source: vbox/trunk/src/VBox/Main/ParallelPortImpl.cpp@ 25202

/* $Id: ParallelPortImpl.cpp 25202 2009-12-04 19:13:21Z vboxsync $ */
/** @file
 * VirtualBox COM class implementation
 */

/*
 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 USA or visit http://www.sun.com if you need
 * additional information or have any questions.
 */

#include "ParallelPortImpl.h"
#include "MachineImpl.h"
#include "VirtualBoxImpl.h"
#include "Logging.h"

#include <iprt/string.h>
#include <iprt/cpputils.h>

#include <VBox/settings.h>

////////////////////////////////////////////////////////////////////////////////
//
// ParallelPort private data definition
//
////////////////////////////////////////////////////////////////////////////////

struct ParallelPort::Data
{
    Data()
    { }

    const ComObjPtr<Machine, ComWeakRef>    pMachine;
    const ComObjPtr<ParallelPort>           pPeer;

    Backupable<settings::ParallelPort>      bd;
};

// constructor / destructor
/////////////////////////////////////////////////////////////////////////////

HRESULT ParallelPort::FinalConstruct()
{
    return S_OK;
}

void ParallelPort::FinalRelease()
{
    uninit();
}

// public initializer/uninitializer for internal purposes only
/////////////////////////////////////////////////////////////////////////////

/**
 *  Initializes the Parallel Port object.
 *
 *  @param aParent  Handle of the parent object.
 */
HRESULT ParallelPort::init(Machine *aParent, ULONG aSlot)
{
    LogFlowThisFunc(("aParent=%p, aSlot=%d\n", aParent, aSlot));

    ComAssertRet (aParent, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan(this);
    AssertReturn(autoInitSpan.isOk(), E_FAIL);

    m = new Data;

    unconst(m->pMachine) = aParent;
    /* m->pPeer is left null */

    m->bd.allocate();

    /* initialize data */
    m->bd->ulSlot = aSlot;

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Initializes the Parallel Port object given another serial port object
 *  (a kind of copy constructor). This object shares data with
 *  the object passed as an argument.
 *
 *  @note This object must be destroyed before the original object
 *  it shares data with is destroyed.
 *
 *  @note Locks @a aThat object for reading.
 */
HRESULT ParallelPort::init(Machine *aParent, ParallelPort *aThat)
{
    LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));

    ComAssertRet (aParent && aThat, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan(this);
    AssertReturn(autoInitSpan.isOk(), E_FAIL);

    m = new Data;

    unconst(m->pMachine) = aParent;
    unconst(m->pPeer) = aThat;

    AutoCaller thatCaller (aThat);
    AssertComRCReturnRC(thatCaller.rc());

    AutoReadLock thatLock(aThat);
    m->bd.share(aThat->m->bd);

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Initializes the guest object given another guest object
 *  (a kind of copy constructor). This object makes a private copy of data
 *  of the original object passed as an argument.
 *
 *  @note Locks @a aThat object for reading.
 */
HRESULT ParallelPort::initCopy(Machine *aParent, ParallelPort *aThat)
{
    LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));

    ComAssertRet (aParent && aThat, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan(this);
    AssertReturn(autoInitSpan.isOk(), E_FAIL);

    m = new Data;

    unconst(m->pMachine) = aParent;
    /* m->pPeer is left null */

    AutoCaller thatCaller(aThat);
    AssertComRCReturnRC(thatCaller.rc());

    AutoReadLock thatLock(aThat);
    m->bd.attachCopy(aThat->m->bd);

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Uninitializes the instance and sets the ready flag to FALSE.
 *  Called either from FinalRelease() or by the parent when it gets destroyed.
 */
void ParallelPort::uninit()
{
    LogFlowThisFunc(("\n"));

    /* Enclose the state transition Ready->InUninit->NotReady */
    AutoUninitSpan autoUninitSpan(this);
    if (autoUninitSpan.uninitDone())
        return;

    m->bd.free();

    unconst(m->pPeer).setNull();
    unconst(m->pMachine).setNull();

    delete m;
    m = NULL;
}

// IParallelPort properties
/////////////////////////////////////////////////////////////////////////////

STDMETHODIMP ParallelPort::COMGETTER(Enabled) (BOOL *aEnabled)
{
    CheckComArgOutPointerValid(aEnabled);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this);

    *aEnabled = m->bd->fEnabled;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(Enabled) (BOOL aEnabled)
{
    LogFlowThisFunc(("aEnabled=%RTbool\n", aEnabled));

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep(m->pMachine);
    if (FAILED(adep.rc())) return adep.rc();

    AutoWriteLock alock(this);

    if (m->bd->fEnabled != aEnabled)
    {
        if (aEnabled &&
            m->bd->strPath.isEmpty())
            return setError (E_INVALIDARG,
                        tr ("Cannot enable the parallel port %d "
                            "because the port path is empty or null"),
                        m->bd->ulSlot);

        m->bd.backup();
        m->bd->fEnabled = aEnabled;

        /* leave the lock before informing callbacks */
        alock.unlock();

        m->pMachine->onParallelPortChange (this);
    }

    return S_OK;
}

STDMETHODIMP ParallelPort::COMGETTER(Slot) (ULONG *aSlot)
{
    CheckComArgOutPointerValid(aSlot);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this);

    *aSlot = m->bd->ulSlot;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMGETTER(IRQ) (ULONG *aIRQ)
{
    CheckComArgOutPointerValid(aIRQ);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this);

    *aIRQ = m->bd->ulIRQ;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(IRQ)(ULONG aIRQ)
{
    /* check IRQ limits
     * (when changing this, make sure it corresponds to XML schema */
    if (aIRQ > 255)
        return setError (E_INVALIDARG,
            tr ("Invalid IRQ number of the parallel port %d: "
                "%lu (must be in range [0, %lu])"),
            m->bd->ulSlot, aIRQ, 255);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep(m->pMachine);
    if (FAILED(adep.rc())) return adep.rc();

    AutoWriteLock alock(this);

    HRESULT rc = S_OK;
    bool emitChangeEvent = false;

    if (m->bd->ulIRQ != aIRQ)
    {
        m->bd.backup();
        m->bd->ulIRQ = aIRQ;
        emitChangeEvent = true;
    }

    if (emitChangeEvent)
    {
        /* leave the lock before informing callbacks */
        alock.unlock();

        m->pMachine->onParallelPortChange (this);
    }

    return rc;
}

STDMETHODIMP ParallelPort::COMGETTER(IOBase) (ULONG *aIOBase)
{
    CheckComArgOutPointerValid(aIOBase);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this);

    *aIOBase = m->bd->ulIOBase;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(IOBase)(ULONG aIOBase)
{
    /* check IOBase limits
     * (when changing this, make sure it corresponds to XML schema */
    if (aIOBase > 0xFFFF)
        return setError (E_INVALIDARG,
            tr ("Invalid I/O port base address of the parallel port %d: "
                "%lu (must be in range [0, 0x%X])"),
            m->bd->ulSlot, aIOBase, 0, 0xFFFF);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep(m->pMachine);
    if (FAILED(adep.rc())) return adep.rc();

    AutoWriteLock alock(this);

    HRESULT rc = S_OK;
    bool emitChangeEvent = false;

    if (m->bd->ulIOBase != aIOBase)
    {
        m->bd.backup();
        m->bd->ulIOBase = aIOBase;
        emitChangeEvent = true;
    }

    if (emitChangeEvent)
    {
        /* leave the lock before informing callbacks */
        alock.unlock();

        m->pMachine->onParallelPortChange (this);
    }

    return rc;
}

STDMETHODIMP ParallelPort::COMGETTER(Path) (BSTR *aPath)
{
    CheckComArgOutPointerValid(aPath);

    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    AutoReadLock alock(this);

    m->bd->strPath.cloneTo(aPath);

    return S_OK;
}

/**
 *  Validates COMSETTER(Path) arguments.
 */
HRESULT ParallelPort::checkSetPath(const Utf8Str &str)
{
    AssertReturn(isWriteLockOnCurrentThread(), E_FAIL);

    if (    m->bd->fEnabled
         && str.isEmpty()
       )
        return setError(E_INVALIDARG,
                        tr("Path of the parallel port %d may not be empty or null "
                           "when the port is enabled"),
                        m->bd->ulSlot);

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(Path) (IN_BSTR aPath)
{
    AutoCaller autoCaller(this);
    if (FAILED(autoCaller.rc())) return autoCaller.rc();

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep(m->pMachine);
    if (FAILED(adep.rc())) return adep.rc();

    AutoWriteLock alock(this);

    Utf8Str str(aPath);
    if (str != m->bd->strPath)
    {
        HRESULT rc = checkSetPath(str);
        if (FAILED(rc)) return rc;

        m->bd.backup();
        m->bd->strPath = str;

        /* leave the lock before informing callbacks */
        alock.unlock();

        return m->pMachine->onParallelPortChange (this);
    }

    return S_OK;
}

// public methods only for internal purposes
////////////////////////////////////////////////////////////////////////////////

/**
 *  Loads settings from the given port node.
 *  May be called once right after this object creation.
 *
 *  @param aPortNode <Port> node.
 *
 *  @note Locks this object for writing.
 */
HRESULT ParallelPort::loadSettings(const settings::ParallelPort &data)
{
    AutoCaller autoCaller(this);
    AssertComRCReturnRC(autoCaller.rc());

    AutoWriteLock alock(this);

    // simply copy
    *m->bd.data() = data;

    return S_OK;
}

/**
 *  Saves settings to the given port node.
 *
 *  Note that the given Port node is comletely empty on input.
 *
 *  @param aPortNode <Port> node.
 *
 *  @note Locks this object for reading.
 */
HRESULT ParallelPort::saveSettings(settings::ParallelPort &data)
{
    AutoCaller autoCaller(this);
    AssertComRCReturnRC(autoCaller.rc());

    AutoReadLock alock(this);

    // simply copy
    data = *m->bd.data();

    return S_OK;
}

bool ParallelPort::isModified()
{
    AutoWriteLock alock (this);
    return m->bd.isBackedUp();
}

bool ParallelPort::isReallyModified()
{
    AutoWriteLock alock(this);
    return m->bd.hasActualChanges();
}

/**
 *  @note Locks this object for writing.
 */
bool ParallelPort::rollback()
{
    /* sanity */
    AutoCaller autoCaller(this);
    AssertComRCReturn (autoCaller.rc(), false);

    AutoWriteLock alock(this);

    bool changed = false;

    if (m->bd.isBackedUp())
    {
        /* we need to check all data to see whether anything will be changed
         * after rollback */
        changed = m->bd.hasActualChanges();
        m->bd.rollback();
    }

    return changed;
}

/**
 *  @note Locks this object for writing, together with the peer object (also
 *  for writing) if there is one.
 */
void ParallelPort::commit()
{
    /* sanity */
    AutoCaller autoCaller(this);
    AssertComRCReturnVoid (autoCaller.rc());

    /* sanity too */
    AutoCaller peerCaller (m->pPeer);
    AssertComRCReturnVoid (peerCaller.rc());

    /* lock both for writing since we modify both (m->pPeer is "master" so locked
     * first) */
    AutoMultiWriteLock2 alock (m->pPeer, this);

    if (m->bd.isBackedUp())
    {
        m->bd.commit();
        if (m->pPeer)
        {
            /* attach new data to the peer and reshare it */
            m->pPeer->m->bd.attach(m->bd);
        }
    }
}

/**
 *  @note Locks this object for writing, together with the peer object
 *  represented by @a aThat (locked for reading).
 */
void ParallelPort::copyFrom (ParallelPort *aThat)
{
    AssertReturnVoid (aThat != NULL);

    /* sanity */
    AutoCaller autoCaller(this);
    AssertComRCReturnVoid (autoCaller.rc());

    /* sanity too */
    AutoCaller thatCaller (aThat);
    AssertComRCReturnVoid (thatCaller.rc());

    /* peer is not modified, lock it for reading (aThat is "master" so locked
     * first) */
    AutoMultiLock2 alock (aThat->rlock(), this->wlock());

    /* this will back up current data */
    m->bd.assignCopy(aThat->m->bd);
}


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