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gfx: safer alternating-byte detection in compression
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@ -467,7 +467,7 @@ class Compressed:
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num_alts = 0
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# make sure we don't check for alts at the end of the file
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if self.address+2 >= self.end: return False
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if self.address+3 >= self.end: return False
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self.alts.append(self.byte)
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self.alts.append(ord(self.image[self.address+1]))
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