commit c5ee34c28a9144b1b5a5021d05ed29940c53010c
author Mark Adler <madler@alumni.caltech.edu> Sat Dec 03 08:29:57 2016 -0800
committer Mark Adler <madler@alumni.caltech.edu> Sun Dec 04 07:48:47 2016 -0800
tree 2b524d836c87f3693a60fd5a33a361d04f1f66f1
parent 123f9cfaf7730dcc52c380eaf04c15dc3e0b15f8

Don't need to emit an empty fixed block when changing parameters.

gzsetparams() was using Z_PARTIAL_FLUSH when it could use Z_BLOCK
instead. This commit uses Z_BLOCK, which avoids emitting an
unnecessary ten bits into the stream.

gzwrite.c

diff --git a/gzwrite.c b/gzwrite.c
index 2905cce..61a4de7 100644
--- a/gzwrite.c
+++ b/gzwrite.c
@@ -554,7 +554,7 @@
     /* change compression parameters for subsequent input */
     if (state->size) {
         /* flush previous input with previous parameters before changing */
-        if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
+        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
             return state->err;
         deflateParams(strm, level, strategy);
     }