From 09e514732788d821189c59ddc58e70355ba1a3cb Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 23 Sep 2019 20:09:39 +0200
Subject: Add code from common repository

---
 lib/fec/rs-common.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 lib/fec/rs-common.h

(limited to 'lib/fec/rs-common.h')

diff --git a/lib/fec/rs-common.h b/lib/fec/rs-common.h
new file mode 100644
index 0000000..e64eb39
--- /dev/null
+++ b/lib/fec/rs-common.h
@@ -0,0 +1,26 @@
+/* Stuff common to all the general-purpose Reed-Solomon codecs
+ * Copyright 2004 Phil Karn, KA9Q
+ * May be used under the terms of the GNU Lesser General Public License (LGPL)
+ */
+
+/* Reed-Solomon codec control block */
+struct rs {
+  int mm;              /* Bits per symbol */
+  int nn;              /* Symbols per block (= (1<<mm)-1) */
+  data_t *alpha_to;     /* log lookup table */
+  data_t *index_of;     /* Antilog lookup table */
+  data_t *genpoly;      /* Generator polynomial */
+  int nroots;     /* Number of generator roots = number of parity symbols */
+  int fcr;        /* First consecutive root, index form */
+  int prim;       /* Primitive element, index form */
+  int iprim;      /* prim-th root of 1, index form */
+  int pad;        /* Padding bytes in shortened block */
+};
+
+static inline int modnn(struct rs *rs,int x){
+  while (x >= rs->nn) {
+    x -= rs->nn;
+    x = (x >> rs->mm) + (x & rs->nn);
+  }
+  return x;
+}
-- 
cgit v1.2.3