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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_GR_BLOCKS_UNPACK_K_BITS_H
#define INCLUDED_GR_BLOCKS_UNPACK_K_BITS_H
#include <gnuradio/blocks/api.h>
#include <vector>
namespace gr {
namespace blocks {
namespace kernel {
/*!
* \brief Converts a byte with k relevant bits to k output bytes with 1 bit in the LSB.
*
* This is the algorithm kernel for the gr::blocks::unpack_k_bits_bb block.
*
* Example:
* k = 4
* in = [0xf5, 0x08]
* out = [0,1,0,1, 1,0,0,0]
*
* k = 8
* in = [0xf5, 0x08]
* out = [1,1,1,1, 0,1,0,1, 0,0,0,0, 1,0,0,0]
* \ingroup byte_operators_blk
*/
class BLOCKS_API unpack_k_bits
{
public:
/*!
* \brief Make an unpack_k_bits object.
* \param k number of bits to unpack.
*/
unpack_k_bits(unsigned k);
~unpack_k_bits();
/*!
* \brief Perform the unpacking.
*
* This function performs no bounds checking. It assumes that the
* input, \p in, has of length \p nbytes and that the output
* vector, \p out, has k*nbytes available for writing.
*
* \param bits output vector (1-bit per byte) of the unpacked data
* \param bytes The input vector of bytes to unpack
* \param nbytes The number of input bytes
*/
void unpack(unsigned char* bits, const unsigned char* bytes, int nbytes) const;
/*!
* Unpacks in reverse order from unpack().
*/
void unpack_rev(unsigned char* bits, const unsigned char* bytes, int nbytes) const;
int k() const;
private:
unsigned d_k;
};
} /* namespace kernel */
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_GR_BLOCKS_UNPACK_K_BITS_BB_H */
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