// to-do: TOO MANY compilation warnings. Fix them.

/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Windows Clipboard Redirection
 *
 * Copyright 2012 Jason Champion
 * Copyright 2014 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.
 */

#define CINTERFACE
#define COBJMACROS

#include <ole2.h>
#include <shlobj.h>
#include <windows.h>
#include <winuser.h>
#include <tchar.h>

#include <strsafe.h>

#include <windef.h>

#include "../cliprdr.h"

#define CLIPRDR_SVC_CHANNEL_NAME "cliprdr"

/**
 * Clipboard Formats
 */
#define CB_FORMAT_HTML 0xD010
#define CB_FORMAT_PNG 0xD011
#define CB_FORMAT_JPEG 0xD012
#define CB_FORMAT_GIF 0xD013
#define CB_FORMAT_TEXTURILIST 0xD014
#define CB_FORMAT_GNOMECOPIEDFILES 0xD015
#define CB_FORMAT_MATECOPIEDFILES 0xD016

/* CLIPRDR_HEADER.msgType */
#define CB_MONITOR_READY 0x0001
#define CB_FORMAT_LIST 0x0002
#define CB_FORMAT_LIST_RESPONSE 0x0003
#define CB_FORMAT_DATA_REQUEST 0x0004
#define CB_FORMAT_DATA_RESPONSE 0x0005
#define CB_TEMP_DIRECTORY 0x0006
#define CB_CLIP_CAPS 0x0007
#define CB_FILECONTENTS_REQUEST 0x0008
#define CB_FILECONTENTS_RESPONSE 0x0009
#define CB_LOCK_CLIPDATA 0x000A
#define CB_UNLOCK_CLIPDATA 0x000B

/* CLIPRDR_HEADER.msgFlags */
#define CB_RESPONSE_OK 0x0001
#define CB_RESPONSE_FAIL 0x0002
#define CB_ASCII_NAMES 0x0004

/* CLIPRDR_CAPS_SET.capabilitySetType */
#define CB_CAPSTYPE_GENERAL 0x0001

/* CLIPRDR_GENERAL_CAPABILITY.lengthCapability */
#define CB_CAPSTYPE_GENERAL_LEN 12

/* CLIPRDR_GENERAL_CAPABILITY.version */
#define CB_CAPS_VERSION_1 0x00000001
#define CB_CAPS_VERSION_2 0x00000002

/* CLIPRDR_GENERAL_CAPABILITY.generalFlags */
#define CB_USE_LONG_FORMAT_NAMES 0x00000002
#define CB_STREAM_FILECLIP_ENABLED 0x00000004
#define CB_FILECLIP_NO_FILE_PATHS 0x00000008
#define CB_CAN_LOCK_CLIPDATA 0x00000010
#define CB_HUGE_FILE_SUPPORT_ENABLED 0x00000020

/* File Contents Request Flags */
#define FILECONTENTS_SIZE 0x00000001
#define FILECONTENTS_RANGE 0x00000002

/* Special Clipboard Response Formats */

struct _CLIPRDR_MFPICT
{
	UINT32 mappingMode;
	UINT32 xExt;
	UINT32 yExt;
	UINT32 metaFileSize;
	BYTE *metaFileData;
};
typedef struct _CLIPRDR_MFPICT CLIPRDR_MFPICT;

struct _FORMAT_IDS
{
	UINT32 connID;
	UINT32 size;
	UINT32 *formats;
};
typedef struct _FORMAT_IDS FORMAT_IDS;

/* File Contents Request Flags */
#define FILECONTENTS_SIZE 0x00000001
#define FILECONTENTS_RANGE 0x00000002

#define CHANNEL_RC_OK 0
#define CHANNEL_RC_ALREADY_INITIALIZED 1
#define CHANNEL_RC_NOT_INITIALIZED 2
#define CHANNEL_RC_ALREADY_CONNECTED 3
#define CHANNEL_RC_NOT_CONNECTED 4
#define CHANNEL_RC_TOO_MANY_CHANNELS 5
#define CHANNEL_RC_BAD_CHANNEL 6
#define CHANNEL_RC_BAD_CHANNEL_HANDLE 7
#define CHANNEL_RC_NO_BUFFER 8
#define CHANNEL_RC_BAD_INIT_HANDLE 9
#define CHANNEL_RC_NOT_OPEN 10
#define CHANNEL_RC_BAD_PROC 11
#define CHANNEL_RC_NO_MEMORY 12
#define CHANNEL_RC_UNKNOWN_CHANNEL_NAME 13
#define CHANNEL_RC_ALREADY_OPEN 14
#define CHANNEL_RC_NOT_IN_VIRTUALCHANNELENTRY 15
#define CHANNEL_RC_NULL_DATA 16
#define CHANNEL_RC_ZERO_LENGTH 17
#define CHANNEL_RC_INVALID_INSTANCE 18
#define CHANNEL_RC_UNSUPPORTED_VERSION 19
#define CHANNEL_RC_INITIALIZATION_ERROR 20

#define TAG "windows"

#ifdef WITH_DEBUG_CLIPRDR
#define DEBUG_CLIPRDR(fmt, ...)                                                                  \
	fprintf(stderr, "DEBUG %s[%d] %s() " fmt "\n", __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
	fflush(stderr)
#else
#define DEBUG_CLIPRDR(fmt, ...) \
	do                          \
	{                           \
	} while (0)
#endif

typedef BOOL(WINAPI *fnAddClipboardFormatListener)(HWND hwnd);
typedef BOOL(WINAPI *fnRemoveClipboardFormatListener)(HWND hwnd);
typedef BOOL(WINAPI *fnGetUpdatedClipboardFormats)(PUINT lpuiFormats, UINT cFormats,
												   PUINT pcFormatsOut);

struct format_mapping
{
	UINT32 remote_format_id;
	UINT32 local_format_id;
	WCHAR *name;
};
typedef struct format_mapping formatMapping;

struct _CliprdrEnumFORMATETC
{
	IEnumFORMATETC iEnumFORMATETC;

	LONG m_lRefCount;
	LONG m_nIndex;
	LONG m_nNumFormats;
	FORMATETC *m_pFormatEtc;
};
typedef struct _CliprdrEnumFORMATETC CliprdrEnumFORMATETC;

struct _CliprdrStream
{
	IStream iStream;

	LONG m_lRefCount;
	ULONG m_lIndex;
	ULARGE_INTEGER m_lSize;
	ULARGE_INTEGER m_lOffset;
	FILEDESCRIPTORW m_Dsc;
	void *m_pData;
	UINT32 m_connID;
};
typedef struct _CliprdrStream CliprdrStream;

struct _CliprdrDataObject
{
	IDataObject iDataObject;

	LONG m_lRefCount;
	FORMATETC *m_pFormatEtc;
	STGMEDIUM *m_pStgMedium;
	ULONG m_nNumFormats;
	ULONG m_nStreams;
	IStream **m_pStream;
	void *m_pData;
	DWORD m_processID;
	UINT32 m_connID;
};
typedef struct _CliprdrDataObject CliprdrDataObject;

struct wf_clipboard
{
	// wfContext* wfc;
	// rdpChannels* channels;
	CliprdrClientContext *context;

	BOOL sync;
	UINT32 capabilities;

	// This flag is not really needed,
	// but we can use it to double confirm that files can only be pasted after `Ctrl+C`.
	// Not sure `is_file_descriptor_from_remote()` is engough to check all cases on all Windows.
	BOOL copied;

	size_t map_size;
	size_t map_capacity;
	formatMapping *format_mappings;

	UINT32 requestedFormatId;

	HWND hwnd;
	HANDLE hmem;
	HANDLE thread;
	HANDLE formatDataRespEvent;
	BOOL formatDataRespReceived;

	LPDATAOBJECT data_obj;
	HANDLE data_obj_mutex;

	ULONG req_fsize;
	char *req_fdata;
	HANDLE req_fevent;
	BOOL req_f_received;

	size_t nFiles;
	size_t file_array_size;
	WCHAR **file_names;
	size_t first_file_index;
	FILEDESCRIPTORW **fileDescriptor;

	BOOL legacyApi;
	HMODULE hUser32;
	HWND hWndNextViewer;
	fnAddClipboardFormatListener AddClipboardFormatListener;
	fnRemoveClipboardFormatListener RemoveClipboardFormatListener;
	fnGetUpdatedClipboardFormats GetUpdatedClipboardFormats;
};
typedef struct wf_clipboard wfClipboard;

#define WM_CLIPRDR_MESSAGE (WM_USER + 156)
#define OLE_SETCLIPBOARD 1
#define DELAYED_RENDERING 2

BOOL wf_cliprdr_init(wfClipboard *clipboard, CliprdrClientContext *cliprdr);
BOOL wf_cliprdr_uninit(wfClipboard *clipboard, CliprdrClientContext *cliprdr);
BOOL wf_do_empty_cliprdr(wfClipboard *clipboard);

static BOOL wf_create_file_obj(UINT32 *connID, wfClipboard *clipboard, IDataObject **ppDataObject);
static void wf_destroy_file_obj(IDataObject *instance);
static UINT32 get_remote_format_id(wfClipboard *clipboard, UINT32 local_format);
static UINT cliprdr_send_data_request(UINT32 connID, wfClipboard *clipboard, UINT32 format);
static UINT cliprdr_send_lock(wfClipboard *clipboard);
static UINT cliprdr_send_unlock(wfClipboard *clipboard);
static UINT cliprdr_send_request_filecontents(wfClipboard *clipboard, UINT32 connID, const void *streamid,
											  ULONG index, UINT32 flag, DWORD positionhigh,
											  DWORD positionlow, ULONG request);

static BOOL is_file_descriptor_from_remote();
static BOOL is_set_by_instance(wfClipboard *clipboard);

static void CliprdrDataObject_Delete(CliprdrDataObject *instance);

static CliprdrEnumFORMATETC *CliprdrEnumFORMATETC_New(ULONG nFormats, FORMATETC *pFormatEtc);
static void CliprdrEnumFORMATETC_Delete(CliprdrEnumFORMATETC *instance);

static void CliprdrStream_Delete(CliprdrStream *instance);

static BOOL try_open_clipboard(HWND hwnd)
{
	size_t x;
	for (x = 0; x < 10; x++)
	{
		if (OpenClipboard(hwnd))
			return TRUE;
		Sleep(10);
	}
	return FALSE;
}

/**
 * IStream
 */

static HRESULT STDMETHODCALLTYPE CliprdrStream_QueryInterface(IStream *This, REFIID riid,
															  void **ppvObject)
{
	if (ppvObject == NULL)
		return E_INVALIDARG;

	if (IsEqualIID(riid, &IID_IStream) || IsEqualIID(riid, &IID_IUnknown))
	{
		IStream_AddRef(This);
		*ppvObject = This;
		return S_OK;
	}
	else
	{
		*ppvObject = 0;
		return E_NOINTERFACE;
	}
}

static ULONG STDMETHODCALLTYPE CliprdrStream_AddRef(IStream *This)
{
	CliprdrStream *instance = (CliprdrStream *)This;

	if (!instance)
		return 0;

	return InterlockedIncrement(&instance->m_lRefCount);
}

static ULONG STDMETHODCALLTYPE CliprdrStream_Release(IStream *This)
{
	LONG count;
	CliprdrStream *instance = (CliprdrStream *)This;

	if (!instance)
		return 0;

	count = InterlockedDecrement(&instance->m_lRefCount);

	if (count == 0)
	{
		CliprdrStream_Delete(instance);
		return 0;
	}
	else
	{
		return count;
	}
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Read(IStream *This, void *pv, ULONG cb,
													ULONG *pcbRead)
{
	int ret;
	CliprdrStream *instance = (CliprdrStream *)This;
	wfClipboard *clipboard;

	if (!pv || !pcbRead || !instance)
		return E_INVALIDARG;

	clipboard = (wfClipboard *)instance->m_pData;
	*pcbRead = 0;

	if (instance->m_lOffset.QuadPart >= instance->m_lSize.QuadPart)
		return S_FALSE;

	ret = cliprdr_send_request_filecontents(clipboard, instance->m_connID, (void *)This, instance->m_lIndex,
											FILECONTENTS_RANGE, instance->m_lOffset.HighPart,
											instance->m_lOffset.LowPart, cb);

	if (ret < 0)
		return E_FAIL;

	if (clipboard->req_fdata)
	{
		CopyMemory(pv, clipboard->req_fdata, clipboard->req_fsize);
		free(clipboard->req_fdata);
		clipboard->req_fdata = NULL;
	}

	*pcbRead = clipboard->req_fsize;
	// Check overflow, can not be a real case
	if ((instance->m_lOffset.QuadPart + clipboard->req_fsize) < instance->m_lOffset.QuadPart) {
		// It's better to crash to release the explorer.exe
		// This is a critical error, because the explorer is waiting for the data
		// and the m_lOffset is wrong(overflowed)
		return S_FALSE;
	}
	instance->m_lOffset.QuadPart += clipboard->req_fsize;

	if (clipboard->req_fsize < cb)
		return S_FALSE;

	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Write(IStream *This, const void *pv, ULONG cb,
													 ULONG *pcbWritten)
{
	(void)This;
	(void)pv;
	(void)cb;
	(void)pcbWritten;
	return STG_E_ACCESSDENIED;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Seek(IStream *This, LARGE_INTEGER dlibMove,
													DWORD dwOrigin, ULARGE_INTEGER *plibNewPosition)
{
	ULONGLONG newoffset;
	CliprdrStream *instance = (CliprdrStream *)This;

	if (!instance)
		return E_INVALIDARG;

	newoffset = instance->m_lOffset.QuadPart;

	switch (dwOrigin)
	{
	case STREAM_SEEK_SET:
		newoffset = dlibMove.QuadPart;
		break;

	case STREAM_SEEK_CUR:
		newoffset += dlibMove.QuadPart;
		break;

	case STREAM_SEEK_END:
		newoffset = instance->m_lSize.QuadPart + dlibMove.QuadPart;
		break;

	default:
		return E_INVALIDARG;
	}

	if (newoffset < 0 || newoffset >= instance->m_lSize.QuadPart)
		return E_FAIL;

	instance->m_lOffset.QuadPart = newoffset;

	if (plibNewPosition)
		plibNewPosition->QuadPart = instance->m_lOffset.QuadPart;

	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_SetSize(IStream *This, ULARGE_INTEGER libNewSize)
{
	(void)This;
	(void)libNewSize;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_CopyTo(IStream *This, IStream *pstm,
													  ULARGE_INTEGER cb, ULARGE_INTEGER *pcbRead,
													  ULARGE_INTEGER *pcbWritten)
{
	(void)This;
	(void)pstm;
	(void)cb;
	(void)pcbRead;
	(void)pcbWritten;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Commit(IStream *This, DWORD grfCommitFlags)
{
	(void)This;
	(void)grfCommitFlags;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Revert(IStream *This)
{
	(void)This;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_LockRegion(IStream *This, ULARGE_INTEGER libOffset,
														  ULARGE_INTEGER cb, DWORD dwLockType)
{
	(void)This;
	(void)libOffset;
	(void)cb;
	(void)dwLockType;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_UnlockRegion(IStream *This, ULARGE_INTEGER libOffset,
															ULARGE_INTEGER cb, DWORD dwLockType)
{
	(void)This;
	(void)libOffset;
	(void)cb;
	(void)dwLockType;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Stat(IStream *This, STATSTG *pstatstg,
													DWORD grfStatFlag)
{
	CliprdrStream *instance = (CliprdrStream *)This;

	if (!instance)
		return E_INVALIDARG;

	if (pstatstg == NULL)
		return STG_E_INVALIDPOINTER;

	ZeroMemory(pstatstg, sizeof(STATSTG));

	switch (grfStatFlag)
	{
	case STATFLAG_DEFAULT:
		return STG_E_INSUFFICIENTMEMORY;

	case STATFLAG_NONAME:
		pstatstg->cbSize.QuadPart = instance->m_lSize.QuadPart;
		pstatstg->grfLocksSupported = LOCK_EXCLUSIVE;
		pstatstg->grfMode = GENERIC_READ;
		pstatstg->grfStateBits = 0;
		pstatstg->type = STGTY_STREAM;
		break;

	case STATFLAG_NOOPEN:
		return STG_E_INVALIDFLAG;

	default:
		return STG_E_INVALIDFLAG;
	}

	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrStream_Clone(IStream *This, IStream **ppstm)
{
	(void)This;
	(void)ppstm;
	return E_NOTIMPL;
}

static CliprdrStream *CliprdrStream_New(UINT32 connID, ULONG index, void *pData, const FILEDESCRIPTORW *dsc)
{
	IStream *iStream = NULL;
	BOOL success = FALSE;
	BOOL isDir = FALSE;
	CliprdrStream *instance = NULL;
	wfClipboard *clipboard = (wfClipboard *)pData;

	if (!(pData && dsc))
	{
		return NULL;
	}

	instance = (CliprdrStream *)calloc(1, sizeof(CliprdrStream));

	if (instance)
	{
		instance->m_Dsc = *dsc;
		iStream = &instance->iStream;
		iStream->lpVtbl = (IStreamVtbl *)calloc(1, sizeof(IStreamVtbl));

		if (iStream->lpVtbl)
		{
			iStream->lpVtbl->QueryInterface = CliprdrStream_QueryInterface;
			iStream->lpVtbl->AddRef = CliprdrStream_AddRef;
			iStream->lpVtbl->Release = CliprdrStream_Release;
			iStream->lpVtbl->Read = CliprdrStream_Read;
			iStream->lpVtbl->Write = CliprdrStream_Write;
			iStream->lpVtbl->Seek = CliprdrStream_Seek;
			iStream->lpVtbl->SetSize = CliprdrStream_SetSize;
			iStream->lpVtbl->CopyTo = CliprdrStream_CopyTo;
			iStream->lpVtbl->Commit = CliprdrStream_Commit;
			iStream->lpVtbl->Revert = CliprdrStream_Revert;
			iStream->lpVtbl->LockRegion = CliprdrStream_LockRegion;
			iStream->lpVtbl->UnlockRegion = CliprdrStream_UnlockRegion;
			iStream->lpVtbl->Stat = CliprdrStream_Stat;
			iStream->lpVtbl->Clone = CliprdrStream_Clone;
			instance->m_lRefCount = 1;
			instance->m_lIndex = index;
			instance->m_pData = pData;
			instance->m_lOffset.QuadPart = 0;
			instance->m_connID = connID;

			if (instance->m_Dsc.dwFlags & FD_ATTRIBUTES)
			{
				if (instance->m_Dsc.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
					isDir = TRUE;
			}

			if (((instance->m_Dsc.dwFlags & FD_FILESIZE) == 0) && !isDir)
			{
				/* get content size of this stream */
				if (cliprdr_send_request_filecontents(clipboard, instance->m_connID, (void *)instance,
													  instance->m_lIndex, FILECONTENTS_SIZE, 0, 0,
													  8) == CHANNEL_RC_OK)
				{
					success = TRUE;
				}

				if (clipboard->req_fdata != NULL)
				{
					instance->m_lSize.QuadPart = *((LONGLONG *)clipboard->req_fdata);
					free(clipboard->req_fdata);
					clipboard->req_fdata = NULL;
				}
			}
			else {
				instance->m_lSize.QuadPart =
				    ((UINT64)instance->m_Dsc.nFileSizeHigh << 32) | instance->m_Dsc.nFileSizeLow;
				success = TRUE;
			}
		}
	}

	if (!success)
	{
		CliprdrStream_Delete(instance);
		instance = NULL;
	}

	return instance;
}

void CliprdrStream_Delete(CliprdrStream *instance)
{
	if (instance)
	{
		free(instance->iStream.lpVtbl);
		instance->iStream.lpVtbl = NULL;
		free(instance);
	}
}

/**
 * IDataObject
 */

static LONG cliprdr_lookup_format(CliprdrDataObject *instance, FORMATETC *pFormatEtc)
{
	ULONG i;

	if (!instance || !pFormatEtc)
		return -1;

	for (i = 0; i < instance->m_nNumFormats; i++)
	{
		if ((pFormatEtc->tymed & instance->m_pFormatEtc[i].tymed) &&
			pFormatEtc->cfFormat == instance->m_pFormatEtc[i].cfFormat &&
			pFormatEtc->dwAspect & instance->m_pFormatEtc[i].dwAspect)
		{
			return (LONG)i;
		}
	}

	return -1;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_QueryInterface(IDataObject *This, REFIID riid,
																  void **ppvObject)
{
	(void)This;

	if (!ppvObject)
		return E_INVALIDARG;

	if (IsEqualIID(riid, &IID_IDataObject) || IsEqualIID(riid, &IID_IUnknown))
	{
		IDataObject_AddRef(This);
		*ppvObject = This;
		return S_OK;
	}
	else
	{
		*ppvObject = 0;
		return E_NOINTERFACE;
	}
}

static ULONG STDMETHODCALLTYPE CliprdrDataObject_AddRef(IDataObject *This)
{
	CliprdrDataObject *instance = (CliprdrDataObject *)This;

	if (!instance)
		return E_INVALIDARG;

	return InterlockedIncrement(&instance->m_lRefCount);
}

static ULONG STDMETHODCALLTYPE CliprdrDataObject_Release(IDataObject *This)
{
	LONG count;
	CliprdrDataObject *instance = (CliprdrDataObject *)This;

	if (!instance)
		return E_INVALIDARG;

	count = InterlockedDecrement(&instance->m_lRefCount);

	if (count == 0)
	{
		CliprdrDataObject_Delete(instance);
		return 0;
	}
	else
		return count;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_GetData(IDataObject *This, FORMATETC *pFormatEtc,
														   STGMEDIUM *pMedium)
{
	ULONG i;
	LONG idx;
	CliprdrDataObject *instance = (CliprdrDataObject *)This;
	wfClipboard *clipboard;

	if (!pFormatEtc || !pMedium || !instance)
		return E_INVALIDARG;

	// Not the same process id
	if (instance->m_processID != GetCurrentProcessId())
	{
		return E_INVALIDARG;
	}

	clipboard = (wfClipboard *)instance->m_pData;

	if (!clipboard)
		return E_INVALIDARG;

	// If `Ctrl+C` is not pressed yet, do not handle the file paste, and empty the clipboard.
	if (!clipboard->copied) {
		if (try_open_clipboard(clipboard->hwnd)) {
			EmptyClipboard();
			CloseClipboard();
		}
		return E_UNEXPECTED;
	}

	if ((idx = cliprdr_lookup_format(instance, pFormatEtc)) == -1)
	{
		// empty clipboard here?
		return DV_E_FORMATETC;
	}

	pMedium->tymed = instance->m_pFormatEtc[idx].tymed;
	pMedium->pUnkForRelease = 0;

	if (instance->m_pFormatEtc[idx].cfFormat == RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW))
	{
		// FILEGROUPDESCRIPTOR *dsc;
		FILEGROUPDESCRIPTORW *dsc;
		// DWORD remote_format_id = get_remote_format_id(clipboard, instance->m_pFormatEtc[idx].cfFormat);
		// FIXME: origin code may be failed here???
		if (cliprdr_send_data_request(instance->m_connID, clipboard, instance->m_pFormatEtc[idx].cfFormat) != 0)
		{
			return E_UNEXPECTED;
		}
		if (!clipboard->hmem)
		{
			return E_UNEXPECTED;
		}

		pMedium->hGlobal = clipboard->hmem; /* points to a FILEGROUPDESCRIPTOR structure */
		/* GlobalLock returns a pointer to the first byte of the memory block,
		 * in which is a FILEGROUPDESCRIPTOR structure, whose first UINT member
		 * is the number of FILEDESCRIPTOR's */
		// dsc = (FILEGROUPDESCRIPTOR *)GlobalLock(clipboard->hmem);
		dsc = (FILEGROUPDESCRIPTORW *)GlobalLock(clipboard->hmem);
		instance->m_nStreams = dsc->cItems;
		GlobalUnlock(clipboard->hmem);

		if (instance->m_nStreams > 0)
		{
			if (!instance->m_pStream)
			{
				instance->m_pStream = (LPSTREAM *)calloc(instance->m_nStreams, sizeof(LPSTREAM));

				if (instance->m_pStream)
				{
					for (i = 0; i < instance->m_nStreams; i++)
					{
						instance->m_pStream[i] =
							(IStream *)CliprdrStream_New(instance->m_connID, i, clipboard, &dsc->fgd[i]);

						if (!instance->m_pStream[i])
							return E_OUTOFMEMORY;
					}
				}
			}
		}

		if (!instance->m_pStream)
		{
			if (clipboard->hmem)
			{
				GlobalFree(clipboard->hmem);
				clipboard->hmem = NULL;
			}

			pMedium->hGlobal = NULL;
			return E_OUTOFMEMORY;
		}
	}
	else if (instance->m_pFormatEtc[idx].cfFormat == RegisterClipboardFormat(CFSTR_FILECONTENTS))
	{
		if ((pFormatEtc->lindex >= 0) && ((ULONG)pFormatEtc->lindex < instance->m_nStreams))
		{
			pMedium->pstm = instance->m_pStream[pFormatEtc->lindex];
			IDataObject_AddRef(instance->m_pStream[pFormatEtc->lindex]);
		}
		else
			return E_INVALIDARG;
	}
	else
		return E_UNEXPECTED;

	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_GetDataHere(IDataObject *This,
															   FORMATETC *pformatetc,
															   STGMEDIUM *pmedium)
{
	(void)This;
	(void)pformatetc;
	(void)pmedium;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_QueryGetData(IDataObject *This,
																FORMATETC *pformatetc)
{
	CliprdrDataObject *instance = (CliprdrDataObject *)This;

	if (!pformatetc)
		return E_INVALIDARG;

	if (cliprdr_lookup_format(instance, pformatetc) == -1)
		return DV_E_FORMATETC;

	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_GetCanonicalFormatEtc(IDataObject *This,
																		 FORMATETC *pformatetcIn,
																		 FORMATETC *pformatetcOut)
{
	(void)This;
	(void)pformatetcIn;

	if (!pformatetcOut)
		return E_INVALIDARG;

	pformatetcOut->ptd = NULL;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_SetData(IDataObject *This, FORMATETC *pformatetc,
														   STGMEDIUM *pmedium, BOOL fRelease)
{
	(void)This;
	(void)pformatetc;
	(void)pmedium;
	(void)fRelease;
	return E_NOTIMPL;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_EnumFormatEtc(IDataObject *This,
																 DWORD dwDirection,
																 IEnumFORMATETC **ppenumFormatEtc)
{
	CliprdrDataObject *instance = (CliprdrDataObject *)This;

	if (!instance || !ppenumFormatEtc)
		return E_INVALIDARG;

	if (dwDirection == DATADIR_GET)
	{
		*ppenumFormatEtc = (IEnumFORMATETC *)CliprdrEnumFORMATETC_New(instance->m_nNumFormats,
																	  instance->m_pFormatEtc);
		return (*ppenumFormatEtc) ? S_OK : E_OUTOFMEMORY;
	}
	else
	{
		return E_NOTIMPL;
	}
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_DAdvise(IDataObject *This, FORMATETC *pformatetc,
														   DWORD advf, IAdviseSink *pAdvSink,
														   DWORD *pdwConnection)
{
	(void)This;
	(void)pformatetc;
	(void)advf;
	(void)pAdvSink;
	(void)pdwConnection;
	return OLE_E_ADVISENOTSUPPORTED;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_DUnadvise(IDataObject *This, DWORD dwConnection)
{
	(void)This;
	(void)dwConnection;
	return OLE_E_ADVISENOTSUPPORTED;
}

static HRESULT STDMETHODCALLTYPE CliprdrDataObject_EnumDAdvise(IDataObject *This,
															   IEnumSTATDATA **ppenumAdvise)
{
	(void)This;
	(void)ppenumAdvise;
	return OLE_E_ADVISENOTSUPPORTED;
}

static CliprdrDataObject *CliprdrDataObject_New(UINT32 connID, FORMATETC *fmtetc, STGMEDIUM *stgmed, ULONG count,
												void *data)
{
	CliprdrDataObject *instance = NULL;
	IDataObject *iDataObject = NULL;
	instance = (CliprdrDataObject *)calloc(1, sizeof(CliprdrDataObject));

	if (!instance)
		goto error;

	instance->m_pFormatEtc = NULL;
	instance->m_pStgMedium = NULL;

	iDataObject = &instance->iDataObject;
	iDataObject->lpVtbl = NULL;
	iDataObject->lpVtbl = (IDataObjectVtbl *)calloc(1, sizeof(IDataObjectVtbl));

	if (!iDataObject->lpVtbl)
		goto error;

	iDataObject->lpVtbl->QueryInterface = CliprdrDataObject_QueryInterface;
	iDataObject->lpVtbl->AddRef = CliprdrDataObject_AddRef;
	iDataObject->lpVtbl->Release = CliprdrDataObject_Release;
	iDataObject->lpVtbl->GetData = CliprdrDataObject_GetData;
	iDataObject->lpVtbl->GetDataHere = CliprdrDataObject_GetDataHere;
	iDataObject->lpVtbl->QueryGetData = CliprdrDataObject_QueryGetData;
	iDataObject->lpVtbl->GetCanonicalFormatEtc = CliprdrDataObject_GetCanonicalFormatEtc;
	iDataObject->lpVtbl->SetData = CliprdrDataObject_SetData;
	iDataObject->lpVtbl->EnumFormatEtc = CliprdrDataObject_EnumFormatEtc;
	iDataObject->lpVtbl->DAdvise = CliprdrDataObject_DAdvise;
	iDataObject->lpVtbl->DUnadvise = CliprdrDataObject_DUnadvise;
	iDataObject->lpVtbl->EnumDAdvise = CliprdrDataObject_EnumDAdvise;
	instance->m_lRefCount = 1;
	instance->m_nNumFormats = count;
	instance->m_pData = data;
	instance->m_nStreams = 0;
	instance->m_pStream = NULL;
	instance->m_processID = GetCurrentProcessId();
	instance->m_connID = connID;

	if (count > 0)
	{
		ULONG i;
		instance->m_pFormatEtc = (FORMATETC *)calloc(count, sizeof(FORMATETC));

		if (!instance->m_pFormatEtc)
			goto error;

		instance->m_pStgMedium = (STGMEDIUM *)calloc(count, sizeof(STGMEDIUM));

		if (!instance->m_pStgMedium)
			goto error;

		for (i = 0; i < count; i++)
		{
			instance->m_pFormatEtc[i] = fmtetc[i];
			instance->m_pStgMedium[i] = stgmed[i];
		}
	}

	return instance;
error:
	if (iDataObject && iDataObject->lpVtbl)
	{
		free(iDataObject->lpVtbl);
	}
	if (instance)
	{
		if (instance->m_pFormatEtc)
		{
			free(instance->m_pFormatEtc);
		}

		if (instance->m_pStgMedium)
		{
			free(instance->m_pStgMedium);
		}

		CliprdrDataObject_Delete(instance);
	}
	return NULL;
}

void CliprdrDataObject_Delete(CliprdrDataObject *instance)
{
	if (instance)
	{
		free(instance->iDataObject.lpVtbl);
		free(instance->m_pFormatEtc);
		free(instance->m_pStgMedium);

		if (instance->m_pStream)
		{
			ULONG i;

			for (i = 0; i < instance->m_nStreams; i++)
				CliprdrStream_Release(instance->m_pStream[i]);

			free(instance->m_pStream);
		}

		free(instance);
	}
}

static BOOL wf_create_file_obj(UINT32 *connID, wfClipboard *clipboard, IDataObject **ppDataObject)
{
	FORMATETC fmtetc[2];
	STGMEDIUM stgmeds[2];

	if (!ppDataObject)
		return FALSE;

	fmtetc[0].cfFormat = RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
	fmtetc[0].dwAspect = DVASPECT_CONTENT;
	fmtetc[0].lindex = 0;
	fmtetc[0].ptd = NULL;
	fmtetc[0].tymed = TYMED_HGLOBAL;
	stgmeds[0].tymed = TYMED_HGLOBAL;
	stgmeds[0].hGlobal = NULL;
	stgmeds[0].pUnkForRelease = NULL;
	fmtetc[1].cfFormat = RegisterClipboardFormat(CFSTR_FILECONTENTS);
	fmtetc[1].dwAspect = DVASPECT_CONTENT;
	fmtetc[1].lindex = 0;
	fmtetc[1].ptd = NULL;
	fmtetc[1].tymed = TYMED_ISTREAM;
	stgmeds[1].tymed = TYMED_ISTREAM;
	stgmeds[1].pstm = NULL;
	stgmeds[1].pUnkForRelease = NULL;
	*ppDataObject = (IDataObject *)CliprdrDataObject_New(*connID, fmtetc, stgmeds, 2, clipboard);
	return (*ppDataObject) ? TRUE : FALSE;
}

static void wf_destroy_file_obj(IDataObject *instance)
{
	if (instance)
		IDataObject_Release(instance);
}

/**
 * IEnumFORMATETC
 */

static void cliprdr_format_deep_copy(FORMATETC *dest, FORMATETC *source)
{
	*dest = *source;

	if (source->ptd)
	{
		dest->ptd = (DVTARGETDEVICE *)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));

		if (dest->ptd)
			*(dest->ptd) = *(source->ptd);
	}
}

static HRESULT STDMETHODCALLTYPE CliprdrEnumFORMATETC_QueryInterface(IEnumFORMATETC *This,
																	 REFIID riid, void **ppvObject)
{
	(void)This;
	if (!ppvObject)
		return E_INVALIDARG;

	if (IsEqualIID(riid, &IID_IEnumFORMATETC) || IsEqualIID(riid, &IID_IUnknown))
	{
		IEnumFORMATETC_AddRef(This);
		*ppvObject = This;
		return S_OK;
	}
	else
	{
		*ppvObject = 0;
		return E_NOINTERFACE;
	}
}

static ULONG STDMETHODCALLTYPE CliprdrEnumFORMATETC_AddRef(IEnumFORMATETC *This)
{
	CliprdrEnumFORMATETC *instance = (CliprdrEnumFORMATETC *)This;

	if (!instance)
		return 0;

	return InterlockedIncrement(&instance->m_lRefCount);
}

static ULONG STDMETHODCALLTYPE CliprdrEnumFORMATETC_Release(IEnumFORMATETC *This)
{
	LONG count;
	CliprdrEnumFORMATETC *instance = (CliprdrEnumFORMATETC *)This;

	if (!instance)
		return 0;

	count = InterlockedDecrement(&instance->m_lRefCount);

	if (count == 0)
	{
		CliprdrEnumFORMATETC_Delete(instance);
		return 0;
	}
	else
	{
		return count;
	}
}

static HRESULT STDMETHODCALLTYPE CliprdrEnumFORMATETC_Next(IEnumFORMATETC *This, ULONG celt,
														   FORMATETC *rgelt, ULONG *pceltFetched)
{
	ULONG copied = 0;
	CliprdrEnumFORMATETC *instance = (CliprdrEnumFORMATETC *)This;

	if (!instance || !celt || !rgelt)
		return E_INVALIDARG;

	while ((instance->m_nIndex < instance->m_nNumFormats) && (copied < celt))
	{
		cliprdr_format_deep_copy(&rgelt[copied++], &instance->m_pFormatEtc[instance->m_nIndex++]);
	}

	if (pceltFetched != 0)
		*pceltFetched = copied;

	return (copied == celt) ? S_OK : E_FAIL;
}

static HRESULT STDMETHODCALLTYPE CliprdrEnumFORMATETC_Skip(IEnumFORMATETC *This, ULONG celt)
{
	CliprdrEnumFORMATETC *instance = (CliprdrEnumFORMATETC *)This;

	if (!instance)
		return E_INVALIDARG;

	if (instance->m_nIndex + (LONG)celt > instance->m_nNumFormats)
		return E_FAIL;

	instance->m_nIndex += celt;
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrEnumFORMATETC_Reset(IEnumFORMATETC *This)
{
	CliprdrEnumFORMATETC *instance = (CliprdrEnumFORMATETC *)This;

	if (!instance)
		return E_INVALIDARG;

	instance->m_nIndex = 0;
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE CliprdrEnumFORMATETC_Clone(IEnumFORMATETC *This,
															IEnumFORMATETC **ppEnum)
{
	CliprdrEnumFORMATETC *instance = (CliprdrEnumFORMATETC *)This;

	if (!instance || !ppEnum)
		return E_INVALIDARG;

	*ppEnum =
		(IEnumFORMATETC *)CliprdrEnumFORMATETC_New(instance->m_nNumFormats, instance->m_pFormatEtc);

	if (!*ppEnum)
		return E_OUTOFMEMORY;

	((CliprdrEnumFORMATETC *)*ppEnum)->m_nIndex = instance->m_nIndex;
	return S_OK;
}

CliprdrEnumFORMATETC *CliprdrEnumFORMATETC_New(ULONG nFormats, FORMATETC *pFormatEtc)
{
	ULONG i;
	CliprdrEnumFORMATETC *instance;
	IEnumFORMATETC *iEnumFORMATETC;

	if ((nFormats != 0) && !pFormatEtc)
		return NULL;

	instance = (CliprdrEnumFORMATETC *)calloc(1, sizeof(CliprdrEnumFORMATETC));

	if (!instance)
		goto error;

	iEnumFORMATETC = &instance->iEnumFORMATETC;
	iEnumFORMATETC->lpVtbl = (IEnumFORMATETCVtbl *)calloc(1, sizeof(IEnumFORMATETCVtbl));

	if (!iEnumFORMATETC->lpVtbl)
		goto error;

	iEnumFORMATETC->lpVtbl->QueryInterface = CliprdrEnumFORMATETC_QueryInterface;
	iEnumFORMATETC->lpVtbl->AddRef = CliprdrEnumFORMATETC_AddRef;
	iEnumFORMATETC->lpVtbl->Release = CliprdrEnumFORMATETC_Release;
	iEnumFORMATETC->lpVtbl->Next = CliprdrEnumFORMATETC_Next;
	iEnumFORMATETC->lpVtbl->Skip = CliprdrEnumFORMATETC_Skip;
	iEnumFORMATETC->lpVtbl->Reset = CliprdrEnumFORMATETC_Reset;
	iEnumFORMATETC->lpVtbl->Clone = CliprdrEnumFORMATETC_Clone;
	instance->m_lRefCount = 1;
	instance->m_nIndex = 0;
	instance->m_nNumFormats = nFormats;

	if (nFormats > 0)
	{
		instance->m_pFormatEtc = (FORMATETC *)calloc(nFormats, sizeof(FORMATETC));

		if (!instance->m_pFormatEtc)
			goto error;

		for (i = 0; i < nFormats; i++)
			cliprdr_format_deep_copy(&instance->m_pFormatEtc[i], &pFormatEtc[i]);
	}

	return instance;
error:
	CliprdrEnumFORMATETC_Delete(instance);
	return NULL;
}

void CliprdrEnumFORMATETC_Delete(CliprdrEnumFORMATETC *instance)
{
	LONG i;

	if (instance)
	{
		free(instance->iEnumFORMATETC.lpVtbl);

		if (instance->m_pFormatEtc)
		{
			for (i = 0; i < instance->m_nNumFormats; i++)
			{
				if (instance->m_pFormatEtc[i].ptd)
					CoTaskMemFree(instance->m_pFormatEtc[i].ptd);
			}

			free(instance->m_pFormatEtc);
		}

		free(instance);
	}
}

/***********************************************************************************/

static UINT32 get_local_format_id_by_name(wfClipboard *clipboard, const TCHAR *format_name)
{
	size_t i;
	formatMapping *map;
	WCHAR *unicode_name;
#if !defined(UNICODE)
	size_t size;
	int towchar_count;
#endif

	if (!clipboard || !format_name)
		return 0;

#if defined(UNICODE)
	unicode_name = _wcsdup(format_name);
	if (!unicode_name)
		return 0;
#else
	size = _tcslen(format_name);
	unicode_name = calloc(size + 1, sizeof(WCHAR));

	if (!unicode_name)
		return 0;

	towchar_count = MultiByteToWideChar(CP_OEMCP, 0, format_name, strlen(format_name), NULL, 0);
	if (towchar_count <= 0 || towchar_count > size)
		return 0;
	towchar_count = MultiByteToWideChar(CP_OEMCP, 0, format_name, strlen(format_name), unicode_name, size);
	if (towchar_count <= 0)
		return 0;
#endif

	for (i = 0; i < clipboard->map_size; i++)
	{
		map = &clipboard->format_mappings[i];

		if (map->name)
		{
			if (wcscmp(map->name, unicode_name) == 0)
			{
				free(unicode_name);
				return map->local_format_id;
			}
		}
	}

	free(unicode_name);
	return 0;
}

static BOOL file_transferring(wfClipboard *clipboard)
{
	return get_local_format_id_by_name(clipboard, CFSTR_FILEDESCRIPTORW) ? TRUE : FALSE;
}

static UINT32 get_remote_format_id(wfClipboard *clipboard, UINT32 local_format)
{
	UINT32 i;
	formatMapping *map;

	if (!clipboard)
		return 0;

	for (i = 0; i < clipboard->map_size; i++)
	{
		map = &clipboard->format_mappings[i];

		if (map->local_format_id == local_format)
			return map->remote_format_id;
	}

	return local_format;
}

static void map_ensure_capacity(wfClipboard *clipboard)
{
	if (!clipboard)
		return;

	if (clipboard->map_size >= clipboard->map_capacity)
	{
		size_t new_size;
		formatMapping *new_map;
		new_size = clipboard->map_capacity * 2;
		new_map =
			(formatMapping *)realloc(clipboard->format_mappings, sizeof(formatMapping) * new_size);

		if (!new_map)
			return;

		clipboard->format_mappings = new_map;
		clipboard->map_capacity = new_size;
	}
}

static BOOL clear_format_map(wfClipboard *clipboard)
{
	size_t i;
	formatMapping *map;

	if (!clipboard)
		return FALSE;

	if (clipboard->format_mappings)
	{
		for (i = 0; i < clipboard->map_capacity; i++)
		{
			map = &clipboard->format_mappings[i];
			map->remote_format_id = 0;
			map->local_format_id = 0;
			free(map->name);
			map->name = NULL;
		}
	}

	clipboard->map_size = 0;
	return TRUE;
}

static UINT cliprdr_send_tempdir(wfClipboard *clipboard)
{
	CLIPRDR_TEMP_DIRECTORY tempDirectory;

	if (!clipboard)
		return -1;

	// to-do:
	// Directly use the environment variable `TEMP` is not safe.
	// But this function is not used for now.
	if (GetEnvironmentVariableA("TEMP", tempDirectory.szTempDir, sizeof(tempDirectory.szTempDir)) ==
		0)
		return -1;

	return clipboard->context->TempDirectory(clipboard->context, &tempDirectory);
}

static BOOL cliprdr_GetUpdatedClipboardFormats(wfClipboard *clipboard, PUINT lpuiFormats,
											   UINT cFormats, PUINT pcFormatsOut)
{
	UINT index = 0;
	UINT format = 0;
	BOOL clipboardOpen = FALSE;

	if (!clipboard->legacyApi)
		return clipboard->GetUpdatedClipboardFormats(lpuiFormats, cFormats, pcFormatsOut);

	clipboardOpen = try_open_clipboard(clipboard->hwnd);

	if (!clipboardOpen)
	{
		*pcFormatsOut = 0;
		return TRUE; /* Other app holding clipboard */
	}

	while (index < cFormats)
	{
		format = EnumClipboardFormats(format);

		if (!format)
			break;

		lpuiFormats[index] = format;
		index++;
	}

	*pcFormatsOut = index;
	CloseClipboard();
	return TRUE;
}

static UINT cliprdr_send_format_list(wfClipboard *clipboard, UINT32 connID)
{
	UINT rc;
	int count = 0;
	UINT32 index;
	UINT32 numFormats = 0;
	UINT32 formatId = 0;
	char formatName[1024];
	CLIPRDR_FORMAT *formats = NULL;
	CLIPRDR_FORMAT_LIST formatList = {0};

	if (!clipboard)
		return ERROR_INTERNAL_ERROR;

	if (!IsClipboardFormatAvailable(CF_HDROP))
	{
		return ERROR_SUCCESS;
	}

	ZeroMemory(&formatList, sizeof(CLIPRDR_FORMAT_LIST));

	/* Ignore if other app is holding clipboard */
	if (try_open_clipboard(clipboard->hwnd))
	{
		// If current process is running as service with SYSTEM user.
		// Clipboard api works fine for text, but copying files works no good.
		// GetLastError() returns various error codes
		count = CountClipboardFormats();
		if (count == 0)
		{
			CloseClipboard();
			return CHANNEL_RC_NULL_DATA;
		}

		numFormats = (UINT32)count;
		formats = (CLIPRDR_FORMAT *)calloc(numFormats, sizeof(CLIPRDR_FORMAT));

		if (!formats)
		{
			CloseClipboard();
			return CHANNEL_RC_NO_MEMORY;
		}

		index = 0;
		// IsClipboardFormatAvailable(CF_HDROP) is checked above
		UINT fsid = RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
		UINT fcid = RegisterClipboardFormat(CFSTR_FILECONTENTS);
		formats[index++].formatId = fsid;
		formats[index++].formatId = fcid;
		numFormats = index;

		if (!CloseClipboard())
		{
			free(formats);
			return ERROR_INTERNAL_ERROR;
		}

		for (index = 0; index < numFormats; index++)
		{
			if (GetClipboardFormatNameA(formats[index].formatId, formatName, sizeof(formatName)))
			{
				formats[index].formatName = _strdup(formatName);
			}
			else
			{
				formats[index].formatName = NULL;
			}
		}
	}

	formatList.connID = connID;
	formatList.numFormats = numFormats;
	formatList.formats = formats;
	formatList.msgType = CB_FORMAT_LIST;

	// send
	rc = clipboard->context->ClientFormatList(clipboard->context, &formatList);
	// No need to check `rc`, `copied` is only used to indicate `Ctrl+C` is pressed.
	clipboard->copied = TRUE;

	for (index = 0; index < numFormats; index++)
	{
		if (formats[index].formatName != NULL)
		{
			free(formats[index].formatName);
			formats[index].formatName = NULL;
		}
	}
	free(formats);

	return rc;
}

// Ensure the event is not signaled, and reset it if it is.
UINT try_reset_event(HANDLE event)
{
	if (!event)
	{
		return ERROR_INTERNAL_ERROR;
	}

	DWORD result = WaitForSingleObject(event, 0);
	if (result == WAIT_OBJECT_0)
	{
		if (!ResetEvent(event))
		{
			return GetLastError();
		}
		else
		{
			return ERROR_SUCCESS;
		}
	}
	else if (result == WAIT_TIMEOUT)
	{
		return ERROR_SUCCESS;
	}
	else
	{
		return ERROR_INTERNAL_ERROR;
	}
}

UINT wait_response_event(UINT32 connID, wfClipboard *clipboard, HANDLE event, BOOL* recvedFlag, void **data)
{
	UINT rc = ERROR_SUCCESS;
	clipboard->context->IsStopped = FALSE;
	DWORD waitOnceTimeoutMillis = 50;
	int waitCount = 1000 * clipboard->context->ResponseWaitTimeoutSecs / waitOnceTimeoutMillis;
	int i = 0;
	for (; i < waitCount; i++)
	{
		DWORD waitRes = WaitForSingleObject(event, waitOnceTimeoutMillis);
		if (waitRes == WAIT_TIMEOUT && clipboard->context->IsStopped == FALSE)
		{
			if ((*recvedFlag) == TRUE) {
				// The data has been received, but the event is still not signaled.
				// We just skip the rest of the waiting and reset the flag.
				*recvedFlag = FALSE;
				// Explicitly set the waitRes to WAIT_OBJECT_0, because we have received the data.
				waitRes = WAIT_OBJECT_0;
			} else {
				// The data has not been received yet, we should continue to wait.
				continue;
			}
		}

		if (!ResetEvent(event))
		{
			// NOTE: critical error here, crash may be better
		}

		if (clipboard->context->IsStopped == TRUE)
		{
			wf_do_empty_cliprdr(clipboard);
			rc = ERROR_INTERNAL_ERROR;
		}

		if (waitRes != WAIT_OBJECT_0)
		{
			return ERROR_INTERNAL_ERROR;
		}

		if ((*data) == NULL)
		{
			rc = ERROR_INTERNAL_ERROR;
		}

		return rc;
	}

	if (i == waitCount)
	{
		NOTIFICATION_MESSAGE msg;
		msg.type = 2;
		msg.msg = "clipboard_wait_response_timeout_tip";
		msg.details = NULL;
		clipboard->context->NotifyClipboardMsg(connID, &msg);
		rc = ERROR_INTERNAL_ERROR;

		if (!ResetEvent(event))
		{
			// NOTE: critical error here, crash may be better
		}
	}
	else if ((*data) != NULL)
	{
		if (!ResetEvent(event))
		{
			// NOTE: critical error here, crash may be better
		}
		return ERROR_SUCCESS;
	}

	return ERROR_INTERNAL_ERROR;
}

static UINT cliprdr_send_data_request(UINT32 connID, wfClipboard *clipboard, UINT32 formatId)
{
	UINT rc;
	UINT32 remoteFormatId;
	CLIPRDR_FORMAT_DATA_REQUEST formatDataRequest;

	if (!clipboard || !clipboard->context || !clipboard->context->ClientFormatDataRequest)
		return ERROR_INTERNAL_ERROR;

	rc = try_reset_event(clipboard->formatDataRespEvent);
	if (rc != ERROR_SUCCESS)
	{
		return rc;
	}
	clipboard->formatDataRespReceived = FALSE;

	remoteFormatId = get_remote_format_id(clipboard, formatId);

	formatDataRequest.connID = connID;
	formatDataRequest.requestedFormatId = remoteFormatId;
	clipboard->requestedFormatId = formatId;
	rc = clipboard->context->ClientFormatDataRequest(clipboard->context, &formatDataRequest);
	if (rc != ERROR_SUCCESS)
	{
		return rc;
	}

	return wait_response_event(connID, clipboard, clipboard->formatDataRespEvent, &clipboard->formatDataRespReceived, &clipboard->hmem);
}

UINT cliprdr_send_request_filecontents(wfClipboard *clipboard, UINT32 connID, const void *streamid, ULONG index,
									   UINT32 flag, DWORD positionhigh, DWORD positionlow,
									   ULONG nreq)
{
	UINT rc;
	CLIPRDR_FILE_CONTENTS_REQUEST fileContentsRequest;

	if (!clipboard || !clipboard->context || !clipboard->context->ClientFileContentsRequest)
		return ERROR_INTERNAL_ERROR;

	rc = try_reset_event(clipboard->req_fevent);
	if (rc != ERROR_SUCCESS)
	{
		return rc;
	}
	clipboard->req_f_received = FALSE;

	fileContentsRequest.connID = connID;
	// streamId is `IStream*` pointer, though it is not very good on a 64-bit system.
	// But it is OK, because it is only used to check if the stream is the same in
	// `wf_cliprdr_server_file_contents_request()` function.
	fileContentsRequest.streamId = (UINT32)(ULONG_PTR)streamid;
	fileContentsRequest.listIndex = index;
	fileContentsRequest.dwFlags = flag;
	fileContentsRequest.nPositionLow = positionlow;
	fileContentsRequest.nPositionHigh = positionhigh;
	fileContentsRequest.cbRequested = nreq;
	fileContentsRequest.clipDataId = 0;
	fileContentsRequest.msgFlags = 0;
	rc = clipboard->context->ClientFileContentsRequest(clipboard->context, &fileContentsRequest);
	if (rc != ERROR_SUCCESS)
	{
		return rc;
	}

	return wait_response_event(connID, clipboard, clipboard->req_fevent, &clipboard->req_f_received, (void **)&clipboard->req_fdata);
}

static UINT cliprdr_send_response_filecontents(
	wfClipboard *clipboard,
	UINT32 connID,
	UINT16 msgFlags,
	UINT32 streamId,
	UINT32 size,
	BYTE *data)
{
	CLIPRDR_FILE_CONTENTS_RESPONSE fileContentsResponse;

	if (!clipboard || !clipboard->context || !clipboard->context->ClientFileContentsResponse)
	{
		data = NULL;
		size = 0;
		msgFlags = CB_RESPONSE_FAIL;
	}

	fileContentsResponse.connID = connID;
	fileContentsResponse.streamId = streamId;
	fileContentsResponse.cbRequested = size;
	fileContentsResponse.requestedData = data;
	fileContentsResponse.msgFlags = msgFlags;
	return clipboard->context->ClientFileContentsResponse(clipboard->context,
														  &fileContentsResponse);
}

static LRESULT CALLBACK cliprdr_proc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
	static wfClipboard *clipboard = NULL;

	switch (Msg)
	{
	case WM_CREATE:
		DEBUG_CLIPRDR("info: WM_CREATE");
		clipboard = (wfClipboard *)((CREATESTRUCT *)lParam)->lpCreateParams;
		clipboard->hwnd = hWnd;

		if (!clipboard->legacyApi)
			clipboard->AddClipboardFormatListener(hWnd);
		else
			clipboard->hWndNextViewer = SetClipboardViewer(hWnd);

		break;

	case WM_CLOSE:
		DEBUG_CLIPRDR("info: WM_CLOSE");

		if (!clipboard->legacyApi)
			clipboard->RemoveClipboardFormatListener(hWnd);

		break;

	case WM_DESTROY:
		if (clipboard->legacyApi)
			ChangeClipboardChain(hWnd, clipboard->hWndNextViewer);

		break;

	case WM_CLIPBOARDUPDATE:
		DEBUG_CLIPRDR("info: WM_CLIPBOARDUPDATE");
		// if (clipboard->sync)
		{
			if (!is_set_by_instance(clipboard))
			{
				if (clipboard->hmem)
				{
					GlobalFree(clipboard->hmem);
					clipboard->hmem = NULL;
				}

				cliprdr_send_format_list(clipboard, 0);
			}
		}

		break;

	case WM_RENDERALLFORMATS:
		DEBUG_CLIPRDR("info: WM_RENDERALLFORMATS");

		/* discard all contexts in clipboard */
		if (!try_open_clipboard(clipboard->hwnd))
		{
			DEBUG_CLIPRDR("OpenClipboard failed with 0x%x", GetLastError());
			break;
		}

		EmptyClipboard();
		CloseClipboard();
		break;

	case WM_RENDERFORMAT:
		DEBUG_CLIPRDR("info: WM_RENDERFORMAT");

		// https://docs.microsoft.com/en-us/windows/win32/dataxchg/wm-renderformat?redirectedfrom=MSDN
		// to-do: ensure usage of 0
		if (cliprdr_send_data_request(0, clipboard, (UINT32)wParam) != 0)
		{
			DEBUG_CLIPRDR("error: cliprdr_send_data_request failed.");
			break;
		}

		if (!SetClipboardData((UINT)wParam, clipboard->hmem))
		{
			DEBUG_CLIPRDR("SetClipboardData failed with 0x%x", GetLastError());

			if (clipboard->hmem)
			{
				GlobalFree(clipboard->hmem);
				clipboard->hmem = NULL;
			}
		}

		/* Note: GlobalFree() is not needed when success */
		break;

	case WM_DRAWCLIPBOARD:
		if (clipboard->legacyApi)
		{
			if ((GetClipboardOwner() != clipboard->hwnd) &&
				(S_FALSE == OleIsCurrentClipboard(clipboard->data_obj)))
			{
				cliprdr_send_format_list(clipboard, 0);
			}

			SendMessage(clipboard->hWndNextViewer, Msg, wParam, lParam);
		}

		break;

	case WM_CHANGECBCHAIN:
		if (clipboard->legacyApi)
		{
			HWND hWndCurrViewer = (HWND)wParam;
			HWND hWndNextViewer = (HWND)lParam;

			if (hWndCurrViewer == clipboard->hWndNextViewer)
				clipboard->hWndNextViewer = hWndNextViewer;
			else if (clipboard->hWndNextViewer)
				SendMessage(clipboard->hWndNextViewer, Msg, wParam, lParam);
		}

		break;

	case WM_CLIPRDR_MESSAGE:
		DEBUG_CLIPRDR("info: WM_CLIPRDR_MESSAGE");

		switch (wParam)
		{
		case OLE_SETCLIPBOARD:
			DEBUG_CLIPRDR("info: OLE_SETCLIPBOARD");

			if (WaitForSingleObject(clipboard->data_obj_mutex, INFINITE) != WAIT_OBJECT_0)
			{
				break;
			}

			if (clipboard->data_obj != NULL)
			{
				wf_destroy_file_obj(clipboard->data_obj);
				clipboard->data_obj = NULL;
			}
			if (wf_create_file_obj((UINT32 *)lParam, clipboard, &clipboard->data_obj))
			{
				HRESULT res = OleSetClipboard(clipboard->data_obj);
				if (res != S_OK)
				{
					wf_destroy_file_obj(clipboard->data_obj);
					clipboard->data_obj = NULL;
				}
			}
			free((void *)lParam);

			if (!ReleaseMutex(clipboard->data_obj_mutex))
			{
				// critical error!!!
			}

			break;

		case DELAYED_RENDERING:
			FORMAT_IDS *format_ids = (FORMAT_IDS *)lParam;
			if (!try_open_clipboard(clipboard->hwnd))
			{
				// failed to open clipboard
				free(format_ids->formats);
				free(format_ids);
				break;
			}

			for (UINT32 i = 0; i < format_ids->size; ++i)
			{
				if (cliprdr_send_data_request(format_ids->connID, clipboard, format_ids->formats[i]) != 0)
				{
					DEBUG_CLIPRDR("error: cliprdr_send_data_request failed.");
					continue;
				}

				if (!SetClipboardData(format_ids->formats[i], clipboard->hmem))
				{
					printf("SetClipboardData failed with 0x%x\n", GetLastError());
					DEBUG_CLIPRDR("SetClipboardData failed with 0x%x", GetLastError());

					if (clipboard->hmem)
					{
						GlobalFree(clipboard->hmem);
						clipboard->hmem = NULL;
					}
				}
			}

			if (!CloseClipboard() && GetLastError())
			{
				// failed to close clipboard?
			}

			free(format_ids->formats);
			free(format_ids);
			break;

		default:
			break;
		}

		break;

	case WM_DESTROYCLIPBOARD:
		// to-do: clear clipboard data?
	case WM_ASKCBFORMATNAME:
	case WM_HSCROLLCLIPBOARD:
	case WM_PAINTCLIPBOARD:
	case WM_SIZECLIPBOARD:
	case WM_VSCROLLCLIPBOARD:
	default:
		return DefWindowProc(hWnd, Msg, wParam, lParam);
	}

	return 0;
}

static int create_cliprdr_window(wfClipboard *clipboard)
{
	WNDCLASSEX wnd_cls;
	ZeroMemory(&wnd_cls, sizeof(WNDCLASSEX));
	wnd_cls.cbSize = sizeof(WNDCLASSEX);
	wnd_cls.style = CS_OWNDC;
	wnd_cls.lpfnWndProc = cliprdr_proc;
	wnd_cls.cbClsExtra = 0;
	wnd_cls.cbWndExtra = 0;
	wnd_cls.hIcon = NULL;
	wnd_cls.hCursor = NULL;
	wnd_cls.hbrBackground = NULL;
	wnd_cls.lpszMenuName = NULL;
	wnd_cls.lpszClassName = _T("ClipboardHiddenMessageProcessor");
	wnd_cls.hInstance = GetModuleHandle(NULL);
	wnd_cls.hIconSm = NULL;
	RegisterClassEx(&wnd_cls);
	clipboard->hwnd =
		CreateWindowEx(WS_EX_LEFT, _T("ClipboardHiddenMessageProcessor"), _T("rdpclip"), 0, 0, 0, 0,
					   0, HWND_MESSAGE, NULL, GetModuleHandle(NULL), clipboard);

	if (!clipboard->hwnd)
	{
		DEBUG_CLIPRDR("error: CreateWindowEx failed with %x.", GetLastError());
		return -1;
	}

	return 0;
}

static DWORD WINAPI cliprdr_thread_func(LPVOID arg)
{
	int ret;
	MSG msg;
	BOOL mcode;
	wfClipboard *clipboard = (wfClipboard *)arg;
	OleInitialize(0);

	if ((ret = create_cliprdr_window(clipboard)) != 0)
	{
		OleUninitialize();
		DEBUG_CLIPRDR("error: create clipboard window failed.");
		return 0;
	}

	while ((mcode = GetMessage(&msg, 0, 0, 0)) != 0)
	{
		if (mcode == -1)
		{
			DEBUG_CLIPRDR("error: clipboard thread GetMessage failed.");
			break;
		}
		else
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	OleUninitialize();
	return 0;
}

static void clear_file_array(wfClipboard *clipboard)
{
	size_t i;

	if (!clipboard)
		return;

	/* clear file_names array */
	if (clipboard->file_names)
	{
		for (i = 0; i < clipboard->nFiles; i++)
		{
			free(clipboard->file_names[i]);
			clipboard->file_names[i] = NULL;
		}

		free(clipboard->file_names);
		clipboard->file_names = NULL;
	}

	/* clear fileDescriptor array */
	if (clipboard->fileDescriptor)
	{
		for (i = 0; i < clipboard->nFiles; i++)
		{
			free(clipboard->fileDescriptor[i]);
			clipboard->fileDescriptor[i] = NULL;
		}

		free(clipboard->fileDescriptor);
		clipboard->fileDescriptor = NULL;
	}

	clipboard->file_array_size = 0;
	clipboard->nFiles = 0;
	clipboard->first_file_index = (size_t)-1;
}

static BOOL wf_cliprdr_get_file_contents(WCHAR *file_name, BYTE *buffer, LONG positionLow,
										 LONG positionHigh, DWORD nRequested, DWORD *puSize)
{
	BOOL res = FALSE;
	HANDLE hFile = NULL;
	DWORD nGet, rc;

	if (!file_name || !buffer || !puSize)
	{
		printf("get file contents Invalid Arguments.\n");
		return FALSE;
	}

	hFile = CreateFileW(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
						FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, NULL);

	if (hFile == INVALID_HANDLE_VALUE)
		return FALSE;

	rc = SetFilePointer(hFile, positionLow, &positionHigh, FILE_BEGIN);

	if (rc == INVALID_SET_FILE_POINTER)
		goto error;

	if (!ReadFile(hFile, buffer, nRequested, &nGet, NULL))
	{
		DEBUG_CLIPRDR("ReadFile failed with 0x%08lX.", GetLastError());
		goto error;
	}

	res = TRUE;
error:
	if (hFile)
	{
		if (!CloseHandle(hFile))
			res = FALSE;
	}

	if (res)
		*puSize = nGet;

	return res;
}

/* path_name has a '\' at the end. e.g. c:\newfolder\, file_name is c:\newfolder\new.txt */
static FILEDESCRIPTORW *wf_cliprdr_get_file_descriptor(WCHAR *file_name, size_t pathLen)
{
	HANDLE hFile = NULL;
	FILEDESCRIPTORW *fd = NULL;
	fd = (FILEDESCRIPTORW *)calloc(1, sizeof(FILEDESCRIPTORW));

	if (!fd)
		return NULL;

	hFile = CreateFileW(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
						FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, NULL);

	if (hFile == INVALID_HANDLE_VALUE)
	{
		free(fd);
		return NULL;
	}

	// to-do: use `fd->dwFlags = FD_ATTRIBUTES | FD_FILESIZE | FD_WRITESTIME | FD_PROGRESSUI`.
	// We keep `fd->dwFlags = FD_ATTRIBUTES | FD_WRITESTIME | FD_PROGRESSUI` for compatibility.
	// fd->dwFlags = FD_ATTRIBUTES | FD_FILESIZE | FD_WRITESTIME | FD_PROGRESSUI;
	fd->dwFlags = FD_ATTRIBUTES | FD_WRITESTIME | FD_PROGRESSUI;
	fd->dwFileAttributes = GetFileAttributesW(file_name);
	if (fd->dwFileAttributes == INVALID_FILE_ATTRIBUTES)
	{
		// TODO: debug handle some errors
	}

	if (!GetFileTime(hFile, NULL, NULL, &fd->ftLastWriteTime))
	{
		fd->dwFlags &= ~FD_WRITESTIME;
	}

	fd->nFileSizeLow = GetFileSize(hFile, &fd->nFileSizeHigh);
	if ((wcslen(file_name + pathLen) + 1) > sizeof(fd->cFileName) / sizeof(fd->cFileName[0]))
	{
		// The file name is too long, which is not a normal case.
		// So we just return NULL.
		CloseHandle(hFile);
		free(fd);
		return NULL;
	}

	wcsncpy_s(fd->cFileName, sizeof(fd->cFileName) / sizeof(fd->cFileName[0]), file_name + pathLen, wcslen(file_name + pathLen) + 1);
	CloseHandle(hFile);

	return fd;
}

static BOOL wf_cliprdr_array_ensure_capacity(wfClipboard *clipboard)
{
	if (!clipboard)
		return FALSE;

	if (clipboard->nFiles == clipboard->file_array_size)
	{
		size_t new_size;
		FILEDESCRIPTORW **new_fd;
		WCHAR **new_name;
		new_size = (clipboard->file_array_size + 1) * 2;
		new_fd = (FILEDESCRIPTORW **)realloc(clipboard->fileDescriptor,
											 new_size * sizeof(FILEDESCRIPTORW *));

		if (new_fd)
			clipboard->fileDescriptor = new_fd;

		new_name = (WCHAR **)realloc(clipboard->file_names, new_size * sizeof(WCHAR *));

		if (new_name)
			clipboard->file_names = new_name;

		if (!new_fd || !new_name)
			return FALSE;

		clipboard->file_array_size = new_size;
	}

	return TRUE;
}

static BOOL wf_cliprdr_add_to_file_arrays(wfClipboard *clipboard, WCHAR *full_file_name,
										  size_t pathLen)
{
	if (!wf_cliprdr_array_ensure_capacity(clipboard))
		return FALSE;

	/* add to name array */
	clipboard->file_names[clipboard->nFiles] = (LPWSTR)malloc((size_t)MAX_PATH * sizeof(WCHAR));

	if (!clipboard->file_names[clipboard->nFiles])
		return FALSE;

	// `MAX_PATH` is long enough for the file name.
	// So we just return FALSE if the file name is too long, which is not a normal case.
	if ((wcslen(full_file_name) + 1) > MAX_PATH)
		return FALSE;

	wcsncpy_s(clipboard->file_names[clipboard->nFiles], MAX_PATH, full_file_name, wcslen(full_file_name) + 1);
	/* add to descriptor array */
	clipboard->fileDescriptor[clipboard->nFiles] =
		wf_cliprdr_get_file_descriptor(full_file_name, pathLen);

	if (!clipboard->fileDescriptor[clipboard->nFiles])
	{
		free(clipboard->file_names[clipboard->nFiles]);
		return FALSE;
	}

	if ((clipboard->fileDescriptor[clipboard->nFiles]->dwFileAttributes &
		 FILE_ATTRIBUTE_DIRECTORY) == 0) {
		clipboard->first_file_index = clipboard->nFiles;
	}

	clipboard->nFiles++;
	return TRUE;
}

static BOOL wf_cliprdr_traverse_directory(wfClipboard *clipboard, WCHAR *Dir, size_t pathLen)
{
	HANDLE hFind;
	WCHAR DirSpec[MAX_PATH];
	WIN32_FIND_DATA FindFileData;

	if (!clipboard || !Dir)
		return FALSE;

	if (wcslen(Dir) + 3 > MAX_PATH)
		return FALSE;
	StringCchCopyW(DirSpec, MAX_PATH, Dir);
	StringCchCatW(DirSpec, MAX_PATH, L"\\*");

	// hFind = FindFirstFile(DirSpec, &FindFileData);
	hFind = FindFirstFileW(DirSpec, &FindFileData);

	if (hFind == INVALID_HANDLE_VALUE)
	{
		// printf("FindFirstFile failed with 0x%x.\n", GetLastError());
		DEBUG_CLIPRDR("FindFirstFile failed with 0x%x.", GetLastError());
		return FALSE;
	}

	while (FindNextFileW(hFind, &FindFileData))
	{
		// if ((FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0 &&
		//         wcscmp(FindFileData.cFileName, _T(".")) == 0 ||
		//     wcscmp(FindFileData.cFileName, _T("..")) == 0)
		if ((FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0 &&
				wcscmp(FindFileData.cFileName, L".") == 0 ||
			wcscmp(FindFileData.cFileName, L"..") == 0)
		{
			continue;
		}

		if ((FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
		{
			WCHAR DirAdd[MAX_PATH];
			if (wcslen(Dir) + wcslen(FindFileData.cFileName) + 2 > MAX_PATH)
				return FALSE;
			StringCchCopyW(DirAdd, MAX_PATH, Dir);
			StringCchCatW(DirAdd, MAX_PATH, L"\\");
			StringCchCatW(DirAdd, MAX_PATH, FindFileData.cFileName);

			if (!wf_cliprdr_add_to_file_arrays(clipboard, DirAdd, pathLen))
				return FALSE;

			if (!wf_cliprdr_traverse_directory(clipboard, DirAdd, pathLen))
				return FALSE;
		}
		else
		{
			WCHAR fileName[MAX_PATH];
			if (wcslen(Dir) + wcslen(FindFileData.cFileName) + 2 > MAX_PATH)
				return FALSE;
			StringCchCopyW(fileName, MAX_PATH, Dir);
			StringCchCatW(fileName, MAX_PATH, L"\\");
			StringCchCatW(fileName, MAX_PATH, FindFileData.cFileName);

			if (!wf_cliprdr_add_to_file_arrays(clipboard, fileName, pathLen))
				return FALSE;
		}
	}

	FindClose(hFind);
	return TRUE;
}

static UINT wf_cliprdr_send_client_capabilities(wfClipboard *clipboard)
{
	CLIPRDR_CAPABILITIES capabilities;
	CLIPRDR_GENERAL_CAPABILITY_SET generalCapabilitySet;

	if (!clipboard || !clipboard->context)
		return ERROR_INTERNAL_ERROR;

	// Ignore ClientCapabilities for now
	if (!clipboard->context->ClientCapabilities)
	{
		return CHANNEL_RC_OK;
	}

	capabilities.connID = 0;
	capabilities.cCapabilitiesSets = 1;
	capabilities.capabilitySets = (CLIPRDR_CAPABILITY_SET *)&(generalCapabilitySet);
	generalCapabilitySet.capabilitySetType = CB_CAPSTYPE_GENERAL;
	generalCapabilitySet.capabilitySetLength = 12;
	generalCapabilitySet.version = CB_CAPS_VERSION_2;
	generalCapabilitySet.generalFlags =
		CB_USE_LONG_FORMAT_NAMES | CB_STREAM_FILECLIP_ENABLED | CB_FILECLIP_NO_FILE_PATHS;
	return clipboard->context->ClientCapabilities(clipboard->context, &capabilities);
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT wf_cliprdr_monitor_ready(CliprdrClientContext *context,
									 const CLIPRDR_MONITOR_READY *monitorReady)
{
	UINT rc;
	wfClipboard *clipboard = (wfClipboard *)context->Custom;

	if (!context || !monitorReady)
		return ERROR_INTERNAL_ERROR;

	clipboard->sync = TRUE;
	rc = wf_cliprdr_send_client_capabilities(clipboard);

	if (rc != CHANNEL_RC_OK)
		return rc;

	return rc;
	// Don't send format list here, because we don't want to paste files copied before the connection.
	// return cliprdr_send_format_list(clipboard, monitorReady->connID);
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT wf_cliprdr_server_capabilities(CliprdrClientContext *context,
										   const CLIPRDR_CAPABILITIES *capabilities)
{
	UINT32 index;
	CLIPRDR_CAPABILITY_SET *capabilitySet;
	wfClipboard *clipboard = (wfClipboard *)context->Custom;

	if (!context || !capabilities)
		return ERROR_INTERNAL_ERROR;

	for (index = 0; index < capabilities->cCapabilitiesSets; index++)
	{
		capabilitySet = &(capabilities->capabilitySets[index]);

		if ((capabilitySet->capabilitySetType == CB_CAPSTYPE_GENERAL) &&
			(capabilitySet->capabilitySetLength >= CB_CAPSTYPE_GENERAL_LEN))
		{
			CLIPRDR_GENERAL_CAPABILITY_SET *generalCapabilitySet =
				(CLIPRDR_GENERAL_CAPABILITY_SET *)capabilitySet;
			clipboard->capabilities = generalCapabilitySet->generalFlags;
			break;
		}
	}

	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT wf_cliprdr_server_format_list(CliprdrClientContext *context,
										  const CLIPRDR_FORMAT_LIST *formatList)
{
	UINT rc = ERROR_INTERNAL_ERROR;
	UINT32 i;
	formatMapping *mapping;
	CLIPRDR_FORMAT *format;
	wfClipboard *clipboard = NULL;

	if (!context || !formatList)
		return ERROR_INTERNAL_ERROR;
	
	clipboard = (wfClipboard *)context->Custom;
	if (!clipboard)
		return ERROR_INTERNAL_ERROR;

	if (!clear_format_map(clipboard))
		return ERROR_INTERNAL_ERROR;

	clipboard->copied = TRUE;

	for (i = 0; i < formatList->numFormats; i++)
	{
		format = &(formatList->formats[i]);
		mapping = &(clipboard->format_mappings[i]);
		mapping->remote_format_id = format->formatId;

		if (format->formatName)
		{
			int size = MultiByteToWideChar(CP_UTF8, 0, format->formatName,
										   strlen(format->formatName), NULL, 0);
			mapping->name = calloc(size + 1, sizeof(WCHAR));

			if (mapping->name)
			{
				MultiByteToWideChar(CP_UTF8, 0, format->formatName, strlen(format->formatName),
									mapping->name, size);
				mapping->local_format_id = RegisterClipboardFormatW((LPWSTR)mapping->name);
			}
		}
		else
		{
			mapping->name = NULL;
			mapping->local_format_id = mapping->remote_format_id;
		}

		clipboard->map_size++;
		map_ensure_capacity(clipboard);
	}

	if (file_transferring(clipboard))
	{
		if (context->EnableFiles)
		{
			UINT32 *p_conn_id = (UINT32 *)calloc(1, sizeof(UINT32));
			if (p_conn_id) {
				*p_conn_id = formatList->connID;
				if (PostMessage(clipboard->hwnd, WM_CLIPRDR_MESSAGE, OLE_SETCLIPBOARD, p_conn_id))
					rc = CHANNEL_RC_OK;
			}
		}
		else
		{
			rc = CHANNEL_RC_OK;
		}
	}
	else
	{
		if (context->EnableOthers)
		{
			if (!try_open_clipboard(clipboard->hwnd))
				return CHANNEL_RC_OK; /* Ignore, other app holding clipboard */

			if (EmptyClipboard())
			{
				// Modified: do not apply delayed rendering
				// for (i = 0; i < (UINT32)clipboard->map_size; i++)
				//    SetClipboardData(clipboard->format_mappings[i].local_format_id, NULL);

				FORMAT_IDS *format_ids = (FORMAT_IDS *)calloc(1, sizeof(FORMAT_IDS));
				if (format_ids)
				{
					format_ids->connID = formatList->connID;
					format_ids->size = (UINT32)clipboard->map_size;
					format_ids->formats = (UINT32 *)calloc(format_ids->size, sizeof(UINT32));
					if (format_ids->formats)
					{
						for (i = 0; i < format_ids->size; ++i)
						{
							format_ids->formats[i] = clipboard->format_mappings[i].local_format_id;
						}
						if (PostMessage(clipboard->hwnd, WM_CLIPRDR_MESSAGE, DELAYED_RENDERING, format_ids))
						{
							rc = CHANNEL_RC_OK;
						}
						else
						{
							rc = ERROR_INTERNAL_ERROR;
						}
					}
					else
					{
						rc = ERROR_INTERNAL_ERROR;
					}
				}
				else
				{
					rc = ERROR_INTERNAL_ERROR;
				}
			}

			if (!CloseClipboard() && GetLastError())
				return ERROR_INTERNAL_ERROR;
		}
		else
		{
			rc = CHANNEL_RC_OK;
		}
	}

	return rc;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_format_list_response(CliprdrClientContext *context,
									   const CLIPRDR_FORMAT_LIST_RESPONSE *formatListResponse)
{
	(void)context;
	(void)formatListResponse;

	if (formatListResponse->msgFlags != CB_RESPONSE_OK)
		return E_FAIL;

	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_lock_clipboard_data(CliprdrClientContext *context,
									  const CLIPRDR_LOCK_CLIPBOARD_DATA *lockClipboardData)
{
	(void)context;
	(void)lockClipboardData;
	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_unlock_clipboard_data(CliprdrClientContext *context,
										const CLIPRDR_UNLOCK_CLIPBOARD_DATA *unlockClipboardData)
{
	(void)context;
	(void)unlockClipboardData;
	return CHANNEL_RC_OK;
}

static BOOL wf_cliprdr_process_filename(wfClipboard *clipboard, WCHAR *wFileName, size_t str_len)
{
	size_t pathLen;
	size_t offset = str_len;

	if (!clipboard || !wFileName)
		return FALSE;

	/* find the last '\' in full file name */
	while (offset > 0)
	{
		if (wFileName[offset] == L'\\')
			break;
		else
			offset--;
	}

	pathLen = offset + 1;

	if (!wf_cliprdr_add_to_file_arrays(clipboard, wFileName, pathLen))
		return FALSE;

	if ((clipboard->fileDescriptor[clipboard->nFiles - 1]->dwFileAttributes &
		 FILE_ATTRIBUTE_DIRECTORY) != 0)
	{
		/* this is a directory */
		if (!wf_cliprdr_traverse_directory(clipboard, wFileName, pathLen))
			return FALSE;
	}

	return TRUE;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_format_data_request(CliprdrClientContext *context,
									  const CLIPRDR_FORMAT_DATA_REQUEST *formatDataRequest)
{
	UINT rc = ERROR_SUCCESS;
	size_t size = 0;
	void *buff = NULL;
	char *globlemem = NULL;
	HANDLE hClipdata = NULL;
	UINT32 requestedFormatId;
	CLIPRDR_FORMAT_DATA_RESPONSE response;
	wfClipboard *clipboard;

	if (!context || !formatDataRequest)
	{
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	clipboard = (wfClipboard *)context->Custom;

	if (!clipboard)
	{
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	requestedFormatId = formatDataRequest->requestedFormatId;

	if (requestedFormatId == RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW))
	{
		size_t len;
		size_t i;
		WCHAR *wFileName;
		HRESULT result;
		LPDATAOBJECT dataObj;
		FORMATETC format_etc;
		STGMEDIUM stg_medium;
		DROPFILES *dropFiles;
		FILEGROUPDESCRIPTORW *groupDsc;
		result = OleGetClipboard(&dataObj);

		if (FAILED(result))
		{
			rc = ERROR_INTERNAL_ERROR;
			goto exit;
		}

		ZeroMemory(&format_etc, sizeof(FORMATETC));
		ZeroMemory(&stg_medium, sizeof(STGMEDIUM));
		/* get DROPFILES struct from OLE */
		format_etc.cfFormat = CF_HDROP;
		format_etc.tymed = TYMED_HGLOBAL;
		format_etc.dwAspect = 1;
		format_etc.lindex = -1;
		result = IDataObject_GetData(dataObj, &format_etc, &stg_medium);

		if (FAILED(result))
		{
			rc = ERROR_INTERNAL_ERROR;
			goto exit;
		}

		dropFiles = (DROPFILES *)GlobalLock(stg_medium.hGlobal);

		if (!dropFiles)
		{
			GlobalUnlock(stg_medium.hGlobal);
			ReleaseStgMedium(&stg_medium);
			clipboard->nFiles = 0;
			goto resp;
		}

		clear_file_array(clipboard);

		if (dropFiles->fWide)
		{
			/* dropFiles contains file names */
			for (wFileName = (WCHAR *)((char *)dropFiles + dropFiles->pFiles);
				 (len = wcslen(wFileName)) > 0; wFileName += len + 1)
			{
				wf_cliprdr_process_filename(clipboard, wFileName, wcslen(wFileName));
			}
		}
		else
		{
			char *p;
			for (p = (char *)((char *)dropFiles + dropFiles->pFiles); (len = strlen(p)) > 0;
				 p += len + 1, clipboard->nFiles++)
			{
				int cchWideChar;
				cchWideChar = MultiByteToWideChar(CP_ACP, MB_COMPOSITE, p, len, NULL, 0);
				wFileName = (LPWSTR)calloc(cchWideChar, sizeof(WCHAR));
				if (wFileName)
				{
					MultiByteToWideChar(CP_ACP, MB_COMPOSITE, p, len, wFileName, cchWideChar);
					wf_cliprdr_process_filename(clipboard, wFileName, cchWideChar);
					free(wFileName);
				}
				else
				{
					rc = ERROR_INTERNAL_ERROR;
					GlobalUnlock(stg_medium.hGlobal);
					ReleaseStgMedium(&stg_medium);
					goto exit;
				}
			}
		}

		GlobalUnlock(stg_medium.hGlobal);
		ReleaseStgMedium(&stg_medium);
	resp:
		// size will not overflow, because size type is size_t (unsigned __int64)
		size = 4 + clipboard->nFiles * sizeof(FILEDESCRIPTORW);
		groupDsc = (FILEGROUPDESCRIPTORW *)malloc(size);

		if (groupDsc)
		{
			groupDsc->cItems = clipboard->nFiles;

			for (i = 0; i < clipboard->nFiles; i++)
			{
				if (clipboard->fileDescriptor[i])
					groupDsc->fgd[i] = *clipboard->fileDescriptor[i];
			}

			buff = groupDsc;
		}

		IDataObject_Release(dataObj);
		rc = ERROR_SUCCESS;
	}
	else
	{
		/* Ignore if other app is holding the clipboard */
		if (try_open_clipboard(clipboard->hwnd))
		{
			hClipdata = GetClipboardData(requestedFormatId);

			if (!hClipdata)
			{
				CloseClipboard();
				{
					rc = ERROR_INTERNAL_ERROR;
					goto exit;
				}
			}
			else
			{
				globlemem = (char *)GlobalLock(hClipdata);
				size = (int)GlobalSize(hClipdata);
				buff = malloc(size);
				if (buff)
				{
					CopyMemory(buff, globlemem, size);
					rc = ERROR_SUCCESS;
				}
				else
				{
					rc = ERROR_INTERNAL_ERROR;
				}
				GlobalUnlock(hClipdata);
				CloseClipboard();
			}
		}
		else
		{
			rc = ERROR_INTERNAL_ERROR;
		}
	}

exit:
	if (rc == ERROR_SUCCESS)
	{
		response.msgFlags = CB_RESPONSE_OK;
	}
	else
	{
		response.msgFlags = CB_RESPONSE_FAIL;
	}
	response.connID = formatDataRequest->connID;
	response.dataLen = size;
	response.requestedFormatData = (BYTE *)buff;
	if (ERROR_SUCCESS != clipboard->context->ClientFormatDataResponse(clipboard->context, &response))
	{
		// CAUTION: if failed to send, server will wait a long time, default 30 seconds.
	}

	if (buff)
	{
		free(buff);
	}
	return rc;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_format_data_response(CliprdrClientContext *context,
									   const CLIPRDR_FORMAT_DATA_RESPONSE *formatDataResponse)
{
	UINT rc = ERROR_INTERNAL_ERROR;
	BYTE *data;
	HANDLE hMem;
	wfClipboard *clipboard;

	do
	{
		if (!context || !formatDataResponse)
		{
			rc = ERROR_INTERNAL_ERROR;
			break;
		}

		clipboard = (wfClipboard *)context->Custom;
		if (!clipboard)
		{
			rc = ERROR_INTERNAL_ERROR;
			break;
		}
		clipboard->hmem = NULL;

		if (formatDataResponse->msgFlags != CB_RESPONSE_OK)
		{
			// BOOL emptyRes = wf_do_empty_cliprdr((wfClipboard *)context->custom);
			// (void)emptyRes;
			rc = E_FAIL;
			break;
		}

		hMem = GlobalAlloc(GMEM_MOVEABLE, formatDataResponse->dataLen);
		if (!hMem)
		{
			rc = ERROR_INTERNAL_ERROR;
			break;
		}

		data = (BYTE *)GlobalLock(hMem);
		if (!data)
		{
			GlobalFree(hMem);
			rc = ERROR_INTERNAL_ERROR;
			break;
		}

		CopyMemory(data, formatDataResponse->requestedFormatData, formatDataResponse->dataLen);

		if (!GlobalUnlock(hMem) && GetLastError())
		{
			GlobalFree(hMem);
			rc = ERROR_INTERNAL_ERROR;
			break;
		}

		clipboard->hmem = hMem;
		rc = CHANNEL_RC_OK;
	} while (0);

	if (!SetEvent(clipboard->formatDataRespEvent))
	{
		// If failed to set event, set flag to indicate the event is received.
		DEBUG_CLIPRDR("wf_cliprdr_server_format_data_response(), SetEvent failed with 0x%x", GetLastError());
		clipboard->formatDataRespReceived = TRUE;
		rc = ERROR_INTERNAL_ERROR;
	}
	return rc;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_file_contents_request(CliprdrClientContext *context,
										const CLIPRDR_FILE_CONTENTS_REQUEST *fileContentsRequest)
{
	DWORD uSize = 0;
	BYTE *pData = NULL;
	HRESULT hRet = S_OK;
	FORMATETC vFormatEtc;
	LPDATAOBJECT pDataObj = NULL;
	STGMEDIUM vStgMedium;
	BOOL bIsStreamFile = TRUE;
	static LPSTREAM pStreamStc = NULL;
	static UINT32 uStreamIdStc = 0;
	wfClipboard *clipboard;
	UINT rc = ERROR_INTERNAL_ERROR;
	UINT sRc;
	UINT32 cbRequested;

	if (!context || !fileContentsRequest)
	{
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	clipboard = (wfClipboard *)context->Custom;

	if (!clipboard)
	{
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	// If the clipboard is set by the instance, or the file descriptor is from remote,
	// we should not process the request.
	// Because this may be the following cases:
	// 1. `A` -> `B`, `C`
	// 2. Copy in `A`
	// 3. Copy in `B`
	// 4. Paste in `C`
	// In this case, `C` should not get the file content from `A`. The clipboard is set by `B`.
	//
	// Or
	// 1. `B` -> `A` -> `C`
	// 2. Copy in `A`
	// 2. Copy in `B`
	// 3. Paste in `C`
	// In this case, `C` should not get the file content from `A`. The clipboard is set by `B`.
	//
	// We can simply notify `C` to clear the clipboard when `A` received copy message from `B`,
	// if connections are in the same process.
	// But if connections are in different processes, it is not easy to notify the other process.
	// So we just ignore the request from `C` in this case.
	if (is_set_by_instance(clipboard) || is_file_descriptor_from_remote()) {
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	cbRequested = fileContentsRequest->cbRequested;
	if (fileContentsRequest->dwFlags == FILECONTENTS_SIZE)
		cbRequested = sizeof(UINT64);

	pData = (BYTE *)calloc(1, cbRequested);

	if (!pData)
	{
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	hRet = OleGetClipboard(&pDataObj);

	if (FAILED(hRet))
	{
		printf("filecontents: get ole clipboard failed.\n");
		rc = ERROR_INTERNAL_ERROR;
		goto exit;
	}

	ZeroMemory(&vFormatEtc, sizeof(FORMATETC));
	ZeroMemory(&vStgMedium, sizeof(STGMEDIUM));
	vFormatEtc.cfFormat = RegisterClipboardFormat(CFSTR_FILECONTENTS);
	vFormatEtc.tymed = TYMED_ISTREAM;
	vFormatEtc.dwAspect = 1;
	vFormatEtc.lindex = fileContentsRequest->listIndex;
	vFormatEtc.ptd = NULL;

	if ((uStreamIdStc != fileContentsRequest->streamId) || !pStreamStc)
	{
		LPENUMFORMATETC pEnumFormatEtc;
		ULONG CeltFetched;
		FORMATETC vFormatEtc2;

		if (pStreamStc)
		{
			IStream_Release(pStreamStc);
			pStreamStc = NULL;
		}

		bIsStreamFile = FALSE;
		hRet = IDataObject_EnumFormatEtc(pDataObj, DATADIR_GET, &pEnumFormatEtc);

		if (hRet == S_OK)
		{
			do
			{
				hRet = IEnumFORMATETC_Next(pEnumFormatEtc, 1, &vFormatEtc2, &CeltFetched);

				if (hRet == S_OK)
				{
					if (vFormatEtc2.cfFormat == RegisterClipboardFormat(CFSTR_FILECONTENTS))
					{
						hRet = IDataObject_GetData(pDataObj, &vFormatEtc, &vStgMedium);

						if (hRet == S_OK)
						{
							pStreamStc = vStgMedium.pstm;
							uStreamIdStc = fileContentsRequest->streamId;
							bIsStreamFile = TRUE;
						}

						break;
					}
				}
			} while (hRet == S_OK);
		}
	}

	if (bIsStreamFile == TRUE)
	{
		if (fileContentsRequest->dwFlags == FILECONTENTS_SIZE)
		{
			STATSTG vStatStg;
			ZeroMemory(&vStatStg, sizeof(STATSTG));
			hRet = IStream_Stat(pStreamStc, &vStatStg, STATFLAG_NONAME);

			if (hRet == S_OK)
			{
				*((UINT32 *)&pData[0]) = vStatStg.cbSize.LowPart;
				*((UINT32 *)&pData[4]) = vStatStg.cbSize.HighPart;
				uSize = cbRequested;
			}
		}
		else if (fileContentsRequest->dwFlags == FILECONTENTS_RANGE)
		{
			LARGE_INTEGER dlibMove;
			ULARGE_INTEGER dlibNewPosition;

			if (clipboard->nFiles > 0 &&
				fileContentsRequest->listIndex == (UINT32)clipboard->first_file_index &&
				fileContentsRequest->nPositionLow == 0 &&
				fileContentsRequest->nPositionHigh == 0) {
				clipboard->context->HandleClipboardFiles(fileContentsRequest->connID, clipboard->nFiles, clipboard->file_names);
			}

			dlibMove.HighPart = fileContentsRequest->nPositionHigh;
			dlibMove.LowPart = fileContentsRequest->nPositionLow;
			hRet = IStream_Seek(pStreamStc, dlibMove, STREAM_SEEK_SET, &dlibNewPosition);

			if (SUCCEEDED(hRet))
				hRet = IStream_Read(pStreamStc, pData, cbRequested, (PULONG)&uSize);
		}
	}
	else
	{
		if (fileContentsRequest->dwFlags == FILECONTENTS_SIZE)
		{
			if (clipboard->nFiles <= fileContentsRequest->listIndex)
			{
				rc = ERROR_INTERNAL_ERROR;
				goto exit;
			}
			*((UINT32 *)&pData[0]) =
				clipboard->fileDescriptor[fileContentsRequest->listIndex]->nFileSizeLow;
			*((UINT32 *)&pData[4]) =
				clipboard->fileDescriptor[fileContentsRequest->listIndex]->nFileSizeHigh;
			uSize = cbRequested;
		}
		else if (fileContentsRequest->dwFlags == FILECONTENTS_RANGE)
		{
			BOOL bRet;
			if (clipboard->nFiles <= fileContentsRequest->listIndex)
			{
				rc = ERROR_INTERNAL_ERROR;
				goto exit;
			}

			if (clipboard->nFiles > 0 &&
				fileContentsRequest->listIndex == (UINT32)clipboard->first_file_index &&
				fileContentsRequest->nPositionLow == 0 &&
				fileContentsRequest->nPositionHigh == 0) {
				clipboard->context->HandleClipboardFiles(fileContentsRequest->connID, clipboard->nFiles, clipboard->file_names);
			}
			bRet = wf_cliprdr_get_file_contents(
				clipboard->file_names[fileContentsRequest->listIndex], pData,
				fileContentsRequest->nPositionLow, fileContentsRequest->nPositionHigh, cbRequested,
				&uSize);

			if (bRet == FALSE)
			{
				printf("get file contents failed.\n");
				uSize = 0;
				rc = ERROR_INTERNAL_ERROR;
				goto exit;
			}
		}
	}

	rc = CHANNEL_RC_OK;
exit:

	if (pDataObj)
		IDataObject_Release(pDataObj);

	// https://learn.microsoft.com/en-us/windows/win32/api/objidl/nf-objidl-idataobject-getdata#:~:text=value%20of%20its-,pUnkForRelease,-member.%20If%20pUnkForRelease
	if (pStreamStc && vStgMedium.pUnkForRelease == NULL)
	{
		IStream_Release(pStreamStc);
		pStreamStc = NULL;
	}

	if (rc != CHANNEL_RC_OK)
	{
		uSize = 0;
	}

	if (uSize == 0)
	{
		if (pData)
		{
			free(pData);
			pData = NULL;
		}
	}

	sRc =
		cliprdr_send_response_filecontents(
			clipboard,
			fileContentsRequest->connID,
			rc == CHANNEL_RC_OK ? CB_RESPONSE_OK : CB_RESPONSE_FAIL,
			fileContentsRequest->streamId,
			uSize,
			pData);

	if (pData)
	{
		free(pData);
	}

	// if (sRc != CHANNEL_RC_OK)
	//     return sRc;

	return rc;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT
wf_cliprdr_server_file_contents_response(CliprdrClientContext *context,
										 const CLIPRDR_FILE_CONTENTS_RESPONSE *fileContentsResponse)
{
	wfClipboard *clipboard;
	UINT rc = ERROR_INTERNAL_ERROR;

	do
	{
		if (!context || !fileContentsResponse)
		{
			rc = ERROR_INTERNAL_ERROR;
			break;
		}

		clipboard = (wfClipboard *)context->Custom;
		if (!clipboard)
		{
			rc = ERROR_INTERNAL_ERROR;
			break;
		}
		clipboard->req_fsize = 0;
		clipboard->req_fdata = NULL;

		if (fileContentsResponse->msgFlags != CB_RESPONSE_OK)
		{
			rc = E_FAIL;
			break;
		}

		clipboard->req_fsize = fileContentsResponse->cbRequested;
		clipboard->req_fdata = (char *)malloc(fileContentsResponse->cbRequested);
		if (!clipboard->req_fdata)
		{
			rc = ERROR_INTERNAL_ERROR;
			break;
		}

		CopyMemory(clipboard->req_fdata, fileContentsResponse->requestedData,
				   fileContentsResponse->cbRequested);

		rc = CHANNEL_RC_OK;
	} while (0);

	if (!SetEvent(clipboard->req_fevent))
	{
		// If failed to set event, set flag to indicate the event is received.
		DEBUG_CLIPRDR("wf_cliprdr_server_file_contents_response(), SetEvent failed with 0x%x", GetLastError());
		clipboard->req_f_received = TRUE;
	}
	return rc;
}

BOOL is_set_by_instance(wfClipboard *clipboard)
{
	if (GetClipboardOwner() == clipboard->hwnd || S_OK == OleIsCurrentClipboard(clipboard->data_obj)) {
		return TRUE;
	}
	return FALSE;
}

BOOL is_file_descriptor_from_remote()
{
	UINT fsid = 0;
	if (IsClipboardFormatAvailable(CF_HDROP)) {
		return FALSE;
	}
	fsid = RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
	if (IsClipboardFormatAvailable(fsid)) {
		return TRUE;
	}
	return FALSE;
}

BOOL wf_cliprdr_init(wfClipboard *clipboard, CliprdrClientContext *cliprdr)
{
	if (!clipboard || !cliprdr)
		return FALSE;

	clipboard->context = cliprdr;
	clipboard->sync = FALSE;
	clipboard->map_capacity = 32;
	clipboard->map_size = 0;
	clipboard->hUser32 = LoadLibraryA("user32.dll");
	clipboard->data_obj = NULL;
	clipboard->copied = FALSE;

	if (clipboard->hUser32)
	{
		clipboard->AddClipboardFormatListener = (fnAddClipboardFormatListener)GetProcAddress(
			clipboard->hUser32, "AddClipboardFormatListener");
		clipboard->RemoveClipboardFormatListener = (fnRemoveClipboardFormatListener)GetProcAddress(
			clipboard->hUser32, "RemoveClipboardFormatListener");
		clipboard->GetUpdatedClipboardFormats = (fnGetUpdatedClipboardFormats)GetProcAddress(
			clipboard->hUser32, "GetUpdatedClipboardFormats");
	}

	if (!(clipboard->hUser32 && clipboard->AddClipboardFormatListener &&
		  clipboard->RemoveClipboardFormatListener && clipboard->GetUpdatedClipboardFormats))
		clipboard->legacyApi = TRUE;

	if (!(clipboard->format_mappings =
			  (formatMapping *)calloc(clipboard->map_capacity, sizeof(formatMapping))))
		goto error;

	if (!(clipboard->formatDataRespEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
		goto error;
	clipboard->formatDataRespReceived = FALSE;

	if (!(clipboard->data_obj_mutex = CreateMutex(NULL, FALSE, "data_obj_mutex")))
		goto error;

	if (!(clipboard->req_fevent = CreateEvent(NULL, TRUE, FALSE, NULL)))
		goto error;
	clipboard->req_f_received = FALSE;

	if (!(clipboard->thread = CreateThread(NULL, 0, cliprdr_thread_func, clipboard, 0, NULL)))
		goto error;

	cliprdr->MonitorReady = wf_cliprdr_monitor_ready;
	cliprdr->ServerCapabilities = wf_cliprdr_server_capabilities;
	cliprdr->ServerFormatList = wf_cliprdr_server_format_list;
	cliprdr->ServerFormatListResponse = wf_cliprdr_server_format_list_response;
	cliprdr->ServerLockClipboardData = wf_cliprdr_server_lock_clipboard_data;
	cliprdr->ServerUnlockClipboardData = wf_cliprdr_server_unlock_clipboard_data;
	cliprdr->ServerFormatDataRequest = wf_cliprdr_server_format_data_request;
	cliprdr->ServerFormatDataResponse = wf_cliprdr_server_format_data_response;
	cliprdr->ServerFileContentsRequest = wf_cliprdr_server_file_contents_request;
	cliprdr->ServerFileContentsResponse = wf_cliprdr_server_file_contents_response;
	cliprdr->Custom = (void *)clipboard;
	return TRUE;
error:
	wf_cliprdr_uninit(clipboard, cliprdr);
	return FALSE;
}

BOOL wf_cliprdr_uninit(wfClipboard *clipboard, CliprdrClientContext *cliprdr)
{
	if (!clipboard || !cliprdr)
		return FALSE;

	clipboard->copied = FALSE;
	cliprdr->Custom = NULL;

	/* discard all contexts in clipboard */
	if (try_open_clipboard(clipboard->hwnd))
	{
		if (is_set_by_instance(clipboard) || is_file_descriptor_from_remote())
		{
			if (!EmptyClipboard())
			{
				DEBUG_CLIPRDR("EmptyClipboard failed with 0x%x", GetLastError());
			}
		}
		if (!CloseClipboard())
		{
			// critical error!!!
		}
	}
	else
	{
		DEBUG_CLIPRDR("OpenClipboard failed with 0x%x", GetLastError());
	}

	if (clipboard->hwnd)
		PostMessage(clipboard->hwnd, WM_QUIT, 0, 0);

	if (clipboard->thread)
	{
		WaitForSingleObject(clipboard->thread, INFINITE);
		CloseHandle(clipboard->thread);
	}

	if (clipboard->data_obj)
	{
		wf_destroy_file_obj(clipboard->data_obj);
		clipboard->data_obj = NULL;
	}

	if (clipboard->formatDataRespEvent)
		CloseHandle(clipboard->formatDataRespEvent);

	if (clipboard->data_obj_mutex)
		CloseHandle(clipboard->data_obj_mutex);

	if (clipboard->req_fevent)
		CloseHandle(clipboard->req_fevent);

	clear_file_array(clipboard);
	clear_format_map(clipboard);
	free(clipboard->format_mappings);
	return TRUE;
}

wfClipboard clipboard;

BOOL init_cliprdr(CliprdrClientContext *context)
{
	return wf_cliprdr_init(&clipboard, context);
}

BOOL uninit_cliprdr(CliprdrClientContext *context)
{
	return wf_cliprdr_uninit(&clipboard, context);
}

BOOL empty_cliprdr(CliprdrClientContext *context, UINT32 connID)
{
	wfClipboard *clipboard = NULL;
	CliprdrDataObject *instance = NULL;
	BOOL rc = FALSE;
	if (!context)
	{
		return FALSE;
	}
	if (connID == 0)
	{
		return TRUE;
	}

	clipboard = (wfClipboard *)context->Custom;
	if (!clipboard)
	{
		return FALSE;
	}

	instance = clipboard->data_obj;
	if (instance)
	{
		if (instance->m_connID != connID)
		{
			return TRUE;
		}
	}

	return wf_do_empty_cliprdr(clipboard);
}

BOOL wf_do_empty_cliprdr(wfClipboard *clipboard)
{
	BOOL rc = FALSE;
	if (!clipboard)
	{
		return FALSE;
	}

	clipboard->copied = FALSE;

	if (WaitForSingleObject(clipboard->data_obj_mutex, INFINITE) != WAIT_OBJECT_0)
	{
		return FALSE;
	}

	do
	{
		if (clipboard->data_obj != NULL)
		{
			wf_destroy_file_obj(clipboard->data_obj);
			clipboard->data_obj = NULL;
		}

		/* discard all contexts in clipboard */
		if (!try_open_clipboard(clipboard->hwnd))
		{
			DEBUG_CLIPRDR("OpenClipboard failed with 0x%x", GetLastError());
			rc = FALSE;
			break;
		}

		if (is_file_descriptor_from_remote())
		{
			if (!EmptyClipboard())
			{
				rc = FALSE;
			}
		}

		if (!CloseClipboard())
		{
			// critical error!!!
		}
		rc = TRUE;
	} while (0);

	if (!ReleaseMutex(clipboard->data_obj_mutex))
	{
		// critical error!!!
	}
	return rc;
}
