diff options
Diffstat (limited to 'deflate_medium.c')
| -rw-r--r-- | deflate_medium.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/deflate_medium.c b/deflate_medium.c index dad550c..59ccfa8 100644 --- a/deflate_medium.c +++ b/deflate_medium.c @@ -210,7 +210,7 @@ Z_INTERNAL block_state deflate_medium(deflate_state *s, int flush) { */ dist = (int64_t)s->strstart - hash_head; - if (dist <= MAX_DIST(s) && dist > 0) { + if (dist <= MAX_DIST(s) && dist > 0 && hash_head != 0) { /* To simplify the code, we prevent matches with the string * of window index 0 (in particular we have to avoid a match * of the string with itself at the start of the input file). @@ -245,7 +245,7 @@ Z_INTERNAL block_state deflate_medium(deflate_state *s, int flush) { */ dist = (int64_t)s->strstart - hash_head; - if (dist <= MAX_DIST(s) && dist > 0) { + if (dist <= MAX_DIST(s) && dist > 0 && hash_head != 0) { /* To simplify the code, we prevent matches with the string * of window index 0 (in particular we have to avoid a match * of the string with itself at the start of the input file). |