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gecko-dev/widget/windows/nsDataObj.cpp

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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 "mozilla/ArrayUtils.h"
#include "mozilla/TextUtils.h"
#include <ole2.h>
#include <shlobj.h>
#include "nsDataObj.h"
#include "nsArrayUtils.h"
#include "nsClipboard.h"
#include "nsReadableUtils.h"
#include "nsITransferable.h"
#include "nsISupportsPrimitives.h"
#include "IEnumFE.h"
#include "nsPrimitiveHelpers.h"
#include "nsString.h"
#include "nsCRT.h"
#include "nsPrintfCString.h"
#include "nsIStringBundle.h"
#include "nsEscape.h"
#include "nsIURL.h"
#include "nsNetUtil.h"
#include "mozilla/Services.h"
#include "mozilla/Unused.h"
#include "nsIOutputStream.h"
#include "nscore.h"
#include "nsDirectoryServiceDefs.h"
#include "nsITimer.h"
#include "nsThreadUtils.h"
#include "mozilla/Preferences.h"
#include "nsIContentPolicy.h"
#include "nsContentUtils.h"
#include "nsIPrincipal.h"
#include "nsNativeCharsetUtils.h"
#include "nsMimeTypes.h"
#include "imgITools.h"
#include "WinUtils.h"
#include "mozilla/LazyIdleThread.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::widget;
#define BFH_LENGTH 14
#define DEFAULT_THREAD_TIMEOUT_MS 30000
NS_IMPL_ISUPPORTS(nsDataObj::CStream, nsIStreamListener)
//-----------------------------------------------------------------------------
// CStream implementation
nsDataObj::CStream::CStream() : mChannelRead(false), mStreamRead(0) {}
//-----------------------------------------------------------------------------
nsDataObj::CStream::~CStream() {}
//-----------------------------------------------------------------------------
// helper - initializes the stream
nsresult nsDataObj::CStream::Init(nsIURI* pSourceURI,
uint32_t aContentPolicyType,
nsIPrincipal* aRequestingPrincipal) {
// we can not create a channel without a requestingPrincipal
if (!aRequestingPrincipal) {
return NS_ERROR_FAILURE;
}
nsresult rv;
rv = NS_NewChannel(getter_AddRefs(mChannel), pSourceURI, aRequestingPrincipal,
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS,
aContentPolicyType,
nullptr, // nsICookieSettings
nullptr, // PerformanceStorage
nullptr, // loadGroup
nullptr, // aCallbacks
nsIRequest::LOAD_FROM_CACHE);
NS_ENSURE_SUCCESS(rv, rv);
rv = mChannel->AsyncOpen(this);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
//-----------------------------------------------------------------------------
// IUnknown's QueryInterface, nsISupport's AddRef and Release are shared by
// IUnknown and nsIStreamListener.
STDMETHODIMP nsDataObj::CStream::QueryInterface(REFIID refiid,
void** ppvResult) {
*ppvResult = nullptr;
if (IID_IUnknown == refiid || refiid == IID_IStream)
{
*ppvResult = this;
}
if (nullptr != *ppvResult) {
((LPUNKNOWN)*ppvResult)->AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
// nsIStreamListener implementation
NS_IMETHODIMP
nsDataObj::CStream::OnDataAvailable(
nsIRequest* aRequest, nsIInputStream* aInputStream,
uint64_t aOffset, // offset within the stream
uint32_t aCount) // bytes available on this call
{
// Extend the write buffer for the incoming data.
uint8_t* buffer = mChannelData.AppendElements(aCount, fallible);
if (!buffer) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ASSERTION((mChannelData.Length() == (aOffset + aCount)),
"stream length mismatch w/write buffer");
// Read() may not return aCount on a single call, so loop until we've
// accumulated all the data OnDataAvailable has promised.
nsresult rv;
uint32_t odaBytesReadTotal = 0;
do {
uint32_t bytesReadByCall = 0;
rv = aInputStream->Read((char*)(buffer + odaBytesReadTotal), aCount,
&bytesReadByCall);
odaBytesReadTotal += bytesReadByCall;
} while (aCount < odaBytesReadTotal && NS_SUCCEEDED(rv));
return rv;
}
NS_IMETHODIMP nsDataObj::CStream::OnStartRequest(nsIRequest* aRequest) {
mChannelResult = NS_OK;
return NS_OK;
}
NS_IMETHODIMP nsDataObj::CStream::OnStopRequest(nsIRequest* aRequest,
nsresult aStatusCode) {
mChannelRead = true;
mChannelResult = aStatusCode;
return NS_OK;
}
// Pumps thread messages while waiting for the async listener operation to
// complete. Failing this call will fail the stream incall from Windows
// and cancel the operation.
nsresult nsDataObj::CStream::WaitForCompletion() {
// We are guaranteed OnStopRequest will get called, so this should be ok.
SpinEventLoopUntil([&]() { return mChannelRead; });
if (!mChannelData.Length()) mChannelResult = NS_ERROR_FAILURE;
return mChannelResult;
}
//-----------------------------------------------------------------------------
// IStream
STDMETHODIMP nsDataObj::CStream::Clone(IStream** ppStream) { return E_NOTIMPL; }
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::Commit(DWORD dwFrags) { return E_NOTIMPL; }
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::CopyTo(IStream* pDestStream,
ULARGE_INTEGER nBytesToCopy,
ULARGE_INTEGER* nBytesRead,
ULARGE_INTEGER* nBytesWritten) {
return E_NOTIMPL;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::LockRegion(ULARGE_INTEGER nStart,
ULARGE_INTEGER nBytes,
DWORD dwFlags) {
return E_NOTIMPL;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::Read(void* pvBuffer, ULONG nBytesToRead,
ULONG* nBytesRead) {
// Wait for the write into our buffer to complete via the stream listener.
// We can't respond to this by saying "call us back later".
if (NS_FAILED(WaitForCompletion())) return E_FAIL;
// Bytes left for Windows to read out of our buffer
ULONG bytesLeft = mChannelData.Length() - mStreamRead;
// Let Windows know what we will hand back, usually this is the entire buffer
*nBytesRead = std::min(bytesLeft, nBytesToRead);
// Copy the buffer data over
memcpy(pvBuffer, ((char*)mChannelData.Elements() + mStreamRead), *nBytesRead);
// Update our bytes read tracking
mStreamRead += *nBytesRead;
return S_OK;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::Revert(void) { return E_NOTIMPL; }
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::Seek(LARGE_INTEGER nMove, DWORD dwOrigin,
ULARGE_INTEGER* nNewPos) {
if (nNewPos == nullptr) return STG_E_INVALIDPOINTER;
if (nMove.LowPart == 0 && nMove.HighPart == 0 &&
(dwOrigin == STREAM_SEEK_SET || dwOrigin == STREAM_SEEK_CUR)) {
nNewPos->LowPart = 0;
nNewPos->HighPart = 0;
return S_OK;
}
return E_NOTIMPL;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::SetSize(ULARGE_INTEGER nNewSize) {
return E_NOTIMPL;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::Stat(STATSTG* statstg, DWORD dwFlags) {
if (statstg == nullptr) return STG_E_INVALIDPOINTER;
if (!mChannel || NS_FAILED(WaitForCompletion())) return E_FAIL;
memset((void*)statstg, 0, sizeof(STATSTG));
if (dwFlags != STATFLAG_NONAME) {
nsCOMPtr<nsIURI> sourceURI;
if (NS_FAILED(mChannel->GetURI(getter_AddRefs(sourceURI)))) {
return E_FAIL;
}
nsAutoCString strFileName;
nsCOMPtr<nsIURL> sourceURL = do_QueryInterface(sourceURI);
sourceURL->GetFileName(strFileName);
if (strFileName.IsEmpty()) return E_FAIL;
NS_UnescapeURL(strFileName);
NS_ConvertUTF8toUTF16 wideFileName(strFileName);
uint32_t nMaxNameLength = (wideFileName.Length() * 2) + 2;
void* retBuf = CoTaskMemAlloc(nMaxNameLength); // freed by caller
if (!retBuf) return STG_E_INSUFFICIENTMEMORY;
ZeroMemory(retBuf, nMaxNameLength);
memcpy(retBuf, wideFileName.get(), wideFileName.Length() * 2);
statstg->pwcsName = (LPOLESTR)retBuf;
}
SYSTEMTIME st;
statstg->type = STGTY_STREAM;
GetSystemTime(&st);
SystemTimeToFileTime((const SYSTEMTIME*)&st, (LPFILETIME)&statstg->mtime);
statstg->ctime = statstg->atime = statstg->mtime;
statstg->cbSize.LowPart = (DWORD)mChannelData.Length();
statstg->grfMode = STGM_READ;
statstg->grfLocksSupported = LOCK_ONLYONCE;
statstg->clsid = CLSID_NULL;
return S_OK;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::UnlockRegion(ULARGE_INTEGER nStart,
ULARGE_INTEGER nBytes,
DWORD dwFlags) {
return E_NOTIMPL;
}
//-----------------------------------------------------------------------------
STDMETHODIMP nsDataObj::CStream::Write(const void* pvBuffer, ULONG nBytesToRead,
ULONG* nBytesRead) {
return E_NOTIMPL;
}
//-----------------------------------------------------------------------------
HRESULT nsDataObj::CreateStream(IStream** outStream) {
NS_ENSURE_TRUE(outStream, E_INVALIDARG);
nsresult rv = NS_ERROR_FAILURE;
nsAutoString wideFileName;
nsCOMPtr<nsIURI> sourceURI;
HRESULT res;
res = GetDownloadDetails(getter_AddRefs(sourceURI), wideFileName);
if (FAILED(res)) return res;
nsDataObj::CStream* pStream = new nsDataObj::CStream();
NS_ENSURE_TRUE(pStream, E_OUTOFMEMORY);
pStream->AddRef();
// query the requestingPrincipal from the transferable and add it to the new
// channel
nsCOMPtr<nsIPrincipal> requestingPrincipal =
mTransferable->GetRequestingPrincipal();
MOZ_ASSERT(requestingPrincipal, "can not create channel without a principal");
uint32_t contentPolicyType = mTransferable->GetContentPolicyType();
rv = pStream->Init(sourceURI, contentPolicyType, requestingPrincipal);
if (NS_FAILED(rv)) {
pStream->Release();
return E_FAIL;
}
*outStream = pStream;
return S_OK;
}
/*
* deliberately not using MAX_PATH. This is because on platforms < XP
* a file created with a long filename may be mishandled by the shell
* resulting in it not being able to be deleted or moved.
* See bug 250392 for more details.
*/
#define NS_MAX_FILEDESCRIPTOR 128 + 1
/*
* Class nsDataObj
*/
//-----------------------------------------------------
// construction
//-----------------------------------------------------
nsDataObj::nsDataObj(nsIURI* uri)
: m_cRef(0),
mTransferable(nullptr),
mIsAsyncMode(FALSE),
mIsInOperation(FALSE) {
mIOThread = new LazyIdleThread(DEFAULT_THREAD_TIMEOUT_MS,
NS_LITERAL_CSTRING("nsDataObj"),
LazyIdleThread::ManualShutdown);
m_enumFE = new CEnumFormatEtc();
m_enumFE->AddRef();
if (uri) {
// A URI was obtained, so pass this through to the DataObject
// so it can create a SourceURL for CF_HTML flavour
uri->GetSpec(mSourceURL);
}
}
//-----------------------------------------------------
// destruction
//-----------------------------------------------------
nsDataObj::~nsDataObj() {
NS_IF_RELEASE(mTransferable);
mDataFlavors.Clear();
m_enumFE->Release();
// Free arbitrary system formats
for (uint32_t idx = 0; idx < mDataEntryList.Length(); idx++) {
CoTaskMemFree(mDataEntryList[idx]->fe.ptd);
ReleaseStgMedium(&mDataEntryList[idx]->stgm);
CoTaskMemFree(mDataEntryList[idx]);
}
}
//-----------------------------------------------------
// IUnknown interface methods - see inknown.h for documentation
//-----------------------------------------------------
STDMETHODIMP nsDataObj::QueryInterface(REFIID riid, void** ppv) {
*ppv = nullptr;
if ((IID_IUnknown == riid) || (IID_IDataObject == riid)) {
*ppv = this;
AddRef();
return S_OK;
} else if (IID_IDataObjectAsyncCapability == riid) {
*ppv = static_cast<IDataObjectAsyncCapability*>(this);
AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
//-----------------------------------------------------
STDMETHODIMP_(ULONG) nsDataObj::AddRef() {
++m_cRef;
NS_LOG_ADDREF(this, m_cRef, "nsDataObj", sizeof(*this));
return m_cRef;
}
namespace {
class RemoveTempFileHelper final : public nsIObserver {
public:
explicit RemoveTempFileHelper(nsIFile* aTempFile) : mTempFile(aTempFile) {
MOZ_ASSERT(mTempFile);
}
// The attach method is seperate from the constructor as we may be addref-ing
// ourself, and we want to be sure someone has a strong reference to us.
void Attach() {
// We need to listen to both the xpcom shutdown message and our timer, and
// fire when the first of either of these two messages is received.
nsresult rv;
rv = NS_NewTimerWithObserver(getter_AddRefs(mTimer), this, 500,
nsITimer::TYPE_ONE_SHOT);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
nsCOMPtr<nsIObserverService> observerService =
do_GetService("@mozilla.org/observer-service;1");
if (NS_WARN_IF(!observerService)) {
mTimer->Cancel();
mTimer = nullptr;
return;
}
observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
}
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
private:
~RemoveTempFileHelper() {
if (mTempFile) {
mTempFile->Remove(false);
}
}
nsCOMPtr<nsIFile> mTempFile;
nsCOMPtr<nsITimer> mTimer;
};
NS_IMPL_ISUPPORTS(RemoveTempFileHelper, nsIObserver);
NS_IMETHODIMP
RemoveTempFileHelper::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
// Let's be careful and make sure that we don't die immediately
RefPtr<RemoveTempFileHelper> grip = this;
// Make sure that we aren't called again by destroying references to ourself.
nsCOMPtr<nsIObserverService> observerService =
do_GetService("@mozilla.org/observer-service;1");
if (observerService) {
observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
if (mTimer) {
mTimer->Cancel();
mTimer = nullptr;
}
// Remove the tempfile
if (mTempFile) {
mTempFile->Remove(false);
mTempFile = nullptr;
}
return NS_OK;
}
} // namespace
//-----------------------------------------------------
STDMETHODIMP_(ULONG) nsDataObj::Release() {
--m_cRef;
NS_LOG_RELEASE(this, m_cRef, "nsDataObj");
if (0 != m_cRef) return m_cRef;
// We have released our last ref on this object and need to delete the
// temp file. External app acting as drop target may still need to open the
// temp file. Addref a timer so it can delay deleting file and destroying
// this object.
if (mCachedTempFile) {
RefPtr<RemoveTempFileHelper> helper =
new RemoveTempFileHelper(mCachedTempFile);
mCachedTempFile = nullptr;
helper->Attach();
}
delete this;
return 0;
}
//-----------------------------------------------------
BOOL nsDataObj::FormatsMatch(const FORMATETC& source,
const FORMATETC& target) const {
if ((source.cfFormat == target.cfFormat) &&
(source.dwAspect & target.dwAspect) && (source.tymed & target.tymed)) {
return TRUE;
} else {
return FALSE;
}
}
//-----------------------------------------------------
// IDataObject methods
//-----------------------------------------------------
STDMETHODIMP nsDataObj::GetData(LPFORMATETC aFormat, LPSTGMEDIUM pSTM) {
if (!mTransferable) return DV_E_FORMATETC;
uint32_t dfInx = 0;
static CLIPFORMAT fileDescriptorFlavorA =
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA);
static CLIPFORMAT fileDescriptorFlavorW =
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
static CLIPFORMAT uniformResourceLocatorA =
::RegisterClipboardFormat(CFSTR_INETURLA);
static CLIPFORMAT uniformResourceLocatorW =
::RegisterClipboardFormat(CFSTR_INETURLW);
static CLIPFORMAT fileFlavor = ::RegisterClipboardFormat(CFSTR_FILECONTENTS);
static CLIPFORMAT PreferredDropEffect =
::RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT);
// Arbitrary system formats are used for image feedback during drag
// and drop. We are responsible for storing these internally during
// drag operations.
LPDATAENTRY pde;
if (LookupArbitraryFormat(aFormat, &pde, FALSE)) {
return CopyMediumData(pSTM, &pde->stgm, aFormat, FALSE) ? S_OK
: E_UNEXPECTED;
}
// Firefox internal formats
ULONG count;
FORMATETC fe;
m_enumFE->Reset();
while (NOERROR == m_enumFE->Next(1, &fe, &count) &&
dfInx < mDataFlavors.Length()) {
nsCString& df = mDataFlavors.ElementAt(dfInx);
if (FormatsMatch(fe, *aFormat)) {
pSTM->pUnkForRelease =
nullptr; // caller is responsible for deleting this data
CLIPFORMAT format = aFormat->cfFormat;
switch (format) {
// Someone is asking for plain or unicode text
case CF_TEXT:
case CF_UNICODETEXT:
return GetText(df, *aFormat, *pSTM);
// Some 3rd party apps that receive drag and drop files from the browser
// window require support for this.
case CF_HDROP:
return GetFile(*aFormat, *pSTM);
// Someone is asking for an image
case CF_DIBV5:
case CF_DIB:
return GetDib(df, *aFormat, *pSTM);
default:
if (format == fileDescriptorFlavorA)
return GetFileDescriptor(*aFormat, *pSTM, false);
if (format == fileDescriptorFlavorW)
return GetFileDescriptor(*aFormat, *pSTM, true);
if (format == uniformResourceLocatorA)
return GetUniformResourceLocator(*aFormat, *pSTM, false);
if (format == uniformResourceLocatorW)
return GetUniformResourceLocator(*aFormat, *pSTM, true);
if (format == fileFlavor) return GetFileContents(*aFormat, *pSTM);
if (format == PreferredDropEffect)
return GetPreferredDropEffect(*aFormat, *pSTM);
// MOZ_LOG(gWindowsLog, LogLevel::Info,
// ("***** nsDataObj::GetData - Unknown format %u\n", format));
return GetText(df, *aFormat, *pSTM);
} // switch
} // if
dfInx++;
} // while
return DATA_E_FORMATETC;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::GetDataHere(LPFORMATETC pFE, LPSTGMEDIUM pSTM) {
return E_FAIL;
}
//-----------------------------------------------------
// Other objects querying to see if we support a
// particular format
//-----------------------------------------------------
STDMETHODIMP nsDataObj::QueryGetData(LPFORMATETC pFE) {
// Arbitrary system formats are used for image feedback during drag
// and drop. We are responsible for storing these internally during
// drag operations.
LPDATAENTRY pde;
if (LookupArbitraryFormat(pFE, &pde, FALSE)) return S_OK;
// Firefox internal formats
ULONG count;
FORMATETC fe;
m_enumFE->Reset();
while (NOERROR == m_enumFE->Next(1, &fe, &count)) {
if (fe.cfFormat == pFE->cfFormat) {
return S_OK;
}
}
return E_FAIL;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::GetCanonicalFormatEtc(LPFORMATETC pFEIn,
LPFORMATETC pFEOut) {
return E_NOTIMPL;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::SetData(LPFORMATETC aFormat, LPSTGMEDIUM aMedium,
BOOL shouldRel) {
// Arbitrary system formats are used for image feedback during drag
// and drop. We are responsible for storing these internally during
// drag operations.
LPDATAENTRY pde;
if (LookupArbitraryFormat(aFormat, &pde, TRUE)) {
// Release the old data the lookup handed us for this format. This
// may have been set in CopyMediumData when we originally stored the
// data.
if (pde->stgm.tymed) {
ReleaseStgMedium(&pde->stgm);
memset(&pde->stgm, 0, sizeof(STGMEDIUM));
}
bool result = true;
if (shouldRel) {
// If shouldRel is TRUE, the data object called owns the storage medium
// after the call returns. Store the incoming data in our data array for
// release when we are destroyed. This is the common case with arbitrary
// data from explorer.
pde->stgm = *aMedium;
} else {
// Copy the incoming data into our data array. (AFAICT, this never gets
// called with arbitrary formats for drag images.)
result = CopyMediumData(&pde->stgm, aMedium, aFormat, TRUE);
}
pde->fe.tymed = pde->stgm.tymed;
return result ? S_OK : DV_E_TYMED;
}
if (shouldRel) ReleaseStgMedium(aMedium);
return S_OK;
}
bool nsDataObj::LookupArbitraryFormat(FORMATETC* aFormat,
LPDATAENTRY* aDataEntry,
BOOL aAddorUpdate) {
*aDataEntry = nullptr;
if (aFormat->ptd != nullptr) return false;
// See if it's already in our list. If so return the data entry.
for (uint32_t idx = 0; idx < mDataEntryList.Length(); idx++) {
if (mDataEntryList[idx]->fe.cfFormat == aFormat->cfFormat &&
mDataEntryList[idx]->fe.dwAspect == aFormat->dwAspect &&
mDataEntryList[idx]->fe.lindex == aFormat->lindex) {
if (aAddorUpdate || (mDataEntryList[idx]->fe.tymed & aFormat->tymed)) {
// If the caller requests we update, or if the
// medium type matches, return the entry.
*aDataEntry = mDataEntryList[idx];
return true;
} else {
// Medium does not match, not found.
return false;
}
}
}
if (!aAddorUpdate) return false;
// Add another entry to mDataEntryList
LPDATAENTRY dataEntry = (LPDATAENTRY)CoTaskMemAlloc(sizeof(DATAENTRY));
if (!dataEntry) return false;
dataEntry->fe = *aFormat;
*aDataEntry = dataEntry;
memset(&dataEntry->stgm, 0, sizeof(STGMEDIUM));
// Add this to our IEnumFORMATETC impl. so we can return it when
// it's requested.
m_enumFE->AddFormatEtc(aFormat);
// Store a copy internally in the arbitrary formats array.
mDataEntryList.AppendElement(dataEntry);
return true;
}
bool nsDataObj::CopyMediumData(STGMEDIUM* aMediumDst, STGMEDIUM* aMediumSrc,
LPFORMATETC aFormat, BOOL aSetData) {
STGMEDIUM stgmOut = *aMediumSrc;
switch (stgmOut.tymed) {
case TYMED_ISTREAM:
stgmOut.pstm->AddRef();
break;
case TYMED_ISTORAGE:
stgmOut.pstg->AddRef();
break;
case TYMED_HGLOBAL:
if (!aMediumSrc->pUnkForRelease) {
if (aSetData) {
if (aMediumSrc->tymed != TYMED_HGLOBAL) return false;
stgmOut.hGlobal =
OleDuplicateData(aMediumSrc->hGlobal, aFormat->cfFormat, 0);
if (!stgmOut.hGlobal) return false;
} else {
// We are returning this data from LookupArbitraryFormat, indicate to
// the shell we hold it and will free it.
stgmOut.pUnkForRelease = static_cast<IDataObject*>(this);
}
}
break;
default:
return false;
}
if (stgmOut.pUnkForRelease) stgmOut.pUnkForRelease->AddRef();
*aMediumDst = stgmOut;
return true;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::EnumFormatEtc(DWORD dwDir, LPENUMFORMATETC* ppEnum) {
switch (dwDir) {
case DATADIR_GET:
m_enumFE->Clone(ppEnum);
break;
case DATADIR_SET:
// fall through
default:
*ppEnum = nullptr;
} // switch
if (nullptr == *ppEnum) return E_FAIL;
(*ppEnum)->Reset();
// Clone already AddRefed the result so don't addref it again.
return NOERROR;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::DAdvise(LPFORMATETC pFE, DWORD dwFlags,
LPADVISESINK pIAdviseSink, DWORD* pdwConn) {
return OLE_E_ADVISENOTSUPPORTED;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::DUnadvise(DWORD dwConn) {
return OLE_E_ADVISENOTSUPPORTED;
}
//-----------------------------------------------------
STDMETHODIMP nsDataObj::EnumDAdvise(LPENUMSTATDATA* ppEnum) {
return OLE_E_ADVISENOTSUPPORTED;
}
// IDataObjectAsyncCapability methods
STDMETHODIMP nsDataObj::EndOperation(HRESULT hResult, IBindCtx* pbcReserved,
DWORD dwEffects) {
mIsInOperation = FALSE;
return S_OK;
}
STDMETHODIMP nsDataObj::GetAsyncMode(BOOL* pfIsOpAsync) {
*pfIsOpAsync = mIsAsyncMode;
return S_OK;
}
STDMETHODIMP nsDataObj::InOperation(BOOL* pfInAsyncOp) {
*pfInAsyncOp = mIsInOperation;
return S_OK;
}
STDMETHODIMP nsDataObj::SetAsyncMode(BOOL fDoOpAsync) {
mIsAsyncMode = fDoOpAsync;
return S_OK;
}
STDMETHODIMP nsDataObj::StartOperation(IBindCtx* pbcReserved) {
mIsInOperation = TRUE;
return S_OK;
}
//
// GetDIB
//
// Someone is asking for a bitmap. The data in the transferable will be a
// straight imgIContainer, so just QI it.
//
HRESULT
nsDataObj::GetDib(const nsACString& inFlavor, FORMATETC& aFormat,
STGMEDIUM& aSTG) {
nsCOMPtr<nsISupports> genericDataWrapper;
if (NS_FAILED(
mTransferable->GetTransferData(PromiseFlatCString(inFlavor).get(),
getter_AddRefs(genericDataWrapper)))) {
return E_FAIL;
}
nsCOMPtr<imgIContainer> image = do_QueryInterface(genericDataWrapper);
if (!image) {
return E_FAIL;
}
nsCOMPtr<imgITools> imgTools =
do_CreateInstance("@mozilla.org/image/tools;1");
nsAutoString options(NS_LITERAL_STRING("bpp=32;"));
if (aFormat.cfFormat == CF_DIBV5) {
options.AppendLiteral("version=5");
} else {
options.AppendLiteral("version=3");
}
nsCOMPtr<nsIInputStream> inputStream;
nsresult rv = imgTools->EncodeImage(image, NS_LITERAL_CSTRING(IMAGE_BMP),
options, getter_AddRefs(inputStream));
if (NS_FAILED(rv) || !inputStream) {
return E_FAIL;
}
nsCOMPtr<imgIEncoder> encoder = do_QueryInterface(inputStream);
if (!encoder) {
return E_FAIL;
}
uint32_t size = 0;
rv = encoder->GetImageBufferUsed(&size);
if (NS_FAILED(rv) || size <= BFH_LENGTH) {
return E_FAIL;
}
char* src = nullptr;
rv = encoder->GetImageBuffer(&src);
if (NS_FAILED(rv) || !src) {
return E_FAIL;
}
// We don't want the file header.
src += BFH_LENGTH;
size -= BFH_LENGTH;
HGLOBAL glob = ::GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT, size);
if (!glob) {
return E_FAIL;
}
char* dst = (char*)::GlobalLock(glob);
::CopyMemory(dst, src, size);
::GlobalUnlock(glob);
aSTG.hGlobal = glob;
aSTG.tymed = TYMED_HGLOBAL;
return S_OK;
}
//
// GetFileDescriptor
//
HRESULT
nsDataObj ::GetFileDescriptor(FORMATETC& aFE, STGMEDIUM& aSTG,
bool aIsUnicode) {
HRESULT res = S_OK;
// How we handle this depends on if we're dealing with an internet
// shortcut, since those are done under the covers.
if (IsFlavourPresent(kFilePromiseMime) || IsFlavourPresent(kFileMime)) {
if (aIsUnicode)
return GetFileDescriptor_IStreamW(aFE, aSTG);
else
return GetFileDescriptor_IStreamA(aFE, aSTG);
} else if (IsFlavourPresent(kURLMime)) {
if (aIsUnicode)
res = GetFileDescriptorInternetShortcutW(aFE, aSTG);
else
res = GetFileDescriptorInternetShortcutA(aFE, aSTG);
} else
NS_WARNING("Not yet implemented\n");
return res;
} // GetFileDescriptor
//
HRESULT
nsDataObj ::GetFileContents(FORMATETC& aFE, STGMEDIUM& aSTG) {
HRESULT res = S_OK;
// How we handle this depends on if we're dealing with an internet
// shortcut, since those are done under the covers.
if (IsFlavourPresent(kFilePromiseMime) || IsFlavourPresent(kFileMime))
return GetFileContents_IStream(aFE, aSTG);
else if (IsFlavourPresent(kURLMime))
return GetFileContentsInternetShortcut(aFE, aSTG);
else
NS_WARNING("Not yet implemented\n");
return res;
} // GetFileContents
//
// Given a unicode string, we ensure that it contains only characters which are
// valid within the file system. Remove all forbidden characters from the name,
// and completely disallow any title that starts with a forbidden name and
// extension (e.g. "nul" is invalid, but "nul." and "nul.txt" are also invalid
// and will cause problems).
//
// It would seem that this is more functionality suited to being in nsIFile.
//
static void MangleTextToValidFilename(nsString& aText) {
static const char* forbiddenNames[] = {
"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8",
"COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7",
"LPT8", "LPT9", "CON", "PRN", "AUX", "NUL", "CLOCK$"};
aText.StripChars(FILE_PATH_SEPARATOR FILE_ILLEGAL_CHARACTERS);
aText.CompressWhitespace(true, true);
uint32_t nameLen;
for (size_t n = 0; n < ArrayLength(forbiddenNames); ++n) {
nameLen = (uint32_t)strlen(forbiddenNames[n]);
if (aText.EqualsIgnoreCase(forbiddenNames[n], nameLen)) {
// invalid name is either the entire string, or a prefix with a period
if (aText.Length() == nameLen || aText.CharAt(nameLen) == char16_t('.')) {
aText.Truncate();
break;
}
}
}
}
//
// Given a unicode string, convert it down to a valid local charset filename
// with the supplied extension. This ensures that we do not cut MBCS characters
// in the middle.
//
// It would seem that this is more functionality suited to being in nsIFile.
//
static bool CreateFilenameFromTextA(nsString& aText, const char* aExtension,
char* aFilename, uint32_t aFilenameLen) {
// ensure that the supplied name doesn't have invalid characters. If
// a valid mangled filename couldn't be created then it will leave the
// text empty.
MangleTextToValidFilename(aText);
if (aText.IsEmpty()) return false;
// repeatably call WideCharToMultiByte as long as the title doesn't fit in the
// buffer available to us. Continually reduce the length of the source title
// until the MBCS version will fit in the buffer with room for the supplied
// extension. Doing it this way ensures that even in MBCS environments there
// will be a valid MBCS filename of the correct length.
int maxUsableFilenameLen =
aFilenameLen - strlen(aExtension) - 1; // space for ext + null byte
int currLen, textLen = (int)std::min(aText.Length(), aFilenameLen);
char defaultChar = '_';
do {
currLen = WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK | WC_DEFAULTCHAR,
aText.get(), textLen--, aFilename,
maxUsableFilenameLen, &defaultChar, nullptr);
} while (currLen == 0 && textLen > 0 &&
GetLastError() == ERROR_INSUFFICIENT_BUFFER);
if (currLen > 0 && textLen > 0) {
strcpy(&aFilename[currLen], aExtension);
return true;
} else {
// empty names aren't permitted
return false;
}
}
static bool CreateFilenameFromTextW(nsString& aText, const wchar_t* aExtension,
wchar_t* aFilename, uint32_t aFilenameLen) {
// ensure that the supplied name doesn't have invalid characters. If
// a valid mangled filename couldn't be created then it will leave the
// text empty.
MangleTextToValidFilename(aText);
if (aText.IsEmpty()) return false;
const int extensionLen = wcslen(aExtension);
if (aText.Length() + extensionLen + 1 > aFilenameLen)
aText.Truncate(aFilenameLen - extensionLen - 1);
wcscpy(&aFilename[0], aText.get());
wcscpy(&aFilename[aText.Length()], aExtension);
return true;
}
#define PAGEINFO_PROPERTIES "chrome://navigator/locale/pageInfo.properties"
static bool GetLocalizedString(const char* aName, nsAString& aString) {
nsCOMPtr<nsIStringBundleService> stringService =
mozilla::services::GetStringBundleService();
if (!stringService) return false;
nsCOMPtr<nsIStringBundle> stringBundle;
nsresult rv = stringService->CreateBundle(PAGEINFO_PROPERTIES,
getter_AddRefs(stringBundle));
if (NS_FAILED(rv)) return false;
rv = stringBundle->GetStringFromName(aName, aString);
return NS_SUCCEEDED(rv);
}
//
// GetFileDescriptorInternetShortcut
//
// Create the special format for an internet shortcut and build up the data
// structures the shell is expecting.
//
HRESULT
nsDataObj ::GetFileDescriptorInternetShortcutA(FORMATETC& aFE,
STGMEDIUM& aSTG) {
// get the title of the shortcut
nsAutoString title;
if (NS_FAILED(ExtractShortcutTitle(title))) return E_OUTOFMEMORY;
HGLOBAL fileGroupDescHandle =
::GlobalAlloc(GMEM_ZEROINIT | GMEM_SHARE, sizeof(FILEGROUPDESCRIPTORA));
if (!fileGroupDescHandle) return E_OUTOFMEMORY;
LPFILEGROUPDESCRIPTORA fileGroupDescA =
reinterpret_cast<LPFILEGROUPDESCRIPTORA>(
::GlobalLock(fileGroupDescHandle));
if (!fileGroupDescA) {
::GlobalFree(fileGroupDescHandle);
return E_OUTOFMEMORY;
}
// get a valid filename in the following order: 1) from the page title,
// 2) localized string for an untitled page, 3) just use "Untitled.URL"
if (!CreateFilenameFromTextA(title, ".URL", fileGroupDescA->fgd[0].cFileName,
NS_MAX_FILEDESCRIPTOR)) {
nsAutoString untitled;
if (!GetLocalizedString("noPageTitle", untitled) ||
!CreateFilenameFromTextA(untitled, ".URL",
fileGroupDescA->fgd[0].cFileName,
NS_MAX_FILEDESCRIPTOR)) {
strcpy(fileGroupDescA->fgd[0].cFileName, "Untitled.URL");
}
}
// one file in the file block
fileGroupDescA->cItems = 1;
fileGroupDescA->fgd[0].dwFlags = FD_LINKUI;
::GlobalUnlock(fileGroupDescHandle);
aSTG.hGlobal = fileGroupDescHandle;
aSTG.tymed = TYMED_HGLOBAL;
return S_OK;
} // GetFileDescriptorInternetShortcutA
HRESULT
nsDataObj ::GetFileDescriptorInternetShortcutW(FORMATETC& aFE,
STGMEDIUM& aSTG) {
// get the title of the shortcut
nsAutoString title;
if (NS_FAILED(ExtractShortcutTitle(title))) return E_OUTOFMEMORY;
HGLOBAL fileGroupDescHandle =
::GlobalAlloc(GMEM_ZEROINIT | GMEM_SHARE, sizeof(FILEGROUPDESCRIPTORW));
if (!fileGroupDescHandle) return E_OUTOFMEMORY;
LPFILEGROUPDESCRIPTORW fileGroupDescW =
reinterpret_cast<LPFILEGROUPDESCRIPTORW>(
::GlobalLock(fileGroupDescHandle));
if (!fileGroupDescW) {
::GlobalFree(fileGroupDescHandle);
return E_OUTOFMEMORY;
}
// get a valid filename in the following order: 1) from the page title,
// 2) localized string for an untitled page, 3) just use "Untitled.URL"
if (!CreateFilenameFromTextW(title, L".URL", fileGroupDescW->fgd[0].cFileName,
NS_MAX_FILEDESCRIPTOR)) {
nsAutoString untitled;
if (!GetLocalizedString("noPageTitle", untitled) ||
!CreateFilenameFromTextW(untitled, L".URL",
fileGroupDescW->fgd[0].cFileName,
NS_MAX_FILEDESCRIPTOR)) {
wcscpy(fileGroupDescW->fgd[0].cFileName, L"Untitled.URL");
}
}
// one file in the file block
fileGroupDescW->cItems = 1;
fileGroupDescW->fgd[0].dwFlags = FD_LINKUI;
::GlobalUnlock(fileGroupDescHandle);
aSTG.hGlobal = fileGroupDescHandle;
aSTG.tymed = TYMED_HGLOBAL;
return S_OK;
} // GetFileDescriptorInternetShortcutW
//
// GetFileContentsInternetShortcut
//
// Create the special format for an internet shortcut and build up the data
// structures the shell is expecting.
//
HRESULT
nsDataObj ::GetFileContentsInternetShortcut(FORMATETC& aFE, STGMEDIUM& aSTG) {
static const char* kShellIconPref = "browser.shell.shortcutFavicons";
nsAutoString url;
if (NS_FAILED(ExtractShortcutURL(url))) return E_OUTOFMEMORY;
nsCOMPtr<nsIURI> aUri;
nsresult rv = NS_NewURI(getter_AddRefs(aUri), url);
if (NS_FAILED(rv)) {
return E_FAIL;
}
nsAutoCString asciiUrl;
rv = aUri->GetAsciiSpec(asciiUrl);
if (NS_FAILED(rv)) {
return E_FAIL;
}
const char* shortcutFormatStr;
int totalLen;
nsCString asciiPath;
if (!Preferences::GetBool(kShellIconPref, true)) {
shortcutFormatStr = "[InternetShortcut]\r\nURL=%s\r\n";
const int formatLen = strlen(shortcutFormatStr) - 2; // don't include %s
totalLen = formatLen + asciiUrl.Length(); // don't include null character
} else {
nsCOMPtr<nsIFile> icoFile;
nsAutoString aUriHash;
mozilla::widget::FaviconHelper::ObtainCachedIconFile(aUri, aUriHash,
mIOThread, true);
rv = mozilla::widget::FaviconHelper::GetOutputIconPath(aUri, icoFile, true);
NS_ENSURE_SUCCESS(rv, E_FAIL);
nsString path;
rv = icoFile->GetPath(path);
NS_ENSURE_SUCCESS(rv, E_FAIL);
if (IsAsciiNullTerminated(static_cast<const char16_t*>(path.get()))) {
LossyCopyUTF16toASCII(path, asciiPath);
shortcutFormatStr =
"[InternetShortcut]\r\nURL=%s\r\n"
"IDList=\r\nHotKey=0\r\nIconFile=%s\r\n"
"IconIndex=0\r\n";
} else {
int len =
WideCharToMultiByte(CP_UTF7, 0, char16ptr_t(path.BeginReading()),
path.Length(), nullptr, 0, nullptr, nullptr);
NS_ENSURE_TRUE(len > 0, E_FAIL);
asciiPath.SetLength(len);
WideCharToMultiByte(CP_UTF7, 0, char16ptr_t(path.BeginReading()),
path.Length(), asciiPath.BeginWriting(), len, nullptr,
nullptr);
shortcutFormatStr =
"[InternetShortcut]\r\nURL=%s\r\n"
"IDList=\r\nHotKey=0\r\nIconIndex=0\r\n"
"[InternetShortcut.W]\r\nIconFile=%s\r\n";
}
const int formatLen = strlen(shortcutFormatStr) - 2 * 2; // no %s twice
totalLen = formatLen + asciiUrl.Length() +
asciiPath.Length(); // we don't want a null character on the end
}
// create a global memory area and build up the file contents w/in it
HGLOBAL hGlobalMemory = ::GlobalAlloc(GMEM_SHARE, totalLen);
if (!hGlobalMemory) return E_OUTOFMEMORY;
char* contents = reinterpret_cast<char*>(::GlobalLock(hGlobalMemory));
if (!contents) {
::GlobalFree(hGlobalMemory);
return E_OUTOFMEMORY;
}
// NOTE: we intentionally use the Microsoft version of snprintf here because
// it does NOT null
// terminate strings which reach the maximum size of the buffer. Since we know
// that the formatted length here is totalLen, this call to _snprintf will
// format the string into the buffer without appending the null character.
if (!Preferences::GetBool(kShellIconPref, true)) {
_snprintf(contents, totalLen, shortcutFormatStr, asciiUrl.get());
} else {
_snprintf(contents, totalLen, shortcutFormatStr, asciiUrl.get(),
asciiPath.get());
}
::GlobalUnlock(hGlobalMemory);
aSTG.hGlobal = hGlobalMemory;
aSTG.tymed = TYMED_HGLOBAL;
return S_OK;
} // GetFileContentsInternetShortcut
// check if specified flavour is present in the transferable
bool nsDataObj ::IsFlavourPresent(const char* inFlavour) {
bool retval = false;
NS_ENSURE_TRUE(mTransferable, false);
// get the list of flavors available in the transferable
nsTArray<nsCString> flavors;
nsresult rv = mTransferable->FlavorsTransferableCanExport(flavors);
NS_ENSURE_SUCCESS(rv, false);
// try to find requested flavour
for (uint32_t i = 0; i < flavors.Length(); ++i) {
if (flavors[i].Equals(inFlavour)) {
retval = true; // found it!
break;
}
} // for each flavor
return retval;
}
HRESULT nsDataObj::GetPreferredDropEffect(FORMATETC& aFE, STGMEDIUM& aSTG) {
HRESULT res = S_OK;
aSTG.tymed = TYMED_HGLOBAL;
aSTG.pUnkForRelease = nullptr;
HGLOBAL hGlobalMemory = nullptr;
hGlobalMemory = ::GlobalAlloc(GMEM_MOVEABLE, sizeof(DWORD));
if (hGlobalMemory) {
DWORD* pdw = (DWORD*)GlobalLock(hGlobalMemory);
// The PreferredDropEffect clipboard format is only registered if a
// drag/drop of an image happens from Mozilla to the desktop. We want its
// value to be DROPEFFECT_MOVE in that case so that the file is moved from
// the temporary location, not copied. This value should, ideally, be set on
// the data object via SetData() but our IDataObject implementation doesn't
// implement SetData. It adds data to the data object lazily only when the
// drop target asks for it.
*pdw = (DWORD)DROPEFFECT_MOVE;
GlobalUnlock(hGlobalMemory);
} else {
res = E_OUTOFMEMORY;
}
aSTG.hGlobal = hGlobalMemory;
return res;
}
//-----------------------------------------------------
HRESULT nsDataObj::GetText(const nsACString& aDataFlavor, FORMATETC& aFE,
STGMEDIUM& aSTG) {
void* data = nullptr;
// if someone asks for text/plain, look up text/unicode instead in the
// transferable.
const char* flavorStr;
const nsPromiseFlatCString& flat = PromiseFlatCString(aDataFlavor);
if (aDataFlavor.EqualsLiteral("text/plain"))
flavorStr = kUnicodeMime;
else
flavorStr = flat.get();
// NOTE: CreateDataFromPrimitive creates new memory, that needs to be deleted
nsCOMPtr<nsISupports> genericDataWrapper;
nsresult rv = mTransferable->GetTransferData(
flavorStr, getter_AddRefs(genericDataWrapper));
if (NS_FAILED(rv) || !genericDataWrapper) {
return E_FAIL;
}
uint32_t len;
nsPrimitiveHelpers::CreateDataFromPrimitive(nsDependentCString(flavorStr),
genericDataWrapper, &data, &len);
if (!data) return E_FAIL;
HGLOBAL hGlobalMemory = nullptr;
aSTG.tymed = TYMED_HGLOBAL;
aSTG.pUnkForRelease = nullptr;
// We play games under the hood and advertise flavors that we know we
// can support, only they require a bit of conversion or munging of the data.
// Do that here.
//
// The transferable gives us data that is null-terminated, but this isn't
// reflected in the |len| parameter. Windoze apps expect this null to be there
// so bump our data buffer by the appropriate size to account for the null
// (one char for CF_TEXT, one char16_t for CF_UNICODETEXT).
DWORD allocLen = (DWORD)len;
if (aFE.cfFormat == CF_TEXT) {
// Someone is asking for text/plain; convert the unicode (assuming it's
// present) to text with the correct platform encoding.
size_t bufferSize = sizeof(char) * (len + 2);
char* plainTextData = static_cast<char*>(moz_xmalloc(bufferSize));
char16_t* castedUnicode = reinterpret_cast<char16_t*>(data);
int32_t plainTextLen =
WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)castedUnicode, len / 2 + 1,
plainTextData, bufferSize, NULL, NULL);
// replace the unicode data with our plaintext data. Recall that
// |plainTextLen| doesn't include the null in the length.
free(data);
if (plainTextLen) {
data = plainTextData;
allocLen = plainTextLen;
} else {
free(plainTextData);
NS_WARNING("Oh no, couldn't convert unicode to plain text");
return S_OK;
}
} else if (aFE.cfFormat == nsClipboard::CF_HTML) {
// Someone is asking for win32's HTML flavor. Convert our html fragment
// from unicode to UTF-8 then put it into a format specified by msft.
NS_ConvertUTF16toUTF8 converter(reinterpret_cast<char16_t*>(data));
char* utf8HTML = nullptr;
nsresult rv =
BuildPlatformHTML(converter.get(), &utf8HTML); // null terminates
free(data);
if (NS_SUCCEEDED(rv) && utf8HTML) {
// replace the unicode data with our HTML data. Don't forget the null.
data = utf8HTML;
allocLen = strlen(utf8HTML) + sizeof(char);
} else {
NS_WARNING("Oh no, couldn't convert to HTML");
return S_OK;
}
} else if (aFE.cfFormat != nsClipboard::CF_CUSTOMTYPES) {
// we assume that any data that isn't caught above is unicode. This may
// be an erroneous assumption, but is true so far.
allocLen += sizeof(char16_t);
}
hGlobalMemory = (HGLOBAL)GlobalAlloc(GMEM_MOVEABLE, allocLen);
// Copy text to Global Memory Area
if (hGlobalMemory) {
char* dest = reinterpret_cast<char*>(GlobalLock(hGlobalMemory));
char* source = reinterpret_cast<char*>(data);
memcpy(dest, source, allocLen); // copies the null as well
GlobalUnlock(hGlobalMemory);
}
aSTG.hGlobal = hGlobalMemory;
// Now, delete the memory that was created by CreateDataFromPrimitive (or our
// text/plain data)
free(data);
return S_OK;
}
//-----------------------------------------------------
HRESULT nsDataObj::GetFile(FORMATETC& aFE, STGMEDIUM& aSTG) {
uint32_t dfInx = 0;
ULONG count;
FORMATETC fe;
m_enumFE->Reset();
while (NOERROR == m_enumFE->Next(1, &fe, &count) &&
dfInx < mDataFlavors.Length()) {
if (mDataFlavors[dfInx].EqualsLiteral(kNativeImageMime))
return DropImage(aFE, aSTG);
if (mDataFlavors[dfInx].EqualsLiteral(kFileMime))
return DropFile(aFE, aSTG);
if (mDataFlavors[dfInx].EqualsLiteral(kFilePromiseMime))
return DropTempFile(aFE, aSTG);
dfInx++;
}
return E_FAIL;
}
HRESULT nsDataObj::DropFile(FORMATETC& aFE, STGMEDIUM& aSTG) {
nsresult rv;
nsCOMPtr<nsISupports> genericDataWrapper;
if (NS_FAILED(mTransferable->GetTransferData(
kFileMime, getter_AddRefs(genericDataWrapper)))) {
return E_FAIL;
}
nsCOMPtr<nsIFile> file(do_QueryInterface(genericDataWrapper));
if (!file) return E_FAIL;
aSTG.tymed = TYMED_HGLOBAL;
aSTG.pUnkForRelease = nullptr;
nsAutoString path;
rv = file->GetPath(path);
if (NS_FAILED(rv)) return E_FAIL;
uint32_t allocLen = path.Length() + 2;
HGLOBAL hGlobalMemory = nullptr;
char16_t* dest;
hGlobalMemory = GlobalAlloc(GMEM_MOVEABLE,
sizeof(DROPFILES) + allocLen * sizeof(char16_t));
if (!hGlobalMemory) return E_FAIL;
DROPFILES* pDropFile = (DROPFILES*)GlobalLock(hGlobalMemory);
// First, populate the drop file structure
pDropFile->pFiles = sizeof(DROPFILES); // Offset to start of file name string
pDropFile->fNC = 0;
pDropFile->pt.x = 0;
pDropFile->pt.y = 0;
pDropFile->fWide = TRUE;
// Copy the filename right after the DROPFILES structure
dest = (char16_t*)(((char*)pDropFile) + pDropFile->pFiles);
memcpy(dest, path.get(), (allocLen - 1) * sizeof(char16_t));
// Two null characters are needed at the end of the file name.
// Lookup the CF_HDROP shell clipboard format for more info.
// Add the second null character right after the first one.
dest[allocLen - 1] = L'\0';
GlobalUnlock(hGlobalMemory);
aSTG.hGlobal = hGlobalMemory;
return S_OK;
}
HRESULT nsDataObj::DropImage(FORMATETC& aFE, STGMEDIUM& aSTG) {
nsresult rv;
if (!mCachedTempFile) {
nsCOMPtr<nsISupports> genericDataWrapper;
if (NS_FAILED(mTransferable->GetTransferData(
kNativeImageMime, getter_AddRefs(genericDataWrapper)))) {
return E_FAIL;
}
nsCOMPtr<imgIContainer> image(do_QueryInterface(genericDataWrapper));
if (!image) return E_FAIL;
nsCOMPtr<imgITools> imgTools =
do_CreateInstance("@mozilla.org/image/tools;1");
nsCOMPtr<nsIInputStream> inputStream;
rv = imgTools->EncodeImage(image, NS_LITERAL_CSTRING(IMAGE_BMP),
NS_LITERAL_STRING("bpp=32;version=3"),
getter_AddRefs(inputStream));
if (NS_FAILED(rv) || !inputStream) {
return E_FAIL;
}
nsCOMPtr<imgIEncoder> encoder = do_QueryInterface(inputStream);
if (!encoder) {
return E_FAIL;
}
uint32_t size = 0;
rv = encoder->GetImageBufferUsed(&size);
if (NS_FAILED(rv)) {
return E_FAIL;
}
char* src = nullptr;
rv = encoder->GetImageBuffer(&src);
if (NS_FAILED(rv) || !src) {
return E_FAIL;
}
// Save the bitmap to a temporary location.
nsCOMPtr<nsIFile> dropFile;
rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(dropFile));
if (!dropFile) {
return E_FAIL;
}
// Filename must be random so as not to confuse apps like
// Photoshop which handle multiple drags into a single window.
char buf[13];
nsCString filename;
NS_MakeRandomString(buf, 8);
memcpy(buf + 8, ".bmp", 5);
filename.Append(nsDependentCString(buf, 12));
dropFile->AppendNative(filename);
rv = dropFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0660);
if (NS_FAILED(rv)) {
return E_FAIL;
}
// Cache the temp file so we can delete it later and so
// it doesn't get recreated over and over on multiple calls
// which does occur from windows shell.
dropFile->Clone(getter_AddRefs(mCachedTempFile));
// Write the data to disk.
nsCOMPtr<nsIOutputStream> outStream;
rv = NS_NewLocalFileOutputStream(getter_AddRefs(outStream), dropFile);
if (NS_FAILED(rv)) {
return E_FAIL;
}
uint32_t written = 0;
rv = outStream->Write(src, size, &written);
if (NS_FAILED(rv) || written != size) {
return E_FAIL;
}
outStream->Close();
}
// Pass the file name back to the drop target so that it can access the file.
nsAutoString path;
rv = mCachedTempFile->GetPath(path);
if (NS_FAILED(rv)) return E_FAIL;
// Two null characters are needed to terminate the file name list.
HGLOBAL hGlobalMemory = nullptr;
uint32_t allocLen = path.Length() + 2;
aSTG.tymed = TYMED_HGLOBAL;
aSTG.pUnkForRelease = nullptr;
hGlobalMemory = GlobalAlloc(GMEM_MOVEABLE,
sizeof(DROPFILES) + allocLen * sizeof(char16_t));
if (!hGlobalMemory) return E_FAIL;
DROPFILES* pDropFile = (DROPFILES*)GlobalLock(hGlobalMemory);
// First, populate the drop file structure.
pDropFile->pFiles =
sizeof(DROPFILES); // Offset to start of file name char array.
pDropFile->fNC = 0;
pDropFile->pt.x = 0;
pDropFile->pt.y = 0;
pDropFile->fWide = TRUE;
// Copy the filename right after the DROPFILES structure.
char16_t* dest = (char16_t*)(((char*)pDropFile) + pDropFile->pFiles);
memcpy(dest, path.get(),
(allocLen - 1) *
sizeof(char16_t)); // Copies the null character in path as well.
// Two null characters are needed at the end of the file name.
// Lookup the CF_HDROP shell clipboard format for more info.
// Add the second null character right after the first one.
dest[allocLen - 1] = L'\0';
GlobalUnlock(hGlobalMemory);
aSTG.hGlobal = hGlobalMemory;
return S_OK;
}
HRESULT nsDataObj::DropTempFile(FORMATETC& aFE, STGMEDIUM& aSTG) {
nsresult rv;
if (!mCachedTempFile) {
// Tempfile will need a temporary location.
nsCOMPtr<nsIFile> dropFile;
rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(dropFile));
if (!dropFile) return E_FAIL;
// Filename must be random
nsCString filename;
nsAutoString wideFileName;
nsCOMPtr<nsIURI> sourceURI;
HRESULT res;
res = GetDownloadDetails(getter_AddRefs(sourceURI), wideFileName);
if (FAILED(res)) return res;
NS_CopyUnicodeToNative(wideFileName, filename);
dropFile->AppendNative(filename);
rv = dropFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0660);
if (NS_FAILED(rv)) return E_FAIL;
// Cache the temp file so we can delete it later and so
// it doesn't get recreated over and over on multiple calls
// which does occur from windows shell.
dropFile->Clone(getter_AddRefs(mCachedTempFile));
// Write the data to disk.
nsCOMPtr<nsIOutputStream> outStream;
rv = NS_NewLocalFileOutputStream(getter_AddRefs(outStream), dropFile);
if (NS_FAILED(rv)) return E_FAIL;
IStream* pStream = nullptr;
nsDataObj::CreateStream(&pStream);
NS_ENSURE_TRUE(pStream, E_FAIL);
char buffer[512];
ULONG readCount = 0;
uint32_t writeCount = 0;
while (1) {
HRESULT hres = pStream->Read(buffer, sizeof(buffer), &readCount);
if (FAILED(hres)) return E_FAIL;
if (readCount == 0) break;
rv = outStream->Write(buffer, readCount, &writeCount);
if (NS_FAILED(rv)) return E_FAIL;
}
outStream->Close();
pStream->Release();
}
// Pass the file name back to the drop target so that it can access the file.
nsAutoString path;
rv = mCachedTempFile->GetPath(path);
if (NS_FAILED(rv)) return E_FAIL;
uint32_t allocLen = path.Length() + 2;
// Two null characters are needed to terminate the file name list.
HGLOBAL hGlobalMemory = nullptr;
aSTG.tymed = TYMED_HGLOBAL;
aSTG.pUnkForRelease = nullptr;
hGlobalMemory = GlobalAlloc(GMEM_MOVEABLE,
sizeof(DROPFILES) + allocLen * sizeof(char16_t));
if (!hGlobalMemory) return E_FAIL;
DROPFILES* pDropFile = (DROPFILES*)GlobalLock(hGlobalMemory);
// First, populate the drop file structure.
pDropFile->pFiles =
sizeof(DROPFILES); // Offset to start of file name char array.
pDropFile->fNC = 0;
pDropFile->pt.x = 0;
pDropFile->pt.y = 0;
pDropFile->fWide = TRUE;
// Copy the filename right after the DROPFILES structure.
char16_t* dest = (char16_t*)(((char*)pDropFile) + pDropFile->pFiles);
memcpy(dest, path.get(),
(allocLen - 1) *
sizeof(char16_t)); // Copies the null character in path as well.
// Two null characters are needed at the end of the file name.
// Lookup the CF_HDROP shell clipboard format for more info.
// Add the second null character right after the first one.
dest[allocLen - 1] = L'\0';
GlobalUnlock(hGlobalMemory);
aSTG.hGlobal = hGlobalMemory;
return S_OK;
}
//-----------------------------------------------------
// Registers the DataFlavor/FE pair.
//-----------------------------------------------------
void nsDataObj::AddDataFlavor(const char* aDataFlavor, LPFORMATETC aFE) {
// These two lists are the mapping to and from data flavors and FEs.
// Later, OLE will tell us it needs a certain type of FORMATETC (text,
// unicode, etc) unicode, etc), so we will look up the data flavor that
// corresponds to the FE and then ask the transferable for that type of data.
mDataFlavors.AppendElement(aDataFlavor);
m_enumFE->AddFormatEtc(aFE);
}
//-----------------------------------------------------
// Sets the transferable object
//-----------------------------------------------------
void nsDataObj::SetTransferable(nsITransferable* aTransferable) {
NS_IF_RELEASE(mTransferable);
mTransferable = aTransferable;
if (nullptr == mTransferable) {
return;
}
NS_ADDREF(mTransferable);
return;
}
//
// ExtractURL
//
// Roots around in the transferable for the appropriate flavor that indicates
// a url and pulls out the url portion of the data. Used mostly for creating
// internet shortcuts on the desktop. The url flavor is of the format:
//
// <url> <linefeed> <page title>
//
nsresult nsDataObj ::ExtractShortcutURL(nsString& outURL) {
NS_ASSERTION(mTransferable, "We don't have a good transferable");
nsresult rv = NS_ERROR_FAILURE;
nsCOMPtr<nsISupports> genericURL;
if (NS_SUCCEEDED(mTransferable->GetTransferData(
kURLMime, getter_AddRefs(genericURL)))) {
nsCOMPtr<nsISupportsString> urlObject(do_QueryInterface(genericURL));
if (urlObject) {
nsAutoString url;
urlObject->GetData(url);
outURL = url;
// find the first linefeed in the data, that's where the url ends. trunc
// the result string at that point.
int32_t lineIndex = outURL.FindChar('\n');
NS_ASSERTION(lineIndex > 0,
"Format for url flavor is <url> <linefeed> <page title>");
if (lineIndex > 0) {
outURL.Truncate(lineIndex);
rv = NS_OK;
}
}
} else if (NS_SUCCEEDED(mTransferable->GetTransferData(
kURLDataMime, getter_AddRefs(genericURL))) ||
NS_SUCCEEDED(mTransferable->GetTransferData(
kURLPrivateMime, getter_AddRefs(genericURL)))) {
nsCOMPtr<nsISupportsString> urlObject(do_QueryInterface(genericURL));
if (urlObject) {
nsAutoString url;
urlObject->GetData(url);
outURL = url;
rv = NS_OK;
}
} // if found flavor
return rv;
} // ExtractShortcutURL
//
// ExtractShortcutTitle
//
// Roots around in the transferable for the appropriate flavor that indicates
// a url and pulls out the title portion of the data. Used mostly for creating
// internet shortcuts on the desktop. The url flavor is of the format:
//
// <url> <linefeed> <page title>
//
nsresult nsDataObj ::ExtractShortcutTitle(nsString& outTitle) {
NS_ASSERTION(mTransferable, "We'd don't have a good transferable");
nsresult rv = NS_ERROR_FAILURE;
nsCOMPtr<nsISupports> genericURL;
if (NS_SUCCEEDED(mTransferable->GetTransferData(
kURLMime, getter_AddRefs(genericURL)))) {
nsCOMPtr<nsISupportsString> urlObject(do_QueryInterface(genericURL));
if (urlObject) {
nsAutoString url;
urlObject->GetData(url);
// find the first linefeed in the data, that's where the url ends. we want
// everything after that linefeed. FindChar() returns -1 if we can't find
int32_t lineIndex = url.FindChar('\n');
NS_ASSERTION(lineIndex != -1,
"Format for url flavor is <url> <linefeed> <page title>");
if (lineIndex != -1) {
url.Mid(outTitle, lineIndex + 1, url.Length() - (lineIndex + 1));
rv = NS_OK;
}
}
} // if found flavor
return rv;
} // ExtractShortcutTitle
//
// BuildPlatformHTML
//
// Munge our HTML data to win32's CF_HTML spec. Basically, put the requisite
// header information on it. This will null terminate |outPlatformHTML|. See
// http://msdn.microsoft.com/workshop/networking/clipboard/htmlclipboard.asp
// for details.
//
// We assume that |inOurHTML| is already a fragment (ie, doesn't have <HTML>
// or <BODY> tags). We'll wrap the fragment with them to make other apps
// happy.
//
nsresult nsDataObj ::BuildPlatformHTML(const char* inOurHTML,
char** outPlatformHTML) {
*outPlatformHTML = nullptr;
nsDependentCString inHTMLString(inOurHTML);
const char* const numPlaceholder = "00000000";
const char* const startHTMLPrefix = "Version:0.9\r\nStartHTML:";
const char* const endHTMLPrefix = "\r\nEndHTML:";
const char* const startFragPrefix = "\r\nStartFragment:";
const char* const endFragPrefix = "\r\nEndFragment:";
const char* const startSourceURLPrefix = "\r\nSourceURL:";
const char* const endFragTrailer = "\r\n";
// Do we already have mSourceURL from a drag?
if (mSourceURL.IsEmpty()) {
nsAutoString url;
ExtractShortcutURL(url);
AppendUTF16toUTF8(url, mSourceURL);
}
const int32_t kSourceURLLength = mSourceURL.Length();
const int32_t kNumberLength = strlen(numPlaceholder);
const int32_t kTotalHeaderLen =
strlen(startHTMLPrefix) + strlen(endHTMLPrefix) +
strlen(startFragPrefix) + strlen(endFragPrefix) + strlen(endFragTrailer) +
(kSourceURLLength > 0 ? strlen(startSourceURLPrefix) : 0) +
kSourceURLLength + (4 * kNumberLength);
NS_NAMED_LITERAL_CSTRING(htmlHeaderString, "<html><body>\r\n");
NS_NAMED_LITERAL_CSTRING(fragmentHeaderString, "<!--StartFragment-->");
nsDependentCString trailingString(
"<!--EndFragment-->\r\n"
"</body>\r\n"
"</html>");
// calculate the offsets
int32_t startHTMLOffset = kTotalHeaderLen;
int32_t startFragOffset = startHTMLOffset + htmlHeaderString.Length() +
fragmentHeaderString.Length();
int32_t endFragOffset = startFragOffset + inHTMLString.Length();
int32_t endHTMLOffset = endFragOffset + trailingString.Length();
// now build the final version
nsCString clipboardString;
clipboardString.SetCapacity(endHTMLOffset);
clipboardString.Append(startHTMLPrefix);
clipboardString.Append(nsPrintfCString("%08u", startHTMLOffset));
clipboardString.Append(endHTMLPrefix);
clipboardString.Append(nsPrintfCString("%08u", endHTMLOffset));
clipboardString.Append(startFragPrefix);
clipboardString.Append(nsPrintfCString("%08u", startFragOffset));
clipboardString.Append(endFragPrefix);
clipboardString.Append(nsPrintfCString("%08u", endFragOffset));
if (kSourceURLLength > 0) {
clipboardString.Append(startSourceURLPrefix);
clipboardString.Append(mSourceURL);
}
clipboardString.Append(endFragTrailer);
clipboardString.Append(htmlHeaderString);
clipboardString.Append(fragmentHeaderString);
clipboardString.Append(inHTMLString);
clipboardString.Append(trailingString);
*outPlatformHTML = ToNewCString(clipboardString);
if (!*outPlatformHTML) return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
HRESULT
nsDataObj ::GetUniformResourceLocator(FORMATETC& aFE, STGMEDIUM& aSTG,
bool aIsUnicode) {
HRESULT res = S_OK;
if (IsFlavourPresent(kURLMime)) {
if (aIsUnicode)
res = ExtractUniformResourceLocatorW(aFE, aSTG);
else
res = ExtractUniformResourceLocatorA(aFE, aSTG);
} else
NS_WARNING("Not yet implemented\n");
return res;
}
HRESULT
nsDataObj::ExtractUniformResourceLocatorA(FORMATETC& aFE, STGMEDIUM& aSTG) {
HRESULT result = S_OK;
nsAutoString url;
if (NS_FAILED(ExtractShortcutURL(url))) return E_OUTOFMEMORY;
NS_LossyConvertUTF16toASCII asciiUrl(url);
const int totalLen = asciiUrl.Length() + 1;
HGLOBAL hGlobalMemory = GlobalAlloc(GMEM_ZEROINIT | GMEM_SHARE, totalLen);
if (!hGlobalMemory) return E_OUTOFMEMORY;
char* contents = reinterpret_cast<char*>(GlobalLock(hGlobalMemory));
if (!contents) {
GlobalFree(hGlobalMemory);
return E_OUTOFMEMORY;
}
strcpy(contents, asciiUrl.get());
GlobalUnlock(hGlobalMemory);
aSTG.hGlobal = hGlobalMemory;
aSTG.tymed = TYMED_HGLOBAL;
return result;
}
HRESULT
nsDataObj::ExtractUniformResourceLocatorW(FORMATETC& aFE, STGMEDIUM& aSTG) {
HRESULT result = S_OK;
nsAutoString url;
if (NS_FAILED(ExtractShortcutURL(url))) return E_OUTOFMEMORY;
const int totalLen = (url.Length() + 1) * sizeof(char16_t);
HGLOBAL hGlobalMemory = GlobalAlloc(GMEM_ZEROINIT | GMEM_SHARE, totalLen);
if (!hGlobalMemory) return E_OUTOFMEMORY;
wchar_t* contents = reinterpret_cast<wchar_t*>(GlobalLock(hGlobalMemory));
if (!contents) {
GlobalFree(hGlobalMemory);
return E_OUTOFMEMORY;
}
wcscpy(contents, url.get());
GlobalUnlock(hGlobalMemory);
aSTG.hGlobal = hGlobalMemory;
aSTG.tymed = TYMED_HGLOBAL;
return result;
}
// Gets the filename from the kFilePromiseURLMime flavour
HRESULT nsDataObj::GetDownloadDetails(nsIURI** aSourceURI,
nsAString& aFilename) {
*aSourceURI = nullptr;
NS_ENSURE_TRUE(mTransferable, E_FAIL);
// get the URI from the kFilePromiseURLMime flavor
nsCOMPtr<nsISupports> urlPrimitive;
nsresult rv = mTransferable->GetTransferData(kFilePromiseURLMime,
getter_AddRefs(urlPrimitive));
NS_ENSURE_SUCCESS(rv, E_FAIL);
nsCOMPtr<nsISupportsString> srcUrlPrimitive = do_QueryInterface(urlPrimitive);
NS_ENSURE_TRUE(srcUrlPrimitive, E_FAIL);
nsAutoString srcUri;
srcUrlPrimitive->GetData(srcUri);
if (srcUri.IsEmpty()) return E_FAIL;
nsCOMPtr<nsIURI> sourceURI;
NS_NewURI(getter_AddRefs(sourceURI), srcUri);
nsAutoString srcFileName;
nsCOMPtr<nsISupports> fileNamePrimitive;
Unused << mTransferable->GetTransferData(kFilePromiseDestFilename,
getter_AddRefs(fileNamePrimitive));
nsCOMPtr<nsISupportsString> srcFileNamePrimitive =
do_QueryInterface(fileNamePrimitive);
if (srcFileNamePrimitive) {
srcFileNamePrimitive->GetData(srcFileName);
} else {
nsCOMPtr<nsIURL> sourceURL = do_QueryInterface(sourceURI);
if (!sourceURL) return E_FAIL;
nsAutoCString urlFileName;
sourceURL->GetFileName(urlFileName);
NS_UnescapeURL(urlFileName);
CopyUTF8toUTF16(urlFileName, srcFileName);
}
if (srcFileName.IsEmpty()) return E_FAIL;
// make the name safe for the filesystem
MangleTextToValidFilename(srcFileName);
sourceURI.swap(*aSourceURI);
aFilename = srcFileName;
return S_OK;
}
HRESULT nsDataObj::GetFileDescriptor_IStreamA(FORMATETC& aFE, STGMEDIUM& aSTG) {
HGLOBAL fileGroupDescHandle =
::GlobalAlloc(GMEM_ZEROINIT | GMEM_SHARE, sizeof(FILEGROUPDESCRIPTORW));
NS_ENSURE_TRUE(fileGroupDescHandle, E_OUTOFMEMORY);
LPFILEGROUPDESCRIPTORA fileGroupDescA =
reinterpret_cast<LPFILEGROUPDESCRIPTORA>(GlobalLock(fileGroupDescHandle));
if (!fileGroupDescA) {
::GlobalFree(fileGroupDescHandle);
return E_OUTOFMEMORY;
}
nsAutoString wideFileName;
HRESULT res;
nsCOMPtr<nsIURI> sourceURI;
res = GetDownloadDetails(getter_AddRefs(sourceURI), wideFileName);
if (FAILED(res)) {
::GlobalFree(fileGroupDescHandle);
return res;
}
nsAutoCString nativeFileName;
NS_CopyUnicodeToNative(wideFileName, nativeFileName);
strncpy(fileGroupDescA->fgd[0].cFileName, nativeFileName.get(),
NS_MAX_FILEDESCRIPTOR - 1);
fileGroupDescA->fgd[0].cFileName[NS_MAX_FILEDESCRIPTOR - 1] = '\0';
// one file in the file block
fileGroupDescA->cItems = 1;
fileGroupDescA->fgd[0].dwFlags = FD_PROGRESSUI;
GlobalUnlock(fileGroupDescHandle);
aSTG.hGlobal = fileGroupDescHandle;
aSTG.tymed = TYMED_HGLOBAL;
return S_OK;
}
HRESULT nsDataObj::GetFileDescriptor_IStreamW(FORMATETC& aFE, STGMEDIUM& aSTG) {
HGLOBAL fileGroupDescHandle =
::GlobalAlloc(GMEM_ZEROINIT | GMEM_SHARE, sizeof(FILEGROUPDESCRIPTORW));
NS_ENSURE_TRUE(fileGroupDescHandle, E_OUTOFMEMORY);
LPFILEGROUPDESCRIPTORW fileGroupDescW =
reinterpret_cast<LPFILEGROUPDESCRIPTORW>(GlobalLock(fileGroupDescHandle));
if (!fileGroupDescW) {
::GlobalFree(fileGroupDescHandle);
return E_OUTOFMEMORY;
}
nsAutoString wideFileName;
HRESULT res;
nsCOMPtr<nsIURI> sourceURI;
res = GetDownloadDetails(getter_AddRefs(sourceURI), wideFileName);
if (FAILED(res)) {
::GlobalFree(fileGroupDescHandle);
return res;
}
wcsncpy(fileGroupDescW->fgd[0].cFileName, wideFileName.get(),
NS_MAX_FILEDESCRIPTOR - 1);
fileGroupDescW->fgd[0].cFileName[NS_MAX_FILEDESCRIPTOR - 1] = '\0';
// one file in the file block
fileGroupDescW->cItems = 1;
fileGroupDescW->fgd[0].dwFlags = FD_PROGRESSUI;
GlobalUnlock(fileGroupDescHandle);
aSTG.hGlobal = fileGroupDescHandle;
aSTG.tymed = TYMED_HGLOBAL;
return S_OK;
}
HRESULT nsDataObj::GetFileContents_IStream(FORMATETC& aFE, STGMEDIUM& aSTG) {
IStream* pStream = nullptr;
nsDataObj::CreateStream(&pStream);
NS_ENSURE_TRUE(pStream, E_FAIL);
aSTG.tymed = TYMED_ISTREAM;
aSTG.pstm = pStream;
aSTG.pUnkForRelease = nullptr;
return S_OK;
}
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