patch from upstream for determinism issue

[debian/gzip] / debian / patches / determinism.diff

diff --git a/debian/patches/determinism.diff b/debian/patches/determinism.diff
new file mode 100644 (file)
index 0000000..7cd881b
--- /dev/null
+++ b/debian/patches/determinism.diff
@@ -0,0 +1,23 @@
+From 0a284baeaedca68017f46d2646e4c921aa98a90d Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Sun, 18 Mar 2012 18:07:02 +0000
+Subject: gzip: fix nondeterministic compression results
+
+Reported by Jakub Wilk in <http://bugs.debian.org/647522>.
+* deflate.c (fill_window): Don't let garbage pollute the dictionary.
+---
+diff --git a/deflate.c b/deflate.c
+index 6c19552..5405f10 100644
+--- a/deflate.c
++++ b/deflate.c
+@@ -571,6 +571,8 @@ local void fill_window()
+         n = read_buf((char*)window+strstart+lookahead, more);
+         if (n == 0 || n == (unsigned)EOF) {
+             eofile = 1;
++            /* Don't let garbage pollute the dictionary.  */
++            memzero (window + strstart + lookahead, MIN_MATCH - 1);
+         } else {
+             lookahead += n;
+         }
+--
+cgit v0.9.0.2