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Test unsupported BMP bitfields layout

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This commit is contained in:
Andrew Murray 2025-09-05 23:43:47 +10:00
parent ba04d58851
commit 2bf482230d
1 changed files with 15 additions and 1 deletions
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16
Tests/test_file_bmp.py
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@ -6,6 +6,8 @@ from pathlib import Path
import pytest import pytest
from PIL import BmpImagePlugin, Image, _binary from PIL import BmpImagePlugin, Image, _binary
from PIL._binary import o16le as o16
from PIL._binary import o32le as o32
from .helper import ( from .helper import (
assert_image_equal, assert_image_equal,
@ -114,7 +116,7 @@ def test_save_float_dpi(tmp_path: Path) -> None:
def test_load_dib() -> None: def test_load_dib() -> None:
# test for #1293, Imagegrab returning Unsupported Bitfields Format # test for #1293, ImageGrab returning Unsupported Bitfields Format
with Image.open("Tests/images/clipboard.dib") as im: with Image.open("Tests/images/clipboard.dib") as im:
assert im.format == "DIB" assert im.format == "DIB"
assert im.get_format_mimetype() == "image/bmp" assert im.get_format_mimetype() == "image/bmp"
@ -219,6 +221,18 @@ def test_rle8_eof(file_name: str, length: int) -> None:
im.load() im.load()
def test_unsupported_bmp_bitfields_layout() -> None:
fp = io.BytesIO(
o32(40) # header size
+ b"\x00" * 10
+ o16(1) # bits
+ o32(3) # BITFIELDS compression
+ b"\x00" * 32
)
with pytest.raises(OSError, match="Unsupported BMP bitfields layout"):
Image.open(fp)
def test_offset() -> None: def test_offset() -> None:
# This image has been hexedited # This image has been hexedited
# to exclude the palette size from the pixel data offset # to exclude the palette size from the pixel data offset