gecko-dev/xpcom/io/nsPipe2.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIPipe2_h___
#define nsIPipe2_h___
#include "nsIBufferInputStream.h"
#include "nsIBufferOutputStream.h"
#define NS_IPIPEOBSERVER_IID \
{ /* 3c87cec0-4e28-11d3-9369-00104ba0fd40 */ \
0x3c87cec0, \
0x4e28, \
0x11d3, \
{0x93, 0x69, 0x00, 0x10, 0x4b, 0xa0, 0xfd, 0x40} \
}
class nsIPipeObserver : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IPIPEOBSERVER_IID);
NS_IMETHOD OnFull() = 0;
NS_IMETHOD OnWrite(PRUint32 amount) = 0;
NS_IMETHOD OnEmpty() = 0;
};
#if 0
/**
* The signature for the reader function passed to WriteSegment. This
* specifies where the data should come from that gets written into the buffer.
* Implementers should return the following:
* @return NS_OK and readCount > 0 - if successfully read something
* @return NS_OK and readCount == 0 - if no more to read (EOF)
* @return NS_BASE_STREAM_WOULD_BLOCK - if there is currently no data (in
* a non-blocking mode)
* @return <other-error> - on failure
*/
typedef NS_CALLBACK(nsReadSegmentFun)(void* closure,
char* toRawSegment,
PRUint32 fromOffset,
PRUint32 count,
PRUint32 *readCount);
/**
* The signature of the writer function passed to ReadSegments. This
* specifies where the data should go that gets read from the buffer.
* Implementers should return the following:
* @return NS_OK and writeCount - if successfully wrote something
* @return NS_BASE_STREAM_CLOSED - if no more can be written
* @return NS_BASE_STREAM_WOULD_BLOCK - if there is currently space to write (in
* a non-blocking mode)
* @return <other-error> - on failure
*/
typedef NS_CALLBACK(nsWriteSegmentFun)(void* closure,
const char* fromRawSegment,
PRUint32 toOffset,
PRUint32 count,
PRUint32 *writeCount);
#endif
#define NS_PIPE_DEFAULT_SEGMENT_SIZE 4096
#define NS_PIPE_DEFAULT_BUFFER_SIZE (1024*1024)
extern NS_COM nsresult
NS_NewPipe(nsIBufferInputStream* *inStrResult,
nsIBufferOutputStream* *outStrResult,
nsIPipeObserver* observer = nsnull,
PRUint32 segmentSize = NS_PIPE_DEFAULT_SEGMENT_SIZE,
PRUint32 maxSize = NS_PIPE_DEFAULT_BUFFER_SIZE);
////////////////////////////////////////////////////////////////////////////////
#endif // nsIPipe2_h___