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+/* -*- 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);
+%}