/usr/include/codec2/varicode.h is in libcodec2-dev 0.5.1-1+b2.
This file is owned by root:root, with mode 0o644.
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// Name: varicode.h
// Purpose: Varicode encoded and decode functions
// Created: Nov 24, 2012
// Authors: David Rowe
//
// License:
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2.1,
// as published by the Free Software Foundation. This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
//
//==========================================================================
#ifndef __VARICODE__
#define __VARICODE__
#ifdef __cplusplus
extern "C" {
#endif
#define VARICODE_MAX_BITS (10+2) /* max varicode bits for each ascii character */
/* 10 bits for code plus 2 0 bits for inter-character space */
struct VARICODE_DEC {
int state;
int n_zeros;
int v_len;
unsigned short packed;
int code_num;
int n_in;
int in[2];
};
int varicode_encode(short varicode_out[], char ascii_in[], int max_out, int n_in, int code_num);
void varicode_decode_init(struct VARICODE_DEC *dec_states, int code_num);
int varicode_decode(struct VARICODE_DEC *dec_states, char ascii_out[], short varicode_in[], int max_out, int n_in);
void varicode_set_code_num(struct VARICODE_DEC *dec_states, int code_num);
#ifdef __cplusplus
}
#endif
#endif
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