gecko-dev/dom/file/FileBlobImpl.cpp

269 lines
6.6 KiB
C++

/* -*- 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FileBlobImpl.h"
#include "mozilla/SlicedInputStream.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "nsCExternalHandlerService.h"
#include "nsIFile.h"
#include "nsIFileStreams.h"
#include "nsIMIMEService.h"
#include "nsNetUtil.h"
#include "nsStreamUtils.h"
namespace mozilla {
namespace dom {
FileBlobImpl::FileBlobImpl(nsIFile* aFile)
: BaseBlobImpl(EmptyString(), EmptyString(), UINT64_MAX, INT64_MAX)
, mFile(aFile)
, mWholeFile(true)
, mFileId(-1)
{
MOZ_ASSERT(mFile, "must have file");
MOZ_ASSERT(XRE_IsParentProcess());
// Lazily get the content type and size
mContentType.SetIsVoid(true);
mFile->GetLeafName(mName);
}
FileBlobImpl::FileBlobImpl(const nsAString& aName,
const nsAString& aContentType,
uint64_t aLength, nsIFile* aFile)
: BaseBlobImpl(aName, aContentType, aLength, UINT64_MAX)
, mFile(aFile)
, mWholeFile(true)
, mFileId(-1)
{
MOZ_ASSERT(mFile, "must have file");
MOZ_ASSERT(XRE_IsParentProcess());
}
FileBlobImpl::FileBlobImpl(const nsAString& aName,
const nsAString& aContentType,
uint64_t aLength, nsIFile* aFile,
int64_t aLastModificationDate)
: BaseBlobImpl(aName, aContentType, aLength, aLastModificationDate)
, mFile(aFile)
, mWholeFile(true)
, mFileId(-1)
{
MOZ_ASSERT(mFile, "must have file");
MOZ_ASSERT(XRE_IsParentProcess());
}
FileBlobImpl::FileBlobImpl(nsIFile* aFile, const nsAString& aName,
const nsAString& aContentType)
: BaseBlobImpl(aName, aContentType, UINT64_MAX, INT64_MAX)
, mFile(aFile)
, mWholeFile(true)
, mFileId(-1)
{
MOZ_ASSERT(mFile, "must have file");
MOZ_ASSERT(XRE_IsParentProcess());
if (aContentType.IsEmpty()) {
// Lazily get the content type and size
mContentType.SetIsVoid(true);
}
}
FileBlobImpl::FileBlobImpl(const FileBlobImpl* aOther, uint64_t aStart,
uint64_t aLength, const nsAString& aContentType)
: BaseBlobImpl(aContentType, aOther->mStart + aStart, aLength)
, mFile(aOther->mFile)
, mWholeFile(false)
, mFileId(-1)
{
MOZ_ASSERT(mFile, "must have file");
MOZ_ASSERT(XRE_IsParentProcess());
mImmutable = aOther->mImmutable;
}
already_AddRefed<BlobImpl>
FileBlobImpl::CreateSlice(uint64_t aStart, uint64_t aLength,
const nsAString& aContentType,
ErrorResult& aRv)
{
RefPtr<BlobImpl> impl =
new FileBlobImpl(this, aStart, aLength, aContentType);
return impl.forget();
}
void
FileBlobImpl::GetMozFullPathInternal(nsAString& aFilename,
ErrorResult& aRv) const
{
MOZ_ASSERT(mIsFile, "Should only be called on files");
aRv = mFile->GetPath(aFilename);
}
uint64_t
FileBlobImpl::GetSize(ErrorResult& aRv)
{
if (BaseBlobImpl::IsSizeUnknown()) {
MOZ_ASSERT(mWholeFile,
"Should only use lazy size when using the whole file");
int64_t fileSize;
aRv = mFile->GetFileSize(&fileSize);
if (NS_WARN_IF(aRv.Failed())) {
return 0;
}
if (fileSize < 0) {
aRv.Throw(NS_ERROR_FAILURE);
return 0;
}
mLength = fileSize;
}
return mLength;
}
namespace {
class GetTypeRunnable final : public WorkerMainThreadRunnable
{
public:
GetTypeRunnable(WorkerPrivate* aWorkerPrivate,
BlobImpl* aBlobImpl)
: WorkerMainThreadRunnable(aWorkerPrivate,
NS_LITERAL_CSTRING("FileBlobImpl :: GetType"))
, mBlobImpl(aBlobImpl)
{
MOZ_ASSERT(aBlobImpl);
aWorkerPrivate->AssertIsOnWorkerThread();
}
bool
MainThreadRun() override
{
MOZ_ASSERT(NS_IsMainThread());
nsAutoString type;
mBlobImpl->GetType(type);
return true;
}
private:
~GetTypeRunnable() = default;
RefPtr<BlobImpl> mBlobImpl;
};
} // anonymous namespace
void
FileBlobImpl::GetType(nsAString& aType)
{
aType.Truncate();
if (mContentType.IsVoid()) {
MOZ_ASSERT(mWholeFile,
"Should only use lazy ContentType when using the whole file");
if (!NS_IsMainThread()) {
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
if (!workerPrivate) {
// I have no idea in which thread this method is called. We cannot
// return any valid value.
return;
}
RefPtr<GetTypeRunnable> runnable =
new GetTypeRunnable(workerPrivate, this);
ErrorResult rv;
runnable->Dispatch(Canceling, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
}
return;
}
nsresult rv;
nsCOMPtr<nsIMIMEService> mimeService =
do_GetService(NS_MIMESERVICE_CONTRACTID, &rv);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
nsAutoCString mimeType;
rv = mimeService->GetTypeFromFile(mFile, mimeType);
if (NS_FAILED(rv)) {
mimeType.Truncate();
}
AppendUTF8toUTF16(mimeType, mContentType);
mContentType.SetIsVoid(false);
}
aType = mContentType;
}
int64_t
FileBlobImpl::GetLastModified(ErrorResult& aRv)
{
MOZ_ASSERT(mIsFile, "Should only be called on files");
if (BaseBlobImpl::IsDateUnknown()) {
PRTime msecs;
aRv = mFile->GetLastModifiedTime(&msecs);
if (NS_WARN_IF(aRv.Failed())) {
return 0;
}
mLastModificationDate = msecs;
}
return mLastModificationDate;
}
void
FileBlobImpl::SetLastModified(int64_t aLastModified)
{
MOZ_CRASH("SetLastModified of a real file is not allowed!");
}
const uint32_t sFileStreamFlags =
nsIFileInputStream::CLOSE_ON_EOF |
nsIFileInputStream::REOPEN_ON_REWIND |
nsIFileInputStream::DEFER_OPEN |
nsIFileInputStream::SHARE_DELETE;
void
FileBlobImpl::CreateInputStream(nsIInputStream** aStream, ErrorResult& aRv)
{
nsCOMPtr<nsIInputStream> stream;
aRv = NS_NewLocalFileInputStream(getter_AddRefs(stream), mFile, -1, -1,
sFileStreamFlags);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
if (mWholeFile) {
stream.forget(aStream);
return;
}
RefPtr<SlicedInputStream> slicedInputStream =
new SlicedInputStream(stream.forget(), mStart, mLength);
slicedInputStream.forget(aStream);
}
bool
FileBlobImpl::IsDirectory() const
{
bool isDirectory = false;
if (mFile) {
mFile->IsDirectory(&isDirectory);
}
return isDirectory;
}
} // namespace dom
} // namespace mozilla