test_lib_pack.py

from __future__ import annotations

import sys

import pytest

from PIL import Image

X = 255


class TestLibPack:
    def assert_pack(
        self,
        mode: str,
        rawmode: str,
        data: int | bytes,
        *pixels: float | tuple[int, ...],
    ) -> None:
        """
        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(range(1, data_len + 1))

        assert data == im.tobytes("raw", rawmode)

    def test_1(self) -> None:
        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) -> None:
        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) -> None:
        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_La(self) -> None:
        self.assert_pack("La", "La", 2, (1, 2), (3, 4), (5, 6))

    def test_P(self) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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_I16(self) -> None:
        self.assert_pack("I;16N", "I;16N", 2, 0x0201, 0x0403, 0x0605)

    def test_F_float(self) -> None:
        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:
    def assert_unpack(
        self,
        mode: str,
        rawmode: str,
        data: int | bytes,
        *pixels: float | tuple[int, ...],
    ) -> None:
        """
        data - either raw bytes with data or just number of bytes in rawmode.
        """
        if isinstance(data, int):
            data_len = data * len(pixels)
            data = bytes(range(1, data_len + 1))

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

        for x, pixel in enumerate(pixels):
            assert pixel == im.getpixel((x, 0))

    def test_1(self) -> None:
        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) -> None:
        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) -> None:
        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_La(self) -> None:
        self.assert_unpack("La", "La", 2, (1, 2), (3, 4), (5, 6))

    def test_P(self) -> None:
        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) -> None:
        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) -> None:
        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))

        self.assert_unpack("RGB", "R;16B", 2, (1, 0, 0), (3, 0, 0), (5, 0, 0))
        self.assert_unpack("RGB", "G;16B", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
        self.assert_unpack("RGB", "B;16B", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))

        self.assert_unpack("RGB", "R;16L", 2, (2, 0, 0), (4, 0, 0), (6, 0, 0))
        self.assert_unpack("RGB", "G;16L", 2, (0, 2, 0), (0, 4, 0), (0, 6, 0))
        self.assert_unpack("RGB", "B;16L", 2, (0, 0, 2), (0, 0, 4), (0, 0, 6))

        if sys.byteorder == "little":
            self.assert_unpack("RGB", "R;16N", 2, (2, 0, 0), (4, 0, 0), (6, 0, 0))
            self.assert_unpack("RGB", "G;16N", 2, (0, 2, 0), (0, 4, 0), (0, 6, 0))
            self.assert_unpack("RGB", "B;16N", 2, (0, 0, 2), (0, 0, 4), (0, 0, 6))
        else:
            self.assert_unpack("RGB", "R;16N", 2, (1, 0, 0), (3, 0, 0), (5, 0, 0))
            self.assert_unpack("RGB", "G;16N", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
            self.assert_unpack("RGB", "B;16N", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))

        self.assert_unpack(
            "RGB", "CMYK", 4, (250, 249, 248), (242, 241, 240), (234, 233, 233)
        )

    def test_BGR(self) -> None:
        self.assert_unpack("BGR;15", "BGR;15", 3, (0, 16, 1), (1, 0, 3), (1, 16, 5))
        self.assert_unpack("BGR;16", "BGR;16", 3, (0, 16, 1), (0, 32, 3), (0, 48, 5))
        self.assert_unpack("BGR;24", "BGR;24", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))

    def test_RGBA(self) -> None:
        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\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\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;16L", 8, (6, 4, 2, 8), (14, 12, 10, 16))
        self.assert_unpack("RGBA", "BGRA;16B", 8, (5, 3, 1, 7), (13, 11, 9, 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))

        self.assert_unpack("RGBA", "R;16B", 2, (1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0))
        self.assert_unpack("RGBA", "G;16B", 2, (0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0))
        self.assert_unpack("RGBA", "B;16B", 2, (0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0))
        self.assert_unpack("RGBA", "A;16B", 2, (0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5))

        self.assert_unpack("RGBA", "R;16L", 2, (2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0))
        self.assert_unpack("RGBA", "G;16L", 2, (0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0))
        self.assert_unpack("RGBA", "B;16L", 2, (0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0))
        self.assert_unpack("RGBA", "A;16L", 2, (0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6))

        if sys.byteorder == "little":
            self.assert_unpack(
                "RGBA", "R;16N", 2, (2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0)
            )
            self.assert_unpack(
                "RGBA", "G;16N", 2, (0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0)
            )
            self.assert_unpack(
                "RGBA", "B;16N", 2, (0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0)
            )
            self.assert_unpack(
                "RGBA", "A;16N", 2, (0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6)
            )
        else:
            self.assert_unpack(
                "RGBA", "R;16N", 2, (1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0)
            )
            self.assert_unpack(
                "RGBA", "G;16N", 2, (0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0)
            )
            self.assert_unpack(
                "RGBA", "B;16N", 2, (0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0)
            )
            self.assert_unpack(
                "RGBA", "A;16N", 2, (0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5)
            )

    def test_RGBa(self) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        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) -> None:
        self.assert_unpack("I;16", "I;16", 2, 0x0201, 0x0403, 0x0605)
        self.assert_unpack("I;16", "I;16B", 2, 0x0102, 0x0304, 0x0506)
        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)
            self.assert_unpack("I;16N", "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)
            self.assert_unpack("I;16N", "I;16N", 2, 0x0102, 0x0304, 0x0506)

    def test_CMYK16(self) -> None:
        self.assert_unpack("CMYK", "CMYK;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))
        self.assert_unpack("CMYK", "CMYK;16B", 8, (1, 3, 5, 7), (9, 11, 13, 15))
        if sys.byteorder == "little":
            self.assert_unpack("CMYK", "CMYK;16N", 8, (2, 4, 6, 8), (10, 12, 14, 16))
        else:
            self.assert_unpack("CMYK", "CMYK;16N", 8, (1, 3, 5, 7), (9, 11, 13, 15))

    def test_value_error(self) -> None:
        with pytest.raises(ValueError):
            self.assert_unpack("L", "L", 0, 0)
        with pytest.raises(ValueError):
            self.assert_unpack("RGB", "RGB", 2, 0)
        with pytest.raises(ValueError):
            self.assert_unpack("CMYK", "CMYK", 2, 0)