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| author | Richard van der Hoff <richard@matrix.org> | 2016-05-25 15:44:39 +0100 |
|---|---|---|
| committer | Richard van der Hoff <richard@matrix.org> | 2016-05-25 15:44:39 +0100 |
| commit | fae8dacab5233c46f09e7d869afadaead2842609 (patch) | |
| tree | a36121e294d49c4e7cf85fa5dc33eaff7e41110f /src/megolm.c | |
| parent | 19a7fb5df5ec3445201ce5fbe475a08faf6319fc (diff) | |
Add a comment explaining Mark's latest fix
Diffstat (limited to 'src/megolm.c')
| -rw-r--r-- | src/megolm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/megolm.c b/src/megolm.c index affd3cb..3395449 100644 --- a/src/megolm.c +++ b/src/megolm.c @@ -116,6 +116,11 @@ void megolm_advance_to(Megolm *megolm, uint32_t advance_to) { ((advance_to >> shift) - (megolm->counter >> shift)) & 0xff; if (steps == 0) { + /* deal with the edge case where megolm->counter is slightly larger + * than advance_to. This should only happen for R(0), and implies + * that advance_to has wrapped around and we need to advance R(0) + * 256 times. + */ if (advance_to < megolm->counter) { steps = 0x100; } else { |