1try:
2    import ustruct as struct
3except:
4    try:
5        import struct
6    except ImportError:
7        print("SKIP")
8        raise SystemExit
9
10# check maximum pack on 32-bit machine
11print(struct.pack("<I", 2**32 - 1))
12print(struct.pack("<I", 0xffffffff))
13
14# long long ints
15print(struct.pack("<Q", 1))
16print(struct.pack(">Q", 1))
17print(struct.pack("<Q", 2**64 - 1))
18print(struct.pack(">Q", 2**64 - 1))
19print(struct.pack("<Q", 0xffffffffffffffff))
20print(struct.pack(">Q", 0xffffffffffffffff))
21print(struct.pack("<q", -1))
22print(struct.pack(">q", -1))
23print(struct.pack("<Q", 1234567890123456789))
24print(struct.pack("<q", -1234567890123456789))
25print(struct.pack(">Q", 1234567890123456789))
26print(struct.pack(">q", -1234567890123456789))
27print(struct.unpack("<Q", b"\x12\x34\x56\x78\x90\x12\x34\x56"))
28print(struct.unpack(">Q", b"\x12\x34\x56\x78\x90\x12\x34\x56"))
29print(struct.unpack("<q", b"\x12\x34\x56\x78\x90\x12\x34\xf6"))
30print(struct.unpack(">q", b"\xf2\x34\x56\x78\x90\x12\x34\x56"))
31
32# check maximum unpack
33print(struct.unpack("<I", b"\xff\xff\xff\xff"))
34print(struct.unpack("<Q", b"\xff\xff\xff\xff\xff\xff\xff\xff"))
35
36# check small int overflow
37print(struct.unpack("<i", b'\xff\xff\xff\x7f'))
38print(struct.unpack("<q", b'\xff\xff\xff\xff\xff\xff\xff\x7f'))
39
40# test with negative big integers that are actually small in magnitude
41bigzero = (1 << 70) - (1 << 70)
42for endian in "<>":
43    for type_ in "bhiq":
44        fmt = endian + type_
45        b = struct.pack(fmt, -2 + bigzero)
46        print(fmt, b, struct.unpack(fmt, b))
47