source: vbox/trunk/src/VBox/HostServices/SharedClipboard/darwin.cpp@ 7117

/* $Id: darwin.cpp 7117 2008-02-25 15:54:42Z vboxsync $ */
/** @file
 * Shared Clipboard: Mac OS X host.
 */

/*
 * Copyright (C) 2008 innotek GmbH
 *
 * 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.
 */

#include <VBox/HostServices/VBoxClipboardSvc.h>

#include <iprt/assert.h>
#include <iprt/thread.h>

#include "VBoxClipboard.h"
/* We do the work in a separate cpp file because
 * of the conflicting typedef "OSType". This is
 * defined in Carbon and in VBox/ostypes.h also. */
#include "darwin-pasteboard.h"

/** Global clipboard context information */
struct _VBOXCLIPBOARDCONTEXT
{
    /** We have a separate thread to poll for new clipboard content */
    RTTHREAD thread;
    bool volatile fTerminate;

    /** The reference to the current pasteboard */
    PasteboardRef pasteboard;

    VBOXCLIPBOARDCLIENTDATA *pClient;
};

/** Only one client is supported. There seems to be no need for more clients. */
static VBOXCLIPBOARDCONTEXT g_ctx;

int vboxClipboardChanged (VBOXCLIPBOARDCONTEXT *pCtx)
{
    if (pCtx->pClient == NULL)
        return VINF_SUCCESS;

    uint32_t fFormats = 0;
    /* Retrieve the formats currently in the clipboard and supported by vbox */
    int rc = queryPasteboardFormats (pCtx->pasteboard, fFormats);

    if (fFormats > 0)
    {
        vboxSvcClipboardReportMsg (pCtx->pClient, VBOX_SHARED_CLIPBOARD_HOST_MSG_FORMATS, fFormats);
        Log (("vboxClipboardChanged fFormats %02X\n", fFormats));
    }

    return rc;
}

static int vboxClipboardThread (RTTHREAD self, void *pvUser)
{
    Log (("vboxClipboardThread: starting clipboard thread\n"));

    AssertReturn (VALID_PTR (pvUser), VERR_INVALID_PARAMETER);

    VBOXCLIPBOARDCONTEXT *pCtx = static_cast <VBOXCLIPBOARDCONTEXT*> (pvUser);

    while (!pCtx->fTerminate)
    {
       vboxClipboardChanged (pCtx);
       /* Sleep for 200 msecs before next poll */
       RTThreadSleep (200);
    }

    Log (("vboxClipboardThread: clipboard thread terminated successfully with return code %Vrc\n", VINF_SUCCESS));
    return VINF_SUCCESS;
}

/*
 * Public platform dependent functions.
 */

/** Initialise the host side of the shared clipboard - called by the hgcm layer. */
int vboxClipboardInit (void)
{
    Log (("vboxClipboardInit\n"));

    int rc = VINF_SUCCESS;

    g_ctx.fTerminate = false;

    rc = initPasteboard (&g_ctx.pasteboard);

    rc = RTThreadCreate (&g_ctx.thread, vboxClipboardThread, &g_ctx, 0,
                         RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "SHCLIP");

    return rc;
}

/** Terminate the host side of the shared clipboard - called by the hgcm layer. */
void vboxClipboardDestroy (void)
{
    Log (("vboxClipboardDestroy\n"));

    g_ctx.fTerminate = true;

    destroyPasteboard (&g_ctx.pasteboard);

    /* Wait for the clipboard thread to terminate. */
    RTThreadWait (g_ctx.thread, RT_INDEFINITE_WAIT, NULL);

    g_ctx.thread = NIL_RTTHREAD;
}

/**
  * Enable the shared clipboard - called by the hgcm clipboard subsystem.
  *
  * @param   pClient Structure containing context information about the guest system
  * @returns RT status code
  */
int vboxClipboardConnect (VBOXCLIPBOARDCLIENTDATA *pClient)
{
    if (g_ctx.pClient != NULL)
    {
        /* One client only. */
        return VERR_NOT_SUPPORTED;
    }

    pClient->pCtx = &g_ctx;
    pClient->pCtx->pClient = pClient;

    /* Initially sync the host clipboard content with the client. */
    int rc = vboxClipboardSync (pClient);

    return rc;
}

/**
 * Synchronise the contents of the host clipboard with the guest, called by the HGCM layer
 * after a save and restore of the guest.
 */
int vboxClipboardSync (VBOXCLIPBOARDCLIENTDATA *pClient)
{
    /* Sync the host clipboard content with the client. */
    int rc = vboxClipboardChanged (pClient->pCtx);

    return rc;
}

/**
 * Shut down the shared clipboard subsystem and "disconnect" the guest.
 */
void vboxClipboardDisconnect (VBOXCLIPBOARDCLIENTDATA * /* pClient */)
{
    Log (("vboxClipboardDisconnect\n"));

    g_ctx.pClient = NULL;
}

/**
 * The guest is taking possession of the shared clipboard.  Called by the HGCM clipboard
 * subsystem.
 *
 * @param pClient    Context data for the guest system
 * @param u32Formats Clipboard formats the the guest is offering
 */
void vboxClipboardFormatAnnounce (VBOXCLIPBOARDCLIENTDATA * /* pClient */,
                                  uint32_t u32Formats)
{
    Log (("vboxClipboardFormatAnnounce u32Formats %02X\n", u32Formats));
    if (u32Formats == 0)
    {
        /* This is just an automatism, not a genuine anouncement */
        return;
    }

    vboxSvcClipboardReportMsg (g_ctx.pClient, VBOX_SHARED_CLIPBOARD_HOST_MSG_READ_DATA,
                               u32Formats);
}

/**
 * Called by the HGCM clipboard subsystem when the guest wants to read the host clipboard.
 *
 * @param pClient   Context information about the guest VM
 * @param u32Format The format that the guest would like to receive the data in
 * @param pv        Where to write the data to
 * @param cb        The size of the buffer to write the data to
 * @param pcbActual Where to write the actual size of the written data
 */
int vboxClipboardReadData (VBOXCLIPBOARDCLIENTDATA * /* pClient */, uint32_t u32Format,
                           void *pv, uint32_t cb, uint32_t * pcbActual)
{
    /* Default to no data available. */
    *pcbActual = 0;
    int rc = readFromPasteboard (g_ctx.pasteboard, u32Format, pv, cb, pcbActual);

    return rc;
}

/**
 * Called by the HGCM clipboard subsystem when we have requested data and that data arrives.
 *
 * @param pClient   Context information about the guest VM
 * @param pv        Buffer to which the data was written
 * @param cb        The size of the data written
 * @param u32Format The format of the data written
 */
void vboxClipboardWriteData (VBOXCLIPBOARDCLIENTDATA * /* pClient */, void *pv,
                             uint32_t cb, uint32_t u32Format)
{
    writeToPasteboard (g_ctx.pasteboard, pv, cb, u32Format);
}