text: /**
   * FreeRDP: A Remote Desktop Protocol Implementation
   * Device Redirection Virtual Channel
   *
   * Copyright 2010-2011 Vic Lee
   * Copyright 2010-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
   * Copyright 2015 Thincast Technologies GmbH
   * Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@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 <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <winpr/crt.h>
  #include <winpr/stream.h>
  
  #include "rdpdr_main.h"
  #include "devman.h"
  #include "irp.h"
  
  /**
   * Function description
   *
   * @return 0 on success, otherwise a Win32 error code
   */
  static UINT irp_free(IRP* irp)
  {
  	if (!irp)
  		return CHANNEL_RC_OK;
  
  	Stream_Free(irp->input, TRUE);
  	Stream_Free(irp->output, TRUE);
  
  	_aligned_free(irp);
  	return CHANNEL_RC_OK;
  }
  
  /**
   * Function description
   *
   * @return 0 on success, otherwise a Win32 error code
   */
  static UINT irp_complete(IRP* irp)
  {
  	size_t pos;
  	rdpdrPlugin* rdpdr;
  	UINT error;
  
  	rdpdr = (rdpdrPlugin*)irp->devman->plugin;
  
  	pos = Stream_GetPosition(irp->output);
  	Stream_SetPosition(irp->output, RDPDR_DEVICE_IO_RESPONSE_LENGTH - 4);
  	Stream_Write_UINT32(irp->output, irp->IoStatus); /* IoStatus (4 bytes) */
  	Stream_SetPosition(irp->output, pos);
  
  	error = rdpdr_send(rdpdr, irp->output);
  	irp->output = NULL;
  
  	return irp_free(irp);
  }
  
  IRP* irp_new(DEVMAN* devman, wStream* s, UINT* error)
  {
  	IRP* irp;
  	DEVICE* device;
  	UINT32 DeviceId;
  
  	if (Stream_GetRemainingLength(s) < 20)
  	{
  		if (error)
  			*error = ERROR_INVALID_DATA;
  		return NULL;
  	}
  
  	Stream_Read_UINT32(s, DeviceId); /* DeviceId (4 bytes) */
  	device = devman_get_device_by_id(devman, DeviceId);
  
  	if (!device)
  	{
  		WLog_WARN(TAG, "devman_get_device_by_id failed!");
  		if (error)
  			*error = CHANNEL_RC_OK;
  
  		return NULL;
  	}
  
  	irp = (IRP*)_aligned_malloc(sizeof(IRP), MEMORY_ALLOCATION_ALIGNMENT);
  
  	if (!irp)
  	{
  		WLog_ERR(TAG, "_aligned_malloc failed!");
  		if (error)
  			*error = CHANNEL_RC_NO_MEMORY;
  		return NULL;
  	}
  
  	ZeroMemory(irp, sizeof(IRP));
  
  	irp->input = s;
  	irp->device = device;
  	irp->devman = devman;
  
  	Stream_Read_UINT32(s, irp->FileId);        /* FileId (4 bytes) */
  	Stream_Read_UINT32(s, irp->CompletionId);  /* CompletionId (4 bytes) */
  	Stream_Read_UINT32(s, irp->MajorFunction); /* MajorFunction (4 bytes) */
  	Stream_Read_UINT32(s, irp->MinorFunction); /* MinorFunction (4 bytes) */
  
  	irp->output = Stream_New(NULL, 256);
  	if (!irp->output)
  	{
  		WLog_ERR(TAG, "Stream_New failed!");
  		_aligned_free(irp);
  		if (error)
  			*error = CHANNEL_RC_NO_MEMORY;
  		return NULL;
  	}
  	Stream_Write_UINT16(irp->output, RDPDR_CTYP_CORE);                /* Component (2 bytes) */
  	Stream_Write_UINT16(irp->output, PAKID_CORE_DEVICE_IOCOMPLETION); /* PacketId (2 bytes) */
  	Stream_Write_UINT32(irp->output, DeviceId);                       /* DeviceId (4 bytes) */
  	Stream_Write_UINT32(irp->output, irp->CompletionId);              /* CompletionId (4 bytes) */
  	Stream_Write_UINT32(irp->output, 0);                              /* IoStatus (4 bytes) */
  
  	irp->Complete = irp_complete;
  	irp->Discard = irp_free;
  
  	irp->thread = NULL;
  	irp->cancelled = FALSE;
  
  	if (error)
  		*error = CHANNEL_RC_OK;
  
  	return irp;
  }
  