X-Git-Url: https://git.gag.com/?p=debian%2Fgnuradio;a=blobdiff_plain;f=gnuradio-core%2Fsrc%2Flib%2Fgeneral%2Fgr_additive_scrambler_bb.cc;fp=gnuradio-core%2Fsrc%2Flib%2Fgeneral%2Fgr_additive_scrambler_bb.cc;h=91e02c2d3e52bd5f6f05d355876326fa8c20f1c3;hp=0000000000000000000000000000000000000000;hb=8a9ddbb0675f9bfcc6e03b457fba6c79474a3693;hpb=82d471b9b4a8b389b5da44b19c69c36420828382

diff --git a/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc
new file mode 100644
index 00000000..91e02c2d
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc
@@ -0,0 +1,65 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2010 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_additive_scrambler_bb.h>
+#include <gr_io_signature.h>
+
+gr_additive_scrambler_bb_sptr
+gr_make_additive_scrambler_bb(int mask, int seed, int len, int count)
+{
+  return gr_additive_scrambler_bb_sptr(new gr_additive_scrambler_bb(mask, seed, len, count));
+}
+
+gr_additive_scrambler_bb::gr_additive_scrambler_bb(int mask, int seed, int len, int count)
+  : gr_sync_block("additive_scrambler_bb",
+		  gr_make_io_signature (1, 1, sizeof (unsigned char)),
+		  gr_make_io_signature (1, 1, sizeof (unsigned char))),
+    d_lfsr(mask, seed, len),
+    d_count(count),
+    d_bits(0)
+{
+}
+
+int
+gr_additive_scrambler_bb::work(int noutput_items,
+			       gr_vector_const_void_star &input_items,
+			       gr_vector_void_star &output_items)
+{
+  const unsigned char *in = (const unsigned char *) input_items[0];
+  unsigned char *out = (unsigned char *) output_items[0];
+
+  for (int i = 0; i < noutput_items; i++) {
+    out[i] = in[i]^d_lfsr.next_bit();
+    if (d_count > 0) {
+      if (++d_bits == d_count) {
+	d_lfsr.reset();
+	d_bits = 0;
+      }
+    }
+  }
+  
+  return noutput_items;
+}