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75 lines
2.7 KiB
Plaintext
75 lines
2.7 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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nsresult
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NS_NewStorageStream(PRUint32 segmentSize, PRUint32 maxSize, nsIStorageStream **result);
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%}
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