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Assert JpegIFByteCount is int
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@ -191,7 +191,10 @@ class ImageFile(Image.Image):
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if thumbnail_offset is not None:
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thumbnail_offset += getattr(self, "_exif_offset", 0)
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self.fp.seek(thumbnail_offset)
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data = self.fp.read(ifd.get(ExifTags.Base.JpegIFByteCount))
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length = ifd.get(ExifTags.Base.JpegIFByteCount)
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assert isinstance(length, int)
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data = self.fp.read(length)
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fp = io.BytesIO(data)
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with Image.open(fp) as im:
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