don't compress too small files (fixes #1241)

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@1918 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -7,6 +7,7 @@ NEWS
   * added dir-listing.set-footer in mod_dirlisting (#1277)
   * fixed hardcoded font-sizes in mod_dirlisting (#1267)
   * fixed different ETag length on 32/64 platforms (#1279)
+  * fixed compression of files < 128 bytes by disabling compression (#1241)
 
 - 1.4.16 - 
 

src/mod_compress.c

@@ -589,6 +589,13 @@ PHYSICALPATH_FUNC(mod_compress_physical) {
 	/* don't compress files that are too large as we need to much time to handle them */
 	if (max_fsize && (sce->st.st_size >> 10) > max_fsize) return HANDLER_GO_ON;
 
+	/* don't try to compress files less than 128 bytes
+	 *
+	 * - extra overhead for compression
+	 * - mmap() fails for st_size = 0 :)
+	 */
+	if (sce->st.st_size < 128) return HANDLER_GO_ON;
+
 	/* check if mimetype is in compress-config */
 	for (m = 0; m < p->conf.compress->used; m++) {
 		data_string *compress_ds = (data_string *)p->conf.compress->data[m];