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gecko-dev/widget/windows/nsClipboard.cpp
David P ef73dc056f Bug 1921759: Log the process that holds the clipboard mutex on Windows r=win-reviewers,rkraesig 
When Windows keeps us from getting access to the clipboard because another
application is using it, this will report the exe that currently holds the
mutex.

Differential Revision: https://phabricator.services.mozilla.com/D227742
2024-11-07 00:22:46 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsClipboard.h"
#include <shlobj.h>
#include <intshcut.h>
// shellapi.h is needed to build with WIN32_LEAN_AND_MEAN
#include <shellapi.h>
#include <functional>
#include <thread>
#include <chrono>
#ifdef ACCESSIBILITY
# include "mozilla/a11y/Compatibility.h"
#endif
#include "mozilla/Logging.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_clipboard.h"
#include "mozilla/StaticPrefs_widget.h"
#include "mozilla/WindowsVersion.h"
#include "SpecialSystemDirectory.h"
#include "nsArrayUtils.h"
#include "nsCOMPtr.h"
#include "nsComponentManagerUtils.h"
#include "nsDataObj.h"
#include "nsString.h"
#include "nsNativeCharsetUtils.h"
#include "nsIInputStream.h"
#include "nsITransferable.h"
#include "nsXPCOM.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsPrimitiveHelpers.h"
#include "nsIWidget.h"
#include "nsWidgetsCID.h"
#include "nsCRT.h"
#include "nsNetUtil.h"
#include "nsIFileProtocolHandler.h"
#include "nsEscape.h"
#include "nsIObserverService.h"
#include "nsMimeTypes.h"
#include "imgITools.h"
#include "imgIContainer.h"
#include "WinUtils.h"
/* static */
UINT nsClipboard::GetClipboardFileDescriptorFormatA() {
static UINT format = ::RegisterClipboardFormatW(CFSTR_FILEDESCRIPTORA);
MOZ_ASSERT(format);
return format;
}
/* static */
UINT nsClipboard::GetClipboardFileDescriptorFormatW() {
static UINT format = ::RegisterClipboardFormatW(CFSTR_FILEDESCRIPTORW);
MOZ_ASSERT(format);
return format;
}
/* static */
UINT nsClipboard::GetHtmlClipboardFormat() {
static UINT format = ::RegisterClipboardFormatW(L"HTML Format");
return format;
}
/* static */
UINT nsClipboard::GetCustomClipboardFormat() {
static UINT format =
::RegisterClipboardFormatW(L"application/x-moz-custom-clipdata");
return format;
}
//-------------------------------------------------------------------------
//
// nsClipboard constructor
//
//-------------------------------------------------------------------------
nsClipboard::nsClipboard()
: nsBaseClipboard(mozilla::dom::ClipboardCapabilities(
false /* supportsSelectionClipboard */,
false /* supportsFindClipboard */,
false /* supportsSelectionCache */)) {
mWindow = nullptr;
// Register for a shutdown notification so that we can flush data
// to the OS clipboard.
nsCOMPtr<nsIObserverService> observerService =
do_GetService("@mozilla.org/observer-service;1");
if (observerService) {
observerService->AddObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID,
false);
}
}
//-------------------------------------------------------------------------
// nsClipboard destructor
//-------------------------------------------------------------------------
nsClipboard::~nsClipboard() {}
NS_IMPL_ISUPPORTS_INHERITED(nsClipboard, nsBaseClipboard, nsIObserver)
NS_IMETHODIMP
nsClipboard::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
// This will be called on shutdown.
::OleFlushClipboard();
::CloseClipboard();
return NS_OK;
}
//-------------------------------------------------------------------------
UINT nsClipboard::GetFormat(const char* aMimeStr, bool aMapHTMLMime) {
UINT format;
if (strcmp(aMimeStr, kTextMime) == 0) {
format = CF_UNICODETEXT;
} else if (strcmp(aMimeStr, kRTFMime) == 0) {
format = ::RegisterClipboardFormat(L"Rich Text Format");
} else if (strcmp(aMimeStr, kJPEGImageMime) == 0 ||
strcmp(aMimeStr, kJPGImageMime) == 0 ||
strcmp(aMimeStr, kPNGImageMime) == 0) {
format = CF_DIBV5;
} else if (strcmp(aMimeStr, kFileMime) == 0 ||
strcmp(aMimeStr, kFilePromiseMime) == 0) {
format = CF_HDROP;
} else if ((strcmp(aMimeStr, kNativeHTMLMime) == 0) ||
(aMapHTMLMime && strcmp(aMimeStr, kHTMLMime) == 0)) {
format = GetHtmlClipboardFormat();
} else if (strcmp(aMimeStr, kCustomTypesMime) == 0) {
format = GetCustomClipboardFormat();
} else {
format = ::RegisterClipboardFormatW(NS_ConvertASCIItoUTF16(aMimeStr).get());
}
return format;
}
//-------------------------------------------------------------------------
// static
nsresult nsClipboard::CreateNativeDataObject(
nsITransferable* aTransferable, IDataObject** aDataObj, nsIURI* aUri,
MightNeedToFlush* aMightNeedToFlush) {
MOZ_ASSERT(aTransferable);
if (!aTransferable) {
return NS_ERROR_FAILURE;
}
// Create our native DataObject that implements the OLE IDataObject interface
RefPtr<nsDataObj> dataObj = new nsDataObj(aUri);
// Now set it up with all the right data flavors & enums
nsresult res =
SetupNativeDataObject(aTransferable, dataObj, aMightNeedToFlush);
if (NS_SUCCEEDED(res)) {
dataObj.forget(aDataObj);
}
return res;
}
static nsresult StoreValueInDataObject(nsDataObj* aObj,
LPCWSTR aClipboardFormat, DWORD value) {
HGLOBAL hGlobalMemory = ::GlobalAlloc(GMEM_MOVEABLE, sizeof(DWORD));
if (!hGlobalMemory) {
return NS_ERROR_OUT_OF_MEMORY;
}
DWORD* pdw = (DWORD*)::GlobalLock(hGlobalMemory);
*pdw = value;
::GlobalUnlock(hGlobalMemory);
STGMEDIUM stg;
stg.tymed = TYMED_HGLOBAL;
stg.pUnkForRelease = nullptr;
stg.hGlobal = hGlobalMemory;
FORMATETC fe;
SET_FORMATETC(fe, ::RegisterClipboardFormat(aClipboardFormat), 0,
DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
aObj->SetData(&fe, &stg, TRUE);
return NS_OK;
}
//-------------------------------------------------------------------------
nsresult nsClipboard::SetupNativeDataObject(
nsITransferable* aTransferable, IDataObject* aDataObj,
MightNeedToFlush* aMightNeedToFlush) {
MOZ_ASSERT(aTransferable);
MOZ_ASSERT(aDataObj);
if (!aTransferable || !aDataObj) {
return NS_ERROR_FAILURE;
}
auto* dObj = static_cast<nsDataObj*>(aDataObj);
if (aMightNeedToFlush) {
*aMightNeedToFlush = MightNeedToFlush::No;
}
// Now give the Transferable to the DataObject
// for getting the data out of it
dObj->SetTransferable(aTransferable);
// Get the transferable list of data flavors
nsTArray<nsCString> flavors;
aTransferable->FlavorsTransferableCanExport(flavors);
// Walk through flavors that contain data and register them
// into the DataObj as supported flavors
for (uint32_t i = 0; i < flavors.Length(); i++) {
nsCString& flavorStr = flavors[i];
// When putting data onto the clipboard, we want to maintain kHTMLMime
// ("text/html") and not map it to CF_HTML here since this will be done
// below.
UINT format = GetFormat(flavorStr.get(), false);
// Now tell the native IDataObject about both our mime type and
// the native data format
FORMATETC fe;
SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
dObj->AddDataFlavor(flavorStr.get(), &fe);
// Do various things internal to the implementation, like map one
// flavor to another or add additional flavors based on what's required
// for the win32 impl.
if (flavorStr.EqualsLiteral(kTextMime)) {
// if we find text/plain, also add CF_TEXT, but we can add it for
// text/plain as well.
FORMATETC textFE;
SET_FORMATETC(textFE, CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
dObj->AddDataFlavor(kTextMime, &textFE);
if (aMightNeedToFlush) {
*aMightNeedToFlush = MightNeedToFlush::Yes;
}
} else if (flavorStr.EqualsLiteral(kHTMLMime)) {
// if we find text/html, also advertise win32's html flavor (which we will
// convert on our own in nsDataObj::GetText().
FORMATETC htmlFE;
SET_FORMATETC(htmlFE, GetHtmlClipboardFormat(), 0, DVASPECT_CONTENT, -1,
TYMED_HGLOBAL);
dObj->AddDataFlavor(kHTMLMime, &htmlFE);
} else if (flavorStr.EqualsLiteral(kURLMime)) {
// if we're a url, in addition to also being text, we need to register
// the "file" flavors so that the win32 shell knows to create an internet
// shortcut when it sees one of these beasts.
FORMATETC shortcutFE;
SET_FORMATETC(shortcutFE,
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA), 0,
DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(kURLMime, &shortcutFE);
SET_FORMATETC(shortcutFE,
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW), 0,
DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(kURLMime, &shortcutFE);
SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_FILECONTENTS),
0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(kURLMime, &shortcutFE);
SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_INETURLA), 0,
DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(kURLMime, &shortcutFE);
SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_INETURLW), 0,
DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(kURLMime, &shortcutFE);
} else if (flavorStr.EqualsLiteral(kPNGImageMime) ||
flavorStr.EqualsLiteral(kJPEGImageMime) ||
flavorStr.EqualsLiteral(kJPGImageMime) ||
flavorStr.EqualsLiteral(kGIFImageMime) ||
flavorStr.EqualsLiteral(kNativeImageMime)) {
// if we're an image, register the native bitmap flavor
FORMATETC imageFE;
// Add DIBv5
SET_FORMATETC(imageFE, CF_DIBV5, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(flavorStr.get(), &imageFE);
// Add DIBv3
SET_FORMATETC(imageFE, CF_DIB, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(flavorStr.get(), &imageFE);
} else if (flavorStr.EqualsLiteral(kFilePromiseMime)) {
// if we're a file promise flavor, also register the
// CFSTR_PREFERREDDROPEFFECT format. The data object
// returns a value of DROPEFFECTS_MOVE to the drop target
// when it asks for the value of this format. This causes
// the file to be moved from the temporary location instead
// of being copied. The right thing to do here is to call
// SetData() on the data object and set the value of this format
// to DROPEFFECTS_MOVE on this particular data object. But,
// since all the other clipboard formats follow the model of setting
// data on the data object only when the drop object calls GetData(),
// I am leaving this format's value hard coded in the data object.
// We can change this if other consumers of this format get added to this
// codebase and they need different values.
FORMATETC shortcutFE;
SET_FORMATETC(shortcutFE,
::RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT), 0,
DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
dObj->AddDataFlavor(kFilePromiseMime, &shortcutFE);
}
}
if (!mozilla::StaticPrefs::
clipboard_copyPrivateDataToClipboardCloudOrHistory()) {
// Let Clipboard know that data is sensitive and must not be copied to
// the Cloud Clipboard, Clipboard History and similar.
// https://docs.microsoft.com/en-us/windows/win32/dataxchg/clipboard-formats#cloud-clipboard-and-clipboard-history-formats
if (aTransferable->GetIsPrivateData()) {
nsresult rv =
StoreValueInDataObject(dObj, TEXT("CanUploadToCloudClipboard"), 0);
NS_ENSURE_SUCCESS(rv, rv);
rv =
StoreValueInDataObject(dObj, TEXT("CanIncludeInClipboardHistory"), 0);
NS_ENSURE_SUCCESS(rv, rv);
rv = StoreValueInDataObject(
dObj, TEXT("ExcludeClipboardContentFromMonitorProcessing"), 0);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
// See methods listed at
// <https://docs.microsoft.com/en-us/windows/win32/api/objidl/nn-objidl-idataobject#methods>.
static void IDataObjectMethodResultToString(const HRESULT aHres,
nsACString& aResult) {
switch (aHres) {
case E_INVALIDARG:
aResult = "E_INVALIDARG";
break;
case E_UNEXPECTED:
aResult = "E_UNEXPECTED";
break;
case E_OUTOFMEMORY:
aResult = "E_OUTOFMEMORY";
break;
case DV_E_LINDEX:
aResult = "DV_E_LINDEX";
break;
case DV_E_FORMATETC:
aResult = "DV_E_FORMATETC";
break;
case DV_E_TYMED:
aResult = "DV_E_TYMED";
break;
case DV_E_DVASPECT:
aResult = "DV_E_DVASPECT";
break;
case OLE_E_NOTRUNNING:
aResult = "OLE_E_NOTRUNNING";
break;
case STG_E_MEDIUMFULL:
aResult = "STG_E_MEDIUMFULL";
break;
case DV_E_CLIPFORMAT:
aResult = "DV_E_CLIPFORMAT";
break;
case S_OK:
aResult = "S_OK";
break;
default:
// Explicit template instantiaton, because otherwise the call is
// ambiguous.
constexpr int kRadix = 16;
aResult = IntToCString<int32_t>(aHres, kRadix);
break;
}
}
// See
// <https://docs.microsoft.com/en-us/windows/win32/api/ole2/nf-ole2-olegetclipboard>.
static void OleGetClipboardResultToString(const HRESULT aHres,
nsACString& aResult) {
switch (aHres) {
case S_OK:
aResult = "S_OK";
break;
case CLIPBRD_E_CANT_OPEN:
aResult = "CLIPBRD_E_CANT_OPEN";
break;
case CLIPBRD_E_CANT_CLOSE:
aResult = "CLIPBRD_E_CANT_CLOSE";
break;
default:
// Explicit template instantiaton, because otherwise the call is
// ambiguous.
constexpr int kRadix = 16;
aResult = IntToCString<int32_t>(aHres, kRadix);
break;
}
}
static void MaybeLogClipboardCurrentOwner(
const HRESULT aHres, const mozilla::StaticString& aMethodName) {
if (!MOZ_CLIPBOARD_LOG_ENABLED()) {
return;
}
if (aHres != CLIPBRD_E_CANT_OPEN) {
return;
}
auto hwnd = ::GetOpenClipboardWindow();
if (!hwnd) {
MOZ_CLIPBOARD_LOG(
"IDataObject::%s | Clipboard already opened by unknown process",
aMethodName.get());
return;
}
DWORD procId;
DWORD threadId = ::GetWindowThreadProcessId(hwnd, &procId);
NS_ENSURE_TRUE_VOID(threadId);
nsAutoString procName;
NS_ENSURE_SUCCESS_VOID(
mozilla::widget::WinUtils::GetProcessImageName(procId, procName));
MOZ_CLIPBOARD_LOG(
"IDataObject::%s | Clipboard already opened by HWND: %p | "
"Process ID: %lu | Thread ID: %lu | App name: %s",
aMethodName.get(), hwnd, procId, threadId,
NS_ConvertUTF16toUTF8(procName).get());
}
// See
// <https://docs.microsoft.com/en-us/windows/win32/api/ole2/nf-ole2-olegetclipboard>.
static void LogOleGetClipboardResult(const HRESULT aHres) {
if (MOZ_CLIPBOARD_LOG_ENABLED()) {
nsAutoCString hresString;
OleGetClipboardResultToString(aHres, hresString);
MOZ_CLIPBOARD_LOG("OleGetClipboard result: %s", hresString.get());
MaybeLogClipboardCurrentOwner(aHres, "OleGetClipboard");
}
}
// See
// <https://docs.microsoft.com/en-us/windows/win32/api/ole2/nf-ole2-olesetclipboard>.
static void OleSetClipboardResultToString(HRESULT aHres, nsACString& aResult) {
switch (aHres) {
case S_OK:
aResult = "S_OK";
break;
case CLIPBRD_E_CANT_OPEN:
aResult = "CLIPBRD_E_CANT_OPEN";
break;
case CLIPBRD_E_CANT_EMPTY:
aResult = "CLIPBRD_E_CANT_EMPTY";
break;
case CLIPBRD_E_CANT_CLOSE:
aResult = "CLIPBRD_E_CANT_CLOSE";
break;
case CLIPBRD_E_CANT_SET:
aResult = "CLIPBRD_E_CANT_SET";
break;
default:
// Explicit template instantiaton, because otherwise the call is
// ambiguous.
constexpr int kRadix = 16;
aResult = IntToCString<int32_t>(aHres, kRadix);
break;
}
}
// See
// <https://docs.microsoft.com/en-us/windows/win32/api/ole2/nf-ole2-olesetclipboard>.
static void LogOleSetClipboardResult(const HRESULT aHres) {
if (MOZ_CLIPBOARD_LOG_ENABLED()) {
nsAutoCString hresString;
OleSetClipboardResultToString(aHres, hresString);
MOZ_CLIPBOARD_LOG("OleSetClipboard result: %s", hresString.get());
MaybeLogClipboardCurrentOwner(aHres, "OleSetClipboard");
}
}
template <typename Function, typename LogFunction, typename... Args>
static HRESULT RepeatedlyTry(Function aFunction, LogFunction aLogFunction,
Args... aArgs) {
// These are magic values based on local testing. They are chosen not higher
// to avoid jank (<https://developer.mozilla.org/en-US/docs/Glossary/Jank>).
// When changing them, be careful.
static constexpr int kNumberOfTries = 3;
static constexpr int kDelayInMs = 3;
HRESULT hres;
for (int i = 0; i < kNumberOfTries; ++i) {
hres = aFunction(aArgs...);
aLogFunction(hres);
if (hres == S_OK) {
break;
}
// TODO: This was formerly std::sleep_for, which wasn't actually sleeping
// in tests (bug 1927664).
::SleepEx(kDelayInMs, TRUE);
}
return hres;
}
// Other apps can block access to the clipboard. This repeatedly
// calls `::OleSetClipboard` for a fixed number of times and should be called
// instead of `::OleSetClipboard`.
static void RepeatedlyTryOleSetClipboard(IDataObject* aDataObj) {
RepeatedlyTry(::OleSetClipboard, LogOleSetClipboardResult, aDataObj);
}
//-------------------------------------------------------------------------
NS_IMETHODIMP nsClipboard::SetNativeClipboardData(
nsITransferable* aTransferable, ClipboardType aWhichClipboard) {
MOZ_CLIPBOARD_LOG("%s", __FUNCTION__);
if (aWhichClipboard != kGlobalClipboard) {
return NS_ERROR_FAILURE;
}
// make sure we have a good transferable
if (!aTransferable) {
return NS_ERROR_FAILURE;
}
#ifdef ACCESSIBILITY
mozilla::a11y::Compatibility::SuppressA11yForClipboardCopy();
#endif
RefPtr<IDataObject> dataObj;
auto mightNeedToFlush = MightNeedToFlush::No;
if (NS_SUCCEEDED(CreateNativeDataObject(aTransferable,
getter_AddRefs(dataObj), nullptr,
&mightNeedToFlush))) {
RepeatedlyTryOleSetClipboard(dataObj);
const bool doFlush = [&] {
switch (mozilla::StaticPrefs::widget_windows_sync_clipboard_flush()) {
case 0:
return false;
case 1:
return true;
default:
// Bug 1774285: Windows Suggested Actions (introduced in Windows 11
// 22H2) walks the entire a11y tree using UIA if something is placed
// on the clipboard using delayed rendering. (The OLE clipboard always
// uses delayed rendering.) This a11y tree walk causes an unacceptable
// hang, particularly when the a11y cache is disabled. We choose the
// lesser of the two performance/memory evils here and force immediate
// rendering as part of our workaround.
return mightNeedToFlush == MightNeedToFlush::Yes &&
mozilla::IsWin1122H2OrLater();
}
}();
if (doFlush) {
RepeatedlyTry(::OleFlushClipboard, [](HRESULT) {});
}
} else {
// Clear the native clipboard
RepeatedlyTryOleSetClipboard(nullptr);
}
return NS_OK;
}
//-------------------------------------------------------------------------
nsresult nsClipboard::GetGlobalData(HGLOBAL aHGBL, void** aData,
uint32_t* aLen) {
MOZ_CLIPBOARD_LOG("%s", __FUNCTION__);
// Allocate a new memory buffer and copy the data from global memory.
// Recall that win98 allocates to nearest DWORD boundary. As a safety
// precaution, allocate an extra 3 bytes (but don't report them in |aLen|!)
// and null them out to ensure that all of our NS_strlen calls will succeed.
// NS_strlen operates on char16_t, so we need 3 NUL bytes to ensure it finds
// a full NUL char16_t when |*aLen| is odd.
nsresult result = NS_ERROR_FAILURE;
if (aHGBL != nullptr) {
LPSTR lpStr = (LPSTR)GlobalLock(aHGBL);
mozilla::CheckedInt<uint32_t> allocSize =
mozilla::CheckedInt<uint32_t>(GlobalSize(aHGBL)) + 3;
if (!allocSize.isValid()) {
return NS_ERROR_INVALID_ARG;
}
char* data = static_cast<char*>(malloc(allocSize.value()));
if (data) {
uint32_t size = allocSize.value() - 3;
memcpy(data, lpStr, size);
// null terminate for safety
data[size] = data[size + 1] = data[size + 2] = '\0';
GlobalUnlock(aHGBL);
*aData = data;
*aLen = size;
result = NS_OK;
}
} else {
// We really shouldn't ever get here
// but just in case
*aData = nullptr;
*aLen = 0;
LPVOID lpMsgBuf;
FormatMessageW(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, nullptr,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPWSTR)&lpMsgBuf, 0, nullptr);
// Display the string.
MessageBoxW(nullptr, (LPCWSTR)lpMsgBuf, L"GetLastError",
MB_OK | MB_ICONINFORMATION);
// Free the buffer.
LocalFree(lpMsgBuf);
}
return result;
}
//-------------------------------------------------------------------------
nsresult nsClipboard::GetNativeDataOffClipboard(nsIWidget* aWidget,
UINT /*aIndex*/, UINT aFormat,
void** aData, uint32_t* aLen) {
MOZ_CLIPBOARD_LOG("%s: overload taking nsIWidget*.", __FUNCTION__);
HGLOBAL hglb;
nsresult result = NS_ERROR_FAILURE;
HWND nativeWin = nullptr;
if (::OpenClipboard(nativeWin)) {
hglb = ::GetClipboardData(aFormat);
result = GetGlobalData(hglb, aData, aLen);
::CloseClipboard();
}
return result;
}
// See methods listed at
// <https://docs.microsoft.com/en-us/windows/win32/api/objidl/nn-objidl-idataobject#methods>.
static void LogIDataObjectMethodResult(const HRESULT aHres,
mozilla::StaticString aMethodName) {
if (MOZ_CLIPBOARD_LOG_ENABLED()) {
nsAutoCString hresString;
IDataObjectMethodResultToString(aHres, hresString);
MOZ_CLIPBOARD_LOG("IDataObject::%s result : %s", aMethodName.get(),
hresString.get());
MaybeLogClipboardCurrentOwner(aHres, aMethodName);
}
}
// Other apps can block access to the clipboard. This repeatedly calls
// `GetData` for a fixed number of times and should be called instead of
// `GetData`. See
// <https://docs.microsoft.com/en-us/windows/win32/api/objidl/nf-objidl-idataobject-getdata>.
// While Microsoft's documentation doesn't include `CLIPBRD_E_CANT_OPEN`
// explicitly, it allows it implicitly and in local experiments it was indeed
// returned.
static HRESULT RepeatedlyTryGetData(IDataObject& aDataObject, LPFORMATETC pFE,
LPSTGMEDIUM pSTM) {
return RepeatedlyTry(
[&aDataObject, &pFE, &pSTM]() { return aDataObject.GetData(pFE, pSTM); },
[](HRESULT hres) { LogIDataObjectMethodResult(hres, "GetData"); });
}
//-------------------------------------------------------------------------
// static
HRESULT nsClipboard::FillSTGMedium(IDataObject* aDataObject, UINT aFormat,
LPFORMATETC pFE, LPSTGMEDIUM pSTM,
DWORD aTymed) {
SET_FORMATETC(*pFE, aFormat, 0, DVASPECT_CONTENT, -1, aTymed);
// Starting by querying for the data to see if we can get it as from global
// memory
HRESULT hres = S_FALSE;
hres = aDataObject->QueryGetData(pFE);
LogIDataObjectMethodResult(hres, "QueryGetData");
if (S_OK == hres) {
hres = RepeatedlyTryGetData(*aDataObject, pFE, pSTM);
}
return hres;
}
//-------------------------------------------------------------------------
// If aFormat is CF_DIBV5, aMIMEImageFormat must be a type for which we have
// an image encoder (e.g. image/png).
// For other values of aFormat, it is OK to pass null for aMIMEImageFormat.
nsresult nsClipboard::GetNativeDataOffClipboard(IDataObject* aDataObject,
UINT aIndex, UINT aFormat,
const char* aMIMEImageFormat,
void** aData, uint32_t* aLen) {
MOZ_CLIPBOARD_LOG("%s: overload taking IDataObject*.", __FUNCTION__);
nsresult result = NS_ERROR_FAILURE;
*aData = nullptr;
*aLen = 0;
if (!aDataObject) {
return result;
}
UINT format = aFormat;
HRESULT hres = S_FALSE;
// XXX at the moment we only support global memory transfers
// It is here where we will add support for native images
// and IStream
FORMATETC fe;
STGMEDIUM stm;
hres = FillSTGMedium(aDataObject, format, &fe, &stm, TYMED_HGLOBAL);
// If the format is CF_HDROP and we haven't found any files we can try looking
// for virtual files with FILEDESCRIPTOR.
if (FAILED(hres) && format == CF_HDROP) {
hres = FillSTGMedium(aDataObject,
nsClipboard::GetClipboardFileDescriptorFormatW(), &fe,
&stm, TYMED_HGLOBAL);
if (FAILED(hres)) {
hres = FillSTGMedium(aDataObject,
nsClipboard::GetClipboardFileDescriptorFormatA(),
&fe, &stm, TYMED_HGLOBAL);
}
}
// Currently this is only handling TYMED_HGLOBAL data
// For Text, Dibs, Files, and generic data (like HTML)
if (S_OK == hres) {
static CLIPFORMAT fileDescriptorFlavorA =
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA);
static CLIPFORMAT fileDescriptorFlavorW =
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
static CLIPFORMAT fileFlavor =
::RegisterClipboardFormat(CFSTR_FILECONTENTS);
static CLIPFORMAT preferredDropEffect =
::RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT);
switch (stm.tymed) {
case TYMED_HGLOBAL: {
switch (fe.cfFormat) {
case CF_TEXT: {
// Get the data out of the global data handle. The size we
// return should not include the null because the other
// platforms don't use nulls, so just return the length we get
// back from strlen(), since we know CF_TEXT is null
// terminated. Recall that GetGlobalData() returns the size of
// the allocated buffer, not the size of the data (on 98, these
// are not the same) so we can't use that.
uint32_t allocLen = 0;
if (NS_SUCCEEDED(GetGlobalData(stm.hGlobal, aData, &allocLen))) {
*aLen = strlen(reinterpret_cast<char*>(*aData));
result = NS_OK;
}
} break;
case CF_UNICODETEXT: {
// Get the data out of the global data handle. The size we
// return should not include the null because the other
// platforms don't use nulls, so just return the length we get
// back from strlen(), since we know CF_UNICODETEXT is null
// terminated. Recall that GetGlobalData() returns the size of
// the allocated buffer, not the size of the data (on 98, these
// are not the same) so we can't use that.
uint32_t allocLen = 0;
if (NS_SUCCEEDED(GetGlobalData(stm.hGlobal, aData, &allocLen))) {
*aLen = NS_strlen(reinterpret_cast<char16_t*>(*aData)) * 2;
result = NS_OK;
}
} break;
case CF_DIBV5:
if (aMIMEImageFormat) {
uint32_t allocLen = 0;
const char* clipboardData;
if (NS_SUCCEEDED(GetGlobalData(
stm.hGlobal, (void**)&clipboardData, &allocLen))) {
nsCOMPtr<imgIContainer> container;
nsCOMPtr<imgITools> imgTools =
do_CreateInstance("@mozilla.org/image/tools;1");
result = imgTools->DecodeImageFromBuffer(
clipboardData, allocLen,
nsLiteralCString(IMAGE_BMP_MS_CLIPBOARD),
getter_AddRefs(container));
if (NS_FAILED(result)) {
break;
}
nsAutoCString mimeType;
if (strcmp(aMIMEImageFormat, kJPGImageMime) == 0) {
mimeType.Assign(IMAGE_JPEG);
} else {
mimeType.Assign(aMIMEImageFormat);
}
nsCOMPtr<nsIInputStream> inputStream;
result = imgTools->EncodeImage(container, mimeType, u""_ns,
getter_AddRefs(inputStream));
if (NS_FAILED(result)) {
break;
}
if (!inputStream) {
result = NS_ERROR_FAILURE;
break;
}
*aData = inputStream.forget().take();
*aLen = sizeof(nsIInputStream*);
}
}
break;
case CF_HDROP: {
// in the case of a file drop, multiple files are stashed within a
// single data object. In order to match mozilla's D&D apis, we
// just pull out the file at the requested index, pretending as
// if there really are multiple drag items.
HDROP dropFiles = (HDROP)GlobalLock(stm.hGlobal);
UINT numFiles = ::DragQueryFileW(dropFiles, 0xFFFFFFFF, nullptr, 0);
NS_ASSERTION(numFiles > 0,
"File drop flavor, but no files...hmmmm");
NS_ASSERTION(aIndex < numFiles,
"Asked for a file index out of range of list");
if (numFiles > 0) {
UINT fileNameLen =
::DragQueryFileW(dropFiles, aIndex, nullptr, 0);
wchar_t* buffer = reinterpret_cast<wchar_t*>(
moz_xmalloc((fileNameLen + 1) * sizeof(wchar_t)));
::DragQueryFileW(dropFiles, aIndex, buffer, fileNameLen + 1);
*aData = buffer;
*aLen = fileNameLen * sizeof(char16_t);
result = NS_OK;
}
GlobalUnlock(stm.hGlobal);
} break;
default: {
if (fe.cfFormat == fileDescriptorFlavorA ||
fe.cfFormat == fileDescriptorFlavorW) {
nsAutoString tempPath;
LPFILEGROUPDESCRIPTOR fgdesc =
static_cast<LPFILEGROUPDESCRIPTOR>(GlobalLock(stm.hGlobal));
if (fgdesc) {
result = GetTempFilePath(
nsDependentString((fgdesc->fgd)[aIndex].cFileName),
tempPath);
GlobalUnlock(stm.hGlobal);
}
if (NS_FAILED(result)) {
break;
}
result = SaveStorageOrStream(aDataObject, aIndex, tempPath);
if (NS_FAILED(result)) {
break;
}
wchar_t* buffer = reinterpret_cast<wchar_t*>(
moz_xmalloc((tempPath.Length() + 1) * sizeof(wchar_t)));
wcscpy(buffer, tempPath.get());
*aData = buffer;
*aLen = tempPath.Length() * sizeof(wchar_t);
result = NS_OK;
} else if (fe.cfFormat == fileFlavor) {
NS_WARNING(
"Mozilla doesn't yet understand how to read this type of "
"file flavor");
} else {
// Get the data out of the global data handle. The size we
// return should not include the null because the other
// platforms don't use nulls, so just return the length we get
// back from strlen(), since we know CF_UNICODETEXT is null
// terminated. Recall that GetGlobalData() returns the size of
// the allocated buffer, not the size of the data (on 98, these
// are not the same) so we can't use that.
//
// NOTE: we are assuming that anything that falls into this
// default case is unicode. As we start to get more
// kinds of binary data, this may become an incorrect
// assumption. Stay tuned.
uint32_t allocLen = 0;
if (NS_SUCCEEDED(GetGlobalData(stm.hGlobal, aData, &allocLen))) {
if (fe.cfFormat == GetHtmlClipboardFormat()) {
// CF_HTML is actually UTF8, not unicode, so disregard the
// assumption above. We have to check the header for the
// actual length, and we'll do that in FindPlatformHTML().
// For now, return the allocLen. This case is mostly to
// ensure we don't try to call strlen on the buffer.
*aLen = allocLen;
} else if (fe.cfFormat == GetCustomClipboardFormat()) {
// Binary data
*aLen = allocLen;
} else if (fe.cfFormat == preferredDropEffect) {
// As per the MSDN doc entitled: "Shell Clipboard Formats"
// CFSTR_PREFERREDDROPEFFECT should return a DWORD
// Reference:
// http://msdn.microsoft.com/en-us/library/bb776902(v=vs.85).aspx
NS_ASSERTION(
allocLen == sizeof(DWORD),
"CFSTR_PREFERREDDROPEFFECT should return a DWORD");
*aLen = allocLen;
} else {
*aLen = NS_strlen(reinterpret_cast<char16_t*>(*aData)) *
sizeof(char16_t);
}
result = NS_OK;
}
}
} break;
} // switch
} break;
case TYMED_GDI: {
#ifdef DEBUG
MOZ_CLIPBOARD_LOG("*********************** TYMED_GDI");
#endif
} break;
default:
break;
} // switch
ReleaseStgMedium(&stm);
}
return result;
}
//-------------------------------------------------------------------------
nsresult nsClipboard::GetDataFromDataObject(IDataObject* aDataObject,
UINT anIndex, nsIWidget* aWindow,
nsITransferable* aTransferable) {
MOZ_CLIPBOARD_LOG("%s", __FUNCTION__);
// make sure we have a good transferable
if (!aTransferable) {
return NS_ERROR_INVALID_ARG;
}
nsresult res = NS_ERROR_FAILURE;
// get flavor list that includes all flavors that can be written (including
// ones obtained through conversion)
nsTArray<nsCString> flavors;
res = aTransferable->FlavorsTransferableCanImport(flavors);
if (NS_FAILED(res)) {
return NS_ERROR_FAILURE;
}
// Walk through flavors and see which flavor is on the clipboard them on the
// native clipboard,
for (uint32_t i = 0; i < flavors.Length(); i++) {
nsCString& flavorStr = flavors[i];
UINT format = GetFormat(flavorStr.get());
// Try to get the data using the desired flavor. This might fail, but all is
// not lost.
void* data = nullptr;
uint32_t dataLen = 0;
bool dataFound = false;
if (nullptr != aDataObject) {
if (NS_SUCCEEDED(GetNativeDataOffClipboard(aDataObject, anIndex, format,
flavorStr.get(), &data,
&dataLen))) {
dataFound = true;
}
} else if (nullptr != aWindow) {
if (NS_SUCCEEDED(GetNativeDataOffClipboard(aWindow, anIndex, format,
&data, &dataLen))) {
dataFound = true;
}
}
// This is our second chance to try to find some data, having not found it
// when directly asking for the flavor. Let's try digging around in other
// flavors to help satisfy our craving for data.
if (!dataFound) {
if (flavorStr.EqualsLiteral(kTextMime)) {
dataFound =
FindUnicodeFromPlainText(aDataObject, anIndex, &data, &dataLen);
} else if (flavorStr.EqualsLiteral(kURLMime)) {
// drags from other windows apps expose the native
// CFSTR_INETURL{A,W} flavor
dataFound = FindURLFromNativeURL(aDataObject, anIndex, &data, &dataLen);
if (!dataFound) {
dataFound =
FindURLFromLocalFile(aDataObject, anIndex, &data, &dataLen);
}
}
} // if we try one last ditch effort to find our data
// Hopefully by this point we've found it and can go about our business
if (dataFound) {
nsCOMPtr<nsISupports> genericDataWrapper;
if (flavorStr.EqualsLiteral(kFileMime)) {
// we have a file path in |data|. Create an nsLocalFile object.
nsDependentString filepath(reinterpret_cast<char16_t*>(data));
nsCOMPtr<nsIFile> file;
if (NS_SUCCEEDED(NS_NewLocalFile(filepath, getter_AddRefs(file)))) {
genericDataWrapper = do_QueryInterface(file);
}
free(data);
} else if (flavorStr.EqualsLiteral(kNativeHTMLMime)) {
uint32_t dummy;
// the editor folks want CF_HTML exactly as it's on the clipboard, no
// conversions, no fancy stuff. Pull it off the clipboard, stuff it into
// a wrapper and hand it back to them.
if (FindPlatformHTML(aDataObject, anIndex, &data, &dummy, &dataLen)) {
nsPrimitiveHelpers::CreatePrimitiveForData(
flavorStr, data, dataLen, getter_AddRefs(genericDataWrapper));
} else {
free(data);
continue; // something wrong with this flavor, keep looking for other
// data
}
free(data);
} else if (flavorStr.EqualsLiteral(kHTMLMime)) {
uint32_t startOfData = 0;
// The JS folks want CF_HTML exactly as it is on the clipboard, but
// minus the CF_HTML header index information.
// It also needs to be converted to UTF16 and have linebreaks changed.
if (FindPlatformHTML(aDataObject, anIndex, &data, &startOfData,
&dataLen)) {
dataLen -= startOfData;
nsPrimitiveHelpers::CreatePrimitiveForCFHTML(
static_cast<char*>(data) + startOfData, &dataLen,
getter_AddRefs(genericDataWrapper));
} else {
free(data);
continue; // something wrong with this flavor, keep looking for other
// data
}
free(data);
} else if (flavorStr.EqualsLiteral(kJPEGImageMime) ||
flavorStr.EqualsLiteral(kJPGImageMime) ||
flavorStr.EqualsLiteral(kPNGImageMime)) {
nsIInputStream* imageStream = reinterpret_cast<nsIInputStream*>(data);
genericDataWrapper = do_QueryInterface(imageStream);
NS_IF_RELEASE(imageStream);
} else {
// Treat custom types as a string of bytes.
if (!flavorStr.EqualsLiteral(kCustomTypesMime)) {
bool isRTF = flavorStr.EqualsLiteral(kRTFMime);
// we probably have some form of text. The DOM only wants LF, so
// convert from Win32 line endings to DOM line endings.
int32_t signedLen = static_cast<int32_t>(dataLen);
nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks(isRTF, &data,
&signedLen);
dataLen = signedLen;
if (isRTF) {
// RTF on Windows is known to sometimes deliver an extra null byte.
if (dataLen > 0 && static_cast<char*>(data)[dataLen - 1] == '\0') {
dataLen--;
}
}
}
nsPrimitiveHelpers::CreatePrimitiveForData(
flavorStr, data, dataLen, getter_AddRefs(genericDataWrapper));
free(data);
}
NS_ASSERTION(genericDataWrapper,
"About to put null data into the transferable");
aTransferable->SetTransferData(flavorStr.get(), genericDataWrapper);
res = NS_OK;
// we found one, get out of the loop
break;
}
} // foreach flavor
return res;
}
//
// FindPlatformHTML
//
// Someone asked for the OS CF_HTML flavor. We give it back to them exactly
// as-is.
//
bool nsClipboard ::FindPlatformHTML(IDataObject* inDataObject, UINT inIndex,
void** outData, uint32_t* outStartOfData,
uint32_t* outDataLen) {
// Reference: MSDN doc entitled "HTML Clipboard Format"
// http://msdn.microsoft.com/en-us/library/aa767917(VS.85).aspx#unknown_854
// CF_HTML is UTF8, not unicode. We also can't rely on it being
// null-terminated so we have to check the CF_HTML header for the correct
// length. The length we return is the bytecount from the beginning of the
// selected data to the end of the selected data, without the null
// termination. Because it's UTF8, we're guaranteed the header is ASCII.
if (!outData || !*outData) {
return false;
}
char version[8] = {0};
int32_t startOfData = 0;
int32_t endOfData = 0;
int numFound =
sscanf((char*)*outData, "Version:%7s\nStartHTML:%d\nEndHTML:%d", version,
&startOfData, &endOfData);
if (numFound != 3 || startOfData < -1 || endOfData < -1) {
return false;
}
// Fixup the start and end markers if they have no context (set to -1)
if (startOfData == -1) {
startOfData = 0;
}
if (endOfData == -1) {
endOfData = *outDataLen;
}
// Make sure we were passed sane values within our buffer size.
// (Note that we've handled all cases of negative endOfData above, so we can
// safely cast it to be unsigned here.)
if (!endOfData || startOfData >= endOfData ||
static_cast<uint32_t>(endOfData) > *outDataLen) {
return false;
}
// We want to return the buffer not offset by startOfData because it will be
// parsed out later (probably by HTMLEditor::ParseCFHTML) when it is still
// in CF_HTML format.
// We return the byte offset from the start of the data buffer to where the
// HTML data starts. The caller might want to extract the HTML only.
*outStartOfData = startOfData;
*outDataLen = endOfData;
return true;
}
//
// FindUnicodeFromPlainText
//
// Looks for CF_TEXT on the clipboard and converts it into an UTF-16 string
// if present. Returns this string in outData, and its length in outDataLen.
// XXXndeakin Windows converts between CF_UNICODE and CF_TEXT automatically
// so it doesn't seem like this is actually needed.
//
bool nsClipboard ::FindUnicodeFromPlainText(IDataObject* inDataObject,
UINT inIndex, void** outData,
uint32_t* outDataLen) {
MOZ_CLIPBOARD_LOG("%s", __FUNCTION__);
// We are looking for text/plain and we failed to find it on the clipboard
// first, so try again with CF_TEXT. If that is present, convert it to
// unicode.
nsresult rv = GetNativeDataOffClipboard(inDataObject, inIndex, CF_TEXT,
nullptr, outData, outDataLen);
if (NS_FAILED(rv) || !*outData) {
return false;
}
const char* castedText = static_cast<char*>(*outData);
nsAutoString tmp;
rv = NS_CopyNativeToUnicode(nsDependentCSubstring(castedText, *outDataLen),
tmp);
if (NS_FAILED(rv)) {
return false;
}
// out with the old, in with the new
free(*outData);
*outData = ToNewUnicode(tmp);
*outDataLen = tmp.Length() * sizeof(char16_t);
return true;
} // FindUnicodeFromPlainText
//
// FindURLFromLocalFile
//
// we are looking for a URL and couldn't find it, try again with looking for
// a local file. If we have one, it may either be a normal file or an internet
// shortcut. In both cases, however, we can get a URL (it will be a file:// url
// in the local file case).
//
bool nsClipboard ::FindURLFromLocalFile(IDataObject* inDataObject, UINT inIndex,
void** outData, uint32_t* outDataLen) {
MOZ_CLIPBOARD_LOG("%s", __FUNCTION__);
bool dataFound = false;
nsresult loadResult =
GetNativeDataOffClipboard(inDataObject, inIndex, GetFormat(kFileMime),
nullptr, outData, outDataLen);
if (NS_SUCCEEDED(loadResult) && *outData) {
// we have a file path in |data|. Is it an internet shortcut or a normal
// file?
const nsDependentString filepath(static_cast<char16_t*>(*outData));
nsCOMPtr<nsIFile> file;
nsresult rv = NS_NewLocalFile(filepath, getter_AddRefs(file));
if (NS_FAILED(rv)) {
free(*outData);
return dataFound;
}
if (IsInternetShortcut(filepath)) {
free(*outData);
nsAutoCString url;
ResolveShortcut(file, url);
if (!url.IsEmpty()) {
// convert it to unicode and pass it out
NS_ConvertUTF8toUTF16 urlString(url);
// the internal mozilla URL format, text/x-moz-url, contains
// URL\ntitle. We can guess the title from the file's name.
nsAutoString title;
file->GetLeafName(title);
// We rely on IsInternetShortcut check that file has a .url extension.
title.SetLength(title.Length() - 4);
if (title.IsEmpty()) {
title = urlString;
}
*outData = ToNewUnicode(urlString + u"\n"_ns + title);
*outDataLen =
NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
dataFound = true;
}
} else {
// we have a normal file, use some Necko objects to get our file path
nsAutoCString urlSpec;
NS_GetURLSpecFromFile(file, urlSpec);
// convert it to unicode and pass it out
free(*outData);
*outData = UTF8ToNewUnicode(urlSpec);
*outDataLen =
NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
dataFound = true;
} // else regular file
}
return dataFound;
} // FindURLFromLocalFile
//
// FindURLFromNativeURL
//
// we are looking for a URL and couldn't find it using our internal
// URL flavor, so look for it using the native URL flavor,
// CF_INETURLSTRW (We don't handle CF_INETURLSTRA currently)
//
bool nsClipboard ::FindURLFromNativeURL(IDataObject* inDataObject, UINT inIndex,
void** outData, uint32_t* outDataLen) {
MOZ_CLIPBOARD_LOG("%s", __FUNCTION__);
bool dataFound = false;
void* tempOutData = nullptr;
uint32_t tempDataLen = 0;
nsresult loadResult = GetNativeDataOffClipboard(
inDataObject, inIndex, ::RegisterClipboardFormat(CFSTR_INETURLW), nullptr,
&tempOutData, &tempDataLen);
if (NS_SUCCEEDED(loadResult) && tempOutData) {
nsDependentString urlString(static_cast<char16_t*>(tempOutData));
// the internal mozilla URL format, text/x-moz-url, contains
// URL\ntitle. Since we don't actually have a title here,
// just repeat the URL to fake it.
*outData = ToNewUnicode(urlString + u"\n"_ns + urlString);
*outDataLen =
NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
free(tempOutData);
dataFound = true;
} else {
loadResult = GetNativeDataOffClipboard(
inDataObject, inIndex, ::RegisterClipboardFormat(CFSTR_INETURLA),
nullptr, &tempOutData, &tempDataLen);
if (NS_SUCCEEDED(loadResult) && tempOutData) {
// CFSTR_INETURLA is (currently) equal to CFSTR_SHELLURL which is equal to
// CF_TEXT which is by definition ANSI encoded.
nsCString urlUnescapedA;
bool unescaped =
NS_UnescapeURL(static_cast<char*>(tempOutData), tempDataLen,
esc_OnlyNonASCII | esc_SkipControl, urlUnescapedA);
nsString urlString;
if (unescaped) {
NS_CopyNativeToUnicode(urlUnescapedA, urlString);
} else {
NS_CopyNativeToUnicode(
nsDependentCString(static_cast<char*>(tempOutData), tempDataLen),
urlString);
}
// the internal mozilla URL format, text/x-moz-url, contains
// URL\ntitle. Since we don't actually have a title here,
// just repeat the URL to fake it.
*outData = ToNewUnicode(urlString + u"\n"_ns + urlString);
*outDataLen =
NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
free(tempOutData);
dataFound = true;
}
}
return dataFound;
} // FindURLFromNativeURL
// Other apps can block access to the clipboard. This repeatedly
// calls `::OleGetClipboard` for a fixed number of times and should be called
// instead of `::OleGetClipboard`.
static HRESULT RepeatedlyTryOleGetClipboard(IDataObject** aDataObj) {
return RepeatedlyTry(::OleGetClipboard, LogOleGetClipboardResult, aDataObj);
}
//
// ResolveShortcut
//
void nsClipboard ::ResolveShortcut(nsIFile* aFile, nsACString& outURL) {
nsCOMPtr<nsIFileProtocolHandler> fph;
nsresult rv = NS_GetFileProtocolHandler(getter_AddRefs(fph));
if (NS_FAILED(rv)) {
return;
}
nsCOMPtr<nsIURI> uri;
rv = fph->ReadURLFile(aFile, getter_AddRefs(uri));
if (NS_FAILED(rv)) {
return;
}
uri->GetSpec(outURL);
} // ResolveShortcut
//
// IsInternetShortcut
//
// A file is an Internet Shortcut if it ends with .URL
//
bool nsClipboard ::IsInternetShortcut(const nsAString& inFileName) {
return StringEndsWith(inFileName, u".url"_ns,
nsCaseInsensitiveStringComparator);
} // IsInternetShortcut
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsClipboard::GetNativeClipboardData(nsITransferable* aTransferable,
ClipboardType aWhichClipboard) {
MOZ_DIAGNOSTIC_ASSERT(aTransferable);
MOZ_DIAGNOSTIC_ASSERT(
nsIClipboard::IsClipboardTypeSupported(aWhichClipboard));
MOZ_CLIPBOARD_LOG("%s aWhichClipboard=%i", __FUNCTION__, aWhichClipboard);
nsresult res;
// This makes sure we can use the OLE functionality for the clipboard
IDataObject* dataObj;
if (S_OK == RepeatedlyTryOleGetClipboard(&dataObj)) {
// Use OLE IDataObject for clipboard operations
MOZ_CLIPBOARD_LOG(" use OLE IDataObject:");
if (MOZ_CLIPBOARD_LOG_ENABLED()) {
IEnumFORMATETC* pEnum = nullptr;
if (S_OK == dataObj->EnumFormatEtc(DATADIR_GET, &pEnum)) {
FORMATETC fEtc;
while (S_OK == pEnum->Next(1, &fEtc, nullptr)) {
nsAutoString format;
mozilla::widget::WinUtils::GetClipboardFormatAsString(fEtc.cfFormat,
format);
MOZ_CLIPBOARD_LOG(" FORMAT %s",
NS_ConvertUTF16toUTF8(format).get());
}
}
pEnum->Release();
}
res = GetDataFromDataObject(dataObj, 0, nullptr, aTransferable);
dataObj->Release();
} else {
// do it the old manual way
res = GetDataFromDataObject(nullptr, 0, mWindow, aTransferable);
}
return res;
}
nsresult nsClipboard::EmptyNativeClipboardData(ClipboardType aWhichClipboard) {
MOZ_DIAGNOSTIC_ASSERT(
nsIClipboard::IsClipboardTypeSupported(aWhichClipboard));
// Some programs such as ZoneAlarm monitor clipboard usage and then open the
// clipboard to scan it. If we i) empty and then ii) set data, then the
// 'set data' can sometimes fail with access denied becacuse another program
// has the clipboard open. So to avoid this race condition for OpenClipboard
// we do not empty the clipboard when we're setting it.
RepeatedlyTryOleSetClipboard(nullptr);
return NS_OK;
}
mozilla::Result<int32_t, nsresult>
nsClipboard::GetNativeClipboardSequenceNumber(ClipboardType aWhichClipboard) {
MOZ_DIAGNOSTIC_ASSERT(kGlobalClipboard == aWhichClipboard);
return (int32_t)::GetClipboardSequenceNumber();
}
//-------------------------------------------------------------------------
mozilla::Result<bool, nsresult>
nsClipboard::HasNativeClipboardDataMatchingFlavors(
const nsTArray<nsCString>& aFlavorList, ClipboardType aWhichClipboard) {
MOZ_DIAGNOSTIC_ASSERT(
nsIClipboard::IsClipboardTypeSupported(aWhichClipboard));
for (const auto& flavor : aFlavorList) {
UINT format = GetFormat(flavor.get());
if (IsClipboardFormatAvailable(format)) {
return true;
}
}
return false;
}
//-------------------------------------------------------------------------
nsresult nsClipboard::GetTempFilePath(const nsAString& aFileName,
nsAString& aFilePath) {
nsresult result = NS_OK;
nsCOMPtr<nsIFile> tmpFile;
result =
GetSpecialSystemDirectory(OS_TemporaryDirectory, getter_AddRefs(tmpFile));
NS_ENSURE_SUCCESS(result, result);
result = tmpFile->Append(aFileName);
NS_ENSURE_SUCCESS(result, result);
result = tmpFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0660);
NS_ENSURE_SUCCESS(result, result);
result = tmpFile->GetPath(aFilePath);
return result;
}
//-------------------------------------------------------------------------
nsresult nsClipboard::SaveStorageOrStream(IDataObject* aDataObject, UINT aIndex,
const nsAString& aFileName) {
NS_ENSURE_ARG_POINTER(aDataObject);
FORMATETC fe = {0};
SET_FORMATETC(fe, RegisterClipboardFormat(CFSTR_FILECONTENTS), 0,
DVASPECT_CONTENT, aIndex, TYMED_ISTORAGE | TYMED_ISTREAM);
STGMEDIUM stm = {0};
HRESULT hres = aDataObject->GetData(&fe, &stm);
if (FAILED(hres)) {
return NS_ERROR_FAILURE;
}
auto releaseMediumGuard =
mozilla::MakeScopeExit([&] { ReleaseStgMedium(&stm); });
// We do this check because, even though we *asked* for IStorage or IStream,
// it seems that IDataObject providers can just hand us back whatever they
// feel like. See Bug 1824644 for a fun example of that!
if (stm.tymed != TYMED_ISTORAGE && stm.tymed != TYMED_ISTREAM) {
return NS_ERROR_FAILURE;
}
if (stm.tymed == TYMED_ISTORAGE) {
// should never happen -- but theoretically possible, given an ill-behaved
// data-source
if (stm.pstg == nullptr) {
return NS_ERROR_FAILURE;
}
RefPtr<IStorage> file;
hres = StgCreateStorageEx(
aFileName.Data(), STGM_CREATE | STGM_READWRITE | STGM_SHARE_EXCLUSIVE,
STGFMT_STORAGE, 0, NULL, NULL, IID_IStorage, getter_AddRefs(file));
if (FAILED(hres)) {
return NS_ERROR_FAILURE;
}
hres = stm.pstg->CopyTo(0, NULL, NULL, file);
if (FAILED(hres)) {
return NS_ERROR_FAILURE;
}
file->Commit(STGC_DEFAULT);
return NS_OK;
}
MOZ_ASSERT(stm.tymed == TYMED_ISTREAM);
// should never happen -- but possible given an ill-behaved data-source, and
// has been seen in the wild (bug 1895681)
if (stm.pstm == nullptr) {
return NS_ERROR_FAILURE;
}
HANDLE handle = CreateFile(aFileName.Data(), GENERIC_WRITE, FILE_SHARE_READ,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (handle == INVALID_HANDLE_VALUE) {
return NS_ERROR_FAILURE;
}
auto fileCloseGuard = mozilla::MakeScopeExit([&] { CloseHandle(handle); });
const ULONG bufferSize = 4096;
char buffer[bufferSize] = {0};
ULONG bytesRead = 0;
DWORD bytesWritten = 0;
while (true) {
HRESULT result = stm.pstm->Read(buffer, bufferSize, &bytesRead);
if (FAILED(result)) {
return NS_ERROR_FAILURE;
}
if (bytesRead == 0) {
break;
}
if (!WriteFile(handle, buffer, static_cast<DWORD>(bytesRead), &bytesWritten,
NULL)) {
return NS_ERROR_FAILURE;
}
}
return NS_OK;
}
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