1 files changed, 60 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
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+++ b/gr-digital/include/digital/crc32_bb.h
@@ -0,0 +1,60 @@
+/* -*- c++ -*- */
+/* 
+ * Copyright 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.
+ */
+
+
+#ifndef INCLUDED_DIGITAL_CRC32_BB_H
+#define INCLUDED_DIGITAL_CRC32_BB_H
+
+#include <digital/api.h>
+#include <gr_tagged_stream_block.h>
+
+namespace gr {
+  namespace digital {
+
+    /*!
+     * \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 crc32_bb : virtual public gr_tagged_stream_block
+    {
+     public:
+      typedef boost::shared_ptr<crc32_bb> sptr;
+
+      /*!
+       * \param check Set to true if you want to check CRC, false to create CRC.
+       * \param lengthtagname Length tag key
+       */
+      static sptr make(bool check=false, const std::string& lengthtagname="packet_len");
+    };
+
+  } // namespace digital
+} // namespace gr
+
+#endif /* INCLUDED_DIGITAL_CRC32_BB_H */
+