gecko-dev/xpcom/io/nsIScriptableBase64Encoder.idl

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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;

/**
 * nsIScriptableBase64Encoder efficiently encodes the contents
 * of a nsIInputStream to a Base64 string.  This avoids the need
 * to read the entire stream into a buffer, and only then do the
 * Base64 encoding.
 *
 *  If you already have a buffer full of data, you should use
 *  btoa instead!
 */
[scriptable, uuid(9479c864-d1f9-45ab-b7b9-28b907bd2ba9)]
interface nsIScriptableBase64Encoder : nsISupports
{
  /**
   *  These methods take an nsIInputStream and return a narrow or wide
   *  string with the contents of the nsIInputStream base64 encoded.
   *
   *  The stream passed in must support ReadSegments and must not be
   *  a non-blocking stream that will return NS_BASE_STREAM_WOULD_BLOCK.
   *  If either of these restrictions are violated we will abort.
   */
  ACString encodeToCString(in nsIInputStream stream, in unsigned long length);
  AString encodeToString(in nsIInputStream stream, in unsigned long length);
};