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FileStreamWrappers.cpp
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FileStreamWrappers.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=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 "FileStreamWrappers.h"
#include "nsIFileStorage.h"
#include "nsISeekableStream.h"
#include "mozilla/Attributes.h"
#include "FileHelper.h"
USING_FILE_NAMESPACE
namespace {
class ProgressRunnable MOZ_FINAL : public nsIRunnable
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIRUNNABLE
ProgressRunnable(FileHelper* aFileHelper,
uint64_t aProgress,
uint64_t aProgressMax)
: mFileHelper(aFileHelper),
mProgress(aProgress),
mProgressMax(aProgressMax)
{
}
private:
nsRefPtr<FileHelper> mFileHelper;
uint64_t mProgress;
uint64_t mProgressMax;
};
class CloseRunnable MOZ_FINAL : public nsIRunnable
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIRUNNABLE
CloseRunnable(FileHelper* aFileHelper)
: mFileHelper(aFileHelper)
{ }
private:
nsRefPtr<FileHelper> mFileHelper;
};
class DestroyRunnable MOZ_FINAL : public nsIRunnable
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIRUNNABLE
DestroyRunnable(FileHelper* aFileHelper)
: mFileHelper(aFileHelper)
{ }
private:
nsRefPtr<FileHelper> mFileHelper;
};
} // anonymous namespace
FileStreamWrapper::FileStreamWrapper(nsISupports* aFileStream,
FileHelper* aFileHelper,
uint64_t aOffset,
uint64_t aLimit,
uint32_t aFlags)
: mFileStream(aFileStream),
mFileHelper(aFileHelper),
mOffset(aOffset),
mLimit(aLimit),
mFlags(aFlags),
mFirstTime(true)
{
NS_ASSERTION(mFileStream, "Must have a file stream!");
NS_ASSERTION(mFileHelper, "Must have a file helper!");
}
FileStreamWrapper::~FileStreamWrapper()
{
if (mFlags & NOTIFY_DESTROY) {
if (NS_IsMainThread()) {
mFileHelper->OnStreamDestroy();
}
else {
nsCOMPtr<nsIRunnable> runnable =
new DestroyRunnable(mFileHelper);
nsresult rv = NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch to the main thread!");
}
}
}
}
NS_IMPL_ISUPPORTS0(FileStreamWrapper)
FileInputStreamWrapper::FileInputStreamWrapper(nsISupports* aFileStream,
FileHelper* aFileHelper,
uint64_t aOffset,
uint64_t aLimit,
uint32_t aFlags)
: FileStreamWrapper(aFileStream, aFileHelper, aOffset, aLimit, aFlags)
{
mInputStream = do_QueryInterface(mFileStream);
NS_ASSERTION(mInputStream, "This should always succeed!");
}
NS_IMPL_ISUPPORTS_INHERITED1(FileInputStreamWrapper,
FileStreamWrapper,
nsIInputStream)
NS_IMETHODIMP
FileInputStreamWrapper::Close()
{
NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
if (mFlags & NOTIFY_CLOSE) {
nsCOMPtr<nsIRunnable> runnable = new CloseRunnable(mFileHelper);
if (NS_FAILED(NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL))) {
NS_WARNING("Failed to dispatch to the main thread!");
}
}
mOffset = 0;
mLimit = 0;
return NS_OK;
}
NS_IMETHODIMP
FileInputStreamWrapper::Available(uint64_t* _retval)
{
// Performing sync IO on the main thread is generally not allowed.
// However, the input stream wrapper is also used to track reads performed by
// other APIs like FileReader, XHR, etc.
// In that case nsInputStreamChannel::OpenContentStream() calls Available()
// before setting the content length property. This property is not important
// to perform reads properly, so we can just return NS_BASE_STREAM_CLOSED
// here. It causes OpenContentStream() to set the content length property to
// zero.
if (NS_IsMainThread()) {
return NS_BASE_STREAM_CLOSED;
}
return mInputStream->Available(_retval);
}
NS_IMETHODIMP
FileInputStreamWrapper::Read(char* aBuf, uint32_t aCount, uint32_t* _retval)
{
NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
nsresult rv;
if (mFirstTime) {
mFirstTime = false;
if (mOffset != UINT64_MAX) {
nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mInputStream);
if (seekable) {
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, mOffset);
NS_ENSURE_SUCCESS(rv, rv);
}
}
mOffset = 0;
}
uint64_t max = mLimit - mOffset;
if (max == 0) {
*_retval = 0;
return NS_OK;
}
if (aCount > max) {
aCount = max;
}
rv = mInputStream->Read(aBuf, aCount, _retval);
NS_ENSURE_SUCCESS(rv, rv);
mOffset += *_retval;
if (mFlags & NOTIFY_PROGRESS) {
nsCOMPtr<nsIRunnable> runnable =
new ProgressRunnable(mFileHelper, mOffset, mLimit);
rv = NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch to the main thread!");
}
}
return NS_OK;
}
NS_IMETHODIMP
FileInputStreamWrapper::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
uint32_t aCount, uint32_t* _retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
FileInputStreamWrapper::IsNonBlocking(bool* _retval)
{
*_retval = false;
return NS_OK;
}
FileOutputStreamWrapper::FileOutputStreamWrapper(nsISupports* aFileStream,
FileHelper* aFileHelper,
uint64_t aOffset,
uint64_t aLimit,
uint32_t aFlags)
: FileStreamWrapper(aFileStream, aFileHelper, aOffset, aLimit, aFlags)
#ifdef DEBUG
, mWriteThread(nullptr)
#endif
{
mOutputStream = do_QueryInterface(mFileStream);
NS_ASSERTION(mOutputStream, "This should always succeed!");
}
NS_IMPL_ISUPPORTS_INHERITED1(FileOutputStreamWrapper,
FileStreamWrapper,
nsIOutputStream)
NS_IMETHODIMP
FileOutputStreamWrapper::Close()
{
NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
nsresult rv = NS_OK;
if (!mFirstTime) {
NS_ASSERTION(PR_GetCurrentThread() == mWriteThread,
"Unsetting thread locals on wrong thread!");
mFileHelper->mFileStorage->UnsetThreadLocals();
}
if (mFlags & NOTIFY_CLOSE) {
nsCOMPtr<nsIRunnable> runnable = new CloseRunnable(mFileHelper);
if (NS_FAILED(NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL))) {
NS_WARNING("Failed to dispatch to the main thread!");
}
}
mOffset = 0;
mLimit = 0;
return rv;
}
NS_IMETHODIMP
FileOutputStreamWrapper::Write(const char* aBuf, uint32_t aCount,
uint32_t* _retval)
{
NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
nsresult rv;
if (mFirstTime) {
mFirstTime = false;
#ifdef DEBUG
mWriteThread = PR_GetCurrentThread();
#endif
mFileHelper->mFileStorage->SetThreadLocals();
nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mOutputStream);
if (seekable) {
if (mOffset == UINT64_MAX) {
rv = seekable->Seek(nsISeekableStream::NS_SEEK_END, 0);
}
else {
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, mOffset);
}
NS_ENSURE_SUCCESS(rv, rv);
}
mOffset = 0;
}
uint64_t max = mLimit - mOffset;
if (max == 0) {
*_retval = 0;
return NS_OK;
}
if (aCount > max) {
aCount = max;
}
rv = mOutputStream->Write(aBuf, aCount, _retval);
NS_ENSURE_SUCCESS(rv, rv);
mOffset += *_retval;
if (mFlags & NOTIFY_PROGRESS) {
nsCOMPtr<nsIRunnable> runnable =
new ProgressRunnable(mFileHelper, mOffset, mLimit);
NS_DispatchToMainThread(runnable, NS_DISPATCH_NORMAL);
}
return NS_OK;
}
NS_IMETHODIMP
FileOutputStreamWrapper::Flush()
{
return NS_OK;
}
NS_IMETHODIMP
FileOutputStreamWrapper::WriteFrom(nsIInputStream* aFromStream,
uint32_t aCount, uint32_t* _retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
FileOutputStreamWrapper::WriteSegments(nsReadSegmentFun aReader,
void* aClosure, uint32_t aCount,
uint32_t* _retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
FileOutputStreamWrapper::IsNonBlocking(bool* _retval)
{
*_retval = false;
return NS_OK;
}
NS_IMPL_ISUPPORTS1(ProgressRunnable, nsIRunnable)
NS_IMETHODIMP
ProgressRunnable::Run()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mFileHelper->OnStreamProgress(mProgress, mProgressMax);
mFileHelper = nullptr;
return NS_OK;
}
NS_IMPL_ISUPPORTS1(CloseRunnable, nsIRunnable)
NS_IMETHODIMP
CloseRunnable::Run()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mFileHelper->OnStreamClose();
mFileHelper = nullptr;
return NS_OK;
}
NS_IMPL_ISUPPORTS1(DestroyRunnable, nsIRunnable)
NS_IMETHODIMP
DestroyRunnable::Run()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mFileHelper->OnStreamDestroy();
mFileHelper = nullptr;
return NS_OK;
}