Add corrections from tgotic

backend/qrrs.h

@@ -0,0 +1,48 @@
+/* qrrs.h - Reed Solomon routines for QR Code
+
+   This file pinched wholesale from libqrencode and unchanged hence
+   original copyright and license applies as below
+*/
+
+/*
+ * qrencode - QR Code encoder
+ *
+ * Reed solomon encoder. This code is taken from Phil Karn's libfec then
+ * editted and packed into a pair of .c and .h files.
+ *
+ * Copyright (C) 2002, 2003, 2004, 2006 Phil Karn, KA9Q
+ * (libfec is released under the GNU Lesser General Public License.)
+ *
+ * Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi@megaui.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __QRRS_H__
+#define __QRRS_H__
+
+/*
+ * General purpose RS codec, 8-bit symbols.
+ */
+
+typedef struct _RS RS;
+
+/* WARNING: Thread unsafe!!! */
+extern RS *init_rs(int symsize, int gfpoly, int fcr, int prim, int nroots, int pad);
+extern void encode_rs_char(RS *rs, const unsigned char *data, unsigned char *parity);
+extern void free_rs_char(RS *rs);
+extern void free_rs_cache(void);
+
+#endif /* __QRRS_H__ */