source/readraw/findstart.c

/************************************************************
*     11/9/2005 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 */

/*   looks for a DSP header beginning (a word beginning with 1110)   */

/************************************************************
*     11/9/2005 modified by david fedele
*       void findstart_(int *error, int *fd)*/
void getbytes_(int *nbytes, char *buffer, int *p, unsigned int *value);

void findstart_(int *error,char *buffer, int *len, int *curpos)
{
    char *buff=buffer;
    int nbytes2=2;
    /* int nread */
/*     unsigned short word; */
/*     unsigned short temp; */
    unsigned int word;
/***********************************************************/
    
    *error=0;
    do {
/************************************************************/
/*     11/9/2005 modified by david fedele                   */
/*        nread=read(*fd, &word, 2); //reads 16 bits        */
/*      if(nread == 0) { */
/* //       printf("findstart: Unexpected end of file %d at %d \n",*fd,nread); */
/*          *error=1; */
/*          return ; */
/*      } */
/*      if(nread != 2) { */
/* //       printf("findstart: Error on reading: bytes read -> nread = %d \n",nread); */
/*          *error=-1; */
/*          return ; */
/*      } */

/*      /\*** corrects byte ***\/ //endianess... */
/*      temp = word; */
/*      word = ( (temp&0x00ff) << 8 ) | ( (temp&0xff00) >> 8 ); */
/* //   printf("word %x , temp: %x: \n", word, temp);//???  */

/*         /\*** goes back 8 bits ***\/ */
/*      lseek(*fd, -1, SEEK_CUR); //SEEK_CUR ---> from current position */

/* //   unsigned short num=lseek(*fd, -1, SEEK_CUR); //SEEK_CUR ---> from current position */
/* //   printf("%i \n",num); */
     
        getbytes_(&nbytes2,buff,curpos,&word);
           
      *curpos=*curpos-1;
      if(*curpos-1 > *len) {
/*      printf("findstart: Unexpected end of file \n"); */
            *error=1;
            return ;
        }
/***********************************************************/
  
    }     while ((word&0xf000) != 0xe000);
    
/************************************************************/
/*     11/9/2005 modified by david fedele                   */
/*     /\*** goes back 8 bits ***\/ */
/*     lseek(*fd, -1, SEEK_CUR); */
    *curpos=*curpos-1;
    
/************************************************************/
    return;
}
1	pam-fi	1.1	/************************************************************
2			* 11/9/2005 modified by david fedele to read buffer-data
3			* instead raw-data-file
4			**************************************************************
5
6			* include needed system headers
7			*/
8			#include <stdio.h> /* include standard i/o library */
9			#include <stdlib.h> /* include standard library */
10			#include <string.h> /* include string library */
11			#include <unistd.h> /* include unix standard library */
12			#include <sys/types.h> /* */
13			#include <sys/stat.h> /* */
14			#include <fcntl.h> /* */
15			#include <errno.h> /* error simbol definitions */
16			#include <time.h> /* system time definitions */
17			#include <math.h> /* math library */
18
19			/* looks for a DSP header beginning (a word beginning with 1110) */
20
21			/************************************************************
22			* 11/9/2005 modified by david fedele
23			* void findstart_(int error, int fd)*/
24			void getbytes_(int nbytes, char buffer, int p, unsigned int value);
25
26			void findstart_(int error,char buffer, int len, int curpos)
27			{
28			char *buff=buffer;
29			int nbytes2=2;
30			/* int nread */
31			/* unsigned short word; */
32			/* unsigned short temp; */
33			unsigned int word;
34			/***********************************************************/
35
36			*error=0;
37			do {
38			/************************************************************/
39			/* 11/9/2005 modified by david fedele */
40			/* nread=read(fd, &word, 2); //reads 16 bits /
41			/* if(nread == 0) { */
42			/* // printf("findstart: Unexpected end of file %d at %d \n",fd,nread); /
43			/* error=1; /
44			/* return ; */
45			/* } */
46			/* if(nread != 2) { */
47			/* // printf("findstart: Error on reading: bytes read -> nread = %d \n",nread); */
48			/* error=-1; /
49			/* return ; */
50			/* } */
51
52			/* /\* corrects byte \/ //endianess... /
53			/* temp = word; */
54			/* word = ( (temp&0x00ff) << 8 ) \| ( (temp&0xff00) >> 8 ); */
55			/* // printf("word %x , temp: %x: \n", word, temp);//??? */
56
57			/* /\* goes back 8 bits \/ /
58			/* lseek(fd, -1, SEEK_CUR); //SEEK_CUR ---> from current position /
59
60			/* // unsigned short num=lseek(fd, -1, SEEK_CUR); //SEEK_CUR ---> from current position /
61			/* // printf("%i \n",num); */
62
63			getbytes_(&nbytes2,buff,curpos,&word);
64
65			curpos=curpos-1;
66			if(curpos-1 > len) {
67			/* printf("findstart: Unexpected end of file \n"); */
68			*error=1;
69			return ;
70			}
71			/***********************************************************/
72
73			} while ((word&0xf000) != 0xe000);
74
75			/************************************************************/
76			/* 11/9/2005 modified by david fedele */
77			/* /\* goes back 8 bits \/ /
78			/* lseek(fd, -1, SEEK_CUR); /
79			curpos=curpos-1;
80
81			/************************************************************/
82			return;
83			}