import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

netwerk/base/nsStreamLoader.cpp

@@ -0,0 +1,169 @@
+/* -*- 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 "nsStreamLoader.h"
+#include "nsIInputStream.h"
+#include "nsIChannel.h"
+#include "nsError.h"
+#include "GeckoProfiler.h"
+
+#include <limits>
+
+namespace mozilla {
+namespace net {
+
+nsStreamLoader::nsStreamLoader()
+  : mData()
+{
+}
+
+nsStreamLoader::~nsStreamLoader()
+{
+}
+
+NS_IMETHODIMP
+nsStreamLoader::Init(nsIStreamLoaderObserver* aStreamObserver,
+                     nsIRequestObserver* aRequestObserver)
+{
+  NS_ENSURE_ARG_POINTER(aStreamObserver);
+  mObserver = aStreamObserver;
+  mRequestObserver = aRequestObserver;
+  return NS_OK;
+}
+
+nsresult
+nsStreamLoader::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
+{
+  if (aOuter) return NS_ERROR_NO_AGGREGATION;
+
+  nsStreamLoader* it = new nsStreamLoader();
+  if (it == nullptr)
+    return NS_ERROR_OUT_OF_MEMORY;
+  NS_ADDREF(it);
+  nsresult rv = it->QueryInterface(aIID, aResult);
+  NS_RELEASE(it);
+  return rv;
+}
+
+NS_IMPL_ISUPPORTS(nsStreamLoader, nsIStreamLoader,
+                  nsIRequestObserver, nsIStreamListener,
+                  nsIThreadRetargetableStreamListener)
+
+NS_IMETHODIMP 
+nsStreamLoader::GetNumBytesRead(uint32_t* aNumBytes)
+{
+  *aNumBytes = mData.length();
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsStreamLoader::GetRequest(nsIRequest **aRequest)
+{
+  NS_IF_ADDREF(*aRequest = mRequest);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStreamLoader::OnStartRequest(nsIRequest* request, nsISupports *ctxt)
+{
+  nsCOMPtr<nsIChannel> chan( do_QueryInterface(request) );
+  if (chan) {
+    int64_t contentLength = -1;
+    chan->GetContentLength(&contentLength);
+    if (contentLength >= 0) {
+      if (uint64_t(contentLength) > std::numeric_limits<size_t>::max()) {
+        // Too big to fit into size_t, so let's bail.
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+      // preallocate buffer
+      if (!mData.initCapacity(contentLength)) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+    }
+  }
+  mContext = ctxt;
+  if (mRequestObserver) {
+    mRequestObserver->OnStartRequest(request, ctxt);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStreamLoader::OnStopRequest(nsIRequest* request, nsISupports *ctxt,
+                              nsresult aStatus)
+{
+  PROFILER_LABEL("nsStreamLoader", "OnStopRequest",
+    js::ProfileEntry::Category::NETWORK);
+
+  if (mObserver) {
+    // provide nsIStreamLoader::request during call to OnStreamComplete
+    mRequest = request;
+    size_t length = mData.length();
+    uint8_t* elems = mData.extractOrCopyRawBuffer();
+    nsresult rv = mObserver->OnStreamComplete(this, mContext, aStatus,
+                                              length, elems);
+    if (rv != NS_SUCCESS_ADOPTED_DATA) {
+      // The observer didn't take ownership of the extracted data buffer, so
+      // put it back into mData.
+      mData.replaceRawBuffer(elems, length);
+    }
+    // done.. cleanup
+    ReleaseData();
+    mRequest = nullptr;
+    mObserver = nullptr;
+    mContext = nullptr;
+  }
+
+  if (mRequestObserver) {
+    mRequestObserver->OnStopRequest(request, ctxt, aStatus);
+    mRequestObserver = nullptr;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsStreamLoader::WriteSegmentFun(nsIInputStream *inStr,
+                                void *closure,
+                                const char *fromSegment,
+                                uint32_t toOffset,
+                                uint32_t count,
+                                uint32_t *writeCount)
+{
+  nsStreamLoader *self = (nsStreamLoader *) closure;
+
+  if (!self->mData.append(fromSegment, count)) {
+    self->mData.clearAndFree();
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  *writeCount = count;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsStreamLoader::OnDataAvailable(nsIRequest* request, nsISupports *ctxt, 
+                                nsIInputStream *inStr, 
+                                uint64_t sourceOffset, uint32_t count)
+{
+  uint32_t countRead;
+  return inStr->ReadSegments(WriteSegmentFun, this, count, &countRead);
+}
+
+void
+nsStreamLoader::ReleaseData()
+{
+  mData.clearAndFree();
+}
+
+NS_IMETHODIMP
+nsStreamLoader::CheckListenerChain()
+{
+  return NS_OK;
+}
+
+} // namespace net
+} // namespace mozilla