1 files changed, 61 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_fseek.c b/src/Common/libzip/zip_fseek.c
new file mode 100644
index 00000000..33136155
--- /dev/null
+++ b/src/Common/libzip/zip_fseek.c
@@ -0,0 +1,61 @@
+/*
+  zip_fseek.c -- seek in file
+  Copyright (C) 2016-2021 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <info@libzip.org>
+
+  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 zip_int8_t
+zip_fseek(zip_file_t *zf, zip_int64_t offset, int whence) {
+    if (!zf)
+        return -1;
+
+    if (zf->error.zip_err != 0)
+        return -1;
+
+    if (zip_source_seek(zf->src, offset, whence) < 0) {
+        _zip_error_set_from_source(&zf->error, zf->src);
+        return -1;
+    }
+
+    return 0;
+}
+
+
+ZIP_EXTERN int
+zip_file_is_seekable(zip_file_t *zfile) {
+    if (!zfile) {
+        return -1;
+    }
+    
+    return ZIP_SOURCE_CHECK_SUPPORTED(zip_source_supports(zfile->src), ZIP_SOURCE_SEEK);
+}