Pillow/Tests/test_lib_pack.py

import sys

from .helper import PillowTestCase

from PIL import Image


X = 255


class TestLibPack(PillowTestCase):
    def assert_pack(self, mode, rawmode, data, *pixels):
        """
        data - either raw bytes with data or just number of bytes in rawmode.
        """
        im = Image.new(mode, (len(pixels), 1))
        for x, pixel in enumerate(pixels):
            im.putpixel((x, 0), pixel)

        if isinstance(data, int):
            data_len = data * len(pixels)
            data = bytes(bytearray(range(1, data_len + 1)))

        self.assertEqual(data, im.tobytes("raw", rawmode))

    def test_1(self):
        self.assert_pack("1", "1", b'\x01', 0, 0, 0, 0, 0, 0, 0, X)
        self.assert_pack("1", "1;I", b'\x01', X, X, X, X, X, X, X, 0)
        self.assert_pack("1", "1;R", b'\x01', X, 0, 0, 0, 0, 0, 0, 0)
        self.assert_pack("1", "1;IR", b'\x01', 0, X, X, X, X, X, X, X)

        self.assert_pack("1", "1", b'\xaa', X, 0, X, 0, X, 0, X, 0)
        self.assert_pack("1", "1;I", b'\xaa', 0, X, 0, X, 0, X, 0, X)
        self.assert_pack("1", "1;R", b'\xaa', 0, X, 0, X, 0, X, 0, X)
        self.assert_pack("1", "1;IR", b'\xaa', X, 0, X, 0, X, 0, X, 0)

        self.assert_pack(
            "1", "L", b'\xff\x00\x00\xff\x00\x00', X, 0, 0, X, 0, 0)

    def test_L(self):
        self.assert_pack("L", "L", 1, 1, 2, 3, 4)
        self.assert_pack("L", "L;16", b'\x00\xc6\x00\xaf', 198, 175)
        self.assert_pack("L", "L;16B", b'\xc6\x00\xaf\x00', 198, 175)

    def test_LA(self):
        self.assert_pack("LA", "LA", 2, (1, 2), (3, 4), (5, 6))
        self.assert_pack("LA", "LA;L", 2, (1, 4), (2, 5), (3, 6))

    def test_P(self):
        self.assert_pack("P", "P;1", b'\xe4', 1, 1, 1, 0, 0, 255, 0, 0)
        self.assert_pack("P", "P;2", b'\xe4', 3, 2, 1, 0)
        self.assert_pack("P", "P;4", b'\x02\xef', 0, 2, 14, 15)
        self.assert_pack("P", "P", 1, 1, 2, 3, 4)

    def test_PA(self):
        self.assert_pack("PA", "PA", 2, (1, 2), (3, 4), (5, 6))
        self.assert_pack("PA", "PA;L", 2, (1, 4), (2, 5), (3, 6))

    def test_RGB(self):
        self.assert_pack("RGB", "RGB", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
        self.assert_pack(
            "RGB", "RGBX",
            b'\x01\x02\x03\xff\x05\x06\x07\xff', (1, 2, 3), (5, 6, 7))
        self.assert_pack(
            "RGB", "XRGB",
            b'\x00\x02\x03\x04\x00\x06\x07\x08', (2, 3, 4), (6, 7, 8))
        self.assert_pack("RGB", "BGR", 3, (3, 2, 1), (6, 5, 4), (9, 8, 7))
        self.assert_pack(
            "RGB", "BGRX",
            b'\x01\x02\x03\x00\x05\x06\x07\x00', (3, 2, 1), (7, 6, 5))
        self.assert_pack(
            "RGB", "XBGR",
            b'\x00\x02\x03\x04\x00\x06\x07\x08', (4, 3, 2), (8, 7, 6))
        self.assert_pack("RGB", "RGB;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
        self.assert_pack("RGB", "R", 1, (1, 9, 9), (2, 9, 9), (3, 9, 9))
        self.assert_pack("RGB", "G", 1, (9, 1, 9), (9, 2, 9), (9, 3, 9))
        self.assert_pack("RGB", "B", 1, (9, 9, 1), (9, 9, 2), (9, 9, 3))

    def test_RGBA(self):
        self.assert_pack(
            "RGBA", "RGBA", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_pack(
            "RGBA", "RGBA;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12))
        self.assert_pack(
            "RGBA", "RGB", 3, (1, 2, 3, 14), (4, 5, 6, 15), (7, 8, 9, 16))
        self.assert_pack(
            "RGBA", "BGR", 3, (3, 2, 1, 14), (6, 5, 4, 15), (9, 8, 7, 16))
        self.assert_pack(
            "RGBA", "BGRA", 4,
            (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12))
        self.assert_pack(
            "RGBA", "ABGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9))
        self.assert_pack(
            "RGBA", "BGRa", 4,
            (191, 127, 63, 4), (223, 191, 159, 8), (233, 212, 191, 12))
        self.assert_pack(
            "RGBA", "R", 1, (1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0))
        self.assert_pack(
            "RGBA", "G", 1, (6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9))
        self.assert_pack(
            "RGBA", "B", 1, (6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9))
        self.assert_pack(
            "RGBA", "A", 1, (6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3))

    def test_RGBa(self):
        self.assert_pack(
            "RGBa", "RGBa", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_pack(
            "RGBa", "BGRa", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12))
        self.assert_pack(
            "RGBa", "aBGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9))

    def test_RGBX(self):
        self.assert_pack(
            "RGBX", "RGBX", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_pack(
            "RGBX", "RGBX;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12))
        self.assert_pack(
            "RGBX", "RGB", 3, (1, 2, 3, X), (4, 5, 6, X), (7, 8, 9, X))
        self.assert_pack(
            "RGBX", "BGR", 3, (3, 2, 1, X), (6, 5, 4, X), (9, 8, 7, X))
        self.assert_pack(
            "RGBX", "BGRX",
            b'\x01\x02\x03\x00\x05\x06\x07\x00\t\n\x0b\x00',
            (3, 2, 1, X), (7, 6, 5, X), (11, 10, 9, X))
        self.assert_pack(
            "RGBX", "XBGR",
            b'\x00\x02\x03\x04\x00\x06\x07\x08\x00\n\x0b\x0c',
            (4, 3, 2, X), (8, 7, 6, X), (12, 11, 10, X))
        self.assert_pack("RGBX", "R", 1,
                         (1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0))
        self.assert_pack("RGBX", "G", 1,
                         (6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9))
        self.assert_pack("RGBX", "B", 1,
                         (6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9))
        self.assert_pack("RGBX", "X", 1,
                         (6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3))

    def test_CMYK(self):
        self.assert_pack("CMYK", "CMYK", 4,
                         (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_pack(
            "CMYK", "CMYK;I", 4,
            (254, 253, 252, 251), (250, 249, 248, 247), (246, 245, 244, 243))
        self.assert_pack(
            "CMYK", "CMYK;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12))
        self.assert_pack("CMYK", "K", 1,
                         (6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3))

    def test_YCbCr(self):
        self.assert_pack("YCbCr", "YCbCr", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
        self.assert_pack("YCbCr", "YCbCr;L", 3,
                         (1, 4, 7), (2, 5, 8), (3, 6, 9))
        self.assert_pack(
            "YCbCr", "YCbCrX",
            b'\x01\x02\x03\xff\x05\x06\x07\xff\t\n\x0b\xff',
            (1, 2, 3), (5, 6, 7), (9, 10, 11))
        self.assert_pack(
            "YCbCr", "YCbCrK",
            b'\x01\x02\x03\xff\x05\x06\x07\xff\t\n\x0b\xff',
            (1, 2, 3), (5, 6, 7), (9, 10, 11))
        self.assert_pack("YCbCr", "Y", 1,
                         (1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0))
        self.assert_pack("YCbCr", "Cb", 1,
                         (6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9))
        self.assert_pack("YCbCr", "Cr", 1,
                         (6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9))

    def test_LAB(self):
        self.assert_pack(
            "LAB", "LAB", 3, (1, 130, 131), (4, 133, 134), (7, 136, 137))
        self.assert_pack("LAB", "L", 1, (1, 9, 9), (2, 9, 9), (3, 9, 9))
        self.assert_pack("LAB", "A", 1, (9, 1, 9), (9, 2, 9), (9, 3, 9))
        self.assert_pack("LAB", "B", 1, (9, 9, 1), (9, 9, 2), (9, 9, 3))

    def test_HSV(self):
        self.assert_pack("HSV", "HSV", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
        self.assert_pack("HSV", "H", 1, (1, 9, 9), (2, 9, 9), (3, 9, 9))
        self.assert_pack("HSV", "S", 1, (9, 1, 9), (9, 2, 9), (9, 3, 9))
        self.assert_pack("HSV", "V", 1, (9, 9, 1), (9, 9, 2), (9, 9, 3))

    def test_I(self):
        self.assert_pack("I", "I;16B", 2, 0x0102, 0x0304)
        self.assert_pack(
            "I", "I;32S",
            b'\x83\x00\x00\x01\x01\x00\x00\x83', 0x01000083, -2097151999)

        if sys.byteorder == 'little':
            self.assert_pack("I", "I", 4, 0x04030201, 0x08070605)
            self.assert_pack(
                "I", "I;32NS",
                b'\x83\x00\x00\x01\x01\x00\x00\x83', 0x01000083, -2097151999)
        else:
            self.assert_pack("I", "I", 4, 0x01020304, 0x05060708)
            self.assert_pack(
                "I", "I;32NS",
                b'\x83\x00\x00\x01\x01\x00\x00\x83', -2097151999, 0x01000083)

    def test_F_float(self):
        self.assert_pack(
            "F", "F;32F", 4, 1.539989614439558e-36, 4.063216068939723e-34)

        if sys.byteorder == 'little':
            self.assert_pack(
                "F", "F", 4, 1.539989614439558e-36, 4.063216068939723e-34)
            self.assert_pack(
                "F", "F;32NF", 4, 1.539989614439558e-36, 4.063216068939723e-34)
        else:
            self.assert_pack(
                "F", "F", 4, 2.387939260590663e-38, 6.301941157072183e-36)
            self.assert_pack(
                "F", "F;32NF", 4, 2.387939260590663e-38, 6.301941157072183e-36)


class TestLibUnpack(PillowTestCase):
    def assert_unpack(self, mode, rawmode, data, *pixels):
        """
        data - either raw bytes with data or just number of bytes in rawmode.
        """
        if isinstance(data, int):
            data_len = data * len(pixels)
            data = bytes(bytearray(range(1, data_len + 1)))

        im = Image.frombytes(mode, (len(pixels), 1), data,
                             "raw", rawmode, 0, 1)

        for x, pixel in enumerate(pixels):
            self.assertEqual(pixel, im.getpixel((x, 0)))

    def test_1(self):
        self.assert_unpack("1", "1", b'\x01', 0, 0, 0, 0, 0, 0, 0, X)
        self.assert_unpack("1", "1;I", b'\x01', X, X, X, X, X, X, X, 0)
        self.assert_unpack("1", "1;R", b'\x01', X, 0, 0, 0, 0, 0, 0, 0)
        self.assert_unpack("1", "1;IR", b'\x01', 0, X, X, X, X, X, X, X)

        self.assert_unpack("1", "1", b'\xaa', X, 0, X, 0, X, 0, X, 0)
        self.assert_unpack("1", "1;I", b'\xaa', 0, X, 0, X, 0, X, 0, X)
        self.assert_unpack("1", "1;R", b'\xaa', 0, X, 0, X, 0, X, 0, X)
        self.assert_unpack("1", "1;IR", b'\xaa', X, 0, X, 0, X, 0, X, 0)

        self.assert_unpack("1", "1;8", b'\x00\x01\x02\xff', 0, X, X, X)

    def test_L(self):
        self.assert_unpack("L", "L;2", b'\xe4', 255, 170, 85, 0)
        self.assert_unpack("L", "L;2I", b'\xe4', 0, 85, 170, 255)
        self.assert_unpack("L", "L;2R", b'\xe4', 0, 170, 85, 255)
        self.assert_unpack("L", "L;2IR", b'\xe4', 255, 85, 170, 0)

        self.assert_unpack("L", "L;4", b'\x02\xef', 0, 34, 238, 255)
        self.assert_unpack("L", "L;4I", b'\x02\xef', 255, 221, 17, 0)
        self.assert_unpack("L", "L;4R", b'\x02\xef', 68, 0, 255, 119)
        self.assert_unpack("L", "L;4IR", b'\x02\xef', 187, 255, 0, 136)

        self.assert_unpack("L", "L", 1, 1, 2, 3, 4)
        self.assert_unpack("L", "L;I", 1, 254, 253, 252, 251)
        self.assert_unpack("L", "L;R", 1, 128, 64, 192, 32)
        self.assert_unpack("L", "L;16", 2, 2, 4, 6, 8)
        self.assert_unpack("L", "L;16B", 2, 1, 3, 5, 7)
        self.assert_unpack("L", "L;16", b'\x00\xc6\x00\xaf', 198, 175)
        self.assert_unpack("L", "L;16B", b'\xc6\x00\xaf\x00', 198, 175)

    def test_LA(self):
        self.assert_unpack("LA", "LA", 2, (1, 2), (3, 4), (5, 6))
        self.assert_unpack("LA", "LA;L", 2, (1, 4), (2, 5), (3, 6))

    def test_P(self):
        self.assert_unpack("P", "P;1", b'\xe4', 1, 1, 1, 0, 0, 1, 0, 0)
        self.assert_unpack("P", "P;2", b'\xe4', 3, 2, 1, 0)
        # erroneous?
        # self.assert_unpack("P", "P;2L", b'\xe4', 1, 1, 1, 0)
        self.assert_unpack("P", "P;4", b'\x02\xef', 0, 2, 14, 15)
        # erroneous?
        # self.assert_unpack("P", "P;4L", b'\x02\xef', 2, 10, 10, 0)
        self.assert_unpack("P", "P", 1, 1, 2, 3, 4)
        self.assert_unpack("P", "P;R", 1, 128, 64, 192, 32)

    def test_PA(self):
        self.assert_unpack("PA", "PA", 2, (1, 2), (3, 4), (5, 6))
        self.assert_unpack("PA", "PA;L", 2, (1, 4), (2, 5), (3, 6))

    def test_RGB(self):
        self.assert_unpack("RGB", "RGB", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
        self.assert_unpack("RGB", "RGB;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
        self.assert_unpack("RGB", "RGB;R", 3, (128, 64, 192), (32, 160, 96))
        self.assert_unpack("RGB", "RGB;16L", 6, (2, 4, 6), (8, 10, 12))
        self.assert_unpack("RGB", "RGB;16B", 6, (1, 3, 5), (7, 9, 11))
        self.assert_unpack("RGB", "BGR", 3, (3, 2, 1), (6, 5, 4), (9, 8, 7))
        self.assert_unpack("RGB", "RGB;15", 2, (8, 131, 0), (24, 0, 8))
        self.assert_unpack("RGB", "BGR;15", 2, (0, 131, 8), (8, 0, 24))
        self.assert_unpack("RGB", "RGB;16", 2, (8, 64, 0), (24, 129, 0))
        self.assert_unpack("RGB", "BGR;16", 2, (0, 64, 8), (0, 129, 24))
        self.assert_unpack("RGB", "RGB;4B", 2, (17, 0, 34), (51, 0, 68))
        self.assert_unpack("RGB", "RGBX", 4, (1, 2, 3), (5, 6, 7), (9, 10, 11))
        self.assert_unpack("RGB", "RGBX;L", 4, (1, 4, 7), (2, 5, 8), (3, 6, 9))
        self.assert_unpack("RGB", "BGRX", 4, (3, 2, 1), (7, 6, 5), (11, 10, 9))
        self.assert_unpack(
            "RGB", "XRGB", 4, (2, 3, 4), (6, 7, 8), (10, 11, 12))
        self.assert_unpack(
            "RGB", "XBGR", 4, (4, 3, 2), (8, 7, 6), (12, 11, 10))
        self.assert_unpack(
            "RGB", "YCC;P",
            b'D]\x9c\x82\x1a\x91\xfaOC\xe7J\x12',  # random data
            (127, 102, 0), (192, 227, 0), (213, 255, 170), (98, 255, 133))
        self.assert_unpack("RGB", "R", 1, (1, 0, 0), (2, 0, 0), (3, 0, 0))
        self.assert_unpack("RGB", "G", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
        self.assert_unpack("RGB", "B", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))

    def test_RGBA(self):
        self.assert_unpack(
            "RGBA", "LA", 2, (1, 1, 1, 2), (3, 3, 3, 4), (5, 5, 5, 6))
        self.assert_unpack(
            "RGBA", "LA;16B", 4, (1, 1, 1, 3), (5, 5, 5, 7), (9, 9, 9, 11))
        self.assert_unpack(
            "RGBA", "RGBA", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_unpack(
            "RGBA", "RGBAX", 5, (1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14))
        self.assert_unpack(
            "RGBA", "RGBAXX", 6, (1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16))
        self.assert_unpack(
            "RGBA", "RGBa", 4,
            (63, 127, 191, 4), (159, 191, 223, 8), (191, 212, 233, 12))
        self.assert_unpack(
            "RGBA", "RGBa",
            b'\x01\x02\x03\x00\x10\x20\x30\x7f\x10\x20\x30\xff',
            (0, 0, 0, 0), (32, 64, 96, 127), (16, 32, 48, 255))
        self.assert_unpack(
            "RGBA", "RGBaX",
            b'\x01\x02\x03\x00-\x10\x20\x30\x7f-\x10\x20\x30\xff-',
            (0, 0, 0, 0), (32, 64, 96, 127), (16, 32, 48, 255))
        self.assert_unpack(
            "RGBA", "RGBaXX",
            b'\x01\x02\x03\x00==\x10\x20\x30\x7f!!\x10\x20\x30\xff??',
            (0, 0, 0, 0), (32, 64, 96, 127), (16, 32, 48, 255))
        self.assert_unpack(
            "RGBA", "RGBa;16L", 8,
            (63, 127, 191, 8), (159, 191, 223, 16), (191, 212, 233, 24))
        self.assert_unpack(
            "RGBA", "RGBa;16L",
            b'\x88\x01\x88\x02\x88\x03\x88\x00'
            b'\x88\x10\x88\x20\x88\x30\x88\xff',
            (0, 0, 0, 0), (16, 32, 48, 255))
        self.assert_unpack(
            "RGBA", "RGBa;16B", 8,
            (36, 109, 182, 7), (153, 187, 221, 15), (188, 210, 232, 23))
        self.assert_unpack(
            "RGBA", "RGBa;16B",
            b'\x01\x88\x02\x88\x03\x88\x00\x88'
            b'\x10\x88\x20\x88\x30\x88\xff\x88',
            (0, 0, 0, 0), (16, 32, 48, 255))
        self.assert_unpack(
            "RGBA", "BGRa", 4,
            (191, 127, 63, 4), (223, 191, 159, 8), (233, 212, 191, 12))
        self.assert_unpack(
            "RGBA", "BGRa",
            b'\x01\x02\x03\x00\x10\x20\x30\xff',
            (0, 0, 0, 0), (48, 32, 16, 255))
        self.assert_unpack(
            "RGBA", "RGBA;I", 4,
            (254, 253, 252, 4), (250, 249, 248, 8), (246, 245, 244, 12))
        self.assert_unpack(
            "RGBA", "RGBA;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12))
        self.assert_unpack("RGBA", "RGBA;15", 2, (8, 131, 0, 0), (24, 0, 8, 0))
        self.assert_unpack("RGBA", "BGRA;15", 2, (0, 131, 8, 0), (8, 0, 24, 0))
        self.assert_unpack(
            "RGBA", "RGBA;4B", 2, (17, 0, 34, 0), (51, 0, 68, 0))
        self.assert_unpack(
            "RGBA", "RGBA;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))
        self.assert_unpack(
            "RGBA", "RGBA;16B", 8, (1, 3, 5, 7), (9, 11, 13, 15))
        self.assert_unpack(
            "RGBA", "BGRA", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12))
        self.assert_unpack(
            "RGBA", "ARGB", 4, (2, 3, 4, 1), (6, 7, 8, 5), (10, 11, 12, 9))
        self.assert_unpack(
            "RGBA", "ABGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9))
        self.assert_unpack(
            "RGBA", "YCCA;P",
            b']bE\x04\xdd\xbej\xed57T\xce\xac\xce:\x11',  # random data
            (0, 161, 0, 4), (255, 255, 255, 237),
            (27, 158, 0, 206), (0, 118, 0, 17))
        self.assert_unpack(
            "RGBA", "R", 1, (1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0))
        self.assert_unpack(
            "RGBA", "G", 1, (0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0))
        self.assert_unpack(
            "RGBA", "B", 1, (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
        self.assert_unpack(
            "RGBA", "A", 1, (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))

    def test_RGBa(self):
        self.assert_unpack(
            "RGBa", "RGBa", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_unpack(
            "RGBa", "BGRa", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12))
        self.assert_unpack(
            "RGBa", "aRGB", 4, (2, 3, 4, 1), (6, 7, 8, 5), (10, 11, 12, 9))
        self.assert_unpack(
            "RGBa", "aBGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9))

    def test_RGBX(self):
        self.assert_unpack("RGBX", "RGB", 3,
                           (1, 2, 3, X), (4, 5, 6, X), (7, 8, 9, X))
        self.assert_unpack("RGBX", "RGB;L", 3,
                           (1, 4, 7, X), (2, 5, 8, X), (3, 6, 9, X))
        self.assert_unpack("RGBX", "RGB;16B", 6, (1, 3, 5, X), (7, 9, 11, X))
        self.assert_unpack("RGBX", "BGR", 3,
                           (3, 2, 1, X), (6, 5, 4, X), (9, 8, 7, X))
        self.assert_unpack("RGBX", "RGB;15", 2, (8, 131, 0, X), (24, 0, 8, X))
        self.assert_unpack("RGBX", "BGR;15", 2, (0, 131, 8, X), (8, 0, 24, X))
        self.assert_unpack("RGBX", "RGB;4B", 2, (17, 0, 34, X), (51, 0, 68, X))
        self.assert_unpack(
            "RGBX", "RGBX", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_unpack(
            "RGBX", "RGBXX", 5, (1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14))
        self.assert_unpack(
            "RGBX", "RGBXXX", 6, (1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16))
        self.assert_unpack(
            "RGBX", "RGBX;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12))
        self.assert_unpack("RGBX", "RGBX;16L", 8,
                           (2, 4, 6, 8), (10, 12, 14, 16))
        self.assert_unpack("RGBX", "RGBX;16B", 8,
                           (1, 3, 5, 7), (9, 11, 13, 15))
        self.assert_unpack("RGBX", "BGRX", 4,
                           (3, 2, 1, X), (7, 6, 5, X), (11, 10, 9, X))
        self.assert_unpack("RGBX", "XRGB", 4,
                           (2, 3, 4, X), (6, 7, 8, X), (10, 11, 12, X))
        self.assert_unpack("RGBX", "XBGR", 4,
                           (4, 3, 2, X), (8, 7, 6, X), (12, 11, 10, X))
        self.assert_unpack(
            "RGBX", "YCC;P",
            b'D]\x9c\x82\x1a\x91\xfaOC\xe7J\x12',  # random data
            (127, 102, 0, X), (192, 227, 0, X),
            (213, 255, 170, X), (98, 255, 133, X))
        self.assert_unpack("RGBX", "R", 1,
                           (1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0))
        self.assert_unpack("RGBX", "G", 1,
                           (0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0))
        self.assert_unpack("RGBX", "B", 1,
                           (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
        self.assert_unpack("RGBX", "X", 1,
                           (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))

    def test_CMYK(self):
        self.assert_unpack(
            "CMYK", "CMYK", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
        self.assert_unpack(
            "CMYK", "CMYKX", 5, (1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14))
        self.assert_unpack(
            "CMYK", "CMYKXX", 6, (1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16))
        self.assert_unpack(
            "CMYK", "CMYK;I", 4,
            (254, 253, 252, 251), (250, 249, 248, 247), (246, 245, 244, 243))
        self.assert_unpack(
            "CMYK", "CMYK;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12))
        self.assert_unpack("CMYK", "C", 1,
                           (1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0))
        self.assert_unpack("CMYK", "M", 1,
                           (0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0))
        self.assert_unpack("CMYK", "Y", 1,
                           (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
        self.assert_unpack("CMYK", "K", 1,
                           (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))
        self.assert_unpack(
            "CMYK", "C;I", 1, (254, 0, 0, 0), (253, 0, 0, 0), (252, 0, 0, 0))
        self.assert_unpack(
            "CMYK", "M;I", 1, (0, 254, 0, 0), (0, 253, 0, 0), (0, 252, 0, 0))
        self.assert_unpack(
            "CMYK", "Y;I", 1, (0, 0, 254, 0), (0, 0, 253, 0), (0, 0, 252, 0))
        self.assert_unpack(
            "CMYK", "K;I", 1, (0, 0, 0, 254), (0, 0, 0, 253), (0, 0, 0, 252))

    def test_YCbCr(self):
        self.assert_unpack(
            "YCbCr", "YCbCr", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
        self.assert_unpack(
            "YCbCr", "YCbCr;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
        self.assert_unpack(
            "YCbCr", "YCbCrK", 4, (1, 2, 3), (5, 6, 7), (9, 10, 11))
        self.assert_unpack(
            "YCbCr", "YCbCrX", 4, (1, 2, 3), (5, 6, 7), (9, 10, 11))

    def test_LAB(self):
        self.assert_unpack(
            "LAB", "LAB", 3, (1, 130, 131), (4, 133, 134), (7, 136, 137))
        self.assert_unpack("LAB", "L", 1, (1, 0, 0), (2, 0, 0), (3, 0, 0))
        self.assert_unpack("LAB", "A", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
        self.assert_unpack("LAB", "B", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))

    def test_HSV(self):
        self.assert_unpack("HSV", "HSV", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
        self.assert_unpack("HSV", "H", 1, (1, 0, 0), (2, 0, 0), (3, 0, 0))
        self.assert_unpack("HSV", "S", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
        self.assert_unpack("HSV", "V", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))

    def test_I(self):
        self.assert_unpack("I", "I;8", 1, 0x01, 0x02, 0x03, 0x04)
        self.assert_unpack("I", "I;8S", b'\x01\x83', 1, -125)
        self.assert_unpack("I", "I;16", 2, 0x0201, 0x0403)
        self.assert_unpack("I", "I;16S", b'\x83\x01\x01\x83', 0x0183, -31999)
        self.assert_unpack("I", "I;16B", 2, 0x0102, 0x0304)
        self.assert_unpack("I", "I;16BS", b'\x83\x01\x01\x83', -31999, 0x0183)
        self.assert_unpack("I", "I;32", 4, 0x04030201, 0x08070605)
        self.assert_unpack(
            "I", "I;32S",
            b'\x83\x00\x00\x01\x01\x00\x00\x83', 0x01000083, -2097151999)
        self.assert_unpack("I", "I;32B", 4, 0x01020304, 0x05060708)
        self.assert_unpack(
            "I", "I;32BS",
            b'\x83\x00\x00\x01\x01\x00\x00\x83', -2097151999, 0x01000083)

        if sys.byteorder == 'little':
            self.assert_unpack("I", "I", 4, 0x04030201, 0x08070605)
            self.assert_unpack("I", "I;16N", 2, 0x0201, 0x0403)
            self.assert_unpack("I", "I;16NS",
                               b'\x83\x01\x01\x83', 0x0183, -31999)
            self.assert_unpack("I", "I;32N", 4, 0x04030201, 0x08070605)
            self.assert_unpack(
                "I", "I;32NS",
                b'\x83\x00\x00\x01\x01\x00\x00\x83', 0x01000083, -2097151999)
        else:
            self.assert_unpack("I", "I", 4, 0x01020304, 0x05060708)
            self.assert_unpack("I", "I;16N", 2, 0x0102, 0x0304)
            self.assert_unpack("I", "I;16NS",
                               b'\x83\x01\x01\x83', -31999, 0x0183)
            self.assert_unpack("I", "I;32N", 4, 0x01020304, 0x05060708)
            self.assert_unpack(
                "I", "I;32NS",
                b'\x83\x00\x00\x01\x01\x00\x00\x83', -2097151999, 0x01000083)

    def test_F_int(self):
        self.assert_unpack("F", "F;8", 1, 0x01, 0x02, 0x03, 0x04)
        self.assert_unpack("F", "F;8S", b'\x01\x83', 1, -125)
        self.assert_unpack("F", "F;16", 2, 0x0201, 0x0403)
        self.assert_unpack("F", "F;16S", b'\x83\x01\x01\x83', 0x0183, -31999)
        self.assert_unpack("F", "F;16B", 2, 0x0102, 0x0304)
        self.assert_unpack("F", "F;16BS", b'\x83\x01\x01\x83', -31999, 0x0183)
        self.assert_unpack("F", "F;32", 4, 67305984, 134678016)
        self.assert_unpack(
            "F", "F;32S",
            b'\x83\x00\x00\x01\x01\x00\x00\x83', 16777348, -2097152000)
        self.assert_unpack("F", "F;32B", 4, 0x01020304, 0x05060708)
        self.assert_unpack(
            "F", "F;32BS",
            b'\x83\x00\x00\x01\x01\x00\x00\x83', -2097152000, 16777348)

        if sys.byteorder == 'little':
            self.assert_unpack("F", "F;16N", 2, 0x0201, 0x0403)
            self.assert_unpack(
                "F", "F;16NS",
                b'\x83\x01\x01\x83', 0x0183, -31999)
            self.assert_unpack("F", "F;32N", 4, 67305984, 134678016)
            self.assert_unpack(
                "F", "F;32NS",
                b'\x83\x00\x00\x01\x01\x00\x00\x83', 16777348, -2097152000)
        else:
            self.assert_unpack("F", "F;16N", 2, 0x0102, 0x0304)
            self.assert_unpack(
                "F", "F;16NS",
                b'\x83\x01\x01\x83', -31999, 0x0183)
            self.assert_unpack("F", "F;32N", 4, 0x01020304, 0x05060708)
            self.assert_unpack(
                "F", "F;32NS",
                b'\x83\x00\x00\x01\x01\x00\x00\x83',
                -2097152000, 16777348)

    def test_F_float(self):
        self.assert_unpack(
            "F", "F;32F", 4,
            1.539989614439558e-36, 4.063216068939723e-34)
        self.assert_unpack(
            "F", "F;32BF", 4,
            2.387939260590663e-38, 6.301941157072183e-36)
        self.assert_unpack(
            "F", "F;64F",
            b'333333\xc3?\x00\x00\x00\x00\x00J\x93\xc0',  # by struct.pack
            0.15000000596046448, -1234.5)
        self.assert_unpack(
            "F", "F;64BF",
            b'?\xc3333333\xc0\x93J\x00\x00\x00\x00\x00',  # by struct.pack
            0.15000000596046448, -1234.5)

        if sys.byteorder == 'little':
            self.assert_unpack(
                "F", "F", 4,
                1.539989614439558e-36, 4.063216068939723e-34)
            self.assert_unpack(
                "F", "F;32NF", 4,
                1.539989614439558e-36, 4.063216068939723e-34)
            self.assert_unpack(
                "F", "F;64NF",
                b'333333\xc3?\x00\x00\x00\x00\x00J\x93\xc0',
                0.15000000596046448, -1234.5)
        else:
            self.assert_unpack(
                "F", "F", 4,
                2.387939260590663e-38, 6.301941157072183e-36)
            self.assert_unpack(
                "F", "F;32NF", 4,
                2.387939260590663e-38, 6.301941157072183e-36)
            self.assert_unpack(
                "F", "F;64NF",
                b'?\xc3333333\xc0\x93J\x00\x00\x00\x00\x00',
                0.15000000596046448, -1234.5)

    def test_I16(self):
        self.assert_unpack("I;16", "I;16", 2, 0x0201, 0x0403, 0x0605)
        self.assert_unpack("I;16B", "I;16B", 2, 0x0102, 0x0304, 0x0506)
        self.assert_unpack("I;16L", "I;16L", 2, 0x0201, 0x0403, 0x0605)
        self.assert_unpack("I;16", "I;12", 2, 0x0010, 0x0203, 0x0040)
        if sys.byteorder == 'little':
            self.assert_unpack("I;16", "I;16N", 2, 0x0201, 0x0403, 0x0605)
            self.assert_unpack("I;16B", "I;16N", 2, 0x0201, 0x0403, 0x0605)
            self.assert_unpack("I;16L", "I;16N", 2, 0x0201, 0x0403, 0x0605)
        else:
            self.assert_unpack("I;16", "I;16N", 2, 0x0102, 0x0304, 0x0506)
            self.assert_unpack("I;16B", "I;16N", 2, 0x0102, 0x0304, 0x0506)
            self.assert_unpack("I;16L", "I;16N", 2, 0x0102, 0x0304, 0x0506)

    def test_value_error(self):
        self.assertRaises(ValueError, self.assert_unpack, "L", "L", 0, 0)
        self.assertRaises(ValueError, self.assert_unpack, "RGB", "RGB", 2, 0)
        self.assertRaises(ValueError, self.assert_unpack, "CMYK", "CMYK", 2, 0)