--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/zip/libzip/lib/zip_source_call.c	Wed Jun 01 17:36:52 2016 +0200
@@ -0,0 +1,69 @@
+/*
+ zip_source_call.c -- invoke callback command on zip_source
+ Copyright (C) 2009-2014 Dieter Baron and Thomas Klausner
+ 
+ This file is part of libzip, a library to manipulate ZIP archives.
+ The authors can be contacted at <libzip@nih.at>
+ 
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ 3. The names of the authors may not be used to endorse or promote
+ products derived from this software without specific prior
+ written permission.
+ 
+ THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+ OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "zipint.h"
+
+
+zip_int64_t
+_zip_source_call(zip_source_t *src, void *data, zip_uint64_t length, zip_source_cmd_t command)
+{
+    zip_int64_t ret;
+    
+    if ((src->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(command)) == 0) {
+        zip_error_set(&src->error, ZIP_ER_OPNOTSUPP, 0);
+        return -1;
+    }
+
+    if (src->src == NULL) {
+        ret = src->cb.f(src->ud, data, length, command);
+    }
+    else {
+        ret = src->cb.l(src->src, src->ud, data, length, command);
+    }
+    
+    if (ret < 0) {
+        if (command != ZIP_SOURCE_ERROR && command != ZIP_SOURCE_SUPPORTS) {
+            int e[2];
+            
+            if (_zip_source_call(src, e, sizeof(e), ZIP_SOURCE_ERROR) < 0) {
+                zip_error_set(&src->error, ZIP_ER_INTERNAL, 0);
+            }
+            else {
+                zip_error_set(&src->error, e[0], e[1]);
+            }
+        }
+    }
+
+    return ret;
+}