1 files changed, 66 insertions, 0 deletions
diff --git a/gr-blocks/lib/unpack_k_bits.cc b/gr-blocks/lib/unpack_k_bits.cc
new file mode 100644
index 0000000000..f274cf5b60
--- /dev/null
+++ b/gr-blocks/lib/unpack_k_bits.cc
@@ -0,0 +1,66 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/blocks/unpack_k_bits.h>
+#include <gnuradio/io_signature.h>
+#include <stdexcept>
+#include <iostream>
+
+namespace gr {
+  namespace blocks {
+    namespace kernel {
+
+      unpack_k_bits::unpack_k_bits(unsigned k)
+        : d_k(k)
+      {
+        if(d_k == 0)
+          throw std::out_of_range("unpack_k_bits: k must be > 0");
+      }
+
+      unpack_k_bits::~unpack_k_bits()
+      {
+      }
+
+      void
+      unpack_k_bits::unpack(unsigned char *bits, const unsigned char *bytes, int nbytes) const
+      {
+        int n = 0;
+        for(int i = 0; i < nbytes; i++) {
+          unsigned int t = bytes[i];
+          for(int j = d_k - 1; j >= 0; j--)
+            bits[n++] = (t >> j) & 0x01;
+        }
+      }
+
+      int
+      unpack_k_bits::k() const
+      {
+        return d_k;
+      }
+
+    } /* namespace kernel */
+  } /* namespace blocks */
+} /* namespace gr */