1 files changed, 77 insertions, 0 deletions
diff --git a/gr-blocks/lib/unpack_k_bits_bb_impl.cc b/gr-blocks/lib/unpack_k_bits_bb_impl.cc
new file mode 100644
index 0000000000..367100be84
--- /dev/null
+++ b/gr-blocks/lib/unpack_k_bits_bb_impl.cc
@@ -0,0 +1,77 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2010,2013 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 "unpack_k_bits_bb_impl.h"
+#include <gr_io_signature.h>
+#include <stdexcept>
+#include <iostream>
+
+namespace gr {
+  namespace blocks {
+
+    unpack_k_bits_bb::sptr
+    unpack_k_bits_bb::make(unsigned k)
+    {
+      return gnuradio::get_initial_sptr
+        (new unpack_k_bits_bb_impl(k));
+    }
+
+    unpack_k_bits_bb_impl::unpack_k_bits_bb_impl(unsigned k)
+      : gr_sync_interpolator("unpack_k_bits_bb",
+                             gr_make_io_signature(1, 1, sizeof(unsigned char)),
+                             gr_make_io_signature(1, 1, sizeof(unsigned char)),
+                             k),
+        d_k(k)
+    {
+      if(d_k == 0)
+        throw std::out_of_range("interpolation must be > 0");
+    }
+
+    unpack_k_bits_bb_impl::~unpack_k_bits_bb_impl()
+    {
+    }
+
+    int
+    unpack_k_bits_bb_impl::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];
+  
+      int n = 0;
+      for(unsigned int i = 0; i < noutput_items/d_k; i++) {
+        unsigned int t = in[i];
+        for(int j = d_k - 1; j >= 0; j--)
+          out[n++] = (t >> j) & 0x01;
+      }
+
+      assert(n == noutput_items);
+      return noutput_items;
+    }
+
+  } /* namespace blocks */
+} /* namespace gr */