--- a/zfile.c	2017-10-19 09:58:03.047699012 +0200
+++ b/zfile.c	2017-10-19 09:59:42.073325019 +0200
@@ -284,11 +284,11 @@ zfile_read(void *cookie_, char *buf, siz
                        cookie->in);
             if (ferror(cookie->in)) {
                 warn("error read core");
-                exit(1);
+                return -1;
             }
-            if (nb == 0 && feof(cookie->in)) {
+            if (nb == 0 && !feof(cookie->in)) {
                 warn("truncated file");
-                exit(1);
+                return -1;
             }
             if (cookie->ctype == AG_XZ) {
                 cookie->stream.lzma.avail_in = nb;