/* -*- c++ -*- */
/*
 * Copyright 2005,2006,2011,2012 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_CORRELATE_ACCESS_CODE_BB_H
#define INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H

#include <gnuradio/digital/api.h>
#include <gnuradio/sync_block.h>
#include <string>

namespace gr {
namespace digital {

/*!
 * \brief Examine input for specified access code, one bit at a time.
 * \ingroup packet_operators_blk
 * \ingroup deprecated_blk
 *
 * \details
 * input:  stream of bits, 1 bit per input byte (data in LSB)
 * output: stream of bits, 2 bits per output byte (data in LSB, flag in next higher bit)
 *
 * Each output byte contains two valid bits, the data bit, and the
 * flag bit. The LSB (bit 0) is the data bit, and is the original
 * input data, delayed 64 bits. Bit 1 is the flag bit and is 1 if
 * the corresponding data bit is the first data bit following the
 * access code. Otherwise the flag bit is 0.
 */
class DIGITAL_API correlate_access_code_bb : virtual public sync_block
{
public:
    // gr::digital::correlate_access_code_bb::sptr
    typedef boost::shared_ptr<correlate_access_code_bb> sptr;

    /*!
     * Make a correlate_access_code block.
     *
     * \param access_code is represented with 1 byte per bit,
     *                    e.g., "010101010111000100"
     * \param threshold maximum number of bits that may be wrong
     */
    static sptr make(const std::string& access_code, int threshold);

    /*!
     * Set a new access code.
     *
     * \param access_code is represented with 1 byte per bit,
     *                    e.g., "010101010111000100"
     */
    virtual bool set_access_code(const std::string& access_code) = 0;
};

} /* namespace digital */
} /* namespace gr */

#endif /* INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H */
