spandsp 3.0.0
v42.c File Reference
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include "spandsp/stdbool.h"
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/alloc.h"
#include "spandsp/unaligned.h"
#include "spandsp/logging.h"
#include "spandsp/bit_operations.h"
#include "spandsp/async.h"
#include "spandsp/hdlc.h"
#include "spandsp/v42.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/hdlc.h"
#include "spandsp/private/v42.h"

Macros

#define T_400   750
#define T_401   1000
#define T_402   1000
#define T_403   10000
#define LAPM_DLCI_DTE_TO_DTE   0
#define LAPM_DLCI_LAYER2_MANAGEMENT   63
#define elements(a)
#define LAPM_FRAMETYPE_MASK   0x03
#define LAPM_S_PF   0x01
#define LAPM_U_PF   0x10
#define FI_GENERAL   0x82
#define GI_PARAM_NEGOTIATION   0x80
#define GI_PRIVATE_NEGOTIATION   0xF0
#define GI_USER_DATA   0xFF
#define LAPM_DLCI_DTE_TO_DTE   0
#define LAPM_DLCI_LAYER2_MANAGEMENT   63

Enumerations

enum  { LAPM_FRAMETYPE_I = 0x00 , LAPM_FRAMETYPE_I_ALT = 0x02 , LAPM_FRAMETYPE_S = 0x01 , LAPM_FRAMETYPE_U = 0x03 }
enum  { LAPM_S_RR = 0x00 , LAPM_S_RNR = 0x04 , LAPM_S_REJ = 0x08 , LAPM_S_SREJ = 0x0C }
enum  {
  LAPM_U_UI = 0x00 , LAPM_U_DM = 0x0C , LAPM_U_DISC = 0x40 , LAPM_U_UA = 0x60 ,
  LAPM_U_SABME = 0x6C , LAPM_U_FRMR = 0x84 , LAPM_U_XID = 0xAC , LAPM_U_TEST = 0xE0
}
enum  {
  PI_HDLC_OPTIONAL_FUNCTIONS = 0x03 , PI_TX_INFO_MAXSIZE = 0x05 , PI_RX_INFO_MAXSIZE = 0x06 , PI_TX_WINDOW_SIZE = 0x07 ,
  PI_RX_WINDOW_SIZE = 0x08
}
enum  { PI_PARAMETER_SET_ID = 0x00 , PI_V42BIS_COMPRESSION_REQUEST = 0x01 , PI_V42BIS_NUM_CODEWORDS = 0x02 , PI_V42BIS_MAX_STRING_LENGTH = 0x03 }
enum  {
  LAPM_DETECT = 0 , LAPM_IDLE = 1 , LAPM_ESTABLISH = 2 , LAPM_DATA = 3 ,
  LAPM_RELEASE = 4 , LAPM_SIGNAL = 5 , LAPM_SETPARM = 6 , LAPM_TEST = 7 ,
  LAPM_V42_UNSUPPORTED = 8
}

Functions

const char * lapm_status_to_str (int status)
void lapm_receive (void *user_data, const uint8_t *frame, int len, int ok)
void v42_stop (v42_state_t *ss)
void v42_rx_bit (void *user_data, int bit)
int v42_tx_bit (void *user_data)
bool v42_set_local_busy_status (v42_state_t *s, bool busy)
bool v42_get_far_busy_status (v42_state_t *s)
logging_state_t * v42_get_logging_state (v42_state_t *s)
 Get the logging context associated with a V.42 context.
void v42_set_status_callback (v42_state_t *s, span_modem_status_func_t status_handler, void *user_data)
void v42_restart (v42_state_t *s)
v42_state_t * v42_init (v42_state_t *ss, bool calling_party, bool detect, span_get_msg_func_t iframe_get, span_put_msg_func_t iframe_put, void *user_data)
int v42_release (v42_state_t *s)
int v42_free (v42_state_t *s)

Macro Definition Documentation

◆ elements

#define elements ( a)
Value:
(sizeof(a)/sizeof((a)[0]))

Function Documentation

◆ v42_free()

int v42_free ( v42_state_t * s)

Free a V.42 context.

Parameters
sThe V.42 context.
Returns
0 if OK

◆ v42_get_far_busy_status()

bool v42_get_far_busy_status ( v42_state_t * s)

Get the busy status of the far end of a V.42 context.

Parameters
sThe V.42 context.
Returns
The far end busy status.

◆ v42_get_logging_state()

logging_state_t * v42_get_logging_state ( v42_state_t * s)

Get the logging context associated with a V.42 context.

Get the logging context associated with a V.42 context.

Parameters
sThe V.42 context.
Returns
A pointer to the logging context

References v42_state_s::logging.

◆ v42_init()

v42_state_t * v42_init ( v42_state_t * s,
bool calling_party,
bool detect,
span_get_msg_func_t iframe_get,
span_put_msg_func_t iframe_put,
void * user_data )

Initialise a V.42 context.

Parameters
sThe V.42 context.
calling_partyTrue if caller mode, else answerer mode.
detectTrue to perform the V.42 detection, else go straight into LAP.M
iframe_getA callback function to handle received frames of data.
iframe_putA callback function to get frames of data for transmission.
user_dataAn opaque pointer passed to the frame handler routines.
Returns
???

References v42_state_s::calling_party, v42_state_s::detect, v42_state_s::logging, and v42_state_s::tx_bit_rate.

◆ v42_release()

int v42_release ( v42_state_t * s)

Release a V.42 context.

Parameters
sThe V.42 context.
Returns
0 if OK

◆ v42_restart()

void v42_restart ( v42_state_t * s)

Restart a V.42 context.

Parameters
sThe V.42 context.

References v42_state_s::detect, hdlc_rx_init(), hdlc_tx_init(), and v42_negotiation_t::rx_negotiation_step.

◆ v42_set_local_busy_status()

bool v42_set_local_busy_status ( v42_state_t * s,
bool busy )

Set the busy status of the local end of a V.42 context.

Parameters
sThe V.42 context.
busyThe new local end busy status.
Returns
The previous local end busy status.