// -*- c-basic-offset: 4 -*-
/*
 * packettest.{cc,hh} -- regression test element for packets
 * Eddie Kohler
 *
 * Copyright (c) 2002 International Computer Science Institute
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, subject to the conditions
 * listed in the Click LICENSE file. These conditions include: you must
 * preserve this copyright notice, and you cannot mention the copyright
 * holders in advertising related to the Software without their permission.
 * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
 * notice is a summary of the Click LICENSE file; the license in that file is
 * legally binding.
 */

#include <click/config.h>
#include "packettest.hh"
#include <click/error.hh>
CLICK_DECLS

PacketTest::PacketTest()
{
}

PacketTest::~PacketTest()
{
}

#define CHECK(x) if (!(x)) return errh->error("%s:%d: test `%s' failed", __FILE__, __LINE__, #x);
#define CHECK_DATA(x, y, l) CHECK(memcmp((x), (y), (l)) == 0)
#define CHECK_ALIGNED(x) CHECK((reinterpret_cast<uintptr_t>((x)) & 3) == 0)

int
PacketTest::initialize(ErrorHandler *errh)
{
    const unsigned char *lowers = (const unsigned char *)"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz";
    IPAddress addr(String("1.2.3.4"));
    
    Packet *p = Packet::make(10, lowers, 20, 30);
    CHECK(p->headroom() >= 10);
    CHECK(p->tailroom() >= 30);
    CHECK(p->length() == 20);
    CHECK(p->buffer_length() >= 60);
    CHECK_DATA(p->data(), lowers, 20);
    CHECK(!p->mac_header());
    CHECK(!p->network_header());
    CHECK(!p->transport_header());
    p->set_mac_header(p->data(), 10);
    CHECK(p->network_header() == p->data() + 10);
    p->set_dst_ip_anno(addr);

    WritablePacket *p1 = p->push(5);
    // p is dead
    CHECK(p == p1);
    CHECK(p1->headroom() >= 5);
    CHECK(p1->tailroom() >= 30);
    CHECK(p1->length() == 25);
    CHECK_DATA(p1->data() + 5, lowers, 20);
    CHECK(p1->mac_header() == p->data() + 5);
    CHECK(p1->network_header() == p->data() + 15);
    CHECK(p1->dst_ip_anno() == addr);

    Packet *p2 = p1->clone();
    CHECK(p2 != p1);
    CHECK(p2->data() == p1->data());
    CHECK(p2->length() == 25);
    CHECK(p1->shared() && p2->shared());
    CHECK(p1->mac_header() == p2->mac_header());
    CHECK(p2->dst_ip_anno() == addr);

    WritablePacket *p3 = p2->push(5);
    // p2 is dead
    CHECK(p3 != p1);
    CHECK(p3->length() == 30);
    CHECK_DATA(p3->data() + 10, lowers, 20);
    memcpy(p3->data(), lowers, 10);
    memcpy(p1->data(), lowers, 5);
    CHECK_DATA(p3->data(), lowers, 10);
    CHECK_DATA(p1->data(), lowers, 5);
    CHECK(p3->mac_header() != p1->mac_header());
    CHECK(p3->mac_header() == p3->data() + 10);
    CHECK(p3->network_header() == p3->data() + 20);
    CHECK(!p1->shared() && !p3->shared());
    CHECK(p3->dst_ip_anno() == addr);

    p1->kill();
    p3->kill();

#if 0
    // test shift_data()
    p = Packet::make(10, lowers, 60, 4);
    CHECK(p->headroom() == 10 && p->tailroom() == 4);
    p = p->shift_data(-2);
    CHECK(p->headroom() == 8 && p->tailroom() == 6);
    CHECK(p->length() == 60);
    CHECK_DATA(p->data(), lowers, 60);
    CHECK_ALIGNED(p->data());
    p->kill();
    
    p = Packet::make(9, lowers, 60, 4);
    p = p->shift_data(3);
    CHECK(p->headroom() == 12 && p->tailroom() == 1 && p->length() == 60);
    CHECK_DATA(p->data(), lowers, 60);
    CHECK_ALIGNED(p->data());
    p->kill();
    
    p = Packet::make(1, lowers, 60, 4);
    p = p->shift_data(-5);
    CHECK(p->tailroom() >= 9 && p->length() == 60);
    CHECK_DATA(p->data(), lowers, 60);
    CHECK_ALIGNED(p->data());
    p->kill();
    
    p = Packet::make(5, lowers, 60, 2);
    p = p->shift_data(3);
    CHECK(p->headroom() >= 8 && p->length() == 60);
    CHECK_DATA(p->data(), lowers, 60);
    CHECK_ALIGNED(p->data());
    p->kill();
#endif
    
    errh->message("All tests pass!");
    return 0;
}

CLICK_ENDDECLS
EXPORT_ELEMENT(PacketTest)