mirror of
https://github.com/mozilla/gecko-dev.git
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179 lines
5.1 KiB
C++
179 lines
5.1 KiB
C++
/* 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 "InputStreamUtils.h"
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#include "nsIIPCSerializableInputStream.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/dom/ipc/Blob.h"
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#include "nsComponentManagerUtils.h"
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#include "nsDebug.h"
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#include "nsID.h"
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#include "nsIDOMFile.h"
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#include "nsIXULRuntime.h"
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#include "nsMIMEInputStream.h"
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#include "nsMultiplexInputStream.h"
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#include "nsNetCID.h"
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#include "nsStringStream.h"
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#include "nsThreadUtils.h"
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#include "nsXULAppAPI.h"
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using mozilla::dom::BlobChild;
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using mozilla::dom::BlobParent;
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namespace {
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NS_DEFINE_CID(kStringInputStreamCID, NS_STRINGINPUTSTREAM_CID);
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NS_DEFINE_CID(kFileInputStreamCID, NS_LOCALFILEINPUTSTREAM_CID);
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NS_DEFINE_CID(kPartialFileInputStreamCID, NS_PARTIALLOCALFILEINPUTSTREAM_CID);
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NS_DEFINE_CID(kBufferedInputStreamCID, NS_BUFFEREDINPUTSTREAM_CID);
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NS_DEFINE_CID(kMIMEInputStreamCID, NS_MIMEINPUTSTREAM_CID);
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NS_DEFINE_CID(kMultiplexInputStreamCID, NS_MULTIPLEXINPUTSTREAM_CID);
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} // anonymous namespace
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namespace mozilla {
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namespace ipc {
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void
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SerializeInputStream(nsIInputStream* aInputStream,
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InputStreamParams& aParams,
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nsTArray<FileDescriptor>& aFileDescriptors)
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(aInputStream);
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nsCOMPtr<nsIIPCSerializableInputStream> serializable =
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do_QueryInterface(aInputStream);
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if (!serializable) {
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MOZ_CRASH("Input stream is not serializable!");
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}
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serializable->Serialize(aParams, aFileDescriptors);
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if (aParams.type() == InputStreamParams::T__None) {
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MOZ_CRASH("Serialize failed!");
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}
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}
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void
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SerializeInputStream(nsIInputStream* aInputStream,
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OptionalInputStreamParams& aParams,
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nsTArray<FileDescriptor>& aFileDescriptors)
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (aInputStream) {
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InputStreamParams params;
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SerializeInputStream(aInputStream, params, aFileDescriptors);
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aParams = params;
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}
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else {
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aParams = mozilla::void_t();
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}
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}
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already_AddRefed<nsIInputStream>
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DeserializeInputStream(const InputStreamParams& aParams,
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const nsTArray<FileDescriptor>& aFileDescriptors)
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{
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MOZ_ASSERT(NS_IsMainThread());
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nsCOMPtr<nsIIPCSerializableInputStream> serializable;
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switch (aParams.type()) {
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case InputStreamParams::TStringInputStreamParams:
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serializable = do_CreateInstance(kStringInputStreamCID);
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break;
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case InputStreamParams::TFileInputStreamParams:
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serializable = do_CreateInstance(kFileInputStreamCID);
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break;
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case InputStreamParams::TPartialFileInputStreamParams:
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serializable = do_CreateInstance(kPartialFileInputStreamCID);
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break;
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case InputStreamParams::TBufferedInputStreamParams:
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serializable = do_CreateInstance(kBufferedInputStreamCID);
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break;
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case InputStreamParams::TMIMEInputStreamParams:
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serializable = do_CreateInstance(kMIMEInputStreamCID);
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break;
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case InputStreamParams::TMultiplexInputStreamParams:
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serializable = do_CreateInstance(kMultiplexInputStreamCID);
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break;
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// When the input stream already exists in this process, all we need to do
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// is retrieve the original instead of sending any data over the wire.
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case InputStreamParams::TRemoteInputStreamParams: {
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nsCOMPtr<nsIDOMBlob> domBlob;
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const RemoteInputStreamParams& params =
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aParams.get_RemoteInputStreamParams();
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domBlob = params.remoteBlobParent() ?
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static_cast<BlobParent*>(params.remoteBlobParent())->GetBlob() :
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static_cast<BlobChild*>(params.remoteBlobChild())->GetBlob();
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MOZ_ASSERT(domBlob, "Invalid blob contents");
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// If fetching the internal stream fails, we ignore it and return a
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// null stream.
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nsCOMPtr<nsIInputStream> stream;
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nsresult rv = domBlob->GetInternalStream(getter_AddRefs(stream));
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if (NS_FAILED(rv) || !stream) {
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NS_WARNING("Couldn't obtain a valid stream from the blob");
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}
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return stream.forget();
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}
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default:
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MOZ_ASSERT(false, "Unknown params!");
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return nullptr;
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}
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MOZ_ASSERT(serializable);
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if (!serializable->Deserialize(aParams, aFileDescriptors)) {
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MOZ_ASSERT(false, "Deserialize failed!");
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return nullptr;
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}
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nsCOMPtr<nsIInputStream> stream = do_QueryInterface(serializable);
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MOZ_ASSERT(stream);
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return stream.forget();
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}
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already_AddRefed<nsIInputStream>
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DeserializeInputStream(const OptionalInputStreamParams& aParams,
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const nsTArray<FileDescriptor>& aFileDescriptors)
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{
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MOZ_ASSERT(NS_IsMainThread());
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nsCOMPtr<nsIInputStream> stream;
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switch (aParams.type()) {
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case OptionalInputStreamParams::Tvoid_t:
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// Leave stream null.
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break;
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case OptionalInputStreamParams::TInputStreamParams:
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stream = DeserializeInputStream(aParams.get_InputStreamParams(),
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aFileDescriptors);
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break;
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default:
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MOZ_ASSERT(false, "Unknown params!");
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}
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return stream.forget();
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}
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} // namespace ipc
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} // namespace mozilla
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