#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/bit_operations.h"
#include "spandsp/v42bis.h"
Defines | |
#define | V42BIS_N3 8 |
#define | V42BIS_N4 256 |
#define | V42BIS_N5 (V42BIS_N4 + V42BIS_N6) |
#define | V42BIS_N6 3 |
Enumerations | |
enum | { V42BIS_ETM = 0, V42BIS_FLUSH = 1, V42BIS_STEPUP = 2 } |
enum | { V42BIS_ECM = 0, V42BIS_EID = 1, V42BIS_RESET = 2 } |
Functions | |
int | v42bis_compress (v42bis_state_t *s, const uint8_t *buf, int len) |
int | v42bis_compress_flush (v42bis_state_t *s) |
int | v42bis_decompress (v42bis_state_t *s, const uint8_t *buf, int len) |
int | v42bis_decompress_flush (v42bis_state_t *s) |
void | v42bis_compression_control (v42bis_state_t *s, int mode) |
v42bis_state_t * | v42bis_init (v42bis_state_t *s, int negotiated_p0, int negotiated_p1, int negotiated_p2, v42bis_frame_handler_t frame_handler, void *frame_user_data, int max_frame_len, v42bis_data_handler_t data_handler, void *data_user_data, int max_data_len) |
int | v42bis_release (v42bis_state_t *s) |
int v42bis_compress | ( | v42bis_state_t * | s, | |
const uint8_t * | buf, | |||
int | len | |||
) |
Compress a block of octets.
s | The V.42bis context. | |
buf | The data to be compressed. | |
len | The length of the data buffer. |
References v42bis_compress_state_t::change_transparency, v42bis_dict_node_t::children, v42bis_state_t::compress, v42bis_compress_state_t::compressibility_filter, v42bis_compress_state_t::compressibility_persistence, v42bis_compress_state_t::compression_mode, v42bis_compress_state_t::dict, v42bis_compress_state_t::escape_code, v42bis_compress_state_t::first, v42bis_compress_state_t::handler, v42bis_compress_state_t::latest_code, v42bis_dict_node_t::leaves, v42bis_compress_state_t::max_len, v42bis_dict_node_t::node_octet, v42bis_dict_node_t::parent_code, v42bis_compress_state_t::string_code, v42bis_compress_state_t::string_length, v42bis_compress_state_t::transparent, v42bis_compress_state_t::user_data, v42bis_compress_state_t::v42bis_parm_c1, v42bis_compress_state_t::v42bis_parm_c2, v42bis_compress_state_t::v42bis_parm_c3, v42bis_state_t::v42bis_parm_n2, v42bis_state_t::v42bis_parm_n7, and v42bis_state_t::v42bis_parm_p0.
int v42bis_compress_flush | ( | v42bis_state_t * | s | ) |
Flush out any data remaining in a compression buffer.
s | The V.42bis context. |
References v42bis_state_t::compress, v42bis_compress_state_t::handler, v42bis_compress_state_t::output_bit_buffer, v42bis_compress_state_t::output_bit_count, v42bis_compress_state_t::output_buf, v42bis_compress_state_t::output_octet_count, v42bis_compress_state_t::string_code, v42bis_compress_state_t::transparent, and v42bis_compress_state_t::user_data.
void v42bis_compression_control | ( | v42bis_state_t * | s, | |
int | mode | |||
) |
Set the compression mode.
s | The V.42bis context. | |
mode | One of the V.42bis compression modes - V42BIS_COMPRESSION_MODE_DYNAMIC, V42BIS_COMPRESSION_MODE_ALWAYS, V42BIS_COMPRESSION_MODE_NEVER |
References v42bis_compress_state_t::change_transparency, v42bis_state_t::compress, and v42bis_compress_state_t::compression_mode.
int v42bis_decompress | ( | v42bis_state_t * | s, | |
const uint8_t * | buf, | |||
int | len | |||
) |
Decompress a block of octets.
s | The V.42bis context. | |
buf | The data to be decompressed. | |
len | The length of the data buffer. |
References v42bis_state_t::decompress, v42bis_decompress_state_t::dict, v42bis_decompress_state_t::escape_code, v42bis_decompress_state_t::escaped, v42bis_decompress_state_t::first, v42bis_decompress_state_t::handler, v42bis_decompress_state_t::input_bit_buffer, v42bis_decompress_state_t::input_bit_count, v42bis_decompress_state_t::last_extra_octet, v42bis_decompress_state_t::last_length, v42bis_decompress_state_t::last_old_code, v42bis_dict_node_t::leaves, v42bis_decompress_state_t::max_len, v42bis_dict_node_t::node_octet, v42bis_decompress_state_t::octet, v42bis_decompress_state_t::old_code, v42bis_decompress_state_t::output_buf, v42bis_decompress_state_t::output_octet_count, v42bis_dict_node_t::parent_code, v42bis_decompress_state_t::transparent, v42bis_decompress_state_t::user_data, v42bis_decompress_flush(), v42bis_decompress_state_t::v42bis_parm_c1, v42bis_decompress_state_t::v42bis_parm_c2, v42bis_decompress_state_t::v42bis_parm_c3, v42bis_state_t::v42bis_parm_n2, v42bis_state_t::v42bis_parm_n7, and v42bis_state_t::v42bis_parm_p0.
int v42bis_decompress_flush | ( | v42bis_state_t * | s | ) |
Flush out any data remaining in the decompression buffer.
s | The V.42bis context. |
References v42bis_state_t::decompress, v42bis_decompress_state_t::handler, v42bis_decompress_state_t::output_buf, v42bis_decompress_state_t::output_octet_count, and v42bis_decompress_state_t::user_data.
Referenced by v42bis_decompress().
v42bis_state_t* v42bis_init | ( | v42bis_state_t * | s, | |
int | negotiated_p0, | |||
int | negotiated_p1, | |||
int | negotiated_p2, | |||
v42bis_frame_handler_t | frame_handler, | |||
void * | frame_user_data, | |||
int | max_frame_len, | |||
v42bis_data_handler_t | data_handler, | |||
void * | data_user_data, | |||
int | max_data_len | |||
) |
Initialise a V.42bis context.
s | The V.42bis context. | |
negotiated_p0 | The negotiated P0 parameter, from the V.42bis spec. | |
negotiated_p1 | The negotiated P1 parameter, from the V.42bis spec. | |
negotiated_p2 | The negotiated P2 parameter, from the V.42bis spec. | |
frame_handler | . | |
frame_user_data | . | |
max_frame_len | The maximum length that should be passed to the frame handler. | |
data_handler | . | |
data_user_data | . | |
max_data_len | The maximum length that should be passed to the data handler. |
References v42bis_state_t::compress, v42bis_compress_state_t::compression_mode, v42bis_state_t::decompress, v42bis_decompress_state_t::dict, v42bis_compress_state_t::dict, v42bis_decompress_state_t::first, v42bis_compress_state_t::first, v42bis_decompress_state_t::handler, v42bis_compress_state_t::handler, v42bis_decompress_state_t::last_extra_octet, v42bis_decompress_state_t::last_old_code, v42bis_compress_state_t::latest_code, v42bis_dict_node_t::leaves, v42bis_decompress_state_t::max_len, v42bis_compress_state_t::max_len, v42bis_dict_node_t::parent_code, v42bis_compress_state_t::string_code, v42bis_decompress_state_t::user_data, v42bis_compress_state_t::user_data, v42bis_decompress_state_t::v42bis_parm_c1, v42bis_compress_state_t::v42bis_parm_c1, v42bis_decompress_state_t::v42bis_parm_c2, v42bis_compress_state_t::v42bis_parm_c2, v42bis_decompress_state_t::v42bis_parm_c3, v42bis_compress_state_t::v42bis_parm_c3, v42bis_state_t::v42bis_parm_n1, v42bis_state_t::v42bis_parm_n2, v42bis_state_t::v42bis_parm_n7, and v42bis_state_t::v42bis_parm_p0.
int v42bis_release | ( | v42bis_state_t * | s | ) |
Release a V.42bis context.
s | The V.42bis context. |