gecko-dev/xpcom/ds/nsIByteBuffer.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIByteBuffer_h___
#define nsIByteBuffer_h___
#include "nscore.h"
#include "nsISupports.h"
class nsIInputStream;
#define NS_IBYTE_BUFFER_IID \
{ 0xe4a6e4b0, 0x93b4, 0x11d1, \
{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
/** Interface to a buffer that holds bytes */
class nsIByteBuffer : public nsISupports {
public:
/** @return length of buffer, i.e. how many bytes are currently in it. */
virtual PRInt32 GetLength() const = 0;
/** @return number of bytes allocated in the buffer */
virtual PRInt32 GetBufferSize() const = 0;
/** @return the buffer */
virtual char* GetBuffer() const = 0;
/** Grow buffer to aNewSize bytes. */
virtual PRBool Grow(PRInt32 aNewSize) = 0;
/** Fill the buffer with data from aStream. Don't grow the buffer, only
* read until length of buffer equals buffer size. */
virtual PRInt32 Fill(nsresult* aErrorCode, nsIInputStream* aStream,
PRInt32 aKeep) = 0;
};
/** Create a new byte buffer using the given buffer size. */
extern NS_BASE nsresult NS_NewByteBuffer(nsIByteBuffer** aInstancePtrResult,
nsISupports* aOuter,
PRInt32 aBufferSize = 0);
#endif /* nsIByteBuffer_h___ */