xpcom/io/nsIStorageStream.idl
author L10n Bumper Bot <release+l10nbumper@mozilla.com>
Thu, 08 Nov 2018 03:00:11 -0800
changeset 501100 1cd4f2d571554c4dc89cf1be1d98683c0d14f797
parent 176988 d48fc2819410b0fdb21bf2fb08101c0c7e0071ef
child 538050 020c8c871c0d3b3920fe95935cfef06501976c0f
permissions -rw-r--r--
no bug - Bumping Fennec l10n changesets r=release a=l10n-bump DONTBUILD an -> 336e061995b9 ar -> f6834a7d7374 as -> d2c76e616a66 ast -> fcb8f3455237 az -> c4caf3b07cf2 be -> 697eb1022498 bg -> 7bf1f448f743 bn-BD -> 5f7a87adee06 bn-IN -> 49ce3195c4c2 br -> 41cf35b7c5b5 bs -> 4a14aee27904 ca -> 9373e8ce86d4 cak -> a40d767541ba cs -> 4b99defb0525 cy -> 4c948fed2584 de -> 017a7e7a267a dsb -> aadebeccf5ba el -> 2d28a78dcef5 en-CA -> 55ad9171a9f0 en-GB -> 296422b495e9 en-ZA -> c1b5d2128914 eo -> c68e87667d9f es-AR -> bff0a788c711 es-CL -> 1d3efd2532ea es-ES -> 4d1feb70b0e2 es-MX -> fceda607d0f4 et -> 58a8262a0cc7 eu -> 7cebfd46208b fa -> cbc040d58476 ff -> 46f5aec275ea fi -> 235ab13d261e fr -> 8ee417b64f99

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

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(44a200fe-6c2b-4b41-b4e3-63e8c14e7c0d)]
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 UINT32_MAX is safe.
     */
    void init(in uint32_t segmentSize, in uint32_t maxSize);

    /**
     * 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 int32_t 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 int32_t 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 uint32_t length;

    /**
     * True, when output stream has not yet been Close'ed
     */
    readonly attribute boolean writeInProgress;
};

%{C++
// Factory method
nsresult
NS_NewStorageStream(uint32_t segmentSize, uint32_t maxSize, nsIStorageStream **result);
%}