Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 174 insertions, 0 deletions

diff --git a/dom/file/MemoryBlobImpl.h b/dom/file/MemoryBlobImpl.h
new file mode 100644
index 0000000000..dfe5ae2e65
--- /dev/null
+++ b/dom/file/MemoryBlobImpl.h
@@ -0,0 +1,174 @@
+/* -*- 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_MemoryBlobImpl_h
+#define mozilla_dom_MemoryBlobImpl_h
+
+#include "mozilla/dom/BaseBlobImpl.h"
+#include "mozilla/LinkedList.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "nsCOMPtr.h"
+#include "nsICloneableInputStream.h"
+#include "nsIInputStream.h"
+#include "nsIIPCSerializableInputStream.h"
+#include "nsISeekableStream.h"
+
+namespace mozilla {
+namespace dom {
+
+class MemoryBlobImpl final : public BaseBlobImpl {
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(MemoryBlobImpl, BaseBlobImpl)
+
+  // File constructor.
+  static already_AddRefed<MemoryBlobImpl> CreateWithLastModifiedNow(
+      void* aMemoryBuffer, uint64_t aLength, const nsAString& aName,
+      const nsAString& aContentType, bool aCrossOriginIsolated);
+
+  // File constructor with custom lastModified attribue value. You should
+  // probably use CreateWithLastModifiedNow() instead of this one.
+  static already_AddRefed<MemoryBlobImpl> CreateWithCustomLastModified(
+      void* aMemoryBuffer, uint64_t aLength, const nsAString& aName,
+      const nsAString& aContentType, int64_t aLastModifiedDate);
+
+  // Blob constructor.
+  MemoryBlobImpl(void* aMemoryBuffer, uint64_t aLength,
+                 const nsAString& aContentType)
+      : BaseBlobImpl(aContentType, aLength),
+        mDataOwner(new DataOwner(aMemoryBuffer, aLength)) {
+    MOZ_ASSERT(mDataOwner && mDataOwner->mData, "must have data");
+  }
+
+  void CreateInputStream(nsIInputStream** aStream, ErrorResult& aRv) override;
+
+  already_AddRefed<BlobImpl> CreateSlice(uint64_t aStart, uint64_t aLength,
+                                         const nsAString& aContentType,
+                                         ErrorResult& aRv) override;
+
+  bool IsMemoryFile() const override { return true; }
+
+  size_t GetAllocationSize() const override { return mLength; }
+
+  size_t GetAllocationSize(
+      FallibleTArray<BlobImpl*>& aVisitedBlobImpls) const override {
+    return GetAllocationSize();
+  }
+
+  void GetBlobImplType(nsAString& aBlobImplType) const override {
+    aBlobImplType = u"MemoryBlobImpl"_ns;
+  }
+
+  class DataOwner final : public mozilla::LinkedListElement<DataOwner> {
+   public:
+    NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DataOwner)
+    DataOwner(void* aMemoryBuffer, uint64_t aLength)
+        : mData(aMemoryBuffer), mLength(aLength) {
+      mozilla::StaticMutexAutoLock lock(sDataOwnerMutex);
+
+      if (!sDataOwners) {
+        sDataOwners = new mozilla::LinkedList<DataOwner>();
+        EnsureMemoryReporterRegistered();
+      }
+      sDataOwners->insertBack(this);
+    }
+
+   private:
+    // Private destructor, to discourage deletion outside of Release():
+    ~DataOwner() {
+      mozilla::StaticMutexAutoLock lock(sDataOwnerMutex);
+
+      remove();
+      if (sDataOwners->isEmpty()) {
+        // Free the linked list if it's empty.
+        sDataOwners = nullptr;
+      }
+
+      free(mData);
+    }
+
+   public:
+    static void EnsureMemoryReporterRegistered();
+
+    // sDataOwners and sMemoryReporterRegistered may only be accessed while
+    // holding sDataOwnerMutex!  You also must hold the mutex while touching
+    // elements of the linked list that DataOwner inherits from.
+    static mozilla::StaticMutex sDataOwnerMutex;
+    static mozilla::StaticAutoPtr<mozilla::LinkedList<DataOwner> > sDataOwners;
+    static bool sMemoryReporterRegistered;
+
+    void* mData;
+    uint64_t mLength;
+  };
+
+  class DataOwnerAdapter final : public nsIInputStream,
+                                 public nsISeekableStream,
+                                 public nsIIPCSerializableInputStream,
+                                 public nsICloneableInputStream {
+    typedef MemoryBlobImpl::DataOwner DataOwner;
+
+   public:
+    static nsresult Create(DataOwner* aDataOwner, uint32_t aStart,
+                           uint32_t aLength, nsIInputStream** _retval);
+
+    NS_DECL_THREADSAFE_ISUPPORTS
+
+    // These are mandatory.
+    NS_FORWARD_NSIINPUTSTREAM(mStream->)
+    NS_FORWARD_NSISEEKABLESTREAM(mSeekableStream->)
+    NS_FORWARD_NSITELLABLESTREAM(mSeekableStream->)
+    NS_FORWARD_NSICLONEABLEINPUTSTREAM(mCloneableInputStream->)
+
+    // This is optional. We use a conditional QI to keep it from being called
+    // if the underlying stream doesn't support it.
+    NS_FORWARD_NSIIPCSERIALIZABLEINPUTSTREAM(mSerializableInputStream->)
+
+   private:
+    ~DataOwnerAdapter() = default;
+
+    DataOwnerAdapter(DataOwner* aDataOwner, nsIInputStream* aStream)
+        : mDataOwner(aDataOwner),
+          mStream(aStream),
+          mSeekableStream(do_QueryInterface(aStream)),
+          mSerializableInputStream(do_QueryInterface(aStream)),
+          mCloneableInputStream(do_QueryInterface(aStream)) {
+      MOZ_ASSERT(mSeekableStream, "Somebody gave us the wrong stream!");
+    }
+
+    RefPtr<DataOwner> mDataOwner;
+    nsCOMPtr<nsIInputStream> mStream;
+    nsCOMPtr<nsISeekableStream> mSeekableStream;
+    nsCOMPtr<nsIIPCSerializableInputStream> mSerializableInputStream;
+    nsCOMPtr<nsICloneableInputStream> mCloneableInputStream;
+  };
+
+ private:
+  // File constructor.
+  MemoryBlobImpl(void* aMemoryBuffer, uint64_t aLength, const nsAString& aName,
+                 const nsAString& aContentType, int64_t aLastModifiedDate)
+      : BaseBlobImpl(aName, aContentType, aLength, aLastModifiedDate),
+        mDataOwner(new DataOwner(aMemoryBuffer, aLength)) {
+    MOZ_ASSERT(mDataOwner && mDataOwner->mData, "must have data");
+  }
+
+  // Create slice
+  MemoryBlobImpl(const MemoryBlobImpl* aOther, uint64_t aStart,
+                 uint64_t aLength, const nsAString& aContentType)
+      : BaseBlobImpl(aContentType, aOther->mStart + aStart, aLength),
+        mDataOwner(aOther->mDataOwner) {
+    MOZ_ASSERT(mDataOwner && mDataOwner->mData, "must have data");
+  }
+
+  ~MemoryBlobImpl() = default;
+
+  // Used when backed by a memory store
+  RefPtr<DataOwner> mDataOwner;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_MemoryBlobImpl_h