Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

1 files changed, 1197 insertions, 0 deletions

diff --git a/netwerk/base/nsBufferedStreams.cpp b/netwerk/base/nsBufferedStreams.cpp
new file mode 100644
index 0000000000..2606352cc4
--- /dev/null
+++ b/netwerk/base/nsBufferedStreams.cpp
@@ -0,0 +1,1197 @@
+/* -*- 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/. */
+
+#include "nsBufferedStreams.h"
+#include "nsStreamUtils.h"
+#include "nsNetCID.h"
+#include "nsIClassInfoImpl.h"
+#include "nsIEventTarget.h"
+#include "nsThreadUtils.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/ipc/InputStreamUtils.h"
+#include <algorithm>
+
+#ifdef DEBUG_brendan
+#  define METERING
+#endif
+
+#ifdef METERING
+#  include <stdio.h>
+#  define METER(x) x
+#  define MAX_BIG_SEEKS 20
+
+static struct {
+  uint32_t mSeeksWithinBuffer;
+  uint32_t mSeeksOutsideBuffer;
+  uint32_t mBufferReadUponSeek;
+  uint32_t mBufferUnreadUponSeek;
+  uint32_t mBytesReadFromBuffer;
+  uint32_t mBigSeekIndex;
+  struct {
+    int64_t mOldOffset;
+    int64_t mNewOffset;
+  } mBigSeek[MAX_BIG_SEEKS];
+} bufstats;
+#else
+#  define METER(x) /* nothing */
+#endif
+
+using namespace mozilla::ipc;
+using namespace mozilla;
+
+////////////////////////////////////////////////////////////////////////////////
+// nsBufferedStream
+
+nsBufferedStream::~nsBufferedStream() { Close(); }
+
+NS_IMPL_ADDREF(nsBufferedStream)
+NS_IMPL_RELEASE(nsBufferedStream)
+
+NS_INTERFACE_MAP_BEGIN(nsBufferedStream)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+  NS_INTERFACE_MAP_ENTRY(nsITellableStream)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISeekableStream, mSeekable)
+NS_INTERFACE_MAP_END
+
+nsresult nsBufferedStream::Init(nsISupports* aStream, uint32_t bufferSize) {
+  NS_ASSERTION(aStream, "need to supply a stream");
+  NS_ASSERTION(mStream == nullptr, "already inited");
+  mStream = aStream;  // we keep a reference until nsBufferedStream::Close
+  mBufferSize = bufferSize;
+  mBufferStartOffset = 0;
+  mCursor = 0;
+  nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mStream);
+  mSeekable = seekable;
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  mBuffer = new (mozilla::fallible) char[bufferSize];
+  if (mBuffer == nullptr) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  return NS_OK;
+}
+
+void nsBufferedStream::Close() {
+  // Drop the reference from nsBufferedStream::Init()
+  mStream = nullptr;
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  if (mBuffer) {
+    delete[] mBuffer;
+    mBuffer = nullptr;
+    mBufferSize = 0;
+    mBufferStartOffset = 0;
+    mCursor = 0;
+    mFillPoint = 0;
+  }
+#ifdef METERING
+  {
+    static FILE* tfp;
+    if (!tfp) {
+      tfp = fopen("/tmp/bufstats", "w");
+      if (tfp) {
+        setvbuf(tfp, nullptr, _IOLBF, 0);
+      }
+    }
+    if (tfp) {
+      fprintf(tfp, "seeks within buffer:    %u\n", bufstats.mSeeksWithinBuffer);
+      fprintf(tfp, "seeks outside buffer:   %u\n",
+              bufstats.mSeeksOutsideBuffer);
+      fprintf(tfp, "buffer read on seek:    %u\n",
+              bufstats.mBufferReadUponSeek);
+      fprintf(tfp, "buffer unread on seek:  %u\n",
+              bufstats.mBufferUnreadUponSeek);
+      fprintf(tfp, "bytes read from buffer: %u\n",
+              bufstats.mBytesReadFromBuffer);
+      for (uint32_t i = 0; i < bufstats.mBigSeekIndex; i++) {
+        fprintf(tfp, "bigseek[%u] = {old: %u, new: %u}\n", i,
+                bufstats.mBigSeek[i].mOldOffset,
+                bufstats.mBigSeek[i].mNewOffset);
+      }
+    }
+  }
+#endif
+}
+
+NS_IMETHODIMP
+nsBufferedStream::Seek(int32_t whence, int64_t offset) {
+  if (mStream == nullptr) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  // If the underlying stream isn't a random access store, then fail early.
+  // We could possibly succeed for the case where the seek position denotes
+  // something that happens to be read into the buffer, but that would make
+  // the failure data-dependent.
+  nsresult rv;
+  nsCOMPtr<nsISeekableStream> ras = do_QueryInterface(mStream, &rv);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("mStream doesn't QI to nsISeekableStream");
+    return rv;
+  }
+
+  int64_t absPos = 0;
+  switch (whence) {
+    case nsISeekableStream::NS_SEEK_SET:
+      absPos = offset;
+      break;
+    case nsISeekableStream::NS_SEEK_CUR:
+      absPos = mBufferStartOffset;
+      absPos += mCursor;
+      absPos += offset;
+      break;
+    case nsISeekableStream::NS_SEEK_END:
+      absPos = -1;
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("bogus seek whence parameter");
+      return NS_ERROR_UNEXPECTED;
+  }
+
+  // Let mCursor point into the existing buffer if the new position is
+  // between the current cursor and the mFillPoint "fencepost" -- the
+  // client may never get around to a Read or Write after this Seek.
+  // Read and Write worry about flushing and filling in that event.
+  // But if we're at EOF, make sure to pass the seek through to the
+  // underlying stream, because it may have auto-closed itself and
+  // needs to reopen.
+  uint32_t offsetInBuffer = uint32_t(absPos - mBufferStartOffset);
+  if (offsetInBuffer <= mFillPoint && !mEOF) {
+    METER(bufstats.mSeeksWithinBuffer++);
+    mCursor = offsetInBuffer;
+    return NS_OK;
+  }
+
+  METER(bufstats.mSeeksOutsideBuffer++);
+  METER(bufstats.mBufferReadUponSeek += mCursor);
+  METER(bufstats.mBufferUnreadUponSeek += mFillPoint - mCursor);
+  rv = Flush();
+  if (NS_FAILED(rv)) {
+#ifdef DEBUG
+    NS_WARNING(
+        "(debug) Flush returned error within nsBufferedStream::Seek, so we "
+        "exit early.");
+#endif
+    return rv;
+  }
+
+  rv = ras->Seek(whence, offset);
+  if (NS_FAILED(rv)) {
+#ifdef DEBUG
+    NS_WARNING(
+        "(debug) Error: ras->Seek() returned error within "
+        "nsBufferedStream::Seek, so we exit early.");
+#endif
+    return rv;
+  }
+
+  mEOF = false;
+
+  // Recompute whether the offset we're seeking to is in our buffer.
+  // Note that we need to recompute because Flush() might have
+  // changed mBufferStartOffset.
+  offsetInBuffer = uint32_t(absPos - mBufferStartOffset);
+  if (offsetInBuffer <= mFillPoint) {
+    // It's safe to just set mCursor to offsetInBuffer.  In particular, we
+    // want to avoid calling Fill() here since we already have the data that
+    // was seeked to and calling Fill() might auto-close our underlying
+    // stream in some cases.
+    mCursor = offsetInBuffer;
+    return NS_OK;
+  }
+
+  METER(if (bufstats.mBigSeekIndex < MAX_BIG_SEEKS)
+            bufstats.mBigSeek[bufstats.mBigSeekIndex]
+                .mOldOffset = mBufferStartOffset + int64_t(mCursor));
+  const int64_t minus1 = -1;
+  if (absPos == minus1) {
+    // then we had the SEEK_END case, above
+    int64_t tellPos;
+    rv = ras->Tell(&tellPos);
+    mBufferStartOffset = tellPos;
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  } else {
+    mBufferStartOffset = absPos;
+  }
+  METER(if (bufstats.mBigSeekIndex < MAX_BIG_SEEKS)
+            bufstats.mBigSeek[bufstats.mBigSeekIndex++]
+                .mNewOffset = mBufferStartOffset);
+
+  mFillPoint = mCursor = 0;
+
+  // If we seeked back to the start, then don't fill the buffer
+  // right now in case this is a lazily-opened file stream.
+  // We'll fill on the first read, like we did initially.
+  if (whence == nsISeekableStream::NS_SEEK_SET && offset == 0) {
+    return NS_OK;
+  }
+  return Fill();
+}
+
+NS_IMETHODIMP
+nsBufferedStream::Tell(int64_t* result) {
+  if (mStream == nullptr) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  int64_t result64 = mBufferStartOffset;
+  result64 += mCursor;
+  *result = result64;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedStream::SetEOF() {
+  if (mStream == nullptr) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsISeekableStream> ras = do_QueryInterface(mStream, &rv);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  rv = ras->SetEOF();
+  if (NS_SUCCEEDED(rv)) {
+    mEOF = true;
+  }
+
+  return rv;
+}
+
+nsresult nsBufferedStream::GetData(nsISupports** aResult) {
+  nsCOMPtr<nsISupports> stream(mStream);
+  stream.forget(aResult);
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsBufferedInputStream
+
+NS_IMPL_ADDREF_INHERITED(nsBufferedInputStream, nsBufferedStream)
+NS_IMPL_RELEASE_INHERITED(nsBufferedInputStream, nsBufferedStream)
+
+NS_IMPL_CLASSINFO(nsBufferedInputStream, nullptr, nsIClassInfo::THREADSAFE,
+                  NS_BUFFEREDINPUTSTREAM_CID)
+
+NS_INTERFACE_MAP_BEGIN(nsBufferedInputStream)
+  // Unfortunately there isn't a macro that combines ambiguous and conditional,
+  // and as far as I can tell, no other class would need such a macro.
+  if (mIsAsyncInputStream && aIID.Equals(NS_GET_IID(nsIInputStream))) {
+    foundInterface =
+        static_cast<nsIInputStream*>(static_cast<nsIAsyncInputStream*>(this));
+  } else if (!mIsAsyncInputStream && aIID.Equals(NS_GET_IID(nsIInputStream))) {
+    foundInterface = static_cast<nsIInputStream*>(
+        static_cast<nsIBufferedInputStream*>(this));
+  } else
+    NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIBufferedInputStream)
+  NS_INTERFACE_MAP_ENTRY(nsIBufferedInputStream)
+  NS_INTERFACE_MAP_ENTRY(nsIStreamBufferAccess)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIIPCSerializableInputStream,
+                                     mIsIPCSerializable)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStream, mIsAsyncInputStream)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamCallback,
+                                     mIsAsyncInputStream)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICloneableInputStream,
+                                     mIsCloneableInputStream)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamLength, mIsInputStreamLength)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStreamLength,
+                                     mIsAsyncInputStreamLength)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamLengthCallback,
+                                     mIsAsyncInputStreamLength)
+  NS_IMPL_QUERY_CLASSINFO(nsBufferedInputStream)
+NS_INTERFACE_MAP_END_INHERITING(nsBufferedStream)
+
+NS_IMPL_CI_INTERFACE_GETTER(nsBufferedInputStream, nsIInputStream,
+                            nsIBufferedInputStream, nsISeekableStream,
+                            nsITellableStream, nsIStreamBufferAccess)
+
+nsresult nsBufferedInputStream::Create(REFNSIID aIID, void** aResult) {
+  RefPtr<nsBufferedInputStream> stream = new nsBufferedInputStream();
+  return stream->QueryInterface(aIID, aResult);
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::Init(nsIInputStream* stream, uint32_t bufferSize) {
+  nsresult rv = nsBufferedStream::Init(stream, bufferSize);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  {
+    nsCOMPtr<nsIIPCSerializableInputStream> stream = do_QueryInterface(mStream);
+    mIsIPCSerializable = !!stream;
+  }
+
+  {
+    nsCOMPtr<nsIAsyncInputStream> stream = do_QueryInterface(mStream);
+    mIsAsyncInputStream = !!stream;
+  }
+
+  {
+    nsCOMPtr<nsICloneableInputStream> stream = do_QueryInterface(mStream);
+    mIsCloneableInputStream = !!stream;
+  }
+
+  {
+    nsCOMPtr<nsIInputStreamLength> stream = do_QueryInterface(mStream);
+    mIsInputStreamLength = !!stream;
+  }
+
+  {
+    nsCOMPtr<nsIAsyncInputStreamLength> stream = do_QueryInterface(mStream);
+    mIsAsyncInputStreamLength = !!stream;
+  }
+
+  return NS_OK;
+}
+
+already_AddRefed<nsIInputStream> nsBufferedInputStream::GetInputStream() {
+  // A non-null mStream implies Init() has been called.
+  MOZ_ASSERT(mStream);
+
+  nsIInputStream* out = nullptr;
+  DebugOnly<nsresult> rv = QueryInterface(NS_GET_IID(nsIInputStream),
+                                          reinterpret_cast<void**>(&out));
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  MOZ_ASSERT(out);
+
+  return already_AddRefed<nsIInputStream>(out);
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::Close() {
+  nsresult rv = NS_OK;
+  if (mStream) {
+    rv = Source()->Close();
+    if (NS_FAILED(rv)) {
+      NS_WARNING(
+          "(debug) Error: Source()->Close() returned error in "
+          "bsBuffedInputStream::Close().");
+    }
+  }
+
+  nsBufferedStream::Close();
+  return rv;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::Available(uint64_t* result) {
+  *result = 0;
+
+  if (!mStream) {
+    return NS_OK;
+  }
+
+  uint64_t avail = mFillPoint - mCursor;
+
+  uint64_t tmp;
+  nsresult rv = Source()->Available(&tmp);
+  if (NS_SUCCEEDED(rv)) {
+    avail += tmp;
+  }
+
+  if (avail) {
+    *result = avail;
+    return NS_OK;
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::StreamStatus() {
+  if (!mStream) {
+    return NS_OK;
+  }
+
+  if (mFillPoint - mCursor) {
+    return NS_OK;
+  }
+
+  return Source()->StreamStatus();
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::Read(char* buf, uint32_t count, uint32_t* result) {
+  if (mBufferDisabled) {
+    if (!mStream) {
+      *result = 0;
+      return NS_OK;
+    }
+    nsresult rv = Source()->Read(buf, count, result);
+    if (NS_SUCCEEDED(rv)) {
+      mBufferStartOffset += *result;  // so nsBufferedStream::Tell works
+      if (*result == 0) {
+        mEOF = true;
+      }
+    }
+    return rv;
+  }
+
+  return ReadSegments(NS_CopySegmentToBuffer, buf, count, result);
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::ReadSegments(nsWriteSegmentFun writer, void* closure,
+                                    uint32_t count, uint32_t* result) {
+  *result = 0;
+
+  if (!mStream) {
+    return NS_OK;
+  }
+
+  nsresult rv = NS_OK;
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  while (count > 0) {
+    uint32_t amt = std::min(count, mFillPoint - mCursor);
+    if (amt > 0) {
+      uint32_t read = 0;
+      rv = writer(static_cast<nsIBufferedInputStream*>(this), closure,
+                  mBuffer + mCursor, *result, amt, &read);
+      if (NS_FAILED(rv)) {
+        // errors returned from the writer end here!
+        rv = NS_OK;
+        break;
+      }
+      *result += read;
+      count -= read;
+      mCursor += read;
+    } else {
+      rv = Fill();
+      if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
+        break;
+      }
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+      if (mFillPoint == mCursor) {
+        break;
+      }
+    }
+  }
+  return (*result > 0) ? NS_OK : rv;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::IsNonBlocking(bool* aNonBlocking) {
+  if (mStream) {
+    return Source()->IsNonBlocking(aNonBlocking);
+  }
+  return NS_ERROR_NOT_INITIALIZED;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::Fill() {
+  if (mBufferDisabled) {
+    return NS_OK;
+  }
+  NS_ENSURE_TRUE(mStream, NS_ERROR_NOT_INITIALIZED);
+
+  RecursiveMutexAutoLock lock(mBufferMutex);
+
+  nsresult rv;
+  int32_t rem = int32_t(mFillPoint - mCursor);
+  if (rem > 0) {
+    // slide the remainder down to the start of the buffer
+    // |<------------->|<--rem-->|<--->|
+    // b               c         f     s
+    memcpy(mBuffer, mBuffer + mCursor, rem);
+  }
+  mBufferStartOffset += mCursor;
+  mFillPoint = rem;
+  mCursor = 0;
+
+  uint32_t amt;
+  rv = Source()->Read(mBuffer + mFillPoint, mBufferSize - mFillPoint, &amt);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (amt == 0) {
+    mEOF = true;
+  }
+
+  mFillPoint += amt;
+  return NS_OK;
+}
+
+NS_IMETHODIMP_(char*)
+nsBufferedInputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask) {
+  NS_ASSERTION(mGetBufferCount == 0, "nested GetBuffer!");
+  if (mGetBufferCount != 0) {
+    return nullptr;
+  }
+
+  if (mBufferDisabled) {
+    return nullptr;
+  }
+
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  char* buf = mBuffer + mCursor;
+  uint32_t rem = mFillPoint - mCursor;
+  if (rem == 0) {
+    if (NS_FAILED(Fill())) {
+      return nullptr;
+    }
+    buf = mBuffer + mCursor;
+    rem = mFillPoint - mCursor;
+  }
+
+  uint32_t mod = (NS_PTR_TO_INT32(buf) & aAlignMask);
+  if (mod) {
+    uint32_t pad = aAlignMask + 1 - mod;
+    if (pad > rem) {
+      return nullptr;
+    }
+
+    memset(buf, 0, pad);
+    mCursor += pad;
+    buf += pad;
+    rem -= pad;
+  }
+
+  if (aLength > rem) {
+    return nullptr;
+  }
+  mGetBufferCount++;
+  return buf;
+}
+
+NS_IMETHODIMP_(void)
+nsBufferedInputStream::PutBuffer(char* aBuffer, uint32_t aLength) {
+  NS_ASSERTION(mGetBufferCount == 1, "stray PutBuffer!");
+  if (--mGetBufferCount != 0) {
+    return;
+  }
+
+  NS_ASSERTION(mCursor + aLength <= mFillPoint, "PutBuffer botch");
+  mCursor += aLength;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::DisableBuffering() {
+  NS_ASSERTION(!mBufferDisabled, "redundant call to DisableBuffering!");
+  NS_ASSERTION(mGetBufferCount == 0,
+               "DisableBuffer call between GetBuffer and PutBuffer!");
+  if (mGetBufferCount != 0) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // Empty the buffer so nsBufferedStream::Tell works.
+  mBufferStartOffset += mCursor;
+  mFillPoint = mCursor = 0;
+  mBufferDisabled = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::EnableBuffering() {
+  NS_ASSERTION(mBufferDisabled, "gratuitous call to EnableBuffering!");
+  mBufferDisabled = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::GetUnbufferedStream(nsISupports** aStream) {
+  // Empty the buffer so subsequent i/o trumps any buffered data.
+  mBufferStartOffset += mCursor;
+  mFillPoint = mCursor = 0;
+
+  nsCOMPtr<nsISupports> stream = mStream;
+  stream.forget(aStream);
+  return NS_OK;
+}
+
+void nsBufferedInputStream::SerializedComplexity(uint32_t aMaxSize,
+                                                 uint32_t* aSizeUsed,
+                                                 uint32_t* aPipes,
+                                                 uint32_t* aTransferables) {
+  if (mStream) {
+    nsCOMPtr<nsIInputStream> stream = do_QueryInterface(mStream);
+    MOZ_ASSERT(stream);
+
+    InputStreamHelper::SerializedComplexity(stream, aMaxSize, aSizeUsed, aPipes,
+                                            aTransferables);
+  }
+}
+
+void nsBufferedInputStream::Serialize(InputStreamParams& aParams,
+                                      uint32_t aMaxSize, uint32_t* aSizeUsed) {
+  MOZ_ASSERT(aSizeUsed);
+  *aSizeUsed = 0;
+
+  BufferedInputStreamParams params;
+
+  if (mStream) {
+    nsCOMPtr<nsIInputStream> stream = do_QueryInterface(mStream);
+    MOZ_ASSERT(stream);
+
+    InputStreamParams wrappedParams;
+    InputStreamHelper::SerializeInputStream(stream, wrappedParams, aMaxSize,
+                                            aSizeUsed);
+
+    params.optionalStream().emplace(wrappedParams);
+  }
+
+  params.bufferSize() = mBufferSize;
+
+  aParams = params;
+}
+
+bool nsBufferedInputStream::Deserialize(const InputStreamParams& aParams) {
+  if (aParams.type() != InputStreamParams::TBufferedInputStreamParams) {
+    NS_ERROR("Received unknown parameters from the other process!");
+    return false;
+  }
+
+  const BufferedInputStreamParams& params =
+      aParams.get_BufferedInputStreamParams();
+  const Maybe<InputStreamParams>& wrappedParams = params.optionalStream();
+
+  nsCOMPtr<nsIInputStream> stream;
+  if (wrappedParams.isSome()) {
+    stream = InputStreamHelper::DeserializeInputStream(wrappedParams.ref());
+    if (!stream) {
+      NS_WARNING("Failed to deserialize wrapped stream!");
+      return false;
+    }
+  }
+
+  nsresult rv = Init(stream, params.bufferSize());
+  NS_ENSURE_SUCCESS(rv, false);
+
+  return true;
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::CloseWithStatus(nsresult aStatus) { return Close(); }
+
+NS_IMETHODIMP
+nsBufferedInputStream::AsyncWait(nsIInputStreamCallback* aCallback,
+                                 uint32_t aFlags, uint32_t aRequestedCount,
+                                 nsIEventTarget* aEventTarget) {
+  nsCOMPtr<nsIAsyncInputStream> stream = do_QueryInterface(mStream);
+  if (!stream) {
+    // Stream is probably closed. Callback, if not nullptr, can be executed
+    // immediately
+    if (!aCallback) {
+      return NS_OK;
+    }
+
+    if (aEventTarget) {
+      nsCOMPtr<nsIInputStreamCallback> callable = NS_NewInputStreamReadyEvent(
+          "nsBufferedInputStream::OnInputStreamReady", aCallback, aEventTarget);
+      return callable->OnInputStreamReady(this);
+    }
+
+    aCallback->OnInputStreamReady(this);
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIInputStreamCallback> callback = aCallback ? this : nullptr;
+  {
+    MutexAutoLock lock(mMutex);
+
+    if (NS_WARN_IF(mAsyncWaitCallback && aCallback &&
+                   mAsyncWaitCallback != aCallback)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    mAsyncWaitCallback = aCallback;
+  }
+
+  return stream->AsyncWait(callback, aFlags, aRequestedCount, aEventTarget);
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::OnInputStreamReady(nsIAsyncInputStream* aStream) {
+  nsCOMPtr<nsIInputStreamCallback> callback;
+  {
+    MutexAutoLock lock(mMutex);
+
+    // We have been canceled in the meanwhile.
+    if (!mAsyncWaitCallback) {
+      return NS_OK;
+    }
+
+    callback.swap(mAsyncWaitCallback);
+  }
+
+  MOZ_ASSERT(callback);
+  return callback->OnInputStreamReady(this);
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::GetData(nsIInputStream** aResult) {
+  nsCOMPtr<nsISupports> stream;
+  nsBufferedStream::GetData(getter_AddRefs(stream));
+  nsCOMPtr<nsIInputStream> inputStream = do_QueryInterface(stream);
+  inputStream.forget(aResult);
+  return NS_OK;
+}
+
+// nsICloneableInputStream interface
+
+NS_IMETHODIMP
+nsBufferedInputStream::GetCloneable(bool* aCloneable) {
+  *aCloneable = false;
+
+  RecursiveMutexAutoLock lock(mBufferMutex);
+
+  // If we don't have the buffer, the inputStream has been already closed.
+  // If mBufferStartOffset is not 0, the stream has been seeked or read.
+  // In both case the cloning is not supported.
+  if (!mBuffer || mBufferStartOffset) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsICloneableInputStream> stream = do_QueryInterface(mStream);
+
+  // GetCloneable is infallible.
+  NS_ENSURE_TRUE(stream, NS_OK);
+
+  return stream->GetCloneable(aCloneable);
+}
+
+NS_IMETHODIMP
+nsBufferedInputStream::Clone(nsIInputStream** aResult) {
+  RecursiveMutexAutoLock lock(mBufferMutex);
+
+  if (!mBuffer || mBufferStartOffset) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsICloneableInputStream> stream = do_QueryInterface(mStream);
+  NS_ENSURE_TRUE(stream, NS_ERROR_FAILURE);
+
+  nsCOMPtr<nsIInputStream> clonedStream;
+  nsresult rv = stream->Clone(getter_AddRefs(clonedStream));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIBufferedInputStream> bis = new nsBufferedInputStream();
+  rv = bis->Init(clonedStream, mBufferSize);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aResult =
+      static_cast<nsBufferedInputStream*>(bis.get())->GetInputStream().take();
+
+  return NS_OK;
+}
+
+// nsIInputStreamLength
+
+NS_IMETHODIMP
+nsBufferedInputStream::Length(int64_t* aLength) {
+  nsCOMPtr<nsIInputStreamLength> stream = do_QueryInterface(mStream);
+  NS_ENSURE_TRUE(stream, NS_ERROR_FAILURE);
+
+  return stream->Length(aLength);
+}
+
+// nsIAsyncInputStreamLength
+
+NS_IMETHODIMP
+nsBufferedInputStream::AsyncLengthWait(nsIInputStreamLengthCallback* aCallback,
+                                       nsIEventTarget* aEventTarget) {
+  nsCOMPtr<nsIAsyncInputStreamLength> stream = do_QueryInterface(mStream);
+  if (!stream) {
+    // Stream is probably closed. Callback, if not nullptr, can be executed
+    // immediately
+    if (aCallback) {
+      const RefPtr<nsBufferedInputStream> self = this;
+      const nsCOMPtr<nsIInputStreamLengthCallback> callback = aCallback;
+      nsCOMPtr<nsIRunnable> runnable = NS_NewRunnableFunction(
+          "nsBufferedInputStream::OnInputStreamLengthReady",
+          [self, callback] { callback->OnInputStreamLengthReady(self, -1); });
+
+      if (aEventTarget) {
+        aEventTarget->Dispatch(runnable, NS_DISPATCH_NORMAL);
+      } else {
+        runnable->Run();
+      }
+    }
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIInputStreamLengthCallback> callback = aCallback ? this : nullptr;
+  {
+    MutexAutoLock lock(mMutex);
+    mAsyncInputStreamLengthCallback = aCallback;
+  }
+
+  MOZ_ASSERT(stream);
+  return stream->AsyncLengthWait(callback, aEventTarget);
+}
+
+// nsIInputStreamLengthCallback
+
+NS_IMETHODIMP
+nsBufferedInputStream::OnInputStreamLengthReady(
+    nsIAsyncInputStreamLength* aStream, int64_t aLength) {
+  nsCOMPtr<nsIInputStreamLengthCallback> callback;
+  {
+    MutexAutoLock lock(mMutex);
+    // We have been canceled in the meanwhile.
+    if (!mAsyncInputStreamLengthCallback) {
+      return NS_OK;
+    }
+
+    callback.swap(mAsyncInputStreamLengthCallback);
+  }
+
+  MOZ_ASSERT(callback);
+  return callback->OnInputStreamLengthReady(this, aLength);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsBufferedOutputStream
+
+NS_IMPL_ADDREF_INHERITED(nsBufferedOutputStream, nsBufferedStream)
+NS_IMPL_RELEASE_INHERITED(nsBufferedOutputStream, nsBufferedStream)
+// This QI uses NS_INTERFACE_MAP_ENTRY_CONDITIONAL to check for
+// non-nullness of mSafeStream.
+NS_INTERFACE_MAP_BEGIN(nsBufferedOutputStream)
+  NS_INTERFACE_MAP_ENTRY(nsIOutputStream)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISafeOutputStream, mSafeStream)
+  NS_INTERFACE_MAP_ENTRY(nsIBufferedOutputStream)
+  NS_INTERFACE_MAP_ENTRY(nsIStreamBufferAccess)
+NS_INTERFACE_MAP_END_INHERITING(nsBufferedStream)
+
+nsresult nsBufferedOutputStream::Create(REFNSIID aIID, void** aResult) {
+  RefPtr<nsBufferedOutputStream> stream = new nsBufferedOutputStream();
+  return stream->QueryInterface(aIID, aResult);
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::Init(nsIOutputStream* stream, uint32_t bufferSize) {
+  // QI stream to an nsISafeOutputStream, to see if we should support it
+  mSafeStream = do_QueryInterface(stream);
+
+  return nsBufferedStream::Init(stream, bufferSize);
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::Close() {
+  if (!mStream) {
+    return NS_OK;
+  }
+
+  nsresult rv1, rv2 = NS_OK;
+
+  rv1 = Flush();
+
+#ifdef DEBUG
+  if (NS_FAILED(rv1)) {
+    NS_WARNING(
+        "(debug) Flush() inside nsBufferedOutputStream::Close() returned error "
+        "(rv1).");
+  }
+#endif
+
+  // If we fail to Flush all the data, then we close anyway and drop the
+  // remaining data in the buffer. We do this because it's what Unix does
+  // for fclose and close. However, we report the error from Flush anyway.
+  if (mStream) {
+    rv2 = Sink()->Close();
+#ifdef DEBUG
+    if (NS_FAILED(rv2)) {
+      NS_WARNING(
+          "(debug) Sink->Close() inside nsBufferedOutputStream::Close() "
+          "returned error (rv2).");
+    }
+#endif
+  }
+  nsBufferedStream::Close();
+
+  if (NS_FAILED(rv1)) {
+    return rv1;
+  }
+  if (NS_FAILED(rv2)) {
+    return rv2;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::StreamStatus() {
+  return mStream ? Sink()->StreamStatus() : NS_BASE_STREAM_CLOSED;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::Write(const char* buf, uint32_t count,
+                              uint32_t* result) {
+  nsresult rv = NS_OK;
+  uint32_t written = 0;
+  *result = 0;
+  if (!mStream) {
+    // We special case this situation.
+    // We should catch the failure, NS_BASE_STREAM_CLOSED ASAP, here.
+    // If we don't, eventually Flush() is called in the while loop below
+    // after so many writes.
+    // However, Flush() returns NS_OK when mStream is null (!!),
+    // and we don't get a meaningful error, NS_BASE_STREAM_CLOSED,
+    // soon enough when we use buffered output.
+#ifdef DEBUG
+    NS_WARNING(
+        "(info) nsBufferedOutputStream::Write returns NS_BASE_STREAM_CLOSED "
+        "immediately (mStream==null).");
+#endif
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  while (count > 0) {
+    uint32_t amt = std::min(count, mBufferSize - mCursor);
+    if (amt > 0) {
+      memcpy(mBuffer + mCursor, buf + written, amt);
+      written += amt;
+      count -= amt;
+      mCursor += amt;
+      if (mFillPoint < mCursor) mFillPoint = mCursor;
+    } else {
+      NS_ASSERTION(mFillPoint, "loop in nsBufferedOutputStream::Write!");
+      rv = Flush();
+      if (NS_FAILED(rv)) {
+#ifdef DEBUG
+        NS_WARNING(
+            "(debug) Flush() returned error in nsBufferedOutputStream::Write.");
+#endif
+        break;
+      }
+    }
+  }
+  *result = written;
+  return (written > 0) ? NS_OK : rv;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::Flush() {
+  nsresult rv;
+  uint32_t amt;
+  if (!mStream) {
+    // Stream already cancelled/flushed; probably because of previous error.
+    return NS_OK;
+  }
+  // optimize : some code within C-C needs to call Seek -> Flush() often.
+  if (mFillPoint == 0) {
+    return NS_OK;
+  }
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  rv = Sink()->Write(mBuffer, mFillPoint, &amt);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  mBufferStartOffset += amt;
+  if (amt == mFillPoint) {
+    mFillPoint = mCursor = 0;
+    return NS_OK;  // flushed everything
+  }
+
+  // slide the remainder down to the start of the buffer
+  // |<-------------->|<---|----->|
+  // b                a    c      s
+  uint32_t rem = mFillPoint - amt;
+  memmove(mBuffer, mBuffer + amt, rem);
+  mFillPoint = mCursor = rem;
+  return NS_ERROR_FAILURE;  // didn't flush all
+}
+
+// nsISafeOutputStream
+NS_IMETHODIMP
+nsBufferedOutputStream::Finish() {
+  // flush the stream, to write out any buffered data...
+  nsresult rv1 = nsBufferedOutputStream::Flush();
+  nsresult rv2 = NS_OK;
+
+  if (NS_FAILED(rv1)) {
+    NS_WARNING(
+        "(debug) nsBufferedOutputStream::Flush() failed in "
+        "nsBufferedOutputStream::Finish()! Possible dataloss.");
+
+    rv2 = Sink()->Close();
+    if (NS_FAILED(rv2)) {
+      NS_WARNING(
+          "(debug) Sink()->Close() failed in nsBufferedOutputStream::Finish()! "
+          "Possible dataloss.");
+    }
+  } else {
+    rv2 = mSafeStream->Finish();
+    if (NS_FAILED(rv2)) {
+      NS_WARNING(
+          "(debug) mSafeStream->Finish() failed within "
+          "nsBufferedOutputStream::Flush()! Possible dataloss.");
+    }
+  }
+
+  // ... and close the buffered stream, so any further attempts to flush/close
+  // the buffered stream won't cause errors.
+  nsBufferedStream::Close();
+
+  // We want to return the errors precisely from Finish()
+  // and mimick the existing error handling in
+  // nsBufferedOutputStream::Close() as reference.
+
+  if (NS_FAILED(rv1)) {
+    return rv1;
+  }
+  if (NS_FAILED(rv2)) {
+    return rv2;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::WriteFrom(nsIInputStream* inStr, uint32_t count,
+                                  uint32_t* _retval) {
+  return WriteSegments(NS_CopyStreamToSegment, inStr, count, _retval);
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::WriteSegments(nsReadSegmentFun reader, void* closure,
+                                      uint32_t count, uint32_t* _retval) {
+  *_retval = 0;
+  nsresult rv;
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  while (count > 0) {
+    uint32_t left = std::min(count, mBufferSize - mCursor);
+    if (left == 0) {
+      rv = Flush();
+      if (NS_FAILED(rv)) {
+        return (*_retval > 0) ? NS_OK : rv;
+      }
+
+      continue;
+    }
+
+    uint32_t read = 0;
+    rv = reader(this, closure, mBuffer + mCursor, *_retval, left, &read);
+
+    if (NS_FAILED(rv)) {  // If we have read some data, return ok
+      return (*_retval > 0) ? NS_OK : rv;
+    }
+    mCursor += read;
+    *_retval += read;
+    count -= read;
+    mFillPoint = std::max(mFillPoint, mCursor);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::IsNonBlocking(bool* aNonBlocking) {
+  if (mStream) {
+    return Sink()->IsNonBlocking(aNonBlocking);
+  }
+  return NS_ERROR_NOT_INITIALIZED;
+}
+
+NS_IMETHODIMP_(char*)
+nsBufferedOutputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask) {
+  NS_ASSERTION(mGetBufferCount == 0, "nested GetBuffer!");
+  if (mGetBufferCount != 0) {
+    return nullptr;
+  }
+
+  if (mBufferDisabled) {
+    return nullptr;
+  }
+
+  RecursiveMutexAutoLock lock(mBufferMutex);
+  char* buf = mBuffer + mCursor;
+  uint32_t rem = mBufferSize - mCursor;
+  if (rem == 0) {
+    if (NS_FAILED(Flush())) {
+      return nullptr;
+    }
+    buf = mBuffer + mCursor;
+    rem = mBufferSize - mCursor;
+  }
+
+  uint32_t mod = (NS_PTR_TO_INT32(buf) & aAlignMask);
+  if (mod) {
+    uint32_t pad = aAlignMask + 1 - mod;
+    if (pad > rem) {
+      return nullptr;
+    }
+
+    memset(buf, 0, pad);
+    mCursor += pad;
+    buf += pad;
+    rem -= pad;
+  }
+
+  if (aLength > rem) {
+    return nullptr;
+  }
+  mGetBufferCount++;
+  return buf;
+}
+
+NS_IMETHODIMP_(void)
+nsBufferedOutputStream::PutBuffer(char* aBuffer, uint32_t aLength) {
+  NS_ASSERTION(mGetBufferCount == 1, "stray PutBuffer!");
+  if (--mGetBufferCount != 0) {
+    return;
+  }
+
+  NS_ASSERTION(mCursor + aLength <= mBufferSize, "PutBuffer botch");
+  mCursor += aLength;
+  if (mFillPoint < mCursor) {
+    mFillPoint = mCursor;
+  }
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::DisableBuffering() {
+  NS_ASSERTION(!mBufferDisabled, "redundant call to DisableBuffering!");
+  NS_ASSERTION(mGetBufferCount == 0,
+               "DisableBuffer call between GetBuffer and PutBuffer!");
+  if (mGetBufferCount != 0) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // Empty the buffer so nsBufferedStream::Tell works.
+  nsresult rv = Flush();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  mBufferDisabled = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::EnableBuffering() {
+  NS_ASSERTION(mBufferDisabled, "gratuitous call to EnableBuffering!");
+  mBufferDisabled = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::GetUnbufferedStream(nsISupports** aStream) {
+  // Empty the buffer so subsequent i/o trumps any buffered data.
+  if (mFillPoint) {
+    nsresult rv = Flush();
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  nsCOMPtr<nsISupports> stream = mStream;
+  stream.forget(aStream);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBufferedOutputStream::GetData(nsIOutputStream** aResult) {
+  nsCOMPtr<nsISupports> stream;
+  nsBufferedStream::GetData(getter_AddRefs(stream));
+  nsCOMPtr<nsIOutputStream> outputStream = do_QueryInterface(stream);
+  outputStream.forget(aResult);
+  return NS_OK;
+}
+#undef METER
+
+////////////////////////////////////////////////////////////////////////////////