2006-01-02 02:30:32 +00:00
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:set ts=4 sts=4 sw=4 cin et: */
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/* ***** BEGIN LICENSE BLOCK *****
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2004-04-18 14:21:17 +00:00
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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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1999-11-16 19:14:08 +00:00
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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2004-04-18 14:21:17 +00:00
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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) 1998-1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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1999-11-30 23:36:32 +00:00
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* Pierre Phaneuf <pp@ludusdesign.com>
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2004-04-18 14:21:17 +00:00
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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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1999-11-16 19:14:08 +00:00
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/*
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* The storage stream provides an internal buffer that can be filled by a
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* client using a single output stream. One or more independent input streams
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* can be created to read the data out non-destructively. The implementation
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* uses a segmented buffer internally to avoid realloc'ing of large buffers,
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* with the attendant performance loss and heap fragmentation.
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*/
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#include "nsStorageStream.h"
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#include "nsSegmentedBuffer.h"
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2006-01-02 02:30:32 +00:00
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#include "nsStreamUtils.h"
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1999-11-16 19:14:08 +00:00
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#include "nsCOMPtr.h"
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#include "prbit.h"
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2000-08-22 07:03:33 +00:00
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#include "nsIInputStream.h"
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2002-01-25 02:13:00 +00:00
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#include "nsISeekableStream.h"
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2000-01-21 23:16:35 +00:00
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#include "prlog.h"
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2004-04-13 14:37:53 +00:00
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#include "nsInt64.h"
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2006-01-02 02:30:32 +00:00
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2000-01-21 23:16:35 +00:00
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#if defined(PR_LOGGING)
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//
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// Log module for StorageStream logging...
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//
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// To enable logging (see prlog.h for full details):
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//
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// set NSPR_LOG_MODULES=StorageStreamLog:5
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// set NSPR_LOG_FILE=nspr.log
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//
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// this enables PR_LOG_DEBUG level information and places all output in
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// the file nspr.log
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//
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2006-01-02 02:30:32 +00:00
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static PRLogModuleInfo* sLog = PR_NewLogModule("nsStorageStream");
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#endif
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#define LOG(args) PR_LOG(sLog, PR_LOG_DEBUG, args)
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2000-01-21 23:16:35 +00:00
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1999-11-16 19:14:08 +00:00
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nsStorageStream::nsStorageStream()
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1999-11-18 03:22:47 +00:00
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: mSegmentedBuffer(0), mSegmentSize(0), mWriteInProgress(PR_FALSE),
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1999-11-18 06:59:28 +00:00
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mLastSegmentNum(-1), mWriteCursor(0), mSegmentEnd(0), mLogicalLength(0)
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1999-11-16 19:14:08 +00:00
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{
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2006-01-02 02:30:32 +00:00
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LOG(("Creating nsStorageStream [%p].\n", this));
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1999-11-16 19:14:08 +00:00
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}
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nsStorageStream::~nsStorageStream()
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{
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2006-01-02 02:30:32 +00:00
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if (mSegmentedBuffer)
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delete mSegmentedBuffer;
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1999-11-16 19:14:08 +00:00
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}
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2000-03-05 21:26:01 +00:00
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NS_IMPL_THREADSAFE_ISUPPORTS2(nsStorageStream,
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nsIStorageStream,
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nsIOutputStream)
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1999-11-16 19:14:08 +00:00
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NS_IMETHODIMP
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nsStorageStream::Init(PRUint32 segmentSize, PRUint32 maxSize,
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2000-06-03 09:46:12 +00:00
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nsIMemory *segmentAllocator)
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1999-11-16 19:14:08 +00:00
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{
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mSegmentedBuffer = new nsSegmentedBuffer();
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if (!mSegmentedBuffer)
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return NS_ERROR_OUT_OF_MEMORY;
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mSegmentSize = segmentSize;
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mSegmentSizeLog2 = PR_FloorLog2(segmentSize);
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// Segment size must be a power of two
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if (mSegmentSize != ((PRUint32)1 << mSegmentSizeLog2))
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return NS_ERROR_INVALID_ARG;
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return mSegmentedBuffer->Init(segmentSize, maxSize, segmentAllocator);
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}
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NS_IMETHODIMP
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nsStorageStream::GetOutputStream(PRInt32 aStartingOffset,
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nsIOutputStream * *aOutputStream)
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{
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NS_ENSURE_ARG(aOutputStream);
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2005-04-20 15:37:38 +00:00
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NS_ENSURE_TRUE(mSegmentedBuffer, NS_ERROR_NOT_INITIALIZED);
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1999-11-16 19:14:08 +00:00
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if (mWriteInProgress)
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return NS_ERROR_NOT_AVAILABLE;
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nsresult rv = Seek(aStartingOffset);
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if (NS_FAILED(rv)) return rv;
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// Enlarge the last segment in the buffer so that it is the same size as
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// all the other segments in the buffer. (It may have been realloc'ed
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// smaller in the Close() method.)
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if (mLastSegmentNum >= 0)
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mSegmentedBuffer->ReallocLastSegment(mSegmentSize);
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1999-12-08 06:28:44 +00:00
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// Need to re-Seek, since realloc might have changed segment base pointer
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rv = Seek(aStartingOffset);
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if (NS_FAILED(rv)) return rv;
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1999-11-16 19:14:08 +00:00
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NS_ADDREF(this);
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*aOutputStream = NS_STATIC_CAST(nsIOutputStream*, this);
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1999-11-18 03:22:47 +00:00
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mWriteInProgress = PR_TRUE;
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1999-11-16 19:14:08 +00:00
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::Close()
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{
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2005-04-20 15:37:38 +00:00
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NS_ENSURE_TRUE(mSegmentedBuffer, NS_ERROR_NOT_INITIALIZED);
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1999-11-18 03:22:47 +00:00
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mWriteInProgress = PR_FALSE;
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1999-11-16 19:14:08 +00:00
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PRInt32 segmentOffset = SegOffset(mLogicalLength);
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// Shrink the final segment in the segmented buffer to the minimum size
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// needed to contain the data, so as to conserve memory.
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if (segmentOffset)
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mSegmentedBuffer->ReallocLastSegment(segmentOffset);
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mWriteCursor = 0;
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mSegmentEnd = 0;
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2006-01-02 02:30:32 +00:00
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LOG(("nsStorageStream [%p] Close mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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2000-01-21 23:16:35 +00:00
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1999-11-16 19:14:08 +00:00
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::Flush()
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::Write(const char *aBuffer, PRUint32 aCount, PRUint32 *aNumWritten)
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{
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2005-04-20 15:37:38 +00:00
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NS_ENSURE_TRUE(mSegmentedBuffer, NS_ERROR_NOT_INITIALIZED);
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1999-11-16 19:14:08 +00:00
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const char* readCursor;
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PRUint32 count, availableInSegment, remaining;
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nsresult rv = NS_OK;
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NS_ENSURE_ARG_POINTER(aNumWritten);
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NS_ENSURE_ARG(aBuffer);
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2006-01-02 02:30:32 +00:00
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LOG(("nsStorageStream [%p] Write mWriteCursor=%x mSegmentEnd=%x aCount=%d\n",
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this, mWriteCursor, mSegmentEnd, aCount));
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2000-01-21 23:16:35 +00:00
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1999-11-16 19:14:08 +00:00
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remaining = aCount;
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readCursor = aBuffer;
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while (remaining) {
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availableInSegment = mSegmentEnd - mWriteCursor;
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if (!availableInSegment) {
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mWriteCursor = mSegmentedBuffer->AppendNewSegment();
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if (!mWriteCursor) {
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2000-01-21 23:16:35 +00:00
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mSegmentEnd = 0;
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1999-11-16 19:14:08 +00:00
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto out;
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}
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2000-01-21 23:16:35 +00:00
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mLastSegmentNum++;
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1999-11-16 19:14:08 +00:00
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mSegmentEnd = mWriteCursor + mSegmentSize;
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availableInSegment = mSegmentEnd - mWriteCursor;
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2006-01-02 02:30:32 +00:00
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LOG(("nsStorageStream [%p] Write (new seg) mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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1999-11-16 19:14:08 +00:00
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}
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count = PR_MIN(availableInSegment, remaining);
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memcpy(mWriteCursor, readCursor, count);
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remaining -= count;
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readCursor += count;
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mWriteCursor += count;
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2006-01-02 02:30:32 +00:00
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LOG(("nsStorageStream [%p] Writing mWriteCursor=%x mSegmentEnd=%x count=%d\n",
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this, mWriteCursor, mSegmentEnd, count));
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1999-11-16 19:14:08 +00:00
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};
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out:
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*aNumWritten = aCount - remaining;
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mLogicalLength += *aNumWritten;
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2006-01-02 02:30:32 +00:00
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LOG(("nsStorageStream [%p] Wrote mWriteCursor=%x mSegmentEnd=%x numWritten=%d\n",
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this, mWriteCursor, mSegmentEnd, *aNumWritten));
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1999-11-16 19:14:08 +00:00
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return rv;
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}
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2000-08-22 07:03:33 +00:00
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NS_IMETHODIMP
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nsStorageStream::WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *_retval)
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{
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NS_NOTREACHED("WriteFrom");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsStorageStream::WriteSegments(nsReadSegmentFun reader, void * closure, PRUint32 count, PRUint32 *_retval)
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{
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NS_NOTREACHED("WriteSegments");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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2002-03-12 00:59:06 +00:00
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nsStorageStream::IsNonBlocking(PRBool *aNonBlocking)
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2000-08-22 07:03:33 +00:00
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{
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2002-03-12 00:59:06 +00:00
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*aNonBlocking = PR_TRUE;
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return NS_OK;
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2000-08-22 07:03:33 +00:00
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}
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1999-11-16 19:14:08 +00:00
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NS_IMETHODIMP
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nsStorageStream::GetLength(PRUint32 *aLength)
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{
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NS_ENSURE_ARG(aLength);
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*aLength = mLogicalLength;
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return NS_OK;
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}
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// Truncate the buffer by deleting the end segments
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NS_IMETHODIMP
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nsStorageStream::SetLength(PRUint32 aLength)
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{
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2005-04-20 15:37:38 +00:00
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NS_ENSURE_TRUE(mSegmentedBuffer, NS_ERROR_NOT_INITIALIZED);
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1999-11-16 19:14:08 +00:00
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if (mWriteInProgress)
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return NS_ERROR_NOT_AVAILABLE;
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if (aLength > mLogicalLength)
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return NS_ERROR_INVALID_ARG;
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PRInt32 newLastSegmentNum = SegNum(aLength);
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PRInt32 segmentOffset = SegOffset(aLength);
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if (segmentOffset == 0)
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newLastSegmentNum--;
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while (newLastSegmentNum < mLastSegmentNum) {
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mSegmentedBuffer->DeleteLastSegment();
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mLastSegmentNum--;
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}
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mLogicalLength = aLength;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::GetWriteInProgress(PRBool *aWriteInProgress)
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{
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NS_ENSURE_ARG(aWriteInProgress);
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*aWriteInProgress = mWriteInProgress;
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return NS_OK;
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}
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NS_METHOD
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nsStorageStream::Seek(PRInt32 aPosition)
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{
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2005-04-20 15:37:38 +00:00
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NS_ENSURE_TRUE(mSegmentedBuffer, NS_ERROR_NOT_INITIALIZED);
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1999-11-16 19:14:08 +00:00
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// An argument of -1 means "seek to end of stream"
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if (aPosition == -1)
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aPosition = mLogicalLength;
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// Seeking beyond the buffer end is illegal
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if ((PRUint32)aPosition > mLogicalLength)
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return NS_ERROR_INVALID_ARG;
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// Seeking backwards in the write stream results in truncation
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SetLength(aPosition);
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// Special handling for seek to start-of-buffer
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if (aPosition == 0) {
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mWriteCursor = 0;
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mSegmentEnd = 0;
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2006-01-02 02:30:32 +00:00
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LOG(("nsStorageStream [%p] Seek mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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1999-11-16 19:14:08 +00:00
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return NS_OK;
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}
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// Segment may have changed, so reset pointers
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mWriteCursor = mSegmentedBuffer->GetSegment(mLastSegmentNum);
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2000-01-21 23:16:35 +00:00
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NS_ASSERTION(mWriteCursor, "null mWriteCursor");
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1999-11-16 19:14:08 +00:00
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mSegmentEnd = mWriteCursor + mSegmentSize;
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2004-09-29 16:45:22 +00:00
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// Adjust write cursor for current segment offset. This test is necessary
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// because SegNum may reference the next-to-be-allocated segment, in which
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// case we need to be pointing at the end of the last segment.
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1999-11-16 19:14:08 +00:00
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PRInt32 segmentOffset = SegOffset(aPosition);
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2004-09-29 16:45:22 +00:00
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if (segmentOffset == 0 && (SegNum(aPosition) > (PRUint32) mLastSegmentNum))
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mWriteCursor = mSegmentEnd;
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else
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|
|
mWriteCursor += segmentOffset;
|
1999-11-16 19:14:08 +00:00
|
|
|
|
2006-01-02 02:30:32 +00:00
|
|
|
LOG(("nsStorageStream [%p] Seek mWriteCursor=%x mSegmentEnd=%x\n",
|
|
|
|
this, mWriteCursor, mSegmentEnd));
|
1999-11-16 19:14:08 +00:00
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
2000-01-21 23:16:35 +00:00
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
1999-11-16 19:14:08 +00:00
|
|
|
// There can be many nsStorageInputStreams for a single nsStorageStream
|
|
|
|
class nsStorageInputStream : public nsIInputStream
|
2002-01-25 02:13:00 +00:00
|
|
|
, public nsISeekableStream
|
1999-11-16 19:14:08 +00:00
|
|
|
{
|
|
|
|
public:
|
|
|
|
nsStorageInputStream(nsStorageStream *aStorageStream, PRUint32 aSegmentSize)
|
|
|
|
: mStorageStream(aStorageStream), mReadCursor(0),
|
1999-11-18 03:38:32 +00:00
|
|
|
mSegmentEnd(0), mSegmentNum(0),
|
2006-01-02 02:30:32 +00:00
|
|
|
mSegmentSize(aSegmentSize), mLogicalCursor(0),
|
|
|
|
mStatus(NS_OK)
|
1999-11-16 19:14:08 +00:00
|
|
|
{
|
|
|
|
NS_ADDREF(mStorageStream);
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_DECL_ISUPPORTS
|
|
|
|
NS_DECL_NSIINPUTSTREAM
|
2002-01-25 02:13:00 +00:00
|
|
|
NS_DECL_NSISEEKABLESTREAM
|
1999-11-16 19:14:08 +00:00
|
|
|
|
2004-01-15 06:14:18 +00:00
|
|
|
private:
|
|
|
|
~nsStorageInputStream()
|
|
|
|
{
|
|
|
|
NS_IF_RELEASE(mStorageStream);
|
|
|
|
}
|
|
|
|
|
1999-11-16 19:14:08 +00:00
|
|
|
protected:
|
|
|
|
NS_METHOD Seek(PRUint32 aPosition);
|
|
|
|
|
|
|
|
friend class nsStorageStream;
|
|
|
|
|
|
|
|
private:
|
1999-11-18 03:38:32 +00:00
|
|
|
nsStorageStream* mStorageStream;
|
1999-11-16 19:14:08 +00:00
|
|
|
const char* mReadCursor; // Next memory location to read byte, or NULL
|
|
|
|
const char* mSegmentEnd; // One byte past end of current buffer segment
|
|
|
|
PRUint32 mSegmentNum; // Segment number containing read cursor
|
|
|
|
PRUint32 mSegmentSize; // All segments, except the last, are of this size
|
|
|
|
PRUint32 mLogicalCursor; // Logical offset into stream
|
2006-01-02 02:30:32 +00:00
|
|
|
nsresult mStatus;
|
1999-11-16 19:14:08 +00:00
|
|
|
|
|
|
|
PRUint32 SegNum(PRUint32 aPosition) {return aPosition >> mStorageStream->mSegmentSizeLog2;}
|
|
|
|
PRUint32 SegOffset(PRUint32 aPosition) {return aPosition & (mSegmentSize - 1);}
|
|
|
|
};
|
|
|
|
|
2002-01-25 02:13:00 +00:00
|
|
|
NS_IMPL_THREADSAFE_ISUPPORTS2(nsStorageInputStream,
|
|
|
|
nsIInputStream,
|
|
|
|
nsISeekableStream)
|
1999-11-16 19:14:08 +00:00
|
|
|
|
|
|
|
NS_IMETHODIMP
|
|
|
|
nsStorageStream::NewInputStream(PRInt32 aStartingOffset, nsIInputStream* *aInputStream)
|
|
|
|
{
|
2005-04-20 15:37:38 +00:00
|
|
|
NS_ENSURE_TRUE(mSegmentedBuffer, NS_ERROR_NOT_INITIALIZED);
|
|
|
|
|
1999-11-16 19:14:08 +00:00
|
|
|
nsStorageInputStream *inputStream = new nsStorageInputStream(this, mSegmentSize);
|
|
|
|
if (!inputStream)
|
|
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
|
|
|
|
NS_ADDREF(inputStream);
|
|
|
|
|
2002-03-19 14:11:06 +00:00
|
|
|
nsresult rv = inputStream->Seek(aStartingOffset);
|
|
|
|
if (NS_FAILED(rv)) {
|
|
|
|
NS_RELEASE(inputStream);
|
|
|
|
return rv;
|
1999-11-16 19:14:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
*aInputStream = inputStream;
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
|
|
|
nsStorageInputStream::Close()
|
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
mStatus = NS_BASE_STREAM_CLOSED;
|
1999-11-16 19:14:08 +00:00
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
|
|
|
nsStorageInputStream::Available(PRUint32 *aAvailable)
|
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
if (NS_FAILED(mStatus))
|
|
|
|
return mStatus;
|
|
|
|
|
1999-11-16 19:14:08 +00:00
|
|
|
*aAvailable = mStorageStream->mLogicalLength - mLogicalCursor;
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
|
|
|
nsStorageInputStream::Read(char* aBuffer, PRUint32 aCount, PRUint32 *aNumRead)
|
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
return ReadSegments(NS_CopySegmentToBuffer, aBuffer, aCount, aNumRead);
|
1999-11-16 19:14:08 +00:00
|
|
|
}
|
|
|
|
|
2000-08-22 07:03:33 +00:00
|
|
|
NS_IMETHODIMP
|
2000-12-13 23:11:32 +00:00
|
|
|
nsStorageInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 aCount, PRUint32 *aNumRead)
|
2000-08-22 07:03:33 +00:00
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
if (mStatus == NS_BASE_STREAM_CLOSED) {
|
|
|
|
*aNumRead = 0;
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
if (NS_FAILED(mStatus))
|
|
|
|
return mStatus;
|
|
|
|
|
2000-12-13 23:11:32 +00:00
|
|
|
PRUint32 count, availableInSegment, remainingCapacity, bytesConsumed;
|
2003-01-09 21:37:30 +00:00
|
|
|
nsresult rv;
|
2000-12-13 23:11:32 +00:00
|
|
|
|
|
|
|
remainingCapacity = aCount;
|
|
|
|
while (remainingCapacity) {
|
|
|
|
availableInSegment = mSegmentEnd - mReadCursor;
|
|
|
|
if (!availableInSegment) {
|
|
|
|
PRUint32 available = mStorageStream->mLogicalLength - mLogicalCursor;
|
|
|
|
if (!available)
|
|
|
|
goto out;
|
2002-02-07 14:19:32 +00:00
|
|
|
|
2002-03-19 14:11:06 +00:00
|
|
|
mReadCursor = mStorageStream->mSegmentedBuffer->GetSegment(++mSegmentNum);
|
2000-12-13 23:11:32 +00:00
|
|
|
mSegmentEnd = mReadCursor + PR_MIN(mSegmentSize, available);
|
2002-02-07 14:19:32 +00:00
|
|
|
availableInSegment = mSegmentEnd - mReadCursor;
|
2000-12-13 23:11:32 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
count = PR_MIN(availableInSegment, remainingCapacity);
|
2006-01-02 02:30:32 +00:00
|
|
|
rv = writer(this, closure, mReadCursor, aCount - remainingCapacity,
|
|
|
|
count, &bytesConsumed);
|
2003-01-09 21:37:30 +00:00
|
|
|
if (NS_FAILED(rv) || (bytesConsumed == 0))
|
|
|
|
break;
|
2000-12-13 23:11:32 +00:00
|
|
|
remainingCapacity -= bytesConsumed;
|
|
|
|
mReadCursor += bytesConsumed;
|
|
|
|
mLogicalCursor += bytesConsumed;
|
|
|
|
};
|
|
|
|
|
|
|
|
out:
|
|
|
|
*aNumRead = aCount - remainingCapacity;
|
|
|
|
|
2002-02-25 18:49:16 +00:00
|
|
|
PRBool isWriteInProgress = PR_FALSE;
|
|
|
|
if (NS_FAILED(mStorageStream->GetWriteInProgress(&isWriteInProgress)))
|
|
|
|
isWriteInProgress = PR_FALSE;
|
|
|
|
|
|
|
|
if (*aNumRead == 0 && isWriteInProgress)
|
2006-01-02 02:30:32 +00:00
|
|
|
return NS_BASE_STREAM_WOULD_BLOCK;
|
|
|
|
|
|
|
|
return NS_OK;
|
2000-08-22 07:03:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
2002-03-12 00:59:06 +00:00
|
|
|
nsStorageInputStream::IsNonBlocking(PRBool *aNonBlocking)
|
2000-08-22 07:03:33 +00:00
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
// TODO: This class should implement nsIAsyncInputStream so that callers
|
|
|
|
// have some way of dealing with NS_BASE_STREAM_WOULD_BLOCK errors.
|
|
|
|
|
2002-03-12 00:59:06 +00:00
|
|
|
*aNonBlocking = PR_TRUE;
|
|
|
|
return NS_OK;
|
2000-08-22 07:03:33 +00:00
|
|
|
}
|
|
|
|
|
2002-01-25 02:13:00 +00:00
|
|
|
NS_IMETHODIMP
|
2004-04-13 14:37:53 +00:00
|
|
|
nsStorageInputStream::Seek(PRInt32 aWhence, PRInt64 aOffset)
|
2002-01-25 02:13:00 +00:00
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
if (NS_FAILED(mStatus))
|
|
|
|
return mStatus;
|
|
|
|
|
|
|
|
PRInt64 pos = aOffset;
|
2002-01-25 02:13:00 +00:00
|
|
|
|
|
|
|
switch (aWhence) {
|
|
|
|
case NS_SEEK_SET:
|
|
|
|
break;
|
|
|
|
case NS_SEEK_CUR:
|
2004-04-13 14:37:53 +00:00
|
|
|
pos += mLogicalCursor;
|
2002-01-25 02:13:00 +00:00
|
|
|
break;
|
|
|
|
case NS_SEEK_END:
|
2004-04-13 14:37:53 +00:00
|
|
|
pos += mStorageStream->mLogicalLength;
|
2002-01-25 02:13:00 +00:00
|
|
|
break;
|
2002-01-25 10:47:24 +00:00
|
|
|
default:
|
|
|
|
NS_NOTREACHED("unexpected whence value");
|
|
|
|
return NS_ERROR_UNEXPECTED;
|
2002-01-25 02:13:00 +00:00
|
|
|
}
|
2006-01-02 02:30:32 +00:00
|
|
|
if (pos == PRInt64(mLogicalCursor))
|
2003-01-18 02:15:14 +00:00
|
|
|
return NS_OK;
|
|
|
|
|
2002-01-25 02:13:00 +00:00
|
|
|
return Seek(pos);
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
2004-04-13 14:37:53 +00:00
|
|
|
nsStorageInputStream::Tell(PRInt64 *aResult)
|
2002-01-25 02:13:00 +00:00
|
|
|
{
|
2006-01-02 02:30:32 +00:00
|
|
|
if (NS_FAILED(mStatus))
|
|
|
|
return mStatus;
|
|
|
|
|
2004-04-13 14:37:53 +00:00
|
|
|
LL_UI2L(*aResult, mLogicalCursor);
|
2002-01-25 02:13:00 +00:00
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
|
|
|
nsStorageInputStream::SetEOF()
|
|
|
|
{
|
|
|
|
NS_NOTREACHED("nsStorageInputStream::SetEOF");
|
|
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
|
|
}
|
|
|
|
|
1999-11-16 19:14:08 +00:00
|
|
|
NS_METHOD
|
|
|
|
nsStorageInputStream::Seek(PRUint32 aPosition)
|
|
|
|
{
|
|
|
|
PRUint32 length = mStorageStream->mLogicalLength;
|
|
|
|
if (aPosition >= length)
|
|
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
|
|
|
|
mSegmentNum = SegNum(aPosition);
|
|
|
|
PRUint32 segmentOffset = SegOffset(aPosition);
|
|
|
|
mReadCursor = mStorageStream->mSegmentedBuffer->GetSegment(mSegmentNum) +
|
|
|
|
segmentOffset;
|
|
|
|
PRUint32 available = length - aPosition;
|
|
|
|
mSegmentEnd = mReadCursor + PR_MIN(mSegmentSize - segmentOffset, available);
|
|
|
|
mLogicalCursor = aPosition;
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_COM nsresult
|
|
|
|
NS_NewStorageStream(PRUint32 segmentSize, PRUint32 maxSize, nsIStorageStream **result)
|
|
|
|
{
|
|
|
|
NS_ENSURE_ARG(result);
|
|
|
|
|
|
|
|
nsStorageStream* storageStream = new nsStorageStream();
|
|
|
|
if (!storageStream) return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
|
|
|
|
NS_ADDREF(storageStream);
|
2004-06-18 09:03:10 +00:00
|
|
|
nsresult rv = storageStream->Init(segmentSize, maxSize, nsnull);
|
2004-03-02 01:13:15 +00:00
|
|
|
if (NS_FAILED(rv)) {
|
|
|
|
NS_RELEASE(storageStream);
|
|
|
|
return rv;
|
|
|
|
}
|
1999-11-16 19:14:08 +00:00
|
|
|
*result = storageStream;
|
|
|
|
return NS_OK;
|
|
|
|
}
|