123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et tw=80 : */
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/* 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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#ifndef _RemoteOpenFileChild_h
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#define _RemoteOpenFileChild_h
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/TabChild.h"
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#include "mozilla/net/PRemoteOpenFileChild.h"
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#include "nsICachedFileDescriptorListener.h"
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#include "nsILocalFile.h"
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#include "nsIRemoteOpenFileListener.h"
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class nsILoadContext;
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namespace mozilla {
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namespace ipc {
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class FileDescriptor;
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} // namespace ipc
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namespace net {
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/**
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* RemoteOpenFileChild: a thin wrapper around regular nsIFile classes that does
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* IPC to open a file handle on parent instead of child. Used when we can't
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* open file handle on child (don't have permission), but we don't want the
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* overhead of shipping all I/O traffic across IPDL. Example: JAR files.
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*
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* To open a file handle with this class, AsyncRemoteFileOpen() must be called
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* first. After the listener's OnRemoteFileOpenComplete() is called, if the
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* result is NS_OK, nsIFile.OpenNSPRFileDesc() may be called to get a
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* duplicated file descriptor.
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*
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* Note that the file descriptor returned by NSPRFileDesc() is duplicated from
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* the original, which shares its file offset with the original. If the file
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* offset is modified (ex: by lseek/read/write) on one of the shared
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* descriptors, the offset is also changed for the other. It can be safely
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* used only with operations that take absolute offsets, such as
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* mmap/pread/pwrite.
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*
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* This class should only be instantiated in a child process.
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*
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*/
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class RemoteOpenFileChild final
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: public PRemoteOpenFileChild
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, public nsIFile
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, public nsIHashable
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, public nsICachedFileDescriptorListener
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{
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typedef mozilla::dom::TabChild TabChild;
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typedef mozilla::ipc::FileDescriptor FileDescriptor;
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virtual ~RemoteOpenFileChild();
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public:
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RemoteOpenFileChild()
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: mNSPRFileDesc(nullptr)
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, mAsyncOpenCalled(false)
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, mNSPROpenCalled(false)
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{}
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIFILE
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NS_DECL_NSIHASHABLE
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// aRemoteOpenUri must be scheme 'remoteopenfile://': otherwise looks like
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// a file:// uri.
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nsresult Init(nsIURI* aRemoteOpenUri, nsIURI* aAppUri);
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// Send message to parent to tell it to open file handle for file.
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// TabChild is required, for IPC security.
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// Note: currently only PR_RDONLY is supported for 'flags'
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nsresult AsyncRemoteFileOpen(int32_t aFlags,
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nsIRemoteOpenFileListener* aListener,
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nsITabChild* aTabChild,
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nsILoadContext *aLoadContext);
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nsresult SetNSPRFileDesc(PRFileDesc* aNSPRFileDesc);
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void ReleaseIPDLReference()
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{
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Release();
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}
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private:
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RemoteOpenFileChild(const RemoteOpenFileChild& other);
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protected:
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void AddIPDLReference()
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{
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AddRef();
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}
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virtual bool Recv__delete__(const FileDescriptor&) override;
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virtual void OnCachedFileDescriptor(const nsAString& aPath,
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const FileDescriptor& aFD) override;
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void HandleFileDescriptorAndNotifyListener(const FileDescriptor&,
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bool aFromRecvDelete);
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void NotifyListener(nsresult aResult);
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// regular nsIFile object, that we forward most calls to.
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nsCOMPtr<nsIFile> mFile;
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nsCOMPtr<nsIURI> mURI;
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nsCOMPtr<nsIURI> mAppURI;
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nsCOMPtr<nsIRemoteOpenFileListener> mListener;
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RefPtr<TabChild> mTabChild;
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PRFileDesc* mNSPRFileDesc;
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bool mAsyncOpenCalled;
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bool mNSPROpenCalled;
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};
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} // namespace net
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} // namespace mozilla
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#endif // _RemoteOpenFileChild_h
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