README change

1 files changed, 60 insertions, 0 deletions

diff --git a/gnuradio-core/src/lib/general/gr_skiphead.h b/gnuradio-core/src/lib/general/gr_skiphead.h
new file mode 100644
index 000000000..899b40f27
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_skiphead.h
@@ -0,0 +1,60 @@
+/* -*- 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 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.
+ */
+
+#ifndef INCLUDED_GR_SKIPHEAD_H
+#define INCLUDED_GR_SKIPHEAD_H
+
+#include <gr_core_api.h>
+#include <gr_sync_block.h>
+#include <stddef.h>      // size_t
+
+class gr_skiphead;
+typedef boost::shared_ptr<gr_skiphead> gr_skiphead_sptr;
+
+GR_CORE_API gr_skiphead_sptr
+gr_make_skiphead (size_t itemsize, uint64_t nitems_to_skip);
+
+
+/*!
+ * \brief skips the first N items, from then on copies items to the output
+ * \ingroup slicedice_blk
+ *
+ * Useful for building test cases and sources which have metadata or junk at the start
+ */
+
+class GR_CORE_API gr_skiphead : public gr_block
+{
+  friend GR_CORE_API gr_skiphead_sptr gr_make_skiphead (size_t itemsize, uint64_t nitems_to_skip);
+  gr_skiphead (size_t itemsize, uint64_t nitems_to_skip);
+
+  uint64_t  		d_nitems_to_skip;
+  uint64_t		d_nitems;		// total items seen
+
+ public:
+
+  int general_work(int noutput_items,
+		   gr_vector_int &ninput_items,
+		   gr_vector_const_void_star &input_items,
+		   gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_GR_SKIPHEAD_H */