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/* -*- c++ -*- */
/*
* Copyright 2006 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 2, 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef INCLUDED_ENCODER_H
#define INCLUDED_ENCODER_H
#include "code_types.h"
// the 'encoder' class is a virtual class upon which all encoder types
// can be built.
class encoder
{
public:
encoder () {};
virtual ~encoder () {};
virtual size_t compute_n_input_bits (size_t n_output_bits) = 0;
virtual size_t compute_n_output_bits (size_t n_input_bits) = 0;
virtual size_t encode (const char** in_buf,
char** out_buf,
size_t n_bits_to_output);
virtual size_t encode (const char** in_buf,
size_t n_bits_to_input,
char** out_buf);
/* for remote access to internal info */
inline size_t block_size_bits () {return (d_block_size_bits);};
inline size_t n_code_inputs () {return (d_n_code_inputs);};
inline size_t n_code_outputs () {return (d_n_code_outputs);};
protected:
/* encode_private: encode the given in_buf and write the output bits
* to the out_buf, using internal class variables. This function is
* called from the publically available "encode()" methods, which
* first set the internal class variables before executing.
*/
virtual void encode_private (const char** in_buf, char** out_buf) = 0;
/* inheriting methods need to figure out what makes the most sense
* for them in terms of getting new inputs and writing outputs.
*/
size_t d_block_size_bits, d_n_code_inputs, d_n_code_outputs;
size_t d_n_enc_bits, d_total_n_enc_bits;
size_t d_in_buf_ndx, d_out_buf_ndx;
size_t d_in_bit_shift, d_out_bit_shift;
size_t d_n_input_bits_left, d_n_output_bits_left;
};
#endif /* INCLUDED_ENCODER_H */
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