lib/zstd
1
0
Fork 0
mirror of https://github.com/facebook/zstd.git synced 2025-07-29 11:21:22 +03:00
Code Activity

Merge pull request #4013 from elasota/spec-clarify-offset-code-overflow

Browse Source 
Specify that decoders may reject non-zero probabilities for larger offset codes than implementation supports
This commit is contained in:
Yann Collet
2024-09-27 13:42:32 -07:00
committed by GitHub
parent 9215de52c7 c54f4783d0
commit d2212c680a
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
doc/zstd_compression_format.md
View File

@ -1127,7 +1127,10 @@ When last symbol reaches cumulated total of `1 << Accuracy_Log`,
decoding is complete.
If this process results in a non-zero probability for a value outside of the
valid range of values that the FSE table is defined for, even if that value is
not used, then the data is considered corrupted.
not used, then the data is considered corrupted. In the case of offset codes,
a decoder implementation may reject a frame containing a non-zero probability
for an offset code larger than the largest offset code supported by the decoder
implementation.
Then the decoder can tell how many bytes were used in this process,
and how many symbols are present.