mirror of
https://github.com/mozilla/gecko-dev.git
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334 lines
9.5 KiB
C++
334 lines
9.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@netscape.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdlib.h>
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#include "prlog.h"
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#include "nsIInputStreamTee.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsIEventTarget.h"
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#include "nsThreadUtils.h"
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#ifdef PR_LOGGING
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static PRLogModuleInfo* gInputStreamTeeLog = PR_NewLogModule("nsInputStreamTee");
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#define LOG(args) PR_LOG(gInputStreamTeeLog, PR_LOG_DEBUG, args)
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#else
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#define LOG(args)
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#endif
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class nsInputStreamTee : public nsIInputStreamTee
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIINPUTSTREAMTEE
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nsInputStreamTee();
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private:
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~nsInputStreamTee() {}
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nsresult TeeSegment(const char *buf, PRUint32 count);
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static NS_METHOD WriteSegmentFun(nsIInputStream *, void *, const char *,
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PRUint32, PRUint32, PRUint32 *);
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private:
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nsCOMPtr<nsIInputStream> mSource;
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nsCOMPtr<nsIOutputStream> mSink;
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nsCOMPtr<nsIEventTarget> mEventTarget;
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nsWriteSegmentFun mWriter; // for implementing ReadSegments
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void *mClosure; // for implementing ReadSegments
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};
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class nsInputStreamTeeWriteEvent : public nsRunnable {
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public:
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nsInputStreamTeeWriteEvent(const char *aBuf, PRUint32 aCount,
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nsIOutputStream *aSink)
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{
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// copy the buffer - will be free'd by dtor
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mBuf = (char *)malloc(aCount);
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if (mBuf) memcpy(mBuf, (char *)aBuf, aCount);
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mCount = aCount;
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mSink = aSink;
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PRBool isNonBlocking;
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mSink->IsNonBlocking(&isNonBlocking);
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NS_ASSERTION(isNonBlocking == PR_FALSE, "mSink is nonblocking");
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}
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NS_IMETHOD Run()
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{
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if (!mBuf) {
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NS_WARNING("nsInputStreamTeeWriteEvent::Run() "
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"memory not allocated\n");
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return NS_OK;
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}
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NS_ABORT_IF_FALSE(mSink, "mSink is null!");
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LOG(("nsInputStreamTeeWriteEvent::Run() [%p]"
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"will write %u bytes to %p\n",
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this, mCount, mSink.get()));
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PRUint32 totalBytesWritten = 0;
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while (mCount) {
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nsresult rv;
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PRUint32 bytesWritten = 0;
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rv = mSink->Write(mBuf + totalBytesWritten, mCount, &bytesWritten);
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if (NS_FAILED(rv)) {
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LOG(("nsInputStreamTeeWriteEvent::Run[%p] error %x in writing",
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this,rv));
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break;
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}
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totalBytesWritten += bytesWritten;
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NS_ASSERTION(bytesWritten <= mCount, "wrote too much");
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mCount -= bytesWritten;
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}
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return NS_OK;
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}
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protected:
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virtual ~nsInputStreamTeeWriteEvent()
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{
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if (mBuf) free(mBuf);
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mBuf = nsnull;
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}
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private:
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char *mBuf;
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PRUint32 mCount;
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nsCOMPtr<nsIOutputStream> mSink;
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};
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nsInputStreamTee::nsInputStreamTee()
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{
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}
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nsresult
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nsInputStreamTee::TeeSegment(const char *buf, PRUint32 count)
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{
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if (!mSink)
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return NS_OK; // nothing to do
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if (mEventTarget) {
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nsRefPtr<nsIRunnable> event =
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new nsInputStreamTeeWriteEvent(buf, count, mSink);
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NS_ENSURE_TRUE(event, NS_ERROR_OUT_OF_MEMORY);
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LOG(("nsInputStreamTee::TeeSegment [%p] dispatching write %u bytes\n",
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this, count));
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return mEventTarget->Dispatch(event, NS_DISPATCH_NORMAL);
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}
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nsresult rv;
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PRUint32 totalBytesWritten = 0;
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while (count) {
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PRUint32 bytesWritten = 0;
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rv = mSink->Write(buf + totalBytesWritten, count, &bytesWritten);
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if (NS_FAILED(rv)) {
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// ok, this is not a fatal error... just drop our reference to mSink
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// and continue on as if nothing happened.
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NS_WARNING("Write failed (non-fatal)");
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// catch possible misuse of the input stream tee
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NS_ASSERTION(rv != NS_BASE_STREAM_WOULD_BLOCK, "sink must be a blocking stream");
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mSink = 0;
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break;
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}
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totalBytesWritten += bytesWritten;
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NS_ASSERTION(bytesWritten <= count, "wrote too much");
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count -= bytesWritten;
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}
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return NS_OK;
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}
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NS_METHOD
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nsInputStreamTee::WriteSegmentFun(nsIInputStream *in, void *closure, const char *fromSegment,
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PRUint32 offset, PRUint32 count, PRUint32 *writeCount)
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{
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nsInputStreamTee *tee = reinterpret_cast<nsInputStreamTee *>(closure);
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nsresult rv = tee->mWriter(in, tee->mClosure, fromSegment, offset, count, writeCount);
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if (NS_FAILED(rv) || (*writeCount == 0)) {
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NS_ASSERTION((NS_FAILED(rv) ? (*writeCount == 0) : PR_TRUE),
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"writer returned an error with non-zero writeCount");
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return rv;
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}
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return tee->TeeSegment(fromSegment, *writeCount);
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}
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NS_IMPL_ISUPPORTS2(nsInputStreamTee,
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nsIInputStreamTee,
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nsIInputStream)
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NS_IMETHODIMP
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nsInputStreamTee::Close()
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{
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NS_ENSURE_TRUE(mSource, NS_ERROR_NOT_INITIALIZED);
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nsresult rv = mSource->Close();
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mSource = 0;
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mSink = 0;
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return rv;
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}
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NS_IMETHODIMP
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nsInputStreamTee::Available(PRUint32 *avail)
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{
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NS_ENSURE_TRUE(mSource, NS_ERROR_NOT_INITIALIZED);
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return mSource->Available(avail);
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}
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NS_IMETHODIMP
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nsInputStreamTee::Read(char *buf, PRUint32 count, PRUint32 *bytesRead)
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{
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NS_ENSURE_TRUE(mSource, NS_ERROR_NOT_INITIALIZED);
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nsresult rv = mSource->Read(buf, count, bytesRead);
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if (NS_FAILED(rv) || (*bytesRead == 0))
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return rv;
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return TeeSegment(buf, *bytesRead);
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}
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NS_IMETHODIMP
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nsInputStreamTee::ReadSegments(nsWriteSegmentFun writer,
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void *closure,
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PRUint32 count,
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PRUint32 *bytesRead)
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{
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NS_ENSURE_TRUE(mSource, NS_ERROR_NOT_INITIALIZED);
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mWriter = writer;
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mClosure = closure;
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return mSource->ReadSegments(WriteSegmentFun, this, count, bytesRead);
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}
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NS_IMETHODIMP
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nsInputStreamTee::IsNonBlocking(PRBool *result)
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{
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NS_ENSURE_TRUE(mSource, NS_ERROR_NOT_INITIALIZED);
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return mSource->IsNonBlocking(result);
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}
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NS_IMETHODIMP
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nsInputStreamTee::SetSource(nsIInputStream *source)
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{
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mSource = source;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::GetSource(nsIInputStream **source)
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{
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NS_IF_ADDREF(*source = mSource);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::SetSink(nsIOutputStream *sink)
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{
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#ifdef DEBUG
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if (sink) {
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PRBool nonBlocking;
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nsresult rv = sink->IsNonBlocking(&nonBlocking);
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if (NS_FAILED(rv) || nonBlocking)
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NS_ERROR("sink should be a blocking stream");
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}
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#endif
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mSink = sink;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::GetSink(nsIOutputStream **sink)
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{
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NS_IF_ADDREF(*sink = mSink);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::SetEventTarget(nsIEventTarget *anEventTarget)
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{
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mEventTarget = anEventTarget;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::GetEventTarget(nsIEventTarget **anEventTarget)
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{
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NS_IF_ADDREF(*anEventTarget = mEventTarget);
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return NS_OK;
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}
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NS_COM nsresult
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NS_NewInputStreamTeeAsync(nsIInputStream **result,
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nsIInputStream *source,
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nsIOutputStream *sink,
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nsIEventTarget *anEventTarget)
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{
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nsresult rv;
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nsCOMPtr<nsIInputStreamTee> tee;
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NS_NEWXPCOM(tee, nsInputStreamTee);
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if (!tee)
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return NS_ERROR_OUT_OF_MEMORY;
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rv = tee->SetSource(source);
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if (NS_FAILED(rv)) return rv;
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rv = tee->SetSink(sink);
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if (NS_FAILED(rv)) return rv;
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rv = tee->SetEventTarget(anEventTarget);
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if (NS_FAILED(rv)) return rv;
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NS_ADDREF(*result = tee);
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return rv;
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}
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NS_COM nsresult
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NS_NewInputStreamTee(nsIInputStream **result,
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nsIInputStream *source,
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nsIOutputStream *sink)
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{
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return NS_NewInputStreamTeeAsync(result, source, sink, nsnull);
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}
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