import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

netwerk/cache2/CacheFileInputStream.h

@@ -0,0 +1,79 @@
+/* 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 CacheFileInputStream__h__
+#define CacheFileInputStream__h__
+
+#include "nsIAsyncInputStream.h"
+#include "nsISeekableStream.h"
+#include "nsCOMPtr.h"
+#include "nsAutoPtr.h"
+#include "CacheFileChunk.h"
+
+namespace mozilla {
+namespace net {
+
+class CacheFile;
+
+class CacheFileInputStream : public nsIAsyncInputStream
+                           , public nsISeekableStream
+                           , public CacheFileChunkListener
+{
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIINPUTSTREAM
+  NS_DECL_NSIASYNCINPUTSTREAM
+  NS_DECL_NSISEEKABLESTREAM
+
+public:
+  explicit CacheFileInputStream(CacheFile *aFile, nsISupports *aEntry,
+                                bool aAlternativeData);
+
+  NS_IMETHOD OnChunkRead(nsresult aResult, CacheFileChunk *aChunk) override;
+  NS_IMETHOD OnChunkWritten(nsresult aResult, CacheFileChunk *aChunk) override;
+  NS_IMETHOD OnChunkAvailable(nsresult aResult, uint32_t aChunkIdx,
+                              CacheFileChunk *aChunk) override;
+  NS_IMETHOD OnChunkUpdated(CacheFileChunk *aChunk) override;
+
+  // Memory reporting
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+
+  uint32_t GetPosition() const { return mPos; };
+  bool IsAlternativeData() const { return mAlternativeData; };
+
+private:
+  virtual ~CacheFileInputStream();
+
+  nsresult CloseWithStatusLocked(nsresult aStatus);
+  void CleanUp();
+  void ReleaseChunk();
+  void EnsureCorrectChunk(bool aReleaseOnly);
+
+  // CanRead returns negative value when output stream truncates the data before
+  // the input stream's mPos.
+  int64_t CanRead(CacheFileChunkReadHandle *aHandle);
+  void NotifyListener();
+  void MaybeNotifyListener();
+
+  RefPtr<CacheFile>      mFile;
+  RefPtr<CacheFileChunk> mChunk;
+  int64_t                mPos;
+  nsresult               mStatus;
+  bool                   mClosed : 1;
+  bool                   mInReadSegments : 1;
+  bool                   mWaitingForUpdate : 1;
+  bool const             mAlternativeData : 1;
+  int64_t                mListeningForChunk;
+
+  nsCOMPtr<nsIInputStreamCallback> mCallback;
+  uint32_t                         mCallbackFlags;
+  nsCOMPtr<nsIEventTarget>         mCallbackTarget;
+  // Held purely for referencing purposes
+  RefPtr<nsISupports>              mCacheEntryHandle;
+};
+
+
+} // namespace net
+} // namespace mozilla
+
+#endif