tracker/readraw/readped.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 readped_(float *ped_buf, int *error, int *fd)*/
void getbytes_(int *nbytes, char *buffer, int *p, unsigned int *value);


void readped_(float *ped_buf, int *error,char *buffer, int *len,int *curpos)
/**************************************************************/

{
   
    int i;
    unsigned int decimals,units;
    unsigned int word;
    unsigned int ped_buf_temp[1024];
    
    *error=0;
/************************************************************
 *     20/9/2005 modified by david fedele                     */
 /*    int nread; */

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


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

    int nbytes2=2;
    char *buff=buffer;
    
    if( *curpos+(2*1024)-1>*len ) {
        printf("readped: Unexpected end of file\n");
        *error=1;
        return ;
    }
    
    for(i=0; i<1024; i++)
        getbytes_(&nbytes2,buff,curpos,&ped_buf_temp[i]);
    
    
/*****************************************************************/

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

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


//    for( i=0; i<1024; i++) printf("%x \n",ped_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 readped_(float ped_buf, int error, int fd)*/
20	void getbytes_(int nbytes, char buffer, int p, unsigned int value);
21
22
23	void readped_(float ped_buf, int error,char buffer, int len,int *curpos)
24	/**************************************************************/
25
26	{
27
28	int i;
29	unsigned int decimals,units;
30	unsigned int word;
31	unsigned int ped_buf_temp[1024];
32
33	*error=0;
34	/************************************************************
35	* 20/9/2005 modified by david fedele */
36	/* int nread; */
37
38	/* /\* read the buffer \/ /
39	/* nread=read(fd, ped_buf_temp, 21024); */
40	/* if( nread==0 ) { */
41	/* printf("readped: Unexpected end of file %d at %d \n",fd,nread); /
42	/* error=1; /
43	/* return ; */
44	/* } */
45	/* if ( nread != 21024) { /
46	/* printf("readped: Error on reading: nread = %d \n",nread); */
47	/* error=-1; /
48	/* return ; */
49	/* } */
50
51
52	/* /\* correct byte \/ //endianess... /
53	/* for(i=0; i<1024; i++) { */
54	/* word = ped_buf_temp[i]; */
55	/* ped_buf_temp[i] = ( (word&0x00ff) << 8 ) \| ( (word&0xff00) >> 8 ); */
56	/* } */
57
58	int nbytes2=2;
59	char *buff=buffer;
60
61	if( curpos+(21024)-1>*len ) {
62	printf("readped: Unexpected end of file\n");
63	*error=1;
64	return ;
65	}
66
67	for(i=0; i<1024; i++)
68	getbytes_(&nbytes2,buff,curpos,&ped_buf_temp[i]);
69
70
71	/*****************************************************************/
72
73	/**interpreta/
74	for(i=0; i<1024; i++) {
75
76	word = ped_buf_temp[i];
77	units = ( (word >> 4) & 0x0fff ) ;
78	decimals = (word & 0x000f) ;
79	ped_buf[i] = (float)units + (float)decimals / 16.;
80	// printf("%i %i %i %f \n",i,units,decimals,ped_buf[i]);
81	}
82
83
84	// for( i=0; i<1024; i++) printf("%x \n",ped_buf[i]);//???
85
86	return;
87	}