_argument, :int ], :int
      end   
      callback_arg_called = false
      callback_with_callback_arg_called = false         
      callback_arg = Proc.new do |val|
        callback_arg_called = true
        val * 2
      end
      callback_with_callback_arg = Proc.new do |cb, val|
        callback_with_callback_arg_called = true
        cb.call(val)
      end
      val = LibTest.testCallbackAsArgument(callback_with_callback_arg, callback_arg, 0xff1)
      val.should eq 0xff1 * 2
      callback_arg_called.should be_true
      callback_with_callback_arg_called.should be_true         
    end
    it 'function returns callable object' do
      module LibTest
        extend FFI::Library
        ffi_lib TestLibrary::PATH
        callback :funcptr, [ :int ], :int
        attach_function :testReturnsFunctionPointer, [  ], :funcptr
      end
      f = LibTest.testReturnsFunctionPointer
      f.call(3).should eq 6
    end
  end

end


describe "Callback with " do
  #
  # Test callbacks that take an argument, returning void
  #
  module LibTest
    extend FFI::Library
    ffi_lib TestLibrary::PATH

    class S8F32S32 < FFI::Struct
      layout :s8, :char, :f32, :float, :s32, :int
    end

    callback :cbS8rV, [ :char ], :void
    callback :cbU8rV, [ :uchar ], :void
    callback :cbS16rV, [ :short ], :void
    callback :cbU16rV, [ :ushort ], :void

    callback :cbZrV, [ :bool ], :void
    callback :cbS32rV, [ :int ], :void
    callback :cbU32rV, [ :uint ], :void

    callback :cbLrV, [ :long ], :void
    callback :cbULrV, [ :ulong ], :void
    callback :cbArV, [ :string ], :void
    callback :cbPrV, [ :pointer], :void
    callback :cbYrV, [ S8F32S32.ptr ], :void

    callback :cbS64rV, [ :long_long ], :void
    attach_function :testCallbackCrV, :testClosureBrV, [ :cbS8rV, :char ], :void
    attach_function :testCallbackU8rV, :testClosureBrV, [ :cbU8rV, :uchar ], :void
    attach_function :testCallbackSrV, :testClosureSrV, [ :cbS16rV, :short ], :void
    attach_function :testCallbackU16rV, :testClosureSrV, [ :cbU16rV, :ushort ], :void
    attach_function :testCallbackZrV, :testClosureZrV, [ :cbZrV, :bool ], :void
    attach_function :testCallbackIrV, :testClosureIrV, [ :cbS32rV, :int ], :void
    attach_function :testCallbackU32rV, :testClosureIrV, [ :cbU32rV, :uint ], :void

    attach_function :testCallbackLrV, :testClosureLrV, [ :cbLrV, :long ], :void
    attach_function :testCallbackULrV, :testClosureULrV, [ :cbULrV, :ulong ], :void

    attach_function :testCallbackLLrV, :testClosureLLrV, [ :cbS64rV, :long_long ], :void
    attach_function :testCallbackArV, :testClosurePrV, [ :cbArV, :string ], :void
    attach_function :testCallbackPrV, :testClosurePrV, [ :cbPrV, :pointer], :void
    attach_function :testCallbackYrV, :testClosurePrV, [ :cbYrV, S8F32S32.in ], :void
  end
  it "function with Callback plus another arg should raise error if no arg given" do
    lambda { LibTest.testCallbackCrV { |*a| }}.should raise_error
  end
  it ":char (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackCrV(0) { |i| v = i }
    v.should eq 0
  end
  it ":char (127) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackCrV(127) { |i| v = i }
    v.should eq 127
  end
  it ":char (-128) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackCrV(-128) { |i| v = i }
    v.should eq(-128)
  end
  it ":char (-1) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackCrV(-1) { |i| v = i }
    v.should eq(-1)
  end
  it ":uchar (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU8rV(0) { |i| v = i }
    v.should eq 0
  end
  it ":uchar (127) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU8rV(127) { |i| v = i }
    v.should eq 127
  end
  it ":uchar (128) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU8rV(128) { |i| v = i }
    v.should eq 128
  end
  it ":uchar (255) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU8rV(255) { |i| v = i }
    v.should eq 255
  end

  it ":short (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackSrV(0) { |i| v = i }
    v.should eq 0
  end
  it ":short (0x7fff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackSrV(0x7fff) { |i| v = i }
    v.should eq 0x7fff
  end
  it ":short (-0x8000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackSrV(-0x8000) { |i| v = i }
    v.should eq(-0x8000)
  end
  it ":short (-1) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackSrV(-1) { |i| v = i }
    v.should eq(-1)
  end
  it ":ushort (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU16rV(0) { |i| v = i }
    v.should eq 0
  end
  it ":ushort (0x7fff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU16rV(0x7fff) { |i| v = i }
    v.should eq 0x7fff
  end
  it ":ushort (0x8000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU16rV(0x8000) { |i| v = i }
    v.should eq 0x8000
  end
  it ":ushort (0xffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU16rV(0xffff) { |i| v = i }
    v.should eq 0xffff
  end
  it ":bool (true) argument" do
    v = false
    LibTest.testCallbackZrV(true) { |i| v = i }
    v.should be_true
  end
  it ":int (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackIrV(0) { |i| v = i }
    v.should eq 0
  end
  it ":int (0x7fffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackIrV(0x7fffffff) { |i| v = i }
    v.should eq 0x7fffffff
  end
  it ":int (-0x80000000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackIrV(-0x80000000) { |i| v = i }
    v.should eq(-0x80000000)
  end
  it ":int (-1) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackIrV(-1) { |i| v = i }
    v.should eq(-1)
  end
  it ":uint (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU32rV(0) { |i| v = i }
    v.should eq 0
  end
  it ":uint (0x7fffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU32rV(0x7fffffff) { |i| v = i }
    v.should eq 0x7fffffff
  end
  it ":uint (0x80000000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU32rV(0x80000000) { |i| v = i }
    v.should eq 0x80000000
  end
  it ":uint (0xffffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackU32rV(0xffffffff) { |i| v = i }
    v.should eq 0xffffffff
  end
  it ":long (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLrV(0) { |i| v = i }
    v.should eq 0
  end
  it ":long (0x7fffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLrV(0x7fffffff) { |i| v = i }
    v.should eq 0x7fffffff
  end
  it ":long (-0x80000000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLrV(-0x80000000) { |i| v = i }
    v.should eq(-0x80000000)
  end
  it ":long (-1) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLrV(-1) { |i| v = i }
    v.should eq(-1)
  end
  it ":ulong (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackULrV(0) { |i| v = i }
    v.should eq 0
  end
  it ":ulong (0x7fffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackULrV(0x7fffffff) { |i| v = i }
    v.should eq 0x7fffffff
  end
  it ":ulong (0x80000000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackULrV(0x80000000) { |i| v = i }
    v.should eq 0x80000000
  end
  it ":ulong (0xffffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackULrV(0xffffffff) { |i| v = i }
    v.should eq 0xffffffff
  end
  it ":long_long (0) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLLrV(0) { |i| v = i }
    v.should eq 0
  end
  it ":long_long (0x7fffffffffffffff) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLLrV(0x7fffffffffffffff) { |i| v = i }
    v.should eq 0x7fffffffffffffff
  end
  it ":long_long (-0x8000000000000000) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLLrV(-0x8000000000000000) { |i| v = i }
    v.should eq(-0x8000000000000000)
  end
  it ":long_long (-1) argument" do
    v = 0xdeadbeef
    LibTest.testCallbackLLrV(-1) { |i| v = i }
    v.should eq(-1)
  end
  it ":string argument" do
    v = nil
    LibTest.testCallbackArV("Hello, World") { |i| v = i }
    v.should eq "Hello, World"
  end
  it ":string (nil) argument" do
    v = "Hello, World"
    LibTest.testCallbackArV(nil) { |i| v = i }
    v.should be_nil
  end
  it ":pointer argument" do
    v = nil
    magic = FFI::Pointer.new(0xdeadbeef)
    LibTest.testCallbackPrV(magic) { |i| v = i }
    v.should eq magic
  end
  it ":pointer (nil) argument" do
    v = "Hello, World"
    LibTest.testCallbackPrV(nil) { |i| v = i }
    v.should eq FFI::Pointer::NULL
  end
  it "struct by reference argument" do
    v = nil
    magic = LibTest::S8F32S32.new
    LibTest.testCallbackYrV(magic) { |i| v = i }
    v.class.should eq magic.class
    v.pointer == magic.pointer
  end

  it "struct by reference argument with nil value" do
    v = LibTest::S8F32S32.new
    LibTest.testCallbackYrV(nil) { |i| v = i }
    v.is_a?(FFI::Struct).should be_true
    v.pointer.should eq FFI::Pointer::NULL
  end

end # unless true