Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 786 insertions, 0 deletions

diff --git a/netwerk/base/nsInputStreamPump.cpp b/netwerk/base/nsInputStreamPump.cpp
new file mode 100644
index 0000000000..11aac4cd9b
--- /dev/null
+++ b/netwerk/base/nsInputStreamPump.cpp
@@ -0,0 +1,786 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=4 sts=2 sw=2 et cin: */
+/* 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/. */
+
+#include "nsIOService.h"
+#include "nsInputStreamPump.h"
+#include "nsIStreamTransportService.h"
+#include "nsIThreadRetargetableStreamListener.h"
+#include "nsThreadUtils.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Logging.h"
+#include "mozilla/NonBlockingAsyncInputStream.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/SlicedInputStream.h"
+#include "nsIStreamListener.h"
+#include "nsILoadGroup.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsStreamUtils.h"
+#include <algorithm>
+
+//
+// MOZ_LOG=nsStreamPump:5
+//
+static mozilla::LazyLogModule gStreamPumpLog("nsStreamPump");
+#undef LOG
+#define LOG(args) MOZ_LOG(gStreamPumpLog, mozilla::LogLevel::Debug, args)
+
+//-----------------------------------------------------------------------------
+// nsInputStreamPump methods
+//-----------------------------------------------------------------------------
+
+nsInputStreamPump::nsInputStreamPump() : mOffMainThread(!NS_IsMainThread()) {}
+
+nsresult nsInputStreamPump::Create(nsInputStreamPump** result,
+                                   nsIInputStream* stream, uint32_t segsize,
+                                   uint32_t segcount, bool closeWhenDone,
+                                   nsISerialEventTarget* mainThreadTarget) {
+  nsresult rv = NS_ERROR_OUT_OF_MEMORY;
+  RefPtr<nsInputStreamPump> pump = new nsInputStreamPump();
+  if (pump) {
+    rv = pump->Init(stream, segsize, segcount, closeWhenDone, mainThreadTarget);
+    if (NS_SUCCEEDED(rv)) {
+      pump.forget(result);
+    }
+  }
+  return rv;
+}
+
+struct PeekData {
+  PeekData(nsInputStreamPump::PeekSegmentFun fun, void* closure)
+      : mFunc(fun), mClosure(closure) {}
+
+  nsInputStreamPump::PeekSegmentFun mFunc;
+  void* mClosure;
+};
+
+static nsresult CallPeekFunc(nsIInputStream* aInStream, void* aClosure,
+                             const char* aFromSegment, uint32_t aToOffset,
+                             uint32_t aCount, uint32_t* aWriteCount) {
+  NS_ASSERTION(aToOffset == 0, "Called more than once?");
+  NS_ASSERTION(aCount > 0, "Called without data?");
+
+  PeekData* data = static_cast<PeekData*>(aClosure);
+  data->mFunc(data->mClosure, reinterpret_cast<const uint8_t*>(aFromSegment),
+              aCount);
+  return NS_BINDING_ABORTED;
+}
+
+nsresult nsInputStreamPump::PeekStream(PeekSegmentFun callback, void* closure) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  MOZ_ASSERT(mAsyncStream, "PeekStream called without stream");
+
+  nsresult rv = CreateBufferedStreamIfNeeded();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // See if the pipe is closed by checking the return of Available.
+  uint64_t dummy64;
+  rv = mAsyncStream->Available(&dummy64);
+  if (NS_FAILED(rv)) return rv;
+  uint32_t dummy = (uint32_t)std::min(dummy64, (uint64_t)UINT32_MAX);
+
+  PeekData data(callback, closure);
+  return mAsyncStream->ReadSegments(
+      CallPeekFunc, &data, mozilla::net::nsIOService::gDefaultSegmentSize,
+      &dummy);
+}
+
+nsresult nsInputStreamPump::EnsureWaiting() {
+  mMutex.AssertCurrentThreadIn();
+
+  // no need to worry about multiple threads... an input stream pump lives
+  // on only one thread at a time.
+  MOZ_ASSERT(mAsyncStream);
+  if (!mWaitingForInputStreamReady && !mProcessingCallbacks) {
+    // Ensure OnStateStop is called on the main thread only when this pump is
+    // created on main thread.
+    if (mState == STATE_STOP && !mOffMainThread) {
+      nsCOMPtr<nsISerialEventTarget> mainThread =
+          mLabeledMainThreadTarget
+              ? mLabeledMainThreadTarget
+              : do_AddRef(mozilla::GetMainThreadSerialEventTarget());
+      if (mTargetThread != mainThread) {
+        mTargetThread = mainThread;
+      }
+    }
+    MOZ_ASSERT(mTargetThread);
+    nsresult rv = mAsyncStream->AsyncWait(this, 0, 0, mTargetThread);
+    if (NS_FAILED(rv)) {
+      NS_ERROR("AsyncWait failed");
+      return rv;
+    }
+    // Any retargeting during STATE_START or START_TRANSFER is complete
+    // after the call to AsyncWait; next callback will be on mTargetThread.
+    mRetargeting = false;
+    mWaitingForInputStreamReady = true;
+  }
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsInputStreamPump::nsISupports
+//-----------------------------------------------------------------------------
+
+// although this class can only be accessed from one thread at a time, we do
+// allow its ownership to move from thread to thread, assuming the consumer
+// understands the limitations of this.
+NS_IMPL_ADDREF(nsInputStreamPump)
+NS_IMPL_RELEASE(nsInputStreamPump)
+NS_INTERFACE_MAP_BEGIN(nsInputStreamPump)
+  NS_INTERFACE_MAP_ENTRY(nsIRequest)
+  NS_INTERFACE_MAP_ENTRY(nsIThreadRetargetableRequest)
+  NS_INTERFACE_MAP_ENTRY(nsIInputStreamCallback)
+  NS_INTERFACE_MAP_ENTRY(nsIInputStreamPump)
+  NS_INTERFACE_MAP_ENTRY_CONCRETE(nsInputStreamPump)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInputStreamPump)
+NS_INTERFACE_MAP_END
+
+//-----------------------------------------------------------------------------
+// nsInputStreamPump::nsIRequest
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsInputStreamPump::GetName(nsACString& result) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  result.Truncate();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::IsPending(bool* result) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  *result = (mState != STATE_IDLE && mState != STATE_DEAD);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::GetStatus(nsresult* status) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  *status = mStatus;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsInputStreamPump::SetCanceledReason(const nsACString& aReason) {
+  return SetCanceledReasonImpl(aReason);
+}
+
+NS_IMETHODIMP nsInputStreamPump::GetCanceledReason(nsACString& aReason) {
+  return GetCanceledReasonImpl(aReason);
+}
+
+NS_IMETHODIMP nsInputStreamPump::CancelWithReason(nsresult aStatus,
+                                                  const nsACString& aReason) {
+  return CancelWithReasonImpl(aStatus, aReason);
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::Cancel(nsresult status) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  AssertOnThread();
+
+  LOG(("nsInputStreamPump::Cancel [this=%p status=%" PRIx32 "]\n", this,
+       static_cast<uint32_t>(status)));
+
+  if (NS_FAILED(mStatus)) {
+    LOG(("  already canceled\n"));
+    return NS_OK;
+  }
+
+  NS_ASSERTION(NS_FAILED(status), "cancel with non-failure status code");
+  mStatus = status;
+
+  // close input stream
+  if (mAsyncStream) {
+    // If mSuspendCount != 0, EnsureWaiting will be called by Resume().
+    // Note that while suspended, OnInputStreamReady will
+    // not do anything, and also note that calling asyncWait
+    // on a closed stream works and will dispatch an event immediately.
+
+    nsCOMPtr<nsIEventTarget> currentTarget = NS_GetCurrentThread();
+    if (mTargetThread && currentTarget != mTargetThread) {
+      nsresult rv = mTargetThread->Dispatch(NS_NewRunnableFunction(
+          "nsInputStreamPump::Cancel", [self = RefPtr{this}, status] {
+            RecursiveMutexAutoLock lock(self->mMutex);
+            if (!self->mAsyncStream) {
+              return;
+            }
+            self->mAsyncStream->CloseWithStatus(status);
+            if (self->mSuspendCount == 0) {
+              self->EnsureWaiting();
+            }
+          }));
+      NS_ENSURE_SUCCESS(rv, rv);
+    } else {
+      mAsyncStream->CloseWithStatus(status);
+      if (mSuspendCount == 0) {
+        EnsureWaiting();
+      }
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::Suspend() {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  LOG(("nsInputStreamPump::Suspend [this=%p]\n", this));
+  NS_ENSURE_TRUE(mState != STATE_IDLE && mState != STATE_DEAD,
+                 NS_ERROR_UNEXPECTED);
+  ++mSuspendCount;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::Resume() {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  LOG(("nsInputStreamPump::Resume [this=%p]\n", this));
+  NS_ENSURE_TRUE(mSuspendCount > 0, NS_ERROR_UNEXPECTED);
+  NS_ENSURE_TRUE(mState != STATE_IDLE && mState != STATE_DEAD,
+                 NS_ERROR_UNEXPECTED);
+
+  // There is a brief in-between state when we null out mAsyncStream in
+  // OnStateStop() before calling OnStopRequest, and only afterwards set
+  // STATE_DEAD, which we need to handle gracefully.
+  if (--mSuspendCount == 0 && mAsyncStream) {
+    EnsureWaiting();
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::GetLoadFlags(nsLoadFlags* aLoadFlags) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  *aLoadFlags = mLoadFlags;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::SetLoadFlags(nsLoadFlags aLoadFlags) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  mLoadFlags = aLoadFlags;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::GetTRRMode(nsIRequest::TRRMode* aTRRMode) {
+  return GetTRRModeImpl(aTRRMode);
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::SetTRRMode(nsIRequest::TRRMode aTRRMode) {
+  return SetTRRModeImpl(aTRRMode);
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::GetLoadGroup(nsILoadGroup** aLoadGroup) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  *aLoadGroup = do_AddRef(mLoadGroup).take();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::SetLoadGroup(nsILoadGroup* aLoadGroup) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  mLoadGroup = aLoadGroup;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsInputStreamPump::nsIInputStreamPump implementation
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsInputStreamPump::Init(nsIInputStream* stream, uint32_t segsize,
+                        uint32_t segcount, bool closeWhenDone,
+                        nsISerialEventTarget* mainThreadTarget) {
+  // probably we can't be multithread-accessed yet
+  RecursiveMutexAutoLock lock(mMutex);
+  NS_ENSURE_TRUE(mState == STATE_IDLE, NS_ERROR_IN_PROGRESS);
+
+  mStream = stream;
+  mSegSize = segsize;
+  mSegCount = segcount;
+  mCloseWhenDone = closeWhenDone;
+  mLabeledMainThreadTarget = mainThreadTarget;
+  if (mOffMainThread && mLabeledMainThreadTarget) {
+    MOZ_ASSERT(
+        false,
+        "Init stream pump off main thread with a main thread event target.");
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::AsyncRead(nsIStreamListener* listener) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  // This ensures only one thread can interact with a pump at a time
+  NS_ENSURE_TRUE(mState == STATE_IDLE, NS_ERROR_IN_PROGRESS);
+  NS_ENSURE_ARG_POINTER(listener);
+  MOZ_ASSERT(NS_IsMainThread() || mOffMainThread,
+             "nsInputStreamPump should be read from the "
+             "main thread only.");
+
+  nsresult rv = NS_MakeAsyncNonBlockingInputStream(
+      mStream.forget(), getter_AddRefs(mAsyncStream), mCloseWhenDone, mSegSize,
+      mSegCount);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  MOZ_ASSERT(mAsyncStream);
+
+  // mStreamOffset now holds the number of bytes currently read.
+  mStreamOffset = 0;
+
+  // grab event queue (we must do this here by contract, since all notifications
+  // must go to the thread which called AsyncRead)
+  if (NS_IsMainThread() && mLabeledMainThreadTarget) {
+    mTargetThread = mLabeledMainThreadTarget;
+  } else {
+    mTargetThread = mozilla::GetCurrentSerialEventTarget();
+  }
+  NS_ENSURE_STATE(mTargetThread);
+
+  rv = EnsureWaiting();
+  if (NS_FAILED(rv)) return rv;
+
+  if (mLoadGroup) mLoadGroup->AddRequest(this, nullptr);
+
+  mState = STATE_START;
+  mListener = listener;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsInputStreamPump::nsIInputStreamCallback implementation
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream* stream) {
+  LOG(("nsInputStreamPump::OnInputStreamReady [this=%p]\n", this));
+
+  AUTO_PROFILER_LABEL("nsInputStreamPump::OnInputStreamReady", NETWORK);
+
+  // this function has been called from a PLEvent, so we can safely call
+  // any listener or progress sink methods directly from here.
+
+  for (;;) {
+    // There should only be one iteration of this loop happening at a time.
+    // To prevent AsyncWait() (called during callbacks or on other threads)
+    // from creating a parallel OnInputStreamReady(), we use:
+    // -- a mutex; and
+    // -- a boolean mProcessingCallbacks to detect parallel loops
+    //    when exiting the mutex for callbacks.
+    RecursiveMutexAutoLock lock(mMutex);
+
+    // Prevent parallel execution during callbacks, while out of mutex.
+    if (mProcessingCallbacks) {
+      MOZ_ASSERT(!mProcessingCallbacks);
+      break;
+    }
+    mProcessingCallbacks = true;
+    if (mSuspendCount || mState == STATE_IDLE || mState == STATE_DEAD) {
+      mWaitingForInputStreamReady = false;
+      mProcessingCallbacks = false;
+      break;
+    }
+
+    uint32_t nextState;
+    switch (mState) {
+      case STATE_START:
+        nextState = OnStateStart();
+        break;
+      case STATE_TRANSFER:
+        nextState = OnStateTransfer();
+        break;
+      case STATE_STOP:
+        mRetargeting = false;
+        nextState = OnStateStop();
+        break;
+      default:
+        nextState = 0;
+        MOZ_ASSERT_UNREACHABLE("Unknown enum value.");
+        return NS_ERROR_UNEXPECTED;
+    }
+
+    bool stillTransferring =
+        (mState == STATE_TRANSFER && nextState == STATE_TRANSFER);
+    if (stillTransferring) {
+      NS_ASSERTION(NS_SUCCEEDED(mStatus),
+                   "Should not have failed status for ongoing transfer");
+    } else {
+      NS_ASSERTION(mState != nextState,
+                   "Only OnStateTransfer can be called more than once.");
+    }
+    if (mRetargeting) {
+      NS_ASSERTION(mState != STATE_STOP,
+                   "Retargeting should not happen during OnStateStop.");
+    }
+
+    // Set mRetargeting so EnsureWaiting will be called. It ensures that
+    // OnStateStop is called on the main thread.
+    if (nextState == STATE_STOP && !NS_IsMainThread() && !mOffMainThread) {
+      mRetargeting = true;
+    }
+
+    // Unset mProcessingCallbacks here (while we have lock) so our own call to
+    // EnsureWaiting isn't blocked by it.
+    mProcessingCallbacks = false;
+
+    // We must break the loop if suspended during one of the previous
+    // operation.
+    if (mSuspendCount) {
+      mState = nextState;
+      mWaitingForInputStreamReady = false;
+      break;
+    }
+
+    // Wait asynchronously if there is still data to transfer, or we're
+    // switching event delivery to another thread.
+    if (stillTransferring || mRetargeting) {
+      mState = nextState;
+      mWaitingForInputStreamReady = false;
+      nsresult rv = EnsureWaiting();
+      if (NS_SUCCEEDED(rv)) break;
+
+      // Failure to start asynchronous wait: stop transfer.
+      // Do not set mStatus if it was previously set to report a failure.
+      if (NS_SUCCEEDED(mStatus)) {
+        mStatus = rv;
+      }
+      nextState = STATE_STOP;
+    }
+
+    mState = nextState;
+  }
+  return NS_OK;
+}
+
+uint32_t nsInputStreamPump::OnStateStart() {
+  mMutex.AssertCurrentThreadIn();
+
+  AUTO_PROFILER_LABEL("nsInputStreamPump::OnStateStart", NETWORK);
+
+  LOG(("  OnStateStart [this=%p]\n", this));
+
+  nsresult rv;
+
+  // need to check the reason why the stream is ready.  this is required
+  // so our listener can check our status from OnStartRequest.
+  // XXX async streams should have a GetStatus method!
+  if (NS_SUCCEEDED(mStatus)) {
+    uint64_t avail;
+    rv = mAsyncStream->Available(&avail);
+    if (NS_FAILED(rv) && rv != NS_BASE_STREAM_CLOSED) mStatus = rv;
+  }
+
+  {
+    nsCOMPtr<nsIStreamListener> listener = mListener;
+    // We're on the writing thread
+    AssertOnThread();
+
+    // Note: Must exit mutex for call to OnStartRequest to avoid
+    // deadlocks when calls to RetargetDeliveryTo for multiple
+    // nsInputStreamPumps are needed (e.g. nsHttpChannel).
+    RecursiveMutexAutoUnlock unlock(mMutex);
+    rv = listener->OnStartRequest(this);
+  }
+
+  // an error returned from OnStartRequest should cause us to abort; however,
+  // we must not stomp on mStatus if already canceled.
+  if (NS_FAILED(rv) && NS_SUCCEEDED(mStatus)) mStatus = rv;
+
+  return NS_SUCCEEDED(mStatus) ? STATE_TRANSFER : STATE_STOP;
+}
+
+uint32_t nsInputStreamPump::OnStateTransfer() {
+  mMutex.AssertCurrentThreadIn();
+
+  AUTO_PROFILER_LABEL("nsInputStreamPump::OnStateTransfer", NETWORK);
+
+  LOG(("  OnStateTransfer [this=%p]\n", this));
+
+  // if canceled, go directly to STATE_STOP...
+  if (NS_FAILED(mStatus)) return STATE_STOP;
+
+  nsresult rv = CreateBufferedStreamIfNeeded();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return STATE_STOP;
+  }
+
+  uint64_t avail;
+  rv = mAsyncStream->Available(&avail);
+  LOG(("  Available returned [stream=%p rv=%" PRIx32 " avail=%" PRIu64 "]\n",
+       mAsyncStream.get(), static_cast<uint32_t>(rv), avail));
+
+  if (rv == NS_BASE_STREAM_CLOSED) {
+    rv = NS_OK;
+    avail = 0;
+  } else if (NS_SUCCEEDED(rv) && avail) {
+    // we used to limit avail to 16K - we were afraid some ODA handlers
+    // might assume they wouldn't get more than 16K at once
+    // we're removing that limit since it speeds up local file access.
+    // Now there's an implicit 64K limit of 4 16K segments
+    // NOTE: ok, so the story is as follows.  OnDataAvailable impls
+    //       are by contract supposed to consume exactly |avail| bytes.
+    //       however, many do not... mailnews... stream converters...
+    //       cough, cough.  the input stream pump is fairly tolerant
+    //       in this regard; however, if an ODA does not consume any
+    //       data from the stream, then we could potentially end up in
+    //       an infinite loop.  we do our best here to try to catch
+    //       such an error.  (see bug 189672)
+
+    // in most cases this QI will succeed (mAsyncStream is almost always
+    // a nsPipeInputStream, which implements nsITellableStream::Tell).
+    int64_t offsetBefore;
+    nsCOMPtr<nsITellableStream> tellable = do_QueryInterface(mAsyncStream);
+    if (tellable && NS_FAILED(tellable->Tell(&offsetBefore))) {
+      MOZ_ASSERT_UNREACHABLE("Tell failed on readable stream");
+      offsetBefore = 0;
+    }
+
+    uint32_t odaAvail = avail > UINT32_MAX ? UINT32_MAX : uint32_t(avail);
+
+    LOG(("  calling OnDataAvailable [offset=%" PRIu64 " count=%" PRIu64
+         "(%u)]\n",
+         mStreamOffset, avail, odaAvail));
+
+    {
+      // We may be called on non-MainThread even if mOffMainThread is
+      // false, due to RetargetDeliveryTo(), so don't use AssertOnThread()
+      if (mTargetThread) {
+        MOZ_ASSERT(mTargetThread->IsOnCurrentThread());
+      } else {
+        MOZ_ASSERT(NS_IsMainThread());
+      }
+
+      nsCOMPtr<nsIStreamListener> listener = mListener;
+      // Note: Must exit mutex for call to OnStartRequest to avoid
+      // deadlocks when calls to RetargetDeliveryTo for multiple
+      // nsInputStreamPumps are needed (e.g. nsHttpChannel).
+      RecursiveMutexAutoUnlock unlock(mMutex);
+      // We're on the writing thread for mListener and mAsyncStream.
+      // mStreamOffset is only touched in OnStateTransfer, and AsyncRead
+      // shouldn't be called during OnDataAvailable()
+
+      MOZ_PUSH_IGNORE_THREAD_SAFETY
+      rv = listener->OnDataAvailable(this, mAsyncStream, mStreamOffset,
+                                     odaAvail);
+      MOZ_POP_THREAD_SAFETY
+    }
+
+    // don't enter this code if ODA failed or called Cancel
+    if (NS_SUCCEEDED(rv) && NS_SUCCEEDED(mStatus)) {
+      // test to see if this ODA failed to consume data
+      if (tellable) {
+        // NOTE: if Tell fails, which can happen if the stream is
+        // now closed, then we assume that everything was read.
+        int64_t offsetAfter;
+        if (NS_FAILED(tellable->Tell(&offsetAfter))) {
+          offsetAfter = offsetBefore + odaAvail;
+        }
+        if (offsetAfter > offsetBefore) {
+          mStreamOffset += (offsetAfter - offsetBefore);
+        } else if (mSuspendCount == 0) {
+          //
+          // possible infinite loop if we continue pumping data!
+          //
+          // NOTE: although not allowed by nsIStreamListener, we
+          // will allow the ODA impl to Suspend the pump.  IMAP
+          // does this :-(
+          //
+          NS_ERROR("OnDataAvailable implementation consumed no data");
+          mStatus = NS_ERROR_UNEXPECTED;
+        }
+      } else {
+        mStreamOffset += odaAvail;  // assume ODA behaved well
+      }
+    }
+  }
+
+  // an error returned from Available or OnDataAvailable should cause us to
+  // abort; however, we must not stop on mStatus if already canceled.
+
+  if (NS_SUCCEEDED(mStatus)) {
+    if (NS_FAILED(rv)) {
+      mStatus = rv;
+    } else if (avail) {
+      // if stream is now closed, advance to STATE_STOP right away.
+      // Available may return 0 bytes available at the moment; that
+      // would not mean that we are done.
+      // XXX async streams should have a GetStatus method!
+      rv = mAsyncStream->Available(&avail);
+      if (NS_SUCCEEDED(rv)) return STATE_TRANSFER;
+      if (rv != NS_BASE_STREAM_CLOSED) mStatus = rv;
+    }
+  }
+  return STATE_STOP;
+}
+
+nsresult nsInputStreamPump::CallOnStateStop() {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  MOZ_ASSERT(NS_IsMainThread(),
+             "CallOnStateStop should only be called on the main thread.");
+
+  mState = OnStateStop();
+  return NS_OK;
+}
+
+uint32_t nsInputStreamPump::OnStateStop() {
+  mMutex.AssertCurrentThreadIn();
+
+  if (!NS_IsMainThread() && !mOffMainThread) {
+    // This method can be called on a different thread if nsInputStreamPump
+    // is used off the main-thread.
+    nsresult rv = mLabeledMainThreadTarget->Dispatch(
+        mozilla::NewRunnableMethod("nsInputStreamPump::CallOnStateStop", this,
+                                   &nsInputStreamPump::CallOnStateStop));
+    NS_ENSURE_SUCCESS(rv, STATE_DEAD);
+    return STATE_DEAD;
+  }
+
+  AUTO_PROFILER_LABEL("nsInputStreamPump::OnStateStop", NETWORK);
+
+  LOG(("  OnStateStop [this=%p status=%" PRIx32 "]\n", this,
+       static_cast<uint32_t>(mStatus)));
+
+  // if an error occurred, we must be sure to pass the error onto the async
+  // stream.  in some cases, this is redundant, but since close is idempotent,
+  // this is OK.  otherwise, be sure to honor the "close-when-done" option.
+
+  if (!mAsyncStream || !mListener) {
+    MOZ_ASSERT(mAsyncStream, "null mAsyncStream: OnStateStop called twice?");
+    MOZ_ASSERT(mListener, "null mListener: OnStateStop called twice?");
+    return STATE_DEAD;
+  }
+
+  if (NS_FAILED(mStatus)) {
+    mAsyncStream->CloseWithStatus(mStatus);
+  } else if (mCloseWhenDone) {
+    mAsyncStream->Close();
+  }
+
+  mAsyncStream = nullptr;
+  mIsPending = false;
+  {
+    // We're on the writing thread.
+    // We believe that mStatus can't be changed on us here.
+    AssertOnThread();
+
+    nsCOMPtr<nsIStreamListener> listener = mListener;
+    nsresult status = mStatus;
+    // Note: Must exit mutex for call to OnStartRequest to avoid
+    // deadlocks when calls to RetargetDeliveryTo for multiple
+    // nsInputStreamPumps are needed (e.g. nsHttpChannel).
+    RecursiveMutexAutoUnlock unlock(mMutex);
+
+    listener->OnStopRequest(this, status);
+  }
+  mTargetThread = nullptr;
+  mListener = nullptr;
+
+  if (mLoadGroup) mLoadGroup->RemoveRequest(this, nullptr, mStatus);
+
+  return STATE_DEAD;
+}
+
+nsresult nsInputStreamPump::CreateBufferedStreamIfNeeded() {
+  if (mAsyncStreamIsBuffered) {
+    return NS_OK;
+  }
+
+  // ReadSegments is not available for any nsIAsyncInputStream. In order to use
+  // it, we wrap a nsIBufferedInputStream around it, if needed.
+
+  if (NS_InputStreamIsBuffered(mAsyncStream)) {
+    mAsyncStreamIsBuffered = true;
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIInputStream> stream;
+  nsresult rv = NS_NewBufferedInputStream(getter_AddRefs(stream),
+                                          mAsyncStream.forget(), 4096);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // A buffered inputStream must implement nsIAsyncInputStream.
+  mAsyncStream = do_QueryInterface(stream);
+  MOZ_DIAGNOSTIC_ASSERT(mAsyncStream);
+  mAsyncStreamIsBuffered = true;
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsIThreadRetargetableRequest
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsInputStreamPump::RetargetDeliveryTo(nsISerialEventTarget* aNewTarget) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  NS_ENSURE_ARG(aNewTarget);
+  NS_ENSURE_TRUE(mState == STATE_START || mState == STATE_TRANSFER,
+                 NS_ERROR_UNEXPECTED);
+
+  // If canceled, do not retarget. Return with canceled status.
+  if (NS_FAILED(mStatus)) {
+    return mStatus;
+  }
+
+  if (aNewTarget == mTargetThread) {
+    NS_WARNING("Retargeting delivery to same thread");
+    return NS_OK;
+  }
+
+  if (mOffMainThread) {
+    // Don't support retargeting if this pump is already used off the main
+    // thread.
+    return NS_ERROR_FAILURE;
+  }
+
+  // Ensure that |mListener| and any subsequent listeners can be retargeted
+  // to another thread.
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIThreadRetargetableStreamListener> retargetableListener =
+      do_QueryInterface(mListener, &rv);
+  if (NS_SUCCEEDED(rv) && retargetableListener) {
+    rv = retargetableListener->CheckListenerChain();
+    if (NS_SUCCEEDED(rv)) {
+      mTargetThread = aNewTarget;
+      mRetargeting = true;
+    }
+  }
+  LOG(
+      ("nsInputStreamPump::RetargetDeliveryTo [this=%p aNewTarget=%p] "
+       "%s listener [%p] rv[%" PRIx32 "]",
+       this, aNewTarget, (mTargetThread == aNewTarget ? "success" : "failure"),
+       (nsIStreamListener*)mListener, static_cast<uint32_t>(rv)));
+  return rv;
+}
+
+NS_IMETHODIMP
+nsInputStreamPump::GetDeliveryTarget(nsISerialEventTarget** aNewTarget) {
+  RecursiveMutexAutoLock lock(mMutex);
+
+  nsCOMPtr<nsISerialEventTarget> target = mTargetThread;
+  target.forget(aNewTarget);
+  return NS_OK;
+}