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authorMatthias P. Braendli <matthias.braendli@mpb.li>2018-02-09 10:06:34 +0100
committerMatthias P. Braendli <matthias.braendli@mpb.li>2018-02-09 10:06:34 +0100
commitd10839ab23b4ac4dea5ba183c451b650dd07331a (patch)
tree5f78e10a89134a2a167315a42bc21c5cc3a3cdbb /lib/fec/rs-common.h
parentd1b74c21d8c6f816179cd700dd5859f51bf01d88 (diff)
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Move external code to lib and stop using SUBDIRS
Diffstat (limited to 'lib/fec/rs-common.h')
-rw-r--r--lib/fec/rs-common.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/fec/rs-common.h b/lib/fec/rs-common.h
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+/* 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;
+}