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/* -*- c++ -*- */
/*
* Copyright 2014 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_ASYNC_BB_H
#define INCLUDED_DIGITAL_CRC32_ASYNC_BB_H
#include <gnuradio/digital/api.h>
#include <gnuradio/block.h>
namespace gr {
namespace digital {
/*!
* \brief Byte-stream CRC block for async messages
* \ingroup packet_operators_blk
*
* \details
*
* Processes packets (as async PDU messages) for CRC32. The \p
* check parameter determines if the block acts to check and strip
* the CRC or to calculate and append the CRC32.
*
* The input PDU is expected to be a message of packet bytes.
*
* When using check mode, if the CRC passes, the output is a
* payload of the message with the CRC stripped, so the output
* will be 4 bytes smaller than the input.
*
* When using calculate mode (check == false), then the CRC is
* calculated on the PDU and appended to it. The output is then 4
* bytes longer than the input.
*
* This block implements the CRC32 using the Boost crc_optimal
* class for 32-bit CRCs with the standard generator 0x04C11DB7.
*/
class DIGITAL_API crc32_async_bb : virtual public block
{
public:
typedef boost::shared_ptr<crc32_async_bb> sptr;
/*!
* \param check Set to true if you want to check CRC, false to create CRC.
*/
static sptr make(bool check=false);
};
} // namespace digital
} // namespace gr
#endif /* INCLUDED_DIGITAL_CRC32_ASYNC_BB_H */
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