bodgit / sevenzip / 37503357966

78%

push

github

fix: reject substream sizes larger than their folder (#503)

The size of the last stream in a folder is whatever remains after
subtracting the other declared sizes from the folder's unpack size.
If the declared sizes exceeded the folder size, the subtraction
underflowed, giving the last file a huge size that FileInfo().Size()
reported as negative. The running total could also overflow and wrap
round to a small value, yielding plausible but wrong sizes.

As 7-Zip does, return an error if the total overflows or exceeds the
folder size. Move the per-folder size reading into
readSubStreamSizes, which keeps readSubStreamsInfo within the nesting
limit.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

19 of 23 new or added lines in 1 file covered. (82.61%)

2033 of 2618 relevant lines covered (77.65%)

0.88 hits per line