def test_null_pointers():
NULL = '\x00\x00\x00\x00\x00\x00\x00\x00' # NULL pointer
builder = Builder(0, 3)
builder.alloc_struct(0, Struct, None)
builder.alloc_text(8, None)
builder.alloc_list(16, PrimitiveItemType(Types.int64), None)
buf = builder.build()
assert buf == NULL * 3
def test_alloc_struct():
class MyStruct(Struct):
__static_data_size__ = 2
__static_ptrs_size__ = 0
mybuf = ('\x01\x00\x00\x00\x00\x00\x00\x00'
'\x02\x00\x00\x00\x00\x00\x00\x00')
mystruct = MyStruct.from_buffer(mybuf, 0, 2, 0)
#
builder = Builder(0, 1)
builder.alloc_struct(0, MyStruct, mystruct)
buf = builder.build()
assert buf == (
'\x00\x00\x00\x00\x02\x00\x00\x00' # ptr to mystruct
+ mybuf)
def test_alloc_struct_evolution():
class MyStruct(Struct):
__static_data_size__ = 2
__static_ptrs_size__ = 0
# MyStruct has a static size of (2, 0), but the actual object comes from
# the future and has an actual size of (3, 1)
mybuf = (
'\x01\x00\x00\x00\x00\x00\x00\x00'
'\x02\x00\x00\x00\x00\x00\x00\x00'
'\x03\x00\x00\x00\x00\x00\x00\x00' # new field
'\x01\x00\x00\x00\x22\x00\x00\x00' # new field
'foo\x00\x00\x00\x00\x00') # new field
mystruct = MyStruct.from_buffer(mybuf, 0, 3, 1)
#
builder = Builder(0, 1)
builder.alloc_struct(0, MyStruct, mystruct)
buf = builder.build()
assert buf == (
'\x00\x00\x00\x00\x03\x00\x01\x00' # ptr of size (3, 1)
+ mybuf)