/home/kapf/tycho_docu/big_endian_converter.c File Reference

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "variables_global.h"
#include "prototypes.h"

Go to the source code of this file.

Functions
long long int	ntohll (const long long int data)

---

Function Documentation

long long int ntohll

(

const long long int

data

)

converts double values to BigEndian VTK binaries are in BigEndian format as well as AMIRA MESH Files

Definition at line 21 of file big_endian_converter.c.

References x.

Referenced by write_amira(), write_ic_amira(), write_ic_vtk(), and write_vtk().

                                               {

    enum {
        TYP_INIT, TYP_SMLE, TYP_BIGE
    };

    union {
        long long int ull;
        uint8_t c[8];
    } x;

    // Test if on BigEndian machine
    static int typ = TYP_INIT;

    if (typ == TYP_INIT) {
        x.ull = 0x01;
        typ = (x.c[7] == 0x01) ? TYP_BIGE : TYP_SMLE;
    }

    // If system is BigEndian; return data as is.
    if (typ == TYP_BIGE) {
        return data;
    }

    // convert data to Big Endian
    x.ull = data;

    int8_t c = 0;
    c = x.c[0];
    x.c[0] = x.c[7];
    x.c[7] = c;
    c = x.c[1];
    x.c[1] = x.c[6];
    x.c[6] = c;
    c = x.c[2];
    x.c[2] = x.c[5];
    x.c[5] = c;
    c = x.c[3];
    x.c[3] = x.c[4];
    x.c[4] = c;

    return x.ull;
}