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d4lib.c
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d4lib.c
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/* d4lib.c
* Copyright (C) 2001 Jean-Jacques Sarton jj.sarton@t-online.de
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* this file will be a library, which will allow to use the EPSON
* Stylus Scanner and also allow to send commands to the
* Stylus Color 480/580.
*
* At this stage a lot of things are not implemented and the
* first goal is to get the Stylus Scanner printing.
* This may be reached if this file is compiled with the TEST
* option set.
*
* I don´t own a Stylus Scanner and I am not able to test this
* code, as desired. Printing on a Stylus Photo 1290 work fine
* with this.
*
* The best way to get the Stylus Scanner working is to test
* this and also correct my possibly errors.
* Programming knowledge will be helpfull for this.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include "d4lib.h"
#ifndef RDTIMEOUT
#define RDTIMEOUT 10000
#define WRTIMEOUT 10000
#endif
int d4WrTimeout = WRTIMEOUT;
int d4RdTimeout = RDTIMEOUT;
int ppid = 0;
int debugD4 = 1;
typedef void (*signalHandler_t)(int);
static signalHandler_t sig;
static int timeoutGot = 0;
static int _readData(int fd, unsigned char *buf, int len);
/* commands for the D4 protocol
Transaction Cmd Reply
-------------- ---- -----
Init 0x00 0x80
OpenChannel 0x01 0x81
CloseChannel 0x02 0x82
Credit 0x03 0x83
CreditRequest 0x04 0x84
Exit 0x08 0x88
GetSocketID 0x09 0x89
GetServiceName 0x0a 0x8a
Error 0x7f -
*/
typedef struct cmdHeader_s
{
unsigned char psid;
unsigned char ssid;
unsigned char lengthH;
unsigned char lengthL;
unsigned char credit;
unsigned char control;
unsigned char command;
} cmdHeader_t;
typedef struct replyHeader_s
{
unsigned char psid;
unsigned char ssid;
unsigned char lengthH;
unsigned char lengthL;
unsigned char credit;
unsigned char control;
unsigned char command;
unsigned char result;
} replyHeader_t;
typedef struct init_s
{
cmdHeader_t head;
unsigned char revision;
} init_t;
typedef struct initReply_s
{
replyHeader_t head;
unsigned char revision;
} initReply_t;
typedef struct error_s
{
replyHeader_t head;
unsigned char epsid;
unsigned char essid;
unsigned char ecode;
} error_t;
/* results */
typedef struct errorMessage_s
{
unsigned char result;
const char *message;
int errorClass;
} errorMessage_t;
#define RECOVERABLE 0
#define FATAL 1
static errorMessage_t errorMessage[] =
{
{ 0x01, "Unable to begin conversation, try later." ,0 },
{ 0x02, "Protocol revision not supported." ,1 },
{ 0x03, "Transaction channel can´t be closed." ,0 },
{ 0x04, "No sufficient resources available now." ,0 },
{ 0x05, "Connection denied." ,1 },
{ 0x06, "Channel allready open." ,0 },
{ 0x07, "Credit overflow, previous credit remain valid." ,0 },
{ 0x08, "Channel is not open." ,1 },
{ 0x09, "Service not available on specified socket." ,1 },
{ 0x0a, "Service name to socket ID failed." ,1 },
{ 0x0b, "Init transaction failed." ,1 },
{ 0x0c, "Invalid packet size." ,1 },
{ 0x0d, "Requested packed size is 0, no data can be transfered.",0 },
{ 0x80, "Malformed packet, ignored." ,1 },
{ 0x81, "No credit for received packet, ignored" ,0 },
{ 0x82, "Reply don´t match with outstanding command, ignored." ,1 },
{ 0x83, "Packet size greater as negotiated size." ,1 },
{ 0x84, "Data received for a non opened channel." ,1 },
{ 0x85, "Reply with unknown result value received." ,1 },
{ 0x86, "Piggybacked credit in data packet cause overflow." ,1 },
{ 0x87, "Unknown 1284.4 Reply." ,0 },
{ 0x00, NULL ,0 }
};
#define RESET_TIMER(ti,oti) { signal(SIGALRM, sig); \
memset((void*)&ti,0,sizeof(ti)); \
memset((void*)&oti,0,sizeof(oti)); \
setitimer( ITIMER_REAL ,&ti, &oti); \
}
#define SET_TIMER(ti,oti,val) { memset((void*)&ti,0,sizeof(ti)); \
memset((void*)&oti,0,sizeof(oti)); \
ti.it_value.tv_sec = val/1000; \
ti.it_value.tv_usec = (val%1000)*1000; \
setitimer( ITIMER_REAL ,&ti, &oti); \
sig = signal(SIGALRM, sigAlarm); \
}
/*******************************************************************/
/* Function printHexValues */
/* */
/* Print hex code contained in the passed buffer */
/* */
/*******************************************************************/
static void printHexValues(const char *dir, const unsigned char *buf, int len)
{
int i, j;
int printable_count = 0;
int longest_printable_run = 0;
int current_printable_run = 0;
int print_strings = 0;
int blocks = (len + 15) / 16;
#if 0
len = len > 30 ? 30 : len;
#endif
fprintf(stderr,"%s\n",dir);
for (i = 0; i < len; i++)
{
if (isprint(buf[i]))
{
if (!isspace(buf[i]))
printable_count++;
current_printable_run++;
}
else
{
if (current_printable_run > longest_printable_run)
longest_printable_run = current_printable_run;
}
}
if (current_printable_run > longest_printable_run)
longest_printable_run = current_printable_run;
if (longest_printable_run >= 8 ||
((float) printable_count / (float) len > .75))
print_strings = 1;
if (print_strings)
{
for (i = 0; i < len; i++)
{
fprintf(stderr,"%c",isprint(buf[i])||isspace(buf[i])?buf[i]:'*');
if (buf[i] == ';' && i < len - 1)
fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
}
for (j = 0; j < blocks; j++)
{
int baseidx = j * 16;
int count = len;
if (count > baseidx + 16)
count = baseidx + 16;
fprintf(stderr, "%4d: ", baseidx);
for ( i = baseidx; i < count;i++)
{
if (i % 4 == 0)
fprintf(stderr, " ");
fprintf(stderr," %02x",buf[i]);
}
if (print_strings)
{
fprintf(stderr,"\n ");
for ( i = baseidx; i < count;i++)
{
if (i % 4 == 0)
fprintf(stderr, " ");
fprintf(stderr," %c",
isprint(buf[i]) && !isspace(buf[i]) ? buf[i] : ' ');
}
}
fprintf(stderr, "\n");
}
}
int SafeWrite(int fd, const void *data, int len)
{
int status;
int retries=30;
if (debugD4)
printHexValues("SafeWrite: ", data, len);
do
{
status = write(fd, data, len);
if(status < len)
usleep(d4WrTimeout);
retries--;
}
while ((status < len) && (retries > 0));
return(status);
}
/*******************************************************************/
/* Function sigAlarm(int code) */
/* */
/* do nothing, avoid printing of undesired messages and/or */
/* other not desirable actions */
/* */
/*******************************************************************/
static void sigAlarm(int code)
{
timeoutGot = -1;
}
/*******************************************************************/
/* Function printError() */
/* print an error message on stderr */
/* */
/* Input: unsigned char errorNb the error number */
/* */
/* Return: fatal = 1 or recoverable = 0 */
/* */
/*******************************************************************/
static int printError(unsigned char errorNb)
{
errorMessage_t *msg = errorMessage;
if ( errorNb == 0 )
{
return 0;
}
while ( msg->result )
{
if ( msg->result == errorNb )
{
fprintf(stderr,"%s\n", msg->message);
return msg->errorClass;
}
msg++;
}
fprintf(stderr,"Unknown IEEE 1284.4 error number %d\n",errorNb);
return 1; /* non recoverable error */
}
/*******************************************************************/
/* Function printCmdType() */
/* print on stderr the command name */
/* Input: unsigned char *cmd the data are to be put here */
/* */
/* Return: - */
/* */
/*******************************************************************/
static void printCmdType(unsigned char *cmd)
{
if ( cmd[0] == 0 && cmd[1] == 0 )
{
switch(cmd[6])
{
case 0: fprintf(stderr,"--- Init ---\n");break;
case 1: fprintf(stderr,"--- OpenChannel ---\n");break;
case 2: fprintf(stderr,"--- CloseChannel ---\n");break;
case 3: fprintf(stderr,"--- Credit ---\n");break;
case 4: fprintf(stderr,"--- CreditRequest ---\n");break;
case 8: fprintf(stderr,"--- Exit ---\n");break;
case 9: fprintf(stderr,"--- GetSocketID ---\n");break;
case 10: fprintf(stderr,"--- GetServiceName ---\n");break;
case 0x45: fprintf(stderr,"--- EnterD4Mode ---\n");break;
case 0x7f: fprintf(stderr,"--- Error ---\n");break;
default: fprintf(stderr,"--- ?????????????? ---\n");break;
}
}
else
{
fprintf(stderr,"--- Send Data ---\n");
}
}
/*******************************************************************/
/* Function writeCmd() */
/* write a commmand */
/* Input: int fd file handle */
/* char *cmd the data are to be put here */
/* int len the number of bytes to read */
/* */
/* Return: number of bytes write or -1 */
/* */
/*******************************************************************/
static int writeCmd(int fd, unsigned char *cmd, int len)
{
int w;
int i = 0;
struct itimerval ti, oti;
# if PTIME
struct timeval beg, end;
long dt;
# endif
if ( debugD4 )
{
printCmdType(cmd);
# if PTIME
gettimeofday(&beg, NULL);
# endif
if ( cmd[0] == 0 && cmd[1] == 0 )
{
printHexValues("Send: ", cmd, len);
}
else
{
printHexValues("Send: ", cmd, 6);
}
}
usleep(1); /* according to Glen Steward, this will solve problems */
/* for the cartridge exchange with the Stylus Color 580 */
timeoutGot = 0;
errno = 0;
while ( i < len )
{
SET_TIMER(ti,oti,d4WrTimeout);
w = SafeWrite(fd, cmd+i,len-i);
RESET_TIMER(ti,oti);
if ( w < 0 )
{
if ( debugD4 )
{
perror("Write error");
}
i= -1;
break;
}
else
i += w;
}
if ( debugD4 )
{
# if PTIME
gettimeofday(&end, NULL);
dt = (end.tv_sec - beg.tv_sec) * 1000000;
dt += end.tv_usec - beg.tv_usec;
fprintf(stderr,"Write time %5.3f s\n",(double)dt/1000000);
# endif
}
if ( timeoutGot )
return -1;
return i;
}
/*******************************************************************/
/* Function readAnswer() */
/* Read the datas returned by the printer */
/* Input: int fd file handle */
/* char *buf the data are to be put here */
/* int len the number of bytes to read */
/* */
/* Return: number of bytes read. -1 on error */
/* */
/*******************************************************************/
int readAnswer(int fd, unsigned char *buf, int len)
{
int rd = 0;
int total = 0;
struct timeval beg, end;
struct itimerval ti, oti;
long dt;
int count = 0;
int first_read = 1;
/* wait a little bit before reading an answer */
usleep(d4RdTimeout);
/* for error handling in case of timeout */
timeoutGot = 0;
/* set errno to 0 in order to get correct informations */
/* in case of error */
errno = 0;
gettimeofday(&beg, NULL);
if (debugD4)
fprintf(stderr, "length: %i\n", len);
while ( total < len )
{
SET_TIMER(ti,oti, d4RdTimeout);
rd = read(fd, buf+total, len-total);
if (debugD4)
{
if (first_read)
{
fprintf(stderr, "read: ");
first_read = 0;
}
if (rd < 0)
{
fprintf(stderr, "%i %s\n", rd, errno != 0 ?strerror(errno) : "");
first_read = 1;
}
else
fprintf(stderr, "%i ", rd);
}
RESET_TIMER(ti,oti);
if ( rd <= 0 )
{
gettimeofday(&end, NULL);
dt = (end.tv_sec - beg.tv_sec) * 1000;
dt += (end.tv_usec - beg.tv_usec) / 1000;
if ( dt > d4RdTimeout * 2 )
{
if ( debugD4 )
fprintf(stderr,"Timeout 1 at readAnswer() rcv %d bytes\n",total);
timeoutGot = 1;
break;
}
count++;
if ( count >= 100 )
{
timeoutGot = 1;
if ( rd == 0 )
errno = -1; /* tell that there is an abnormal condition */
break;
}
errno = 0;
} else {
total += rd;
if ( total > 3 )
{
/* the bytes idx 2 and 3 contain the length */
/* in case of errors this may differ from */
/* the expected lenght. Setting len to this */
/* value will avoid waiting for timeout */
len = (buf[2] << 8) + buf[3];
len = (len > sizeof(buf))?sizeof(buf) - 1:len;
}
}
usleep(d4RdTimeout);
}
if ( debugD4 )
{
# if PTIME
gettimeofday(&end, NULL);
# endif
fprintf(stderr, "total: %i\n", total);
printHexValues("Recv: ",buf,total);
# if PTIME
dt = (end.tv_sec - beg.tv_sec) * 1000000;
dt += end.tv_usec - beg.tv_usec;
fprintf(stderr,"Read time %5.3f s\n",(double)dt/1000000);
# endif
}
if ( timeoutGot )
{
if ( debugD4 )
fprintf(stderr,"Timeout 2 at readAnswer()\n");
return -1;
}
return total;
}
static void _flushData(int fd)
{
int rd = 0;
struct itimerval ti, oti;
char buf[1024];
int len = 1023;
int count = 200;
usleep(d4RdTimeout);
/* for error handling in case of timeout */
timeoutGot = 0;
/* set errno to 0 in order to get correct informations */
/* in case of error */
errno = 0;
if (debugD4)
fprintf(stderr, "flush data: length: %i\n", len);
do
{
usleep(d4RdTimeout);
SET_TIMER(ti,oti, d4RdTimeout);
rd = read(fd, buf, len);
if (debugD4)
fprintf(stderr, "flush: read: %i %s\n", rd,
rd < 0 && errno != 0 ?strerror(errno) : "");
RESET_TIMER(ti,oti);
count--;
} while ( count > 0 && (rd > 0 || (rd < 0 && errno == EAGAIN)));
}
/*******************************************************************/
/* Function _readData() */
/* Read the datas returned by the printer */
/* Input: int fd file handle */
/* char *buf the data are to be put here */
/* int len the number of bytes to read */
/* */
/* Return: number of bytes read. -1 on error */
/* */
/*******************************************************************/
static int _readData(int fd, unsigned char *buf, int len)
{
int rd = 0;
int total = 0;
int toGet = 0;
unsigned char header[6];
struct timeval beg, end;
long dt;
struct itimerval ti, oti;
/* set errno to 0 in order to get correct informations */
/* in case of error */
errno = 0;
/* read the first 6 bytes */
gettimeofday(&beg, NULL);
while ( total < 6 )
{
SET_TIMER(ti,oti, d4RdTimeout);
rd = read(fd, header+total, 6-total);
RESET_TIMER(ti,oti);
if ( rd <= 0 )
{
gettimeofday(&end, NULL);
dt = (end.tv_sec - beg.tv_sec) * 1000;
dt += (end.tv_usec - beg.tv_usec) / 1000;
if ( dt > d4RdTimeout*3 )
{
if ( debugD4 )
fprintf(stderr,"Timeout at _readData(), dt = %ld ms\n", dt);
return -1;
break;
}
continue;
}
else
{
total += rd;
}
}
if ( debugD4 )
printHexValues("Recv: ",header,total);
if ( total == 6 )
{
toGet = (header[2] >> 8) + header[3] - 6;
if (debugD4)
fprintf(stderr, "toGet: %i\n", toGet);
if (toGet > len)
return -1;
total = 0;
gettimeofday(&beg, NULL);
while ( total < toGet )
{
SET_TIMER(ti,oti, d4RdTimeout);
rd = read(fd, buf+total, toGet-total);
RESET_TIMER(ti,oti);
if ( rd <= 0 )
{
gettimeofday(&end, NULL);
dt = (end.tv_sec - beg.tv_sec) * 1000;
dt += (end.tv_usec - beg.tv_usec) / 1000;
if ( dt > d4RdTimeout*3 )
{
if ( debugD4 )
fprintf(stderr,"Timeout at _readData(), dt = %ld ms\n",dt);
return -1;
break;
}
continue;
}
else
{
total += rd;
}
}
if ( debugD4 )
printHexValues("Recv: ",buf,total);
return total;
}
return -1;
}
/*******************************************************************/
/* Function sendReceiveCmd() */
/* send a command and get the answer. */
/* Input: int fd file handle */
/* char *buf the data are to be put here */
/* int len the number of bytes to read */
/* */
/* Return: number of bytes read */
/* */
/*******************************************************************/
static int sendReceiveCmd(int fd, unsigned char *cmd, int len, unsigned char *answer, int expectedlen)
{
int rd;
if ( (rd = writeCmd(fd, cmd, len ) ) != len )
{
if ( rd < 0 ) return -1;
return 0;
}
rd = readAnswer(fd, answer, expectedlen );
if ( rd == 0 )
{
/* no answer from device */
return 0;
}
else if ( rd < 0 )
{
/* interrupted write call */
if ( debugD4 )
fprintf(stderr,"interrupt received\n");
return -1;
}
else
{
/* check result */
if ( answer[6] == 0x7f )
{
printError(answer[9]);
return -1;
}
else if ( answer[7] != 0 )
{
if ( printError(answer[7]) )
{
return -1;
}
return 0;
}
else
{
return rd;
}
}
}
/*******************************************************************/
/* Function EnterIEEE() */
/* send a command and get the answer. */
/* Input: int fd file handle */
/* */
/* Return: 0 on error 1 if all is OK */
/* */
/*******************************************************************/
int EnterIEEE(int fd)
{
unsigned char buf[200];
unsigned char cmd[] =
{
0x00, 0x00, 0x00, 0x1b, 0x01, '@', 'E', 'J', 'L', ' ',
'1', '2', '8', '4', '.', '4', 0x0a, '@', 'E', 'J',
'L', 0x0a, '@', 'E', 'J', 'L', 0x0a
};
int rd;
memset(buf, 0, sizeof(buf));
Loop:
if ( writeCmd(fd, cmd, sizeof(cmd) ) != sizeof(cmd) )
{
return 0;
}
rd = readAnswer(fd, buf, 8);
if ( rd == 0 )
{
/* no answer from device */
return 0;
}
else if ( rd < 0 )
{
/* interrupted write call */
return 0;
}
else
{
int i;
/* check result */
for (i=0; i < rd; i++ )
if ( buf[i] != 0 )
break;
if ( i == rd ) goto Loop;
return 1;
}
}
/*******************************************************************/
/* Function Init() */
/* handle the init command */
/* Input: int fd file handle */
/* */
/* Return: 0 on error 1 if all is OK */
/* */
/*******************************************************************/
int Init(int fd)
{
unsigned char buf[20];
init_t cmd;
int rd;
cmd.head.psid = 0;
cmd.head.ssid = 0;
cmd.head.lengthH = 0;
cmd.head.lengthL = 8;
cmd.head.credit = 1;
cmd.head.control = 0;
cmd.head.command = 0;
cmd.revision = 0x10;
rd = sendReceiveCmd(fd, (unsigned char*)&cmd, sizeof(cmd), buf, 9 );
return rd == 9 ? 1 : 0;
}
/*******************************************************************/
/* Function Exit() */
/* handle the Exit command */
/* Input: int fd file handle */
/* */
/* Return: 0 on error 1 if all is OK */
/* */
/*******************************************************************/
int Exit(int fd)
{
int rd;
unsigned char buf[20];
cmdHeader_t cmd;
cmd.psid = 0;
cmd.ssid = 0;
cmd.lengthH = 0;
cmd.lengthL = 7;
cmd.credit = 1;
cmd.control = 0;
cmd.command = 8;
rd = sendReceiveCmd(fd, (unsigned char*)&cmd, sizeof(cmd), buf, 8 );
return rd > 0 ? 1 : rd;
}
/*******************************************************************/
/* Function GetSocketID() */
/* handle the GetSocketID command */
/* Input: int fd file handle */
/* char *serviceName name of wanted service */
/* */
/* Return: 0 on error else the socket ID */
/* */
/*******************************************************************/
int GetSocketID(int fd, const char *serviceName)
{
/* the service name may not be longer as 40 bytes */
int len = sizeof(cmdHeader_t) + strlen(serviceName);
char buf[100];
unsigned char rBuf[100];
int rd;
cmdHeader_t *cmd = (cmdHeader_t*)buf;
cmd->psid = 0;
cmd->ssid = 0;
cmd->lengthH = 0;
cmd->lengthL = len & 0xff;
cmd->credit = 1;
cmd->control = 0;
cmd->command = 0x09;
strcpy(buf + sizeof(cmdHeader_t), serviceName);
rd = sendReceiveCmd(fd, (unsigned char*)buf, len, rBuf, len + 2);
if ( rd > 0 )
{
return rBuf[8];
}
else
{
return 0;
}
}
/*******************************************************************/
/* Function OpenChannel() */
/* handle the OpenChannel command */
/* Input: int fd file handle */
/* I/O: int *sndSz The size for sendig of datas */
/* int *recSz The size for receiving of datas */
/* */
/* Return: -1 on error or 1 if all is OK */
/* */
/*******************************************************************/
int OpenChannel(int fd, unsigned char sockId, int *sndSz, int *rcvSz)
{
unsigned char cmd[17];
unsigned char buf[20];
int rd;
for(;;)
{
cmd[0] = 0; /* transaction sockets */
cmd[1] = 0;
cmd[2] = 0; /* len */
cmd[3] = 17; /* len */
cmd[4] = 1; /* credit */
cmd[5] = 0; /* control */
cmd[6] = 1; /* command */
cmd[7] = sockId; /* sockets # */
cmd[8] = sockId; /* sockets # */
cmd[9] = *sndSz >> 8; /* packet size in send dir */
cmd[10] = *sndSz & 0xff;
cmd[11] = *rcvSz >> 8; /* packet size in recv dir */
cmd[12] = *rcvSz & 0xff;
cmd[13] = 0; /* max outstanding Credit, must be 0 */
cmd[14] = 0;
cmd[15] = 0; /* initial credit for us ? */
cmd[16] = 0;
rd = sendReceiveCmd(fd, cmd, 17, buf, 16);
if ( rd == -1 )
{
return -1;
}
else if ( rd == 16 )
{
if ( buf[7] == 4 )
{
/* device can´t allocate resources now */
continue;
}
else if ( buf[7] != 0 )
{
/* hard error */
return -1;
}
*sndSz = (buf[10]<<8) + buf[11];
*rcvSz = (buf[12]<<8) + buf[13];
break;
}
else
{
/* at this stage we can only have an error */
return -1;
}
}
return 1;
}
/*******************************************************************/
/* Function CloseChannel() */
/* handle the CloseChannel command */
/* Input: int fd file handle */
/* unsigned char socketID he socket to close */
/* */
/* Return: -1 on error or 1 if all is OK */
/* */
/*******************************************************************/
int CloseChannel(int fd, unsigned char socketID)
{
unsigned char buf[100];
int rd;
cmdHeader_t *cmd = (cmdHeader_t *)buf;
cmd->psid = 0;
cmd->ssid = 0;
cmd->lengthH = 0;
cmd->lengthL = 10;
cmd->credit = 1;
cmd->control = 0;
cmd->command = 2;
buf[sizeof(cmdHeader_t)+0] = socketID;
buf[sizeof(cmdHeader_t)+1] = socketID;
buf[sizeof(cmdHeader_t)+2] = 0;
rd = sendReceiveCmd(fd, buf,10, buf, 10);
return rd == 10 ? 1 : rd;
}
/*******************************************************************/
/* Function CreditRequest() */
/* handle the CreditRequest command */
/* Input: int fd file handle */
/* unsigned char socketID he socket to close */
/* */
/* Return: -1 on error else the credit got */
/* */
/*******************************************************************/
int CreditRequest(int fd, unsigned char socketID)
{
int rd;
unsigned char buf[100];
unsigned char rBuf[100];
cmdHeader_t *cmd = (cmdHeader_t *)buf;
cmd->psid = 0;
cmd->ssid = 0;
cmd->lengthH = 0;
cmd->lengthL = 13;
cmd->credit = 1;
cmd->control = 0;
cmd->command = 4;
buf[sizeof(cmdHeader_t)+0] = socketID;
buf[sizeof(cmdHeader_t)+1] = socketID;
buf[sizeof(cmdHeader_t)+2] = 0x00;
buf[sizeof(cmdHeader_t)+3] = 0x80;
buf[sizeof(cmdHeader_t)+4] = 0xff;
buf[sizeof(cmdHeader_t)+5] = 0xff;
rd = sendReceiveCmd(fd, buf, 13, rBuf, 12);
if ( rd == 12 )
{
/* this is the credit */
return (rBuf[10]*256)+rBuf[11];
}
else
{
return rd > 0 ? 0 : rd; /* there was an error */
}
}
/*******************************************************************/
/* Function Credit() */