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65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
from __future__ import annotations
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import zlib
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from io import BytesIO
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import pytest
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from PIL import Image, ImageFile, PngImagePlugin
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TEST_FILE = "Tests/images/png_decompression_dos.png"
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def test_ignore_dos_text(monkeypatch: pytest.MonkeyPatch) -> None:
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monkeypatch.setattr(ImageFile, "LOAD_TRUNCATED_IMAGES", True)
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with Image.open(TEST_FILE) as im:
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im.load()
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assert isinstance(im, PngImagePlugin.PngImageFile)
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for s in im.text.values():
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assert len(s) < 1024 * 1024, "Text chunk larger than 1M"
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for s in im.info.values():
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assert len(s) < 1024 * 1024, "Text chunk larger than 1M"
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def test_dos_text() -> None:
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try:
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im = Image.open(TEST_FILE)
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im.load()
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except ValueError as msg:
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assert msg, "Decompressed Data Too Large"
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return
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assert isinstance(im, PngImagePlugin.PngImageFile)
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for s in im.text.values():
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assert len(s) < 1024 * 1024, "Text chunk larger than 1M"
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def test_dos_total_memory() -> None:
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im = Image.new("L", (1, 1))
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compressed_data = zlib.compress(b"a" * 1024 * 1023)
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info = PngImagePlugin.PngInfo()
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for x in range(64):
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info.add_text(f"t{x}", compressed_data, zip=True)
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info.add_itxt(f"i{x}", compressed_data, zip=True)
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b = BytesIO()
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im.save(b, "PNG", pnginfo=info)
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b.seek(0)
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try:
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im2 = Image.open(b)
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except ValueError as msg:
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assert "Too much memory" in str(msg)
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return
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total_len = 0
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assert isinstance(im2, PngImagePlugin.PngImageFile)
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for txt in im2.text.values():
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total_len += len(txt)
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assert total_len < 64 * 1024 * 1024, "Total text chunks greater than 64M"
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