diff options
Diffstat (limited to 'xpcom/io/InputStreamLengthWrapper.cpp')
| -rw-r--r-- | xpcom/io/InputStreamLengthWrapper.cpp | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/xpcom/io/InputStreamLengthWrapper.cpp b/xpcom/io/InputStreamLengthWrapper.cpp new file mode 100644 index 0000000000..4014e90768 --- /dev/null +++ b/xpcom/io/InputStreamLengthWrapper.cpp @@ -0,0 +1,363 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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 "InputStreamLengthWrapper.h" +#include "mozilla/ipc/InputStreamUtils.h" +#include "nsISeekableStream.h" +#include "nsStreamUtils.h" + +namespace mozilla { + +using namespace ipc; + +NS_IMPL_ADDREF(InputStreamLengthWrapper); +NS_IMPL_RELEASE(InputStreamLengthWrapper); + +NS_INTERFACE_MAP_BEGIN(InputStreamLengthWrapper) + NS_INTERFACE_MAP_ENTRY(nsIInputStream) + NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICloneableInputStream, + mWeakCloneableInputStream || !mInputStream) + NS_INTERFACE_MAP_ENTRY_CONDITIONAL( + nsIIPCSerializableInputStream, + mWeakIPCSerializableInputStream || !mInputStream) + NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISeekableStream, + mWeakSeekableInputStream || !mInputStream) + NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsITellableStream, + mWeakTellableInputStream || !mInputStream) + NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStream, + mWeakAsyncInputStream || !mInputStream) + NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamCallback, + mWeakAsyncInputStream || !mInputStream) + NS_INTERFACE_MAP_ENTRY(nsIInputStreamLength) + NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInputStream) +NS_INTERFACE_MAP_END + +/* static */ +already_AddRefed<nsIInputStream> InputStreamLengthWrapper::MaybeWrap( + already_AddRefed<nsIInputStream> aInputStream, int64_t aLength) { + nsCOMPtr<nsIInputStream> inputStream = std::move(aInputStream); + MOZ_ASSERT(inputStream); + + nsCOMPtr<nsIInputStreamLength> length = do_QueryInterface(inputStream); + if (length) { + return inputStream.forget(); + } + + nsCOMPtr<nsIAsyncInputStreamLength> asyncLength = + do_QueryInterface(inputStream); + if (asyncLength) { + return inputStream.forget(); + } + + nsCOMPtr<nsIAsyncInputStream> asyncStream = do_QueryInterface(inputStream); + if (!asyncStream) { + return inputStream.forget(); + } + + inputStream = new InputStreamLengthWrapper(inputStream.forget(), aLength); + return inputStream.forget(); +} + +InputStreamLengthWrapper::InputStreamLengthWrapper( + already_AddRefed<nsIInputStream> aInputStream, int64_t aLength) + : mWeakCloneableInputStream(nullptr), + mWeakIPCSerializableInputStream(nullptr), + mWeakSeekableInputStream(nullptr), + mWeakTellableInputStream(nullptr), + mWeakAsyncInputStream(nullptr), + mLength(aLength), + mConsumed(false), + mMutex("InputStreamLengthWrapper::mMutex") { + MOZ_ASSERT(mLength >= 0); + + nsCOMPtr<nsIInputStream> inputStream = std::move(aInputStream); + SetSourceStream(inputStream.forget()); +} + +InputStreamLengthWrapper::InputStreamLengthWrapper() + : mWeakCloneableInputStream(nullptr), + mWeakIPCSerializableInputStream(nullptr), + mWeakSeekableInputStream(nullptr), + mWeakTellableInputStream(nullptr), + mWeakAsyncInputStream(nullptr), + mLength(-1), + mConsumed(false), + mMutex("InputStreamLengthWrapper::mMutex") {} + +InputStreamLengthWrapper::~InputStreamLengthWrapper() = default; + +void InputStreamLengthWrapper::SetSourceStream( + already_AddRefed<nsIInputStream> aInputStream) { + MOZ_ASSERT(!mInputStream); + + mInputStream = std::move(aInputStream); + + nsCOMPtr<nsICloneableInputStream> cloneableStream = + do_QueryInterface(mInputStream); + if (cloneableStream && SameCOMIdentity(mInputStream, cloneableStream)) { + mWeakCloneableInputStream = cloneableStream; + } + + nsCOMPtr<nsIIPCSerializableInputStream> serializableStream = + do_QueryInterface(mInputStream); + if (serializableStream && SameCOMIdentity(mInputStream, serializableStream)) { + mWeakIPCSerializableInputStream = serializableStream; + } + + nsCOMPtr<nsISeekableStream> seekableStream = do_QueryInterface(mInputStream); + if (seekableStream && SameCOMIdentity(mInputStream, seekableStream)) { + mWeakSeekableInputStream = seekableStream; + } + + nsCOMPtr<nsITellableStream> tellableStream = do_QueryInterface(mInputStream); + if (tellableStream && SameCOMIdentity(mInputStream, tellableStream)) { + mWeakTellableInputStream = tellableStream; + } + + nsCOMPtr<nsIAsyncInputStream> asyncInputStream = + do_QueryInterface(mInputStream); + if (asyncInputStream && SameCOMIdentity(mInputStream, asyncInputStream)) { + mWeakAsyncInputStream = asyncInputStream; + } +} + +// nsIInputStream interface + +NS_IMETHODIMP +InputStreamLengthWrapper::Close() { + NS_ENSURE_STATE(mInputStream); + return mInputStream->Close(); +} + +NS_IMETHODIMP +InputStreamLengthWrapper::Available(uint64_t* aLength) { + NS_ENSURE_STATE(mInputStream); + return mInputStream->Available(aLength); +} + +NS_IMETHODIMP +InputStreamLengthWrapper::Read(char* aBuffer, uint32_t aCount, + uint32_t* aReadCount) { + NS_ENSURE_STATE(mInputStream); + mConsumed = true; + return mInputStream->Read(aBuffer, aCount, aReadCount); +} + +NS_IMETHODIMP +InputStreamLengthWrapper::ReadSegments(nsWriteSegmentFun aWriter, + void* aClosure, uint32_t aCount, + uint32_t* aResult) { + return NS_ERROR_NOT_IMPLEMENTED; +} + +NS_IMETHODIMP +InputStreamLengthWrapper::IsNonBlocking(bool* aNonBlocking) { + NS_ENSURE_STATE(mInputStream); + return mInputStream->IsNonBlocking(aNonBlocking); +} + +// nsICloneableInputStream interface + +NS_IMETHODIMP +InputStreamLengthWrapper::GetCloneable(bool* aCloneable) { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakCloneableInputStream); + mWeakCloneableInputStream->GetCloneable(aCloneable); + return NS_OK; +} + +NS_IMETHODIMP +InputStreamLengthWrapper::Clone(nsIInputStream** aResult) { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakCloneableInputStream); + + nsCOMPtr<nsIInputStream> clonedStream; + nsresult rv = mWeakCloneableInputStream->Clone(getter_AddRefs(clonedStream)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + nsCOMPtr<nsIInputStream> stream = + new InputStreamLengthWrapper(clonedStream.forget(), mLength); + + stream.forget(aResult); + return NS_OK; +} + +// nsIAsyncInputStream interface + +NS_IMETHODIMP +InputStreamLengthWrapper::CloseWithStatus(nsresult aStatus) { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakAsyncInputStream); + + mConsumed = true; + return mWeakAsyncInputStream->CloseWithStatus(aStatus); +} + +NS_IMETHODIMP +InputStreamLengthWrapper::AsyncWait(nsIInputStreamCallback* aCallback, + uint32_t aFlags, uint32_t aRequestedCount, + nsIEventTarget* aEventTarget) { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakAsyncInputStream); + + nsCOMPtr<nsIInputStreamCallback> callback = this; + { + MutexAutoLock lock(mMutex); + + if (mAsyncWaitCallback && aCallback) { + return NS_ERROR_FAILURE; + } + + bool hadCallback = !!mAsyncWaitCallback; + mAsyncWaitCallback = aCallback; + + if (!mAsyncWaitCallback) { + if (!hadCallback) { + // No pending operation. + return NS_OK; + } + + // Abort current operation. + callback = nullptr; + } + } + + return mWeakAsyncInputStream->AsyncWait(callback, aFlags, aRequestedCount, + aEventTarget); +} + +// nsIInputStreamCallback + +NS_IMETHODIMP +InputStreamLengthWrapper::OnInputStreamReady(nsIAsyncInputStream* aStream) { + MOZ_ASSERT(mInputStream); + MOZ_ASSERT(mWeakAsyncInputStream); + MOZ_ASSERT(mWeakAsyncInputStream == aStream); + + nsCOMPtr<nsIInputStreamCallback> callback; + { + MutexAutoLock lock(mMutex); + // We have been canceled in the meanwhile. + if (!mAsyncWaitCallback) { + return NS_OK; + } + + callback.swap(mAsyncWaitCallback); + } + + MOZ_ASSERT(callback); + return callback->OnInputStreamReady(this); +} + +// nsIIPCSerializableInputStream + +void InputStreamLengthWrapper::Serialize( + mozilla::ipc::InputStreamParams& aParams, + FileDescriptorArray& aFileDescriptors, bool aDelayedStart, + uint32_t aMaxSize, uint32_t* aSizeUsed, + mozilla::ipc::ParentToChildStreamActorManager* aManager) { + SerializeInternal(aParams, aFileDescriptors, aDelayedStart, aMaxSize, + aSizeUsed, aManager); +} + +void InputStreamLengthWrapper::Serialize( + mozilla::ipc::InputStreamParams& aParams, + FileDescriptorArray& aFileDescriptors, bool aDelayedStart, + uint32_t aMaxSize, uint32_t* aSizeUsed, + mozilla::ipc::ChildToParentStreamActorManager* aManager) { + SerializeInternal(aParams, aFileDescriptors, aDelayedStart, aMaxSize, + aSizeUsed, aManager); +} + +template <typename M> +void InputStreamLengthWrapper::SerializeInternal( + mozilla::ipc::InputStreamParams& aParams, + FileDescriptorArray& aFileDescriptors, bool aDelayedStart, + uint32_t aMaxSize, uint32_t* aSizeUsed, M* aManager) { + MOZ_ASSERT(mInputStream); + MOZ_ASSERT(mWeakIPCSerializableInputStream); + + InputStreamLengthWrapperParams params; + InputStreamHelper::SerializeInputStream(mInputStream, params.stream(), + aFileDescriptors, aDelayedStart, + aMaxSize, aSizeUsed, aManager); + params.length() = mLength; + params.consumed() = mConsumed; + + aParams = params; +} + +bool InputStreamLengthWrapper::Deserialize( + const mozilla::ipc::InputStreamParams& aParams, + const FileDescriptorArray& aFileDescriptors) { + MOZ_ASSERT(!mInputStream); + MOZ_ASSERT(!mWeakIPCSerializableInputStream); + + if (aParams.type() != InputStreamParams::TInputStreamLengthWrapperParams) { + NS_ERROR("Received unknown parameters from the other process!"); + return false; + } + + const InputStreamLengthWrapperParams& params = + aParams.get_InputStreamLengthWrapperParams(); + + nsCOMPtr<nsIInputStream> stream = InputStreamHelper::DeserializeInputStream( + params.stream(), aFileDescriptors); + if (!stream) { + NS_WARNING("Deserialize failed!"); + return false; + } + + SetSourceStream(stream.forget()); + + mLength = params.length(); + mConsumed = params.consumed(); + + return true; +} + +// nsISeekableStream + +NS_IMETHODIMP +InputStreamLengthWrapper::Seek(int32_t aWhence, int64_t aOffset) { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakSeekableInputStream); + + mConsumed = true; + return mWeakSeekableInputStream->Seek(aWhence, aOffset); +} + +NS_IMETHODIMP +InputStreamLengthWrapper::SetEOF() { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakSeekableInputStream); + + mConsumed = true; + return mWeakSeekableInputStream->SetEOF(); +} + +// nsITellableStream + +NS_IMETHODIMP +InputStreamLengthWrapper::Tell(int64_t* aResult) { + NS_ENSURE_STATE(mInputStream); + NS_ENSURE_STATE(mWeakTellableInputStream); + + return mWeakTellableInputStream->Tell(aResult); +} + +// nsIInputStreamLength + +NS_IMETHODIMP +InputStreamLengthWrapper::Length(int64_t* aLength) { + NS_ENSURE_STATE(mInputStream); + *aLength = mLength; + return NS_OK; +} + +} // namespace mozilla |