зеркало из https://github.com/mozilla/gecko-dev.git
123 строки
3.7 KiB
C++
123 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set sw=2 ts=8 et 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/. */
|
|
|
|
#ifndef _RemoteOpenFileChild_h
|
|
#define _RemoteOpenFileChild_h
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "mozilla/dom/TabChild.h"
|
|
#include "mozilla/net/PRemoteOpenFileChild.h"
|
|
#include "nsICachedFileDescriptorListener.h"
|
|
#include "nsILocalFile.h"
|
|
#include "nsIRemoteOpenFileListener.h"
|
|
|
|
class nsILoadContext;
|
|
|
|
namespace mozilla {
|
|
|
|
namespace ipc {
|
|
class FileDescriptor;
|
|
} // namespace ipc
|
|
|
|
namespace net {
|
|
|
|
/**
|
|
* RemoteOpenFileChild: a thin wrapper around regular nsIFile classes that does
|
|
* IPC to open a file handle on parent instead of child. Used when we can't
|
|
* open file handle on child (don't have permission), but we don't want the
|
|
* overhead of shipping all I/O traffic across IPDL. Example: JAR files.
|
|
*
|
|
* To open a file handle with this class, AsyncRemoteFileOpen() must be called
|
|
* first. After the listener's OnRemoteFileOpenComplete() is called, if the
|
|
* result is NS_OK, nsIFile.OpenNSPRFileDesc() may be called to get a
|
|
* duplicated file descriptor.
|
|
*
|
|
* Note that the file descriptor returned by NSPRFileDesc() is duplicated from
|
|
* the original, which shares its file offset with the original. If the file
|
|
* offset is modified (ex: by lseek/read/write) on one of the shared
|
|
* descriptors, the offset is also changed for the other. It can be safely
|
|
* used only with operations that take absolute offsets, such as
|
|
* mmap/pread/pwrite.
|
|
*
|
|
* This class should only be instantiated in a child process.
|
|
*
|
|
*/
|
|
class RemoteOpenFileChild final
|
|
: public PRemoteOpenFileChild
|
|
, public nsIFile
|
|
, public nsIHashable
|
|
, public nsICachedFileDescriptorListener
|
|
{
|
|
typedef mozilla::dom::TabChild TabChild;
|
|
typedef mozilla::ipc::FileDescriptor FileDescriptor;
|
|
|
|
virtual ~RemoteOpenFileChild();
|
|
|
|
public:
|
|
RemoteOpenFileChild()
|
|
: mNSPRFileDesc(nullptr)
|
|
, mAsyncOpenCalled(false)
|
|
, mNSPROpenCalled(false)
|
|
{}
|
|
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
NS_DECL_NSIFILE
|
|
NS_DECL_NSIHASHABLE
|
|
|
|
// aRemoteOpenUri must be scheme 'remoteopenfile://': otherwise looks like
|
|
// a file:// uri.
|
|
nsresult Init(nsIURI* aRemoteOpenUri, nsIURI* aAppUri);
|
|
|
|
// Send message to parent to tell it to open file handle for file.
|
|
// TabChild is required, for IPC security.
|
|
// Note: currently only PR_RDONLY is supported for 'flags'
|
|
nsresult AsyncRemoteFileOpen(int32_t aFlags,
|
|
nsIRemoteOpenFileListener* aListener,
|
|
nsITabChild* aTabChild,
|
|
nsILoadContext *aLoadContext);
|
|
|
|
nsresult SetNSPRFileDesc(PRFileDesc* aNSPRFileDesc);
|
|
|
|
void ReleaseIPDLReference()
|
|
{
|
|
Release();
|
|
}
|
|
|
|
private:
|
|
RemoteOpenFileChild(const RemoteOpenFileChild& other);
|
|
|
|
protected:
|
|
void AddIPDLReference()
|
|
{
|
|
AddRef();
|
|
}
|
|
|
|
virtual bool Recv__delete__(const FileDescriptor&) override;
|
|
|
|
virtual void OnCachedFileDescriptor(const nsAString& aPath,
|
|
const FileDescriptor& aFD) override;
|
|
|
|
void HandleFileDescriptorAndNotifyListener(const FileDescriptor&,
|
|
bool aFromRecvDelete);
|
|
|
|
void NotifyListener(nsresult aResult);
|
|
|
|
// regular nsIFile object, that we forward most calls to.
|
|
nsCOMPtr<nsIFile> mFile;
|
|
nsCOMPtr<nsIURI> mURI;
|
|
nsCOMPtr<nsIURI> mAppURI;
|
|
nsCOMPtr<nsIRemoteOpenFileListener> mListener;
|
|
RefPtr<TabChild> mTabChild;
|
|
PRFileDesc* mNSPRFileDesc;
|
|
bool mAsyncOpenCalled;
|
|
bool mNSPROpenCalled;
|
|
};
|
|
|
|
} // namespace net
|
|
} // namespace mozilla
|
|
|
|
#endif // _RemoteOpenFileChild_h
|