/************************************************************
*     12/9/2005 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 */
/************************************************************
*     12/9/2005 modified by david fedele
void hunpacker_(unsigned short *buffer, int *error, int *fd)*/
void getbytes_(int *nbytes, char *buffer, int *p, unsigned int *value);
void hunpacker_(unsigned short *header, int *error,char *buffer, int *len,int *curpos,int *startcrc)
/************************************************************/
{

    int i;
    int nhead;
    unsigned int buffer_temp[13], *oo, *oi, *o1; //packed mode
/************************************************************
 *     12/9/2005 modified by david fedele                    */
/*     int nread,nhead; */
/*     unsigned short word; */

/* ///\*** goes back a word***\/ */
/* //    lseek(*fd, -2, SEEK_CUR); //SEEK_CUR ---> from current position */
       
/*     *error=0; */

/* /\*** read the buffer ***\/ */
/*     nhead = 13;  /\* packed *\/ */
/*     nread=read(*fd, buffer_temp, 2*nhead); */
/*     if( nread==0 ) { */
/* 	printf("hunpacker: Unexpected end of file %d at %d \n",*fd,nread); */
/* 	*error=1; */
/* 	return ; */
/*     } */
/*     if ( nread != 2*nhead) { */
/* 	printf("hunpacker: Error on reading: nread = %d \n",nread); */
/* 	*error=-1; */
/*  	return ;  */
/*     } */

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

    unsigned int word[16];
    int nbytes2=2;
    char *buff=buffer;
    *error=0;
/*** read the buffer ***/
    nhead = 13;  /* packed */
    
    *startcrc=*curpos;
    
    if( *curpos+(2*13)-1>*len ) {
	//	printf("hunpacker: Unexpected end of file\n");
	*error=1;
	return ;
    }
    
    for (i=0;i<13;i++)
	getbytes_(&nbytes2,buff,curpos,&buffer_temp[i]);
     	
/****************************************************************/




/*** buffer unpacking ***/
    if( nhead == 16 ) {                    //              NO!???
/************************************************************
 *     12/9/2005 modified by david fedele                    */
/* 	oo=buffer; /\* nopacking buffer *\/ */
        oo=word;
/**********************************************************/
	oi=buffer_temp;
	for( i=0; i<nhead; i++) *oo++ = *oi++;
    }
    if( nhead == 13 ) {
/************************************************************
 *     12/9/2005 modified by david fedele                    */
/* 	oo=buffer; /\* unpacking buffer *\/ */
        oo=word;
/**********************************************************/
	oi=buffer_temp;
	o1 = oi++;
	*oo++ = (*o1 & 0xfff8) >> 3;
	*oo++ = ( (*o1 & 0x0007) << 10 ) | ( (*oi & 0xffc0) >> 6); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x003f) << 7 ) | ( (*oi & 0xfe00) >> 9); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x01ff) << 4 ) | ( (*oi & 0xf000) >> 12); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x0fff) << 1 ) | ( (*oi & 0x8000) >> 15); 
	*oo++ = (*oi & 0x7ffc) >> 2;
	o1 = oi++;
	*oo++ = ( (*o1 & 0x0003) << 11 ) | ( (*oi & 0xffe0) >> 5); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x001f) << 8 ) | ( (*oi & 0xff00) >> 8); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x00ff) << 5 ) | ( (*oi & 0xf800) >> 11); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x07ff) << 2 ) | ( (*oi & 0xc000) >> 14); 
	*oo++ = (*oi & 0x3ffe) >> 1;
	o1 = oi++;
	*oo++ = ( (*o1 & 0x0001) << 12 ) | ( (*oi & 0xfff0) >> 4); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x000f) << 9 ) | ( (*oi & 0xff80) >> 7); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x007f) << 6 ) | ( (*oi & 0xfc00) >> 10); 
	o1 = oi++;
	*oo++ = ( (*o1 & 0x03ff) << 3 ) | ( (*oi & 0xe000) >> 13); 
	*oo++ = *oi++ & 0x1fff;
    }    

/************************************************************
 *     23/9/2005 modified by david fedele                    */
    for( i=0; i<16; i++) {
      header[i]=word[i];
/*       printf("%x \n",word[i]);//??? */
/*       printf("%x \n",header[i]);//??? */
    }
/**************************************************************/
    return; 
}