Fixed reading FLI/FLC images with a prefix chunk #7804
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Please could you add a test that fails without the fix, and passes with it? |
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This is reproducible with this sample : https://samples.ffmpeg.org/fli-flc/2422.FLC from PIL import Image, ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True
im = Image.open("2422.FLC")
im.seek(15)
im.save('frame15.png')You get garbage without the patch and a clean image with the patch |
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Can you write a unit test, with an image that can be contributed under Pillow's licence? A unit test helps ensure this doesn't break in the future. |
radarhere
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test added |
radarhere
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hugovk
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radarhere
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radarhere
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radarhere
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radarhere
reviewed
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radarhere
reviewed
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radarhere
approved these changes
Feb 22, 2024
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Thank you! |
radarhere
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fix FLC decoder for files with prefix chunk
without the seek() the decoder continues to read bytes in the prefixchunk and have zero chance to find the 0xF1FA magic number ut needs just after