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[bugfix] Pad missing JPEG bytes out to expected file length #3
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This PR fixes an issue where some JPEGs (see new test case) would end up with some bytes missing during the parsing process.
This PR fixes this up by keeping track of the expected file length vs bytes written, during the segment processing, and pads before the EOI with any bytes that went missing. This results in valid, decodable images that keep the same length (as they should).