/* * sco2raw.c * * Author : Lionetti Salvatore <salvatorelionetti@yahoo.it> * License: GPL * * 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 */#include<fcntl.h>  /* open().*/#include<unistd.h> /* read()/close().*/#include<stdio.h>#include<stdlib.h> /* malloc().*//* We choice to print only entire frame.*/int readN(int fd, char* data, int len) {	int ritorno=0;	int l=0;	int nRetry=100;	while (ritorno>=0 && l<len && nRetry) {		ritorno=read(fd,data+l,len-l);		l+=ritorno;		if (ritorno>0)			nRetry=100;		else			nRetry--;	}	return ritorno<0?ritorno:l;}int main(int argc, char* argv[]) {	int ritorno;	char scoHandle[2];	int fd=0;		/* Get sco handle.*/	{		ritorno = -1;		fd=open("data.txt",O_RDONLY,0666);		if (fd>0) {			char handles[8];			if (read(fd,handles,8)==8) {				scoHandle[0]=handles[6];				scoHandle[1]=handles[7];				ritorno = 0;			}			close(fd);		}	}	fd=0;	if (argc>1) {		fd=open(argv[1],O_RDONLY,0666);		ritorno=(fd<=0);	}	/* Write sco format, assuming len=48.*/	if (ritorno == 0) {		/* 		 * Tipical frame:		 *  handle len		 *  2b  00  30 ... (48 bytes)		 */		/*		 *  1) Synchronize		 */		unsigned char header[3];		unsigned char* data=NULL;		unsigned char lenkm1=0;		int isSync=0;		ritorno = 1;		header[0]=header[1]=header[2]=0;				/* on 0 return, driver is ok.*/		while (ritorno>0 && (ritorno=readN(fd,(char*)header+!isSync,isSync+1))==(isSync+1)) {#if 0			unsigned char len=0; int l=0;			if ((ritorno=read(0,&len,1))==1)				while (ritorno>0 && l<len) {					ritorno=read(0,data+l,len-l);					if (ritorno>0)						l+=ritorno;				}#endif			isSync = (header[0]==scoHandle[0] && header[1]==scoHandle[1]);			if (isSync) {				if ((ritorno=read(fd,(char*)header+2,1))==1) {					unsigned char len=header[2];					if (lenkm1 && lenkm1!=len) ritorno=-1;					else {						if (!data) data=malloc(len);						lenkm1=len;						ritorno = readN(fd,(char*)data,len);					}					if (ritorno == len)						write(1,data,len);				}			} else				header[0]=header[1];		}		if (data) free(data);	}	fprintf(stderr,"ritorno(%d)",ritorno);	return ritorno;}