--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/zip/libzip/lib/zip_source_function.c	Wed Jun 01 17:36:52 2016 +0200
@@ -0,0 +1,99 @@
+/*
+  zip_source_function.c -- create zip data source from callback function
+  Copyright (C) 1999-2014 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 <stdlib.h>
+
+#include "zipint.h"
+
+
+ZIP_EXTERN zip_source_t *
+zip_source_function(zip_t *za, zip_source_callback zcb, void *ud)
+{
+    if (za == NULL) {
+        return NULL;
+    }
+    
+    return zip_source_function_create(zcb, ud, &za->error);
+}
+
+
+ZIP_EXTERN zip_source_t *
+zip_source_function_create(zip_source_callback zcb, void *ud, zip_error_t *error)
+{
+    zip_source_t *zs;
+
+    if ((zs=_zip_source_new(error)) == NULL)
+	return NULL;
+
+    zs->cb.f = zcb;
+    zs->ud = ud;
+    
+    zs->supports = zcb(ud, NULL, 0, ZIP_SOURCE_SUPPORTS);
+    if (zs->supports < 0) {
+        zs->supports = ZIP_SOURCE_SUPPORTS_READABLE;
+    }
+    
+    return zs;
+}
+
+
+ZIP_EXTERN void
+zip_source_keep(zip_source_t *src)
+{
+    src->refcount++;
+}
+
+
+zip_source_t *
+_zip_source_new(zip_error_t *error)
+{
+    zip_source_t *src;
+
+    if ((src=(zip_source_t *)malloc(sizeof(*src))) == NULL) {
+        zip_error_set(error, ZIP_ER_MEMORY, 0);
+	return NULL;
+    }
+
+    src->src = NULL;
+    src->cb.f = NULL;
+    src->ud = NULL;
+    src->open_count = 0;
+    src->write_state = ZIP_SOURCE_WRITE_CLOSED;
+    src->source_closed = false;
+    src->source_archive = NULL;
+    src->refcount = 1;
+    zip_error_init(&src->error);
+
+    return src;
+}