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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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_MutableBlobStorage_h
#define mozilla_dom_MutableBlobStorage_h
#include "nsCycleCollectionParticipant.h"
#include "nsThreadUtils.h"
#include "nsProxyRelease.h"
#include "mozilla/RefPtr.h"
#include "prio.h"
namespace mozilla {
class TaskQueue;
namespace dom {
class Blob;
class BlobImpl;
class MutableBlobStorage;
class MutableBlobStorageCallback
{
public:
NS_IMETHOD_(MozExternalRefCountType) AddRef(void) = 0;
NS_IMETHOD_(MozExternalRefCountType) Release(void) = 0;
virtual void BlobStoreCompleted(MutableBlobStorage* aBlobStorage,
Blob* aBlob,
nsresult aRv) = 0;
};
// This class is main-thread only.
class MutableBlobStorage final
{
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MutableBlobStorage);
enum MutableBlobStorageType
{
eOnlyInMemory,
eCouldBeInTemporaryFile,
};
explicit MutableBlobStorage(MutableBlobStorageType aType);
nsresult Append(const void* aData, uint32_t aLength);
// This method can be called just once.
// The callback will be called when the Blob is ready.
// The return value is the total size of the blob, when created.
uint64_t GetBlobWhenReady(nsISupports* aParent,
const nsACString& aContentType,
MutableBlobStorageCallback* aCallback);
void TemporaryFileCreated(PRFileDesc* aFD);
void CreateBlobAndRespond(already_AddRefed<nsISupports> aParent,
const nsACString& aContentType,
already_AddRefed<MutableBlobStorageCallback> aCallback);
void ErrorPropagated(nsresult aRv);
private:
~MutableBlobStorage();
bool ExpandBufferSize(uint64_t aSize);
bool ShouldBeTemporaryStorage(uint64_t aSize) const;
nsresult MaybeCreateTemporaryFile();
void DispatchToIOThread(already_AddRefed<nsIRunnable> aRunnable);
// All these variables are touched on the main thread only.
void* mData;
uint64_t mDataLen;
uint64_t mDataBufferLen;
enum StorageState {
eKeepInMemory,
eInMemory,
eWaitingForTemporaryFile,
eInTemporaryFile,
eClosed
};
StorageState mStorageState;
PRFileDesc* mFD;
nsresult mErrorResult;
RefPtr<TaskQueue> mTaskQueue;
nsCOMPtr<nsISupports> mPendingParent;
nsCString mPendingContentType;
RefPtr<MutableBlobStorageCallback> mPendingCallback;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_MutableBlobStorage_h
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