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Diffstat (limited to 'netwerk/base/nsIncrementalStreamLoader.cpp')
| -rw-r--r-- | netwerk/base/nsIncrementalStreamLoader.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/netwerk/base/nsIncrementalStreamLoader.cpp b/netwerk/base/nsIncrementalStreamLoader.cpp new file mode 100644 index 0000000000..572fe62fdb --- /dev/null +++ b/netwerk/base/nsIncrementalStreamLoader.cpp @@ -0,0 +1,185 @@ +/* -*- 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 "nsIncrementalStreamLoader.h" +#include "nsIInputStream.h" +#include "nsIChannel.h" +#include "nsError.h" +#include "mozilla/ProfilerLabels.h" + +#include <limits> + +nsIncrementalStreamLoader::nsIncrementalStreamLoader() = default; + +NS_IMETHODIMP +nsIncrementalStreamLoader::Init(nsIIncrementalStreamLoaderObserver* observer) { + NS_ENSURE_ARG_POINTER(observer); + mObserver = observer; + return NS_OK; +} + +nsresult nsIncrementalStreamLoader::Create(REFNSIID aIID, void** aResult) { + RefPtr<nsIncrementalStreamLoader> it = new nsIncrementalStreamLoader(); + return it->QueryInterface(aIID, aResult); +} + +NS_IMPL_ISUPPORTS(nsIncrementalStreamLoader, nsIIncrementalStreamLoader, + nsIRequestObserver, nsIStreamListener, + nsIThreadRetargetableStreamListener) + +NS_IMETHODIMP +nsIncrementalStreamLoader::GetNumBytesRead(uint32_t* aNumBytes) { + *aNumBytes = mBytesRead; + return NS_OK; +} + +/* readonly attribute nsIRequest request; */ +NS_IMETHODIMP +nsIncrementalStreamLoader::GetRequest(nsIRequest** aRequest) { + *aRequest = do_AddRef(mRequest).take(); + return NS_OK; +} + +NS_IMETHODIMP +nsIncrementalStreamLoader::OnStartRequest(nsIRequest* request) { + nsCOMPtr<nsIChannel> chan(do_QueryInterface(request)); + if (chan) { + int64_t contentLength = -1; + chan->GetContentLength(&contentLength); + if (contentLength >= 0) { + // On 64bit platforms size of uint64_t coincides with the size of size_t, + // so we want to compare with the minimum from size_t and int64_t. + if (static_cast<uint64_t>(contentLength) > + std::min(std::numeric_limits<size_t>::max(), + static_cast<size_t>(std::numeric_limits<int64_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; + } + } + } + return NS_OK; +} + +NS_IMETHODIMP +nsIncrementalStreamLoader::OnStopRequest(nsIRequest* request, + nsresult aStatus) { + AUTO_PROFILER_LABEL("nsIncrementalStreamLoader::OnStopRequest", NETWORK); + + if (mObserver) { + // provide nsIIncrementalStreamLoader::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; + } + return NS_OK; +} + +nsresult nsIncrementalStreamLoader::WriteSegmentFun( + nsIInputStream* inStr, void* closure, const char* fromSegment, + uint32_t toOffset, uint32_t count, uint32_t* writeCount) { + nsIncrementalStreamLoader* self = (nsIncrementalStreamLoader*)closure; + + const uint8_t* data = reinterpret_cast<const uint8_t*>(fromSegment); + uint32_t consumedCount = 0; + nsresult rv; + if (self->mData.empty()) { + // Shortcut when observer wants to keep the listener's buffer empty. + rv = self->mObserver->OnIncrementalData(self, self->mContext, count, data, + &consumedCount); + + if (rv != NS_OK) { + return rv; + } + + if (consumedCount > count) { + return NS_ERROR_INVALID_ARG; + } + + if (consumedCount < count) { + if (!self->mData.append(fromSegment + consumedCount, + count - consumedCount)) { + self->mData.clearAndFree(); + return NS_ERROR_OUT_OF_MEMORY; + } + } + } else { + // We have some non-consumed data from previous OnIncrementalData call, + // appending new data and reporting combined data. + if (!self->mData.append(fromSegment, count)) { + self->mData.clearAndFree(); + return NS_ERROR_OUT_OF_MEMORY; + } + size_t length = self->mData.length(); + uint32_t reportCount = length > UINT32_MAX ? UINT32_MAX : (uint32_t)length; + uint8_t* elems = self->mData.extractOrCopyRawBuffer(); + + rv = self->mObserver->OnIncrementalData(self, self->mContext, reportCount, + elems, &consumedCount); + + // We still own elems, freeing its memory when exiting scope. + if (rv != NS_OK) { + free(elems); + return rv; + } + + if (consumedCount > reportCount) { + free(elems); + return NS_ERROR_INVALID_ARG; + } + + if (consumedCount == length) { + free(elems); // good case -- fully consumed data + } else { + // Adopting elems back (at least its portion). + self->mData.replaceRawBuffer(elems, length); + if (consumedCount > 0) { + self->mData.erase(self->mData.begin() + consumedCount); + } + } + } + + *writeCount = count; + return NS_OK; +} + +NS_IMETHODIMP +nsIncrementalStreamLoader::OnDataAvailable(nsIRequest* request, + nsIInputStream* inStr, + uint64_t sourceOffset, + uint32_t count) { + if (mObserver) { + // provide nsIIncrementalStreamLoader::request during call to + // OnStreamComplete + mRequest = request; + } + uint32_t countRead; + nsresult rv = inStr->ReadSegments(WriteSegmentFun, this, count, &countRead); + mRequest = nullptr; + NS_ENSURE_SUCCESS(rv, rv); + mBytesRead += countRead; + return rv; +} + +void nsIncrementalStreamLoader::ReleaseData() { mData.clearAndFree(); } + +NS_IMETHODIMP +nsIncrementalStreamLoader::CheckListenerChain() { return NS_OK; } |