1 files changed, 129 insertions, 0 deletions
diff --git a/netwerk/base/nsInputStreamPump.h b/netwerk/base/nsInputStreamPump.h
new file mode 100644
index 0000000000..21e75c0276
--- /dev/null
+++ b/netwerk/base/nsInputStreamPump.h
@@ -0,0 +1,129 @@
+/* -*- Mode: C++; tab-width: 2; 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 nsInputStreamPump_h__
+#define nsInputStreamPump_h__
+
+#include "nsIInputStreamPump.h"
+#include "nsIAsyncInputStream.h"
+#include "nsIThreadRetargetableRequest.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/RecursiveMutex.h"
+
+#ifdef DEBUG
+#  include "MainThreadUtils.h"
+#  include "nsISerialEventTarget.h"
+#endif
+
+class nsIInputStream;
+class nsILoadGroup;
+class nsIStreamListener;
+
+#define NS_INPUT_STREAM_PUMP_IID                     \
+  {                                                  \
+    0x42f1cc9b, 0xdf5f, 0x4c9b, {                    \
+      0xbd, 0x71, 0x8d, 0x4a, 0xe2, 0x27, 0xc1, 0x8a \
+    }                                                \
+  }
+
+class nsInputStreamPump final : public nsIInputStreamPump,
+                                public nsIInputStreamCallback,
+                                public nsIThreadRetargetableRequest {
+  ~nsInputStreamPump() = default;
+
+ public:
+  using RecursiveMutexAutoLock = mozilla::RecursiveMutexAutoLock;
+  using RecursiveMutexAutoUnlock = mozilla::RecursiveMutexAutoUnlock;
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIREQUEST
+  NS_DECL_NSIINPUTSTREAMPUMP
+  NS_DECL_NSIINPUTSTREAMCALLBACK
+  NS_DECL_NSITHREADRETARGETABLEREQUEST
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_INPUT_STREAM_PUMP_IID)
+
+  nsInputStreamPump();
+
+  static nsresult Create(nsInputStreamPump** result, nsIInputStream* stream,
+                         uint32_t segsize = 0, uint32_t segcount = 0,
+                         bool closeWhenDone = false,
+                         nsISerialEventTarget* mainThreadTarget = nullptr);
+
+  using PeekSegmentFun = void (*)(void*, const uint8_t*, uint32_t);
+  /**
+   * Peek into the first chunk of data that's in the stream. Note that this
+   * method will not call the callback when there is no data in the stream.
+   * The callback will be called at most once.
+   *
+   * The data from the stream will not be consumed, i.e. the pump's listener
+   * can still read all the data
+   *
+   * Do not call before asyncRead. Do not call after onStopRequest.
+   */
+  nsresult PeekStream(PeekSegmentFun callback, void* closure);
+
+  /**
+   * Dispatched (to the main thread) by OnStateStop if it's called off main
+   * thread. Updates mState based on return value of OnStateStop.
+   */
+  nsresult CallOnStateStop();
+
+ protected:
+  enum { STATE_IDLE, STATE_START, STATE_TRANSFER, STATE_STOP, STATE_DEAD };
+
+  nsresult EnsureWaiting();
+  uint32_t OnStateStart();
+  uint32_t OnStateTransfer();
+  uint32_t OnStateStop();
+  nsresult CreateBufferedStreamIfNeeded() MOZ_REQUIRES(mMutex);
+
+  // This should optimize away in non-DEBUG builds
+  MOZ_ALWAYS_INLINE void AssertOnThread() const MOZ_REQUIRES(mMutex) {
+    if (mOffMainThread) {
+      MOZ_ASSERT(mTargetThread->IsOnCurrentThread());
+    } else {
+      MOZ_ASSERT(NS_IsMainThread());
+    }
+  }
+
+  uint32_t mState MOZ_GUARDED_BY(mMutex){STATE_IDLE};
+  nsCOMPtr<nsILoadGroup> mLoadGroup MOZ_GUARDED_BY(mMutex);
+  // mListener is written on a single thread (either MainThread or an
+  // off-MainThread thread), read from that thread and perhaps others (in
+  // RetargetDeliveryTo)
+  nsCOMPtr<nsIStreamListener> mListener MOZ_GUARDED_BY(mMutex);
+  nsCOMPtr<nsISerialEventTarget> mTargetThread MOZ_GUARDED_BY(mMutex);
+  nsCOMPtr<nsISerialEventTarget> mLabeledMainThreadTarget
+      MOZ_GUARDED_BY(mMutex);
+  nsCOMPtr<nsIInputStream> mStream MOZ_GUARDED_BY(mMutex);
+  // mAsyncStream is written on a single thread (either MainThread or an
+  // off-MainThread thread), and lives from AsyncRead() to OnStateStop().
+  nsCOMPtr<nsIAsyncInputStream> mAsyncStream MOZ_GUARDED_BY(mMutex);
+  uint64_t mStreamOffset MOZ_GUARDED_BY(mMutex){0};
+  uint64_t mStreamLength MOZ_GUARDED_BY(mMutex){0};
+  uint32_t mSegSize MOZ_GUARDED_BY(mMutex){0};
+  uint32_t mSegCount MOZ_GUARDED_BY(mMutex){0};
+  nsresult mStatus MOZ_GUARDED_BY(mMutex){NS_OK};
+  uint32_t mSuspendCount MOZ_GUARDED_BY(mMutex){0};
+  uint32_t mLoadFlags MOZ_GUARDED_BY(mMutex){LOAD_NORMAL};
+  bool mIsPending MOZ_GUARDED_BY(mMutex){false};
+  // True while in OnInputStreamReady, calling OnStateStart, OnStateTransfer
+  // and OnStateStop. Used to prevent calls to AsyncWait during callbacks.
+  bool mProcessingCallbacks MOZ_GUARDED_BY(mMutex){false};
+  // True if waiting on the "input stream ready" callback.
+  bool mWaitingForInputStreamReady MOZ_GUARDED_BY(mMutex){false};
+  bool mCloseWhenDone MOZ_GUARDED_BY(mMutex){false};
+  bool mRetargeting MOZ_GUARDED_BY(mMutex){false};
+  bool mAsyncStreamIsBuffered MOZ_GUARDED_BY(mMutex){false};
+  // Indicate whether nsInputStreamPump is used completely off main thread.
+  // If true, OnStateStop() is executed off main thread. Set at creation.
+  const bool mOffMainThread;
+  // Protects state/member var accesses across multiple threads.
+  mozilla::RecursiveMutex mMutex{"nsInputStreamPump"};
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsInputStreamPump, NS_INPUT_STREAM_PUMP_IID)
+
+#endif  // !nsInputStreamChannel_h__