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Code

namespace testing {

// Populate an array with the given number of bytes.  Data is lorem ipsum
// random text, but deterministic across multiple calls.
void CreateData(uint32_t aNumBytes, nsTArray& aDataOut) {
  static const char data[] =
      "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec egestas "
      "purus eu condimentum iaculis. In accumsan leo eget odio porttitor, non "
      "rhoncus nulla vestibulum. Etiam lacinia consectetur nisl nec "
      "sollicitudin. Sed fringilla accumsan diam, pulvinar varius massa. Duis "
      "mollis dignissim felis, eget tempus nisi tristique ut. Fusce euismod, "
      "lectus non lacinia tempor, tellus diam suscipit quam, eget hendrerit "
      "lacus nunc fringilla ante. Sed ultrices massa vitae risus molestie, ut "
      "finibus quam laoreet nullam.";
  static const uint32_t dataLength = sizeof(data) - 1;

  aDataOut.SetCapacity(aNumBytes);

  while (aNumBytes > 0) {
    uint32_t amount = std::min(dataLength, aNumBytes);
    aDataOut.AppendElements(data, amount);
    aNumBytes -= amount;
  }
}

// Write the given number of bytes out to the stream.  Loop until expected
// bytes count is reached or an error occurs.
void Write(nsIOutputStream* aStream, const nsTArray& aData,
           uint32_t aOffset, uint32_t aNumBytes) {
  uint32_t remaining =
      std::min(aNumBytes, static_cast(aData.Length() - aOffset));

  while (remaining > 0) {
    uint32_t numWritten;
    nsresult rv =
        aStream->Write(aData.Elements() + aOffset, remaining, &numWritten);
    ASSERT_TRUE(NS_SUCCEEDED(rv));
    if (numWritten < 1) {
      break;
    }
    aOffset += numWritten;
    remaining -= numWritten;
  }
}

// Write the given number of bytes and then close the stream.
void WriteAllAndClose(nsIOutputStream* aStream, const nsTArray& aData) {
  Write(aStream, aData, 0, aData.Length());
  aStream->Close();
}

// Synchronously consume the given input stream and validate the resulting data
// against the given array of expected values.
void ConsumeAndValidateStream(nsIInputStream* aStream,
                              const nsTArray& aExpectedData) {
  nsDependentCSubstring data(aExpectedData.Elements(), aExpectedData.Length());
  ConsumeAndValidateStream(aStream, data);
}

// Synchronously consume the given input stream and validate the resulting data
// against the given string of expected values.
void ConsumeAndValidateStream(nsIInputStream* aStream,
                              const nsACString& aExpectedData) {
  nsAutoCString outputData;
  nsresult rv = NS_ConsumeStream(aStream, UINT32_MAX, outputData);
  ASSERT_TRUE(NS_SUCCEEDED(rv));
  ASSERT_EQ(aExpectedData.Length(), outputData.Length());
  ASSERT_TRUE(aExpectedData.Equals(outputData));
}

NS_IMPL_ISUPPORTS(OutputStreamCallback, nsIOutputStreamCallback);

OutputStreamCallback::OutputStreamCallback() : mCalled(false) {}

OutputStreamCallback::~OutputStreamCallback() = default;

NS_IMETHODIMP
OutputStreamCallback::OnOutputStreamReady(nsIAsyncOutputStream* aStream) {
  mCalled = true;
  return NS_OK;
}

NS_IMPL_ISUPPORTS(InputStreamCallback, nsIInputStreamCallback);

InputStreamCallback::InputStreamCallback() : mCalled(false) {}

InputStreamCallback::~InputStreamCallback() = default;

NS_IMETHODIMP
InputStreamCallback::OnInputStreamReady(nsIAsyncInputStream* aStream) {
  mCalled = true;
  return NS_OK;
}

AsyncStringStream::AsyncStringStream(const nsACString& aBuffer) {
  NS_NewCStringInputStream(getter_AddRefs(mStream), aBuffer);
}

NS_IMETHODIMP
AsyncStringStream::Available(uint64_t* aLength) {
  return mStream->Available(aLength);
}

NS_IMETHODIMP
AsyncStringStream::Read(char* aBuffer, uint32_t aCount, uint32_t* aReadCount) {
  return mStream->Read(aBuffer, aCount, aReadCount);
}

NS_IMETHODIMP
AsyncStringStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
                                uint32_t aCount, uint32_t* aResult) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
AsyncStringStream::Close() {
  nsresult rv = mStream->Close();
  if (NS_SUCCEEDED(rv)) {
    MaybeExecCallback(mCallback, mCallbackEventTarget);
  }
  return rv;
}

NS_IMETHODIMP
AsyncStringStream::IsNonBlocking(bool* aNonBlocking) {
  return mStream->IsNonBlocking(aNonBlocking);
}

NS_IMETHODIMP
AsyncStringStream::CloseWithStatus(nsresult aStatus) { return Close(); }

NS_IMETHODIMP
AsyncStringStream::AsyncWait(nsIInputStreamCallback* aCallback, uint32_t aFlags,
                             uint32_t aRequestedCount,
                             nsIEventTarget* aEventTarget) {
  if (aFlags & nsIAsyncInputStream::WAIT_CLOSURE_ONLY) {
    mCallback = aCallback;
    mCallbackEventTarget = aEventTarget;
    return NS_OK;
  }

  MaybeExecCallback(aCallback, aEventTarget);
  return NS_OK;
}

void AsyncStringStream::MaybeExecCallback(nsIInputStreamCallback* aCallback,
                                          nsIEventTarget* aEventTarget) {
  if (!aCallback) {
    return;
  }

  nsCOMPtr callback = aCallback;
  nsCOMPtr self = this;

  nsCOMPtr r = NS_NewRunnableFunction(
      "AsyncWait", [callback, self]() { callback->OnInputStreamReady(self); });

  if (aEventTarget) {
    aEventTarget->Dispatch(r.forget());
  } else {
    r->Run();
  }
}

NS_IMPL_ISUPPORTS(AsyncStringStream, nsIAsyncInputStream, nsIInputStream)

NS_IMPL_ADDREF(LengthInputStream);
NS_IMPL_RELEASE(LengthInputStream);

NS_INTERFACE_MAP_BEGIN(LengthInputStream)
  NS_INTERFACE_MAP_ENTRY(nsIInputStream)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamLength, mIsInputStreamLength)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStreamLength,
                                     mIsAsyncInputStreamLength)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInputStream)
NS_INTERFACE_MAP_END

NS_IMPL_ISUPPORTS(LengthCallback, nsIInputStreamLengthCallback)

}  // namespace testing