forked from mirrors/gecko-dev
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TemporaryFileBlobImpl.h"
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#include "RemoteLazyInputStreamThread.h"
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#include "nsFileStreams.h"
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#include "nsIFile.h"
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#include "nsIFileStreams.h"
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#include "nsNetUtil.h"
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#include "nsThreadUtils.h"
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#include "nsXULAppAPI.h"
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using namespace mozilla::ipc;
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namespace mozilla {
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namespace dom {
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namespace {
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// Here the flags needed in order to keep the temporary file opened.
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// 1. REOPEN_ON_REWIND -> otherwise the stream is not serializable more than
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// once.
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// 2. no DEFER_OPEN -> the file must be kept open on windows in order to be
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// deleted when used.
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// 3. no CLOSE_ON_EOF -> the file will be closed by the DTOR. No needs. Also
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// because the inputStream will not be read directly.
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// 4. no SHARE_DELETE -> We don't want to allow this file to be deleted.
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const uint32_t sTemporaryFileStreamFlags = nsIFileInputStream::REOPEN_ON_REWIND;
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class TemporaryFileInputStream final : public nsFileInputStream {
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public:
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static nsresult Create(nsIFile* aFile, nsIInputStream** aInputStream) {
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MOZ_ASSERT(aFile);
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MOZ_ASSERT(aInputStream);
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MOZ_ASSERT(XRE_IsParentProcess());
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RefPtr<TemporaryFileInputStream> stream =
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new TemporaryFileInputStream(aFile);
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nsresult rv = stream->Init(aFile, -1, -1, sTemporaryFileStreamFlags);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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stream.forget(aInputStream);
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return NS_OK;
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}
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void Serialize(InputStreamParams& aParams,
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FileDescriptorArray& aFileDescriptors, bool aDelayedStart,
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uint32_t aMaxSize, uint32_t* aSizeUsed,
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ParentToChildStreamActorManager* aManager) override {
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MOZ_CRASH("This inputStream cannot be serialized.");
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}
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void Serialize(InputStreamParams& aParams,
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FileDescriptorArray& aFileDescriptors, bool aDelayedStart,
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uint32_t aMaxSize, uint32_t* aSizeUsed,
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ChildToParentStreamActorManager* aManager) override {
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MOZ_CRASH("This inputStream cannot be serialized.");
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}
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bool Deserialize(const InputStreamParams& aParams,
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const FileDescriptorArray& aFileDescriptors) override {
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MOZ_CRASH("This inputStream cannot be deserialized.");
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return false;
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}
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private:
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explicit TemporaryFileInputStream(nsIFile* aFile) : mFile(aFile) {
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MOZ_ASSERT(XRE_IsParentProcess());
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}
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~TemporaryFileInputStream() {
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// Let's delete the file on the RemoteLazyInputStream Thread.
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RefPtr<RemoteLazyInputStreamThread> thread =
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RemoteLazyInputStreamThread::GetOrCreate();
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if (NS_WARN_IF(!thread)) {
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return;
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}
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nsCOMPtr<nsIFile> file = std::move(mFile);
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thread->Dispatch(
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NS_NewRunnableFunction("TemporaryFileInputStream::Runnable",
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[file]() { file->Remove(false); }));
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}
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nsCOMPtr<nsIFile> mFile;
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};
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} // namespace
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TemporaryFileBlobImpl::TemporaryFileBlobImpl(nsIFile* aFile,
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const nsAString& aContentType)
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: FileBlobImpl(aFile, EmptyString(), aContentType)
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#ifdef DEBUG
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,
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mInputStreamCreated(false)
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#endif
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{
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MOZ_ASSERT(XRE_IsParentProcess());
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// This must be considered a blob.
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mIsFile = false;
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}
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TemporaryFileBlobImpl::~TemporaryFileBlobImpl() {
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MOZ_ASSERT(mInputStreamCreated);
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}
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already_AddRefed<BlobImpl> TemporaryFileBlobImpl::CreateSlice(
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uint64_t aStart, uint64_t aLength, const nsAString& aContentType,
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ErrorResult& aRv) {
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MOZ_CRASH("This BlobImpl is not meant to be sliced!");
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return nullptr;
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}
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void TemporaryFileBlobImpl::CreateInputStream(nsIInputStream** aStream,
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ErrorResult& aRv) {
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#ifdef DEBUG
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MOZ_ASSERT(!mInputStreamCreated);
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// CreateInputStream can be called only once.
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mInputStreamCreated = true;
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#endif
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aRv = TemporaryFileInputStream::Create(mFile, aStream);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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}
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} // namespace dom
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} // namespace mozilla
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