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