mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 06:05:44 +00:00
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 -*-
|
|
* ***** 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);
|
|
%}
|