CITS3002 Computer Networks  
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Converting complex data structures

Example:

If we wished to XDR encode a structure of the form 

struct person {
    char    name[50];
    int     age;
    char    sex;
}

we could use the following XDR conversion function 

bool    xdr_person(XDR *xdrs, struct person *p)
{
        if(!xdr_string(xdrs, &p->name, 50))
                return false;
        if(!xdr_int(xdrs, &p->age))
                return false;
        if(!xdr_char(xdrs, &p->sex))
                return false;
        return true;
}

If we had an array of person structures, declared as 

struct person    world[200];

we could convert it using 

xdr_vector(xdrs, world, 200, sizeof(struct person), xdr_person);

The final parameter is the name of the function which is to be called to XDR encode each element of the array.

CITS3002 Computer Networks, Lecture 10, Architecture independent applications, p22, 8th May 2024.