/usr/include/spandsp/private/v42bis.h is in libspandsp-dev 0.0.6~pre20-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* SpanDSP - a series of DSP components for telephony
*
* private/v42bis.h
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2005 Steve Underwood
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#if !defined(_SPANDSP_PRIVATE_V42BIS_H_)
#define _SPANDSP_PRIVATE_V42BIS_H_
/*!
V.42bis dictionary node.
*/
typedef struct
{
/*! \brief The prior code for each defined code. */
uint16_t parent_code;
/*! \brief The number of leaf nodes this node has */
int16_t leaves;
/*! \brief This leaf octet for each defined code. */
uint8_t node_octet;
/*! \brief Bit map of the children which exist */
uint32_t children[8];
} v42bis_dict_node_t;
/*!
V.42bis compression. This defines the working state for a single instance
of V.42bis compression.
*/
typedef struct
{
/*! \brief Compression mode. */
int compression_mode;
/*! \brief Callback function to handle received frames. */
v42bis_frame_handler_t handler;
/*! \brief An opaque pointer passed in calls to frame_handler. */
void *user_data;
/*! \brief The maximum frame length allowed */
int max_len;
uint32_t string_code;
uint32_t latest_code;
int string_length;
uint32_t output_bit_buffer;
int output_bit_count;
int output_octet_count;
uint8_t output_buf[1024];
v42bis_dict_node_t dict[V42BIS_MAX_CODEWORDS];
/*! \brief TRUE if we are in transparent (i.e. uncompressable) mode */
int transparent;
int change_transparency;
/*! \brief IIR filter state, used in assessing compressibility. */
int compressibility_filter;
int compressibility_persistence;
/*! \brief Next empty dictionary entry */
uint32_t v42bis_parm_c1;
/*! \brief Current codeword size */
int v42bis_parm_c2;
/*! \brief Threshold for codeword size change */
uint32_t v42bis_parm_c3;
/*! \brief Mark that this is the first octet/code to be processed */
int first;
uint8_t escape_code;
} v42bis_compress_state_t;
/*!
V.42bis decompression. This defines the working state for a single instance
of V.42bis decompression.
*/
typedef struct
{
/*! \brief Callback function to handle decompressed data. */
v42bis_data_handler_t handler;
/*! \brief An opaque pointer passed in calls to data_handler. */
void *user_data;
/*! \brief The maximum decompressed data block length allowed */
int max_len;
uint32_t old_code;
uint32_t last_old_code;
uint32_t input_bit_buffer;
int input_bit_count;
int octet;
int last_length;
int output_octet_count;
uint8_t output_buf[1024];
v42bis_dict_node_t dict[V42BIS_MAX_CODEWORDS];
/*! \brief TRUE if we are in transparent (i.e. uncompressable) mode */
int transparent;
int last_extra_octet;
/*! \brief Next empty dictionary entry */
uint32_t v42bis_parm_c1;
/*! \brief Current codeword size */
int v42bis_parm_c2;
/*! \brief Threshold for codeword size change */
uint32_t v42bis_parm_c3;
/*! \brief Mark that this is the first octet/code to be processed */
int first;
uint8_t escape_code;
int escaped;
} v42bis_decompress_state_t;
/*!
V.42bis compression/decompression descriptor. This defines the working state for a
single instance of V.42bis compress/decompression.
*/
struct v42bis_state_s
{
/*! \brief V.42bis data compression directions. */
int v42bis_parm_p0;
/*! \brief Compression state. */
v42bis_compress_state_t compress;
/*! \brief Decompression state. */
v42bis_decompress_state_t decompress;
/*! \brief Maximum codeword size (bits) */
int v42bis_parm_n1;
/*! \brief Total number of codewords */
uint32_t v42bis_parm_n2;
/*! \brief Maximum string length */
int v42bis_parm_n7;
};
#endif
/*- End of file ------------------------------------------------------------*/
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