commit b25d5fcdcf4723ca3da8bc69ecc6c52010778f7c
author Mark Adler <zlib@madler.net> Thu Oct 12 19:34:51 2017 -0700
committer Mark Adler <zlib@madler.net> Thu Oct 12 19:35:59 2017 -0700
tree 96ee239a6cf0c96a4332d53ab99517d6b8ec5d5f
parent ae49d1472ec176ddc53a3a4905f91d46344386e6

Avoid undefined behaviors of memcpy() in gz*printf().

gzwrite.c

diff --git a/gzwrite.c b/gzwrite.c
index 3560193..26e89b6 100644
--- a/gzwrite.c
+++ b/gzwrite.c
@@ -444,7 +444,7 @@
         strm->avail_in = state->size;
         if (gz_comp(state, Z_NO_FLUSH) == -1)
             return state->err;
-        memcpy(state->in, state->in + state->size, left);
+        memmove(state->in, state->in + state->size, left);
         strm->next_in = state->in;
         strm->avail_in = left;
     }
@@ -543,7 +543,7 @@
         strm->avail_in = state->size;
         if (gz_comp(state, Z_NO_FLUSH) == -1)
             return state->err;
-        memcpy(state->in, state->in + state->size, left);
+        memmove(state->in, state->in + state->size, left);
         strm->next_in = state->in;
         strm->avail_in = left;
     }