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- /* ***** 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.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 2002
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Darin Fisher <darin@netscape.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either 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 ***** */
-
- #ifndef nsStreamUtils_h__
- #define nsStreamUtils_h__
-
- #include "nscore.h"
-
- class nsIInputStream;
- class nsIOutputStream;
- class nsIInputStreamCallback;
- class nsIOutputStreamCallback;
- class nsIEventTarget;
-
- /**
- * A "one-shot" proxy of the OnInputStreamReady callback. The resulting
- * proxy object's OnInputStreamReady function may only be called once! The
- * proxy object ensures that the real notify object will be free'd on the
- * thread corresponding to the given event target regardless of what thread
- * the proxy object is destroyed on.
- *
- * This function is designed to be used to implement AsyncWait when the
- * aEventTarget parameter is non-null.
- */
- extern NS_COM nsresult
- NS_NewInputStreamReadyEvent(nsIInputStreamCallback **aEvent,
- nsIInputStreamCallback *aNotify,
- nsIEventTarget *aEventTarget);
-
- /**
- * A "one-shot" proxy of the OnOutputStreamReady callback. The resulting
- * proxy object's OnOutputStreamReady function may only be called once! The
- * proxy object ensures that the real notify object will be free'd on the
- * thread corresponding to the given event target regardless of what thread
- * the proxy object is destroyed on.
- *
- * This function is designed to be used to implement AsyncWait when the
- * aEventTarget parameter is non-null.
- */
- extern NS_COM nsresult
- NS_NewOutputStreamReadyEvent(nsIOutputStreamCallback **aEvent,
- nsIOutputStreamCallback *aNotify,
- nsIEventTarget *aEventTarget);
-
- /* ------------------------------------------------------------------------- */
-
- enum nsAsyncCopyMode {
- NS_ASYNCCOPY_VIA_READSEGMENTS,
- NS_ASYNCCOPY_VIA_WRITESEGMENTS
- };
-
- /**
- * This function is called when the async copy process completes. The reported
- * status is NS_OK on success and some error code on failure.
- */
- typedef void (* nsAsyncCopyCallbackFun)(void *closure, nsresult status);
-
- /**
- * This function asynchronously copies data from the source to the sink. All
- * data transfer occurs on the thread corresponding to the given event target.
- * A null event target is not permitted.
- *
- * The copier handles blocking or non-blocking streams transparently. If a
- * stream operation returns NS_BASE_STREAM_WOULD_BLOCK, then the stream will
- * be QI'd to nsIAsync{In,Out}putStream and its AsyncWait method will be used
- * to determine when to resume copying.
- */
- extern NS_COM nsresult
- NS_AsyncCopy(nsIInputStream *aSource,
- nsIOutputStream *aSink,
- nsIEventTarget *aEventTarget,
- nsAsyncCopyMode aMode = NS_ASYNCCOPY_VIA_READSEGMENTS,
- PRUint32 aChunkSize = 4096,
- nsAsyncCopyCallbackFun aCallbackFun = nsnull,
- void *aCallbackClosure = nsnull);
-
- /**
- * This function tests whether or not the input stream is buffered. A buffered
- * input stream is one that implements readSegments. The test for this is to
- * simply call readSegments, without actually consuming any data from the
- * stream, to verify that it functions.
- *
- * NOTE: If the stream is non-blocking and has no data available yet, then this
- * test will fail. In that case, we return false even though the test is not
- * really conclusive.
- *
- * @param aInputStream
- * The input stream to test.
- */
- extern NS_COM PRBool
- NS_InputStreamIsBuffered(nsIInputStream *aInputStream);
-
- /**
- * This function tests whether or not the output stream is buffered. A
- * buffered output stream is one that implements writeSegments. The test for
- * this is to simply call writeSegments, without actually writing any data into
- * the stream, to verify that it functions.
- *
- * NOTE: If the stream is non-blocking and has no available space yet, then
- * this test will fail. In that case, we return false even though the test is
- * not really conclusive.
- *
- * @param aOutputStream
- * The output stream to test.
- */
- extern NS_COM PRBool
- NS_OutputStreamIsBuffered(nsIOutputStream *aOutputStream);
-
- #endif // !nsStreamUtils_h__
-