1 files changed, 70 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/general/gr_skiphead.cc b/gnuradio-core/src/lib/general/gr_skiphead.cc
new file mode 100644
index 000000000..599d00bf6
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_skiphead.cc
@@ -0,0 +1,70 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005 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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <gr_skiphead.h>
+#include <gr_io_signature.h>
+
+gr_skiphead::gr_skiphead (size_t sizeof_stream_item, int nitems)
+  : gr_sync_block ("skiphead",
+       gr_make_io_signature (1, 1, sizeof_stream_item),
+       gr_make_io_signature (1, 1, sizeof_stream_item)),
+    d_nitems (nitems), d_nskipped_items (0)
+{
+}
+
+gr_block_sptr
+gr_make_skiphead (size_t sizeof_stream_item, int nitems)
+{
+  return gr_block_sptr (new gr_skiphead (sizeof_stream_item, nitems));
+}
+
+int
+gr_skiphead::work (int noutput_items,
+        gr_vector_const_void_star &input_items,
+        gr_vector_void_star &output_items)
+{
+  int items_to_skip = d_nitems - d_nskipped_items;
+  if (items_to_skip <=0)
+  {
+     //Done with skipping, copy all input to the output;
+     memcpy (output_items[0], input_items[0], noutput_items * input_signature()->sizeof_stream_item (0));
+     return noutput_items;
+  } else if (items_to_skip < noutput_items)
+  {
+     memcpy (output_items[0], &(((char *)input_items[0])[items_to_skip*input_signature()->sizeof_stream_item (0)]), (noutput_items -items_to_skip) * input_signature()->sizeof_stream_item (0));
+    //memcpy (output_items[0], &((input_items[0])[items_to_skip]), (noutput_items -items_to_skip) * input_signature()->sizeof_stream_item (0));
+     //memcpy (output_items[0], input_items[0]+items_to_skip*input_signature()->sizeof_stream_item (0), (noutput_items -items_to_skip) * input_signature()->sizeof_stream_item (0));
+     d_nskipped_items += items_to_skip;
+     consume_each (items_to_skip);
+     return (noutput_items -items_to_skip);
+  } else
+  {
+     d_nskipped_items += noutput_items;
+     consume_each (items_to_skip);
+     return 0;
+  }
+
+  return -1;//Should never get here
+}