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gecko-dev/xpcom_obsolete/nsIFileStream.cpp
dougt%netscape.com 89bcfadd00 first draft of a xpcom obsolete dir. NOT PART OF BUILD
2003-03-10 20:56:23 +00:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsIFileStream.h"
#include "nsFileSpec.h"
#include "nsCOMPtr.h"
#include "prerror.h"
#include "nsSegmentedBuffer.h"
#ifdef XP_MAC
#include "pprio.h" // To get PR_ImportFile
#else
#include "prio.h"
#endif
#ifdef XP_MAC
#include <Errors.h>
#include <iostream>
#endif
//========================================================================================
class FileImpl
: public nsIRandomAccessStore
, public nsIFileSpecOutputStream
, public nsIFileSpecInputStream
, public nsIOpenFile
//========================================================================================
{
public:
FileImpl(PRFileDesc* inDesc);
FileImpl(const nsFileSpec& inFile, int nsprMode, PRIntn accessMode);
virtual ~FileImpl();
// nsISupports interface
NS_DECL_ISUPPORTS
// nsIOpenFile interface
NS_IMETHOD Open(const nsFileSpec& inFile, int nsprMode, PRIntn accessMode);
NS_IMETHOD Close();
NS_IMETHOD GetIsOpen(PRBool* outOpen);
// nsIInputStream interface
NS_IMETHOD Available(PRUint32 *aLength);
NS_IMETHOD Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount);
NS_IMETHOD ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval);
NS_IMETHOD IsNonBlocking(PRBool *aNonBlocking);
// nsIOutputStream interface
NS_IMETHOD Write(const char* aBuf, PRUint32 aCount, PRUint32 *aWriteCount);
NS_IMETHOD Flush();
NS_IMETHOD WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *_retval);
NS_IMETHOD WriteSegments(nsReadSegmentFun reader, void * closure, PRUint32 count, PRUint32 *_retval);
// nsIRandomAccessStore interface
NS_DECL_NSISEEKABLESTREAM
NS_IMETHOD GetAtEOF(PRBool* outAtEOF);
NS_IMETHOD SetAtEOF(PRBool inAtEOF);
protected:
enum {
kOuputBufferSegmentSize = 4096,
kOuputBufferMaxSize = 4096
};
nsresult InternalFlush(PRBool syncFile);
nsresult AllocateBuffers(PRUint32 segmentSize, PRUint32 maxSize);
PRFileDesc* mFileDesc;
int mNSPRMode;
PRBool mFailed;
PRBool mEOF;
PRInt32 mLength;
PRBool mGotBuffers;
nsSegmentedBuffer mOutBuffer;
char* mWriteCursor;
char* mWriteLimit;
}; // class FileImpl
NS_IMPL_RELEASE(FileImpl)
NS_IMPL_ADDREF(FileImpl)
NS_IMPL_QUERY_HEAD(FileImpl)
NS_IMPL_QUERY_BODY(nsIOpenFile)
NS_IMPL_QUERY_BODY(nsISeekableStream)
NS_IMPL_QUERY_BODY(nsIRandomAccessStore)
NS_IMPL_QUERY_BODY(nsIOutputStream)
NS_IMPL_QUERY_BODY(nsIInputStream)
NS_IMPL_QUERY_BODY(nsIFileSpecInputStream)
NS_IMPL_QUERY_BODY(nsIFileSpecOutputStream)
NS_IMPL_QUERY_TAIL(nsIOutputStream)
//----------------------------------------------------------------------------------------
FileImpl::FileImpl(PRFileDesc* inDesc)
//----------------------------------------------------------------------------------------
: mFileDesc(inDesc)
, mNSPRMode(0)
, mFailed(PR_FALSE)
, mEOF(PR_FALSE)
, mLength(-1)
, mGotBuffers(PR_FALSE)
{
mWriteCursor = nsnull;
mWriteLimit = nsnull;
}
//----------------------------------------------------------------------------------------
FileImpl::FileImpl(const nsFileSpec& inFile, int nsprMode, PRIntn accessMode)
//----------------------------------------------------------------------------------------
: mFileDesc(nsnull)
, mNSPRMode(-1)
, mEOF(PR_FALSE)
, mLength(-1)
, mGotBuffers(PR_FALSE)
{
mWriteCursor = nsnull;
mWriteLimit = nsnull;
nsresult rv = Open(inFile, nsprMode, accessMode); // this sets nsprMode
if (NS_FAILED(rv))
{
mFailed = PR_TRUE;
#if DEBUG
char *fileName = inFile.GetLeafName();
printf("Opening file %s failed\n", fileName);
nsCRT::free(fileName);
#endif
}
else
{
mFailed = PR_FALSE;
}
}
//----------------------------------------------------------------------------------------
FileImpl::~FileImpl()
//----------------------------------------------------------------------------------------
{
nsresult rv = Close();
NS_ASSERTION(NS_SUCCEEDED(rv), "Close failed");
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Open(
const nsFileSpec& inFile,
int nsprMode,
PRIntn accessMode)
//----------------------------------------------------------------------------------------
{
if (mFileDesc)
if ((nsprMode & mNSPRMode) == nsprMode)
return NS_OK;
else
return NS_FILE_RESULT(PR_ILLEGAL_ACCESS_ERROR);
const int nspr_modes[]={
PR_WRONLY | PR_CREATE_FILE,
PR_WRONLY | PR_CREATE_FILE | PR_APPEND,
PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
PR_RDONLY,
PR_RDONLY | PR_APPEND,
PR_RDWR | PR_CREATE_FILE,
PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE,
// "wb",
// "ab",
// "wb",
// "rb",
// "r+b",
// "w+b",
0 };
const int* currentLegalMode = nspr_modes;
while (*currentLegalMode && nsprMode != *currentLegalMode)
++currentLegalMode;
if (!*currentLegalMode)
return NS_FILE_RESULT(PR_ILLEGAL_ACCESS_ERROR);
#ifdef XP_MAC
// Use the file spec to open the file, because one path can be common to
// several files on the Macintosh (you can have several volumes with the
// same name, see).
mFileDesc = 0;
OSErr err = inFile.Error();
if (err != noErr)
if (err != fnfErr || !(nsprMode & PR_CREATE_FILE))
return NS_FILE_RESULT(inFile.Error());
err = noErr;
#if DEBUG
const OSType kCreator = 'CWIE';
#else
const OSType kCreator = 'MOSS';
#endif
// Resolve the alias to the original file.
nsFileSpec original = inFile;
PRBool ignoredResult;
original.ResolveSymlink(ignoredResult);
const FSSpec& spec = original.operator const FSSpec&();
if (nsprMode & PR_CREATE_FILE) {
// In order to get the right file type/creator, do it with an nsILocalFileMac
// Don't propagate any errors in doing this. If any error, just use FSpCreate.
FSSpec nonConstSpec = spec;
nsCOMPtr<nsILocalFileMac> macFile;
nsresult res = NS_NewLocalFileWithFSSpec(&nonConstSpec, PR_FALSE, getter_AddRefs(macFile));
if (NS_SUCCEEDED(res)) {
nsCOMPtr<nsIFile> asFile(do_QueryInterface(macFile, &res));
if (NS_SUCCEEDED(res)) {
res = asFile->Create(nsIFile::NORMAL_FILE_TYPE, 0);
if (res == NS_ERROR_FILE_ALREADY_EXISTS)
res = NS_OK;
}
}
if (NS_FAILED(res))
err = FSpCreate(&spec, kCreator, 'TEXT', 0);
}
if (err == dupFNErr)
err = noErr;
if (err != noErr)
return NS_FILE_RESULT(err);
SInt8 perm;
if (nsprMode & PR_RDWR)
perm = fsRdWrPerm;
else if (nsprMode & PR_WRONLY)
perm = fsWrPerm;
else
perm = fsRdPerm;
short refnum;
err = FSpOpenDF(&spec, perm, &refnum);
if (err == noErr && (nsprMode & PR_TRUNCATE))
err = ::SetEOF(refnum, 0);
if (err == noErr && (nsprMode & PR_APPEND))
err = SetFPos(refnum, fsFromLEOF, 0);
if (err != noErr)
return NS_FILE_RESULT(err);
if ((mFileDesc = PR_ImportFile(refnum)) == 0)
return NS_FILE_RESULT(PR_GetError());
#else
// Platforms other than Macintosh...
// Another bug in NSPR: Mac PR_Open assumes a unix style path, but Win PR_Open assumes
// a windows path.
if ((mFileDesc = PR_Open((const char*)nsFileSpec(inFile), nsprMode, accessMode)) == 0)
return NS_FILE_RESULT(PR_GetError());
#endif
mNSPRMode = nsprMode;
mLength = PR_Available(mFileDesc);
return NS_OK;
} // FileImpl::Open
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Available(PRUint32 *aLength)
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aLength != nsnull, "null ptr");
if (!aLength)
return NS_ERROR_NULL_POINTER;
if (mLength < 0)
return NS_ERROR_UNEXPECTED;
*aLength = mLength;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::GetIsOpen(PRBool* outOpen)
//----------------------------------------------------------------------------------------
{
*outOpen = (mFileDesc != nsnull && !mFailed);
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Seek(PRInt32 whence, PRInt32 offset)
//----------------------------------------------------------------------------------------
{
if (mFileDesc==PR_STDIN || mFileDesc==PR_STDOUT || mFileDesc==PR_STDERR || !mFileDesc)
return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
mFailed = PR_FALSE; // reset on a seek.
mEOF = PR_FALSE; // reset on a seek.
// To avoid corruption, we flush during a seek. see bug number 18949
InternalFlush(PR_FALSE);
PRInt32 position = PR_Seek(mFileDesc, 0, PR_SEEK_CUR);
PRInt32 available = PR_Available(mFileDesc);
PRInt32 fileSize = position + available;
PRInt32 newPosition = 0;
switch (whence)
{
case NS_SEEK_CUR: newPosition = position + offset; break;
case NS_SEEK_SET: newPosition = offset; break;
case NS_SEEK_END: newPosition = fileSize + offset; break;
}
if (newPosition < 0)
{
newPosition = 0;
mFailed = PR_TRUE;
}
if (newPosition >= fileSize) // nb: not "else if".
{
newPosition = fileSize;
mEOF = PR_TRUE;
}
if (PR_Seek(mFileDesc, newPosition, PR_SEEK_SET) < 0)
mFailed = PR_TRUE;
return NS_OK;
} // FileImpl::Seek
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount)
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aBuf != nsnull, "null ptr");
if (!aBuf)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aReadCount != nsnull, "null ptr");
if (!aReadCount)
return NS_ERROR_NULL_POINTER;
if (!mFileDesc)
return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
if (mFailed)
return NS_ERROR_FAILURE;
PRInt32 bytesRead = PR_Read(mFileDesc, aBuf, aCount);
if (bytesRead < 0)
{
*aReadCount = 0;
mFailed = PR_TRUE;
return NS_FILE_RESULT(PR_GetError());
}
else if (bytesRead == 0)
{
mEOF = PR_TRUE;
}
*aReadCount = bytesRead;
return NS_OK;
}
NS_IMETHODIMP
FileImpl::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval)
{
NS_NOTREACHED("ReadSegments");
return NS_ERROR_NOT_IMPLEMENTED;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Write(const char* aBuf, PRUint32 aCount, PRUint32 *aWriteCount)
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aBuf != nsnull, "null ptr");
NS_PRECONDITION(aWriteCount != nsnull, "null ptr");
*aWriteCount = 0;
#ifdef XP_MAC
// Calling PR_Write on stdout is sure suicide.
if (mFileDesc == PR_STDOUT || mFileDesc == PR_STDERR)
{
std::cout.write(aBuf, aCount);
*aWriteCount = aCount;
return NS_OK;
}
#endif
if (!mFileDesc)
return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
if (mFailed)
return NS_ERROR_FAILURE;
if (!mGotBuffers)
{
nsresult rv = AllocateBuffers(kOuputBufferSegmentSize, kOuputBufferMaxSize);
if (NS_FAILED(rv))
return rv; // try to write non-buffered?
}
PRUint32 bufOffset = 0;
PRUint32 currentWrite = 0;
while (aCount > 0)
{
if (mWriteCursor == nsnull || mWriteCursor == mWriteLimit)
{
char* seg = mOutBuffer.AppendNewSegment();
if (seg == nsnull)
{
// buffer is full, try again
InternalFlush(PR_FALSE);
seg = mOutBuffer.AppendNewSegment();
if (seg == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
}
mWriteCursor = seg;
mWriteLimit = seg + mOutBuffer.GetSegmentSize();
}
// move
currentWrite = mWriteLimit - mWriteCursor;
if (aCount < currentWrite)
currentWrite = aCount;
memcpy(mWriteCursor, (aBuf + bufOffset), currentWrite);
mWriteCursor += currentWrite;
aCount -= currentWrite;
bufOffset += currentWrite;
*aWriteCount += currentWrite;
}
return NS_OK;
}
static NS_METHOD
nsWriteSegmentToFile(nsIInputStream* in,
void* closure,
const char* fromRawSegment,
PRUint32 toOffset,
PRUint32 count,
PRUint32 *writeCount)
{
NS_NOTREACHED("nsWriteSegmentToFile");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
FileImpl::WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *result)
{
return inStr->ReadSegments(nsWriteSegmentToFile, nsnull, count, result);
}
NS_IMETHODIMP
FileImpl::WriteSegments(nsReadSegmentFun reader, void * closure,
PRUint32 count, PRUint32 *result)
{
NS_NOTREACHED("WriteSegments");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
FileImpl::IsNonBlocking(PRBool *aNonBlocking)
{
*aNonBlocking = PR_FALSE;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Tell(PRUint32* outWhere)
//----------------------------------------------------------------------------------------
{
if (mFileDesc==PR_STDIN || mFileDesc==PR_STDOUT || mFileDesc==PR_STDERR || !mFileDesc)
return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
*outWhere = PR_Seek(mFileDesc, 0, PR_SEEK_CUR);
return NS_OK;
} // FileImpl::Tell
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Close()
//----------------------------------------------------------------------------------------
{
if ((mNSPRMode & PR_RDONLY) == 0)
InternalFlush(PR_FALSE);
if (mFileDesc==PR_STDIN || mFileDesc==PR_STDOUT || mFileDesc==PR_STDERR || !mFileDesc)
return NS_OK;
if (PR_Close(mFileDesc) == PR_SUCCESS)
mFileDesc = 0;
else
return NS_FILE_RESULT(PR_GetError());
return NS_OK;
} // FileImpl::close
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::Flush()
//----------------------------------------------------------------------------------------
{
// for external callers, this will do a Sync as well as flush buffers.
return InternalFlush(PR_TRUE);
} // FileImpl::flush
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::GetAtEOF(PRBool* outAtEOF)
//----------------------------------------------------------------------------------------
{
*outAtEOF = mEOF;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::SetAtEOF(PRBool inAtEOF)
//----------------------------------------------------------------------------------------
{
mEOF = inAtEOF;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP FileImpl::SetEOF()
//----------------------------------------------------------------------------------------
{
NS_NOTYETIMPLEMENTED("FileImpl::SetEOF");
return NS_ERROR_NOT_IMPLEMENTED;
}
//----------------------------------------------------------------------------------------
nsresult FileImpl::AllocateBuffers(PRUint32 segmentSize, PRUint32 maxBufSize)
//----------------------------------------------------------------------------------------
{
nsresult rv = mOutBuffer.Init(segmentSize, maxBufSize);
if (NS_SUCCEEDED(rv))
mGotBuffers = PR_TRUE;
return rv;
}
// external callers of Flush will have sync get called,
// but internal callers just want to flush the buffers to disk.
nsresult FileImpl::InternalFlush(PRBool syncFile)
{
#ifdef XP_MAC
if (mFileDesc == PR_STDOUT || mFileDesc == PR_STDERR)
{
std::cout.flush();
return NS_OK;
}
#endif
if (!mFileDesc)
return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
PRInt32 segCount = mOutBuffer.GetSegmentCount();
PRUint32 segSize = mOutBuffer.GetSegmentSize();
for (PRInt32 i = 0; i < segCount; i++)
{
char* seg = mOutBuffer.GetSegment(i);
// if it is the last buffer, it may not be completely full.
if(i == (segCount-1))
segSize = (mWriteCursor - seg);
PRInt32 bytesWrit = PR_Write(mFileDesc, seg, segSize);
if (bytesWrit != (PRInt32)segSize)
{
mFailed = PR_TRUE;
return NS_FILE_RESULT(PR_GetError());
}
}
if (mGotBuffers)
mOutBuffer.Empty();
mWriteCursor = nsnull;
mWriteLimit = nsnull;
// On unix, it seems to fail always.
if (syncFile && PR_Sync(mFileDesc) != PR_SUCCESS)
mFailed = PR_TRUE;
return NS_OK;
}
//----------------------------------------------------------------------------------------
nsresult NS_NewTypicalInputFileStream(
nsISupports** aResult,
const nsFileSpec& inFile
/*Default nsprMode == PR_RDONLY*/
/*Default accessmode = 0666 (octal)*/)
// Factory method to get an nsInputStream from a file, using most common options
//----------------------------------------------------------------------------------------
{
// This QueryInterface was needed because NS_NewIOFileStream
// does a cast from (void *) to (nsISupports *) thus causing a
// vtable problem on Windows, where we really didn't have the proper pointer
// to an nsIInputStream, this ensures that we do
nsISupports * supports;
nsIInputStream * inStr;
nsresult rv = NS_NewIOFileStream(&supports, inFile, PR_RDONLY, 0666);
*aResult = nsnull;
if (NS_SUCCEEDED(rv)) {
if (NS_SUCCEEDED(supports->QueryInterface(NS_GET_IID(nsIInputStream), (void**)&inStr))) {
*aResult = inStr;
}
NS_RELEASE(supports);
}
return rv;
}
//----------------------------------------------------------------------------------------
nsresult NS_NewTypicalOutputFileStream(
nsISupports** aResult,
const nsFileSpec& inFile
/*default nsprMode= (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE)*/
/*Default accessMode= 0666 (octal)*/)
// Factory method to get an nsOutputStream to a file - most common case.
//----------------------------------------------------------------------------------------
{
// This QueryInterface was needed because NS_NewIOFileStream
// does a cast from (void *) to (nsISupports *) thus causing a
// vtable problem on Windows, where we really didn't have the proper pointer
// to an nsIOutputStream, this ensures that we do
#if 1
/* nsISupports * supports;
nsIOutputStream * outStr;
nsresult rv = NS_NewIOFileStream(
&supports,
inFile,
(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
0666);
*aResult = nsnull;
if (NS_SUCCEEDED(rv)) {
if (NS_SUCCEEDED(supports->QueryInterface(NS_GET_IID(nsIOutputStream), (void**)&outStr))) {
*aResult = outStr;
}
NS_RELEASE(supports);
}
return rv;
*/
nsCOMPtr<nsISupports> supports;
nsIOutputStream * outStr;
nsresult rv = NS_NewIOFileStream(
getter_AddRefs(supports),
inFile,
(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
0666);
*aResult = nsnull;
if (NS_SUCCEEDED(rv)) {
if (NS_SUCCEEDED(supports->QueryInterface(NS_GET_IID(nsIOutputStream), (void**)&outStr))) {
*aResult = outStr;
}
}
return rv;
#else
return NS_NewIOFileStream(
aResult,
inFile,
(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
0666);
#endif
}
//----------------------------------------------------------------------------------------
NS_COM nsresult NS_NewIOFileStream(
nsISupports** aResult,
const nsFileSpec& inFile,
PRInt32 nsprMode /*default = (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE)*/,
PRInt32 accessMode /*Default = 0666 (octal)*/)
// Factory method to get an object that implements both nsIInputStream
// and nsIOutputStream, associated with a file.
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aResult != nsnull, "null ptr");
if (!aResult)
return NS_ERROR_NULL_POINTER;
FileImpl* stream = new FileImpl(inFile, nsprMode, accessMode);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
else
{
PRBool isOpened = PR_FALSE;
stream->GetIsOpen(&isOpened);
if (!isOpened)
{
delete stream;
return NS_ERROR_FAILURE;
}
}
NS_ADDREF(stream);
*aResult = (nsISupports*)(void*)stream;
return NS_OK;
}
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