1 files changed, 71 insertions, 0 deletions
diff --git a/netwerk/base/MemoryDownloader.cpp b/netwerk/base/MemoryDownloader.cpp
new file mode 100644
index 0000000000..afb4552cca
--- /dev/null
+++ b/netwerk/base/MemoryDownloader.cpp
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; 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 "MemoryDownloader.h"
+
+#include "mozilla/Assertions.h"
+#include "nsIInputStream.h"
+
+namespace mozilla {
+namespace net {
+
+NS_IMPL_ISUPPORTS(MemoryDownloader, nsIStreamListener, nsIRequestObserver)
+
+MemoryDownloader::MemoryDownloader(IObserver* aObserver)
+    : mObserver(aObserver), mStatus(NS_ERROR_NOT_INITIALIZED) {}
+
+NS_IMETHODIMP
+MemoryDownloader::OnStartRequest(nsIRequest* aRequest) {
+  MOZ_ASSERT(!mData);
+  mData.reset(new FallibleTArray<uint8_t>());
+  mStatus = NS_OK;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+MemoryDownloader::OnStopRequest(nsIRequest* aRequest, nsresult aStatus) {
+  MOZ_ASSERT_IF(NS_FAILED(mStatus), NS_FAILED(aStatus));
+  MOZ_ASSERT(!mData == NS_FAILED(mStatus));
+  Data data;
+  data.swap(mData);
+  RefPtr<IObserver> observer;
+  observer.swap(mObserver);
+  observer->OnDownloadComplete(this, aRequest, aStatus, std::move(data));
+  return NS_OK;
+}
+
+nsresult MemoryDownloader::ConsumeData(nsIInputStream* aIn, void* aClosure,
+                                       const char* aFromRawSegment,
+                                       uint32_t aToOffset, uint32_t aCount,
+                                       uint32_t* aWriteCount) {
+  MemoryDownloader* self = static_cast<MemoryDownloader*>(aClosure);
+  if (!self->mData->AppendElements(aFromRawSegment, aCount, fallible)) {
+    // The error returned by ConsumeData isn't propagated to the
+    // return of ReadSegments, so it has to be passed as state.
+    self->mStatus = NS_ERROR_OUT_OF_MEMORY;
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  *aWriteCount = aCount;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+MemoryDownloader::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInStr,
+                                  uint64_t aSourceOffset, uint32_t aCount) {
+  uint32_t n;
+  MOZ_ASSERT(mData);
+  nsresult rv = aInStr->ReadSegments(ConsumeData, this, aCount, &n);
+  if (NS_SUCCEEDED(mStatus) && NS_FAILED(rv)) {
+    mStatus = rv;
+  }
+  if (NS_WARN_IF(NS_FAILED(mStatus))) {
+    mData.reset(nullptr);
+    return mStatus;
+  }
+  return NS_OK;
+}
+
+}  // namespace net
+}  // namespace mozilla