--- embedaddon/php/ext/zip/lib/zip_set_archive_flag.c	2012/02/21 23:48:05	1.1.1.1
+++ embedaddon/php/ext/zip/lib/zip_set_archive_flag.c	2013/07/22 01:32:11	1.1.1.2
@@ -40,10 +40,30 @@
 ZIP_EXTERN(int)
 zip_set_archive_flag(struct zip *za, int flag, int value)
 {
+    unsigned int new_flags;
+    
     if (value)
-	za->ch_flags |= flag;
+	new_flags = za->ch_flags | flag;
     else
-	za->ch_flags &= ~flag;
+	new_flags = za->ch_flags & ~flag;
+
+    if (new_flags == za->ch_flags)
+	return 0;
+
+    if (ZIP_IS_RDONLY(za)) {
+	_zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
+	return -1;
+    }
+
+    if ((flag & ZIP_AFL_RDONLY) && value
+	&& (za->ch_flags & ZIP_AFL_RDONLY) == 0) {
+	if (_zip_changed(za, NULL)) {
+	    _zip_error_set(&za->error, ZIP_ER_CHANGED, 0);
+	    return -1;
+	}
+    }
+
+    za->ch_flags = new_flags;
 
     return 0;
 }