| 1 | /* ***** BEGIN LICENSE BLOCK *****
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| 2 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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| 3 | *
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| 4 | * The contents of this file are subject to the Mozilla Public License Version
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| 5 | * 1.1 (the "License"); you may not use this file except in compliance with
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| 6 | * the License. You may obtain a copy of the License at
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| 7 | * http://www.mozilla.org/MPL/
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| 8 | *
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| 9 | * Software distributed under the License is distributed on an "AS IS" basis,
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| 10 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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| 11 | * for the specific language governing rights and limitations under the
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| 12 | * License.
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| 13 | *
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| 14 | * The Original Code is Mozilla.
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| 15 | *
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| 16 | * The Initial Developer of the Original Code is
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| 17 | * Netscape Communications Corporation.
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| 18 | * Portions created by the Initial Developer are Copyright (C) 2002
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| 19 | * the Initial Developer. All Rights Reserved.
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| 20 | *
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| 21 | * Contributor(s):
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| 22 | * Darin Fisher <darin@netscape.com>
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| 23 | *
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| 24 | * Alternatively, the contents of this file may be used under the terms of
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| 25 | * either the GNU General Public License Version 2 or later (the "GPL"), or
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| 26 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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| 27 | * in which case the provisions of the GPL or the LGPL are applicable instead
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| 28 | * of those above. If you wish to allow use of your version of this file only
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| 29 | * under the terms of either the GPL or the LGPL, and not to allow others to
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| 30 | * use your version of this file under the terms of the MPL, indicate your
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| 31 | * decision by deleting the provisions above and replace them with the notice
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| 32 | * and other provisions required by the GPL or the LGPL. If you do not delete
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| 33 | * the provisions above, a recipient may use your version of this file under
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| 34 | * the terms of any one of the MPL, the GPL or the LGPL.
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| 35 | *
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| 36 | * ***** END LICENSE BLOCK ***** */
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| 37 |
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| 38 | #ifndef nsStreamUtils_h__
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| 39 | #define nsStreamUtils_h__
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| 40 |
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| 41 | #include "nscore.h"
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| 42 |
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| 43 | class nsIInputStream;
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| 44 | class nsIOutputStream;
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| 45 | class nsIInputStreamCallback;
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| 46 | class nsIOutputStreamCallback;
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| 47 | class nsIEventTarget;
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| 48 |
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| 49 | /**
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| 50 | * A "one-shot" proxy of the OnInputStreamReady callback. The resulting
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| 51 | * proxy object's OnInputStreamReady function may only be called once! The
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| 52 | * proxy object ensures that the real notify object will be free'd on the
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| 53 | * thread corresponding to the given event target regardless of what thread
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| 54 | * the proxy object is destroyed on.
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| 55 | *
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| 56 | * This function is designed to be used to implement AsyncWait when the
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| 57 | * aEventTarget parameter is non-null.
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| 58 | */
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| 59 | extern NS_COM nsresult
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| 60 | NS_NewInputStreamReadyEvent(nsIInputStreamCallback **aEvent,
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| 61 | nsIInputStreamCallback *aNotify,
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| 62 | nsIEventTarget *aEventTarget);
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| 63 |
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| 64 | /**
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| 65 | * A "one-shot" proxy of the OnOutputStreamReady callback. The resulting
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| 66 | * proxy object's OnOutputStreamReady function may only be called once! The
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| 67 | * proxy object ensures that the real notify object will be free'd on the
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| 68 | * thread corresponding to the given event target regardless of what thread
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| 69 | * the proxy object is destroyed on.
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| 70 | *
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| 71 | * This function is designed to be used to implement AsyncWait when the
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| 72 | * aEventTarget parameter is non-null.
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| 73 | */
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| 74 | extern NS_COM nsresult
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| 75 | NS_NewOutputStreamReadyEvent(nsIOutputStreamCallback **aEvent,
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| 76 | nsIOutputStreamCallback *aNotify,
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| 77 | nsIEventTarget *aEventTarget);
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| 78 |
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| 79 | /* ------------------------------------------------------------------------- */
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| 80 |
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| 81 | enum nsAsyncCopyMode {
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| 82 | NS_ASYNCCOPY_VIA_READSEGMENTS,
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| 83 | NS_ASYNCCOPY_VIA_WRITESEGMENTS
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| 84 | };
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| 85 |
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| 86 | /**
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| 87 | * This function is called when the async copy process completes. The reported
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| 88 | * status is NS_OK on success and some error code on failure.
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| 89 | */
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| 90 | typedef void (* nsAsyncCopyCallbackFun)(void *closure, nsresult status);
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| 91 |
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| 92 | /**
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| 93 | * This function asynchronously copies data from the source to the sink. All
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| 94 | * data transfer occurs on the thread corresponding to the given event target.
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| 95 | * A null event target is not permitted.
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| 96 | *
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| 97 | * The copier handles blocking or non-blocking streams transparently. If a
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| 98 | * stream operation returns NS_BASE_STREAM_WOULD_BLOCK, then the stream will
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| 99 | * be QI'd to nsIAsync{In,Out}putStream and its AsyncWait method will be used
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| 100 | * to determine when to resume copying.
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| 101 | */
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| 102 | extern NS_COM nsresult
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| 103 | NS_AsyncCopy(nsIInputStream *aSource,
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| 104 | nsIOutputStream *aSink,
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| 105 | nsIEventTarget *aEventTarget,
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| 106 | nsAsyncCopyMode aMode = NS_ASYNCCOPY_VIA_READSEGMENTS,
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| 107 | PRUint32 aChunkSize = 4096,
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| 108 | nsAsyncCopyCallbackFun aCallbackFun = nsnull,
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| 109 | void *aCallbackClosure = nsnull);
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| 110 |
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| 111 | #endif // !nsStreamUtils_h__
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