--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libzip/lib/zip_source_open.c	Wed Jun 29 09:24:55 2016 +0200
@@ -0,0 +1,73 @@
+/*
+  zip_source_open.c -- open zip_source (prepare for reading)
+  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_EXTERN int
+zip_source_open(zip_source_t *src)
+{
+    if (src->source_closed) {
+        return -1;
+    }
+    if (src->write_state == ZIP_SOURCE_WRITE_REMOVED) {
+        zip_error_set(&src->error, ZIP_ER_DELETED, 0);
+	return -1;
+    }
+
+    if (ZIP_SOURCE_IS_OPEN_READING(src)) {
+	if ((zip_source_supports(src) & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_SEEK)) == 0) {
+	    zip_error_set(&src->error, ZIP_ER_INUSE, 0);
+	    return -1;
+	}
+    }
+    else {
+	if (ZIP_SOURCE_IS_LAYERED(src)) {
+	    if (zip_source_open(src->src) < 0) {
+		_zip_error_set_from_source(&src->error, src->src);
+		return -1;
+	    }
+	}
+	
+	if (_zip_source_call(src, NULL, 0, ZIP_SOURCE_OPEN) < 0) {
+	    if (ZIP_SOURCE_IS_LAYERED(src)) {
+		zip_source_close(src->src);
+	    }
+	    return -1;
+	}
+    }
+
+    src->open_count++;
+    
+    return 0;
+}