Improve speed of gzprintf() in transparent mode.

2015-07-05 18:14:53 -07:00
parent 8a979f6c79
commit 95698093f0
4 changed files with 70 additions and 51 deletions
--- a/gzlib.c
+++ b/gzlib.c
@@ -331,6 +331,8 @@ int ZEXPORT gzbuffer(file, size)
        return -1;

    /* check and set requested size */
+    if ((size << 1) < size)
+        return -1;              /* need to be able to double it */
    if (size < 2)
        size = 2;               /* need two bytes to check magic header */
    state->want = size;