?? fax.cpp
字號:
{
return(Send_Our_ID(FAX_FCF_TSI)); // send TSI frame
}
/* ******************************************************************** *
*
* Send_DIS -- Send the digital ID signal to caller
*
* returns: -2 = User pressed ESC
* -1 - Timeout
* 0 = successful
* 1 = unsuccesful
*
* ******************************************************************** */
int Fax::Send_DIS(void)
{
int i; // work variable
for (i = 3; i--; hmsg.data[i] = dis_msg[i]);// copy the DIS to hmsg.data
return(Send_Hmsg(FINAL, FAX_FCF_DIS, 3)); // send the DIS
}
/* ******************************************************************** *
*
* Send_DCS -- Send the digital control signal to called station
*
* returns: -2 = User pressed ESC
* -1 - Timeout
* 0 = successful
* 1 = unsuccesful
*
* ******************************************************************** */
int Fax::Send_DCS(void)
{
int i; // work variable
for (i = 3; i--; hmsg.data[i] = dcs_msg[i]);// copy the DCS to hmsg.data
return(Send_Hmsg(FINAL, FAX_FCF_DCS, 3)); // send the DCS
}
/* ******************************************************************** *
*
* HDLC_Mode -- Enter HDLC mode (transmit or receive)
*
* returns: -2 = User pressed ESC
* -1 - Timeout
* 0 = successful; CONNECT response from modem
* 1 = ERROR response from modem
*
* ******************************************************************** */
int Fax::HDLC_Mode(int dir) // setup for HDLC tx or rx
// 0 = transmit, 1 = receive
{
int rc; // return code
if ((dir == TRANSMIT) && NOT connected) // q. we transmitting?
{ // a. yes ..
cp->Write(FAX_SILENT); // .. request 80ms silence
rc = wait_for(FAX_OK, // wait for response
FAX_ERR, 5) - 1;
if (rc) // q. any problems?
return(rc); // a. yes .. return the error
}
else if (connected) // q. connected already?
{ // a. yes ..
connected = FALSE; // .. reset connect status
return(0); // .. and return ok
}
cp->Write(dir ? FAX_RX_HDLC : FAX_TX_HDLC); // start requested HDLC mode
rc = wait_for(FAX_CONN, FAX_NO_CARR, 60)-1; // see if we connect
}
/* ******************************************************************** *
*
* Data_Mode() -- Enter Fax Data mode (transmit or receive)
*
* returns: -2 = User pressed ESC
* -1 - Timeout
* 0 = successful; CONNECT response from modem
* 1 = NO CARRIER response from modem
*
* ******************************************************************** */
int Fax::Data_Mode(int dir, // 0 = transmit, 1 = receive
int speed) // speed for transfer
{
int rc; // return code
char msg[20]; // work area for message
if ((dir == TRANSMIT) && NOT connected) // q. we transmitting?
{ // a. yes ..
cp->Write(FAX_SILENT); // .. request 80ms silence
rc = wait_for(FAX_OK, // wait for response
FAX_ERR, 5) - 1;
if (rc) // q. any problems?
return(rc); // a. yes .. return the error
}
sprintf(msg, // in message area ..
dir ? FAX_RX_DATA : FAX_TX_DATA, // .. select direction of xfer
speed); // .. and build message
cp->Write(msg); // write to modem
rc = wait_for(FAX_CONN, FAX_NO_CARR, 60)-1; // see if we connect
return(rc); // return to caller
}
/* ******************************************************************** *
*
* Get_Line -- retrieve a CR-terminated line of information
*
* returns: -2 = User pressed ESC
* -1 - Timeout
* 0 = successful
* 1 = data overrun
*
* ******************************************************************** */
int Fax::Get_Line(char *buf, // buffer to contain info
int secs) // length of timeout
{
int loop = TRUE; // loop condition
char wc; // work for msr, lsr
long timer; // timer value
timer = SECS(secs); // initialize timer
while(loop) // for as long as necessary ..
{
switch(cp->Read(buf, &wc, &wc)) // attempting to read a byte
{
case -1: // no character available
if (TimeOut(&timer)) // q. timeout?
return(-1); // a. yes.. tell the caller
if ((stat)(0, &fs)) // q. user press escape?
return(-2); // a. yes.. tell the caller
continue; // else .. continue loop
case 0: // character received
if (*buf == '\r') // q. character a CR?
{ // a. yes ..
*buf = 0; // .. null it out
loop = FALSE; // .. and end the loop
}
else // else ..
buf++; // .. point to next char position
break; // end this case
default: // lost characters
return(1); // .. show receive unsuccessful
}
}
return(0); // show we finished ok
}
/* ******************************************************************** *
*
* Get_Char -- retrieve a single character
*
* returns: -2 = User pressed ESC
* -1 - Timeout
* 0 = successful
* 1 = data overrun
*
* ******************************************************************** */
int Fax::Get_Char(char *c, // character to retrieve
int secs) // length of timeout
{
int loop = TRUE; // loop condition
char wc; // work for msr, lsr
long timer; // timer value
timer = SECS(secs); // initialize timer
while(loop) // for as long as necessary ..
{
switch(cp->Read(c, &wc, &wc)) // attempting to read a byte
{
case -1: // no character available
if (TimeOut(&timer)) // q. timeout?
return(-1); // a. yes.. tell the caller
if ((stat)(0, &fs)) // q. user press escape?
return(-2); // a. yes.. tell the caller
continue; // else .. continue loop
case 0: // character received
loop = FALSE; // .. end the loop
break;
default: // lost characters
return(1); // .. show receive unsuccessful
}
}
return(0); // show we finished ok
}
/* ******************************************************************** *
*
* Display_Msg -- display a message without parameters
*
* ******************************************************************** */
void Fax::Display_Msg(int msgno)
{
fs.f_ptr = fax_msgs[msgno]; // set the address
(stat)(2, &fs); // display the message
}
/* ******************************************************************** *
*
* Reverse_Byte() -- Reverse the bits in a byte
*
* ******************************************************************** */
UCHAR Fax::Reverse_Byte(UCHAR value) // byte to reverse
{
__asm mov cx, 8 // cx = bits to shift
__asm mov al, value // al = starting value
top_loop: // top of reverse loop
__asm shl ah, 1 // shift ah up by one
__asm shr al, 1 // shift out a bit
__asm adc ah, 0 // .. add carry into ah
__asm loop top_loop // .. until all bits moved
__asm mov value, ah // save reversed value
return(value); // .. and return it
}
/* ******************************************************************** *
*
* Reverse_Bytes -- reverse the bits in the bytes of a string
*
* ******************************************************************** */
void Fax::Reverse_Bytes(UCHAR *str, // string to reverse
int len) // length of string
{
while(len--) // while there are bytes..
{
*str = Reverse_Byte(*str); // .. reverse the bits
str++; // .. next byte
}
}
/* ********************************************************************
*
* Receive -- Receive a Facsimile transmission
*
* ******************************************************************** */
void Fax::Receive(char *faxname)
{
int rc = 0, // return code
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