gecko/dom/indexedDB/nsIStandardFileStream.idl
2012-06-03 18:33:52 +02:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 nsIFile;
/**
* A stream that allows you to read from a file or stream to a file
* using standard file APIs.
*/
[scriptable, uuid(ebbbb779-92a3-4b2a-b7cf-6efbe904c453)]
interface nsIStandardFileStream : nsISupports
{
/**
* If this is set, the file will be opened (i.e., a call to
* fopen done) only when we do an actual operation on the stream,
* or more specifically, when one of the following is called:
* - Seek
* - Tell
* - SetEOF
* - Available
* - Read
* - Write
* - Flush
* - GetSize
* - GetLastModified
* - Sync
*
* FLAGS_DEFER_OPEN is useful if we use the stream on a background
* thread, so that the opening and possible |stat|ing of the file
* happens there as well.
*
* @note Using this flag results in the file not being opened
* during the call to Init. This means that any errors that might
* happen when this flag is not set would happen during the
* first read. Also, the file is not locked when Init is called,
* so it might be deleted before we try to read from it.
*/
const long FLAGS_DEFER_OPEN = 1 << 0;
/**
* @param file file to read from or stream to
* @param mode file open mode (see fopen documentation)
* @param flags flags specifying various behaviors of the class
* (see enumerations in the class)
*/
void init(in nsIFile file,
in AString mode,
in long flags);
/**
* Flush all written content held in memory buffers out to disk.
* This is the equivalent of fflush()
*/
void flushBuffers();
};