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- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla 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/MPL/
- *
- * 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 Communicator client code, released
- * March 31, 1998.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998-1999
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of 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 MPL, 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 MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #include "nsISupports.idl"
- #include "nsrootidl.idl"
-
- interface nsIMemory;
- interface nsIInputStream;
- interface nsIOutputStream;
-
- /**
- * The nsIStorageStream interface maintains an internal data buffer that can be
- * filled using a single output stream. One or more independent input streams
- * can be created to read the data from the buffer non-destructively.
- */
-
- [scriptable, uuid(604ad9d0-753e-11d3-90ca-34278643278f)]
- interface nsIStorageStream : nsISupports
- {
- /**
- *
- * Initialize the stream, setting up the amount of space that will be
- * allocated for the stream's backing-store.
- *
- * @param segmentSize
- * Size of each segment. Must be a power of two.
- * @param maxSize
- * Maximum total size of this stream. length will always be less
- * than or equal to this value. Passing PR_UINT32_MAX is safe.
- * @param segmentAllocator
- * Which allocator to use for the segments. May be null, in which
- * case a default allocator will be used.
- */
- void init(in PRUint32 segmentSize, in PRUint32 maxSize, in nsIMemory segmentAllocator);
-
- /**
- * Get a reference to the one and only output stream for this instance.
- * The zero-based startPosition argument is used is used to set the initial
- * write cursor position. The startPosition cannot be set larger than the
- * current buffer length. Calling this method has the side-effect of
- * truncating the internal buffer to startPosition bytes.
- */
- nsIOutputStream getOutputStream(in PRInt32 startPosition);
-
- /**
- * Create a new input stream to read data (written by the singleton output
- * stream) from the internal buffer. Multiple, independent input streams
- * can be created.
- */
- nsIInputStream newInputStream(in PRInt32 startPosition);
-
- /**
- * The length attribute indicates the total number of bytes stored in the
- * nsIStorageStream internal buffer, regardless of any consumption by input
- * streams. Assigning to the length field can be used to truncate the
- * buffer data, but can not be used when either the instance's output
- * stream is in use.
- *
- * @See #writeInProgress */
- attribute PRUint32 length;
-
- /**
- * True, when output stream has not yet been Close'ed
- */
- readonly attribute boolean writeInProgress;
- };
-
- %{C++
- // Factory method
- NS_COM nsresult
- NS_NewStorageStream(PRUint32 segmentSize, PRUint32 maxSize, nsIStorageStream **result);
- %}
-