mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-26 14:22:01 +00:00
914 lines
25 KiB
C++
914 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 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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#include "mozilla/Mutex.h"
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#include "mozilla/Attributes.h"
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#include "nsStreamUtils.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsIPipe.h"
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#include "nsICloneableInputStream.h"
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#include "nsIEventTarget.h"
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#include "nsIRunnable.h"
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#include "nsISafeOutputStream.h"
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#include "nsString.h"
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#include "nsIAsyncInputStream.h"
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#include "nsIAsyncOutputStream.h"
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#include "nsIBufferedStreams.h"
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#include "nsNetCID.h"
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#include "nsServiceManagerUtils.h"
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using namespace mozilla;
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//-----------------------------------------------------------------------------
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class nsInputStreamReadyEvent final
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: public nsIRunnable
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, public nsIInputStreamCallback
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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nsInputStreamReadyEvent(nsIInputStreamCallback* aCallback,
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nsIEventTarget* aTarget)
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: mCallback(aCallback)
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, mTarget(aTarget)
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{
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}
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private:
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~nsInputStreamReadyEvent()
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{
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if (!mCallback) {
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return;
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}
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//
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// whoa!! looks like we never posted this event. take care to
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// release mCallback on the correct thread. if mTarget lives on the
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// calling thread, then we are ok. otherwise, we have to try to
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// proxy the Release over the right thread. if that thread is dead,
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// then there's nothing we can do... better to leak than crash.
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//
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bool val;
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nsresult rv = mTarget->IsOnCurrentThread(&val);
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if (NS_FAILED(rv) || !val) {
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nsCOMPtr<nsIInputStreamCallback> event =
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NS_NewInputStreamReadyEvent(mCallback, mTarget);
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mCallback = nullptr;
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if (event) {
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rv = event->OnInputStreamReady(nullptr);
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if (NS_FAILED(rv)) {
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NS_NOTREACHED("leaking stream event");
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nsISupports* sup = event;
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NS_ADDREF(sup);
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}
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}
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}
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}
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public:
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NS_IMETHOD OnInputStreamReady(nsIAsyncInputStream* aStream) override
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{
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mStream = aStream;
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nsresult rv =
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mTarget->Dispatch(this, NS_DISPATCH_NORMAL);
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if (NS_FAILED(rv)) {
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NS_WARNING("Dispatch failed");
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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NS_IMETHOD Run() override
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{
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if (mCallback) {
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if (mStream) {
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mCallback->OnInputStreamReady(mStream);
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}
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mCallback = nullptr;
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}
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return NS_OK;
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}
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private:
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nsCOMPtr<nsIAsyncInputStream> mStream;
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nsCOMPtr<nsIInputStreamCallback> mCallback;
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nsCOMPtr<nsIEventTarget> mTarget;
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};
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NS_IMPL_ISUPPORTS(nsInputStreamReadyEvent, nsIRunnable,
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nsIInputStreamCallback)
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//-----------------------------------------------------------------------------
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class nsOutputStreamReadyEvent final
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: public nsIRunnable
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, public nsIOutputStreamCallback
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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nsOutputStreamReadyEvent(nsIOutputStreamCallback* aCallback,
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nsIEventTarget* aTarget)
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: mCallback(aCallback)
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, mTarget(aTarget)
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{
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}
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private:
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~nsOutputStreamReadyEvent()
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{
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if (!mCallback) {
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return;
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}
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//
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// whoa!! looks like we never posted this event. take care to
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// release mCallback on the correct thread. if mTarget lives on the
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// calling thread, then we are ok. otherwise, we have to try to
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// proxy the Release over the right thread. if that thread is dead,
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// then there's nothing we can do... better to leak than crash.
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//
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bool val;
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nsresult rv = mTarget->IsOnCurrentThread(&val);
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if (NS_FAILED(rv) || !val) {
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nsCOMPtr<nsIOutputStreamCallback> event =
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NS_NewOutputStreamReadyEvent(mCallback, mTarget);
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mCallback = nullptr;
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if (event) {
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rv = event->OnOutputStreamReady(nullptr);
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if (NS_FAILED(rv)) {
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NS_NOTREACHED("leaking stream event");
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nsISupports* sup = event;
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NS_ADDREF(sup);
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}
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}
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}
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}
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public:
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NS_IMETHOD OnOutputStreamReady(nsIAsyncOutputStream* aStream) override
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{
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mStream = aStream;
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nsresult rv =
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mTarget->Dispatch(this, NS_DISPATCH_NORMAL);
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if (NS_FAILED(rv)) {
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NS_WARNING("PostEvent failed");
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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NS_IMETHOD Run() override
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{
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if (mCallback) {
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if (mStream) {
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mCallback->OnOutputStreamReady(mStream);
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}
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mCallback = nullptr;
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}
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return NS_OK;
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}
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private:
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nsCOMPtr<nsIAsyncOutputStream> mStream;
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nsCOMPtr<nsIOutputStreamCallback> mCallback;
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nsCOMPtr<nsIEventTarget> mTarget;
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};
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NS_IMPL_ISUPPORTS(nsOutputStreamReadyEvent, nsIRunnable,
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nsIOutputStreamCallback)
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//-----------------------------------------------------------------------------
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already_AddRefed<nsIInputStreamCallback>
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NS_NewInputStreamReadyEvent(nsIInputStreamCallback* aCallback,
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nsIEventTarget* aTarget)
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{
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NS_ASSERTION(aCallback, "null callback");
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NS_ASSERTION(aTarget, "null target");
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nsRefPtr<nsInputStreamReadyEvent> ev =
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new nsInputStreamReadyEvent(aCallback, aTarget);
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return ev.forget();
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}
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already_AddRefed<nsIOutputStreamCallback>
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NS_NewOutputStreamReadyEvent(nsIOutputStreamCallback* aCallback,
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nsIEventTarget* aTarget)
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{
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NS_ASSERTION(aCallback, "null callback");
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NS_ASSERTION(aTarget, "null target");
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nsRefPtr<nsOutputStreamReadyEvent> ev =
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new nsOutputStreamReadyEvent(aCallback, aTarget);
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return ev.forget();
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}
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//-----------------------------------------------------------------------------
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// NS_AsyncCopy implementation
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// abstract stream copier...
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class nsAStreamCopier
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: public nsIInputStreamCallback
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, public nsIOutputStreamCallback
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, public nsIRunnable
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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nsAStreamCopier()
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: mLock("nsAStreamCopier.mLock")
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, mCallback(nullptr)
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, mProgressCallback(nullptr)
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, mClosure(nullptr)
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, mChunkSize(0)
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, mEventInProcess(false)
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, mEventIsPending(false)
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, mCloseSource(true)
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, mCloseSink(true)
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, mCanceled(false)
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, mCancelStatus(NS_OK)
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{
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}
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// kick off the async copy...
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nsresult Start(nsIInputStream* aSource,
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nsIOutputStream* aSink,
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nsIEventTarget* aTarget,
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nsAsyncCopyCallbackFun aCallback,
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void* aClosure,
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uint32_t aChunksize,
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bool aCloseSource,
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bool aCloseSink,
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nsAsyncCopyProgressFun aProgressCallback)
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{
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mSource = aSource;
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mSink = aSink;
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mTarget = aTarget;
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mCallback = aCallback;
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mClosure = aClosure;
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mChunkSize = aChunksize;
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mCloseSource = aCloseSource;
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mCloseSink = aCloseSink;
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mProgressCallback = aProgressCallback;
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mAsyncSource = do_QueryInterface(mSource);
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mAsyncSink = do_QueryInterface(mSink);
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return PostContinuationEvent();
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}
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// implemented by subclasses, returns number of bytes copied and
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// sets source and sink condition before returning.
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virtual uint32_t DoCopy(nsresult* aSourceCondition,
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nsresult* aSinkCondition) = 0;
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void Process()
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{
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if (!mSource || !mSink) {
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return;
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}
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nsresult cancelStatus;
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bool canceled;
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{
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MutexAutoLock lock(mLock);
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canceled = mCanceled;
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cancelStatus = mCancelStatus;
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}
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// If the copy was canceled before Process() was even called, then
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// sourceCondition and sinkCondition should be set to error results to
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// ensure we don't call Finish() on a canceled nsISafeOutputStream.
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MOZ_ASSERT(NS_FAILED(cancelStatus) == canceled, "cancel needs an error");
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nsresult sourceCondition = cancelStatus;
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nsresult sinkCondition = cancelStatus;
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// Copy data from the source to the sink until we hit failure or have
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// copied all the data.
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for (;;) {
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// Note: copyFailed will be true if the source or the sink have
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// reported an error, or if we failed to write any bytes
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// because we have consumed all of our data.
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bool copyFailed = false;
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if (!canceled) {
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uint32_t n = DoCopy(&sourceCondition, &sinkCondition);
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if (n > 0 && mProgressCallback) {
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mProgressCallback(mClosure, n);
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}
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copyFailed = NS_FAILED(sourceCondition) ||
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NS_FAILED(sinkCondition) || n == 0;
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MutexAutoLock lock(mLock);
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canceled = mCanceled;
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cancelStatus = mCancelStatus;
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}
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if (copyFailed && !canceled) {
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if (sourceCondition == NS_BASE_STREAM_WOULD_BLOCK && mAsyncSource) {
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// need to wait for more data from source. while waiting for
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// more source data, be sure to observe failures on output end.
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mAsyncSource->AsyncWait(this, 0, 0, nullptr);
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if (mAsyncSink)
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mAsyncSink->AsyncWait(this,
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nsIAsyncOutputStream::WAIT_CLOSURE_ONLY,
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0, nullptr);
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break;
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} else if (sinkCondition == NS_BASE_STREAM_WOULD_BLOCK && mAsyncSink) {
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// need to wait for more room in the sink. while waiting for
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// more room in the sink, be sure to observer failures on the
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// input end.
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mAsyncSink->AsyncWait(this, 0, 0, nullptr);
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if (mAsyncSource)
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mAsyncSource->AsyncWait(this,
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nsIAsyncInputStream::WAIT_CLOSURE_ONLY,
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0, nullptr);
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break;
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}
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}
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if (copyFailed || canceled) {
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if (mCloseSource) {
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// close source
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if (mAsyncSource)
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mAsyncSource->CloseWithStatus(
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canceled ? cancelStatus : sinkCondition);
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else {
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mSource->Close();
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}
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}
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mAsyncSource = nullptr;
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mSource = nullptr;
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if (mCloseSink) {
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// close sink
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if (mAsyncSink)
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mAsyncSink->CloseWithStatus(
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canceled ? cancelStatus : sourceCondition);
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else {
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// If we have an nsISafeOutputStream, and our
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// sourceCondition and sinkCondition are not set to a
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// failure state, finish writing.
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nsCOMPtr<nsISafeOutputStream> sostream =
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do_QueryInterface(mSink);
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if (sostream && NS_SUCCEEDED(sourceCondition) &&
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NS_SUCCEEDED(sinkCondition)) {
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sostream->Finish();
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} else {
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mSink->Close();
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}
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}
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}
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mAsyncSink = nullptr;
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mSink = nullptr;
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// notify state complete...
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if (mCallback) {
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nsresult status;
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if (!canceled) {
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status = sourceCondition;
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if (NS_SUCCEEDED(status)) {
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status = sinkCondition;
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}
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if (status == NS_BASE_STREAM_CLOSED) {
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status = NS_OK;
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}
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} else {
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status = cancelStatus;
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}
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mCallback(mClosure, status);
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}
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break;
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}
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}
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}
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nsresult Cancel(nsresult aReason)
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{
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MutexAutoLock lock(mLock);
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if (mCanceled) {
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return NS_ERROR_FAILURE;
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}
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if (NS_SUCCEEDED(aReason)) {
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NS_WARNING("cancel with non-failure status code");
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aReason = NS_BASE_STREAM_CLOSED;
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}
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mCanceled = true;
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mCancelStatus = aReason;
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return NS_OK;
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}
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NS_IMETHOD OnInputStreamReady(nsIAsyncInputStream* aSource) override
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{
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PostContinuationEvent();
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return NS_OK;
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}
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NS_IMETHOD OnOutputStreamReady(nsIAsyncOutputStream* aSink) override
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{
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PostContinuationEvent();
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return NS_OK;
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}
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// continuation event handler
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NS_IMETHOD Run() override
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{
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Process();
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// clear "in process" flag and post any pending continuation event
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MutexAutoLock lock(mLock);
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mEventInProcess = false;
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if (mEventIsPending) {
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mEventIsPending = false;
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PostContinuationEvent_Locked();
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}
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return NS_OK;
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}
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nsresult PostContinuationEvent()
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{
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// we cannot post a continuation event if there is currently
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// an event in process. doing so could result in Process being
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// run simultaneously on multiple threads, so we mark the event
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// as pending, and if an event is already in process then we
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// just let that existing event take care of posting the real
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// continuation event.
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MutexAutoLock lock(mLock);
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return PostContinuationEvent_Locked();
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}
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nsresult PostContinuationEvent_Locked()
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{
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nsresult rv = NS_OK;
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if (mEventInProcess) {
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mEventIsPending = true;
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} else {
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rv = mTarget->Dispatch(this, NS_DISPATCH_NORMAL);
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if (NS_SUCCEEDED(rv)) {
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mEventInProcess = true;
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} else {
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NS_WARNING("unable to post continuation event");
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}
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}
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return rv;
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}
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protected:
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nsCOMPtr<nsIInputStream> mSource;
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nsCOMPtr<nsIOutputStream> mSink;
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nsCOMPtr<nsIAsyncInputStream> mAsyncSource;
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nsCOMPtr<nsIAsyncOutputStream> mAsyncSink;
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nsCOMPtr<nsIEventTarget> mTarget;
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Mutex mLock;
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nsAsyncCopyCallbackFun mCallback;
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nsAsyncCopyProgressFun mProgressCallback;
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void* mClosure;
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uint32_t mChunkSize;
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bool mEventInProcess;
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bool mEventIsPending;
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bool mCloseSource;
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bool mCloseSink;
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bool mCanceled;
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nsresult mCancelStatus;
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// virtual since subclasses call superclass Release()
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virtual ~nsAStreamCopier()
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{
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}
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};
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NS_IMPL_ISUPPORTS(nsAStreamCopier,
|
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nsIInputStreamCallback,
|
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nsIOutputStreamCallback,
|
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nsIRunnable)
|
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|
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class nsStreamCopierIB final : public nsAStreamCopier
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{
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public:
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nsStreamCopierIB() : nsAStreamCopier()
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{
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}
|
|
virtual ~nsStreamCopierIB()
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{
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}
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|
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struct MOZ_STACK_CLASS ReadSegmentsState
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{
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// the nsIOutputStream will outlive the ReadSegmentsState on the stack
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nsIOutputStream* MOZ_NON_OWNING_REF mSink;
|
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nsresult mSinkCondition;
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};
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|
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static NS_METHOD ConsumeInputBuffer(nsIInputStream* aInStr,
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|
void* aClosure,
|
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const char* aBuffer,
|
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uint32_t aOffset,
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uint32_t aCount,
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uint32_t* aCountWritten)
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{
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ReadSegmentsState* state = (ReadSegmentsState*)aClosure;
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nsresult rv = state->mSink->Write(aBuffer, aCount, aCountWritten);
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if (NS_FAILED(rv)) {
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state->mSinkCondition = rv;
|
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} else if (*aCountWritten == 0) {
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state->mSinkCondition = NS_BASE_STREAM_CLOSED;
|
|
}
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|
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return state->mSinkCondition;
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}
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|
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uint32_t DoCopy(nsresult* aSourceCondition, nsresult* aSinkCondition)
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{
|
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ReadSegmentsState state;
|
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state.mSink = mSink;
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state.mSinkCondition = NS_OK;
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|
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uint32_t n;
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*aSourceCondition =
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mSource->ReadSegments(ConsumeInputBuffer, &state, mChunkSize, &n);
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*aSinkCondition = state.mSinkCondition;
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return n;
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}
|
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};
|
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|
|
class nsStreamCopierOB final : public nsAStreamCopier
|
|
{
|
|
public:
|
|
nsStreamCopierOB() : nsAStreamCopier()
|
|
{
|
|
}
|
|
virtual ~nsStreamCopierOB()
|
|
{
|
|
}
|
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|
|
struct MOZ_STACK_CLASS WriteSegmentsState
|
|
{
|
|
// the nsIInputStream will outlive the WriteSegmentsState on the stack
|
|
nsIInputStream* MOZ_NON_OWNING_REF mSource;
|
|
nsresult mSourceCondition;
|
|
};
|
|
|
|
static NS_METHOD FillOutputBuffer(nsIOutputStream* aOutStr,
|
|
void* aClosure,
|
|
char* aBuffer,
|
|
uint32_t aOffset,
|
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uint32_t aCount,
|
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uint32_t* aCountRead)
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|
{
|
|
WriteSegmentsState* state = (WriteSegmentsState*)aClosure;
|
|
|
|
nsresult rv = state->mSource->Read(aBuffer, aCount, aCountRead);
|
|
if (NS_FAILED(rv)) {
|
|
state->mSourceCondition = rv;
|
|
} else if (*aCountRead == 0) {
|
|
state->mSourceCondition = NS_BASE_STREAM_CLOSED;
|
|
}
|
|
|
|
return state->mSourceCondition;
|
|
}
|
|
|
|
uint32_t DoCopy(nsresult* aSourceCondition, nsresult* aSinkCondition)
|
|
{
|
|
WriteSegmentsState state;
|
|
state.mSource = mSource;
|
|
state.mSourceCondition = NS_OK;
|
|
|
|
uint32_t n;
|
|
*aSinkCondition =
|
|
mSink->WriteSegments(FillOutputBuffer, &state, mChunkSize, &n);
|
|
*aSourceCondition = state.mSourceCondition;
|
|
return n;
|
|
}
|
|
};
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
nsresult
|
|
NS_AsyncCopy(nsIInputStream* aSource,
|
|
nsIOutputStream* aSink,
|
|
nsIEventTarget* aTarget,
|
|
nsAsyncCopyMode aMode,
|
|
uint32_t aChunkSize,
|
|
nsAsyncCopyCallbackFun aCallback,
|
|
void* aClosure,
|
|
bool aCloseSource,
|
|
bool aCloseSink,
|
|
nsISupports** aCopierCtx,
|
|
nsAsyncCopyProgressFun aProgressCallback)
|
|
{
|
|
NS_ASSERTION(aTarget, "non-null target required");
|
|
|
|
nsresult rv;
|
|
nsAStreamCopier* copier;
|
|
|
|
if (aMode == NS_ASYNCCOPY_VIA_READSEGMENTS) {
|
|
copier = new nsStreamCopierIB();
|
|
} else {
|
|
copier = new nsStreamCopierOB();
|
|
}
|
|
|
|
// Start() takes an owning ref to the copier...
|
|
NS_ADDREF(copier);
|
|
rv = copier->Start(aSource, aSink, aTarget, aCallback, aClosure, aChunkSize,
|
|
aCloseSource, aCloseSink, aProgressCallback);
|
|
|
|
if (aCopierCtx) {
|
|
*aCopierCtx = static_cast<nsISupports*>(static_cast<nsIRunnable*>(copier));
|
|
NS_ADDREF(*aCopierCtx);
|
|
}
|
|
NS_RELEASE(copier);
|
|
|
|
return rv;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
nsresult
|
|
NS_CancelAsyncCopy(nsISupports* aCopierCtx, nsresult aReason)
|
|
{
|
|
nsAStreamCopier* copier =
|
|
static_cast<nsAStreamCopier*>(static_cast<nsIRunnable *>(aCopierCtx));
|
|
return copier->Cancel(aReason);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
nsresult
|
|
NS_ConsumeStream(nsIInputStream* aStream, uint32_t aMaxCount,
|
|
nsACString& aResult)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
aResult.Truncate();
|
|
|
|
while (aMaxCount) {
|
|
uint64_t avail64;
|
|
rv = aStream->Available(&avail64);
|
|
if (NS_FAILED(rv)) {
|
|
if (rv == NS_BASE_STREAM_CLOSED) {
|
|
rv = NS_OK;
|
|
}
|
|
break;
|
|
}
|
|
if (avail64 == 0) {
|
|
break;
|
|
}
|
|
|
|
uint32_t avail = (uint32_t)XPCOM_MIN<uint64_t>(avail64, aMaxCount);
|
|
|
|
// resize aResult buffer
|
|
uint32_t length = aResult.Length();
|
|
if (avail > UINT32_MAX - length) {
|
|
return NS_ERROR_FILE_TOO_BIG;
|
|
}
|
|
|
|
aResult.SetLength(length + avail);
|
|
if (aResult.Length() != (length + avail)) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
char* buf = aResult.BeginWriting() + length;
|
|
|
|
uint32_t n;
|
|
rv = aStream->Read(buf, avail, &n);
|
|
if (NS_FAILED(rv)) {
|
|
break;
|
|
}
|
|
if (n != avail) {
|
|
aResult.SetLength(length + n);
|
|
}
|
|
if (n == 0) {
|
|
break;
|
|
}
|
|
aMaxCount -= n;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
static NS_METHOD
|
|
TestInputStream(nsIInputStream* aInStr,
|
|
void* aClosure,
|
|
const char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountWritten)
|
|
{
|
|
bool* result = static_cast<bool*>(aClosure);
|
|
*result = true;
|
|
return NS_ERROR_ABORT; // don't call me anymore
|
|
}
|
|
|
|
bool
|
|
NS_InputStreamIsBuffered(nsIInputStream* aStream)
|
|
{
|
|
nsCOMPtr<nsIBufferedInputStream> bufferedIn = do_QueryInterface(aStream);
|
|
if (bufferedIn) {
|
|
return true;
|
|
}
|
|
|
|
bool result = false;
|
|
uint32_t n;
|
|
nsresult rv = aStream->ReadSegments(TestInputStream, &result, 1, &n);
|
|
return result || NS_SUCCEEDED(rv);
|
|
}
|
|
|
|
static NS_METHOD
|
|
TestOutputStream(nsIOutputStream* aOutStr,
|
|
void* aClosure,
|
|
char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountRead)
|
|
{
|
|
bool* result = static_cast<bool*>(aClosure);
|
|
*result = true;
|
|
return NS_ERROR_ABORT; // don't call me anymore
|
|
}
|
|
|
|
bool
|
|
NS_OutputStreamIsBuffered(nsIOutputStream* aStream)
|
|
{
|
|
nsCOMPtr<nsIBufferedOutputStream> bufferedOut = do_QueryInterface(aStream);
|
|
if (bufferedOut) {
|
|
return true;
|
|
}
|
|
|
|
bool result = false;
|
|
uint32_t n;
|
|
aStream->WriteSegments(TestOutputStream, &result, 1, &n);
|
|
return result;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
NS_METHOD
|
|
NS_CopySegmentToStream(nsIInputStream* aInStr,
|
|
void* aClosure,
|
|
const char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountWritten)
|
|
{
|
|
nsIOutputStream* outStr = static_cast<nsIOutputStream*>(aClosure);
|
|
*aCountWritten = 0;
|
|
while (aCount) {
|
|
uint32_t n;
|
|
nsresult rv = outStr->Write(aBuffer, aCount, &n);
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
aBuffer += n;
|
|
aCount -= n;
|
|
*aCountWritten += n;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_METHOD
|
|
NS_CopySegmentToBuffer(nsIInputStream* aInStr,
|
|
void* aClosure,
|
|
const char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountWritten)
|
|
{
|
|
char* toBuf = static_cast<char*>(aClosure);
|
|
memcpy(&toBuf[aOffset], aBuffer, aCount);
|
|
*aCountWritten = aCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_METHOD
|
|
NS_CopySegmentToBuffer(nsIOutputStream* aOutStr,
|
|
void* aClosure,
|
|
char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountRead)
|
|
{
|
|
const char* fromBuf = static_cast<const char*>(aClosure);
|
|
memcpy(aBuffer, &fromBuf[aOffset], aCount);
|
|
*aCountRead = aCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_METHOD
|
|
NS_DiscardSegment(nsIInputStream* aInStr,
|
|
void* aClosure,
|
|
const char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountWritten)
|
|
{
|
|
*aCountWritten = aCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
NS_METHOD
|
|
NS_WriteSegmentThunk(nsIInputStream* aInStr,
|
|
void* aClosure,
|
|
const char* aBuffer,
|
|
uint32_t aOffset,
|
|
uint32_t aCount,
|
|
uint32_t* aCountWritten)
|
|
{
|
|
nsWriteSegmentThunk* thunk = static_cast<nsWriteSegmentThunk*>(aClosure);
|
|
return thunk->mFun(thunk->mStream, thunk->mClosure, aBuffer, aOffset, aCount,
|
|
aCountWritten);
|
|
}
|
|
|
|
NS_METHOD
|
|
NS_FillArray(FallibleTArray<char>& aDest, nsIInputStream* aInput,
|
|
uint32_t aKeep, uint32_t* aNewBytes)
|
|
{
|
|
MOZ_ASSERT(aInput, "null stream");
|
|
MOZ_ASSERT(aKeep <= aDest.Length(), "illegal keep count");
|
|
|
|
char* aBuffer = aDest.Elements();
|
|
int64_t keepOffset = int64_t(aDest.Length()) - aKeep;
|
|
if (aKeep != 0 && keepOffset > 0) {
|
|
memmove(aBuffer, aBuffer + keepOffset, aKeep);
|
|
}
|
|
|
|
nsresult rv =
|
|
aInput->Read(aBuffer + aKeep, aDest.Capacity() - aKeep, aNewBytes);
|
|
if (NS_FAILED(rv)) {
|
|
*aNewBytes = 0;
|
|
}
|
|
// NOTE: we rely on the fact that the new slots are NOT initialized by
|
|
// SetLengthAndRetainStorage here, see nsTArrayElementTraits::Construct()
|
|
// in nsTArray.h:
|
|
aDest.SetLengthAndRetainStorage(aKeep + *aNewBytes);
|
|
|
|
MOZ_ASSERT(aDest.Length() <= aDest.Capacity(), "buffer overflow");
|
|
return rv;
|
|
}
|
|
|
|
nsresult
|
|
NS_CloneInputStream(nsIInputStream* aSource, nsIInputStream** aCloneOut,
|
|
nsIInputStream** aReplacementOut)
|
|
{
|
|
if (NS_WARN_IF(!aSource)) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// Attempt to perform the clone directly on the source stream
|
|
nsCOMPtr<nsICloneableInputStream> cloneable = do_QueryInterface(aSource);
|
|
if (cloneable && cloneable->GetCloneable()) {
|
|
if (aReplacementOut) {
|
|
*aReplacementOut = nullptr;
|
|
}
|
|
return cloneable->Clone(aCloneOut);
|
|
}
|
|
|
|
// If we failed the clone and the caller does not want to replace their
|
|
// original stream, then we are done. Return error.
|
|
if (!aReplacementOut) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// The caller has opted-in to the fallback clone support that replaces
|
|
// the original stream. Copy the data to a pipe and return two cloned
|
|
// input streams.
|
|
|
|
nsCOMPtr<nsIInputStream> reader;
|
|
nsCOMPtr<nsIInputStream> readerClone;
|
|
nsCOMPtr<nsIOutputStream> writer;
|
|
|
|
nsresult rv = NS_NewPipe(getter_AddRefs(reader), getter_AddRefs(writer),
|
|
0, 0, // default segment size and max size
|
|
true, true); // non-blocking
|
|
if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
|
|
|
|
cloneable = do_QueryInterface(reader);
|
|
MOZ_ASSERT(cloneable && cloneable->GetCloneable());
|
|
|
|
rv = cloneable->Clone(getter_AddRefs(readerClone));
|
|
if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
|
|
|
|
nsCOMPtr<nsIEventTarget> target =
|
|
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
|
|
|
|
rv = NS_AsyncCopy(aSource, writer, target, NS_ASYNCCOPY_VIA_WRITESEGMENTS);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
|
|
|
|
readerClone.forget(aCloneOut);
|
|
reader.forget(aReplacementOut);
|
|
|
|
return NS_OK;
|
|
}
|