1 files changed, 67 insertions, 0 deletions
diff --git a/gr-digital/include/digital_crc32_bb.h b/gr-digital/include/digital_crc32_bb.h
new file mode 100644
index 0000000000..1f4771e861
--- /dev/null
+++ b/gr-digital/include/digital_crc32_bb.h
@@ -0,0 +1,67 @@
+/* -*- c++ -*- */
+/* Copyright 2012 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_DIGITAL_CRC32_BB_H
+#define INCLUDED_DIGITAL_CRC32_BB_H
+
+#include <digital_api.h>
+#include <gr_tagged_stream_block.h>
+
+class digital_crc32_bb;
+
+typedef boost::shared_ptr<digital_crc32_bb> digital_crc32_bb_sptr;
+
+DIGITAL_API digital_crc32_bb_sptr digital_make_crc32_bb (bool check=false, const std::string& lengthtagname="packet_len");
+
+/*!
+ * \brief Byte-stream CRC block
+ * \ingroup digital
+ *
+ * Input: stream of bytes, which form a packet. The first byte of the packet
+ * has a tag with key "length" and the value being the number of bytes in the
+ * packet.
+ *
+ * Output: The same bytes as incoming, but trailing a CRC32 of the packet.
+ * The tag is re-set to the new length.
+ */
+class DIGITAL_API digital_crc32_bb : public gr_tagged_stream_block
+{
+ private:
+  friend DIGITAL_API digital_crc32_bb_sptr digital_make_crc32_bb (bool check, const std::string& lengthtagname);
+
+  bool d_check;
+
+  digital_crc32_bb(bool check, const std::string& lengthtagname);
+
+ public:
+  ~digital_crc32_bb();
+
+  int calculate_output_stream_length(const std::vector<int> &ninput_items);
+
+  int work (int noutput_items,
+      gr_vector_int &ninput_items,
+      gr_vector_const_void_star &input_items,
+      gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_DIGITAL_CRC32_BB_H */
+