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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_BlobURLInputStream_h
#define mozilla_dom_BlobURLInputStream_h
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/Mutex.h"
#include "nsCOMPtr.h"
#include "nsIAsyncInputStream.h"
#include "nsIInputStreamLength.h"
namespace mozilla::dom {
class BlobURL;
class BlobURLChannel;
class BlobURLInputStream final : public nsIAsyncInputStream,
public nsIInputStreamLength,
public nsIAsyncInputStreamLength,
public nsIInputStreamCallback,
public nsIInputStreamLengthCallback {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIASYNCINPUTSTREAM
NS_DECL_NSIINPUTSTREAMLENGTH
NS_DECL_NSIASYNCINPUTSTREAMLENGTH
NS_DECL_NSIINPUTSTREAMCALLBACK
NS_DECL_NSIINPUTSTREAMLENGTHCALLBACK
static already_AddRefed<nsIInputStream> Create(BlobURLChannel* const aChannel,
BlobURL* const aBlobURL);
BlobURLInputStream(BlobURLChannel* const aChannel, nsACString& aBlobURLSpec);
private:
enum class State { INITIAL, READY, WAITING, CLOSED, ERROR };
~BlobURLInputStream();
void WaitOnUnderlyingStream(const MutexAutoLock& aProofOfLock);
// This method should only be used to call RetrieveBlobData in a different
// thread
void CallRetrieveBlobData();
void RetrieveBlobData(const MutexAutoLock& aProofOfLock);
nsresult StoreBlobImplStream(already_AddRefed<BlobImpl> aBlobImpl,
const MutexAutoLock& aProofOfLock);
void NotifyWaitTargets(const MutexAutoLock& aProofOfLock);
void ReleaseUnderlyingStream(const MutexAutoLock& aProofOfLock);
RefPtr<BlobURLChannel> mChannel;
const nsCString mBlobURLSpec;
// Non-recursive mutex introduced in order to guard access to mState, mError
// and mAsyncInputStream
Mutex mStateMachineMutex MOZ_UNANNOTATED;
State mState;
// Stores the error code if stream is in error state
nsresult mError;
int64_t mBlobSize;
nsCOMPtr<nsIAsyncInputStream> mAsyncInputStream;
nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback;
nsCOMPtr<nsIEventTarget> mAsyncWaitTarget;
uint32_t mAsyncWaitFlags;
uint32_t mAsyncWaitRequestedCount;
nsCOMPtr<nsIInputStreamLengthCallback> mAsyncLengthWaitCallback;
nsCOMPtr<nsIEventTarget> mAsyncLengthWaitTarget;
};
} // namespace mozilla::dom
#endif /* mozilla_dom_BlobURLInputStream_h */
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