/*
 * @(#)FileIOTest.C 0.1 1999/09/10
 *
 * Copyright 1999 by Yoon Kyung Koo.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information
 * of Yoon Kyung Koo. ("Confidential Information").  You
 * shall not disclose such Confidential Information and shall use
 * it only in accordance with the terms of the license agreement
 * you entered into with Yoon Kyung Koo.
 *
 */
/**
 * This program provides a test over
 * communication with java apps
 *
 * @version 0.1 1999/09/10
 * @author <A HREF="mailto:yoonforh@yahoo.com">Yoon Kyung Koo</A>
 */

#include <iostream>
#include <fstream>

extern "C" {
#include <arpa/inet.h>
}

typedef struct {
    char bytes[100];
    char c;
    bool val; // usually bool type is defined as int, but it depends on O/S
    int str_length; // length of string
    char * string; // string bytes
} Object ;

void usage(const char * name) {
    cout << "\nUsage : " << name << " file1" << endl;
}

int main(int argc, char ** argv)
{
    if (argc < 2) {
	usage(argv[0]);
	exit(1);
    }

    Object object;
    cout << "address of object : " << hex << &object << endl;
    cout << "offset to bytes   : " << dec << (int)&object.bytes - (int)&object << endl;
    cout << "offset to c       : " << dec << (int)&object.c - (int)&object << endl;
    cout << "offset to val     : " << dec << (int)&object.val - (int)&object << endl;
    cout << "offset to str_l   : " << dec << (int)&object.str_length - (int)&object << endl;
    cout << "offset to string  : " << dec << (int)&object.string - (int)&object << endl;
    cout << "whole size of the Object class    : " << dec << sizeof(Object) << endl;

    ifstream fs(argv[1]);
    if (fs.bad()) {
	cerr << "cannot open " << argv[1] << endl;
	exit(1);
    }

    // size of whole object - size of Object::string
    int len = sizeof(Object) - sizeof (char *);

    fs.read((char *)&object, len);
    if (fs.bad()) {
	cerr << "stream errored." << endl;
	exit(1);
    }

    // always fix byte order
    object.val = ntohl(object.val);
    object.str_length = ntohl(object.str_length);

    len = object.str_length;
    object.string = new char[object.str_length + 1];

    fs.read(object.string, len);
    if (fs.bad()) {
	cerr << "stream errored." << endl;
	exit(1);
    }

    object.string[object.str_length] = 0; // append null

    cout << "bytes  :" << endl;
    for (int i=0; i<100; i++) {
	if (i%10 == 0)
	    cout << endl;
	cout << dec << (int) object.bytes[i] << " ";
    }
    cout << endl;
    cout << "c      : " << object.c << endl;
    cout << "val    : " << (object.val?"true":"false") << endl;
    //    cout << "len    : " << object.str_length << endl;
    cout << "string : " << object.string << endl;
}