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| author | Mark Adler <madler@alumni.caltech.edu> | 2022-12-15 09:07:13 -0800 |
|---|---|---|
| committer | Mark Adler <madler@alumni.caltech.edu> | 2022-12-15 09:15:31 -0800 |
| commit | e554695638228b846d49657f31eeff0ca4680e8a (patch) | |
| tree | 8f01c7ef4e8c6f599922a38700165c8537fdcdbf | |
| parent | 76820e4107f534231f1302351a7ea479e86d1dd4 (diff) | |
| download | zlib-e554695638228b846d49657f31eeff0ca4680e8a.tar.gz | |
Fix bug in deflateBound() for level 0 and memLevel 9.
memLevel 9 would cause deflateBound() to assume the use of fixed
blocks, even if the compression level was 0, which forces stored
blocks. That could result in a bound less than the size of the
compressed data. Now level 0 always uses the stored blocks bound.
| -rw-r--r-- | deflate.c | 3 |
1 files changed, 2 insertions, 1 deletions
@@ -752,7 +752,8 @@ uLong ZEXPORT deflateBound(strm, sourceLen) /* if not default parameters, return one of the conservative bounds */ if (s->w_bits != 15 || s->hash_bits != 8 + 7) - return (s->w_bits <= s->hash_bits ? fixedlen : storelen) + wraplen; + return (s->w_bits <= s->hash_bits && s->level ? fixedlen : storelen) + + wraplen; /* default settings: return tight bound for that case -- ~0.03% overhead plus a small constant */ |