зеркало из https://github.com/mozilla/gecko-dev.git
139 строки
4.1 KiB
C++
139 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsStreamLoader.h"
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#include "nsIInputStream.h"
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#include "nsIChannel.h"
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#include "nsError.h"
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#include "GeckoProfiler.h"
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#include <limits>
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namespace mozilla {
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namespace net {
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nsStreamLoader::nsStreamLoader() : mData() {}
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NS_IMETHODIMP
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nsStreamLoader::Init(nsIStreamLoaderObserver* aStreamObserver,
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nsIRequestObserver* aRequestObserver) {
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NS_ENSURE_ARG_POINTER(aStreamObserver);
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mObserver = aStreamObserver;
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mRequestObserver = aRequestObserver;
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return NS_OK;
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}
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nsresult nsStreamLoader::Create(nsISupports* aOuter, REFNSIID aIID,
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void** aResult) {
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if (aOuter) return NS_ERROR_NO_AGGREGATION;
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RefPtr<nsStreamLoader> it = new nsStreamLoader();
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return it->QueryInterface(aIID, aResult);
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}
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NS_IMPL_ISUPPORTS(nsStreamLoader, nsIStreamLoader, nsIRequestObserver,
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nsIStreamListener, nsIThreadRetargetableStreamListener)
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NS_IMETHODIMP
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nsStreamLoader::GetNumBytesRead(uint32_t* aNumBytes) {
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*aNumBytes = mData.length();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStreamLoader::GetRequest(nsIRequest** aRequest) {
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nsCOMPtr<nsIRequest> req = mRequest;
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req.forget(aRequest);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStreamLoader::OnStartRequest(nsIRequest* request) {
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nsCOMPtr<nsIChannel> chan(do_QueryInterface(request));
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if (chan) {
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int64_t contentLength = -1;
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chan->GetContentLength(&contentLength);
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if (contentLength >= 0) {
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// On 64bit platforms size of uint64_t coincides with the size of size_t,
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// so we want to compare with the minimum from size_t and int64_t.
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if (static_cast<uint64_t>(contentLength) >
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std::min(std::numeric_limits<size_t>::max(),
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static_cast<size_t>(std::numeric_limits<int64_t>::max()))) {
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// Too big to fit into size_t, so let's bail.
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// preallocate buffer
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if (!mData.initCapacity(contentLength)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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}
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if (mRequestObserver) {
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mRequestObserver->OnStartRequest(request);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStreamLoader::OnStopRequest(nsIRequest* request, nsresult aStatus) {
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AUTO_PROFILER_LABEL("nsStreamLoader::OnStopRequest", NETWORK);
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if (mObserver) {
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// provide nsIStreamLoader::request during call to OnStreamComplete
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mRequest = request;
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size_t length = mData.length();
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uint8_t* elems = mData.extractOrCopyRawBuffer();
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nsresult rv =
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mObserver->OnStreamComplete(this, mContext, aStatus, length, elems);
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if (rv != NS_SUCCESS_ADOPTED_DATA) {
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// The observer didn't take ownership of the extracted data buffer, so
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// put it back into mData.
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mData.replaceRawBuffer(elems, length);
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}
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// done.. cleanup
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ReleaseData();
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mRequest = nullptr;
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mObserver = nullptr;
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}
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if (mRequestObserver) {
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mRequestObserver->OnStopRequest(request, aStatus);
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mRequestObserver = nullptr;
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}
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return NS_OK;
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}
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nsresult nsStreamLoader::WriteSegmentFun(nsIInputStream* inStr, void* closure,
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const char* fromSegment,
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uint32_t toOffset, uint32_t count,
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uint32_t* writeCount) {
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nsStreamLoader* self = (nsStreamLoader*)closure;
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if (!self->mData.append(fromSegment, count)) {
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self->mData.clearAndFree();
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*writeCount = count;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStreamLoader::OnDataAvailable(nsIRequest* request, nsIInputStream* inStr,
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uint64_t sourceOffset, uint32_t count) {
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uint32_t countRead;
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return inStr->ReadSegments(WriteSegmentFun, this, count, &countRead);
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}
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void nsStreamLoader::ReleaseData() { mData.clearAndFree(); }
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NS_IMETHODIMP
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nsStreamLoader::CheckListenerChain() { return NS_OK; }
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} // namespace net
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} // namespace mozilla
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