Improve the discrimination between trailing garbage and bad gzip.

This proceeds to try to decode whatever follows the last gzip
member, and concludes that it is acceptable trailing garbage only
if it results in a data error without decompressing any data. This
commit also reduces the probability of a false-positive gzip header
detection.

1 files changed, 1 insertions, 0 deletions

diff --git a/gzlib.c b/gzlib.c
index 4c1aa83a..79a7e978 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -72,6 +72,7 @@ local void gz_reset(gz_statep state) {
         state->eof = 0;             /* not at end of file */
         state->past = 0;            /* have not read past end yet */
         state->how = LOOK;          /* look for gzip header */
+        state->junk = -1;           /* mark first member */
     }
     else                            /* for writing ... */
         state->reset = 0;           /* no deflateReset pending */