/* $Id: VBoxGuestR3LibClipboard.cpp $ */
/** @file
 * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Clipboard.
 */

/*
 * Copyright (C) 2007-2019 Oracle Corporation
 *
 * 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.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#include <VBox/HostServices/VBoxClipboardSvc.h>
#include <VBox/err.h>
#include <iprt/assert.h>
#include <iprt/string.h>
#include "VBoxGuestR3LibInternal.h"


/**
 * Connects to the clipboard service.
 *
 * @returns VBox status code
 * @param   pidClient       Where to put the client id on success. The client id
 *                          must be passed to all the other clipboard calls.
 */
VBGLR3DECL(int) VbglR3ClipboardConnect(HGCMCLIENTID *pidClient)
{
    int rc = VbglR3HGCMConnect("VBoxSharedClipboard", pidClient);
    if (rc == VERR_HGCM_SERVICE_NOT_FOUND)
        rc = VINF_PERMISSION_DENIED;
    return rc;
}


/**
 * Disconnect from the clipboard service.
 *
 * @returns VBox status code.
 * @param   idClient        The client id returned by VbglR3ClipboardConnect().
 */
VBGLR3DECL(int) VbglR3ClipboardDisconnect(HGCMCLIENTID idClient)
{
    return VbglR3HGCMDisconnect(idClient);
}


/**
 * Get a host message.
 *
 * This will block until a message becomes available.
 *
 * @returns VBox status code.
 * @param   idClient        The client id returned by VbglR3ClipboardConnect().
 * @param   pidMsg          Where to store the message id.
 * @param   pfFormats       Where to store the format(s) the message applies to.
 */
VBGLR3DECL(int) VbglR3ClipboardGetHostMsg(HGCMCLIENTID idClient, uint32_t *pidMsg, uint32_t *pfFormats)
{
    VBoxClipboardGetHostMsg Msg;

    VBGL_HGCM_HDR_INIT(&Msg.hdr, idClient, VBOX_SHARED_CLIPBOARD_FN_GET_HOST_MSG, 2);
    VbglHGCMParmUInt32Set(&Msg.msg, 0);
    VbglHGCMParmUInt32Set(&Msg.formats, 0);

    int rc = VbglR3HGCMCall(&Msg.hdr, sizeof(Msg));
    if (RT_SUCCESS(rc))
    {
        int rc2 = VbglHGCMParmUInt32Get(&Msg.msg, pidMsg);
        if (RT_SUCCESS(rc))
        {
            rc2 = VbglHGCMParmUInt32Get(&Msg.formats, pfFormats);
            if (RT_SUCCESS(rc2))
                return rc;
        }
        rc = rc2;
    }
    *pidMsg    = UINT32_MAX - 1;
    *pfFormats = UINT32_MAX;
    return rc;
}


/**
 * Reads data from the host clipboard.
 *
 * @returns VBox status code.
 * @retval  VINF_BUFFER_OVERFLOW    If there is more data available than the caller provided buffer space for.
 *
 * @param   idClient        The client id returned by VbglR3ClipboardConnect().
 * @param   fFormat         The format we're requesting the data in.
 * @param   pv              Where to store the data.
 * @param   cb              The size of the buffer pointed to by pv.
 * @param   pcb             The actual size of the host clipboard data. May be larger than cb.
 */
VBGLR3DECL(int) VbglR3ClipboardReadData(HGCMCLIENTID idClient, uint32_t fFormat, void *pv, uint32_t cb, uint32_t *pcb)
{
    VBoxClipboardReadData Msg;

    VBGL_HGCM_HDR_INIT(&Msg.hdr, idClient, VBOX_SHARED_CLIPBOARD_FN_READ_DATA, 3);
    VbglHGCMParmUInt32Set(&Msg.format, fFormat);
    VbglHGCMParmPtrSet(&Msg.ptr, pv, cb);
    VbglHGCMParmUInt32Set(&Msg.size, 0);

    int rc = VbglR3HGCMCall(&Msg.hdr, sizeof(Msg));
    if (RT_SUCCESS(rc))
    {
        uint32_t cbActual;
        int rc2 = VbglHGCMParmUInt32Get(&Msg.size, &cbActual);
        if (RT_SUCCESS(rc2))
        {
            *pcb = cbActual;
            if (cbActual > cb)
                return VINF_BUFFER_OVERFLOW;
            return rc;
        }
        rc = rc2;
    }
    return rc;
}


/**
 * Advertises guest clipboard formats to the host.
 *
 * @returns VBox status code.
 * @param   idClient        The client id returned by VbglR3ClipboardConnect().
 * @param   fFormats        The formats to advertise.
 */
VBGLR3DECL(int) VbglR3ClipboardReportFormats(HGCMCLIENTID idClient, uint32_t fFormats)
{
    VBoxClipboardFormats Msg;

    VBGL_HGCM_HDR_INIT(&Msg.hdr, idClient, VBOX_SHARED_CLIPBOARD_FN_FORMATS, 1);
    VbglHGCMParmUInt32Set(&Msg.formats, fFormats);

    return VbglR3HGCMCall(&Msg.hdr, sizeof(Msg));
}


/**
 * Send guest clipboard data to the host.
 *
 * This is usually called in reply to a VBOX_SHARED_CLIPBOARD_HOST_MSG_READ_DATA message
 * from the host.
 *
 * @returns VBox status code.
 * @param   idClient        The client id returned by VbglR3ClipboardConnect().
 * @param   fFormat         The format of the data.
 * @param   pv              The data.
 * @param   cb              The size of the data.
 */
VBGLR3DECL(int) VbglR3ClipboardWriteData(HGCMCLIENTID idClient, uint32_t fFormat, void *pv, uint32_t cb)
{
    VBoxClipboardWriteData Msg;
    VBGL_HGCM_HDR_INIT(&Msg.hdr, idClient, VBOX_SHARED_CLIPBOARD_FN_WRITE_DATA, 2);
    VbglHGCMParmUInt32Set(&Msg.format, fFormat);
    VbglHGCMParmPtrSet(&Msg.ptr, pv, cb);

    return VbglR3HGCMCall(&Msg.hdr, sizeof(Msg));
}