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require_relative 'helper'
require 'fiddle/struct'
module Fiddle
class TestCStructEntity < TestCase
def test_class_size
types = [TYPE_DOUBLE, TYPE_CHAR]
size = CStructEntity.size types
alignments = types.map { |type| PackInfo::ALIGN_MAP[type] }
expected = PackInfo.align 0, alignments[0]
expected += PackInfo::SIZE_MAP[TYPE_DOUBLE]
expected = PackInfo.align expected, alignments[1]
expected += PackInfo::SIZE_MAP[TYPE_CHAR]
expected = PackInfo.align expected, alignments.max
assert_equal expected, size
end
def test_class_size_with_count
size = CStructEntity.size([[TYPE_DOUBLE, 2], [TYPE_CHAR, 20]])
types = [TYPE_DOUBLE, TYPE_CHAR]
alignments = types.map { |type| PackInfo::ALIGN_MAP[type] }
expected = PackInfo.align 0, alignments[0]
expected += PackInfo::SIZE_MAP[TYPE_DOUBLE] * 2
expected = PackInfo.align expected, alignments[1]
expected += PackInfo::SIZE_MAP[TYPE_CHAR] * 20
expected = PackInfo.align expected, alignments.max
assert_equal expected, size
end
def test_set_ctypes
union = CStructEntity.malloc [TYPE_INT, TYPE_LONG]
union.assign_names %w[int long]
# this test is roundabout because the stored ctypes are not accessible
union['long'] = 1
union['int'] = 2
assert_equal 1, union['long']
assert_equal 2, union['int']
end
def test_aref_pointer_array
team = CStructEntity.malloc([[TYPE_VOIDP, 2]])
team.assign_names(["names"])
alice = Fiddle::Pointer.malloc(6)
alice[0, 6] = "Alice\0"
bob = Fiddle::Pointer.malloc(4)
bob[0, 4] = "Bob\0"
team["names"] = [alice, bob]
assert_equal(["Alice", "Bob"], team["names"].map(&:to_s))
end
def test_aref_pointer
user = CStructEntity.malloc([TYPE_VOIDP])
user.assign_names(["name"])
alice = Fiddle::Pointer.malloc(6)
alice[0, 6] = "Alice\0"
user["name"] = alice
assert_equal("Alice", user["name"].to_s)
end
end
end
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