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 <assert.h>
#include "spandsp/telephony.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"

Defines
#define	FALSE   0
#define	TRUE   (!FALSE)
#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)   (sizeof(a)/sizeof((a)[0]))
#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)
	SPAN_DECLARE_NONSTD (void)
void	v42_stop (v42_state_t *ss)
void	v42_rx_bit (void *user_data, int bit)
int	v42_tx_bit (void *user_data)
int	v42_set_local_busy_status (v42_state_t *s, int busy)
int	v42_get_far_busy_status (v42_state_t *s)
void	v42_set_status_callback (v42_state_t *s, 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, int calling_party, int detect, get_msg_func_t iframe_get, put_msg_func_t iframe_put, void *user_data)
void	v42_release (v42_state_t *s)
void	v42_free (v42_state_t *s)

---

Detailed Description

---

Function Documentation

void v42_free

(

v42_state_t *

s

)

Free a V.42 context.

Parameters:

s

The V.42 context.

Returns:

0 if OK

References v42_release().

int v42_get_far_busy_status

(

v42_state_t *

s

)

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

Parameters:

s

The V.42 context.

Returns:

The far end busy status.

v42_state_t* v42_init	(	v42_state_t *	s,
		int	calling_party,
		int	detect,
		get_msg_func_t	iframe_get,
		put_msg_func_t	iframe_put,
		void *	user_data
	)

Initialise a V.42 context.

Parameters:

	s	The V.42 context.
	calling_party	TRUE if caller mode, else answerer mode.
	detect	TRUE to perform the V.42 detection, else go straight into LAP.M
	iframe_get	A callback function to handle received frames of data.
	iframe_put	A callback function to get frames of data for transmission.
	user_data	An opaque pointer passed to the frame handler routines.

Returns:

???

void v42_release

(

v42_state_t *

s

)

Release a V.42 context.

Parameters:

s

The V.42 context.

Returns:

0 if OK

Referenced by v42_free().

void v42_restart

(

v42_state_t *

s

)

Restart a V.42 context.

Parameters:

s

The V.42 context.

References hdlc_rx_init(), and hdlc_tx_init().

int v42_set_local_busy_status	(	v42_state_t *	s,
		int	busy
	)

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

Parameters:

	s	The V.42 context.
	busy	The new local end busy status.

Returns:

The previous local end busy status.