try: import ustruct as struct except: try: import struct except ImportError: print("SKIP") raise SystemExit # check maximum pack on 32-bit machine print(struct.pack("<I", 2**32 - 1)) print(struct.pack("<I", 0xffffffff)) # long long ints print(struct.pack("<Q", 1)) print(struct.pack(">Q", 1)) print(struct.pack("<Q", 2**64 - 1)) print(struct.pack(">Q", 2**64 - 1)) print(struct.pack("<Q", 0xffffffffffffffff)) print(struct.pack(">Q", 0xffffffffffffffff)) print(struct.pack("<q", -1)) print(struct.pack(">q", -1)) print(struct.pack("<Q", 1234567890123456789)) print(struct.pack("<q", -1234567890123456789)) print(struct.pack(">Q", 1234567890123456789)) print(struct.pack(">q", -1234567890123456789)) print(struct.unpack("<Q", b"\x12\x34\x56\x78\x90\x12\x34\x56")) print(struct.unpack(">Q", b"\x12\x34\x56\x78\x90\x12\x34\x56")) print(struct.unpack("<q", b"\x12\x34\x56\x78\x90\x12\x34\xf6")) print(struct.unpack(">q", b"\xf2\x34\x56\x78\x90\x12\x34\x56")) # check maximum unpack print(struct.unpack("<I", b"\xff\xff\xff\xff")) print(struct.unpack("<Q", b"\xff\xff\xff\xff\xff\xff\xff\xff")) # check small int overflow print(struct.unpack("<i", b'\xff\xff\xff\x7f')) print(struct.unpack("<q", b'\xff\xff\xff\xff\xff\xff\xff\x7f')) # test with negative big integers that are actually small in magnitude bigzero = (1 << 70) - (1 << 70) for endian in "<>": for type_ in "bhiq": fmt = endian + type_ b = struct.pack(fmt, -2 + bigzero) print(fmt, b, struct.unpack(fmt, b))