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require 'ffi'
describe "Struct aligns fields correctly" do
it "char, followed by an int" do
class CIStruct < FFI::Struct
layout :c => :char, :i => :int
end
CIStruct.size.should == 8
end
it "short, followed by an int" do
class SIStruct < FFI::Struct
layout :s => :short, :i => :int
end
SIStruct.size.should == 8
end
it "int, followed by an int" do
class IIStruct < FFI::Struct
layout :i1 => :int, :i => :int
end
IIStruct.size.should == 8
end
it "long long, followed by an int" do
class LLIStruct < FFI::Struct
layout :l => :long_long, :i => :int
end
LLIStruct.size.should == (FFI::TYPE_UINT64.alignment == 4 ? 12 : 16)
end
end
describe "Struct tests" do
StructTypes = {
's8' => :char,
's16' => :short,
's32' => :int,
's64' => :long_long,
'long' => :long,
'f32' => :float,
'f64' => :double
}
class PointerMember < FFI::Struct
layout :pointer, :pointer
end
class StringMember < FFI::Struct
layout :string, :string
end
it "Struct#[:pointer]" do
magic = 0x12345678
mp = FFI::MemoryPointer.new :long
mp.put_long(0, magic)
smp = FFI::MemoryPointer.new :pointer
smp.put_pointer(0, mp)
s = PointerMember.new smp
s[:pointer].should == mp
end
it "Struct#[:pointer].nil? for NULL value" do
magic = 0x12345678
mp = FFI::MemoryPointer.new :long
mp.put_long(0, magic)
smp = FFI::MemoryPointer.new :pointer
smp.put_pointer(0, nil)
s = PointerMember.new smp
s[:pointer].null?.should == true
end
it "Struct#[:pointer]=" do
magic = 0x12345678
mp = FFI::MemoryPointer.new :long
mp.put_long(0, magic)
smp = FFI::MemoryPointer.new :pointer
s = PointerMember.new smp
s[:pointer] = mp
smp.get_pointer(0).should == mp
end
it "Struct#[:pointer]=struct" do
magic = 0x12345678
smp = FFI::MemoryPointer.new :pointer
s = PointerMember.new smp
lambda { s[:pointer] = s }.should_not raise_error
foo = s[:pointer] # should not crash with a java.lang.ClassCastException: org.jruby.ext.ffi.Struct cannot be cast to org.jruby.ext.ffi.AbstractMemory
end
it "Struct#[:pointer]=nil" do
smp = FFI::MemoryPointer.new :pointer
s = PointerMember.new smp
s[:pointer] = nil
smp.get_pointer(0).null?.should == true
end
it "Struct#[:string]" do
magic = "test"
mp = FFI::MemoryPointer.new 1024
mp.put_string(0, magic)
smp = FFI::MemoryPointer.new :pointer
smp.put_pointer(0, mp)
s = StringMember.new smp
s[:string].should == magic
end
it "Struct#[:string].nil? for NULL value" do
smp = FFI::MemoryPointer.new :pointer
smp.put_pointer(0, nil)
s = StringMember.new smp
s[:string].nil?.should == true
end
it "Struct#layout works with :name, :type pairs" do
class PairLayout < FFI::Struct
layout :a, :int, :b, :long_long
end
ll_off = (FFI::TYPE_UINT64.alignment == 4 ? 4 : 8)
PairLayout.size.should == (ll_off + 8)
mp = FFI::MemoryPointer.new(PairLayout.size)
s = PairLayout.new mp
s[:a] = 0x12345678
mp.get_int(0).should == 0x12345678
s[:b] = 0xfee1deadbeef
mp.get_int64(ll_off).should == 0xfee1deadbeef
end
it "Struct#layout works with :name, :type, offset tuples" do
class PairLayout < FFI::Struct
layout :a, :int, 0, :b, :long_long, 4
end
PairLayout.size.should == (FFI::TYPE_UINT64.alignment == 4 ? 12 : 16)
mp = FFI::MemoryPointer.new(PairLayout.size)
s = PairLayout.new mp
s[:a] = 0x12345678
mp.get_int(0).should == 0x12345678
s[:b] = 0xfee1deadbeef
mp.get_int64(4).should == 0xfee1deadbeef
end
it "Struct#layout works with mixed :name,:type and :name,:type,offset" do
class MixedLayout < FFI::Struct
layout :a, :int, :b, :long_long, 4
end
MixedLayout.size.should == (FFI::TYPE_UINT64.alignment == 4 ? 12 : 16)
mp = FFI::MemoryPointer.new(MixedLayout.size)
s = MixedLayout.new mp
s[:a] = 0x12345678
mp.get_int(0).should == 0x12345678
s[:b] = 0xfee1deadbeef
mp.get_int64(4).should == 0xfee1deadbeef
end
rb_maj, rb_min = RUBY_VERSION.split('.')
if rb_maj.to_i >= 1 && rb_min.to_i >= 9 || RUBY_PLATFORM =~ /java/
it "Struct#layout withs with a hash of :name => type" do
class HashLayout < FFI::Struct
layout :a => :int, :b => :long_long
end
ll_off = (FFI::TYPE_UINT64.alignment == 4 ? 4 : 8)
HashLayout.size.should == (ll_off + 8)
mp = FFI::MemoryPointer.new(HashLayout.size)
s = HashLayout.new mp
s[:a] = 0x12345678
mp.get_int(0).should == 0x12345678
s[:b] = 0xfee1deadbeef
mp.get_int64(ll_off).should == 0xfee1deadbeef
end
end
def test_num_field(type, v)
klass = Class.new(FFI::Struct)
klass.layout :v, type, :dummy, :long
s = klass.new
s[:v] = v
s.pointer.send("get_#{type.to_s}", 0).should == v
s.pointer.send("put_#{type.to_s}", 0, 0)
s[:v].should == 0
end
def self.int_field_test(type, values)
values.each do |v|
it "#{type} field r/w (#{v.to_s(16)})" do
test_num_field(type, v)
end
end
end
int_field_test(:char, [ 0, 127, -128, -1 ])
int_field_test(:uchar, [ 0, 0x7f, 0x80, 0xff ])
int_field_test(:short, [ 0, 0x7fff, -0x8000, -1 ])
int_field_test(:ushort, [ 0, 0x7fff, 0x8000, 0xffff ])
int_field_test(:int, [ 0, 0x7fffffff, -0x80000000, -1 ])
int_field_test(:uint, [ 0, 0x7fffffff, 0x80000000, 0xffffffff ])
int_field_test(:long_long, [ 0, 0x7fffffffffffffff, -0x8000000000000000, -1 ])
int_field_test(:ulong_long, [ 0, 0x7fffffffffffffff, 0x8000000000000000, 0xffffffffffffffff ])
if FFI::Platform::LONG_SIZE == 32
int_field_test(:long, [ 0, 0x7fffffff, -0x80000000, -1 ])
int_field_test(:ulong, [ 0, 0x7fffffff, 0x80000000, 0xffffffff ])
else
int_field_test(:long, [ 0, 0x7fffffffffffffff, -0x8000000000000000, -1 ])
int_field_test(:ulong, [ 0, 0x7fffffffffffffff, 0x8000000000000000, 0xffffffffffffffff ])
end
it ":float field r/w" do
klass = Class.new(FFI::Struct)
klass.layout :v, :float, :dummy, :long
s = klass.new
value = 1.23456
s[:v] = value
(s.pointer.get_float(0) - value).abs.should < 0.0001
end
it ":double field r/w" do
klass = Class.new(FFI::Struct)
klass.layout :v, :double, :dummy, :long
s = klass.new
value = 1.23456
s[:v] = value
(s.pointer.get_double(0) - value).abs.should < 0.0001
end
it "Can return its members as a list" do
class TestStruct < FFI::Struct
layout :a, :int, :b, :int, :c, :int
end
TestStruct.members.should include(:a, :b, :c)
end
it "Can return its instance members and values as lists" do
class TestStruct < FFI::Struct
layout :a, :int, :b, :int, :c, :int
end
s = TestStruct.new
s.members.should include(:a, :b, :c)
s[:a] = 1
s[:b] = 2
s[:c] = 3
s.values.should include(1, 2, 3)
end
it 'should return an ordered field/offset pairs array' do
class TestStruct < FFI::Struct
layout :a, :int, :b, :int, :c, :int
end
s = TestStruct.new
s.offsets.should == [[:a, 0], [:b, 4], [:c, 8]]
TestStruct.offsets.should == [[:a, 0], [:b, 4], [:c, 8]]
end
it "Struct#offset_of returns offset of field within struct" do
class TestStruct < FFI::Struct
layout :a, :int, :b, :int, :c, :int
end
TestStruct.offset_of(:a).should == 0
TestStruct.offset_of(:b).should == 4
TestStruct.offset_of(:c).should == 8
end
end
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