tracker/readraw/readsig.c

/************************************************************
*     20/9/2005 modified by david fedele to read buffer-data
*     instead raw-data-file 
**************************************************************
 * include needed system headers
 */
#include <stdio.h>       /* include standard i/o library */
#include <stdlib.h>      /* include standard library */
#include <string.h>      /* include string library */
#include <unistd.h>      /* include unix standard library */
#include <sys/types.h>   /* */
#include <sys/stat.h>    /* */
#include <fcntl.h>       /* */
#include <errno.h>       /* error simbol definitions */
#include <time.h>        /* system time definitions */
#include <math.h>        /* math library */
/************************************************************
 *     20/9/2005 modified by david fedele                     */
/* void readsig_(float *sig_buf, int *error, int *fd) */
void getbytes_(int *nbytes, char *buffer, int *p, unsigned int *value);


 void readsig_(float *sig_buf, int *error,char *buffer, int *len,int *curpos)
{
    int i;
    unsigned int word;
    unsigned int decimals,units;
    unsigned int sig_buf_temp[1024];
    

    *error=0;
/************************************************************
 *     20/9/2005 modified by david fedele                     */
 /*    int nread; */

/* /\*** read the buffer ***\/ */
/*     nread=read(*fd, sig_buf_temp, 2*1024); */
/*     if( nread==0 ) { */
/*      printf("readsig: Unexpected end of file %d at %d \n",*fd,nread); */
/*      *error=1; */
/*      return ; */
/*     } */
/*     if ( nread != 2*1024) { */
/*      printf("readsig: Error on reading: nread = %d \n",nread); */
/*      *error=-1; */
/*      return ;  */
/*     } */


/* /\*** correct byte ***\/ //endianess... */
/*     for(i=0; i<1024; i++) { */
/*      word = sig_buf_temp[i]; */
/*      sig_buf_temp[i] = ( (word&0x00ff) << 8 ) | ( (word&0xff00) >> 8 ); */
/*     } */

    int nbytes2=2;
    char *buff=buffer;

    if( *curpos+1024>*len ) {
        printf("readsig: Unexpected end of file \n");
        *error=1;
        return ;
    }
    
    for(i=0; i<1024; i++)
        getbytes_(&nbytes2,buff,curpos,&sig_buf_temp[i]);

/*****************************************************************/


    /***interpreta*/
    for(i=0; i<1024; i++) {

        word = sig_buf_temp[i];
        units = ( (word >> 4) & 0x0fff ) ;
        decimals = (word & 0x000f) ;
        sig_buf[i] = (float)units + (float)decimals / 16.;
//      printf("%i %i %i %f \n",i,units,decimals,sig_buf[i]);
    }


//    for( i=0; i<1024; i++) printf("%x \n",sig_buf[i]);//???

    return; 
}
1	/************************************************************
2	* 20/9/2005 modified by david fedele to read buffer-data
3	* instead raw-data-file
4	**************************************************************
5	* include needed system headers
6	*/
7	#include <stdio.h> /* include standard i/o library */
8	#include <stdlib.h> /* include standard library */
9	#include <string.h> /* include string library */
10	#include <unistd.h> /* include unix standard library */
11	#include <sys/types.h> /* */
12	#include <sys/stat.h> /* */
13	#include <fcntl.h> /* */
14	#include <errno.h> /* error simbol definitions */
15	#include <time.h> /* system time definitions */
16	#include <math.h> /* math library */
17	/************************************************************
18	* 20/9/2005 modified by david fedele */
19	/* void readsig_(float sig_buf, int error, int fd) /
20	void getbytes_(int nbytes, char buffer, int p, unsigned int value);
21
22
23	void readsig_(float sig_buf, int error,char buffer, int len,int *curpos)
24	{
25	int i;
26	unsigned int word;
27	unsigned int decimals,units;
28	unsigned int sig_buf_temp[1024];
29
30
31	*error=0;
32	/************************************************************
33	* 20/9/2005 modified by david fedele */
34	/* int nread; */
35
36	/* /\* read the buffer \/ /
37	/* nread=read(fd, sig_buf_temp, 21024); */
38	/* if( nread==0 ) { */
39	/* printf("readsig: Unexpected end of file %d at %d \n",fd,nread); /
40	/* error=1; /
41	/* return ; */
42	/* } */
43	/* if ( nread != 21024) { /
44	/* printf("readsig: Error on reading: nread = %d \n",nread); */
45	/* error=-1; /
46	/* return ; */
47	/* } */
48
49
50	/* /\* correct byte \/ //endianess... /
51	/* for(i=0; i<1024; i++) { */
52	/* word = sig_buf_temp[i]; */
53	/* sig_buf_temp[i] = ( (word&0x00ff) << 8 ) \| ( (word&0xff00) >> 8 ); */
54	/* } */
55
56	int nbytes2=2;
57	char *buff=buffer;
58
59	if( curpos+1024>len ) {
60	printf("readsig: Unexpected end of file \n");
61	*error=1;
62	return ;
63	}
64
65	for(i=0; i<1024; i++)
66	getbytes_(&nbytes2,buff,curpos,&sig_buf_temp[i]);
67
68	/*****************************************************************/
69
70
71	/**interpreta/
72	for(i=0; i<1024; i++) {
73
74	word = sig_buf_temp[i];
75	units = ( (word >> 4) & 0x0fff ) ;
76	decimals = (word & 0x000f) ;
77	sig_buf[i] = (float)units + (float)decimals / 16.;
78	// printf("%i %i %i %f \n",i,units,decimals,sig_buf[i]);
79	}
80
81
82
83	// for( i=0; i<1024; i++) printf("%x \n",sig_buf[i]);//???
84
85	return;
86	}