91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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* databits.h
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*
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* Copyright (C) 2012 Kamal Mostafa <kamal@whence.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Reverses the ordering of the bits on an integer
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static inline unsigned long long
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bit_reverse(unsigned long long value,
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unsigned int bits)
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{
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unsigned int out = 0;
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while (bits--) {
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out = (out << 1) | (value & 1);
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value >>= 1;
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}
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return out;
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}
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// Gets "bits" bits from "value" starting "offset" bits from the start
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static inline unsigned long long
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bit_window(unsigned long long value,
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unsigned int offset,
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unsigned int bits)
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{
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unsigned long long mask = (1ULL << bits) - 1;
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value = (value >> offset) & mask;
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return value;
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}
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typedef int (databits_encoder)(
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unsigned int *databits_outp, char char_out );
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typedef unsigned int (databits_decoder)(
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char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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int
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databits_encode_ascii8( unsigned int *databits_outp, char char_out );
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unsigned int
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databits_decode_ascii8( char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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#include "baudot.h"
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#define databits_encode_baudot baudot_encode // from baudot.h
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//int
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//databits_encode_baudot( unsigned int *databits_outp, char char_out );
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unsigned int
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databits_decode_baudot( char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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int
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databits_encode_binary( unsigned int *databits_outp, char char_out );
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unsigned int
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databits_decode_binary( char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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unsigned int
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databits_decode_callerid( char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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unsigned int
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databits_decode_uic_ground( char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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unsigned int
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databits_decode_uic_train( char *dataout_p, unsigned int dataout_size,
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unsigned long long bits, unsigned int n_databits );
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