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…ZMAFile Null bytes in multiples of four after an .xz stream are now skipped, so that a stream following them is decoded instead of ignored.
gpshead
added
needs backport to 3.14
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lzma.decompress()andLZMAFilenow skip .xz stream padding (a run of null bytes whose size is a multiple of four) after a stream that starts with the .xz magic, and go on to decode the stream that follows; a damaged stream after the padding raises like any other damaged later stream. The skipping is done in the shared Python stream loop and turned on only bylzma, rather than withLZMA_CONCATENATEDin C, because that would need a new finish method onLZMADecompressorand would reject the mixed .xz/.lzma data thatFORMAT_AUTOdecodes today. A run of null bytes whose size is not a multiple of four is still handed to the decompressor as before, so nothing that decodes today starts to fail on that account, although the format specification says it is an error.FORMAT_ALONE,FORMAT_RAW,bz2andcompression.zstdare unchanged.Fixes #88300