gecko-dev/ipc/glue/InputStreamUtils.cpp

123 lines
3.8 KiB
C++

/* -*- 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 "InputStreamUtils.h"
#include "nsIIPCSerializableInputStream.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ipc/IPCBlobInputStream.h"
#include "mozilla/dom/ipc/IPCBlobInputStreamStorage.h"
#include "mozilla/SlicedInputStream.h"
#include "nsComponentManagerUtils.h"
#include "nsDebug.h"
#include "nsID.h"
#include "nsIXULRuntime.h"
#include "nsMIMEInputStream.h"
#include "nsMultiplexInputStream.h"
#include "nsNetCID.h"
#include "nsStringStream.h"
#include "nsXULAppAPI.h"
using namespace mozilla::dom;
namespace {
NS_DEFINE_CID(kStringInputStreamCID, NS_STRINGINPUTSTREAM_CID);
NS_DEFINE_CID(kFileInputStreamCID, NS_LOCALFILEINPUTSTREAM_CID);
NS_DEFINE_CID(kBufferedInputStreamCID, NS_BUFFEREDINPUTSTREAM_CID);
NS_DEFINE_CID(kMIMEInputStreamCID, NS_MIMEINPUTSTREAM_CID);
NS_DEFINE_CID(kMultiplexInputStreamCID, NS_MULTIPLEXINPUTSTREAM_CID);
} // namespace
namespace mozilla {
namespace ipc {
void
InputStreamHelper::SerializeInputStream(nsIInputStream* aInputStream,
InputStreamParams& aParams,
nsTArray<FileDescriptor>& aFileDescriptors)
{
MOZ_ASSERT(aInputStream);
nsCOMPtr<nsIIPCSerializableInputStream> serializable =
do_QueryInterface(aInputStream);
if (!serializable) {
MOZ_CRASH("Input stream is not serializable!");
}
serializable->Serialize(aParams, aFileDescriptors);
if (aParams.type() == InputStreamParams::T__None) {
MOZ_CRASH("Serialize failed!");
}
}
already_AddRefed<nsIInputStream>
InputStreamHelper::DeserializeInputStream(const InputStreamParams& aParams,
const nsTArray<FileDescriptor>& aFileDescriptors)
{
nsCOMPtr<nsIInputStream> stream;
nsCOMPtr<nsIIPCSerializableInputStream> serializable;
// IPCBlobInputStreams are not deserializable on the parent side.
if (aParams.type() == InputStreamParams::TIPCBlobInputStreamParams) {
MOZ_ASSERT(XRE_IsParentProcess());
IPCBlobInputStreamStorage::Get()->GetStream(aParams.get_IPCBlobInputStreamParams().id(),
aParams.get_IPCBlobInputStreamParams().start(),
aParams.get_IPCBlobInputStreamParams().length(),
getter_AddRefs(stream));
return stream.forget();
}
switch (aParams.type()) {
case InputStreamParams::TStringInputStreamParams:
serializable = do_CreateInstance(kStringInputStreamCID);
break;
case InputStreamParams::TFileInputStreamParams:
serializable = do_CreateInstance(kFileInputStreamCID);
break;
case InputStreamParams::TBufferedInputStreamParams:
serializable = do_CreateInstance(kBufferedInputStreamCID);
break;
case InputStreamParams::TMIMEInputStreamParams:
serializable = do_CreateInstance(kMIMEInputStreamCID);
break;
case InputStreamParams::TMultiplexInputStreamParams:
serializable = do_CreateInstance(kMultiplexInputStreamCID);
break;
case InputStreamParams::TSlicedInputStreamParams:
serializable = new mozilla::SlicedInputStream();
break;
default:
MOZ_ASSERT(false, "Unknown params!");
return nullptr;
}
MOZ_ASSERT(serializable);
if (!serializable->Deserialize(aParams, aFileDescriptors)) {
MOZ_ASSERT(false, "Deserialize failed!");
return nullptr;
}
stream = do_QueryInterface(serializable);
MOZ_ASSERT(stream);
return stream.forget();
}
} // namespace ipc
} // namespace mozilla