FreeRDP/channels/rdpgfx/client/rdpgfx_main.c

/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Graphics Pipeline Extension
 *
 * Copyright 2013-2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2015 Thincast Technologies GmbH
 * Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
 * Copyright 2016 Thincast Technologies GmbH
 * Copyright 2016 Armin Novak <armin.novak@thincast.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <assert.h>

#include <winpr/crt.h>
#include <winpr/wlog.h>
#include <winpr/print.h>
#include <winpr/synch.h>
#include <winpr/thread.h>
#include <winpr/stream.h>
#include <winpr/sysinfo.h>
#include <winpr/cmdline.h>
#include <winpr/collections.h>

#include <freerdp/addin.h>
#include <freerdp/channels/log.h>

#include "rdpgfx_common.h"
#include "rdpgfx_codec.h"

#include "rdpgfx_main.h"

#define TAG CHANNELS_TAG("rdpgfx.client")

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_send_caps_advertise_pdu(RdpgfxClientContext* context,
        const RDPGFX_CAPS_ADVERTISE_PDU* pdu)
{
	UINT error = CHANNEL_RC_OK;
	UINT16 index;
	RDPGFX_HEADER header;
	RDPGFX_CAPSET* capsSet;
	RDPGFX_PLUGIN* gfx;
	RDPGFX_CHANNEL_CALLBACK* callback;
	wStream* s;
	gfx = (RDPGFX_PLUGIN*) context->handle;
	callback = gfx->listener_callback->channel_callback;
	header.flags = 0;
	header.cmdId = RDPGFX_CMDID_CAPSADVERTISE;
	header.pduLength = RDPGFX_HEADER_SIZE + 2;

	for (index = 0; index < pdu->capsSetCount; index++)
	{
		capsSet = &(pdu->capsSets[index]);
		header.pduLength += RDPGFX_CAPSET_BASE_SIZE + capsSet->length;
	}

	WLog_Print(gfx->log, WLOG_DEBUG, "SendCapsAdvertisePdu %"PRIu16"", pdu->capsSetCount);
	s = Stream_New(NULL, header.pduLength);

	if (!s)
	{
		WLog_ERR(TAG, "Stream_New failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	if ((error = rdpgfx_write_header(s, &header)))
		goto fail;

	/* RDPGFX_CAPS_ADVERTISE_PDU */
	Stream_Write_UINT16(s, pdu->capsSetCount); /* capsSetCount (2 bytes) */

	for (index = 0; index < pdu->capsSetCount; index++)
	{
		capsSet = &(pdu->capsSets[index]);
		Stream_Write_UINT32(s, capsSet->version); /* version (4 bytes) */
		Stream_Write_UINT32(s, capsSet->length); /* capsDataLength (4 bytes) */
		Stream_Write_UINT32(s, capsSet->flags); /* capsData (4 bytes) */
		Stream_Zero(s, capsSet->length - 4);
	}

	Stream_SealLength(s);
	error = callback->channel->Write(callback->channel, (UINT32) Stream_Length(s),
	                                 Stream_Buffer(s), NULL);
fail:
	Stream_Free(s, TRUE);
	return error;
}

static BOOL rdpgfx_is_capability_filtered(RDPGFX_PLUGIN* gfx, UINT32 caps)
{
	const UINT32 filter = gfx->capsFilter;
	const UINT32 capList[] =
	{
		RDPGFX_CAPVERSION_8,
		RDPGFX_CAPVERSION_81,
		RDPGFX_CAPVERSION_10,
		RDPGFX_CAPVERSION_101,
		RDPGFX_CAPVERSION_102,
		RDPGFX_CAPVERSION_103,
		RDPGFX_CAPVERSION_104,
		RDPGFX_CAPVERSION_105,
		RDPGFX_CAPVERSION_106
	};
	UINT32 x;

	for (x = 0; x < ARRAYSIZE(capList); x++)
	{
		if (caps == capList[x])
			return (filter & (1 << x)) != 0;
	}

	return TRUE;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_send_supported_caps(RDPGFX_CHANNEL_CALLBACK* callback)
{
	RDPGFX_PLUGIN* gfx;
	RdpgfxClientContext* context;
	RDPGFX_CAPSET* capsSet;
	RDPGFX_CAPSET capsSets[RDPGFX_NUMBER_CAPSETS] = { 0 };
	RDPGFX_CAPS_ADVERTISE_PDU pdu;

	if (!callback)
		return ERROR_BAD_ARGUMENTS;

	gfx = (RDPGFX_PLUGIN*) callback->plugin;

	if (!gfx)
		return ERROR_BAD_CONFIGURATION;

	context = (RdpgfxClientContext*) gfx->iface.pInterface;

	if (!context)
		return ERROR_BAD_CONFIGURATION;

	pdu.capsSetCount = 0;
	pdu.capsSets = (RDPGFX_CAPSET*) capsSets;

	if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_8))
	{
		capsSet = &capsSets[pdu.capsSetCount++];
		capsSet->version = RDPGFX_CAPVERSION_8;
		capsSet->length = 4;
		capsSet->flags = 0;

		if (gfx->ThinClient)
			capsSet->flags |= RDPGFX_CAPS_FLAG_THINCLIENT;

		/* in CAPVERSION_8 the spec says that we should not have both
		 * thinclient and smallcache (and thinclient implies a small cache)
		 */
		if (gfx->SmallCache && !gfx->ThinClient)
			capsSet->flags |= RDPGFX_CAPS_FLAG_SMALL_CACHE;
	}

	if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_81))
	{
		capsSet = &capsSets[pdu.capsSetCount++];
		capsSet->version = RDPGFX_CAPVERSION_81;
		capsSet->length = 4;
		capsSet->flags = 0;

		if (gfx->ThinClient)
			capsSet->flags |= RDPGFX_CAPS_FLAG_THINCLIENT;

		if (gfx->SmallCache)
			capsSet->flags |= RDPGFX_CAPS_FLAG_SMALL_CACHE;

#ifdef WITH_GFX_H264

		if (gfx->H264)
			capsSet->flags |= RDPGFX_CAPS_FLAG_AVC420_ENABLED;

#endif
	}

	if (!gfx->H264 || gfx->AVC444)
	{
		UINT32 caps10Flags = 0;

		if (gfx->SmallCache)
			caps10Flags |= RDPGFX_CAPS_FLAG_SMALL_CACHE;

#ifdef WITH_GFX_H264

		if (!gfx->AVC444)
			caps10Flags |= RDPGFX_CAPS_FLAG_AVC_DISABLED;

#else
		caps10Flags |= RDPGFX_CAPS_FLAG_AVC_DISABLED;
#endif

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_10))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_10;
			capsSet->length = 4;
			capsSet->flags = caps10Flags;
		}

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_101))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_101;
			capsSet->length = 0x10;
			capsSet->flags = 0;
		}

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_102))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_102;
			capsSet->length = 0x4;
			capsSet->flags = caps10Flags;
		}

		if (gfx->ThinClient)
			caps10Flags |= RDPGFX_CAPS_FLAG_AVC_THINCLIENT;

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_103))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_103;
			capsSet->length = 0x4;
			capsSet->flags = caps10Flags & ~RDPGFX_CAPS_FLAG_SMALL_CACHE;
		}

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_104))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_104;
			capsSet->length = 0x4;
			capsSet->flags = caps10Flags;
		}

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_105))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_105;
			capsSet->length = 0x4;
			capsSet->flags = caps10Flags;
		}

		if (!rdpgfx_is_capability_filtered(gfx, RDPGFX_CAPVERSION_106))
		{
			capsSet = &capsSets[pdu.capsSetCount++];
			capsSet->version = RDPGFX_CAPVERSION_106;
			capsSet->length = 0x4;
			capsSet->flags = caps10Flags;
		}
	}

	return IFCALLRESULT(ERROR_BAD_CONFIGURATION, context->CapsAdvertise, context, &pdu);
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_caps_confirm_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_CAPSET capsSet;
	RDPGFX_CAPS_CONFIRM_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	pdu.capsSet = &capsSet;

	if (Stream_GetRemainingLength(s) < 12)
	{
		WLog_ERR(TAG, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT32(s, capsSet.version); /* version (4 bytes) */
	Stream_Read_UINT32(s, capsSet.length); /* capsDataLength (4 bytes) */
	Stream_Read_UINT32(s, capsSet.flags); /* capsData (4 bytes) */
	gfx->ConnectionCaps = capsSet;
	WLog_Print(gfx->log, WLOG_DEBUG, "RecvCapsConfirmPdu: version: 0x%08"PRIX32" flags: 0x%08"PRIX32"",
	           capsSet.version, capsSet.flags);

	if (context)
	{
		IFCALL(context->CapsConfirm, context, &pdu);
	}

	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_send_frame_acknowledge_pdu(RdpgfxClientContext* context,
        const RDPGFX_FRAME_ACKNOWLEDGE_PDU* pdu)
{
	UINT error;
	wStream* s;
	RDPGFX_HEADER header;
	RDPGFX_PLUGIN* gfx;
	RDPGFX_CHANNEL_CALLBACK* callback;

	if (!context || !pdu)
		return ERROR_BAD_ARGUMENTS;

	gfx = (RDPGFX_PLUGIN*) context->handle;

	if (!gfx)
		return ERROR_BAD_CONFIGURATION;

	callback = gfx->listener_callback->channel_callback;

	if (!callback)
		return ERROR_BAD_CONFIGURATION;

	header.flags = 0;
	header.cmdId = RDPGFX_CMDID_FRAMEACKNOWLEDGE;
	header.pduLength = RDPGFX_HEADER_SIZE + 12;
	WLog_Print(gfx->log, WLOG_DEBUG, "SendFrameAcknowledgePdu: %"PRIu32"", pdu->frameId);
	s = Stream_New(NULL, header.pduLength);

	if (!s)
	{
		WLog_ERR(TAG, "Stream_New failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	if ((error = rdpgfx_write_header(s, &header)))
		goto fail;

	/* RDPGFX_FRAME_ACKNOWLEDGE_PDU */
	Stream_Write_UINT32(s, pdu->queueDepth); /* queueDepth (4 bytes) */
	Stream_Write_UINT32(s, pdu->frameId); /* frameId (4 bytes) */
	Stream_Write_UINT32(s,
	                    pdu->totalFramesDecoded); /* totalFramesDecoded (4 bytes) */
	error = callback->channel->Write(callback->channel, (UINT32) Stream_Length(s),
	                                 Stream_Buffer(s), NULL);
fail:
	Stream_Free(s, TRUE);
	return error;
}

static UINT rdpgfx_send_qoe_frame_acknowledge_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        const RDPGFX_QOE_FRAME_ACKNOWLEDGE_PDU* pdu)
{
	UINT error;
	wStream* s;
	RDPGFX_HEADER header;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	header.flags = 0;
	header.cmdId = RDPGFX_CMDID_QOEFRAMEACKNOWLEDGE;
	header.pduLength = RDPGFX_HEADER_SIZE + 12;
	WLog_Print(gfx->log, WLOG_DEBUG, "SendQoeFrameAcknowledgePdu: %"PRIu32"", pdu->frameId);
	s = Stream_New(NULL, header.pduLength);

	if (!s)
	{
		WLog_ERR(TAG, "Stream_New failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	if ((error = rdpgfx_write_header(s, &header)))
		goto fail;

	/* RDPGFX_FRAME_ACKNOWLEDGE_PDU */
	Stream_Write_UINT32(s, pdu->frameId);
	Stream_Write_UINT32(s, pdu->timestamp);
	Stream_Write_UINT16(s, pdu->timeDiffSE);
	Stream_Write_UINT16(s, pdu->timeDiffEDR);
	error = callback->channel->Write(callback->channel, (UINT32) Stream_Length(s),
	                                 Stream_Buffer(s), NULL);
fail:
	Stream_Free(s, TRUE);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_reset_graphics_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	int pad;
	UINT32 index;
	MONITOR_DEF* monitor;
	RDPGFX_RESET_GRAPHICS_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;
	GraphicsResetEventArgs graphicsReset;

	if (Stream_GetRemainingLength(s) < 12)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT32(s, pdu.width); /* width (4 bytes) */
	Stream_Read_UINT32(s, pdu.height); /* height (4 bytes) */
	Stream_Read_UINT32(s, pdu.monitorCount); /* monitorCount (4 bytes) */

	if (Stream_GetRemainingLength(s) < (pdu.monitorCount * 20))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	pdu.monitorDefArray = (MONITOR_DEF*) calloc(pdu.monitorCount, sizeof(MONITOR_DEF));

	if (!pdu.monitorDefArray)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	for (index = 0; index < pdu.monitorCount; index++)
	{
		monitor = &(pdu.monitorDefArray[index]);
		Stream_Read_UINT32(s, monitor->left); /* left (4 bytes) */
		Stream_Read_UINT32(s, monitor->top); /* top (4 bytes) */
		Stream_Read_UINT32(s, monitor->right); /* right (4 bytes) */
		Stream_Read_UINT32(s, monitor->bottom); /* bottom (4 bytes) */
		Stream_Read_UINT32(s, monitor->flags); /* flags (4 bytes) */
	}

	pad = 340 - (RDPGFX_HEADER_SIZE + 12 + (pdu.monitorCount * 20));

	if (Stream_GetRemainingLength(s) < (size_t) pad)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "Stream_GetRemainingLength failed!");
		free(pdu.monitorDefArray);
		return CHANNEL_RC_NO_MEMORY;
	}

	Stream_Seek(s, pad); /* pad (total size is 340 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvResetGraphicsPdu: width: %"PRIu32" height: %"PRIu32" count: %"PRIu32"",
	           pdu.width, pdu.height, pdu.monitorCount);

	for (index = 0; index < pdu.monitorCount; index++)
	{
		monitor = &(pdu.monitorDefArray[index]);
		WLog_Print(gfx->log, WLOG_DEBUG,
		           "RecvResetGraphicsPdu: monitor left:%"PRIi32" top:%"PRIi32" right:%"PRIi32" left:%"PRIi32" flags:0x%"PRIx32"",
		           monitor->left, monitor->top, monitor->right, monitor->bottom, monitor->flags);
	}

	if (context)
	{
		IFCALLRET(context->ResetGraphics, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->ResetGraphics failed with error %"PRIu32"", error);
	}

	/* some listeners may be interested (namely the display channel) */
	EventArgsInit(&graphicsReset, "libfreerdp");
	graphicsReset.width = pdu.width;
	graphicsReset.height = pdu.height;
	PubSub_OnGraphicsReset(gfx->rdpcontext->pubSub, gfx->rdpcontext, &graphicsReset);
	free(pdu.monitorDefArray);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_evict_cache_entry_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_EVICT_CACHE_ENTRY_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 2)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.cacheSlot); /* cacheSlot (2 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG, "RecvEvictCacheEntryPdu: cacheSlot: %"PRIu16"", pdu.cacheSlot);

	if (context)
	{
		IFCALLRET(context->EvictCacheEntry, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->EvictCacheEntry failed with error %"PRIu32"", error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_cache_import_reply_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	UINT16 index;
	RDPGFX_CACHE_IMPORT_REPLY_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 2)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.importedEntriesCount); /* cacheSlot (2 bytes) */

	if (Stream_GetRemainingLength(s) < (size_t)(pdu.importedEntriesCount * 2))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	pdu.cacheSlots = (UINT16*) calloc(pdu.importedEntriesCount, sizeof(UINT16));

	if (!pdu.cacheSlots)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	for (index = 0; index < pdu.importedEntriesCount; index++)
	{
		Stream_Read_UINT16(s, pdu.cacheSlots[index]); /* cacheSlot (2 bytes) */
	}

	WLog_Print(gfx->log, WLOG_DEBUG, "RecvCacheImportReplyPdu: importedEntriesCount: %"PRIu16"",
	           pdu.importedEntriesCount);

	if (context)
	{
		IFCALLRET(context->CacheImportReply, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->CacheImportReply failed with error %"PRIu32"", error);
	}

	free(pdu.cacheSlots);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_create_surface_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_CREATE_SURFACE_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 7)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT16(s, pdu.width); /* width (2 bytes) */
	Stream_Read_UINT16(s, pdu.height); /* height (2 bytes) */
	Stream_Read_UINT8(s, pdu.pixelFormat); /* RDPGFX_PIXELFORMAT (1 byte) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvCreateSurfacePdu: surfaceId: %"PRIu16" width: %"PRIu16" height: %"PRIu16" pixelFormat: 0x%02"PRIX8"",
	           pdu.surfaceId, pdu.width, pdu.height, pdu.pixelFormat);

	if (context)
	{
		IFCALLRET(context->CreateSurface, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->CreateSurface failed with error %"PRIu32"", error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_delete_surface_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_DELETE_SURFACE_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 2)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG, "RecvDeleteSurfacePdu: surfaceId: %"PRIu16"", pdu.surfaceId);

	if (context)
	{
		IFCALLRET(context->DeleteSurface, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->DeleteSurface failed with error %"PRIu32"", error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_start_frame_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
                                        wStream* s)
{
	RDPGFX_START_FRAME_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < RDPGFX_START_FRAME_PDU_SIZE)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT32(s, pdu.timestamp); /* timestamp (4 bytes) */
	Stream_Read_UINT32(s, pdu.frameId); /* frameId (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG, "RecvStartFramePdu: frameId: %"PRIu32" timestamp: 0x%08"PRIX32"",
	           pdu.frameId, pdu.timestamp);
	gfx->StartDecodingTime = GetTickCountPrecise();

	if (context)
	{
		IFCALLRET(context->StartFrame, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->StartFrame failed with error %"PRIu32"", error);
	}

	gfx->UnacknowledgedFrames++;
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_end_frame_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
                                      wStream* s)
{
	RDPGFX_END_FRAME_PDU pdu;
	RDPGFX_FRAME_ACKNOWLEDGE_PDU ack;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < RDPGFX_END_FRAME_PDU_SIZE)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT32(s, pdu.frameId); /* frameId (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG, "RecvEndFramePdu: frameId: %"PRIu32"", pdu.frameId);

	if (context)
	{
		IFCALLRET(context->EndFrame, error, context, &pdu);

		if (error)
		{
			WLog_Print(gfx->log, WLOG_ERROR, "context->EndFrame failed with error %"PRIu32"", error);
			return error;
		}
	}

	gfx->UnacknowledgedFrames--;
	gfx->TotalDecodedFrames++;
	ack.frameId = pdu.frameId;
	ack.totalFramesDecoded = gfx->TotalDecodedFrames;

	if (gfx->sendFrameAcks)
	{
		if (gfx->suspendFrameAcks)
		{
			ack.queueDepth = SUSPEND_FRAME_ACKNOWLEDGEMENT;

			if (gfx->TotalDecodedFrames == 1)
				if ((error = rdpgfx_send_frame_acknowledge_pdu(context, &ack)))
					WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_send_frame_acknowledge_pdu failed with error %"PRIu32"",
					           error);
		}
		else
		{
			ack.queueDepth = QUEUE_DEPTH_UNAVAILABLE;

			if ((error = rdpgfx_send_frame_acknowledge_pdu(context, &ack)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_send_frame_acknowledge_pdu failed with error %"PRIu32"",
				           error);
		}
	}

	switch (gfx->ConnectionCaps.version)
	{
		case RDPGFX_CAPVERSION_10:
		case RDPGFX_CAPVERSION_102:
		case RDPGFX_CAPVERSION_103:
		case RDPGFX_CAPVERSION_104:
		case RDPGFX_CAPVERSION_105:
		case RDPGFX_CAPVERSION_106:
			if (gfx->SendQoeAck)
			{
				RDPGFX_QOE_FRAME_ACKNOWLEDGE_PDU qoe;
				UINT32 diff = (GetTickCountPrecise() - gfx->StartDecodingTime);

				if (diff > 65000)
					diff = 0;

				qoe.frameId = pdu.frameId;
				qoe.timestamp = gfx->StartDecodingTime;
				qoe.timeDiffSE = diff;
				qoe.timeDiffEDR = 1;

				if ((error = rdpgfx_send_qoe_frame_acknowledge_pdu(callback, &qoe)))
					WLog_Print(gfx->log, WLOG_ERROR,
					           "rdpgfx_send_qoe_frame_acknowledge_pdu failed with error %"PRIu32"",
					           error);
			}

			break;

		default:
			break;
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_wire_to_surface_1_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_SURFACE_COMMAND cmd;
	RDPGFX_WIRE_TO_SURFACE_PDU_1 pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	UINT error;

	if (Stream_GetRemainingLength(s) < RDPGFX_WIRE_TO_SURFACE_PDU_1_SIZE)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT16(s, pdu.codecId); /* codecId (2 bytes) */
	Stream_Read_UINT8(s, pdu.pixelFormat); /* pixelFormat (1 byte) */

	if ((error = rdpgfx_read_rect16(s, &(pdu.destRect)))) /* destRect (8 bytes) */
	{
		WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_rect16 failed with error %"PRIu32"", error);
		return error;
	}

	Stream_Read_UINT32(s, pdu.bitmapDataLength); /* bitmapDataLength (4 bytes) */

	if (pdu.bitmapDataLength > Stream_GetRemainingLength(s))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	pdu.bitmapData = Stream_Pointer(s);
	Stream_Seek(s, pdu.bitmapDataLength);
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvWireToSurface1Pdu: surfaceId: %"PRIu16" codecId: %s (0x%04"PRIX16") pixelFormat: 0x%02"PRIX8" "
	           "destRect: left: %"PRIu16" top: %"PRIu16" right: %"PRIu16" bottom: %"PRIu16" bitmapDataLength: %"PRIu32"",
	           pdu.surfaceId, rdpgfx_get_codec_id_string(pdu.codecId),
	           pdu.codecId, pdu.pixelFormat,
	           pdu.destRect.left, pdu.destRect.top,
	           pdu.destRect.right, pdu.destRect.bottom,
	           pdu.bitmapDataLength);
	cmd.surfaceId = pdu.surfaceId;
	cmd.codecId = pdu.codecId;
	cmd.contextId = 0;

	switch (pdu.pixelFormat)
	{
		case GFX_PIXEL_FORMAT_XRGB_8888:
			cmd.format = PIXEL_FORMAT_BGRX32;
			break;

		case GFX_PIXEL_FORMAT_ARGB_8888:
			cmd.format = PIXEL_FORMAT_BGRA32;
			break;

		default:
			return ERROR_INVALID_DATA;
	}

	cmd.left = pdu.destRect.left;
	cmd.top = pdu.destRect.top;
	cmd.right = pdu.destRect.right;
	cmd.bottom = pdu.destRect.bottom;
	cmd.width = cmd.right - cmd.left;
	cmd.height = cmd.bottom - cmd.top;
	cmd.length = pdu.bitmapDataLength;
	cmd.data = pdu.bitmapData;
	cmd.extra = NULL;

	if ((error = rdpgfx_decode(gfx, &cmd)))
		WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_decode failed with error %"PRIu32"!", error);

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_wire_to_surface_2_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_SURFACE_COMMAND cmd;
	RDPGFX_WIRE_TO_SURFACE_PDU_2 pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < RDPGFX_WIRE_TO_SURFACE_PDU_2_SIZE)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT16(s, pdu.codecId); /* codecId (2 bytes) */
	Stream_Read_UINT32(s, pdu.codecContextId); /* codecContextId (4 bytes) */
	Stream_Read_UINT8(s, pdu.pixelFormat); /* pixelFormat (1 byte) */
	Stream_Read_UINT32(s, pdu.bitmapDataLength); /* bitmapDataLength (4 bytes) */
	pdu.bitmapData = Stream_Pointer(s);
	Stream_Seek(s, pdu.bitmapDataLength);
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvWireToSurface2Pdu: surfaceId: %"PRIu16" codecId: %s (0x%04"PRIX16") "
	           "codecContextId: %"PRIu32" pixelFormat: 0x%02"PRIX8" bitmapDataLength: %"PRIu32"",
	           pdu.surfaceId, rdpgfx_get_codec_id_string(pdu.codecId), pdu.codecId,
	           pdu.codecContextId, pdu.pixelFormat, pdu.bitmapDataLength);
	cmd.surfaceId = pdu.surfaceId;
	cmd.codecId = pdu.codecId;
	cmd.contextId = pdu.codecContextId;

	switch (pdu.pixelFormat)
	{
		case GFX_PIXEL_FORMAT_XRGB_8888:
			cmd.format = PIXEL_FORMAT_BGRX32;
			break;

		case GFX_PIXEL_FORMAT_ARGB_8888:
			cmd.format = PIXEL_FORMAT_BGRA32;
			break;

		default:
			return ERROR_INVALID_DATA;
	}

	cmd.left = 0;
	cmd.top = 0;
	cmd.right = 0;
	cmd.bottom = 0;
	cmd.width = 0;
	cmd.height = 0;
	cmd.length = pdu.bitmapDataLength;
	cmd.data = pdu.bitmapData;
	cmd.extra = NULL;

	if (context)
	{
		IFCALLRET(context->SurfaceCommand, error, context, &cmd);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->SurfaceCommand failed with error %"PRIu32"", error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_delete_encoding_context_pdu(RDPGFX_CHANNEL_CALLBACK*
        callback, wStream* s)
{
	RDPGFX_DELETE_ENCODING_CONTEXT_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 6)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT32(s, pdu.codecContextId); /* codecContextId (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvDeleteEncodingContextPdu: surfaceId: %"PRIu16" codecContextId: %"PRIu32"",
	           pdu.surfaceId, pdu.codecContextId);

	if (context)
	{
		IFCALLRET(context->DeleteEncodingContext, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->DeleteEncodingContext failed with error %"PRIu32"",
			           error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_solid_fill_pdu(RDPGFX_CHANNEL_CALLBACK* callback, wStream* s)
{
	UINT16 index;
	RECTANGLE_16* fillRect;
	RDPGFX_SOLID_FILL_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error;

	if (Stream_GetRemainingLength(s) < 8)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */

	if ((error = rdpgfx_read_color32(s, &(pdu.fillPixel)))) /* fillPixel (4 bytes) */
	{
		WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_color32 failed with error %"PRIu32"!", error);
		return error;
	}

	Stream_Read_UINT16(s, pdu.fillRectCount); /* fillRectCount (2 bytes) */

	if (Stream_GetRemainingLength(s) < (size_t)(pdu.fillRectCount * 8))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	pdu.fillRects = (RECTANGLE_16*) calloc(pdu.fillRectCount, sizeof(RECTANGLE_16));

	if (!pdu.fillRects)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	for (index = 0; index < pdu.fillRectCount; index++)
	{
		fillRect = &(pdu.fillRects[index]);

		if ((error = rdpgfx_read_rect16(s, fillRect)))
		{
			WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_rect16 failed with error %"PRIu32"!", error);
			free(pdu.fillRects);
			return error;
		}
	}

	WLog_Print(gfx->log, WLOG_DEBUG, "RecvSolidFillPdu: surfaceId: %"PRIu16" fillRectCount: %"PRIu16"",
	           pdu.surfaceId, pdu.fillRectCount);

	if (context)
	{
		IFCALLRET(context->SolidFill, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->SolidFill failed with error %"PRIu32"", error);
	}

	free(pdu.fillRects);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_surface_to_surface_pdu(RDPGFX_CHANNEL_CALLBACK*
        callback, wStream* s)
{
	UINT16 index;
	RDPGFX_POINT16* destPt;
	RDPGFX_SURFACE_TO_SURFACE_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error;

	if (Stream_GetRemainingLength(s) < 14)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceIdSrc); /* surfaceIdSrc (2 bytes) */
	Stream_Read_UINT16(s, pdu.surfaceIdDest); /* surfaceIdDest (2 bytes) */

	if ((error = rdpgfx_read_rect16(s, &(pdu.rectSrc)))) /* rectSrc (8 bytes ) */
	{
		WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_rect16 failed with error %"PRIu32"!", error);
		return error;
	}

	Stream_Read_UINT16(s, pdu.destPtsCount); /* destPtsCount (2 bytes) */

	if (Stream_GetRemainingLength(s) < (size_t)(pdu.destPtsCount * 4))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	pdu.destPts = (RDPGFX_POINT16*) calloc(pdu.destPtsCount, sizeof(RDPGFX_POINT16));

	if (!pdu.destPts)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	for (index = 0; index < pdu.destPtsCount; index++)
	{
		destPt = &(pdu.destPts[index]);

		if ((error = rdpgfx_read_point16(s, destPt)))
		{
			WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_point16 failed with error %"PRIu32"!", error);
			free(pdu.destPts);
			return error;
		}
	}

	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvSurfaceToSurfacePdu: surfaceIdSrc: %"PRIu16" surfaceIdDest: %"PRIu16" "
	           "left: %"PRIu16" top: %"PRIu16" right: %"PRIu16" bottom: %"PRIu16" destPtsCount: %"PRIu16"",
	           pdu.surfaceIdSrc, pdu.surfaceIdDest,
	           pdu.rectSrc.left, pdu.rectSrc.top, pdu.rectSrc.right, pdu.rectSrc.bottom,
	           pdu.destPtsCount);

	if (context)
	{
		IFCALLRET(context->SurfaceToSurface, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->SurfaceToSurface failed with error %"PRIu32"", error);
	}

	free(pdu.destPts);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_surface_to_cache_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_SURFACE_TO_CACHE_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error;

	if (Stream_GetRemainingLength(s) < 20)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT64(s, pdu.cacheKey); /* cacheKey (8 bytes) */
	Stream_Read_UINT16(s, pdu.cacheSlot); /* cacheSlot (2 bytes) */

	if ((error = rdpgfx_read_rect16(s, &(pdu.rectSrc)))) /* rectSrc (8 bytes ) */
	{
		WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_rect16 failed with error %"PRIu32"!", error);
		return error;
	}

	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvSurfaceToCachePdu: surfaceId: %"PRIu16" cacheKey: 0x%016"PRIX64" cacheSlot: %"PRIu16" "
	           "left: %"PRIu16" top: %"PRIu16" right: %"PRIu16" bottom: %"PRIu16"",
	           pdu.surfaceId, pdu.cacheKey, pdu.cacheSlot,
	           pdu.rectSrc.left, pdu.rectSrc.top,
	           pdu.rectSrc.right, pdu.rectSrc.bottom);

	if (context)
	{
		IFCALLRET(context->SurfaceToCache, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->SurfaceToCache failed with error %"PRIu32"", error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_cache_to_surface_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	UINT16 index;
	RDPGFX_POINT16* destPt;
	RDPGFX_CACHE_TO_SURFACE_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 6)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.cacheSlot); /* cacheSlot (2 bytes) */
	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT16(s, pdu.destPtsCount); /* destPtsCount (2 bytes) */

	if (Stream_GetRemainingLength(s) < (size_t)(pdu.destPtsCount * 4))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	pdu.destPts = (RDPGFX_POINT16*) calloc(pdu.destPtsCount, sizeof(RDPGFX_POINT16));

	if (!pdu.destPts)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	for (index = 0; index < pdu.destPtsCount; index++)
	{
		destPt = &(pdu.destPts[index]);

		if ((error = rdpgfx_read_point16(s, destPt)))
		{
			WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_point16 failed with error %"PRIu32"", error);
			free(pdu.destPts);
			return error;
		}
	}

	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RdpGfxRecvCacheToSurfacePdu: cacheSlot: %"PRIu16" surfaceId: %"PRIu16" destPtsCount: %"PRIu16"",
	           pdu.cacheSlot, pdu.surfaceId, pdu.destPtsCount);

	if (context)
	{
		IFCALLRET(context->CacheToSurface, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->CacheToSurface failed with error %"PRIu32"", error);
	}

	free(pdu.destPts);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_map_surface_to_output_pdu(RDPGFX_CHANNEL_CALLBACK*
        callback, wStream* s)
{
	RDPGFX_MAP_SURFACE_TO_OUTPUT_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 12)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT16(s, pdu.reserved); /* reserved (2 bytes) */
	Stream_Read_UINT32(s, pdu.outputOriginX); /* outputOriginX (4 bytes) */
	Stream_Read_UINT32(s, pdu.outputOriginY); /* outputOriginY (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvMapSurfaceToOutputPdu: surfaceId: %"PRIu16" outputOriginX: %"PRIu32" outputOriginY: %"PRIu32"",
	           pdu.surfaceId, pdu.outputOriginX, pdu.outputOriginY);

	if (context)
	{
		IFCALLRET(context->MapSurfaceToOutput, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->MapSurfaceToOutput failed with error %"PRIu32"", error);
	}

	return error;
}

static UINT rdpgfx_recv_map_surface_to_scaled_output_pdu(RDPGFX_CHANNEL_CALLBACK*
        callback, wStream* s)
{
	RDPGFX_MAP_SURFACE_TO_SCALED_OUTPUT_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 20)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT16(s, pdu.reserved); /* reserved (2 bytes) */
	Stream_Read_UINT32(s, pdu.outputOriginX); /* outputOriginX (4 bytes) */
	Stream_Read_UINT32(s, pdu.outputOriginY); /* outputOriginY (4 bytes) */
	Stream_Read_UINT32(s, pdu.targetWidth); /* targetWidth (4 bytes) */
	Stream_Read_UINT32(s, pdu.targetHeight); /* targetHeight (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvMapSurfaceToScaledOutputPdu: surfaceId: %"PRIu16" outputOriginX: %"PRIu32" outputOriginY: %"PRIu32" targetWidth: %"PRIu32" targetHeight: %"PRIu32,
	           pdu.surfaceId, pdu.outputOriginX, pdu.outputOriginY, pdu.targetWidth, pdu.targetHeight);

	if (context)
	{
		IFCALLRET(context->MapSurfaceToScaledOutput, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->MapSurfaceToScaledOutput failed with error %"PRIu32"",
			           error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_map_surface_to_window_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_MAP_SURFACE_TO_WINDOW_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 18)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT64(s, pdu.windowId); /* windowId (8 bytes) */
	Stream_Read_UINT32(s, pdu.mappedWidth); /* mappedWidth (4 bytes) */
	Stream_Read_UINT32(s, pdu.mappedHeight); /* mappedHeight (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvMapSurfaceToWindowPdu: surfaceId: %"PRIu16" windowId: 0x%016"PRIX64" mappedWidth: %"PRIu32" mappedHeight: %"PRIu32"",
	           pdu.surfaceId, pdu.windowId, pdu.mappedWidth, pdu.mappedHeight);

	if (context && context->MapSurfaceToWindow)
	{
		IFCALLRET(context->MapSurfaceToWindow, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->MapSurfaceToWindow failed with error %"PRIu32"", error);
	}

	return error;
}

static UINT rdpgfx_recv_map_surface_to_scaled_window_pdu(RDPGFX_CHANNEL_CALLBACK* callback,
        wStream* s)
{
	RDPGFX_MAP_SURFACE_TO_SCALED_WINDOW_PDU pdu;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;

	if (Stream_GetRemainingLength(s) < 26)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "not enough data!");
		return ERROR_INVALID_DATA;
	}

	Stream_Read_UINT16(s, pdu.surfaceId); /* surfaceId (2 bytes) */
	Stream_Read_UINT64(s, pdu.windowId); /* windowId (8 bytes) */
	Stream_Read_UINT32(s, pdu.mappedWidth); /* mappedWidth (4 bytes) */
	Stream_Read_UINT32(s, pdu.mappedHeight); /* mappedHeight (4 bytes) */
	Stream_Read_UINT32(s, pdu.targetWidth); /* targetWidth (4 bytes) */
	Stream_Read_UINT32(s, pdu.targetHeight); /* targetHeight (4 bytes) */
	WLog_Print(gfx->log, WLOG_DEBUG,
	           "RecvMapSurfaceToScaledWindowPdu: surfaceId: %"PRIu16" windowId: 0x%016"PRIX64" mappedWidth: %"PRIu32" mappedHeight: %"PRIu32" targetWidth: %"PRIu32" targetHeight: %"PRIu32"",
	           pdu.surfaceId, pdu.windowId, pdu.mappedWidth, pdu.mappedHeight, pdu.targetWidth, pdu.targetHeight);

	if (context && context->MapSurfaceToScaledWindow)
	{
		IFCALLRET(context->MapSurfaceToScaledWindow, error, context, &pdu);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->MapSurfaceToScaledWindow failed with error %"PRIu32"",
			           error);
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_recv_pdu(RDPGFX_CHANNEL_CALLBACK* callback, wStream* s)
{
	size_t beg, end;
	RDPGFX_HEADER header;
	UINT error;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	beg = Stream_GetPosition(s);

	if ((error = rdpgfx_read_header(s, &header)))
	{
		WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_read_header failed with error %"PRIu32"!", error);
		return error;
	}

	WLog_Print(gfx->log, WLOG_DEBUG,
	           "cmdId: %s (0x%04"PRIX16") flags: 0x%04"PRIX16" pduLength: %"PRIu32"",
	           rdpgfx_get_cmd_id_string(header.cmdId), header.cmdId, header.flags,
	           header.pduLength);

	switch (header.cmdId)
	{
		case RDPGFX_CMDID_WIRETOSURFACE_1:
			if ((error = rdpgfx_recv_wire_to_surface_1_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_wire_to_surface_1_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_WIRETOSURFACE_2:
			if ((error = rdpgfx_recv_wire_to_surface_2_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_wire_to_surface_2_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_DELETEENCODINGCONTEXT:
			if ((error = rdpgfx_recv_delete_encoding_context_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR,
				           "rdpgfx_recv_delete_encoding_context_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_SOLIDFILL:
			if ((error = rdpgfx_recv_solid_fill_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_solid_fill_pdu failed with error %"PRIu32"!", error);

			break;

		case RDPGFX_CMDID_SURFACETOSURFACE:
			if ((error = rdpgfx_recv_surface_to_surface_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_surface_to_surface_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_SURFACETOCACHE:
			if ((error = rdpgfx_recv_surface_to_cache_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_surface_to_cache_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_CACHETOSURFACE:
			if ((error = rdpgfx_recv_cache_to_surface_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_cache_to_surface_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_EVICTCACHEENTRY:
			if ((error = rdpgfx_recv_evict_cache_entry_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_evict_cache_entry_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_CREATESURFACE:
			if ((error = rdpgfx_recv_create_surface_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_create_surface_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_DELETESURFACE:
			if ((error = rdpgfx_recv_delete_surface_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_delete_surface_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_STARTFRAME:
			if ((error = rdpgfx_recv_start_frame_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_start_frame_pdu failed with error %"PRIu32"!", error);

			break;

		case RDPGFX_CMDID_ENDFRAME:
			if ((error = rdpgfx_recv_end_frame_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_end_frame_pdu failed with error %"PRIu32"!", error);

			break;

		case RDPGFX_CMDID_RESETGRAPHICS:
			if ((error = rdpgfx_recv_reset_graphics_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_reset_graphics_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_MAPSURFACETOOUTPUT:
			if ((error = rdpgfx_recv_map_surface_to_output_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR,
				           "rdpgfx_recv_map_surface_to_output_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_CACHEIMPORTREPLY:
			if ((error = rdpgfx_recv_cache_import_reply_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_cache_import_reply_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_CAPSCONFIRM:
			if ((error = rdpgfx_recv_caps_confirm_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_caps_confirm_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_MAPSURFACETOWINDOW:
			if ((error = rdpgfx_recv_map_surface_to_window_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR,
				           "rdpgfx_recv_map_surface_to_window_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_MAPSURFACETOSCALEDWINDOW:
			if ((error = rdpgfx_recv_map_surface_to_scaled_window_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR,
				           "rdpgfx_recv_map_surface_to_scaled_window_pdu failed with error %"PRIu32"!",
				           error);

			break;

		case RDPGFX_CMDID_MAPSURFACETOSCALEDOUTPUT:
			if ((error = rdpgfx_recv_map_surface_to_scaled_output_pdu(callback, s)))
				WLog_Print(gfx->log, WLOG_ERROR,
				           "rdpgfx_recv_map_surface_to_scaled_output_pdu failed with error %"PRIu32"!",
				           error);

			break;

		default:
			error = CHANNEL_RC_BAD_PROC;
			break;
	}

	if (error)
	{
		WLog_Print(gfx->log, WLOG_ERROR,  "Error while parsing GFX cmdId: %s (0x%04"PRIX16")",
		           rdpgfx_get_cmd_id_string(header.cmdId), header.cmdId);
		return error;
	}

	end = Stream_GetPosition(s);

	if (end != (beg + header.pduLength))
	{
		WLog_Print(gfx->log, WLOG_ERROR,  "Unexpected gfx pdu end: Actual: %d, Expected: %"PRIu32"",
		           end, (beg + header.pduLength));
		Stream_SetPosition(s, (beg + header.pduLength));
	}

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_on_data_received(IWTSVirtualChannelCallback*
                                    pChannelCallback, wStream* data)
{
	wStream* s;
	int status = 0;
	UINT32 DstSize = 0;
	BYTE* pDstData = NULL;
	RDPGFX_CHANNEL_CALLBACK* callback = (RDPGFX_CHANNEL_CALLBACK*) pChannelCallback;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	UINT error = CHANNEL_RC_OK;
	status = zgfx_decompress(gfx->zgfx, Stream_Pointer(data), Stream_GetRemainingLength(data),
	                         &pDstData, &DstSize, 0);

	if (status < 0)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "zgfx_decompress failure! status: %d", status);
		return ERROR_INTERNAL_ERROR;
	}

	s = Stream_New(pDstData, DstSize);

	if (!s)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	while (Stream_GetPosition(s) < Stream_Length(s))
	{
		if ((error = rdpgfx_recv_pdu(callback, s)))
		{
			WLog_Print(gfx->log, WLOG_ERROR, "rdpgfx_recv_pdu failed with error %"PRIu32"!", error);
			break;
		}
	}

	Stream_Free(s, TRUE);
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_on_open(IWTSVirtualChannelCallback* pChannelCallback)
{
	RDPGFX_CHANNEL_CALLBACK* callback = (RDPGFX_CHANNEL_CALLBACK*) pChannelCallback;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;
	BOOL do_caps_advertise = TRUE;
	gfx->sendFrameAcks = TRUE;

	if (context)
	{
		IFCALLRET(context->OnOpen, error, context, &do_caps_advertise, &gfx->sendFrameAcks);

		if (error)
			WLog_Print(gfx->log, WLOG_ERROR, "context->OnOpen failed with error %"PRIu32"", error);
	}

	if (do_caps_advertise)
		error = rdpgfx_send_supported_caps(callback);

	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_on_close(IWTSVirtualChannelCallback* pChannelCallback)
{
	int count;
	int index;
	ULONG_PTR* pKeys = NULL;
	RDPGFX_CHANNEL_CALLBACK* callback = (RDPGFX_CHANNEL_CALLBACK*) pChannelCallback;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) callback->plugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	WLog_Print(gfx->log, WLOG_DEBUG, "OnClose");
	free(callback);
	gfx->UnacknowledgedFrames = 0;
	gfx->TotalDecodedFrames = 0;

	if (gfx->zgfx)
	{
		zgfx_context_free(gfx->zgfx);
		gfx->zgfx = zgfx_context_new(FALSE);

		if (!gfx->zgfx)
			return CHANNEL_RC_NO_MEMORY;
	}

	count = HashTable_GetKeys(gfx->SurfaceTable, &pKeys);

	for (index = 0; index < count; index++)
	{
		RDPGFX_DELETE_SURFACE_PDU pdu;
		pdu.surfaceId = ((UINT16) pKeys[index]) - 1;

		if (context && context->DeleteSurface)
		{
			context->DeleteSurface(context, &pdu);
		}
	}

	free(pKeys);

	for (index = 0; index < gfx->MaxCacheSlot; index++)
	{
		if (gfx->CacheSlots[index])
		{
			RDPGFX_EVICT_CACHE_ENTRY_PDU pdu;
			pdu.cacheSlot = (UINT16) index;

			if (context && context->EvictCacheEntry)
			{
				context->EvictCacheEntry(context, &pdu);
			}

			gfx->CacheSlots[index] = NULL;
		}
	}

	if (context)
	{
		IFCALL(context->OnClose, context);
	}

	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_on_new_channel_connection(IWTSListenerCallback*
        pListenerCallback,
        IWTSVirtualChannel* pChannel, BYTE* Data, BOOL* pbAccept,
        IWTSVirtualChannelCallback** ppCallback)
{
	RDPGFX_CHANNEL_CALLBACK* callback;
	RDPGFX_LISTENER_CALLBACK* listener_callback = (RDPGFX_LISTENER_CALLBACK*)pListenerCallback;
	callback = (RDPGFX_CHANNEL_CALLBACK*) calloc(1, sizeof(RDPGFX_CHANNEL_CALLBACK));

	if (!callback)
	{
		WLog_ERR(TAG, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	callback->iface.OnDataReceived = rdpgfx_on_data_received;
	callback->iface.OnOpen = rdpgfx_on_open;
	callback->iface.OnClose = rdpgfx_on_close;
	callback->plugin = listener_callback->plugin;
	callback->channel_mgr = listener_callback->channel_mgr;
	callback->channel = pChannel;
	listener_callback->channel_callback = callback;
	*ppCallback = (IWTSVirtualChannelCallback*) callback;
	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_plugin_initialize(IWTSPlugin* pPlugin,
                                     IWTSVirtualChannelManager* pChannelMgr)
{
	UINT error;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) pPlugin;
	gfx->listener_callback = (RDPGFX_LISTENER_CALLBACK*) calloc(1, sizeof(RDPGFX_LISTENER_CALLBACK));

	if (!gfx->listener_callback)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	gfx->listener_callback->iface.OnNewChannelConnection = rdpgfx_on_new_channel_connection;
	gfx->listener_callback->plugin = pPlugin;
	gfx->listener_callback->channel_mgr = pChannelMgr;
	error = pChannelMgr->CreateListener(pChannelMgr, RDPGFX_DVC_CHANNEL_NAME, 0,
	                                    (IWTSListenerCallback*) gfx->listener_callback, &(gfx->listener));
	gfx->listener->pInterface = gfx->iface.pInterface;
	WLog_Print(gfx->log, WLOG_DEBUG, "Initialize");
	return error;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_plugin_terminated(IWTSPlugin* pPlugin)
{
	int count;
	int index;
	ULONG_PTR* pKeys = NULL;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) pPlugin;
	RdpgfxClientContext* context = (RdpgfxClientContext*) gfx->iface.pInterface;
	UINT error = CHANNEL_RC_OK;
	WLog_Print(gfx->log, WLOG_DEBUG, "Terminated");

	if (gfx->listener_callback)
	{
		free(gfx->listener_callback);
		gfx->listener_callback = NULL;
	}

	if (gfx->zgfx)
	{
		zgfx_context_free(gfx->zgfx);
		gfx->zgfx = NULL;
	}

	count = HashTable_GetKeys(gfx->SurfaceTable, &pKeys);

	for (index = 0; index < count; index++)
	{
		RDPGFX_DELETE_SURFACE_PDU pdu;
		pdu.surfaceId = ((UINT16) pKeys[index]) - 1;

		if (context)
		{
			IFCALLRET(context->DeleteSurface, error, context, &pdu);

			if (error)
			{
				WLog_Print(gfx->log, WLOG_ERROR, "context->DeleteSurface failed with error %"PRIu32"", error);
				free(pKeys);
				free(context);
				free(gfx);
				return error;
			}
		}
	}

	free(pKeys);
	HashTable_Free(gfx->SurfaceTable);

	for (index = 0; index < gfx->MaxCacheSlot; index++)
	{
		if (gfx->CacheSlots[index])
		{
			RDPGFX_EVICT_CACHE_ENTRY_PDU pdu;
			pdu.cacheSlot = (UINT16) index;

			if (context)
			{
				IFCALLRET(context->EvictCacheEntry, error, context, &pdu);

				if (error)
				{
					WLog_Print(gfx->log, WLOG_ERROR, "context->EvictCacheEntry failed with error %"PRIu32"", error);
					free(context);
					free(gfx);
					return error;
				}
			}

			gfx->CacheSlots[index] = NULL;
		}
	}

	free(context);
	free(gfx);
	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_set_surface_data(RdpgfxClientContext* context,
                                    UINT16 surfaceId, void* pData)
{
	ULONG_PTR key;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) context->handle;
	key = ((ULONG_PTR) surfaceId) + 1;

	if (pData)
		HashTable_Add(gfx->SurfaceTable, (void*) key, pData);
	else
		HashTable_Remove(gfx->SurfaceTable, (void*) key);

	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_get_surface_ids(RdpgfxClientContext* context,
                                   UINT16** ppSurfaceIds, UINT16* count_out)
{
	int count;
	int index;
	UINT16* pSurfaceIds;
	ULONG_PTR* pKeys = NULL;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) context->handle;
	count = HashTable_GetKeys(gfx->SurfaceTable, &pKeys);

	if (count < 1)
	{
		*count_out = 0;
		return CHANNEL_RC_OK;
	}

	pSurfaceIds = (UINT16*) calloc(count, sizeof(UINT16));

	if (!pSurfaceIds)
	{
		WLog_Print(gfx->log, WLOG_ERROR, "calloc failed!");
		free(pKeys);
		return CHANNEL_RC_NO_MEMORY;
	}

	for (index = 0; index < count; index++)
	{
		pSurfaceIds[index] = pKeys[index] - 1;
	}

	free(pKeys);
	*ppSurfaceIds = pSurfaceIds;
	*count_out = (UINT16)count;
	return CHANNEL_RC_OK;
}

static void* rdpgfx_get_surface_data(RdpgfxClientContext* context,
                                     UINT16 surfaceId)
{
	ULONG_PTR key;
	void* pData = NULL;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) context->handle;
	key = ((ULONG_PTR) surfaceId) + 1;
	pData = HashTable_GetItemValue(gfx->SurfaceTable, (void*) key);
	return pData;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT rdpgfx_set_cache_slot_data(RdpgfxClientContext* context,
                                       UINT16 cacheSlot, void* pData)
{
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) context->handle;

	if (cacheSlot >= gfx->MaxCacheSlot)
	{
		WLog_ERR(TAG, "%s: invalid cache slot %"PRIu16" maxAllowed=%"PRIu16"", __FUNCTION__,
		         cacheSlot, gfx->MaxCacheSlot);
		return ERROR_INVALID_INDEX;
	}

	gfx->CacheSlots[cacheSlot] = pData;
	return CHANNEL_RC_OK;
}

static void* rdpgfx_get_cache_slot_data(RdpgfxClientContext* context, UINT16 cacheSlot)
{
	void* pData = NULL;
	RDPGFX_PLUGIN* gfx = (RDPGFX_PLUGIN*) context->handle;

	if (cacheSlot >= gfx->MaxCacheSlot)
	{
		WLog_ERR(TAG, "%s: invalid cache slot %"PRIu16" maxAllowed=%"PRIu16"", __FUNCTION__,
		         cacheSlot, gfx->MaxCacheSlot);
		return NULL;
	}

	pData = gfx->CacheSlots[cacheSlot];
	return pData;
}

#ifdef BUILTIN_CHANNELS
#define DVCPluginEntry		rdpgfx_DVCPluginEntry
#else
#define DVCPluginEntry		FREERDP_API DVCPluginEntry
#endif

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
UINT DVCPluginEntry(IDRDYNVC_ENTRY_POINTS* pEntryPoints)
{
	UINT error = CHANNEL_RC_OK;
	RDPGFX_PLUGIN* gfx;
	RdpgfxClientContext* context;
	gfx = (RDPGFX_PLUGIN*) pEntryPoints->GetPlugin(pEntryPoints, "rdpgfx");

	if (!gfx)
	{
		gfx = (RDPGFX_PLUGIN*) calloc(1, sizeof(RDPGFX_PLUGIN));

		if (!gfx)
		{
			WLog_ERR(TAG, "calloc failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		gfx->log = WLog_Get(TAG);

		if (!gfx->log)
		{
			free(gfx);
			WLog_ERR(TAG, "Failed to acquire reference to WLog %s", TAG);
			return ERROR_INTERNAL_ERROR;
		}

		gfx->settings = (rdpSettings*) pEntryPoints->GetRdpSettings(pEntryPoints);
		gfx->iface.Initialize = rdpgfx_plugin_initialize;
		gfx->iface.Connected = NULL;
		gfx->iface.Disconnected = NULL;
		gfx->iface.Terminated = rdpgfx_plugin_terminated;
		gfx->rdpcontext = ((freerdp*)gfx->settings->instance)->context;
		gfx->SurfaceTable = HashTable_New(TRUE);

		if (!gfx->SurfaceTable)
		{
			free(gfx);
			WLog_ERR(TAG, "HashTable_New failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		gfx->ThinClient = gfx->settings->GfxThinClient;
		gfx->SmallCache = gfx->settings->GfxSmallCache;
		gfx->Progressive = gfx->settings->GfxProgressive;
		gfx->ProgressiveV2 = gfx->settings->GfxProgressiveV2;
		gfx->H264 = gfx->settings->GfxH264;
		gfx->AVC444 = gfx->settings->GfxAVC444;
		gfx->SendQoeAck = gfx->settings->GfxSendQoeAck;
		gfx->capsFilter = gfx->settings->GfxCapsFilter;

		if (gfx->H264)
			gfx->SmallCache = TRUE;

		gfx->MaxCacheSlot = gfx->SmallCache ? 4096 : 25600;
		context = (RdpgfxClientContext*)calloc(1, sizeof(RdpgfxClientContext));

		if (!context)
		{
			free(gfx);
			WLog_ERR(TAG, "calloc failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		context->handle = (void*) gfx;
		context->GetSurfaceIds = rdpgfx_get_surface_ids;
		context->SetSurfaceData = rdpgfx_set_surface_data;
		context->GetSurfaceData = rdpgfx_get_surface_data;
		context->SetCacheSlotData = rdpgfx_set_cache_slot_data;
		context->GetCacheSlotData = rdpgfx_get_cache_slot_data;
		context->CapsAdvertise = rdpgfx_send_caps_advertise_pdu;
		context->FrameAcknowledge = rdpgfx_send_frame_acknowledge_pdu;
		gfx->iface.pInterface = (void*) context;
		gfx->zgfx = zgfx_context_new(FALSE);

		if (!gfx->zgfx)
		{
			free(gfx);
			free(context);
			WLog_ERR(TAG, "zgfx_context_new failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		error = pEntryPoints->RegisterPlugin(pEntryPoints, "rdpgfx", (IWTSPlugin*) gfx);
	}

	return error;
}