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