summaryrefslogtreecommitdiffstats
path: root/dom/base/MutableBlobStorage.h
diff options
context:
space:
mode:
Diffstat (limited to 'dom/base/MutableBlobStorage.h')
-rw-r--r--dom/base/MutableBlobStorage.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/dom/base/MutableBlobStorage.h b/dom/base/MutableBlobStorage.h
new file mode 100644
index 000000000..fad391b16
--- /dev/null
+++ b/dom/base/MutableBlobStorage.h
@@ -0,0 +1,107 @@
+/* -*- 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_MutableBlobStorage_h
+#define mozilla_dom_MutableBlobStorage_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