/* -*- c++ -*-
 *
 * donkeysocket.cpp
 *
 * Copyright (C) 2003 Petter E. Stokke <gibreel@kmldonkey.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#include <kdebug.h>
#include <stdlib.h>

#include "donkeysocket.h"
#include "donkeysocket.moc"



DonkeySocket::DonkeySocket( QObject *parent, const char *name )
    : QSocket( parent, name)
{
    fifo.setAutoDelete(TRUE);
    mlHost = QString::null;
    mlPort = 4001;
    connect(this, SIGNAL(readyRead()), SLOT(readMessage()));
}

DonkeySocket::~DonkeySocket()
{
}

void DonkeySocket::connectDonkey()
{
    rstate = 0; ct = 0; sz = 0;
    kdDebug() << "Connecting to " << mlHost << ":" << mlPort << endl;
    connectToHost(mlHost, mlPort);
}

void DonkeySocket::connectDonkey(const QString& host, Q_UINT16 port)
{
    mlHost = host;
    mlPort = port;
    connectDonkey();
}

int DonkeySocket::sendMessage(const DonkeyMessage& msg)
{
    unsigned char op[4];
    int sz = msg.size() + 2;
    op[0] = (unsigned char)(sz & 0xff);
    op[1] = (unsigned char)((sz >> 8) & 0xff);
    op[2] = (unsigned char)((sz >> 16) & 0xff);
    op[3] = (unsigned char)((sz >> 24) & 0xff);
    Q_LONG r = writeBlock((const char *)op, 4);
    if (r != 4) return 0;
    op[0] = (unsigned char)(msg.opcode() & 0xff);
    op[1] = (unsigned char)((msg.opcode() >> 8) & 0xff);
    r = writeBlock((const char *)op, 2);
    if (r != 2) return 0;
    r = writeBlock((const char*)msg.data(), msg.size());
    return r == (Q_LONG)msg.size();
}

void DonkeySocket::readMessage()
{
    int done = 1;
    while (bytesAvailable() && done) {
        done = 0;
        if (!rstate && bytesAvailable() >= 4) {
            ct = 0; rstate = 1;
            sz = getch();
            sz |= getch() << 8;
            sz |= getch() << 16;
            sz |= getch() << 24;
            sz -= 2;
            done = 1;
        }
        if (rstate == 1 && (int)bytesAvailable() >= 2) {
            int opcode = getch();
            opcode |= getch() << 8;
            cur = new DonkeyMessage(opcode, sz);
            rstate = 2;
            done = 1;
        }
        if (rstate == 2 && (int)bytesAvailable()) {
            int a = (int)bytesAvailable() > (sz - ct) ? sz - ct : bytesAvailable();
            char* data = (char*)malloc(bytesAvailable());
            if (!data) exit(1);
            int r = (int)readBlock(data, a);
            if (r < 0) { rstate = 0; free(data); delete cur; kdDebug() << "Read error!" << endl; return; }
            cur->feedBuffer(data, r);
            free(data);
            ct += r;
            if (ct >= sz) {
                cur->resetPosition();
                fifo.enqueue(cur);
                cur = NULL;
                rstate = sz = ct = 0;
            }
            done = 1;
        }
    }
    if (!fifo.isEmpty())
        emit readyMessage();
}

uint DonkeySocket::queueSize()
{
    return fifo.count();
}

DonkeyMessage* DonkeySocket::popMessage()
{
    return fifo.dequeue();
}