From 0cf495a1ca941428c0b11e2307cad760ae44993e Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Sat, 29 Sep 2012 22:23:47 -0700
Subject: [PATCH] Fix bug where gzopen(), gzclose() would write an empty file.

A gzopen() to write (mode "w") followed immediately by a gzclose()
would output an empty zero-length file.  What it should do is write
an empty gzip file, with the gzip header, empty deflate content,
and gzip trailer totalling 20 bytes.  This fixes it to do that.
---
 gzwrite.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/gzwrite.c b/gzwrite.c
index f53aace..79a69a5 100644
--- a/gzwrite.c
+++ b/gzwrite.c
@@ -554,15 +554,14 @@ int ZEXPORT gzclose_w(file)
     }
 
     /* flush, free memory, and close file */
-    if (state->size) {
-        if (gz_comp(state, Z_FINISH) == -1)
-            ret = state->err;
-        if (!state->direct) {
-            (void)deflateEnd(&(state->strm));
-            free(state->out);
-        }
-        free(state->in);
+    if (gz_comp(state, Z_FINISH) == -1)
+        ret = state->err;
+    if (!state->direct) {
+        (void)deflateEnd(&(state->strm));
+        free(state->out);
     }
+    if (state->size)
+        free(state->in);
     gz_error(state, Z_OK, NULL);
     free(state->path);
     if (close(state->fd) == -1)
-- 
1.9.3